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F r i 22 August 2000 AGE-NC Project No 95-0144 Page 4 bf 8 field data and logs are included in Appendix B All purged water was stored in 55-gallon DOT- approved drums on-site 2 3 COLLECTION OF GROUND WATER SAMPLES r I, The depth to water was remeasured nrlmediately following purging in each well to gauge the ' recharge rate and to assure a minnnum of 80 percent recharge prior to sampling Water samples were collected from each purged well using new disposable bailers Samples were transferred into 40-m1 z EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and into 1-liter amber bottles without preservative The samples were labeled,,stored on ice and transported under chain-of-custody to McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified analytical laboratory Each sample was analyzed for TPH-g, TPH-d and TPH-mo in accordance with EPA Methods 503018015, and ' e BTEX and methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 8020/602 Samples collected from wells MW-19A, MW-19B MW-20A,IMW-20B, MW-21A and MW-21B were also analyzed for lie MTBE, TBA, DIPS, ETBE and TAME and other significant volatile organic compounds by EPA Method 8260 Modified r ' 3.0 FINDINGS Ground water elevation and flow direction were calculated from field data, hydrocarbon-impact to ground water and soil was inferred from laboratory analysis of the ground water samples ' 13 1 ANALYTICAL RESULTS C,F SOIL SAMPLES TPH-g was detected in two of the three samples analyzed from soil probe boring 15B-6 at ' concentrations of 2,800 milligrams per kilogram(mg/kg) at 6 feet bsg and 13,000 mg/kg at 10 feet bsg The sample at 15 feet bsg in boring 15B-6 was lion-detect for TPH-g Samples 15B-9-6, 15B-9- 10 5B-9-6, 15B-9- 10 and 15B-9-15 contained concentrations of TPH-g ranging from 6 1 mg/kg to 8,500 mg/kg, with concentrations increasing with depth , lie , Advanced GeoEnvironinental,Inc