PWGC upgraded petroleum storage facilities and associated fueling systems at six bus depots owned by GTJ, Inc., in order to comply with federal, state, and NYC regulations for UST and AST systems. The systems lacked overfill and corrosion protection, and/or leak detection range in capacity from single 275-gallon tanks to multiple manifold systems with combined capacities of 10,000 gallons.
PWGC developed a cost effective approach to manage the project. Using Geoprobe® technology to perform soil sampling and characterization during the design phase of the project, allowed for a speedy determination of the extent of petroleum-contaminated soil (PCS). The delineation of PCS determined the amount of excavation required prior to construction, which prevented delays during construction due to sampling and lab analysis. PWGC implemented a comprehensive program for the facilities’ upgrade within a strict schedule.
PWGC conducted site investigations and provided comprehensive engineering design and construction services at:
- Varsity Transit, Inc, Jackson Heights NY
- Triboro Coach Corp, Jackson Heights, NY
- Green Bus Lines, Jamaica, NY
- Green Bus Lines, Rockaway, NY
- Jamaica Bus Company, Jamaica, NY
- Command Bus Company, Brooklyn, NY
Thirty (30) underground storage tanks (USTs) were removed from the site in the spring of 1999. As part of the tank closure action, removal of contaminated soil was also performed; approximately 3,000 tons of petroleum contaminated soil was disposed of off-site and a combined 5,000 gallons of water and light non-aqueous phase liquid (LNAPL) was removed from the open UST excavations.
While efforts were made to remove petroleum contaminated soil during the UST removal project, endpoint samples revealed that residual petroleum contaminated soil remained at or near the water table. In an effort to further remediate the site, a remedial system was designed and installed to recover LNAPL at the site. The remedial system was comprised of a combination of pumping wells and LNAPL recovery wells. Contaminated groundwater was treated utilizing a shallow tray air stripper and discharged through diffusion wells on-site. LNAPL was recovered utilizing pneumatic skimmer pumps. In addition, LNAPL was recovered utilizing a high-viscosity Magnum Spill Buster in site groundwater monitoring wells containing LNAPL.
Since the facilities operate 24 hours a day, 365 days a year, maintaining operation during construction was a critical aspect of the project. PWGC’s approach minimized the disruption of operations and saved the client money and time.