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concentration of acetone at 0 022 mg/kg was detected in a verification sample <br /> ' collected at the bottom of the final excavation at the eastern edge of the <br /> former K-3 compressor pad, two low concentrations of acetone ( 0 047 and <br /> ' 0 064 mg/kg) and a low concentration of TPH as diesel (1 5 mg/kg) were <br /> detected in samples collected from the former K-4 area excavation All <br /> additional verification samples collected from the former compressor pad <br /> ' area did not contain detectable concentrations of target compounds and the <br /> area was backfilled with clean fill <br /> In addition, based on results of the previous investigation, soil was removed <br /> ' from the footprint of the former hazardous materials storage area to a depth <br /> of approximately three feet Soil samples were collected and analyzed by a <br /> ' mobile laboratory during soil removal activities to determine the extent of <br /> excavation Three of the nine verification samples collected in the final <br /> excavation sidewalls contained low concentrations of acetone ranging from <br /> ' 0 075 to 0 086 mg/kg, one of the nine verification samples contained a low <br /> concentration of TPH as diesel at 2 4 mg/kg <br /> 1 <br /> ' Approximately 76 cubic yards of soil was removed during the November 1996 <br /> field event The excavated soil was hauled offsite for treatment to TPS <br /> ' Technologies, Inc , located in Richmond, California Copies of manifests for <br /> the excavated soil are presented in Appendix B Following soil removal, the <br /> ' former hazardous materials storage area was backfilled with clean fill <br /> ' <br /> CURRENT INVESTIGATION <br /> R 1 <br /> t <br /> To address the extent of chemical impact to soil and to investigate the <br /> potential impact of ground water at the site, POI and its representatives <br />