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{id=62877829790, createdAt=1640878956493, updatedAt=1677791531713, path='penn-7-cdf-wetlands-restoration', name='Penn 7 CDF Wetlands Restoration', 1='{type=string, value=Penn 7 CDF Wetlands Restoration}', 4='{type=string, value=Learn how the City of Toledo, Ohio used available grants to restore a former confined disposal facility to improve water quality and ecosystem health}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}, {id=19, name='Government', order=4, label='Government'}]}', 8='{type=string, value=
The lower Maumee River hosts the largest fish spawning migrations of any Great Lakes tributary. Floodplain wetland habitat is essential for healthy fish communities and for wildlife that depend on wetlands at some point during their life cycle. Floodplain wetland habitat on the lower Maumee River is almost non-existent due to filling, channelization, and shoreline hardening activities completed over the last century, including at the Penn 7 former confined disposal facility (CDF) where dredged materials from the Maumee River shipping channel were placed in the late 1960s – early 1970s.
To explore the opportunity to create wetland and improved fish and wildlife habitat at the Penn 7 CDF located along the Maumee River near its mouth into Lake Erie, the City of Toledo received a Great Lakes Restoration Initiative (GLRI) grant from the National Oceanic and Atmospheric Administration (NOAA). This grant funded site characterization activities and a feasibility study to determine the restoration potential of Penn 7. Working closely with the City and involved agencies, Verdantas helped prepare the successful NOAA grant application and was later contracted with the City to complete the feasibility study. The study resulted in the determination that the historically placed sediment in the CDF were no more impacted than the surrounding Maumee River sediments and that the property was suitable for restoration.
The City subsequently received GLRI funding through the NOAA-Great Lakes Commission Regional Habitat Partnership for final engineering, design, permitting, construction, and public involvement activities. The GLRI program funds were dedicated to this project as part of the Maumee AOC Management Action Project to address the Wildlife Beneficial Use Impairment. The City contracted with Verdantas and Geo. Gradel Co. to complete these activities. The engaged project management team also included Ohio EPA and the ODNR Division of Wildlife. Plans were finalized in summer 2020 and primary construction activities were finished in summer 2021.
Work Completed
To connect the upstream portion of the site with the Maumee River, a water control and fish passage structure was installed within the existing CDF dike. To allow river water to flow to and through the new wetland habitat, sediment was excavated and recontoured in the upstream portion of the site. A channel was excavated to connect the new upstream wetland to the downstream end of the property where an existing embayment is located. To protect/enhance the embayment, a dike with a water control and fish passage structure was installed between it and the Maumee River.
This project created approximately 9.5 acres of submerged and emergent wetlands on the former CDF, 8.5 acres of protected coastal wetlands/open water habitat in the embayment, and 20+ acres of improved upland habitat. This property is expected to be a productive spawning and nursery site for Lake Erie and Maumee River fish and provide quality benthic and wildlife habitat while reducing suspended sediments/nutrient concentrations of river water flowing into the restored habitat. Our work also included significant community and stakeholder outreach activities.
}', 13='{type=image, value=Image{width=1600,height=819,url='https://www.verdantas.com/hubfs/Projects/Penn7/Photo%206%20-%20Restoration%20Post-Construction-1.jpeg',altText=''}}', 14='{type=string, value=The project improved habitat for fish and wildlife by creating coastal wetlands and forested area along the Maumee River. This urban nature space will improve water quality and ecosystem health while promoting eco-tourism, birding, and fishing.}', 15='{type=image, value=Image{width=922,height=691,url='https://www.verdantas.com/hubfs/Projects/Penn7/Photo%201%20Pre-Construction.jpg',altText=''}}', 16='{type=string, value=The 59-acre Penn 7 property along the Maumee River is a former confined disposal facility that accepted dredged material from the Maumee River shipping channel until the 1970s. This section of the river has miles of hardened shorelines and Penn 7 had low quality wetlands that were isolated from the river.}', 17='{type=image, value=Image{width=4032,height=3024,url='https://www.verdantas.com/hubfs/Projects/Penn7/Photo%204%20-%20Embayment%20Construction.jpg',altText=''}}', 18='{type=string, value=A Great Lakes Restoration Initiative award through NOAA and the Great Lakes Commission Regional Partnership restored seven acres of coastal wetland habitat, created eight acres of embayment area, added 1,000 feet of fish passage channel, and incorporated 15 acres of native plantings.}', 19='{type=image, value=Image{width=836,height=627,url='https://www.verdantas.com/hubfs/Projects/Penn7/Photo%203%20-%20Channel%20Construction.jpg',altText=''}}', 20='{type=string, value=A modified channel connects the new wetland to created habitat features within the enhanced embayment area. A new water control structure within the existing dike connects the site to the Maumee River and provides fish passage. Excavation and recontouring of dredged sediments allow river water to flow through the new wetland habitat.}', 21='{type=image, value=Image{width=836,height=627,url='https://www.verdantas.com/hubfs/Projects/Penn7/Wetland%202.jpg',altText=''}}', 22='{type=string, value=Restoration provides quality spawning and nursery space for over 40 species of Lake Erie fish as well as quality habitat for native birds, amphibians, reptiles, mammals, and river bottom communities.}', 23='{type=image, value=Image{width=1600,height=1200,url='https://www.verdantas.com/hubfs/Projects/Penn7/Photo%205%20-%20Dike%20Construction-1.jpg',altText=''}}', 24='{type=string, value=Managing client and agency input and expectations including NOAA, U.S. EPA Region 5, USGS, Ohio EPA, ODNR Division of Wildlife, and others added to project complexity. A robust community outreach program kept stakeholders engaged.}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=1}', 30='{type=string, value=
{id=112278459705, createdAt=1682097216886, updatedAt=1682517903656, path='south-valley-parkway', name='South Valley Parkway Roadway', 1='{type=string, value=South Valley Parkway}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=13, name='Site and Roadway Civil Engineering', order=7, label='Site and Roadway Civil Engineering'}]}', 35='{type=string, value=Pennsylvania Department of Transportation, Engineering District 4-0}', 4='{type=string, value=Read how a team approach helped to create safer driving conditions and reduced traffic burdens with this PennDOT project}', 36='{type=string, value=Hanover Township/City of Nanticoke, Luzerne County, PA}', 5='{type=list, value=[{id=20, name='Transportation', order=5, label='Transportation'}]}', 8='{type=string, value=
The South Valley Parkway Project has provided a solution to concerns of residents along Middle Road regarding the compromised vehicular and pedestrian safety along this narrow corridor due to significant increase in traffic over the years.
The overall project is comprised of a new roadway alignment totaling 2.5 miles, one split interchange, five single lane roundabouts and one double lane roundabout to the South Valley Region in lower Luzerne County, PA. The project included the construction of a six-span two-lane bridge, carrying the parkway over Nanticoke Creek, Dundee Road and State Route 29, a single span two-lane bridge, carrying Main Street over State Route 29, and seventeen stormwater management basins which facilitated the separation of onsite stormwater and offsite watercourses to the highest standard. Safety and traffic congestion were the driving forces for PennDOT Engineering District 4-0’s purpose and need to move forward with the project. In addition, the project utilized what was otherwise abandoned coal land and transformed it into a viable traffic calming solution for the surrounding community. The new parkway connects Hanover Township with the City of Nanticoke, alleviating congestion to the residents along State Route 2008 (Middle Road) due to the commuters to Luzerne County Community College Campus and now restricted truck traffic.
Our team was the prime design consultant for this project completing Preliminary Engineering, Final Design, and Consultation during construction on behalf of the project owner PennDOT Engineering District 4-0.
Project Features:
Selecting alignment of 2.5-mile new roadway while minimizing impacts and cost containment to fall within allotted funding.
Excavation = 1.4M cubic yards, Rock blasting
Six (6) Roundabouts - Five (5) Single Lane, and One (1) Double Lane
Six (6) Span Concrete Bridge, One (1) Single-Span Concrete Bridge
One (1) Box Culvert
Four (4) Rock Structure Habitat created for Eastern Small-Footed Myotis Bats
Seventeen (17) Storm Water Management Basins
(2) Utility Main Relocations
Acid Bearing Rock (ABR) – rock containing the sulfide-bearing mineral pyrite represents a potential source of Acid Rock Drainage (ARD). As a result, the construction specification required to minimize exposure to air and water without being covered to 5 days, and required an ABR disposal at the project’s approved waste site.
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Verdantas served as lead designer on the Design-Build team for Cleveland Metroparks for the Bonnie Park Ecological Restoration and Site Improvement Project located at Mill Stream Run Reservation in Strongsville. Our team designed, permitted, and performed construction and planting for the Metroparks project. Work was funded by the Ohio EPA Water Resource Restoration Sponsor Program (WRRSP).
Project goals were to complete river restoration and floodplain reconnection through the removal of a historic lowhead mill dam located in-line with the East Branch of the Rocky River (EBRR). The objective of this goal was to restore the Warmwater Habitat (WWH) status of the EBRR by improving sediment transport, fish migration and colonization. The lowhead dam was a migration barrier for fish and promoted sedimentation that negatively affected the macroinvertebrate populations within the stream corridor.
To achieve these goals, the restoration design included removal of the dam and establishment of natural stream profile and pattern by incorporating boulder riffle and pools through the previously impounded river area and through the demolished dam area. The stream banks of the EBRR were restored through the establishment of floodplain bankfull benches by removing existing gabion baskets and the grading of eroded banks. An existing undersized culvert under the main entrance’s road running across the floodplain was replaced with a large 3-sided culvert to provide floodplain connectivity to wetlands within the EBRR floodplain. The restoration also includes the creation of floodplain upstream of the dam in an existing mowed field and the restoration of two to three acres of wetland habitat in a former baseball field within the EBRR floodplain. Invasive species were removed within the limits of the project work including removal of invasive shrubs, trees, and herbaceous plants.
Substantial construction was completed in fall 2020 and planting was completed in winter/spring of 2021.
Chronolog Timelapse
The Metroparks set up a ChronoLog for the project—a timelapse of the site, made up of photos from visitors, compiled since 2020. View the Chronolog
}', 13='{type=image, value=Image{width=2000,height=1000,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Bonnie-Park-Completed-Restoration.jpeg',altText=''}}', 14='{type=string, value=River restoration and floodplain reconnection was completed following removal of a historic lowhead mill dam.}', 15='{type=image, value=Image{width=1200,height=900,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Bonnie-Park-Before-Dam-Removal.jpg',altText=''}}', 16='{type=string, value=The lowhead dam was a migration barrier for fish and promoted sedimentation that negatively affected the macroinvertebrate populations within the stream corridor.}', 17='{type=image, value=Image{width=2000,height=1000,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Bonnie-Park-During-Dam-Removal.jpeg',altText=''}}', 18='{type=string, value=The restoration design included design, permitting, construction and planting to establish a natural stream profile.}', 19='{type=image, value=Image{width=1200,height=675,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Bonnie-Park-Flood-Plain-During-Restoration.jpg',altText=''}}', 20='{type=string, value=A floodplain was created upstream of the mill dam.}', 21='{type=image, value=Image{width=1200,height=900,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Bonnie-Park-Flood-Plain-Post-Renovation.jpg',altText=''}}', 22='{type=string, value=The restoration established several acres of wetland habitat.}', 23='{type=image, value=Image{width=1500,height=1125,url='https://www.verdantas.com/hubfs/Projects/Bonnie-Park-Restoration/Cleveland-Metro-Parks-Bonnie-Park-at-Ribbon-Cutting.jpg',altText=''}}', 24='{type=string, value=Invasive species were also removed as part of the project.}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=2}'}
{id=107714253069, createdAt=1679596186020, updatedAt=1679596918546, path='service-energy-spcc-plan', name='Service Energy SPCC Plan Development', 1='{type=string, value=Service Energy SPCC Plan Development}', 33='{type=number, value=1}', 34='{type=list, value=[{id=7, name='Environmental Health & Safety', order=1, label='Environmental Health & Safety'}]}', 35='{type=string, value=Service Energy}', 4='{type=string, value=Read how Verdantas developed easy to use and practical SPCC plans to comply with 40 CFR 112}', 36='{type=string, value=Dover, Milford, and Lewes, Delaware}', 5='{type=list, value=[{id=17, name='Industrial', order=2, label='Industrial'}]}', 37='{type=list, value=[{id=115, name='Oil Spill Prevention', order=66, label='Oil Spill Prevention'}]}', 8='{type=string, value=
Verdantas was selected to prepare Spill Prevention, Control and Countermeasure (SPCC) plans for Service Energy facilities in Dover, Milford, and Lewes, Delaware. The goal of the effort was to develop SPCC plans that would not only be compliant with 40 CFR 112, but also be easy to use and practical to implement.
Having prepared hundreds of SPCC plans in EPA Region 3, Verdantas had a history collaborating with EPA on similar projects. With confidence that our product would pass regulatory scrutiny, Verdantas proceeded to conduct site visits to obtain the information needed to develop plans for each of the sites. Site visits took approximately 1.5 hours to complete (typically between 1 and 3 hours are needed, depending on the complexity of the site). Following the site visits, information collected was carefully transformed into accurate, workable documents. Our client was given an opportunity to review draft documents before final plans, signed and sealed by a registered Professional Engineer (PE), were available for use.
The Verdantas team brings decades of superior experience with navigating compliance requirements related to oil pollution prevention. From federal Spill Prevention, Control and Countermeasure (SPCC) requirements to federal Facility Response Plan (FRP) requirements to individual state programs, our team has established career- long relationships with the regulators who implement these programs. This familiarity yields compliance success for our clients.
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Verdantas offers on-going support to a semiconductor manufacturing facility located in southern New Hampshire. This facility manufactures gallium arsenide wafers using a Metal-Organic Chemical Vapor Deposition (MOCVD) process. Due to the laboratory-style operations and hazardous gases and liquids involved, the facility requires on-going safety program management and staff involvement.
Employee Safety Committee
Verdantas leads the facility’s monthly safety committee meetings. Once per month, a selection of employees from upper managers to lab workers meet to discuss on-going safety needs and events. These meetings incorporate the review of near-miss reports, anticipated future events, and scheduling regular tasks such as facility safety walk-throughs and training. Quarterly, the team develops a report of safety events reviewed by the committee, which is distributed to all employees in the facility. Verdantas uses their combined experience to guide and direct the safety committee while allowing the attending members to exercise their agency in directing facility safety programs.
Employee Training
Verdantas provides both live training services to facility employees, as well as assisting facility staff in developing and presenting their own training classes. It is Verdantas’ approach to empower clients to manage and develop programs as much as possible to bolster facility staff engagement and develop positive long-term corporate environmental health and safety (EHS) habits.
Company Program Development
Verdantas offers ongoing support to assist the facility in developing internal safety programs, such as chemical spill response, lockout-tagout, facility safety inspections, and new chemical review forms / change management procedures. As with training, the goal is help prop up the facility’s programs currently in a manner allowing the facility to continue managing them in the future themselves as much as possible.
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Experts from our Somerville, New Jersey office serve as LSRP's on a waterfront historic fill site. The site was operated as a shipyard, naval yard, and ship decommissioning facility from the early 1900s through the 1980s, when it was developed as a multi-tenant industrial park. The property owner voluntarily requested an environmental review and clearance of the property during redevelopment.
A comprehensive investigation was completed including a Preliminary Assessment, Site Investigation, Remedial Investigation, Remedial Action Workplan, and Remedial Action Report. Several areas of concern requiring remediation were identified and excavated. Ground water was investigated, but did not require remediation. Site-wide historic fill evaluation was required to support import of alternative fill material. More than one hundred soil borings were installed and samples were collected to develop a statistically-robust alternative fill acceptance criteria. The fill acceptance criteria was approved by the New Jersey Department of Environmental Protection (NJDEP), and approximately 250,000 cubic yards of alternative fill were imported to support redevelopment. Our staff were key partners during redevelopment. Our role included quickly and carefully vetting potential fill sources, monitoring fill placement, advising on health and safety concerns, and supporting the construction team.
The property was successfully redeveloped for continued industrial usage, which required the successful navigation of a complex termination of a Declaration of Environmental Restrictions for several properties, and refiled a deed notice for the redevelopment site. The NJDEP issued a Soil Remedial Action Permit for the Site, and the Response Action Outcome was issued.
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{id=116339472256, createdAt=1684523166725, updatedAt=1684524653794, path='del-mar-bluffs', name='Del Mar Bluffs', 1='{type=string, value=Del Mar Bluffs}', 33='{type=number, value=1}', 34='{type=list, value=[{id=12, name='Geotechnical and Geological Engineering', order=6, label='Geotechnical and Geological Engineering'}]}', 35='{type=string, value=North County Transit District}', 4='{type=string, value=Read how geotechnical services kept the North County Transit District/Amtrak scenic route safe for riders.}', 36='{type=string, value=Del Mar, CA}', 37='{type=list, value=[{id=114, name='Geotechnical Engineering', order=65, label='Geotechnical Engineering'}, {id=117, name='Geotechnical Testing', order=68, label='Geotechnical Testing'}]}', 8='{type=string, value=
The North County Transit District/Amtrak route is a scenic one as it travels between the surf and coastal bluffs. Beautiful for the rider, unless the train is stopped due to the coastal bluff deterioration, slope failures and landslides that occurred adjacent to the railway, and prevented the trains from passing through.
In April 2001, a 40-foot section of concrete retaining wall collapsed, a wall that had lined the top of the Del Mar Bluffs at 7th Street. The failure, which had been identified in the completed Del Mar Bluffs Geotechnical Study as one of the highest risk areas, consisted of three wall sections approximately 60 feet above the beach.
To keep trains running atop the bluffs, the North County Transit District (NCTD), which owns the tracks, declared an emergency and approved spending $1,050,000 to design both immediate and long-term repairs to the portion that gave way. In addition, funding for mid-term measures, that could cost as much as $8.2 million on other high-risk portions of the bluff, were also approved. These measures are intended to ensure that the Amtrak and Coaster trains that run along the 1.6-mile-long section will be able to do so for the next 20 years.
In response to the emergency, our experts assessed the geological conditions and provided emergency repair alternatives for local agency review. With the selection of a shear-pin stabilization method, a “fast-track” analysis, the design and review period was successfully completed within 30 days. Construction of the stabilization system, twelve 60-foot-deep shear pins with tie-backs, was then successfully completed within 45 days.
Prior to this emergency, our geotechnical report had informed the NCTD that saturation from groundwater is/was the biggest problem facing Del Mar’s bluffs. The report predicts that, without reinforcing measures along at least half of their length, the bluffs will erode another 12 feet within the next 20 years, making them even more fragile. Specifically, our report had identified the area (at 7th Street) that failed as a high-risk zone.
The railroad tracks were first built along the bluffs in 1910. Because of population growth, runoff from irrigation has increased tremendously, saturating Del Mar’s bluffs with groundwater and causing them to erode faster than they otherwise would. (Leighton’s study showed that normal rainfall in the San Diego County would dump about 10 inches on Del Mar Bluffs, but with the increased runoff, water reaching the bluffs each year is equivalent to between 100 and 200 inches of rain.)
Improvements constructed included additional shear pins, soil cement improvements, sea walls at the base of the bluffs, reinforcing the bluffs, and improving surface and sub-surface drainage, all with site aesthetics as a key element.
The selected stabilization method included additional shear pins connected at the top by a reinforced grade beam with tie backs. Where improvements are exposed they have been boulder-scaped to match the adjacent bluffs. Site stabilization also included the installation of a deep cut off subdrain which was outletted by boring through the bluff to the beach below and exiting through a boulder-scaped outlet.
Leighton has continued to provide geotechnical services since that first report, including the Thanksgiving 2019 failure.
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The Port’s planned $1 billion dollars investment in capital improvements will ensure its continued ability to provide superior cargo terminals and rail and warehouse infrastructure, as well as attract top business tenants from around the world. As each capital project is planned, potential hazardous materials are addressed.
Our team has completed 20 project directives under a multi-year on call contract with the Port. Various regulatory agencies can be engaged in each directive such as Los Angeles Regional Water Quality Control Board, US EPA, Department of Toxic Substances, and Los Angeles County Fire Department.
It is our expert's role to provide the Port screening reports, produce and implement remediation workplans, monitor compliance of soil management plans, and communicate their position to other Port divisions.
Three work orders to provide construction monitoring have been completed. For one, within the Kopper’s area for the Berth 200 Project, we provided soil and air monitoring services and ensured that all elements of the Port’s Waste Management Plan (WMP), Soil Management Plan (SMP), Sampling and Analysis Plan (SAP), and Health and Safety Plan (HASP) were implemented by the various contractors. Leighton also sampled the stockpiles generated during the construction activities and assisted the Port to characterize, profile, and dispose the impacted soil and groundwater that was generated during the construction activities.
The Berth 200 Rail Yard switching and classification yard is used by Union Pacific Railroad, Burlington Northern Santa Fe Railroad Railway, and Pacific Harbor Line Railroad.
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The Goldstone Deep Space Communications Complex, located in the Mojave Desert, is the site for the Mars Deep Space Station 14 (DSS 14) a 229 foot diameter antenna that tracks spacecraft. Its most eye-catching element is its parabolic dish, weighing nearly 4,000,000 pounds. For the STEM minded, tours are available through the Goldstone website: www.gdscc.nasa.gov.
Repairs to the hydrostatic bearing supporting the antenna, required lifting the dish raising it and then dropping it down onto three temporary, 40-foot-tall support legs.
Our team was contracted by the structural engineer to assess if three existing temporary support foundations, used to support the antenna when it was 64-meters in diameter, could now be used to support the enlarged antenna while repairs were made.
The performance of the antenna was critical, and height movement was restricted within 1/8”. We recommended that the temporary support foundation movement be measured at all three supports during full dead loading. Linear Variable Differential Transformer (LVDT) displacement transducers or similar instrumentation was suggested to be installed during initial loading up to the full dead weight, to measure temporary support foundation displacement relative to the DSS 14 permanent reinforced concrete base. This instrumentation is expected to have a relatively low cost compared to the cost of the antenna and risk of this operation.
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Our team was part of the Gerald Desmond Bridge replacement design/build team, providing geotechnical design services for the Port of Long Beach’s (POLB’s) “iconic” cable-stayed, six-lane bridge, which will span the Back Channel in the Port of Long Beach. This bridge replacement, designed to ease traffic congestion and improve navigational safety, is budgeted at almost $700 million and being jointly procured by the Port of Long Beach and Caltrans. The bridge will replace the existing Terminal Island steel span bridge, which is at the end of its useful design life and faces critical long-term maintenance issues. Also, the old steel span bridge was not designed to manage currently roadway traffic volumes and, at 154 feet air draft, is a navigation obstruction to larger container ships that are now common at the Port.
