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Site Conceptual Model October 3, 2002 <br /> ARCO Facility No 6100 <br /> 5 REMEDIAL ACTIONS <br /> Soil removed during construction activities in 1990 was separated into stockpiles and sampled by <br /> Roux Associates Excavated soil impacted with petroleum hydrocarbons was transported to <br /> BFI's landfill in Livermore, California, for disposal The quantity of petroleum hydrocarbon <br /> impacted soil removed from the site is not currently known <br /> Resna conducted a soil vapor extraction pilot test in October 1991 Extracting from wells VW-1 <br /> through VW-4, Resna was able to generate a vacuum up to 10 inches of water column in well <br /> V-2 while extracting from well VW-3 at a rate of 98 cubic feet per minute with 43 inches of <br /> water column During the test, influent vapor concentrations ranged from 130,000 milligrams <br /> per cubic meter (Mg/M3) to 160,000 mg/m3 The estimated radius of influence was 35 feet under <br /> these conditions <br /> Delta excavated approximately 315 tons of petroleum hydrocarbon impacted soil from beneath <br /> the former product dispensers and piping on January 23, 2002 The perimeter of the excavated <br /> areas are included on a figure presented in Appendix C The soil was transported to Forward <br /> Landfill In Manteca, California, for disposal <br /> Free product was first bailed from well MW-1 September 28, 2000 A passive skimmer was <br /> installed in the well on October 3, 2000 The passive skimmer was removed and active bailing <br /> of the product once each week was initiated on January 3, 2001 Approximately 56 gallons of <br /> free product have been removed from well MW-1 since product removal was initiated in <br /> September 2000 Weekly removal of free product is currently ongoing A table documenting <br /> historical free product removal from well MW-1 is included in Appendix D <br /> Lateral conveyance piping, for future use In soil vapor extraction, was installed during site <br /> renovation activities in January and February 2002 Lateral conveyance piping has been <br /> connected to wells VW-1, VW-3, VW-4, VW-6, VW-7, VW-8, VW-11 through VW-14, <br /> VW-16, and MW-2 through MW-9 The conveyance piping was stubbed up at the northwest <br /> corner of the property to be manifolded for connection to an SVE system at a later date <br /> P 1Bp-Arco for URS161001Reports16100 SCM doe Page 11 Stratus <br />