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i i I I i 29 June 1999 . AGE-NC Project No 97-0290 iPage 4 of 7 55 dissolved oxygen meter Field sheets and data are included in Appendix D Purged water was istored on-site in labeled, 55-gallon DOT-approved drums i i2 6 COLLECTION OF GROUND WATER SAMPLES i The depth to ground water was measured in each well following purging to measure well recharge A minimum of 80% recharge was observed in each well, except MW1, prior to sampling Approximately 65 percent recharge was observed In MW 1 after approximately 1 5 hours Water i samples were then collected using new disposable plastic bailers Each water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and into one-liter amber bottles After collection, the samples were properly labeled, placed In a chilled icontainer and transported under chain-of-custody to AAL i2 7 LABORATORY ANALYSES OF GROUND WATER SAMPLES i . Ground water samples were analyzed for • TPH-g and TPH as diesel (TPH-d) in accordance with EPA Methods 5030 and 8015m, i • BTEX with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 60218020, and i • Oxygenated compounds (di-isopropyl ether [DIPS], ethyl tertiary-butyl ether [ETBE], MTBE, tertiary-amyl methyl ether [TAME] and tertiary butanol [TBA]) in accordance with EPA Method 8260 Modified I i28 SURVEYING On 11 January 1999,the casing elevations of wells MW I through MWS were surveyed to the nearest i0 01-foot relative to mean sea level as established at a City of Lodi Bench Mark (Table 7) On 14 June 1999, the casing elevations of MW6, MW7, MWS, VW1, SWI and SW2 were surveyed to the i nearest 0 01-foot relative to mean sea level Surveying was performed by Baumbach& Piazza, Inc The survey report sheets are included in Appendix C i i Advanced GeoEnvironmentsl,Inc i