Being that the project was under the regulatory of Caltrans, design process followed the standard Caltrans process in which a Preliminary Foundation Report (PFR) is prepared in conjunction with a Type Selection Report (TSR) for the review and approval by Caltrans of the foundation type in the case of bridge structures and earth retention systems (ERS) in the case of retaining walls. We were responsible for the design of the of the retaining structures associated with the west approach embankment; preliminary design of the retaining structures associated with the east approach embankment; design of the foundations and alternations of the existing embankment associated with the Terminal Island Freeway bridge (at the western terminus of the project area); and design of the cast-in-drilled-hole (CIDH) bridge foundations of the low level approach regions of the bridge.
What makes design/build project delivery attractive to owners is reduced cost and schedule. To reduce cost, innovations must be “unleashed” and embraced. Our California licensed Geotechnical Engineers (GEs), with our local experience, helped to build a consensus between the innovations of the international design team and the requirements and expectations Caltrans reviewers. As an example of this, the I-710 approach embankment to the north of the bridge (i.e., east approach) was entirely constructed using lightweight cellular concrete backfill to reduce settlement of underlying old fill and estuary deposits. The retaining walls required for this approach embankment were designed as Mechanically Stabilized Earth (MSE) retaining walls but the lightweight cellular concrete was used as the “backfill” material in conjunction with embankment construction.
Considerable time was spent building a consensus for seismic design to mitigate liquefaction and lateral spreading for these embankments and retaining walls over soft soils, using finite element analysis to evaluate the magnitude of wall displacement and distortion. This required both mastering state-of-the-art earthquake engineering concepts required in California, mixed with a bit of tact and diplomacy; which was delivered.
In addition to geotechnical seismic issues, there were significant geoenvironmental issues for this site. Soils and groundwater at the site were impacted with petroleum hydrocarbons and heavy metals from past local oil production and industrial facilities. Field exploration activities required the preparation of a Health and Safety Plan and a Work Plan were prepared prior to initiating subsurface explorations, which consisted of over 120 borings and 70 Cone Penetrometer Test (CPT) soundings. Soil samples were collected and tested simultaneously for both engineering properties at our Irvine in-house geotechnical laboratory, and for potentially hazardous compounds, including total petroleum hydrocarbons (TPH) carbon chain, volatile organic compounds (VOCs), polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and Title 22 metals. Soil cuttings and groundwater from borings were stored in 50-gallons drums, tested for hazardous materials, and then properly disposed of offsite. Our cross-trained staff is experienced working in urban environments where geoenvironmental issues need to be addressed simultaneously with geotechnical issues. We provide seamless geotechnical, geoenvironmental and materials testing services, safely and efficiently to reduce cost
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Metrolink is a commuter rail network operating through Los Angeles, Ventura, San Bernardino, Orange and Riverside Counties. The Perris Valley Line (PVL) was proposed from downtown Riverside to Perris to increase the mobility of the local residents. The 24 mile route runs from RCTC’s downtown Riverside Metrolink station ending in south Perris.
The project required extensive track rehabilitation, constructing new track, constructing three Stations and expansion and system upgrades on the downtown Perris Multimodal Center. Associated construction includes grading and paving, bridges and drainage structures, upgrading 21 grade crossings, and relocating existing and installing new utilities.
Our team was chosen to provide quality assurance (QA) geotechnical and materials testing and hazmat review and confirmation sampling. The project involved multiple agencies oversight including Caltrans, RCTC and local cities.
Our quick response to address unexpected construction related issues such as unstable cut slopes along various segments of the alignment and pumping subgrade soils at South Perris Station was critical to the project schedule. We also provided source inspection services and reviewed the Quality Control Plan by the plant manufacturing the precast panels.
A hazardous materials corridor study and limited environmental soil sampling and testing identified chemicals of concern (COC) along the PVL alignment. As part of the construction management team, our experts prepared a hazardous material handling and disposal plan to coordinate the identification, evaluation, waste characterization, and documentation of the final disposition of chemically-impacted soils generated at the site. A direct communication plan was established to dispatch HAZWOPER trained environmental professionals upon discovery of potential COC. This immediate response limited any delay to the project schedule. Additionally, several senior professionals were included in our project team to prepare fast-track characterization strategies.
Strategies included sample quantities and analytical testing required from trenches and/or potholes excavated by the construction contractor and analyzed for COCs utilizing mobile or fixed-based laboratories. Analytical turn-around times were established to meet the immediate schedule demands of the project, with review and reporting by a registered geologist or engineer. Volume estimates and soil management plans were incorporated quickly into the bid documents to adequately address soil disposition and off-site reuse or disposal.
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The idea to revitalize the Los Angeles River to a recreational purpose has been propelled by the City and impassioned voices in the community. Part of this vision is connecting people and places. The 30-foot-wide bridge has separate wood paths for bicycle, pedestrian, and equestrian uses, with a High Line-sequel observation points and resting areas.
Our role as geotechnical engineer-of-record began during the design phase. We performed a ground motion study and developed foundation design recommendations for the center pier and abutments. Lateral spreading mitigation alternatives were also provided to support the bridge abutments and the existing embankment immediately adjacent to the Golden State Freeway based on displacement demand of the bridge structure.
The team provided criteria for site grading and other construction considerations, including dewatering and shoring support during construction in the riverbed. Appropriate permits were obtained including the 408 Permit from the United State Army Corps (USACE) and the Flood Permit from the County of Los Angeles Department of Public Works (LADPW) Flood Control District for drilling activities.
We also provided construction support services for the project including geotechnical support during pile driving for the construction management team.
Verdantas was retained to address the requirements of the Industrial Site Recovery Act (ISRA) for the redevelopment of a former manufacturing plant with more than 100 years of industrial history in Avenel, New Jersey into commercial warehousing.
Verdantas prepared the necessary ISRA documents, including the General Information Notice to notify NJDEP of the sale of the property. The Preliminary Assessment by Verdantas identified over sixty areas of concern and recommended investigation of more than fifty areas, including underground and aboveground storage tanks, floor drains, chemical storage areas, electrical transformers, buried process materials, ground water contamination, and ecologically sensitive natural resources. The investigation included inspections of the manufacturing facility and surrounding land, soil borings, test pits, monitoring well installation and sampling, building material sampling, and an ecological risk assessment. Once the initial investigation of these areas was complete, Verdantas oversaw the demolition of the former facility to ensure compliance with the erosion control plan to prevent migration of site-related contaminants. Verdantas coordinated the site activities with US EPA to modify an existing Self-Implementing Cleanup and Disposal Plan (SIP) to facilitate the redevelopment.
At the conclusion of the demolition, Verdantas completed the delineation of the contaminated areas of concern and directed the remediation of these impacted areas. Delineation included negotiating access to six off-site properties, including privately and publicly held land. As part of redevelopment, Verdantas also designed and oversaw the installation of a sub-slab depressurization system under the new building and directed capping of the Site in accordance with the US EPA-approved SIP. Verdantas coordinated the testing and movement of excess soils generated during grading for reuse on-site, reuse off-site as alternative fill, and disposal as required.
Based on Verdantas’ track record of success conducting remediation on the Site, the client continues to retain Verdantas for environmental services across the country.
}', 13='{type=image, value=Image{width=4032,height=3024,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/demolition-oversight-avenel-nj-brownfield-redevelopment.jpg',altText=''}}', 14='{type=string, value=Demolition oversight was provided to ensure runoff of potential contaminants was mitigated.}', 15='{type=image, value=Image{width=1500,height=1125,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/building-materials-sampling-avenel-nj-brownfield-redevelopment.jpg',altText=''}}', 16='{type=string, value=Building materials were sampled to determine the potential reuse as backfill on site.}', 17='{type=image, value=Image{width=1500,height=1125,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/ground-water-sampling-avenel-nj-brownfield-redevelopment.jpg',altText=''}}', 18='{type=string, value=In-situ ground water data was collected to monitoring potential impacts to surrounding receptors.}', 19='{type=image, value=Image{width=1125,height=1500,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/underground-storage-tanks-remediated-avenel-nj-brownfield.jpeg',altText=''}}', 20='{type=string, value=Several areas of concern were remediated, including underground storage tanks.}', 21='{type=image, value=Image{width=1500,height=1125,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/vapor-intrusion-installed-avenel-nj-brownfrield-redevelopment.jpg',altText=''}}', 22='{type=string, value=A sub-slab depressurization system and vapor barrier were installed as a preventative measure against potential future vapor intrusion.}', 23='{type=image, value=Image{width=1500,height=1125,url='https://www.verdantas.com/hubfs/Projects/Avenel-NJ-Brownfield/caps-installed-avenel-nj-brownfield-remediation.jpg',altText=''}}', 24='{type=string, value= Caps were installed in accordance with the EPA SIP.}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=7}'}
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Entering this new building defines a special learning environment. Code shadowed on the windows, periodic table turned into inspired messages, and the conspicuous outside gathering stairs, all support the Medical Science and Engineering & Design curriculum offered. Built as an addition to the existing Eleanor Roosevelt High School campus, the 107,000-square-foot building provides 18 classrooms and 13 labs for robotics, 3D printing, manufacturing, health science, and medical technology. It also includes a student resource center, a research lounge, a covered outdoor lunch area and a 600-seat amphitheater that connects the two wings.
Our team provided materials testing and special inspection services which included special inspection of reinforced concrete, materials laboratory testing for concrete compressive strength and tensile and bend tests on reinforcing steel.
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Alden was retained by the Northern Water Conservancy District (Northern Water) for the Hansen Supply Canal Poudre River Drop Structure Replacement Project. Alden was the prime consultant for the Project and provided complete structural and hydraulic engineering services, including hydraulic modeling for the design of the replacement drop structure and overall site improvements. The new structure included a stepped spillway, stilling basin, and retaining walls.
Alden performed Computational Fluid Dynamics (CFD) modeling of the existing structure and the proposed structure. The new structure is designed for a peak discharge of 1,500 cfs. Alden also performed 3D finite element modeling for the structural design. Alden collaborated with Northern Water staff to identify maintenance needs and preferences for the new structure. The stilling basin includes an access bridge, jib cranes, and stoplogs to isolate the structure for future maintenance and inspections. The existing site featured extremely steep slopes at 1V:1H with poor surface drainage. The final grading established stable slopes and improved surface drainage to keep water away from the new structure.
Details of the project included:
Concrete structure demolition, removal, and repair
New concrete stepped spillway, concrete stilling basin, and concrete retaining walls
Foot bridge with access stairs
Subsurface drain system and surface drainage improvements
Temporary construction cofferdam and dewatering
Site grading and access road
Trapezoidal channel restoration and riprap sizing
The project also required coordination regarding the environmental impacts to the Preble's mouse habitat and an adjacent eagle's nest. Design was completed in July 2019. Construction was completed in March 2020 with the first water flowing through the structure on April 1, 2020.
}', 13='{type=image, value=Image{width=1200,height=675,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/Poudre-New-Construction-Structure-After-2.jpeg',altText=''}}', 14='{type=string, value=The newly constructed Poudre River Drop Structure along the Hansen Supply Canal}', 15='{type=image, value=Image{width=1200,height=675,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/site-improvements-for-new-drop-structure-poudre-river-structure-project.jpg',altText=''}}', 16='{type=string, value=Site improvements for the new Poudre River Drop Structure Project}', 17='{type=image, value=Image{width=3420,height=1869,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/Poudre-Existing-Structure-Before.jpg',altText=''}}', 18='{type=string, value=The original Poudre River Drop Structure}', 19='{type=image, value=Image{width=720,height=487,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/Poudre-Original-Structure-and-Site-Prior-New-Construction.jpg',altText=''}}', 20='{type=string, value=The existing site featured extremely steep slopes with poor surface drainage}', 21='{type=image, value=Image{width=1200,height=675,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/Poudre-River-Drop-Structure-CFD-Modeling.jpg',altText=''}}', 22='{type=string, value=Alden performed CFD modeling of the existing and proposed structures}', 23='{type=image, value=Image{width=840,height=473,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Poudre-River-Drop-Structure/Concrete-Placement-During-Periodic-Inspection-Visits-Poudre-River-Drop-Structure.jpg',altText=''}}', 24='{type=string, value=In addition to preparing design drawings and technical specifications, Alden also provided engineering services during construction}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=9}', 30='{type=string, value=
2020 H2O Project Award
The Poudre River Drop Structure Project was the recipient of The Colorado Contractors Association's 4th Annual H2O Awards. The Project won in the category of Open Concrete Flow Structures under $6 million.
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With the design and construction of a significant pump station such as Walnut Creek, also comes a sizeable electrical distribution system that is needed to support the large pumps selected for the project. The station design included a 3000Amp, 480/277VAC, switchgear lineup that included primary and alternate source main breaker scheme for transferring between power sources. The lineup included (5) soft-starters, multiple feeder breakers and step down transformers and distribution panels.
Rapid growth in the city of West Des Moines, Iowa resulted in substantial increases in stormwater runoff in most of the community’s watersheds. Such growth made it necessary to mitigate flooding on several major roadways to ensure emergency services were not impacted by closed roadways, as well as to take steps to minimize flooding commercial districts and residential neighborhoods.
Our team worked to provide a comprehensive solution for the City via mitigation solutions including construction of a new 12’ by 5’ reinforced concrete box culvert to intercept and convey interior stormwater flows, and a new 200,000 gallons per minute (gpm) stormwater pump station to discharge runoff to Walnut Creek during elevated flood stages. The stormwater pump station is proposed to be situated along Walnut Creek in an existing U.S. Army Corps of Engineers flood control project – the Des Moines, Iowa levee system. As a result, a U.S. Army Corps of Engineers Section 408 Permit was required for the modifications to the levee.
Hydrologic and hydraulic modeling was completed using XPSWMM 2014 SP1 to evaluate the required total capacity and optimal configuration for the proposed stormwater pump station, to handle both low and high flow precipitation events, using Grand Avenue as the key control elevation to manage flooding in the drainage area. The complex urban drainage area, with multiple collection and conveyance systems, as well as the evaluation taking into account storage in the proposed concrete box culvert, required the sophisticated software package to accurately model the system. The analysis resulted in approximately 200,000 gallons per minute (gpm) of pumping capacity was required to keep interior water elevations to acceptable levels.
The stormwater pump station structure required a complex structural design. A three dimensional analytical model of the pump station was created using finite element analysis. Each component of the structure (walls, slabs, foundations, etc.) was represented by a mesh of 1 ft. x 1 ft. elements that are interconnected to transfer shear, moment, and axial forces. Wall and floor slab thicknesses were computed, floatation stability of the station was determined, and foundation requirements were provided. In addition to the structural design, mechanical design was required for sluice gate intakes to the station, sluice gate outfalls to the Walnut Creek, influent trash racks, and for the pump configuration set points and discharge configuration.
The stormwater pump station was modeled with Revit® software, allowing for 3-dimensional views of the pump station proper and various components. The use of Revit also allowed for continuous updating of quantities of materials as the design progressed, yielding very accurate construction items and quantities for cost estimating. Additionally, considerable attention was given to the visual appearance of the pump station. The use of the Revit modeling software allowed for various architectural treatments to be applied to the views in a rendering fashion, assisting the client in making decisions with respect to the pump station aesthetics.
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Dam Remediation Using High and Low Mobility Pressure Grouting
Logan Martin Dam, owned and operated by Alabama Power Company, is a hydroelectric generation site located on the Coosa River in Vincent, Alabama. Since construction in the late 1960’s, ongoing remedial pressure grouting projects have targeted significant seepage flow reduction beneath the embankment dam which is founded on karst, a limestone geology characterized by underground aquifers, caverns, and the potential for sinkholes, particularly as seepage flow erodes the underlying limestone and continually changes its distribution. Alden and Alabama Power have partnered to design and construct a large scale enclosed pressure grouting test chamber (3’ wide by 3’ tall by 30’ long) and an associated test protocol to evaluate and optimize grout mix design performance in geo-materials that simulate the fractured, cavernous geology at Logan Martin Dam.
This first-of-a-kind test approach uses a small production scale grout plant to prepare and inject the high mobility grout mixtures into the test chamber. The test chamber is designed with discharge ports along its length to allow water initially occupying the test chamber—and subsequently grout—to be displaced as newly batched grout is injected. Throughout the grout injection process, pressure and temperature measurements within the test chamber, as well as discharge flow rate and discharge flow specific gravity measurements out of the test chamber, are used to monitor and evaluate grout dispersion characteristics within the chamber.
Grout injection criteria used to govern test advancement and later termination includes displaced grout quality (i.e., displaced grout specific gravity relative to that of the freshly batched grout) and the internal test chamber pressure. After grout injection, various performance metrics are evaluated to quantify mix effectiveness. The normalized grout take, for example, evaluates the overall mix efficiency by relating the injected grout volume to the volume available within the geo-material for grout to occupy.
Since conception, updates to the test facility and protocol have been made to facilitate low mobility grout testing, as well as grout performance testing in the presence of water cross flow. Results from this ongoing research program are being used to reduce grouting cost through grout mix design and bore hole spacing optimization, while also improving dam safety by increasing knowledge on how grout penetrates rock fractures without in-situ excavation.
}', 13='{type=image, value=Image{width=1500,height=575,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Grout-testing/Grout-Performance-Testing-Chamber.jpeg',altText=''}}', 14='{type=string, value=Alden and Alabama Power have partnered to design and construct a first-of-its-kind grout performance testing chamber }', 15='{type=image, value=Image{width=1600,height=575,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Grout-testing/Grout-Performance-Testing-Rock-Side-View.jpeg',altText=''}}', 16='{type=string, value=A side view of grouted rock after the grout injection process aids in evaluation of grout dispersion characteristics within the chamber}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1627657814000}', 29='{type=number, value=10}'}
{id=61570585145, createdAt=1639074811235, updatedAt=1646949456402, path='doe-downstream-fish-passage-american-eel', name='Downstream Passage for Silver American Eel', 1='{type=string, value=Modular and Scalable Downstream Passage for Silver American Eel}', 4='{type=string, value=Read how Alden tested the effects of innovative downstream fish passage technologies with lab, CFD, and field analysis. Funded by the Department of Energy}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=17, name='Fish Passage', order=16, label='Fish Passage'}, {id=18, name='Fish Protection', order=17, label='Fish Protection'}, {id=30, name='Hydropower', order=29, label='Hydropower'}, {id=31, name='Environmental Engineering', order=30, label='Environmental Engineering'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=5, name='Desktop Analysis', order=4, label='Desktop Analysis'}, {id=6, name='Field Study', order=5, label='Field Study'}, {id=8, name='Laboratory Testing', order=7, label='Laboratory Testing'}]}', 8='{type=string, value=
Through funding made available by the U.S. Department of Energy, Alden conducted a series of studies to evaluate and optimize the design and operation of two modular and scalable fish bypass systems developed specifically to provide safe downstream passage of silver American Eels at hydropower projects. The goal of the studies was to address the need for biologically effective and less expensive downstream fish passage technologies for silver eels. The studies were developed specifically for this fish species and life stage due to population declines in many areas of its range and the potential for mortality to occur if eels migrating to the marine environment to spawn are entrained through hydro turbines during their journey to the sea. The large size and unique behaviors of silver eels have made it difficult for dam owners to implement downstream passage measures that are both biologically and cost effective, resulting in a need for new innovative technologies.
The studies conducted by Alden included a laboratory evaluation of the biological performance of the two bypass systems, a field evaluation of biological performance conducted with full-scale bypass systems installed at the intake of a small hydro project in New Hampshire, CFD modeling of the laboratory flume and field evaluation site, and a desktop assessment of the potential for application of each technology at hydro projects within the known range of American Eel and the expected benefits (i.e., biological and economic). Few organizations have the capabilities to conduct this array of technical studies, but Alden’s scientists and engineers have been using various combinations of these approaches and methods to develop and evaluate state-of-the-art fish passage and protection systems for nearly 50 years.
Assistance with the performance and completion of these studies was provided by Lakeside Engineering (bypass design and installation) and Blue Leaf Environmental (DIDSON acoustic camera and 3D acoustic telemetry services).
}', 9='{type=string, value=https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Eel_Fish_Passage_2020.mp4?t=1641423507528}', 10='{type=string, value=https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Eel_Fish_Passage_Field_Study.mp4?t=1641423504203}', 11='{type=string, value=Evaluation of bypass performance with silver eels happened in both controlled laboratory settings and at a small hydro project to determine the bypass efficiency and behavioral responses, so as to optimize design and operation of the bypass systems.}', 13='{type=image, value=Image{width=1200,height=600,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Laboratory-Test-Facility-DOE-Eel-Fish-Passage-Study.jpg',altText=''}}', 14='{type=string, value=The laboratory evaluation was conducted in a large re-circulating flume using the Klawa horizontal zig-zag eel bypass system and a vertical eel bypass system developed by Lakeside Engineering}', 15='{type=image, value=Image{width=1200,height=600,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/DOE-Eel-Passage-Study-biologist-with-eel.jpg',altText=''}}', 16='{type=string, value=Silver American eels were PIT tagged and measured for length, weight, and eye diameters prior to testing}', 17='{type=image, value=Image{width=1200,height=580,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Pathlines-colored-by-velocity-DOE-Eel-Fish-Passage-Study.jpg',altText=''}}', 18='{type=string, value=CFD modeling was performed to model the hydraulic conditions of the lab and field studies}', 19='{type=image, value=Image{width=1200,height=600,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Mine-Falls-Field-Installation-DOE-Eel-Passage-Study-1.jpg',altText=''}}', 20='{type=string, value=Field evaluation of biological performance conducted with full-scale bypass systems installed at the intake of a small hydro project}', 21='{type=image, value=Image{width=1200,height=600,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/DOE-Eel-Passage/Mine-Falls-Hydro-Project-Nashua-NH-DOE-Eel-Passage-Study-Field-Location.jpg',altText=''}}', 22='{type=string, value=Mine Falls Hydroelectric Project, located on the Nashua River in Nashua, New Hamsphire, was chosen as the site for the field evaluation}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=12}', 33='{type=number, value=0}', 34='{type=list, value=[{id=11, name='Natural Resources & Environmental Planning', order=5, label='Natural Resources & Environmental Planning'}]}', 37='{type=list, value=[{id=111, name='Fish Passage Design, Modeling & Testing', order=62, label='Fish Passage Design, Modeling & Testing'}, {id=112, name='Fish Protection Design, Modeling & Testing', order=63, label='Fish Protection Design, Modeling & Testing'}]}', 39='{type=string, value=doe-downstream-fish-passage-american-eel}'}
{id=112874844325, createdAt=1682525062296, updatedAt=1682529004582, path='middletown-rapid-infiltration-basins', name='Middletown Rapid Infiltration Design and Permitting', 1='{type=string, value=Middletown Rapid Infiltration Design and Permitting}', 33='{type=number, value=0}', 34='{type=list, value=[{id=14, name='Process Engineering', order=8, label='Process Engineering'}]}', 4='{type=string, value=Verdantas assisted is resurrecting a plan to install Rapid Infiltration Basins (RIBs) on existing Town lands}', 36='{type=string, value=Middletown, Delaware}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=87, name='Construction Services', order=38, label='Construction Services'}, {id=90, name='Water & Wastewater Design', order=41, label='Water & Wastewater Design'}, {id=114, name='Geotechnical Engineering', order=65, label='Geotechnical Engineering'}]}', 38='{type=string, value=Town of Middletown}', 8='{type=string, value=
The Town of Middletown, Delaware owns and operates its own wastewater system including their treatment plant and disposal systems. They has traditionally relied on irrigation of treated wastewater on Town owned dedicated spray fields as well as reuse on turfgrass and adjacent farmlands. Rapid Town growth has driven an increase in wastewater volumes while also consuming available land around the Town reducing opportunities for increasing the disposal system capacity.
