Rapid Infiltration Basins

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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than most older northeastern cities when addressing confined sewer overflow issues that are typical of aging and outdated underground infrastructures.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.

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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.

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