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^::L.. ,..,.e• '.S n <br /> 22-September 2000 ; <br /> . 'AGE-NC,Pro'ectNo..95-0109' <br />' Page 2 of ;• ; <br /> Immediately upon.retrieval, the samples were transferred into-40-ml EPA-approved VOA vials. <br /> I ; containing 0:5inl 18%hydrochloric acid'as a sample preservative:The samples were labeled;stored - <br /> ori ice, and transported in,a chilled container,;under.chain-of-custody, to McCampbell Analytical, <br />' Inc. (MAI); a-State .of California Department of.Health Services (DHS)-certified analytical <br /> laboratory..A11-.'samples:were analyzed for: - <br />' •. 'Total petroleuiri hydrocarbons quantified as gasoline.(TPH-g) in accordance with EPA <br /> Methods 5030/8015m; „ <br /> •- Volatile aromatic-compounds: benzene, ,toluene, ethylb.enzene and xylenes (BTEX)"and <br />' methyl tertiary-butyl ether(MTBE) in accordance with EPA method 8020/602; and <br /> Fuel oxygenates: di=isopropyl ether (RIPE),.ethyl tertiary-butyl ether (ETBE),"MTBE; <br /> tertiary-amyl methyl ether (TAME).and tertiary bi tanol (TBA) in accordance with EPA,; <br /> Method 8260m. <br /> Sam p les'collected from MW-9 and MW-14were also transf&red into one-liter amber bottles without <br /> . p <br /> added preservative. These samples were transported-to A. Keith Kaufman in Culver City.,and <br /> analyzed for physicochemical properties and microbiological enumeration: ., <br />' . 23. . SURVEYING .. <br /> The well head,(top'of casing),elevation.of each wc1l.installed for the Geweke investigation was re-, <br /> surveyed relative'to;City'of,'Lodi Bench Mark ##' 3:On126 April,2000; a:California;state�licensed <br /> survey engirieer frorri Baumbach&Piazza,Inc. surveyed a reference point on the top of each ground <br /> water monitoring wel,La.fth ' site to the'nearest 0.01400t relative'to the-City of Lodi Bench Marks <br /> and Description at,53:28 feet,above mean sea level`(msl): The results.of the monitoring,well survey ., ' <br /> are contained in Table"l.'.The'surveying report (Baunibach &.Piazza) is presented in Appendix C: " <br /> 3.0: ;: FINDINGS <br /> r r <br /> I . <br /> Groundwater elevation and flow directionYwere'calculated from.field data; hydrocarbon-impact to �7 <br /> groundwater was inferred from laboratory analysis of the ground,Water'samples r • ' <br /> 3.1 GROUND WATER GRADIENT AND DIRECTION` <br /> The.depth to;groundwater ranged,from 49.38 feet bsg north of the site to 52.14•feet'bsg,s6uth of the ' <br /> site during the 3,une•2000 monitoring event. Groundwater elevation in each well was determined by I.; <br /> 4 <br /> Advanced Ge6Environinental,Inc. <br />