Verdantas assisted the Town is resurrecting a plan to install Rapid Infiltration Basins (RIBs) on existing Town lands. RIBs provide a greater disposal capacity per unit area then irrigation systems. The RIBS were constructed primarily within existing irrigation system buffer areas to maximize disposal capacity on the site. Our team prepared plans and permitting documents for 20 new RIBs on the Town’s Ford Farm site, assisted with construction review, and are now conducting full scale infiltration studies to optimize operations. Current disposal capacity uis 0.8 MGD.
}', 13='{type=image, value=Image{width=672,height=854,url='https://www.verdantas.com/hubfs/Projects/Middletown-RIBS/middletown-ribs-ford-farm-before.jpg',altText=''}}', 14='{type=string, value=Ford Farm Wastewater Disposal Area Circa 2007, spray fields areas are depicted with green outlines}', 15='{type=image, value=Image{width=601,height=816,url='https://www.verdantas.com/hubfs/Projects/Middletown-RIBS/middletown-ribs-ford-farm-after.jpg',altText=''}}', 16='{type=string, value=Ford Farm Wastewater Disposal Area Circa 2022, RIBs can be seen in the shaded area}', 17='{type=image, value=Image{width=1600,height=1205,url='https://www.verdantas.com/hubfs/Projects/Middletown-RIBS/During%20Construction.jpg',altText=''}}', 18='{type=string, value=A RIB under construction}', 19='{type=image, value=Image{width=4032,height=3024,url='https://www.verdantas.com/hubfs/Projects/Middletown-RIBS/Complete.jpg',altText=''}}', 20='{type=string, value=A RIB after completion of project}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=12}'}
{id=61570585150, createdAt=1639074811246, updatedAt=1652732050380, path='seabrook-pipe-lining-testing', name='Seabrook Pipe Lining Testing', 1='{type=string, value=Seabrook Pipe Lining Testing}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Alden performed mock-up flow testing to help determine the effects of cured in place pipe lining on flow performance at the Seabrook Nuclear Power Plant.}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=96, name='Hydraulic Structure Engineering Design', order=47, label='Hydraulic Structure Engineering Design'}, {id=97, name='Hydraulic Modeling & Consulting', order=48, label='Hydraulic Modeling & Consulting'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=25, name='Hydraulic Modeling', order=24, label='Hydraulic Modeling'}, {id=27, name='Pipeline Repair', order=26, label='Pipeline Repair'}, {id=28, name='Hydraulic System Maintenance', order=27, label='Hydraulic System Maintenance'}, {id=32, name='Irrigation', order=31, label='Irrigation'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=13, name='Hydraulic Engineering and Design', order=12, label='Hydraulic Engineering and Design'}, {id=15, name='Mock-Up Testing', order=14, label='Mock-Up Testing'}]}', 39='{type=string, value=seabrook-pipe-lining-testing}', 8='{type=string, value=
Alden was contracted by Imperia Engineering for mock-up and head loss testing of cured in place pipe (CIPP) lining. Seabrook Nuclear Power plant was planning to perform maintenance on its service water piping system which consists of safety and non-safety function concrete lined pipe. The planned maintenance consisted of lining the pipes using a glass fiber reinforced epoxy resin composite. To ensure the maintenance activity would be successful, Imperia Engineering organized a mock-up test of the installation mechanics for the smallest inner diameter pipe (20”) and contracted Alden to perform flow testing on the mock-up pipe loop to help determine the effects of the lining on the flow performance of the piping network.
The chosen piping configuration for the mock-up test focuses on a section of 20” pipe that supplies systems related to turbine cooling. The section in question combined a number of direction and elevation changing pipe fittings. Incorporating this section into the mock-up provided a challenge for the installer and provided some insight into the potential stack-up of flow losses from these types of fitting combinations. It made the positive identification of individual fitting losses much more challenging.
Along with assembling the provided test piping, Alden constructed a custom flow loop with a large recirculation pump and a flow meter assembly. The flow meter assembly consisted of two flow meters allowing measurements of flow rate to better than 1% uncertainty down to 2000 gpm. The recirculation pump had a relatively low discharge head capability (<45ft) but a high run out flow rate of 17,500 gpm. The loop was connected to a large water tank reservoir to allow the loop to be reconfigured and accessed between tests.
Each piece of test piping was outfitted with multiple sets of taps for the purpose of pressure loss measurements. Pressure loss measurements along the pipeline were taken at a range of flow rates to evaluate Reynolds number effects.
The pipeline was tested by Alden first in its original cement lined state, then with Weko seals installed at various joint locations, and then finally following CIPP lining of the entire length of test piping (lining performed onsite at Alden by Aquarehab). Alden analyzed the test results to determine friction losses and loss coefficients for each type of fitting and straight sections of pipe, under all three scenarios, providing the required insight to the viability of CIPP lining at Seabrook. Measurements showed that the friction factor drop in the pipe was sufficient to compensate for the reduced pipe diameter. However, losses substantially increased at turns where excess material folds increase turbulent losses by obstructing flow near the inside turn of the wall. Mock-up testing and careful hydraulic analysis is therefore required when applying the lining system to a pipeline where the pump performance margin is small.
Contact us for more information on mock-up testing.
}', 13='{type=image, value=Image{width=1500,height=900,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Seabrook-Pipe-Lining-Testing/Seabrook-Lined-Pipes-Lining-Contractor-AquaRehab.jpg',altText=''}}', 14='{type=string, value=Alden constructed a custom flow loop with the provided test piping that was lined onsite by a contractor}', 15='{type=image, value=Image{width=1500,height=900,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Seabrook-Pipe-Lining-Testing/Finished-Epoxy-Lined-Pipe-to-Elbow-for-mock-up-testing.jpg',altText=''}}', 16='{type=string, value=Mock-up testing and careful hydraulic analysis provided insight to the viability of CIPP lining at Seabrook}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1633353156000}', 29='{type=number, value=13}'}
{id=61570585103, createdAt=1639074811140, updatedAt=1685454593740, path='mid-barataria-sediment-diversion', name='Mid-Barataria Sediment Diversion', 1='{type=string, value=Mid-Barataria Sediment Diversion}', 4='{type=string, value=Alden constructed two 1:65-scale, live-bed physical models to test performance and effectiveness of the proposed land rebuilding diversions on the Mississippi River.}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}, {id=19, name='Government', order=4, label='Government'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=11, name='Sediment Modeling', order=10, label='Sediment Modeling'}]}', 8='{type=string, value=
Between 1932 and 2010 the state of Louisiana has lost about 2006 square miles of land due to a combination of subsidence, sea level rise, and management of the Mississippi River. Computer models predict a further loss of 1800 to 4200 square miles in the next 50 years, amounting to 55% of the land in Plaquemines Parish and resulting in $300 million in annual economic damage. Following hurricanes Katrina and Rita, the Coastal Protection and Restoration Authority (CPRA) was formed as a single state entity with the authority to protect and restore the lands of coastal Louisiana.
The $50 billion coastal master plan includes restoration and risk reduction projects. The restoration projects include barrier island restoration, hydrologic restoration, marsh creation, ridge restoration, sediment diversion, and shoreline protection. The Barataria and Breton Basins have experienced some of the largest land loss—almost 700 square miles. Two sediment diversions are being designed, one for each basin. The sediment diversions connect the Mississippi River to the basins, allowing for the controlled diversion of up to 75,000 cfs of water and sediment to the Barataria basin and 30,000 cfs to the Breton basin.
The design and construction of sediment diversions on the scale proposed for Barataria and Breton is unprecedented, the results of which will rely heavily on the numeric and physical modeling required to design the major diversion features, including the inlet, conveyance, and outlet structures. Alden is constructing two 1:65-scale, live-bed physical models to test performance and effectiveness of the diversions.
}', 9='{type=string, value=https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/client-visit-052119.mp4?t=1641419619612}', 13='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Client-Visit-052119.jpeg',altText=''}}', 14='{type=string, value=Clients and Alden Engineers discussing model at initial testing visit}', 15='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Final-Construction-Diversion.jpeg',altText=''}}', 16='{type=string, value=Model of the river sediment diversion inlet prior to water and sediment being added to the model}', 17='{type=image, value=Image{width=2048,height=1328,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Final-Construction-Ship-2.jpeg',altText=''}}', 18='{type=string, value=Model of a barge being used in conjuction with Mississippi River model for Mid-Barataria}', 19='{type=image, value=Image{width=4032,height=2315,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Mid-B-Construction-River-Bed.jpeg',altText=''}}', 20='{type=string, value=The Mid-Barataria Mississippi River model in mid-construction}', 21='{type=image, value=Image{width=4024,height=2244,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Mid-B-Template-Construction.jpeg',altText=''}}', 22='{type=string, value=Templating the river model
}', 23='{type=image, value=Image{width=2016,height=1055,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Mid-Barataria/Mid-Barataria-River-Sediment.webp',altText=''}}', 24='{type=string, value=Sediment is simulated using hand-screed light weight media, spread 4-8 inches thick in this live bed model}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1633353229000}', 29='{type=number, value=14}', 33='{type=number, value=1}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 37='{type=list, value=[{id=96, name='Hydraulic Structure Engineering Design', order=47, label='Hydraulic Structure Engineering Design'}, {id=97, name='Hydraulic Modeling & Consulting', order=48, label='Hydraulic Modeling & Consulting'}]}', 39='{type=string, value=mid-barataria-sediment-diversion}'}
{id=109859635311, createdAt=1680794833631, updatedAt=1682517893630, path='scioto-ridge-wind-farm', name='Scioto Ridge Wind Farm', 1='{type=string, value=Scioto Ridge Wind Farm}', 33='{type=number, value=0}', 34='{type=list, value=[{id=8, name='Sustainability', order=2, label='Sustainability'}]}', 35='{type=string, value=RWE Renewables}', 4='{type=string, value=Read how the construction of a 75-turbine onshore wind electric generation facility was supported by Verdantas.}', 36='{type=string, value=Hardin and Logan Counties, Ohio}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 8='{type=string, value=
RWE Renewables, a global energy company, constructed a 75-turbine, 250 MW onshore wind electric generation facility between 2019 and 2021. It went into commercial operation in June 2021. The project includes Siemens Gamesa turbines and is RWE’s first onshore wind project in Ohio. It has the capacity to provide clean energy for more than 60,000 households.
Verdantas was selected to provide civil engineering design, land surveying, ODOT and County roadway permitting, surface water delineations and ecological surveys, SPCC plan preparation, Decommissioning Plan preparation, Ohio EPA construction stormwater permit and Stormwater Pollution prevention Plan (SWP3) preparation, surface water permitting, storm water inspections during construction, and ecological specialist services during construction.
Temporary intersection improvements were designed for turbine blades that were up to 211 feet long and weighed 31,200 pounds. The nacelle units weighed 250,000 pounds. The project study area included approximately 50 square miles (31,986 acres) and required approximately 38 miles of new access roads and approximately 75 miles of electrical collection lines.
Even though McGuire Nuclear Power Plant is located on the shores of Lake Norman, it relies on cooling water from a separate service water pond. Duke Energy, operators of the plant, wanted to investigate the conditions of the service pipeline that connects the service pond to the plant. They elected to use a robotic underwater vehicle attached to a tether. However, because the service water line connecting the pond to the plant is an important safety function, the retraction tension on the robotic underwater vehicle needed to be validated before the vehicle was deployed using a mock-up test.
Mock-up testing would determine if the tether would remain within the tether failure tension after the vehicle has advanced past several turns and more than several hundred feet into the pipeline. The main sources of tension on the tether are the turns in the pipeline.
Alden worked with Hibbard Inshore to set up a model of the pipeline bends with limited straight pipe lengths between them to correctly simulate the tether friction during a retraction. In addition, the mock-up test demonstrated to the plant the ability to identify various pipeline characteristics of interest that could be encountered during the real inspection. The mock-up also provided a similar level of water visibility to ensure the rover inspection would still be successful under turbid water conditions.
Contact us for more information on mock-up testing.
}', 13='{type=image, value=Image{width=2304,height=1296,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Rover/Alden-Rover-Mock-Up-Test-Piping.jpg',altText=''}}', 14='{type=string, value=A model of the pipeline bends was used to correctly simulate the friction that the tether would experience during a retraction}', 15='{type=image, value=Image{width=2304,height=1296,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Rover/Alden-Rover-Mock-Up-Test-Rover.jpg',altText=''}}', 16='{type=string, value=By using a mock-up test, the team at Alden was able to validate the retraction tension on a robotic underwater vehicle before the vehicle was deployed}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=15}'}
A Heat Recovery Steam Generator (HRSG) had suspected flow deficiencies which was causing suboptimal performance of the unit. Alden was contacted to use CFD to conduct an evaluation of the unit and design flow controls to improve its steam generation.
To complete this evaluation, Alden developed a baseline CFD model of the HRSG from the turbine outlet to the tube bank inlet to understand how the flow develops in this section. An area of recirculation and the reasons it developed were identified. A set of flow controls was designed to address the recirculating gas. Alden worked with the client to ensure that the flow controls were both effective and practical to construct and install into the existing system.
Results
Using the drawings provided, the oil & gas plant constructed and implemented the flow controls designed by Alden. Subsequently, the plant saw a 17% improvement in steam generation when the unit was tested with the new flow controls
Project Highlights
CFD model identified flow inefficiency
Flow controls were iteratively designed with input from the clients
Steam generation increased 17% after implementation of the flow controls
}', 13='{type=image, value=Image{width=1185,height=575,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/HSRG-Flow-Control/HRSG-Baseline-CFD.jpg',altText=''}}', 14='{type=string, value=Alden developed baseline CFD to evaluate a HRSG unit with suspected flow deficiencies}', 15='{type=image, value=Image{width=1185,height=575,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/HSRG-Flow-Control/HRSG-Flow-Control-CFD.jpg',altText=''}}', 16='{type=string, value=A set of flow controls were designed to address an area of recirculating gas}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1627931745000}', 29='{type=number, value=16}'}
{id=112550840187, createdAt=1682343687230, updatedAt=1682529002448, path='west-influent-pump-replacement', name='West Influent Pump Replacement', 1='{type=string, value=West Influent Pump Replacement}', 33='{type=number, value=1}', 34='{type=list, value=[{id=9, name='Precise Visual Technologies', order=3, label='Precise Visual Technologies'}, {id=14, name='Process Engineering', order=8, label='Process Engineering'}, {id=15, name='Mechanical, Electrical, and Automation Engineering', order=9, label='Mechanical, Electrical, and Automation Engineering'}]}', 35='{type=string, value=City of Bethlehem}', 4='{type=string, value=Read about the full service engineering that helped the City of Bethlehem upgrade its activated sludge wastewater treatment plant}', 36='{type=string, value=Bethlehem, Pennsylvania}', 8='{type=string, value=
The City of Bethlehem currently operates a 20-million gallon per day (gpd) activated sludge wastewater treatment plant, which has the ability to handle peak wet weather flows of 50 million gpd.
This project included upgrades to the West Influent Pump Room, which contained three (3) constant speed Yoemens 100 hp dry pit submersible pumps, each with a capacity of 12 MGD. The scope included the replacement of existing pumps along with all piping, valves, and appurtenances located within the West Influent Pump Room. The new pumps were designed to operate on variable frequency drives (VFDs) and controlled on wet well level as monitored by instrumentation. This upgrade also included replacement of the MCCs, and upgrade of the existing control and alarm panels that were integrated into the plant’s existing SCADA system. The scope also included design of a new ventilation system and replacement of existing stairs and platforms.
Our experts leveraged 3D scanning and 3D modeling technology to efficiently design the project. Because space was limited, and all new equipment had to fit within the existing structure, our team scanned the existing facility to develop an accurate as-built the facility, and utilized the scan to develop an accurate 3D model to design the required improvements. The City was able to maintain operation of the treatment plant throughout the duration of the project.
Our team was responsible for all survey, mechanical, electrical, structural and automation design disciplines, preparation of bidding documents, and assisting the City with construction administration services}', 13='{type=image, value=Image{width=745,height=536,url='https://www.verdantas.com/hubfs/Projects/Bethlehem-West-Influent/Bethlehem%201.jpg',altText=''}}', 14='{type=string, value=Leveraging 3D scanning helped develop an accurate 3D model to design the required improvements.}', 15='{type=image, value=Image{width=357,height=243,url='https://www.verdantas.com/hubfs/Projects/Bethlehem-West-Influent/Bethlehem%202.png',altText=''}}', 16='{type=string, value=our team scanned the existing facility to develop an accurate as-built the facility}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=16}'}
{id=73435460004, createdAt=1652367720232, updatedAt=1653507084470, path='brooks-park-wetland-restoration', name='Brooks Park Wetland Restoration | Buckeye Lake, Ohio', 1='{type=string, value=Brooks Park Wetland Restoration | Buckeye Lake, Ohio}', 4='{type=string, value=Using funds secured through H2Ohio, our team created wetlands and natural stream features to improve water quality and habitat}', 5='{type=list, value=[{id=19, name='Government', order=4, label='Government'}]}', 8='{type=string, value=
The Ohio Department of Natural Resources (ODNR) worked with the Verdantas team to restore a riparian wetland system along a portion of Murphy’s Run at Brooks Park on the southwest side of Buckeye Lake. Murphy’s Run and Buckeye Lake are both Ohio EPA 303(d) Listed Impaired Waters. Murphy’s Run, and the greater watershed contributing to Buckeye Lake, was impacted by sedimentation and nutrient loading, specifically high concentrations of phosphorus, in part caused by runoff from the surrounding landscape, which included active row crop farming and animal feeding operations, as well as residential developments within close proximity to Buckeye Lake.
Previous studies by Ohio EPA identified excessive sediment and phosphorus loadings into Buckeye Lake were attributed to its tributaries that include Murphy’s Run. The sediment and phosphorus loading of the shallow lake has led to frequent nuisance algal blooms capable of producing microcystin that in some cases resulted in temporary beach and water activity closures.
With funds secured through H2Ohio, ODNR contracted with our team to create wetlands and natural stream features as a component of a multi-faceted strategy for improving water quality and habitat in Murphy’s Run and Buckeye Lake. Our team was tasked with site characterization, survey, design, permitting, construction plan preparation, bidding activities, and construction oversight to meet the H2Ohio program goals of improving water quality. Construction was completed in June 2021.
Important project features include:
Creation of approximately 2.5 acres of quality wetland habitat.
Realignment of approximately 700 linear feet of Murphy’s Run.
Construction of an oversized pool in Murphy’s Run that will slow down the water flow and allow sediment to settle in the bottom of the pool before water enters the wetlands and realigned stream.
Installation of native trees, shrubs, grasses, and flowers.
Project benefits include:
Better water quality and clarity in Buckeye Lake through the reduction of up to 362 pounds of nitrogen, 60 pounds of phosphorus, and 44 tons of sediment each year.
More stormwater storage capacity and treatment opportunities as stormwater moves through the wetlands areas, stream channel floodplain, and realigned stream channel.
Higher quality, native ecological community that is more diverse and resilient.
}', 13='{type=image, value=Image{width=1500,height=844,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/buckeye-lake-h2ohio-wetlands.jpg',altText=''}}', 14='{type=string, value=Approximately 2.5 acres of quality wetland habitat with native trees, shrubs, grass was created}', 15='{type=image, value=Image{width=490,height=370,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/Buckeye-Lake-During-Storm-Event.jpg',altText=''}}', 16='{type=string, value=Murphy's Run during a storm event.}', 17='{type=image, value=Image{width=1000,height=563,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/buckeye-lake-h2ohio-site-overview.jpg',altText=''}}', 18='{type=string, value=Overview of the Brooks Park Wetland Area}', 19='{type=image, value=Image{width=1000,height=563,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/buckeye-lake-h2ohio-observation-area.jpg',altText=''}}', 20='{type=string, value=The final design provides a higher quality, native ecological community that is more diverse and resilient.}', 21='{type=image, value=Image{width=1000,height=667,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/buckeye-lake-h2ohio-ribbon-cutting.jpg',altText=''}}', 22='{type=string, value=Conner Smith, Ecological Restoration Project Manager, is pictured second from left at the Brooks Park Wetland Creation & Water Quality Initiative ribbon cutting ceremony}', 23='{type=image, value=Image{width=1000,height=667,url='https://www.verdantas.com/hubfs/PROJECTS/Buckeye%20Lake/Buckeye-Lake-Signage.jpg',altText=''}}', 24='{type=string, value=Signage explains the benefits of Wetland Creation, including how wetlands can reduce negative impacts of stormwater}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=17}', 33='{type=number, value=1}', 34='{type=list, value=[{id=11, name='Natural Resources & Environmental Planning', order=5, label='Natural Resources & Environmental Planning'}]}', 35='{type=string, value=Ohio Department of Natural Resources}', 36='{type=string, value=Buckeye Lake, Ohio}', 37='{type=list, value=[{id=49, name='Site Assessment', order=0, label='Site Assessment'}, {id=69, name='Resiliency', order=20, label='Resiliency'}, {id=83, name='Site Engineering', order=34, label='Site Engineering'}, {id=86, name='Landscape Architecture', order=37, label='Landscape Architecture'}, {id=88, name='Survey', order=39, label='Survey'}, {id=103, name='Ecology', order=54, label='Ecology'}, {id=104, name='Wetlands', order=55, label='Wetlands'}, {id=105, name='Water Quality & Hydrology', order=56, label='Water Quality & Hydrology'}, {id=108, name='Impact Assessment, Planning & Permitting', order=59, label='Impact Assessment, Planning & Permitting'}]}', 39='{type=string, value=brooks-park-wetland-restoration}'}
{id=61570585104, createdAt=1639074811143, updatedAt=1685454589218, path='cedar-cliff-spillway', name='Cedar Cliff Spillway', 1='{type=string, value=Cedar Cliff Spillway}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=Physical model study to determine hydraulic performance of a proposed auxiliary spillway system during flooding events}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=2, name='Spillways', order=1, label='Spillways'}, {id=30, name='Hydropower', order=29, label='Hydropower'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}]}', 39='{type=string, value=cedar-cliff-spillway}', 8='{type=string, value=
The Cedar Cliff dam and hydropower project is located approximately six miles from Cullowhee, in Jackson Country, North Carolina. The dam and hydroelectric facility is owned by Duke Energy and is located downstream of three other hydroelectric projects that are operated as a system.
