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S E C 0 R <br /> Conceptual Site Model <br /> Chevron Service Station#9-6171 <br /> March 25, 2005 <br /> Page 28 <br /> samples collected beneath the sewer lines ranged from below the method detection limits <br /> to 0 54 mg/kg <br /> Between September 1990 and April 1991, soil samples were collected dunng the <br /> installation of eight additional groundwater monitoring wells PCE was detected In five of <br /> these samples The concentrations of PCE at 15 feet, 30 feet, and 50 feet bgs were 2 6 <br /> ppm, 0 33 ppm, and 2 3 ppm, respectively <br /> In mid-1990, a soil gas Investigation was conducted along the sewer line around LVSC by <br /> Tracer Research Corporation (TRC) Forty-four samples, collected at depths ranging from <br /> 5 feet to 14 feet bgs, were collected and analyzed In more than 10 locations, PCE was <br /> detected at concentrations ranging from 0 0005 µg/L to 1,000 µg/L In fewer than 10 <br /> locations, TCE was detected at concentrations ranging from 0 001 pg/!_ to 11 µg/L At two <br /> locations, 1,1,1-trichloroethane (TCA) was detected at concentrations ranging from 004 <br /> µg/L to 0 05 µg/L <br /> 6.7.3 Remediation History <br /> The following actions were taken to remediate the area <br /> • PCE spills at the site have been limited through updating the dry-cleaning system, <br /> Installing a sealed concrete floor, and cleaning up spills before any PCE has the <br /> opportunity to discharge Into the onsite sewer drains All hazardous substances are <br /> drummed and removed from the site at least every 90 days by a licensed waste <br /> hauler <br /> • LVMD Well 1 was removed from service temporarily until the groundwater samples <br /> from this well exhibited non-detectable levels of volatile organic compounds This <br /> well was officially closed in 1992 During Its hiatus, a polyvinyl chloride liner was <br /> instal <br />