PA Turnpike Stormwater Evaluation + Improvements

At the Pennsylvania Turnpike Commission (PTC) Homewood Maintenance Facility, field observations identified that stormwater and vehicle wash water was entering the underground storage tanks (UST) piping and sump areas for the existing gasoline and diesel dispenser station for the facility. It was determined that this issue was related to the elevation of the existing concrete fuel pads with respect to the surrounding asphalt pavement around the dispenser station. In addition to the pad elevations, the lack of existing drainage features to convey flow away from the dispenser area also contributed to drainage problems at the site. This condition resulted in significant flooding and sediment accumulation near the dispenser area during small rain events.

As part of the fueling station upgrades at PTC Homewood, Rhea was tasked by the PTC and GAI Consultants, Inc. to oversee the UST removal and subsurface sampling, complete a stormwater evaluation and subsequent design of the proposed stormwater conveyance system, and conduct an existing conditions and as-built survey of the site.

Rhea performed an initial site evaluation and on-site meeting with PTC, GAI, the Pennsylvania Department of Environmental Protection (PADEP), the tank removal contractor, and the stormwater installation contractor. Rhea oversaw the removal of the two existing tanks and installation of two 12,000-gallon tanks, piping, and dispensers. Rhea sampled, profiled, and reported on the results of the soil and water testing from the tank excavation areas per the PADEP Form U Residual Waste Code 508. After the tank removal and new installation was complete, Rhea performed hydrologic and hydraulic (H&H) analysis for the site, including pre- and post-construction drainage delineation and a soils analysis. Rhea used the results of the H&H analysis to design the culvert and inlet system and prepared a stormwater basis of design report for review and approval from the PTC.

Rhea also coordinated with the PTC, GAI, PADEP and New Beaver Borough regarding stormwater management ordinances, on-site meetings, permitting regulations, and coordination with the tank removal contractor for design specifications. Once design was complete, Rhea conducted on-site construction inspection during installation of the stormwater drainage system and prepared an as-built drawing for the PTC.

After construction was complete, an as-built survey and record drawings were drafted for the PTC

Services: Water Resources Engineering , Land Surveying + Mapping

Industries: Transportation