The primary spillway includes a Tainter gate and the existing auxiliary spillway system includes two fuse plug sections (with different crest/activation elevations). It was determined that the combination of the primary and auxiliary spillway systems were not adequate to safely pass the regulatory-increased Inflow Design Flood (IDF). The construction of a Hydroplus Fusegate system with six semi-labyrinth Fusegates in an enlarged auxiliary spillway channel was selected to increase spillway capacity to safely pass the new IDF which is now the full Probable Maximum Flood (PMF).
Two reduced scale physical models were constructed to determine the required size of a ventilation system for the proposed Cedar Cliff Fusegates and headpond and tailwater levels at each Fusegate for flows up to the sixth Fusegate activating. The tailwater levels were required for design of the Fusegate ballast system.
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{id=112874844791, createdAt=1682529007845, updatedAt=1682529648579, path='global-waste-material-reuse-project', name='Waste Material Reuse Project', 1='{type=string, value=Building a new global waste material reuse business on the Delaware waterfront}', 33='{type=number, value=1}', 34='{type=list, value=[{id=12, name='Geotechnical and Geological Engineering', order=6, label='Geotechnical and Geological Engineering'}, {id=13, name='Site and Roadway Civil Engineering', order=7, label='Site and Roadway Civil Engineering'}, {id=17, name='Structural Engineering and Architecture', order=11, label='Structural Engineering and Architecture'}]}', 4='{type=string, value=Read how Verdantas helped a client build a new global waste material reuse business on the Delaware waterfront}', 36='{type=string, value=Wilmington, Delaware}', 5='{type=list, value=[{id=17, name='Industrial', order=2, label='Industrial'}]}', 38='{type=string, value=Penn Mag, Inc. }', 8='{type=string, value=
Penn Mag Inc. approached Verdantas to provide a geotechnical evaluation for a former industrial site located at the Port of Wilmington. Their goal was business expansion in the form of a new bulk material processing facility.
Penn Mag’s idea was to obtain high quality steel processing waste slag from Japan, ship it to Wilmington Delaware, refine it, and sell it to local ready mic concrete plants. The refined slag can replace virgin cement. The environmental benefits of the project included reuse of a former industrial site reuse of a recycled material in lieu of a completely manufactured product.
We were able to offer additional services, beyond geotechnical engineering, to help Penn Mag complete their project including critical environmental permitting that threatened to stop the project.
}', 13='{type=image, value=Image{width=621,height=477,url='https://www.verdantas.com/hubfs/Projects/Penn-Mag/penn-mag-completed-site.png',altText=''}}', 14='{type=string, value=Completed project site photo}', 15='{type=image, value=Image{width=807,height=441,url='https://www.verdantas.com/hubfs/Projects/Penn-Mag/Render.jpg',altText=''}}', 16='{type=string, value=Render of proposed facility}', 17='{type=image, value=Image{width=1570,height=944,url='https://www.verdantas.com/hubfs/Projects/Penn-Mag/Before.jpg',altText=''}}', 18='{type=string, value=Predeveloped site aerial photo}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=20}', 30='{type=string, value=
Verdantas provided comprehensive civil, environmental, geotechnical, traffic and construction services for the construction of a 1.6 million square foot, state-of-the-art Amazon Logistics Center on a 125-acre site in central New Castle County, DE. The site was a former borrow pit that required extensive regrading and fill. Soft soils conditions require a ground improvement program consisting of deep dynamic compaction.
All studies, design, and project approvals were accomplished in an expedited manner in less than seven months. The Verdantas team worked closely with the owner, construction manager and building tenant to address design and operational changes requested during the latter stages of design and throughout the construction process. Project construction, including over 800,000 cubic yards of site earthwork, was completed in 10 months.
}', 13='{type=image, value=Image{width=959,height=630,url='https://www.verdantas.com/hubfs/Amazon.png',altText=''}}', 14='{type=string, value=The new Amazon Logistics Center in Bear, DE.}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=22}'}
{id=62875256350, createdAt=1640875885529, updatedAt=1660058041316, path='amazon-distribution-center', name='e-Commerce Distribution Center', 1='{type=string, value=E-Commerce Distribution Center}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Civil site design and construction services for distribution facility.}', 36='{type=string, value=Etna, OH}', 5='{type=list, value=[{id=21, name='Technology', order=6, label='Technology'}]}', 37='{type=list, value=[{id=88, name='Survey', order=39, label='Survey'}]}', 39='{type=string, value=amazon-distribution-center}', 8='{type=string, value=
Verdantas performed a significant scope of services for the ProLogis Park 70 E-Commerce site in Etna Township, Ohio.
The build to suit project consisted of site development for a 855,000 sf building that could accommodate truck dock facilities on the west side at completion of construction and accommodate truck dock facilities in the future on the east side along with a large employee parking area.
The storm water outlet for the site was located within the limited access right-of-way for Interstate 70, therefore Verdantas worked closely with the Licking County Engineer’s Office and Ohio Department Of Transportation on the storm water control of the project. Along with the on-site design Verdantas was also required to analyze the offsite storm water runoff from the eastern site (the Holy Cross Cemetery) and provide an overflow swale to collect higher rainfall events and re-route storm water runoff from the creek.
In addition, Verdantas' survey department provided all aspects of surveying services for this project. Verdantas performed an ALTA survey of the original property and all legal descriptions prior to the development of the industrial park.
Along with a development of this magnitude, roadway improvements were also required. Verdantas worked with the Licking County Engineer’s Office and ODOT to provide a comprehensive Traffic Impact Analysis as well as the design and construction plans for the turn lanes and signals on SR 40 and Etna Parkway. Verdantas managed the improvements through the public bidding and construction phases.
The schedule for this project demonstrates Verdantas' ability to meet the owner’s goals for the project, coordinate with the contractors during construction and also maintain the high level of design requirements for the reviewing agencies. While this building has not obtained formal LEED (Leadership in Energy and Environmental Design) certification, all aspects of the civil design meet the LEED design requirements for storm water runoff and control.
{id=112854923675, createdAt=1682517842351, updatedAt=1682529845218, path='tuppers-plains-chester-water-district-phase-10-improvements', name='Tuppers Plains-Chester Water District Phase 10 Improvements', 1='{type=string, value=Tuppers Plains-Chester Water District Phase 10 Water System Improvements}', 33='{type=number, value=1}', 34='{type=list, value=[{id=14, name='Process Engineering', order=8, label='Process Engineering'}]}', 4='{type=string, value=Read how Verdantas helped the water district improve their existing water infrastructure, including a system-wide meter replacement}', 36='{type=string, value=Reedsville, Ohio}', 38='{type=string, value=Tuppers Plains-Chester Water District}', 8='{type=string, value=
Verdantas worked with Tuppers Plains–Chester Water District (TPCWD) to complete their Phase 10 Water System Improvements. TPCWD desired to improve existing water infrastructure within Chester and Bedford townships of Meigs County. The improvements included approximately 45,600 feet of 12, 10” and 8” waterline replacement, a new 250,000-gallon elevated water storage tank and a new above-grade 500 gpm booster station. In addition, the project included system-wide water meter replacement of approximately 5,500 residential and commercial AMR water meters.
Verdantas provided project administration, survey, detailed design, permitting, bidding, construction administration and construction observation services on this nearly $6.8 million project. The project was ranked #18 among Ohio EPA’s Water Supply Revolving Loan Account statewide projects and received 50% of those funds in principal forgiveness with the balance in 0% interest loan. The project also received $250,000 in an Appalachian Regional Commission Grant.
The project involved coordination and permitting with ODOT, Meigs County Engineer and townships for work along and across roadways including US 33.
}', 13='{type=image, value=Image{width=1200,height=800,url='https://www.verdantas.com/hubfs/Projects/Tuppers-Plains-Chester-Water-District/Tuppers-Plains-Chester-Water-District-Tower-Closeup.jpg',altText=''}}', 15='{type=image, value=Image{width=1200,height=800,url='https://www.verdantas.com/hubfs/Projects/Tuppers-Plains-Chester-Water-District/Tuppers-Plains-Chester-Water-District-Tower.jpg',altText=''}}', 16='{type=string, value=Improvements included a new 250,000-gallon elevated water storage tank}', 17='{type=image, value=Image{width=1200,height=800,url='https://www.verdantas.com/hubfs/Projects/Tuppers-Plains-Chester-Water-District/Tuppers-Plains-Chester-Water-District-Booster.jpg',altText=''}}', 18='{type=string, value=Improvements included a new above-grade 500 gpm booster station}', 25='{type=number, value=0}', 27='{type=number, value=0}', 29='{type=number, value=23}', 30='{type=string, value=
Project Details:
Construction completed in 2020
$6.8 million project cost (over $3.5 million in GRANTS)
{id=62875256391, createdAt=1640877859249, updatedAt=1667487640360, path='brownfields-redevelopment', name='Brownfields Redevelopment - Stony Creek Brewery', 1='{type=string, value=Brownfields Redevelopment - Stony Creek Brewery}', 33='{type=number, value=0}', 34='{type=list, value=[{id=6, name='Environmental Assessment & Remediation', order=0, label='Environmental Assessment & Remediation'}]}', 35='{type=string, value=Land Development/Brownfields}', 4='{type=string, value=Using a deep understanding of area geology, our team recommended proper design and foundation support for building construction at this brownfield site}', 36='{type=string, value=Bradford, CT}', 5='{type=list, value=[{id=16, name='Real Estate', order=1, label='Real Estate'}]}', 37='{type=list, value=[{id=49, name='Site Assessment', order=0, label='Site Assessment'}, {id=51, name='Remediation', order=2, label='Remediation'}, {id=83, name='Site Engineering', order=34, label='Site Engineering'}, {id=114, name='Geotechnical Engineering', order=65, label='Geotechnical Engineering'}]}', 39='{type=string, value=brownfields-redevelopment}', 8='{type=string, value=
Our team performed a geotechnical assessment for the construction of the Stony Creek Brewery. The building was constructed along the shoreline of the Branford River on a Brownfields site. Our deep understanding of the geology of the area resulted in our recommended design of steel H pile foundations to support the new building above a miscellaneous fill layer and an organic marsh deposit that was underlain by glacial till and bedrock. Our team also optimized the pile size for maximized load capacity, resulting in minimized cost for construction.
Achievements
CONSTRUCTION OVERSIGHT AND TESTING –Oversight of the steel H pile installations was provided, along with additional geotechnical evaluations to assess changes to the project that occurred during construction. Our staff performed evaluation of dynamic pile load tests to verify the design pile load capacities and assessed the suitability of pile driving hammer energy with respect to allowable pile stresses (i.e., the likelihood of the piles being damaged by the hammer during installation). Based upon the test results, our experts confirmed that our pile design was acceptable for construction of the project and verified the efficiency and cost effectiveness of the selected steel H pile size.
Our team performed oversight of the pile installation and assisted the contractor with production efficiency and minimizing pile material waste. Installation of each pile was documented for consistency with the project specifications, and communicated this field documentation with local regulators, as required.
{id=61650352130, createdAt=1639158100455, updatedAt=1682512451494, path='pwd-green-stormwater-infrastructure-design', name='PWD Green Stormwater Infrastructure Design', 1='{type=string, value=PWD Green Stormwater Infrastructure Design}', 33='{type=number, value=0}', 34='{type=list, value=[{id=8, name='Sustainability', order=2, label='Sustainability'}, {id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=13, name='Site and Roadway Civil Engineering', order=7, label='Site and Roadway Civil Engineering'}]}', 35='{type=string, value=The City of Philadelphia Water Department}', 4='{type=string, value=Green stormwater infrastructure design for the City of Philadelphia Water Department}', 36='{type=string, value=Philadelphia, PA}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}, {id=19, name='Government', order=4, label='Government'}]}', 37='{type=list, value=[{id=90, name='Water & Wastewater Design', order=41, label='Water & Wastewater Design'}]}', 39='{type=string, value=pwd-green-stormwater-infrastructure-design}', 8='{type=string, value=
The City of Philadelphia was more progressive than most older northeastern cities when addressing confined sewer overflow issues that are typical of aging and outdated underground infrastructures. Instead of the usual downgradient treatment plants, they decided to capture and infiltrate rainwater near the source, thereby mitigating flows into the already full sewers which were leaking into their streams and rivers. Such an undertaking relies not only on one big project, but on a multitude of smaller successes. Verdantas has been working with the City for over a decade, initially in reviewing private sector plans for upgrading detention and infiltration opportunities, to working with the City for the identification and design of City projects for the same purpose.
{id=61570585105, createdAt=1639074811145, updatedAt=1685454602779, path='clifty-creek-power-plant-intake-modification', name='Clifty Creek Power Plant Intake Modification', 1='{type=string, value=Clifty Creek Power Plant Intake Modification}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=investigation of the hydraulic, thermal, and sediment dynamics within a cooling water intake forebay on the Ohio River, including both 3D numeric and physical modeling}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=60, name='316(b) Compliance', order=11, label='316(b) Compliance'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=3, name='316(b) Compliance', order=2, label='316(b) Compliance'}, {id=4, name='Intakes', order=3, label='Intakes'}, {id=30, name='Hydropower', order=29, label='Hydropower'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=6, name='Field Study', order=5, label='Field Study'}, {id=11, name='Sediment Modeling', order=10, label='Sediment Modeling'}]}', 39='{type=string, value=clifty-creek-power-plant-intake-modification}', 8='{type=string, value=
In order to meet screen velocity requirements of the Clean Water Act 316 b rule, American Electric Power has investigated the possibility of replacing the Clifty Creek Power Plant traveling water screens with an array of cylindrical wedgewire screens in the cooling water intake forebay. The site on the Ohio River experiences significant siltation, and there were concerns about associated vulnerability of the wedgewire screens.
Alden performed flow modeling to evaluate this possibility, and provide possible solutions. The model scope included river flow both upstream and downstream of the intake structure and flow within the intake structure. To model the geometric details of the system accurately, a field survey conducted by Alden was performed prior to the flow modeling efforts. The flow study included 2D and 3D numeric modeling, as well as scale physical modeling.
}', 13='{type=image, value=Image{width=2000,height=683,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Clifty-Creek/Clifty-Creek-Site-Visit.jpg',altText=''}}', 14='{type=string, value=Field survey conducted prior to model testing}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=30}'}
{id=61570585134, createdAt=1639074811210, updatedAt=1646949435898, path='train-station-ventilation-system-design', name='Train Station Ventilation System Design', 1='{type=string, value=Train Station Ventilation System Design}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how CFD modeling was used to show compliance with specifications and code requirements for a major New England rail station.}', 5='{type=list, value=[{id=19, name='Government', order=4, label='Government'}, {id=20, name='Transportation', order=5, label='Transportation'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=22, name='Ventilation', order=21, label='Ventilation'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=train-station-ventilation-system-design}', 8='{type=string, value=
Background
The South Station Transportation Center (SSTC), located in Boston, Massachusetts, consists of a train terminal, regional bus terminal, and a public parking garage. Currently the bus terminal and parking garage are located above the south portion of the train platforms. The section of the tracks and platforms between the north end of the SSTC and the head house, which ranges in length from about 365 to 525 feet, is currently uncovered and open to the atmosphere.
The Boston South Station Project proposed to build high rise structures and to expand the bus terminal over the existing platform areas of South Station. In effect, the development will fully enclose the station tracks and platforms with the exception of the south “portal” area and the east edge of the development along Track 13.
Work Performed
Three locomotive/track arrangements were modeled to provide a representation of the “worst case” conditions with respect to the collection of the main and HEP engine diesel exhausts and cooling fan flows.
The efficacy of multiple exhaust hoods were evaluated to meet target health and safety standards while trains were parked at idle at the head end of the tracks. Specifically, the analyses were performed to ensure that the proposed track exhaust and general ventilation systems were able to maintain safe levels of train engine emissions concentrations and ambient air temperature while the trains were parked and idling in the station.
Project Evolution
1990 Alden initially provided the design for track exhaust hoods to remove diesel products from the ventilation systems to achieve safe levels. Design work was proved out through the use of physical scale modeling, chosen for its cost effectiveness
2005-2008 Alden provided the initial ventilation design for the high rise overbuild construction project
2017-2018 Following the reboot of the projct, Alden evaluated multiple scenarios to develop and finalize a robust ventilation system that could handle a variety of station situations.
Visualization of the Computational Model [below] shows the transient locomotive through station to show thermal and pollutant capture.
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{id=61570585135, createdAt=1639074811213, updatedAt=1646949438149, path='smelter-pot-room-roof-ventilation-system', name='Smelter Pot Room Roof Ventilation System', 1='{type=string, value=Smelter Pot Room Roof Ventilation System}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how a CFD study ensured that a roof vent modification did not increase pot room temperature levels beyond safe levels}', 5='{type=list, value=[{id=17, name='Industrial', order=2, label='Industrial'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=22, name='Ventilation', order=21, label='Ventilation'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=smelter-pot-room-roof-ventilation-system}', 8='{type=string, value=
An existing roof vent arrangement was allowing rainwater to enter the Pot Room. Alden supported efforts to develop a roof vent geometry to eliminate the intrusion of rain water. The purpose of the CFD study was to ensure that the roof vent modification did not increase pot room temperature levels beyond specified limits for workers in the plant.
To evaluate the existing and proposed Pot Room arrangements, thermal and fluid flow profiles in the immediate vicinity of the pots were determined based on air flows through the plant floor and wall mounted vents. The detailed CFD model was developed from plant drawings to include all major basement, pot room and roof venting geometries. The surrounding ambient environment was included with quiescent atmospheric conditions and average ambient temperature. Thermal losses form the pots to the pot room air and from the pot room to the environment were included in the analysis. The results of the CFD modeling showed that the proposed modification to the roof venting arrangement was acceptable and would not increase the temperature in the worker-occupied spaces by more than 2 degrees F.
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{id=61570585106, createdAt=1639074811148, updatedAt=1685454625336, path='plant-mcdonough-intake-modification', name='Plant McDonough Intake Modification', 1='{type=string, value=Plant McDonough Intake Modification}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=CFD and physical model study to assist in the evaluation of a solution to reduce the sediment accumulation. }', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=4, name='Intakes', order=3, label='Intakes'}, {id=30, name='Hydropower', order=29, label='Hydropower'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=11, name='Sediment Modeling', order=10, label='Sediment Modeling'}]}', 39='{type=string, value=plant-mcdonough-intake-modification}', 8='{type=string, value=
Plant McDonough, owned and operated by Southern Company, has
experienced excessive siltation at the makeup water intake. The intake uses cylindrical wedgewire
screening within an intake originally designed for much larger, once-through
cooling water flows. Flow modeling was performed to provide a viable passive
solution to reducing the sediment accumulation at the intake. To model the
geometric details of the system accurately, a field survey was performed prior
to the flow modeling efforts. The flow study included both CFD modeling and
scale physical modeling.
For this investigation, Alden developed a
1:20 scale live bed physical model. This
model was extremely well tuned to reproduce the behavior of bed load
sediment. Even with the very fine
crushed walnut shell particles, however, it was challenging to reproduce the
behavior of suspended load. The use of a
high fidelity CFD model, therefore, proved extremely useful for this project,
in that suspended load is generally very accurately tracked with CFD models,
which are not well validated for bed load simulation. By using the two together, the two extremes
of sediment transport are captured, and developing a solution that covers this
range has a high likelihood of success.
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{id=61570585117, createdAt=1639074811172, updatedAt=1681936094078, path='using-turbine-survival-models-and-existing-data-to-understand-the-impacts-of-hydropower-projects-on-an-endangered-species', name='Endangered Species Impact: Turbine Survival Models', 1='{type=string, value=Using Turbine Survival Models and Existing Data to Understand the Impacts of Hydropower Projects on an Endangered Species}', 33='{type=number, value=0}', 34='{type=list, value=[{id=11, name='Natural Resources & Environmental Planning', order=5, label='Natural Resources & Environmental Planning'}]}', 4='{type=string, value=Using Turbine Survival Models and Existing Data to Understand the Impacts of Hydropower Projects on an Endangered Species}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=111, name='Fish Passage Design, Modeling & Testing', order=62, label='Fish Passage Design, Modeling & Testing'}, {id=112, name='Fish Protection Design, Modeling & Testing', order=63, label='Fish Protection Design, Modeling & Testing'}]}', 6='{type=list, value=[{id=17, name='Fish Passage', order=16, label='Fish Passage'}, {id=18, name='Fish Protection', order=17, label='Fish Protection'}, {id=30, name='Hydropower', order=29, label='Hydropower'}, {id=31, name='Environmental Engineering', order=30, label='Environmental Engineering'}]}', 7='{type=list, value=[{id=5, name='Desktop Analysis', order=4, label='Desktop Analysis'}]}', 39='{type=string, value=using-turbine-survival-models-and-existing-data-to-understand-the-impacts-of-hydropower-projects-on-an-endangered-species}', 8='{type=string, value=
A major component of an Atlantic salmon population model developed by NMFS is the survival of smolts and kelts passing downstream at hydropower projects. To obtain this information, NMFS contracted Alden to estimate downstream passage survival of Atlantic salmon smolts and kelts at 15 hydroelectric projects on Maine’s Penobscot River and its tributaries. These desktop survival estimates focus on direct mortality attributable to passage at dams and to multiple dam passage. An established turbine blade strike probability and mortality model was used to estimate direct survival of fish passing through turbines at each project. Survival rates for fish that pass downstream over spillways or through fish bypass facilities were estimated based on existing site-specific data or from studies conducted at other hydro projects with the same or similar species. Most of the projects included in the study have upstream passage facilities for anadromous species (river herring, American shad, and/or Atlantic salmon), as well as operating downstream bypasses for juvenile and adult outmigrants. Some of the projects have installed narrow-spaced bar racks or overlays to reduce fish entrainment through turbines.
