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Interim Remedial Action, BP/ARCO Federal Way, WA

Image2In September 2013, ARCO Retail commenced work to upgrade fuel dispenser and product piping at a Federal Way property. The shutdown of the station provided an excellent opportunity to expand the work to include contaminant mass reduction in the zone beneath the dispenser islands. As part of a Technical Services Agreement between ARCO and the Washington Department of Ecology, INNOVEX directed an Interim Remedial Action to remove hydrocarbon contaminated soil in the vicinity of the pump islands.

Site upgrade activities associated with removal of the fuel dispensers and product piping began by disconnecting the electrical power to the turbine pumps in the USTs and the fuel dispensers, removing the fuel dispensers, and flushing the product lines to remove residual fuel remaining in the lines. Following removal of the fuel dispensers and product piping, INNOVEX directed over-excavation of 818 tons of hydrocarbon-impacted soil in the vicinity of the fuel dispensers, dispenser islands, and product piping lines that was then transported off-site for disposal at CEMEX’s Everett facility.
Soil samples were collected to confirm the presence or absence of hydrocarbons in soil and to characterize soils remaining in place at the outer edges and floor of the excavation and beneath fuel dispenser locations adjacent to the canopy support columns.

Upon the completion of sampling, new product, conveyance piping, and electrical conduit were installed. Taking advantage of the open excavation, three vapor and one groundwater remediation points were also installed. The remaining backfill, compaction and surface restoration activities were completed and wellheads were installed at ground surface.
Overall, the interim action removed over 800 tons of petroleum contaminated soil and installed four new remediation points in the vicinity of the pump islands. This work allowed for a much greater efficiency and effectiveness in locating and installing new remediation points adjacent to dispensers. Overall, this rapid and opportunistic approach offered the potential to reduce cleanup timelines by up to two years.