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i <br /> 27 April 2003 <br /> • AGE-NC Project No 96-0235 <br /> Page 4of8 <br /> water analyzer Field sheets and data are included in Appendix C Purged water was stored on-site <br />' in labeled, 55-gallon DOT-approved drums <br /> 23 Collection and Analysis of Ground Water Samples _ <br /> 1 , <br /> Water samples were collected from each purged well using new disposable plastic bailers after <br />' allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative and into 1-liter amber bottles without preservative After collection,the samples were <br />' properly labeled, placed in a, chilled container and `transported under chain-of-custody to <br /> `McCampbell Analytical, Inc (MAI), a State of California Department of Health Services (DHS)- <br /> certified analytical laboratory, and were analyzed for I ' <br />' • TPH-g and TPH-d in accordance with EPA Method 8015M, <br /> • BTEX and the fuel additives DIPE, ETBE,MTBE, TAME, TBA, methanol, ethanol, EDB <br />' and 1,2-DCA In accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br />' Soli stratigraphy, ground water elevation and flow direction were inferred from field data, <br /> hydrocarbon-impact to ground water was quantified by laboratory analysis of the ground water <br /> samples <br /> 31 STRATIGRAPHY <br />' <br /> In general,s approximately silt was encountered from a roximatel 5 feet to 10 feet bsg Silty to poorly graded fine <br /> sand with silt were encountered from approximately 10 feet to 25 feet bsg <br /> Between approximately 25 feet and,40 feet bsg,distinct llthologies°were observed-iri soil bonngs <br /> MW-14B, located east of the former UST cluster area, and MW-15B, located southwest of the <br /> iformer UST cluster area, Silty to fat clay was observed in soil boring MW-14B Silty to poorly <br /> graded fine to coarse sand was encountered in soil boring MW-15B <br />' Between approximately 40 feet and 65 feet bsg, silty to fat clay was encountered in both borings <br /> Underlying the clay was a clayey to poorly graded fine to medium sand, encountered between <br />' approximately 60 feet and 70 feet bsg <br /> Advanced GeoEnvironmental,Inc <br />