The results of Alden’s survival analysis provided data in a level of detail that would have been extremely expensive and difficult to accomplish with field studies. Typically, turbine passage survival studies conducted in the field only evaluate one or two turbines operating at one or two gate settings (i.e., flow rates). The methods and model developed for NMFS for Atlantic salmon on the Penobscot River are transferable to other river systems and species. The theoretical model for predicting strike probability is applicable to most species and the blade strike mortality data for rainbow trout are considered representative of many other species.
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{id=61570585118, createdAt=1639074811174, updatedAt=1651603393078, path='fish-survival-in-fish-return-systems-at-cooling-water-intakes', name='Fish Return Survival at Cooling Water Intakes', 1='{type=string, value=Fish Survival in Fish Return Systems at Cooling Water Intakes}', 33='{type=number, value=0}', 34='{type=list, value=[{id=11, name='Natural Resources & Environmental Planning', order=5, label='Natural Resources & Environmental Planning'}]}', 4='{type=string, value=Alden performed two years of laboratory evaluations on factors affecting larval fish survival in fish return systems at cooling water intake structures}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=60, name='316(b) Compliance', order=11, label='316(b) Compliance'}, {id=111, name='Fish Passage Design, Modeling & Testing', order=62, label='Fish Passage Design, Modeling & Testing'}, {id=112, name='Fish Protection Design, Modeling & Testing', order=63, label='Fish Protection Design, Modeling & Testing'}]}', 6='{type=list, value=[{id=3, name='316(b) Compliance', order=2, label='316(b) Compliance'}, {id=17, name='Fish Passage', order=16, label='Fish Passage'}, {id=18, name='Fish Protection', order=17, label='Fish Protection'}, {id=30, name='Hydropower', order=29, label='Hydropower'}, {id=31, name='Environmental Engineering', order=30, label='Environmental Engineering'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=8, name='Laboratory Testing', order=7, label='Laboratory Testing'}]}', 39='{type=string, value=fish-survival-in-fish-return-systems-at-cooling-water-intakes}', 8='{type=string, value=
The Electric Power Research Institute (EPRI) has funded laboratory studies at Alden on the biological efficacy of fine-mesh screens for safely collecting larval and juvenile fish. However, little information existed on the effects of fish return systems on larval or early juvenile survival. Alden performed two years of laboratory evaluations on factors affecting larval fish survival in fish return systems at cooling water intake structures (CWISs). The project provided the additional data necessary to determine the overall biological efficacy of larval fish collection and return systems. The study was designed to evaluate the effects of velocity, drop height, length, drops and bends on larval fish survival through a fish return system.
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Working on behalf of the Potentially Responsible Party Group (the Group), including the the client, we initially provided third-party review of the Record of Decision (ROD) for the Landfill. Based on our review, Verdantas was hired by the Group to amend the remedial approach. We subsequently guided the project team through multiple Pre-Design Investigations (PDIs;see below) that were used to support a Source Control Focused Feasibility Study (SCFFS) to provide a summary of the new information from the PDIs and compare remedial alternatives. The SCFFS provided the basis to move forward with the Source Control (SC) Remedial Design and implementation. We currently interface with the regulatory agencies and acting as an intermediary in negotiations.
Achievements
NEGOTIATIONS WITH USEPA AND NHDES–Reviewed innovative remedial technologies that resulted in an Amended Record of Decision (AROD) and Explanation of Significant Difference (ESD) to document the change in remedial strategy. This allowed the PRP Group to modify the SC remedy and remove the cap requirement.
SUCCESSFULLY DESIGNED AND CONTSTRUCTED SC REMEDIAL ACTION –Completed 30 Percent to 100 Percent SC Remedial Design to implement groundwater extraction (GWE) at the toe of the Landfill to reduce contaminant migration. Observed construction and pilot testing of the 45 extraction well GWE system start-up and performed operation and maintenance activities during the initial years of operation.
FOCUSED ASSESSMENT AND REMEDIATION –Implemented PDIs in multiple areas of the site to identify a hot-spot in the Landfill to target focused remedial efforts, including soil vapor extraction and air-sparge. PDI activities included assessment of ecological impacts and sediment toxicity testing, evaluation of “hot spots” within the landfill, evaluation of the migration and fate and transport of a leachate plume downgradient of the landfill, and evaluation of potential soil vapor intrusion into nearby residences.
Scope of Services
Technical Consulting and Field Investigation Activities
Project Planning for Pre-Design Activities for Impact Delineation and Ecological Impacts
Annual Data Collection and Evaluation (from over 200 monitoring points)
Technical Support and Scope of Work Negotiations
Design and Construction Oversight and Reporting
Public Presentations
Project Details
TECHNICAL CONSULTING AND FIELD INVESTIGATION ACTIVITIES –We were part of a technical consultant team that successfully petitioned the USEPA to amend the original ROD for the Site. Based upon field investigation activities completed by the project team and subsequent negotiations with the regulatory agencies, the USEPA issued an AROD and ESD that changed the original low‑permeability landfill cap remedy to a permeable landfill cap with GWE remedy.
PROJECT PLANS FOR PDI ACTIVITIES –Based upon the AROD, we developed and implemented project plans for completing PDI activities at the Site, including a Site Management Plan (SMP), Health and Safety Plan (HASP), and Quality Assurance Project Plan (QAPP). The SMP and HASP provided guidelines for site operations, security, personal protective equipment, and site logistics. The QAPP governed how data would be collected, providing Standard Operating Procedures, data management requirements, and data validation procedures.
DESIGN AND CONSTRUCTION OVERSIGHT AND REPORTING –Verdantas provided oversight for design and performance of laboratory treatability and limited preliminary field studies confirming initial evaluation of bioremediation, air sparging, and in situ treatment trench remedial evaluations and reviewed deliverables describing the results of these studies. We reviewed design and construction of the demonstration bioremediation and air sparging treatment systems, performed oversight of its implementation, and assisted in the preparation of deliverables documenting the findings.
ANNUAL DATA COLLECTION AND EVALUATION –On an on-going basis since 2011, Verdantas manages annual monitoring requirements identified in the Revised Environmental Monitoring Program (REMP)/Groundwater Management Permit (GMP) at the landfill Site. Data collected includes annual water elevations from over 200 monitoring wells, groundwater quality data collected from approximately 50 monitoring wells, and surface water quality data collected from nearby surface water bodies. Annual activities include a review of the landfill surface to evaluate for locations of erosion and need for additional soil amendments.
TECHNICAL SUPPORT AND SCOPE OF WORK NEGOTIATIONS –We provided technical support of the Remedial Design/Remedial Action (RD/RA) Consent Decree and scope of work negotiations with the USEPA, United States Department of Justice, and NHDES. We also reviewed and evaluated a Remedial Investigation and Feasibility Study (RI/FS) to provide technical comments for the PRP Group regarding remedy design, evaluation, selection, and implementation.
QUARTERLY AND ANNUAL REPORTING –Verdantas prepares quarterly progress reports summarizing Source Control and Management of Migration groundwater extraction operational data and REMP activities. Source Control GWE system data includes total flow and annual testing of 45 extraction wells. Annual data is summarized in the Annual Remedy Performance Report that includes data validation, trend analysis, and analysis of the distribution over time.
EMERGING CONTAMINANTS –Verdantas is monitoring emerging contaminants for possible inclusion into the REMP program. 1,4-dioxane has been incorporated into the annual program and will likely be identified as a Constituent of Concern (COC) using an ESD. For PFAS evaluation, Verdantas prepared a Sampling and Analysis Plan; collected background, source area, and plume area groundwater samples to evaluate the extent of potential impact; and is currently negotiating with USEPA regarding continued monitoring approaches and requirements.
PUBLIC PRESENTATIONS –Verdantas participates in public meetings for the project on an as-needed basis and over the time of our involvement with the project (20 years), has attended and participated in numerous public meetings with the Cities, NHDES, USEPA, and members of the public. Verdantas considers public participation a fundamental component of the project and we routinely play a critical role as “translator” and “interpreter” conveying highly technical and complex investigation and regulatory information to the PRP Group, municipalities, and citizens.
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In 2012, Alden developed a report providing an updated review of the state of knowledge on fish protection technologies for use at power plant cooling water intake structures (CWISs) to meet requirements of §316(b) of the Clean Water Act (CWA). In general, power generating facilities have some flexibility in selecting fish protection technologies. The information provided in the report can be used by power generators, resource managers, and permitting agencies to determine the potential for different fish protection technologies to reduce impingement and/or entrainment losses at CWISs. Fish protection technologies are generally grouped into five functional categories—physical barriers, collection systems, diversion systems, behavioral guidance devices, and flow reduction. The performance, operational and maintenance issues, and documented installations of each technology in each functional category were described in the report. The results of the review indicated the importance of site-specific factors to the biological effectiveness and engineering practicality of a technology.
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The main objective of the study was to determine the post-collection survival of larval fish when exposed to compounding stresses of screen impingement and transfer. In particular, the project sought to determine the effects of water velocity and duration of impingement on survival. This was a multi-year, multi-phase study that included small-scale, tabletop testing along with large-scale prototype testing involving multiple species.
Survival was evaluated for impingement and entrainment of larval fish of differing sizes and species. Initial testing was done in smaller, tabletop test flumes to allow extensive replication and to help in the selection of test conditions and variables to be used in the large flume testing. Testing was then moved to a large scale flume, using three different prototypes of traveling screens. Collection efficiency and survival rates were measured for different species, fish sizes, and flow velocities.
}', 13='{type=image, value=Image{width=980,height=639,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Traveling-Screens/flume-screens-water.jpg',altText=''}}', 14='{type=string, value=Three fine mesh screens in the Alden test flume with water}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1633352516000}', 29='{type=number, value=110}'}
{id=61570585121, createdAt=1639074811182, updatedAt=1646949409305, path='st-vrain-diversion-replacement', name='St. Vrain Diversion Replacement', 1='{type=string, value=St. Vrain Diversion Structure Replacement}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=When historic floods damaged the St. Vrain Diversion Structure, a design-build team was contracted to replace the hydraulic structures as quickly as possible. Read how Alden meet the aggressive schedule.}', 5='{type=list, value=[{id=19, name='Government', order=4, label='Government'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=9, name='Water Conveyance', order=8, label='Water Conveyance'}, {id=15, name='Structural Design', order=14, label='Structural Design'}, {id=16, name='Structural Engineering', order=15, label='Structural Engineering'}]}', 7='{type=list, value=[{id=9, name='Engineering', order=8, label='Engineering'}, {id=10, name='Construction Services', order=9, label='Construction Services'}]}', 39='{type=string, value=st-vrain-diversion-replacement}', 8='{type=string, value=
The Highland Ditch Company services more than 40,000 acres of farmland. Its primary diversion infrastructure is located near Lyons, Colorado, along the St. Vrain River in Boulder County.
In September 2013, a five-day rainfall exceeded the annual average in Boulder County. The resulting flood destroyed Highland's diversion dam and headgate structure, which were built in 1870.
A design-build team was contracted to replace the hydraulic structures as quickly as possible so the system would be operational before spring runoff. The accelerated schedule was implemented so that water would be available for the 2014 irrigation season.
Alden's role included:
Hydrologic analysis
Hydraulic design
Structural engineering
Field inspections and engineering services during construction
The project design accommodated short lead times and readily available materials. Our team also developed rebar and steel shop drawings, which saved several weeks in the schedule.
The project features include:
350 cfs diversion structure with 5 headgates
Sluice structure with 2 sluice gates
70’ long diversion dam, including a grout curtain below
60’ long trash rack
More than 100’ of concrete retaining walls and wing walls
Scour protection
800’ long trapezoidal channel
This project started only weeks after the historic flood event in September 2013. Alden worked closely with the contractor to meet the aggressive schedule; construction was completed on February 5, 2014.
{id=61570585136, createdAt=1639074811215, updatedAt=1646949439650, path='wet-flue-gas-desulphurization-system-optimization', name='Wet Flue Gas Desulphurization System Optimization', 1='{type=string, value=Wet Flue Gas Desulphurization System Optimization}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how CFD and scaled physical modeling was used to evaluate the performance of the planned WFGD and designed a spray grid for the WFGD absorber to optimize SO2 removal. }', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=wet-flue-gas-desulphurization-system-optimization}', 8='{type=string, value=
A streamlined modeling approach reduced both cost and time to achieve an optimized design solution.
Williams Station Unit 1 is a 610 MW coal fired station owned by South Carolina Electric & Gas (SCE&G). The plant installed a new wet flue gas desulphurization (WFGD) system, which removes SO2 entrained in the flue gas stream. The approach of the physical flow model study was to minimize the potential for liquid pullback into the absorber inlet ducts by improving the gas flow distributions into the absorber. A parallel CFD model study was performed to optimize the spray nozzle locations and spray types to reduce high gas velocity zones and create a uniform even spray coverage across the absorber vessel to optimize SO2 removal.
Computational fluid dynamic (CFD) and scaled physical models of the planned WFGD system used velocity inlet profiles based on field data to provide better accuracy of the simulations. Modifications to the inlet ductwork and within the WFGD were made to improve the gas flow and SO2 removal efficiency. The CFD model was also used to design and optimize the spray nozzle grid and wall rings while the physical model minimized the potential for liquid pullback into the inlet ducting with designs to the inlet awning. The results of the study provided flow controls and a spray nozzle injection grid design to minimize liquid pullback while providing uniform spray coverage, which is necessary to optimize SO2 removal.
}', 13='{type=image, value=Image{width=865,height=485,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/WFGD/wet-flue-gas-desulfurization-system-physical-model.jpg',altText=''}}', 14='{type=string, value=A scaled physical model was used to evaluate the performance of the planned WFGD by simulating the gas flow distributions through the system}', 15='{type=image, value=Image{width=1200,height=600,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/WFGD/wet-flue-gas-desulfurization-system-CFD.jpg',altText=''}}', 16='{type=string, value=The CFD model was used to optimize the slurry spray patterns to maximize the removal performance.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=130}'}
{id=61570585137, createdAt=1639074811217, updatedAt=1646949441222, path='jet-mixer-performance-in-anaerobic-digester', name='Jet Mixer Performance in an Anaerobic Digester', 1='{type=string, value=Jet Mixer Performance in an Anaerobic Digester}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how a CFD model helped to confirm adequate mixing in a proposed Monogram Foods Anaerobic Digester Basin, which employs KLa's K2DJM-10 jet mixing system.}', 5='{type=list, value=[{id=17, name='Industrial', order=2, label='Industrial'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=21, name='Scale-Up', order=20, label='Scale-Up'}, {id=35, name='Bio-Pharma', order=34, label='Bio-Pharma'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=5, name='Desktop Analysis', order=4, label='Desktop Analysis'}]}', 39='{type=string, value=jet-mixer-performance-in-anaerobic-digester}', 8='{type=string, value=
A three-dimensional computational fluid dynamics (CFD) model was used to evaluate the time-averaged steady-state flow field within the Anaerobic Digester Basin.
Horizontal and vertical flow velocities within the mixing basin were provided to at select elevations within the mixing tank. The results of the CFD model demonstrated that the tank was indeed well mixed, particularly near the floor of the tank, which is critical for keeping solids well mixed, and entrained in the flow. Part of the design is to have some of the nozzles angled upward to increase mixing at higher elevations in the tank as well, which was shown to be effective in the CFD model. Velocities were presented graphically as contour plots, and elevation-averaged values were also presented.
Though not performed in this project, Alden can also include chemical and/or biological reactions in the CFD models. This can help to determine local reaction rates within the tank, concentration gradients, and what the rate-limiting factor is at any location in the tank. Time-varying simulations can also be run to study influences of different inputs in batch processes.
}', 13='{type=image, value=Image{width=1200,height=618,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/anaerobic-digester/Anaerobic-digester-CFD-nodes.jpg',altText=''}}', 14='{type=string, value=A steady-state flow field within the Anaerobic Digester Basin was evaluated with a three-dimensional CFD model.}', 15='{type=image, value=Image{width=1200,height=817,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/anaerobic-digester/Anaerobic-digester-jet-mixer-model.jpg',altText=''}}', 16='{type=string, value=Flow velocities were provided within the mixing basin to characterize the hydraulics in the basin. }', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=140}'}
{id=61570585138, createdAt=1639074811219, updatedAt=1646949442671, path='spray-dry-absorber-optimization', name='Spray Dry Absorber (SDA) Optimization', 1='{type=string, value=Spray Dry Absorber Optimization}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read about an SDA unit that was showing signs of improper droplet evaporation, and how CFD modeling was used to predict spray and deposition patterns in an SDA reactor in order to develop a solution to improve droplet evaporation.}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=spray-dry-absorber-optimization}', 8='{type=string, value=
When an SDA unit that was showing signs of improper droplet evaporation, CFD modeling was used to predict spray and deposition patterns in an SDA reactor in order to develop a solution to improve droplet evaporation.
Background
Spray Dryer Absorbers (SDAs) are designed to remove acid gases, mainly sulfur dioxide (SO2), from flue gas streams. Atomizers are used to inject droplets of lime slurry into the SDA reaction chamber, which then evaporate and react with the sulfur dioxide in the flue gas to form calcium sulfate, a solid powder that is typically captured in a fabric filter (or baghouse). Proper evaporation of the injected slurry is critical to the performance of SDA units. When the droplets do not evaporate, the system can have decreased removal performance, exhibit deposition on the walls, and cause droplet carryover into the outlet ductwork, which can then create issues with fabric filter operation.
Work Performed
A Computational Fluid Dynamic (CFD) model of the SDA reactor was used to simulate the gas and droplet flow patterns, droplet evaporation, and wall wetting due to droplet deposition. The model was validated using temperature and moisture content field data, as well as by the comparison of the predicted wall wetting to field photographs of deposition. The model predictions were incredibly accurate and provided a unique insight into the spray patterns within the reactor. Using this information, modifications to the reactor swirl vanes and outlet hood design were made to improve evaporation and mitigate wall wetting.
Results
The new reactor modifications were implemented in the field. The client has happily reported improved SDA removal performance, the elimination of deposits on the walls, no fabric filter bag wetting, and reduced operating pressure loss—all of which result in reduced SDA operating costs.
}', 13='{type=image, value=Image{width=1200,height=585,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Spray-Dry-Absorber/Spray-Dry-Absorber-modeling.jpg',altText=''}}', 14='{type=string, value=CFD modeling was used to evaluate design changes to a system in an environment where data cannot be feasibly obtained in the field.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=150}'}
In response to hurricane Katrina, the US Army Corps of
Engineers decided to increase the frontal protection on four pump stations in
the greater New Orleans area. Two of the
pump stations (Bonnabel and Duncan) required the construction of wave breaks in
Lake Pontchartrain as well as additional frontal protection in the form a
T-walls. ALDEN provided wave break
design assistance and analysis for using Computational Fluid Dynamics (CFD)
tools to evaluate wave break performance. Hydraulic performance of the discharge
flow with wave breaks and extended discharge due to the T-wall installation was
confirmed with physical hydraulic models.
3-D CFD was used to evaluate the
effectiveness of several different wave break designs for reducing the height
of the wave impacting the front of the pump station. The wave spectrum used at the model
boundaries was derived from the ADCIRC model.
Model results were used to improve the wave break design with the
objective of minimizing the structure length and maximizing wave height
reduction. The models were also used to
evaluate the potential impacts of the wave breaks on the erosion and deposition
of sediment in the pump discharge canal.
Modifications derived in the CFD models were evaluated in two 1:30 scale
physical models for final design verification.
}', 13='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Bonnabel-Duncan-Pump-Stations/bonnabel-wave-break-phsyical-modeling-testing.jpg',altText=''}}', 14='{type=string, value=Shown is the Bonnabel pump station model that was used to evaluate impacts of wave breaks}', 15='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Bonnabel-Duncan-Pump-Stations/duncan-pump-station-physical-model.jpg',altText=''}}', 16='{type=string, value=Two 1:30 scale physical models were used for final design verification produced by CFD models}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1630517031000}', 29='{type=number, value=170}'}
{id=61570585110, createdAt=1639074811157, updatedAt=1685454644666, path='meldhal-lock-and-dam', name='Meldhal Lock & Dam', 1='{type=string, value=Meldhal Lock & Dam}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=A 1:120 scale comprehensive riverine model physical of approximately 17,000 ft of the Ohio River helped to evaluate and minimize the impact of the hydropower project on navigation. }', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=2, name='Spillways', order=1, label='Spillways'}, {id=10, name='Lock', order=9, label='Lock'}, {id=30, name='Hydropower', order=29, label='Hydropower'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=3, name='Navigation', order=2, label='Navigation'}]}', 39='{type=string, value=meldhal-lock-and-dam}', 8='{type=string, value=
ALDEN conducted a comprehensive,
multi-faceted flow model study of the addition of a proposed powerhouse
(including three turbines) at the Meldahl Locks and Dam facility on the Ohio
River. Meldahl Locks and Dam are
operated by the Huntington District of the U. S. Army Corps of Engineers
(USACE) for navigation. As part of the
powerhouse design optimization, Alden studied the effect of the power house
addition on flow conditions in the approaches.
Flow patterns approaching the powerhouse were also evaluated to ensure
optimum turbine performance.
Alden designed, constructed and tested an undistorted,
1:120 scale comprehensive riverine model physical that included approximately
17,000 ft of the Ohio River. The model
was used to evaluate and minimize the impact of the hydropower project on
navigation.
In addition to the physical model, a 3D CFD model of the
powerhouse intake was coupled with a 1:40 scale model of the intake canal and
powerhouse structure to evaluate excavation requirements and ensure favorable
flow patterns at the power house intake for increased turbine life and
efficiency.
