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11/d4/94 12-46 V619 453 2888 GROUNDWATER 'TECH 444 CONCORD REG 06004/008 <br /> Harlin Knoll <br /> September 23, 1994 <br /> Page 4 <br />' samples collected from the oll supply/used oil line excavation are presented in Table 2 A summary <br /> of the CAM metals analytical results is presented in Table 3 Copies of the laboratory reports for all <br />' samples are presented in Appendix 3, <br />' 25 Soil Characterizatlon <br /> Groundwater Technology personnel field screened excavated loll with a PID, using headspace <br /> methodologies The contractor segregated dean and impacted soil and stockpiled Impacted soil on <br /> plastic sheeting as directed by Groundwater Technology personnel Sod was segregated based on <br /> visual observations and PID field screening results. Any sod above 10 ppm on the PID or Visually <br /> stained by hydrocarbons was stockpiled_ Gasoline-impacted so4 (approximately 4 cubic yards) was <br /> stockpiled separately from the used-oil-Impacted soil (approximately 2 cubic yards) Both stockpiles <br /> were sampled for disposal/treatment and securely covered with plastic Both stockpiles remain on <br /> site pending removal for treatment. The analytical data for the stockpiled soil is presented in <br /> Appendix 4. <br /> 3.0 SUMMARY OF FINDINGS <br /> win points summarize Groundwater Technology's findings at Sears Stare 1288 iii Stockton, <br /> The following <br /> California <br /> ■ On August 10 through 12, gasoline product piping and the dispenser islands were <br /> removed. Gasoline hydrocarbons in the soil were detected beneath the south end of the <br />' eastern dispenser island, and in the product line trench west of the western dispenser <br /> island Hydrocarbon concentrations ranged from 1 8 to s 8 mg/kg <br />' ■ Analytical results from sol samples collected from the oil supply/used on line excavation <br /> indicated there was petroleum hydrocarbon impact (9 mg/kg to 480 mg/kg total oil and <br /> grease) to the soil <br /> p.-.etc-de concentrations of 2-3 and 1 3 micrograms per kilogram of 4,4-DDE and 4,4-1301), <br /> respectively, were detected In sample W02-3 5 <br />' a eased upon field screening and observations, excavated sons were segregated Non- <br /> impacted soils from the gasoline product and used oil line excavations were used as <br /> backfill at the site, while approximately 4 cubic yards of gasoline-impacted son and 2 yards <br /> of used-oil-impacted sol remain on site pending removal for treatment. <br /> GROUNDWATER <br /> Saws#1288 819GkOn []� TECHNOLO N <br />