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28 April 2000 • AGE-NC Project No. 95-0109 Page 2 of 4 2.2. COLLECTION OF GROUND WATER SAMPLES The depth to water was remeasured after purging to ensure a minimum of 80 per cent recharge prior to sampling. 80 per cent recharge was not obtained in MW-3 prior to sampling. Water samples were collected from each purged well using disposable plastic bailers. Immediately upon retrieval, the samples were transferred into 40-m1 EPA-approved VOA vials containing 0.5ml 18%hydrochloric acid as a sample preservative. The samples were labeled, stored on ice, and transported in a chilled container, under chain-of-custody, to McCampbell Analytical, Inc. (MAI), a State of California Department of Health Services(DHS)-certified analytical laboratory. All samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Methods 5030/8015m; • Volatile aromatic compounds: benzene, toluene, ethyibenzene and xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA method 80201602; and • Volatile organic compounds with fuel oxygenates: di-isopropyl ether(DIPE), ethyl tertiary- butyl ether(ETBE), MTBE, tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) in accordance with EPA Method 8260/8260m. Samples collected from MW-7, MW-8, MW-9, MW-12, MW-13, MW-14 and EW-1 were also analyzed for volatile halocarbons in accordance with EPA Method 601. Samples collected from MW-9 and MW-14 were also transferred into one-liter amber bottles without added preservative. These samples were transported to A. Keith Kaufman in Culver City and analyzed for physicochemical properties and microbiological enumeration. 3.0. FINDINGS Ground water elevation and flow direction were calculated from field data; hydrocarbon-impact to ground water was inferred from laboratory analysis of the ground water samples. 3.1. GROUND WATER GRADIENT AND DIRECTION The depth to ground water ranged from 49.81 feet bsg north of the site to 52.40 feet bsg south of the site during the March 2000 monitoring event. The ground water elevation in MW-14 did not match the surrounding data. Also the change in ground water elevation was nearly a foot greater than in the surrounding wells. Data from MW-14 does not appear to be accurate and was therefore not used to • create the ground water elevation map. Data from the remaining wells indicates an average 0.73-foot Advanced CcoEnvironmental,Inc.