}', 13='{type=image, value=Image{width=1712,height=1368,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Meldahl-Locks-and-Dam/Meldahl-locks-dam-physical-model.jpg',altText=''}}', 14='{type=string, value=A 1:120 scale comprehensive riverine model physical of approximately 17,000 ft of the Ohio River helped to evaluate and minimize the impact of the hydropower project on navigation. }', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=180}'}
{id=61570585111, createdAt=1639074811159, updatedAt=1685454654636, path='canton-dam-aux-spillway', name='Canton Dam Aux Spillway', 1='{type=string, value=Canton Dam Aux Spillway}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=Spillway upgrades to Canton Dam took advantage of hybrid modeling using integrated numerical and physical modeling to ensure its design & safety. Read how}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=2, name='Spillways', order=1, label='Spillways'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=canton-dam-aux-spillway}', 8='{type=string, value=
The existing flood control dam at Canton, Oklahoma, was being upgraded with an auxiliary spillway to enable it to safely pass the new Probable Maximum Flood (PMF). The auxiliary spillway weir will be equipped with Fusegates, which will tip individually at predetermined water elevations to release flood water as needed. The service and auxiliary spillways together must be able to discharge a PMF of 17,000m3/s without overtopping the dam. To facilitate this, a hybrid numerical and physical hydraulic model study of the spillway system was conducted at Alden Research Laboratory.
First, a numerical model study was carried out for various approach geometry designs to investigate approach flow patterns, resulting water surface elevations throughout the reservoir and spillways, as well as flow rate splits between the two spillways. Based on the CFD results, a favorable design was selected, constructed and tested in a large-scale 1:54 scale topographic physical model. The advantage of this hybrid, integrated numerical and physical modeling approach is that each model can be used where it has its strengths: Numerous modifications of the approach channel geometry were made in a cost-effective way in the numerical model. The large-scale physical model was then used to validate the numerical results, for final modifications that brought the maximum reservoir elevation at PMF to within acceptable levels, to obtain the spillway rating curves and for Fusegate-specific tests.
}', 13='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Canton-Dam-Spillway/Canton-Dam-Spillway.jpg',altText=''}}', 14='{type=string, value=The Canton Dam spillway in Canton, Oklahoma}', 15='{type=image, value=Image{width=970,height=851,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Canton-Dam-Spillway/Canton-Dam-overlay-numerical-on-physical-model.jpg',altText=''}}', 16='{type=string, value=Overlay of the physical and numerical model results}', 17='{type=image, value=Image{width=786,height=584,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Canton-Dam-Spillway/Canton-Dam-CFD-Model.jpg',altText=''}}', 18='{type=string, value=Configuration of the Canton Dam CFD Model, with mesh detail of the auxiliary spillway and in the existing service spillway area (Run 8 shown)}', 19='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Canton-Dam-Spillway/Canton-Dam-Physical-Model.jpg',altText=''}}', 20='{type=string, value=Canton Dam undistorted 1:54 scale topographic physical model}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=190}'}
When the former Caraustar-Rittman Paperboard facility was operating at its peak, the plant was home to more than 1,200 local employees. Its closing in 2006 resulted in the loss of these jobs and left behind 300-acres of vacant real estate in the industrial core of Rittman, Ohio.
The City of Rittman (Wayne County, Ohio) now has 80 acres of prime industrial property ready for a new end user and a new 205-acre public park that will be open to visitors next year. The redevelopment of the former Caraustar-Rittman Paperboard manufacturing facility is a monumental accomplishment achieved through an ambitious public-private partnership and state funding.
This large and complicated project involved close coordination with the City of Rittman, Wayne County, JobsOhio, Team NEO, Ohio EPA, Ohio Public Works Commission, Wayne County Health Department, and the Ohio Department of Transportation. Funding assistance, a critical factor to this project’s success, was provided through a $2 million JobsOhio Revitalization Program grant and a $2.5 million Clean Ohio Conservation Fund grant.
Redevelopment and revitalization of the former Caraustar-Rittman Paperboard facility is a classic example of how a public-private partnership can provide a solution for a civic problem. Preparing this property for new industrial and commercial development is needed for the economic viability of the community. Preparing the remaining property considered less desirable from a development perspective into public open space will preserve important habitat while offering health, wellness, and educational benefits for local residents and visitors for generations to come.
{id=61570585112, createdAt=1639074811161, updatedAt=1685454662903, path='coweta-fall-kayak-course-development', name='Coweta Falls Kayak Course Development ', 1='{type=string, value=Coweta Falls Kayak Course Development }', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=Using a 1:12 scaled physical hydraulic model, Alden tested a new whitewater course design at Coweta Falls to ensure the course would perform as designed.}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=34, name='Recreation', order=33, label='Recreation'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=coweta-fall-kayak-course-development}', 8='{type=string, value=
McLaughlin Whitewater Design Group was developing a new course at Coweta Falls on the Lower Chattahoochee River near Columbus, Georgia. McLaughlin hired Alden to build a scaled physical hydraulic model of the course to make sure it would perform as designed.
The whitewater course is part of an aquatic ecosystem restoration project involving the removal of the Eagle and Phenix Dam and the City Mills Dam and construction of a series of environmental, recreation, and aesthetic features. The overall goal of the project is to restore riverine and shoal habitat. The two dams will be removed with oversight by the Army Corps of Engineers to reveal natural whitewater rapids. MWDG plans to enhance the whitewater experience by adding a combination of grouted boulder structures, newly excavated channels, a tunable wave-shaper and upgraded river access.
The physical model study evaluated a number of proposed site modifications to be installed for optimization and enhancement of whitewater features within the river, including the installation of the tunable wave-shaper. The model was used to perform visual qualitative evaluations of the whitewater features. as well as to quantitatively track the water surface elevations throughout the model at different river flows and varying river tailwater elevations.
The model simulated the Coweta Falls portion of the river to a geometric scale of 1:12, and included a small portion of the Eagle and Phenix dam that will remain on either side of the river after the dam is removed and the two naturally formed channels within the modeled portion of the river. The proposed site modifications were also modeled including the channel entrance sills, invert sills, whitewater sills and tunable wave-shaper. The model was primarily tested at prototypical river flows ranging from 900 to 13,400 CFS, but was capable of flows of 20,000+ CFS. The model also included provisions for adjusting tailwater over the range of expected river tailwater elevations.
}', 13='{type=image, value=Image{width=1120,height=650,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Coweta-Falls-Kayak-Course/coweta-sm.jpg',altText=''}}', 14='{type=string, value=Coweta Falls during a site visit pre-construction}', 15='{type=image, value=Image{width=3008,height=2000,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Coweta-Falls-Kayak-Course/DSC_0046.jpg',altText=''}}', 16='{type=string, value=The physical model during construction}', 17='{type=image, value=Image{width=1200,height=798,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Coweta-Falls-Kayak-Course/Coweta-Falls-Model-Evaluation-2.jpg',altText=''}}', 18='{type=string, value=Evaluation the model during testing}', 19='{type=image, value=Image{width=1200,height=798,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Coweta-Falls-Kayak-Course/Coweta-Falls-Model-Evaluation.jpg',altText=''}}', 20='{type=string, value=Modifications were made to improve the hydraulics of the whitewater course}', 21='{type=image, value=Image{width=2882,height=2307,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Coweta-Falls-Kayak-Course/AdobeStock_363956433%20(1).jpeg',altText=''}}', 22='{type=string, value=Kayakers ready to enter the whitewater course installed on the Chattahoochee River in Columbus, Georgia}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=200}', 30='{type=string, value=
Video taken during a walk through of the Physical Model
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Verdantas' initial involvement with the project consisted of performing a geotechnical and environmental subsurface investigation in combination with a Phase I Environmental Site Assessment. Our versatility in providing geotechnical and environmental services, in addition to our local presence and knowledge of historic conditions throughout the City of Manchester, were valuable resources for our client. Our versatility was further displayed through our design and construction involvement, which included foundation design, environmental soils characterization and management, and construction inspection services.
Achievements
SUBSURFACE INVESTIGATIONS –Multiple phases of subsurface investigations were necessary for geotechnical design and environmental characterization due to complex conditions resulting from the historically-developed nature of the site. Verdantas used multiple drilling methods to complete the investigations based upon the conditions that included the presence of urban fill, lead-contaminated soil, buried obstructions, sloping bedrock, and other challenging features, including rotary and drive-and-wash drilling, air hammer drilling, and test pits.
GEOTECHNICAL DESIGN –The project included constructing a new multi-story hotel and a two-level parking deck. Verdantas evaluated the differing structural requirements of the two structures and designed a foundation system consisting of drilled micropiles for supporting the hotel and a subgrade reinforcement method for supporting the garage. Verdantas' consideration of the design requirements of these structures and our experience with numerous foundation systems allowed for cost effective foundation systems to be implemented. The selected foundation systems also considered environmental conditions at the site and the benefit of minimizing excess soil generation that would require costly off-site disposal.
CONSTRUCTION INSPECTIONS –Verdantas provided numerous construction inspection services that dovetailed with our geotechnical and environmental expertise. Our ability to provide simultaneous inspections benefited the project by providing (many times) a single engineer/scientist for both geotechnical and environmental inspections, which allowed for reliability, fluidity, and cost savings.
Scope of Services
Phase I ESA
Geotechnical Investigation
Environmental Investigation and Soil Characterization
Foundation Design
Cost/Feasibility Study
Environmental Soils Management Cost Estimating
Soil Management Plan
Preconstruction Survey
Coordination of Soil Excavation and Off-Site Disposal
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We were hired to initiate Phase II Comprehensive Site Assessment and Phase III Remedial Action Planning under the Massachusetts Contingency Plan (MCP) in 2012 at a 40-acre, abandoned industrial mill complex with a history of a metal/copper works in the 1800s and rubber manufacturing in the 1900s. Our work on this project since 2012 demonstrates Verdantas' technical expertise in environmental site assessment, remediation, redevelopment, and regulatory closure, coupled with our commitment to being responsive and developing long-term partnerships with our clients.
Achievements
REMEDIATED 25,000 TONS OF SOIL AND 175,000 GALLONS OF WATER– Active remediation and site-wide redevelopment was initiated in 2015 with final remedial soil excavation activities ending in early 2017. Over 25,000 tons of impacted soil was excavated and disposed off-site at permitted facilities as a part of the remedial effort and 175,000 gallons of impacted water was treated and discharged (re-infiltrated) on‑site. Oversaw post‑remediation human health risk assessment and ecological (sediment) risk characterizations that ultimately supported residential reuse of the property. Contaminants included petroleum-based solvents, dense non-aqueous phase liquids (DNAPL), plasticizers, and metals.
ACHIEVED TEMPORARY OR PERMANENT SOLUTIONS– Verdantas' site investigation work and Remedial Completion Report in 2017 supported achieving Temporary or Permanent Solutions under the MCP (“site closure”) at the eight MCP disposal sites/release areas at the property.
Construction of the Paul Revere Heritage Park began in fall 2017 and for the residential building construction began in 2018. The first multi-unit condo building had all units sold and occupied in 2019 and construction of two more multi‑unit buildings and 15 townhouses is underway.
SUCCESSFULLY REMEDIATED AND CONVERTED INDUSTRIAL LAND TO PARK:The 270 residential units in the development will generate an estimated $1 million in tax revenue for the Town annually at what was a former abandoned industrial mill complex dating back to the first development by Paul Revere in the early 1800s. Almost half of the former industrial land area is now the Town’s Paul Revere Heritage Park, offering the public with a park and historic Revere Rolling Mill and Barn adjoining a new residential community.
Scope of Services
Phase I ESA
Massachusetts Department of Environmental Protection (MADEP) Comprehensive Site Assessment (Phase II ESA equivalent)
MADEP Remedial Action Plan and Remedial Implementation Plan
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We were hired by a local developer to help navigate the complex environmental issues that were preventing the sale and redevelopment of the Mohawk Tannery property by developing a holistic approach for remediating the two abutting impacted sites (Fimbel Landfill and Broad Street Parkway Asbestos Cell) concurrently.
Achievements
AWARDED $65,000 IN BROWNFIELDS GRANT– Prepared a successful Brownfields grant application. Project wasawarded over $65,000from the New Hampshire Department of Environmental Services (NHDES).
IDENTIFIED ALTERNATIVE COST SAVING REMEDIAL SOLUTION. Due to mounting costs for implementing a solidification/stabilization (S/S) remedial option, Verdantasdeveloped an alternative plan for the use of a slurry wall to surround and encapsulate the tannery sludge and install an engineered cap system to cover over the waste enclosure.
INTEGRATED VARIOUS STATE AND FEDERAL REGULATORY PROGRAMS –Verdantas navigated federal CERCLA/Superfund regulations (for Mohawk Tannery), NHDES Solid Waste and Site Remediation rules (for Fimbel Landfill), and NHDES Asbestos Disposal Site (ADS) rules (for the Broad Street Parkway Asbestos Cell) to develop a viable cleanup alternative for the three properties – effectively creating a combined 40-acre redevelopment site with tannery sludge and asbestos waste re-located and consolidated into a 4-acre containment cell.
Scope of Services
Brownfields grant proposal preparation
Stakeholder engagement (developer, municipality, various state regulators)
Federal regulatory agency coordination
ASTM/AAI Phase I ESA
CERCLA cleanup planning
In-situ S/S bench-scale treatability study
ADS Work Plan
Remedial Design Plans
Project Details
2016: Verdantas evaluated an alternative remedial approach– The use of steel sheet piles or a slurry wall to surround and encapsulate the tannery sludge and installation of a robust cap system to cover over the enclosure was determined to be a more cost-effective remedial option over S/S.
2017: USEPA “Prioritized” the sitefor closer oversight by USEPA to fast-track remedial cleanup approvals and facilitate planned redevelopment.
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Alden designed, constructed and tested a ~1:7 Froude scale physical hydraulic model to evaluate the hydraulic performance of the Tarrant Regional Water District Integrated Pipeline Project Joint Cedar Creek Pump Station in accordance with the Hydraulic Institute Standards (HIS).
The pump station consists of six 66 inch tee screens and 7 vertical pumps, each with a rated capacity of 27 to 49.4 million gallons per day (mgd). The maximum total flow for the pump station is 277 mgd, which corresponds to all seven pumps operating. The design requires each of the seven pumps to be placed into a depressed pump can located in the wet well floor.
Work Performed
Baseline tests were conducted to evaluate the pump hydraulic performance in terms of vortex formation, swirl at the pump impeller, and the velocity distribution approaching the pump impeller. The tests were conducted at two water levels; the normal water surface elevation and the maximum pool elevation. The test results identified the presence of unacceptable dye cAre subsurface vortices emanating from the can walls.
Two design modifications were developed and evaluated each of which met the HIS acceptance criteria. The first design modification included can-wall roughness vanes at 10 degree intervals to dissipate the unacceptable vortices. The second design modification included an inverted torus dish installed on the can floor (under the pump suction) as well as shortening the existing vertical can vanes. The dish modification was selected as the preferred modification since it demonstrated the most streamlined flow entering the pump.
Project Highlights
Baseline design was an innovative combination of a traditional wet well configuration with recessed pump suction cans to minimize overall excavation costs.
Two design modifications were provided to the client that satisfied the HIS acceptance criteria and the most cost-effective design was selected.
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Alden’s engineers and biologists conducted extensive CFD modeling and biological evaluations to help the Holyoke Gas & Electric Department (HG&E) develop an effective downstream passage solution for endangered shortnose sturgeon at the Hadley Falls Station on the Connecticut River. The results of these studies produced engineering and hydraulic design criteria for an exclusion rack and downstream bypass. The CFD modeling examined flow conditions for several alternative rack designs, as well as the bypass discharge to ensure safe downstream passage of fish and minimal interference of upstream migrants trying to locate the entrance to a fish lift. Alden also developed conceptual designs and preliminary cost estimates for the preferred alternatives and conducted biological testing in a large laboratory flume with various configurations of bar racks and bypass entrance designs with juvenile shortnose sturgeon. Agency acceptance of the final design was obtained by HG&E after Alden completed a desktop analysis of total downstream passage survival using the laboratory bypass efficiency data and theoretical estimates of turbine survival.
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On startup, the air quality control system (AQCS) at Deerhaven Generating Station was not able to meet its guarantees for SO capture and reagent usage. Also, the material handling systems were not operating properly, forcing the units to shutdown. To identify and solve these problems, Alden built three scaled physical flow models to simulate the complex gas-solids interactions in each component of the Turbosorp system. The design solutions that were found during model testing were implemented in the field with great success. As a result, the Deerhaven AQCS was able to meet all the performance guarantees within its contract, and has since been host to a dry scrubbers users group as an example of how these systems should operate.
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During periods of spill, Cabinet Gorge Dam was generating total dissolved gas (TDG) concentrations in excess of water quality standards. Through a series of feasibility studies, design evaluations, retrofits and/or modifications, Alden engineers worked to help Avista Corporation meet their FERC licensing requirements for the hydroelectric project located in Idaho on the Clark Fork River.
In early studies, the Alden team performed a 1:50 scale physical hydraulic model study to investigate re-commissioning of diversion tunnels used during construction of the project as bypass tunnels to pass spill flows at lower TDG levels than are generated during spillway operation. Studies revealed that the reduction in TDG afforded by the bypass tunnels was less than originally expected.
Additional feasibility studies were conducted to evaluate two alternatives for TDG reduction. One idea was the creation of off-stream “gas stripping” channels downstream of the dam, which ultimately proved to be fish passage un-friendly. Ultimately, modification of the existing spillway crest was found to be most feasible.
Full hydraulic and structural engineering services from feasibility through design and construction have been completed for the modifications to five of the eight spill bays in order to reduce TDG. Construction plans and specifications were prepared, and documentation for submittal to FERC was produced. Alden also provided construction technical support.
In addition to the work done to reduce TDG, Alden engineers also performed several structural projects for Cabinet Gorge Dam:
A Stoplog Deployment Crane was designed and fabrication-level drawings developed for the deployment crane system for lifting 10-ton stoplogs. The steel frame was designed to allow assembly and disassembly at each of the eight spill bays. Performance specifications for the 15-ton top running hoist were also provided
The FERC Supporting Technical Information (STI) Documents were reviewed and updated for Section 6—Hydrology/Hydraulics and Section— Stability/Stress Analysis.
In further compliance measures, the development of a fish trap design in the project tailrace for the expedited transmissivity of ESA listed bull trout past the project was supported. This effort also used the 1:50 scale model for initial site selection studies. Alden also provided a fisheries and hydraulic engineering representative on a “panel of experts” who advised on the best approach for trap site selection and design. Computational Fluid Dynamics (CFD) modeling of the project tailrace was performed to confirm satisfactory location and performance of the selected trap design. The CFD model developed for the fish trap studies also confirmed compatibility of the TDG mitigation measures with the fish trap operations and to guide future development of the TDG mitigation.
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Dive in Deeper
Read more about Total Dissolved Gas at High Head Dams in this three-part blog series.
The Mathis Dam Spillway project highlights Alden’s integrated hydraulic and structural engineering services in which there was close collaboration between hydraulic modeling, hydraulic design, and structural design experts.
Alden used numerical modeling and physical modeling to evaluate the discharge capacity and pressure distribution on the surface of the Mathis Dam spillway, and as a result, Alden developed a spillway shape modification that eliminated the negative pressures on the spillway. These spillway modifications were designed and detailed and approved by FERC in May 2018.
Project Summary
Mathis Dam is an Ambursen-style dam built in 1915, using a slab-and-buttress type construction. It's Existing spillway does not follow an Ogee profile. As a result, there were concerns with negative pressures on the spillway face and the peak reservoir stage during the Probable Maximum Flood (PMF).
Alden used numerical modeling to assess potential changes in the spillway capacity and reservoir levels resulting from spillway gate replacement. Numerical modeling showed that surface pressures were low enough to lift the spillway slabs and adversely affect spillway performance.
Based on the results of the numerical modeling, a 1:15 physical model was constructed. The physical model was used to confirm negative pressure results and to develop modifications (ventilation step) to eliminate the negative pressures.
Alden provided structural design, plans, and documentation for the spillway modifications. The design was submitted to FERC and approved with no comments.
Construction for the spillway modifications is scheduled for fall 2019
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One chromatography column developer was having challenges scaling up an existing design to a larger version. Our team worked with the manufacturer using Computational Fluid Dynamics (CFD) to understand the reasons for the reduced performance. CFD modeling was used to pinpoint reduced performance when moving from existing, small scale units to upscaled columns.
In the work we peformed, we were able to validate a CFD model and calibrate porous dispersion coefficients for the existing column. Moving to the larger column, however, initial results could not be reproduced with CFD. It was found that for the upscaled column, the synthetic textile mesh that forms the boundary between the distributor and the packed bed had deformed under the packing pressure of the column, such that the distributor was pinched off, and the outer radius of the packed bed was starved of flow. Computing the deformation of this mesh around the radial rib supports—and including this effect in the CFD simulations—showed that the upscale experimental results could be reproduced. The solution was verified in subsequent experiments.
Through a recommended design change, we were able to show that the high level of performance typical of the existing column could be reproduced in the upscaled column. The improved design is also able to be packed more consistently, and operates at a lower pressure loss than the original.
}', 13='{type=image, value=Image{width=2000,height=1334,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Chromatography-Scale-Up/Chromatography-equipment.jpg',altText=''}}', 14='{type=string, value=Chromatography (the separation of chemical components) is an important aspect of a number of drug production processes. }', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=260}'}
Alden's Modeling of the Smithland Lock and Dam powerhouse project is an example of coordinated use of Computational Fluid Dynamics (CFD) and physical modeling to resolve performance, navigation, constructability and cost issues in the design of a low head hydropower project. A 1:120 scale physical model together with a two dimensional computational river and sediment transport model were used to evaluate the impacts of American Municipal Power's project on lock navigation and sediment deposition. A separate 1:60 scale physical model was used together with CFD to optimize the intake channel.
}', 13='{type=image, value=Image{width=2304,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Smithland/smithland-site-visit.jpg',altText=''}}', 14='{type=string, value=View of locks at Smithland}', 15='{type=image, value=Image{width=2304,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Smithland/smithland-site-visit-2.jpg',altText=''}}', 16='{type=string, value=Smithland Locks and Dam}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=270}'}
{id=61570585126, createdAt=1639074811193, updatedAt=1651603429222, path='lower-mississippi-river-physical-model', name='Lower Mississippi River Physical Model', 1='{type=string, value=Lower Mississippi River Physical Model at the LSU Center for River Studies}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=As a 90 ft. x 120 ft. movable bed physical model, the expanded small scale physical model is one of the largest of its kind in the world}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}]}', 37='{type=list, value=[{id=65, name='Testing & Analyzing Equipment and Components', order=16, label='Testing & Analyzing Equipment and Components'}]}', 6='{type=list, value=[{id=20, name='Coastal Restoration', order=19, label='Coastal Restoration'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}]}', 39='{type=string, value=lower-mississippi-river-physical-model}', 8='{type=string, value=
Designed to simulate the Mississippi River’s depth, sediment, and flow, the Lower Mississippi River Physical Model is used by researchers, scientists, and engineers to improve our understanding of the lowermost Mississippi River and to study how it responds to modification.
The expanded small scale physical model is constructed from 216 foam panels measuring 5 ft. x 10 ft. long. This model lives in the LSU Center for River Studies where it enables researchers to study sediment diversion projects used to divert river water and sediment to replenish and help sustain the vanishing coastal wetlands in the region.
The Lower Mississippi River Physical Model encompasses the area bounded by the Terrebonne Ridge on the west, approximately RM 175, the North Shore of Lake Pontchartrain on the north, to the Chandeleur Islands on the east, and to the 250 foot contour line in the Gulf of Mexico. The mobile bed model is a distorted scale of 1:6,000 in the horizontal direction and 1:400 in the vertical direction.
The model is nearly as large as an Olympic-size swimming pool and was constructed with a toleramce of 1mm.
The model is machined from foam blocks that are then assembled on the model support platform. Innovative construction techniques and high precision measurement techniques were developed for the model construction.
}', 9='{type=string, value=https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/ESSPM/LSU-ESSPM-Time-lapse-construction.m4v?t=1641419323771}', 13='{type=image, value=Image{width=1800,height=1200,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/ESSPM/LSU2244%20Clint%20Willson%20With%20Students%20Observer%20River%20Model.jpg',altText=''}}', 14='{type=string, value=LSU civil engineering professor Clint Willson with students observing the river model}', 15='{type=image, value=Image{width=1800,height=1200,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/ESSPM/LSU5243%20Center%20for%20River%20Studies.jpg',altText=''}}', 16='{type=string, value=The Lower Mississippi River Physical Model is based on exact parameters of the river’s physical and dynamic properties. }', 17='{type=image, value=Image{width=1800,height=834,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/ESSPM/LSU9935%20Center%20for%20River%20Studies.jpg',altText=''}}', 18='{type=string, value=As a 90 ft. x 120 ft. movable bed physical model, the ESSPM is one of the largest of its kind in the world}', 19='{type=image, value=Image{width=1500,height=576,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/ESSPM/Aerial%20Photo%20-%20CPRA%20&%20CRS.jpg',altText=''}}', 20='{type=string, value=The LSU Center for River Studies is a collaborative partnership between CPRA and LSU.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=280}', 30='{type=string, value=
The time lapse video shows how the model was constructed. The model serves as both a scientific test bed and as an exhibit.
{id=61570585127, createdAt=1639074811196, updatedAt=1668605965632, path='littoral-combat-ship', name='Littoral Combat Ship', 1='{type=string, value=Littoral Combat Ship}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Alden performed a 1:5 scale physical model study for the air intake and the uptake for one of the 2 gas turbine enclosures}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}, {id=19, name='Government', order=4, label='Government'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}]}', 39='{type=string, value=littoral-combat-ship}', 8='{type=string, value=
The Littoral Combat Ship (LCS) concept boat was studied for the U.S. Navy. The LCS is intended to operate in coastal areas of the globe, and the ship will be fast, highly maneuverable, and geared to support mine detection/elimination, anti-submarine warfare, and surface warfare, particularly against small surface craft.
Alden performed a 1:5 scale physical model study for the air intake and the uptake for one of the 2 gas turbine enclosures. The main objectives of the model study were to provide velocity distributions and pressure loss data within the intake, uptake, and enclosure as well as the mixing of the enclosure cooling air with the turbine exhaust gas and the exhaust plume flow characteristics.
}', 13='{type=image, value=Image{width=840,height=432,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Littoral-Combat-Ship/Littoral-Class-Combat-Ship.jpg',altText=''}}', 14='{type=string, value=Littoral class combat ships are a new family of modern ships for the U.S. Navy.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=290}'}
Alden performed design studies and field startup testingof PSE’s Upper and Lower Baker Dams Floating Surface Collector (FSC) systems. The FSC concept is well-suited for downstream fish passage in deep reservoirs with large variations in water level. Guide nets stretching from the water surface to reservoir bottom funnel migrant fish to the FSC, which provides attraction flow through high-flow submersible pumps. As flow is drawn into the FSC, dewatering screens funnel the fish to holding pens for transportation around the dam.
ALDEN conducted a 3-D Computational Fluid Dynamics (CFD) model study of the reservoir hydraulics, guide nets, and FSC to optimize the location, orientation, and discharge of the Upper Baker FSC. Alden then developed a physical model of a preliminary version of the FSC dewatering screens and pumps to improve pump performance and screen channel hydraulics. After construction, ALDEN provided comprehensive field startup testing of the hydraulic performance of the FSC, balanced the dewatering screens, and provided critical operations information to PSE.
{id=61570585129, createdAt=1639074811200, updatedAt=1681936122141, path='taweelah-aluminum-smelter', name='Taweelah Aluminum Smelter', 1='{type=string, value=Taweelah Aluminum Smelter}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=CFD and physical modeling studies supported the design of the new power plant at the Taweelah Smelter Project in the United Arab Emirates.}', 5='{type=list, value=[{id=17, name='Industrial', order=2, label='Industrial'}]}', 37='{type=list, value=[{id=96, name='Hydraulic Structure Engineering Design', order=47, label='Hydraulic Structure Engineering Design'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=5, name='Pump Intake', order=4, label='Pump Intake'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=taweelah-aluminum-smelter}', 8='{type=string, value=
Alden conducted CFD and physical modeling studies to support the design of the new power plant at the Taweelah Smelter Project in the United Arab Emirates.
A CFD model of the effluent aeration basin was used to simulate flow and develop modifications in order to provide uniform flow within the chambers and ensure optimum mixing.
Physical hydraulic models of the cooling tower, seawater intake, and outfall basin were used to investigate pump approach flow hydraulics. Because hydraulic phenomena which can adversely affect pump performance were found in all three station designs, design modifications were developed that provided acceptable approach flow conditions for the range of the station's operations.
}', 13='{type=image, value=Image{width=1366,height=768,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Taweelah/Taweelah-outfall-overview-iso.jpg',altText=''}}', 14='{type=string, value=Isometric View of the Outfall Model Construction}', 15='{type=image, value=Image{width=1366,height=768,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Taweelah/Taweelah-Pump-Bays-Overview.jpg',altText=''}}', 16='{type=string, value=Overview of the Pump Bays}', 17='{type=image, value=Image{width=1366,height=768,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Taweelah/Taweelah-cooling-tower.jpg',altText=''}}', 18='{type=string, value=View of the Cooling Tower Model During Testing}', 19='{type=image, value=Image{width=1366,height=768,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Taweelah/Taweelah-test-conditions.jpg',altText=''}}', 20='{type=string, value=Detail of the Model During Testing}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1630505674000}', 29='{type=number, value=310}'}
Alden designed, constructed, and tested two 1:20 scale physical hydraulic models of the new 2-mile long surge protection barrier and associated gate bypass structures that will protect the city of New Orleans from surges generated by a 100-year storm. A model of a typical section of the surge barrier was used to optimize the scour protection on the protected side of the floodwall. A model of the bypass gate, which allows ship traffic through the barrier, was tested to determine the forces acting on the gates during the storm's receedance, as well as to measure wave heights, pressure, and vibration at the gate structure during hurricane conditions. Both models utilized a wave generation system to create hurricane conditions during testing
}', 13='{type=image, value=Image{width=1021,height=680,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Inner-Harbor/Inner-Harbor-Aerial.jpg',altText=''}}', 14='{type=string, value=An aerial view of the project location}', 15='{type=image, value=Image{width=1000,height=750,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Inner-Harbor/Inner-Harbor-Mid-Construction.jpg',altText=''}}', 16='{type=string, value=One of the 1:20 scale models in mid-construction}', 17='{type=image, value=Image{width=2816,height=2112,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Inner-Harbor/Inner-harbor-model-shakedown.jpg',altText=''}}', 18='{type=string, value=1:20 scale models utilized wave generators to create hurricane conditions during testing}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=320}'}
{id=61570585113, createdAt=1639074811163, updatedAt=1685454666195, path='waller-creek-tunnel-diversion', name='Waller Creek Tunnel Diversion', 1='{type=string, value=Waller Creek Tunnel Diversion}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=Read how Alden designed, constructed and tested an undistorted 1:33 scale comprehensive physical model of the proposed storm water tunnel at Waller Creek.}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}, {id=2, name='Spillways', order=1, label='Spillways'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=waller-creek-tunnel-diversion}', 8='{type=string, value=
As part of Austin, Texas, Waller Creek has historically had problems with flooding, erosion and water quality. The addition of a proposed storm water tunnel was evaluated for hydraulic capacity, air entrainment and flow patterns in the tunnel entrances.
Testing was conducted on an undistorted, 1:33 scale comprehensive physical model of the Waller Creek Tunnel. The main morning glory spillway, two secondary spillways and the tunnel discharge were modeled. The model was used to evaluate flow patterns and flow splits approaching the morning glory spillway, the entrainment of air at the spillway and the pressure losses in the system. Modifications were derived that split the flow more evenly and improved the performance of the spillway and tunnel.
In addition to the physical model, a 3D numeric model using Flow-3D was developed to examine the flow patterns into the morning glory spillway and the flow patterns entering the tunnel from the downstream laterals. Modifications were developed in CFD and tested in the physical model to minimize the number of modifications required to the physical model to arrive at acceptable flow patterns.
}', 13='{type=image, value=Image{width=2592,height=1944,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Waller-Creek-Tunnel/Waller-Creek-Tunnel-100-years-test.jpg',altText=''}}', 14='{type=string, value=A close up of the inlet on the 1:33 scale comprehensive physical model}', 15='{type=image, value=Image{width=1200,height=800,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Waller-Creek-Tunnel/Waller-Creek-Tunnel-Inlet.jpg',altText=''}}', 16='{type=string, value=Another view of the inlet structure}', 17='{type=image, value=Image{width=1200,height=788,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Waller-Creek-Tunnel/Waller-Creek-Tunnel-Model-Outlet.jpeg',altText=''}}', 18='{type=string, value=Overview of the Waller Creek Tunnel model outlet structure}', 19='{type=image, value=Image{width=1200,height=800,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Waller-Creek-Tunnel/Waller-Creek-Model-View.jpg',altText=''}}', 20='{type=string, value=View of the physical model set up within the lab}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1630505701000}', 29='{type=number, value=330}'}
{id=61570585114, createdAt=1639074811166, updatedAt=1685454672165, path='26th-wardwaste-water-treatment-plant-upgrade', name='26th Ward Waste Water Treatment Plant Upgrade', 1='{type=string, value=26th Ward Waste Water Treatment Plant Upgrade}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}, {id=16, name='Hydrology, Hydraulics, and Fluids', order=10, label='Hydrology, Hydraulics, and Fluids'}]}', 4='{type=string, value=Design upgrades were supported by CFD model studies used to assist in evaluating the hydraulic and sedimentation performance}', 5='{type=list, value=[{id=18, name='Water', order=3, label='Water'}, {id=19, name='Government', order=4, label='Government'}]}', 6='{type=list, value=[{id=1, name='Hydraulic Structures', order=0, label='Hydraulic Structures'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=26th-wardwaste-water-treatment-plant-upgrade}', 8='{type=string, value=
To support design upgrades to the existing Primary Settling Tanks (PSTs) of the 26th Ward Waste Water Treatment Plant (WWTP) for the New York City Department of Environmental Protection (DEP), Alden conducted a Computational Fluid Dynamics (CFD) model
study to assist in evaluating the hydraulic and sedimentation performance of: 1) A new Flow Distribution Structure (FDS), 2) A new influent channel that services each PST with new ports and target baffles, and 3) New PST effluent
weirs and troughs. The study included developing three-dimensional (3D) CFD
models and conducting a series of simulations to verify flow and grit
distributions favorable for optimal performance.
A
series of FDS designs were modeled for: flow and grit distributions to
each operating tank; water surface elevations at inflow chamber of FDS; water
surface elevations upstream of the troughs; the relationship between the water
surface elevation and flow rates; and weir setting and optimization of the FDS
design. The best design was chosen for
grit and flow splits.
The PST design was modeled for flow and grit
distributions through ports using: various influent channel configurations;
flow and grit distribution within the PSTs and performance in conjunction with
the existing baffle boards, target baffles, vertical baffle wall, flow
distributors, symmetrical and asymmetrical layouts of inlet piping to influent
channel ports, downstream weirs and troughs; prediction of the water surface
elevation in the FDS compartment; and estimation of flow and grit distributions
of other PSTs. The results of the model
indicated possible design improvements, which were then implemented and tested
in the model. Afterwards, the PST weirs
and troughs were modeled in details to ensure favorable hydraulic performance.
}', 13='{type=image, value=Image{width=1249,height=855,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/26th-ward-waste-water-treatment/FDS-option-model-view.jpg',altText=''}}', 14='{type=string, value=One of the FDS designs modeled for this project}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=340}'}
As part of project/dam surrender and removal efforts at the Saccarappa Hydroelectric Project (Saccarappa), Alden provided S. D. Warren Company d/b/a Sappi North America (Sappi) with the final design and fish passage analysis for nature-like fishways in the upper channels at Saccarappa Falls. The final design involves reshaping the existing bedrock channel into a form that is more conducive to fish passage while mimicking the morphology of a natural bedrock channel. Alden provided agency consultation while developing the design and will ultimately provide construction support. The proposed design complements a proposed double Denil fishway over the lower portion Saccarappa Falls designed in partnership with Acheron Engineering.
Alden conducted a site visit and reviewed existing geotechnical, hydrologic, site constraints, and other site data prior to developing the final design for the nature-like fishways. The final design was achieved by way of iteration between a 3D CAD representation of the proposed bathymetric surface and a 3D computational fluid dynamics (CFD) model. Expected small-scale roughness of the channel bed was incorporated into the CAD surface through a novel texturizing technique based on a high resolution laser scan of the existing bedrock surface. The CFD model was used to simulate proposed conditions at four discrete design flow rates. Hydraulic data output by the CFD model (e.g., depth and velocity) informed subsequent improvements of the proposed surface in CAD. Sappi and agency review and feedback was provided at 30%, 60%, 90%, and final drafts of the design. Fish passage effectiveness of the final design was analyzed by Alden biologists and engineers using USFWS’s SMath models developed for assessing velocity impediments by estimating fatigue, survivorship, and work. Alden also provided engineering consultation and inspections to support project construction.
}', 13='{type=image, value=Image{width=2000,height=905,url='https://www.verdantas.com/hubfs/PROJECTS/Saccarappa-Falls-Nature-Like-Fishway-Design.jpg',altText=''}}', 14='{type=string, value=3D CFD modeling was used to aid in the design and evaluation of the nature-like fishway}', 15='{type=image, value=Image{width=1623,height=826,url='https://www.verdantas.com/hubfs/assets/news/saccarappa-dam-removal-iso-rendering.jpg',altText=''}}', 16='{type=string, value=CFD Modeling helped guide the engineering of two channels in the upper falls and the Denil ladder at the lower falls.}', 17='{type=image, value=Image{width=1500,height=750,url='https://www.verdantas.com/hubfs/IMAGES/Alden/Imported_Blog_Media/CFD-Nature-Like-Fishway.jpg',altText=''}}', 18='{type=string, value=CFD-based design provided an innovative approach to create the Nature-Like Fishway}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=1633352533000}', 29='{type=number, value=350}'}
{id=61650352207, createdAt=1639161143266, updatedAt=1680628474041, path='roll-over-release-of-fuel-oil-from-vehicle-accident', name='Responded to a tanker truck carrying approximately 9,500 gallons of several fuels', 1='{type=string, value=Responded to a tanker truck carrying approximately 9,500 gallons of several fuels}', 33='{type=number, value=0}', 34='{type=list, value=[{id=6, name='Environmental Assessment & Remediation', order=0, label='Environmental Assessment & Remediation'}]}', 35='{type=string, value=Insurance Carrier}', 4='{type=string, value=Remediation services for rollover accident that released 9,500 gallons of fuel oil}', 36='{type=string, value=Maine}', 5='{type=list, value=[{id=19, name='Government', order=4, label='Government'}]}', 37='{type=list, value=[{id=51, name='Remediation', order=2, label='Remediation'}]}', 39='{type=string, value=roll-over-release-of-fuel-oil-from-vehicle-accident}', 8='{type=string, value=
On January 2, a tanker truck carrying approximately 9,500 gallons of several fuels (gasoline, diesel, and No. 2 fuel oil) in separate compartments was involved in a traffic accident. The accident led to the shutdown of surrounding roads after the tanker truck was struck, rolled over and became engulfed in flames. Working in close cooperation with Maine DEP, Verdantas directed initial remedial activities between January 3 and February 12 and excavation until remedial endpoints were achieved. For this project, Verdantas coordinated initial remedial activities, and is currently performing on-going monitoring of groundwater, surface water, and residential wells. Reporting to Maine DEP has included preparation of a Sampling and Analysis Plan (SAP), an Initial Response Activities (IRA) Summary Report, and two quarterly status reports.
Achievements
FAST 24/7 EMERGENCY RESPONSE – While regional firefighters were burning off the remaining fuel, controlling the fire, and working to evacuate nearby businesses and homes, Verdantas was working alongside the Maine DEP, acting fast to minimize and assess the damage caused by the crash and fire. We immediately dispatched an oversight team, including Maine Certified Geologist to the accident site to observed conditions and record the impact area. By responding in such a short time, our onsite team of environmental experts were able to communicate with Maine DEP officials and first responders to ensure the emergency response moved as fast as possible.
PROTECTED LOCAL WELLS AND AQUIFERS – There were local water supply wells and a natural aquifer nearby that could have been impacted by the spill. These receptors were not impacts, thanks to the quick response effort.
EFFICIENT SOIL CHARACTERIZATION SAVED TIME AND MONEY – By utilizing real time data, our team was able to effectively assess the overall area of soil that had been impacted by the crash and fire. Furthermore, through the application of efficient soil characterization techniques, we were able to identify soil that was unaffected and did not require site removal. The methods provided in our Sampling and Analysis Plan (SAP) minimized the time required for site assessment, additionally minimizing remediation costs and overall site impact. The SAP included Data Quality Objectives for soil and water sampling. The data quality objectives for soil samples were established to evaluate the extent (vertical and lateral) and magnitude of petroleum impacts in soil from the release; and evaluate the effectiveness of the soil excavation remedial response action. Soil samples were collected from both the soil excavation and from soil borings.
1,025 GALLONS OF LIQUID WASTE COLLECTED FOR DISPOSAL – Initial Response and Remedial Actions consisted of deploying sorbent booms and pads on liquid petroleum and near culvert entrances and outfalls, extinguishing active fires, and removing pooled petroleum product using a vacuum truck.
2,113.63 TONS OF IMPACTED SOIL WERE EXCAVATED – Verdantas oversaw soil excavation activities between January 3, 2019, and February 12, 2019, by ACV Enviro (ACV) of Skowhegan, Maine. Approximately 2,113.63 tons of impacted soil were excavated and transported from off-site for disposal. The soil excavation was conducted mostly within the right-of-way for Route 12 and Depot Road. Verdantas coordinated the field work with the Maine Department of Transportation (Maine DOT). Challenges encountered during remedial work included encountering three culverts during excavation activities that required the removal and replacement of the culverts.
PROACTIVELY MANAGED HEALTH AND SAFETY – Verdantas prepared a site-specific Health and Safety Plan (HASP) for the project. A signed copy of the HASP was maintained by the field staff on-site during monitoring activities.
Scope of Services
Conducing an emergency response to a 9,500 gallon spill of multiple petroleum fuels (gasoline, diesel, No. 2 fuel oil) from a tractor-trailer tanker truck vehicle accident;
Working in close cooperation with the Maine Department of Environmental Protection and the Maine Department of Transportation to investigate and remediate the spill;
Communicating with private property owners to conduct investigation and remedial actions;
Excavating over 2,000 tons of petroleum-impacted soil adjacent to a state highway;
Collecting confirmatory post-excavation samples for comparison to Maine regulatory criteria;
Collecting water samples from nearby private water supply wells and surface waters for laboratory analysis;
Installing monitoring wells and collecting groundwater samples to evaluate for potential groundwater impacts; and
Completing regulatory response actions and obtaining regulatory closure for the spill.
Project Details
REMEDIATION GUIDELINES FOR PETROLEUM CONTAMINATED SITES IN MAINE – Verdantas followed guidelines listed in the Remediation Guidelines for Petroleum Contaminated Sites in Maine (published December 1, 2009, amended May 23, 2014) to establish soil sampling locations and laboratory analyses.
FIELD SCREENING OF SOIL SAMPLES UTILIZING PHOTOIONIZATION AND FLAME-IONIZATION DETECTORS – During excavation activities soil samples were collected in triplicate and screened in mylar bags pursuant to the Maine DEP guidance document Field Screening of Soil Samples Utilizing Photoionization and Flame-Ionization Detectors (revised April 17, 2015).
COMPENDIUM OF FIELD TESTING OF SOIL SAMPLES FOR GASOLINE AND FUEL OIL (STANDARD OPERATING PROCEDURE: TS004) – Soil samples were collected for oleophilic dye testing and PID field screening pursuant to MEDEP’s guidance document Compendium of Field Testing of Soil Samples for Gasoline and Fuel Oil dated October 15, 2012.
MAINE DEP REMEDIAL ACTION GUIDELINES (RAGS) – Verdantas used PID measurements to delineate the extent of impacts and soils above 40 ppmv were subsequently excavated pursuant to Maine DEP guidance. Post remedial soil samples were collected at an appropriate frequency and submitted for laboratory analysis of volatile petroleum hydrocarbons (VPH) fractions and target analytes and extractable petroleum hydrocarbons (EPH) by Massachusetts Department ofEnvironmental Protection (MADEP) Methods. Soil analytical data were compared to applicable Maine DEP Remedial Action Guidelines (RAGs).
ANALYSIS OF VPH FRACTIONS AND TARGET ANALYTES AND EPH BY MADEP METHODS – Verdantas performs groundwater, surface water and residential well sampling. For monitoring well sampling groundwater is purged using a peristaltic pump, disposable polyethylene tubing, and low-flow sampling techniques. Field parameters are measured during purging, and the groundwater samples were collected when the field parameters stabilized. Verdantas collected the surface water samples using disposable polyethylene bailers. Groundwater and surface water samples were transferred to pre-cleaned laboratory containers and stored on ice for delivery to the Alpha under chain of custody for laboratory analysis of VPH fractions and target analytes and EPH by MADEP Methods.
PRIVATE WELL SAMPLING – Prior to sampling, tap water was purged from the piping for approximately 10 minutes to allow for stabilization and an evaluation was performed to identify that at one property a chlorination system and carbon filtration system was in use, and sampling was performed directly from the supply well.
{id=61570585116, createdAt=1639074811170, updatedAt=1681936090799, path='nuclear-power-facility-flow-monitoring-feasibility-study-and-dye-dilution-field-flow-measurement', name='Flow Monitoring Feasibility Study and Dye Dilution Field Flow Measurement', 1='{type=string, value=Nuclear Power Facility Flow Monitoring Feasibility Study and Dye Dilution Field Flow Measurement}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Field testing of pump performance was used to help determine feasibility of and recommended technology to monitor cooling water intake flow rates.}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}, {id=18, name='Water', order=3, label='Water'}]}', 6='{type=list, value=[{id=5, name='Pump Intake', order=4, label='Pump Intake'}]}', 7='{type=list, value=[{id=6, name='Field Study', order=5, label='Field Study'}]}', 39='{type=string, value=nuclear-power-facility-flow-monitoring-feasibility-study-and-dye-dilution-field-flow-measurement}', 8='{type=string, value=
Starting in 2009, Alden has been working with a confidential nuclear power facility to determine the feasibility of monitoring cooling water intake flow rate. The work began with a feasibility study of available equipment and/or techniques that can be used to monitor the intake flow rate. A comprehensive list of available technologies that can be used to monitor intake flows was developed, along with brief descriptions of each technology. The list of available technologies or methods that were generated was evaluated to determine those feasible for implementation at the facility. Detailed assessments of the technologies selected for further evaluation were then conducted and were provided along with listed advantages and disadvantages associated with implementation. Alden then recommended a technology believed to be best suited for use at the facility compared to the other technologies further evaluated.In support of the feasibility study conclusions,
Alden has conducted pump performance testing in 2012, 2013, 2014, and 2015. A total of 10 circulation water pumps have been tested using the dye dilution method to determine flow rate. By injecting a known amount of dye upstream, and allowing for sufficient mixing, the dye concentration downstream will yield the flow rate (mass balance calculation). The dye dilution testing was conducted to determine the actual circulating water flow rates at different pump speeds and tidal conditions in order to address environmental regulatory questions about water usage.
{id=62145707585, createdAt=1639754043986, updatedAt=1680628534685, path='bartrams-mile', name='Bartram’s Mile', 1='{type=string, value=Bartram’s Mile}', 33='{type=number, value=0}', 34='{type=list, value=[{id=6, name='Environmental Assessment & Remediation', order=0, label='Environmental Assessment & Remediation'}, {id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 35='{type=string, value=Philadelphia Industrial Development Corporation (PIDC), the Philadelphia City Planning Commission and the City of Philadelphia Department of Commerce}', 4='{type=string, value=Environmental, geotechnical, structural and civil engineering for Bartram's Mile. }', 36='{type=string, value=Philadelphia, PA}', 5='{type=list, value=[{id=16, name='Real Estate', order=1, label='Real Estate'}, {id=19, name='Government', order=4, label='Government'}]}', 37='{type=list, value=[{id=49, name='Site Assessment', order=0, label='Site Assessment'}, {id=51, name='Remediation', order=2, label='Remediation'}, {id=83, name='Site Engineering', order=34, label='Site Engineering'}, {id=85, name='Structural Design', order=36, label='Structural Design'}, {id=89, name='Coastal Engineering', order=40, label='Coastal Engineering'}, {id=114, name='Geotechnical Engineering', order=65, label='Geotechnical Engineering'}]}', 39='{type=string, value=bartrams-mile}', 8='{type=string, value=
The Master Plan for the Lower Schuylkill River District is a blueprint for sustainable redevelopment of the industrial corridor along the east and west banks of the Lower Schuylkill River in Philadelphia. This public-private initiative was led by the Philadelphia Industrial Development Corporation (PIDC), the Philadelphia City Planning Commission and the City of Philadelphia Department of Commerce, with funding from the William Penn Foundation, the City of Philadelphia, and EPA Brownfield Grants.
“Bartram’s Mile,” a keystone of the Master Plan, is one mile of river frontage along the western banks of the Tidal Schuylkill between Grays Ferry Avenue and 58th Street. This portion of the Schuylkill River was cut off from public access for decades, thus representing an opportunity to not only link to Bartram’s Garden, the Schuylkill River Trail, and the 58th Street Greenway, but also add two new parks to be community assets for years to come.
Verdantas was the lead environmental consultant to the PIDC and Philadelphia Parks and Recreation in support of the Master Plan; specifically, the remedial design and cleanup oversight of two targeted Brownfield properties that flank Bartram’s Gardens to the north and south. These EPA Brownfield sites, Bartram North and Bartram South, are former bulk oil terminals that received product by barge and rail and stored millions of gallons of oil on-site. Soils and groundwater at these sites were significantly impacted by petroleum. With Verdantas' oversight, both sites have since received Act 2 liability protection for environmental conditions. In addition to environmental consulting services, Verdantas provided geotechnical, structural, and civil engineering services in connection with stormwater management, the assessment of the structural stability of an on-site dock, construction of a shade structure at Bartram South, and a FEMA floodplain analysis. Bartram’s Mile opened in April 2017 providing the community a space for walking, biking, running and bird watching.
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{id=61570585139, createdAt=1639074811221, updatedAt=1646949444436, path='quench-system-design-flue-gas-cooling', name='Quench System Design for Flue Gas Cooling', 1='{type=string, value=Quench System Design for Flue Gas Cooling}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how Alden used prior experience with spray header system design, as well as CFD simulations to evaluate various quench system designs for a coal fired power station.}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}, {id=7, name='Technical Analysis', order=6, label='Technical Analysis'}]}', 39='{type=string, value=quench-system-design-flue-gas-cooling}', 8='{type=string, value=
Clay Boswell Energy Center Unit 4 is a coal fired station owned by Minnesota Power. The plant had a need to reduce flue gas temperatures upstream of their NID emissions control system for removing SO2 from the flue gas stream—while the plant remained online. This created a design limitation for the injection system since the nozzles would have to fit through the duct ports, and the lances would only be supported by the duct penetration, not internally.
Our engineers calculated the quench water requirements to achieve the desired gas temperature cooling and then selected candidate spray nozzles for the system. The sulfuric acid dewpoint temperature was also calculated for design considerations. Remaining above the acid dewpoint is important to avoid corrosion of the ductwork. Then a computational fluid dynamic (CFD) model of the scope of ductwork was created, and prepared using inlet boundary conditions representative of the plant flue gas profiles. Based on the desired gas flow pattern for optimal spray injection, required residence time for evaporation, and access in the field to the ductwork for lance installation and quench system piping, a location for the quench system was selected. The candidate spray nozzle injection characteristics, such as droplet size distribution, spray pattern, and droplet velocity, were input into the model and used to evaluate various nozzle arrangements. The final arrangement provided the target gas temperature reduction, within the desired uniformity, and minimized wetting of surfaces.
ALDEN worked closely with plant personnel to design a quench system that could be installed while the plant remained online · ALDEN used CFD modeling to simulate numerous quench spray nozzles types and arrangements to determine the best option · ALDEN designed a cost-effective functional design for the quench system
{id=61570585141, createdAt=1639074811226, updatedAt=1646949449057, path='premature-bag-wear-in-fabric-filter', name='Solving Premature Bag Wear in a Fabric Filter', 1='{type=string, value=Solving Premature Bag Wear in a Fabric Filter}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how a CFD model of a complete fabric filter system helped a plant eliminate premature bag wear and minimize ash deposition.}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=premature-bag-wear-in-fabric-filter}', 8='{type=string, value=
Shiller Station, a 150 MW coal and oil fired station owned by Public Service Company of New Hampshire, was experiencing high bag wear in their fabric filter (FF) unit that was causing unscheduled outages for repair. Using computational fluid dynamic (CFD) modeling to simulate the ash laden gas flow through the fabric filter system, causes of the bag wear were identified, and modifications were developed to stop the issue. The plant has installed the recommended flow controls, and have reported that not only is the bag wear issue resolved, they also gained over 1-inwg of pressure savings from the modifications.
Work Performed
Using a CFD model of the complete fabric filter system, including connecting ductwork, inlet and outlet manifolds, and each FF compartment with bags, the cause of the high bag wear rate was identified—poor gas flow distributions in the inlet manifold and entering each compartment. Modifications were developed to create more uniform gas velocities through the inlet ductwork and entering each compartment, and to reduce the gas velocity magnitude impacting the bags. The final design created smooth flow throughout the connecting ductwork and manifolds. The design also eliminated the high velocity jets that were impinging on the bags.
Results
The plant has reported that they are no longer experiencing premature bag wear and ash deposition in the ductwork has been minimized. As a result of this modification, the plant also reported a gain of over 1-inwg due to the pressure loss savings.
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{id=61570585142, createdAt=1639074811228, updatedAt=1646949450778, path='electrostatic-precipitator-performance-optimization', name='Electrostatic Precipitator Performance Optimization', 1='{type=string, value=Electrostatic Precipitator Performance Optimization}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how a scaled physical model was used to simulate the planned ESP upgrades to design performance devices and optimize the ESP system}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}]}', 39='{type=string, value=electrostatic-precipitator-performance-optimization}', 8='{type=string, value=
Our team and Air Consulting Associates (ACA) were was contracted by Southern Environmental Inc. (SEI) for the planned Electrostatic Precipitator (ESP) upgrades for a large US utility. Our team performed the upfront physical flow model studies while ACA proivded technical support throughout the entire project.
An ESP operates by electrically charging ash particles in the fluegas and then attracting the charged particles onto collecting plates which are then rapped to send the ash to the hoppers where it can safely be removed from the system. For optimum system operation, the distribution of the gas velocity must be very uniform entering the ESP to maximize the collection efficiency of the ESP and to minimized particulate emissions. Upstream duct fallout of ash particles and the flue gas distribution into the ID fans are also important components of ESP operation that must be considered to inhibit premature outages.
Work Performed
Physical flow modeling techniques were used to develop and optimize duct and ESP flow controls and ash handling devices to achieve best performance targets for ash removal. The connecting ductwork from the existing air preheaters to the rebuilt ESPs were also included in the studies to provide flow controls designs to optimize air preheater performance. The model simulated the field gas velocities, pressure losses, and ash particulate transport and removal.
Results
Not only did we design a cost-effective design for the flow controls and perforated plates to provide optimal ash removal, our recommended design achieved the ICAC EP-7 targets for uniformity of flue gas velocities at the inlets to the first collecting fields and at the outlets of the last collecting fields to maximize particulate removal efficiency
Each of the three units passed their respective performance test guarantees after the recommendations from the physical flow model had been implemented.
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{id=61570585143, createdAt=1639074811230, updatedAt=1646949452564, path='selective-catalytic-reduction-system-design', name='Selective Catalytic Reduction (SCR) System Design', 1='{type=string, value=Selective Catalytic Reduction System Design}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how computational and scaled physical modeling simulated the planned SCR and helped design performance devices to optimize the NH3:NOx, fluegas velocity, temperature, ash, and pressure losses through the SCR system. }', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=1, name='Physical Modeling', order=0, label='Physical Modeling'}, {id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=selective-catalytic-reduction-system-design}', 8='{type=string, value=
Alden simulated the planned Kansas City Power and Light Iatan Unit 2 (POWER Magazine’s 2011 plant of the year) Selective Catalytic Reduction Systems (SCR) to maximize the NOx removal efficiency. An SCR operates by injecting a reagent, typically ammonia (NH3), into the flue gas stream, and then catalyzing a reaction to convert the NO2 and NO3 into nitrogen and water. For optimum system operation, the distribution of the NOx, reactant, gas velocity, and temperature must be very uniform entering the catalyst to maximize the reaction and prolong catalyst life. Upstream collection of large particle ash (LPA), and the distribution of fine ash at the inlet face of the first catalyst are also important components of SCR operation that must be considered to inhibit premature outages caused by pluggage.
Work Performed
Physical and computational flow modeling techniques were used to develop and optimize duct and SCR flow controls, ammonia injection grid, mixing devices, and ash handling devices to achieve best performance targets for NOx removal. The new connecting ductwork from the retrofit SCR to the existing air preheaters was also included in the study to provide flow controls designs to optimize air preheater performance. The models simulated the field gas velocities, temperatures, pressure losses, NOx concentrations, NH3 injections, and ash particulate transport and removal.
}', 13='{type=image, value=Image{width=600,height=399,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Selective-Catalytic-Reduction-System-Design/KC-Power-and-Light-Iatan-Unit-2.jpg',altText=''}}', 14='{type=string, value=The Selective Catalytic Reduction Systems (SCR) for the Kansas City Power and Light Iatan Unit 2 (POWER Magazine’s 2011 plant of the year) was simulated to maximize the NOx removal efficiency.}', 15='{type=image, value=Image{width=3456,height=2305,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Selective-Catalytic-Reduction-System-Design/KC-Power-and-Light-Iatan-Unit-2-physical-model-2.jpg',altText=''}}', 16='{type=string, value=A combination of computational and scaled physical modeling was used to simulate, design, and optimize the operating performance of the SCR system}', 17='{type=image, value=Image{width=630,height=429,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Selective-Catalytic-Reduction-System-Design/KC-Power-and-Light-Iatan-Unit-2-CFD-model-2.jpg',altText=''}}', 18='{type=string, value=Recommended design achieved the target uniformity of NH3:NOx, gas temperature, and gas velocity at the first catalyst layer to maximize removal efficiency}', 19='{type=image, value=Image{width=3456,height=2304,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Selective-Catalytic-Reduction-System-Design/KC-Power-and-Light-Iatan-Unit-2-physical-model.jpg',altText=''}}', 20='{type=string, value=A cost-effective design for the AIG and SCR systems provided optimal NOx removal and catalyst life}', 21='{type=image, value=Image{width=2048,height=1536,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Selective-Catalytic-Reduction-System-Design/KC-Power-and-Light-Iatan-Unit-2-design.jpg',altText=''}}', 22='{type=string, value=An upstream ash collection device was developed to remove large particle ash, which is known to cause catalyst pluggage, and simulated the distribution of expected fine ash entering the first catalyst layer, which showed uniform loading.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=640}'}
{id=61570585144, createdAt=1639074811233, updatedAt=1646949453904, path='utility-power-flue-gas-reheat-system-design', name='Utility Power Flue Gas Reheat System Design', 1='{type=string, value=Utility Power Flue Gas Reheat System Design}', 33='{type=number, value=0}', 34='{type=list, value=[{id=10, name='Civil Infrastructure', order=4, label='Civil Infrastructure'}]}', 4='{type=string, value=Read how Alden redesigned a heat recovery system for a power plant exhaust system and confirmed performance goals with CFD}', 5='{type=list, value=[{id=15, name='Energy', order=0, label='Energy'}]}', 37='{type=list, value=[{id=98, name='Gas Flow Modeling & Design', order=49, label='Gas Flow Modeling & Design'}]}', 6='{type=list, value=[{id=19, name='Gas Flow', order=18, label='Gas Flow'}, {id=22, name='Ventilation', order=21, label='Ventilation'}, {id=23, name='Pollution Control', order=22, label='Pollution Control'}]}', 7='{type=list, value=[{id=2, name='Numerical Modeling', order=1, label='Numerical Modeling'}]}', 39='{type=string, value=utility-power-flue-gas-reheat-system-design}', 8='{type=string, value=
Marsulex Environmental Technologies (MET) contracted Alden to re-engineer a heat recovery system for flue gas reheat at Great River Energy Coal Creek Generating Station. The goal of the system was to ensure that no condensation would be present in the flue gas system as it enters the stack and vents to ambient conditions. The reheat was provided through the use of multiple available heat sources within the existing facility. A Computational Fluid Dynamics (CFD) Model Study was also peformed to simulate the operation of the system.
With the available heat from various locations in the plant analyzed, our flow experts designed the final system to remove ambient air from the boiler house and to heat that air through contact with the economizer ductwork prior to the re-heat fans. Two separate CFD models—that included convective and radiative heat transfer—were then used for final evaluation of the design. The first model included the Reheat Air System and Wet Flue Gas Desulfurization inlet ductwork. The second model was for the reheat ducting and mixing chamber, in which the reheated air mixed with the flue gas.
CFD results showed that the project goals for pressure drop, temperature rise, and mixing of ambient air with flue gas were all met.
}', 13='{type=image, value=Image{width=1200,height=585,url='https://20952198.fs1.hubspotusercontent-na1.net/hubfs/20952198/PROJECTS/ALDEN/Utility-Power-Flue-Gas-Reheat-System-Design/Utility-Power-flue-gas-reheat-design-cfd.jpg',altText=''}}', 14='{type=string, value=The performance goals of a redesigned heat recovery system for a power plant exhaust system were confirmed with CFD.}', 25='{type=number, value=0}', 27='{type=number, value=1}', 28='{type=number, value=0}', 29='{type=number, value=650}'}
Clay Boswell Station Unit 4, a 535 MW coal fired station owned by Minnesota Power, planned to retrofit a new SO2 removal system, and needed design through flow modeling to ensure successful operation of the system. Alden used a scaled physical flow model to simulate coal ash deposition in the connecting ductwork and distribution manifold of the planned emissions control system. A modification to the manifold ductwork and new internal flow controls were developed to mitigate areas of ash piling. The plant installed the recommended flow controls and has experienced no major ash piling.
Work Performed
Alden developed a scaled physical model of the planned emissions control system and associated ductwork. The model used velocity inlet profiles based on field data to improve the accuracy of simulations. Initial tests identified one area in particular where high levels of ash deposition were observed in the distribution manifold. Duct modifications and flow control designs were investigated to mitigate the deposition. The final design eliminated the ash deposition.
Results
After several months of operation with the recommendations implemented, plant personnel conducted a walkdown of the system and confirmed that the ductwork and distribution manifold were free of ash piling.
Project Highlights
The testing simulated ash transport and deposition in a scaled cold flow model
A cost-effective design for the DFGD inlet ducting system was provided
Plant feedback after operation confirmed the recommendations were effective
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{id=61650352050, createdAt=1639157355674, updatedAt=1646949480734, path='on-call-environmental-and-consulting-services-for-city-of-philadelphia', name='On-Call Environmental and Consulting Services for City of Philadelphia', 1='{type=string, value=On-Call Environmental and Consulting Services for City of Philadelphia}', 33='{type=number, value=0}', 34='{type=list, value=[{id=6, name='Environmental Assessment & Remediation', order=0, label='Environmental Assessment & Remediation'}]}', 35='{type=string, value=Department of Public Property}', 4='{type=string, value=On-Call environmental engineering services for the City of Philadelphia Department of Public Property}', 36='{type=string, value=Philadelphia, PA}', 5='{type=list, value=[{id=16, name='Real Estate', order=1, label='Real Estate'}, {id=19, name='Government', order=4, label='Government'}]}', 37='{type=list, value=[{id=49, name='Site Assessment', order=0, label='Site Assessment'}]}', 39='{type=string, value=on-call-environmental-and-consulting-services-for-city-of-philadelphia}', 8='{type=string, value=
Verdantas has provided a wide range of environmental consulting services on an as-needed basis to the City of Philadelphia since 2014 and prior to that from 2001-2005. Working with the Department of Public Property required interaction with numerous agencies within the City, such as the Philadelphia Zoo, Parks and Recreation, the First Judicial District (Courts), the Philadelphia Redevelopment Authority, the Streets Department, the Water Department, and the Department of Commerce. With our cost-conscious, practical approach toward managing projects and solving problems, along with our talented team of engineers and scientists, over 400 work orders were completed during the recent contract. The Department of Public Property recently selected Verdantas to continue to provide environmental consulting services for the period of 2018 through 2021.
{id=61662719489, createdAt=1639168684577, updatedAt=1679597743149, path='hazardous-building-materials-materials-characterization-and-abatement-work-plan', name='Hazardous Building Materials Characterization and Abatement Work Plan', 1='{type=string, value=Hazardous Building Materials Characterization and Abatement Work Plan}', 33='{type=number, value=0}', 34='{type=list, value=[{id=7, name='Environmental Health & Safety', order=1, label='Environmental Health & Safety'}]}', 35='{type=string, value=Educational Institution}', 4='{type=string, value=Hazardous building materials characterization and abatement work for large-scale renovation and demolition project}', 36='{type=string, value=Boston Area}', 5='{type=list, value=[{id=16, name='Real Estate', order=1, label='Real Estate'}]}', 37='{type=list, value=[{id=58, name='Regulatory Compliance Audits/Reporting', order=9, label='Regulatory Compliance Audits/Reporting'}]}', 38='{type=string, value=Education Client}', 39='{type=string, value=mao-welsley-hazardous-building-materials-materials-characterization-and-abatement-work-plan}', 8='{type=string, value=
At the outset of the project, we assisted with the various aspects of managing a large-scale renovation and demolition project. Demonstrating Verdantas' versatility, our services for this education sector client ranged from planning and completing a hazardous building material survey, to preparing comprehensive characterization reports and work plans to guide abatement activities over a 5-year period.
Achievements
DATA GAP ANALYSIS –The first step in the project was to compile the existing asbestos survey and abatement data to prepare a database of testing results to evaluate what media needed testing to plan abatement activities. This step reduced the number of samples for testing.
HAZARDOUS MATERIAL CHARACTERIZATION REPORTS –The project included coordinating a hazardous building material survey and identification of laboratory decontamination requirements based upon historical use. We prepared two Work Plans for different portions of the Science Center to identify impacted building materials, project sequencing, and contractor responsibilities for bidding purposes. We partnered with Environmental Health, Inc. to provide Project Monitoring (PM) services during abatement.
SOIL STABILZATION AT FORMER GREENHOUSE– During demolition of the former Greenhouse complex lead-impacted soil required stabilization to render the soil non-hazardous before excavation and disposal. We prepared the Soil Management Plan, oversaw stabilization activities, and collected confirmatory soil samples.
ASBESTOS OPERATION, MONITORING AND MAINTENANCE (OMM) PLANS –At completion of the renovation project, we prepared OMMs Plans for two portions of the building where asbestos containing materials (ASCM) not abated. The plans identify the location of ACM and provide management guidelines to minimize the potential for exposure.
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