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1 ' 122 February 2000 . AGE-NC Project No 95-0103 Page 2 of 4 2 2 ' GROUND WATER SAMPLE COLLECTION Water samples were retrieved from each purged well using new disposable bailers The samples were ' transferred into 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative The samples were transported in a chilled container under cham-of-custody to McCampbell Analytical, Inc (MAI) a state-certified laboratory in Pacheco, California for chemical laboratory analyses-Samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA ' Method 8015 Modified, • Volatile aromatic compounds benzene,toluene,ethyl-benzene and total xylenes(BTEX)and methyl-tert-butyl ether(MTBE),in accordance with EPA Method 8020 and • Oxygenating fuel additives tertiary butyl alcohol (TBA), dl-isopropyl ether(DIPE), MTBE, ethyl tertiary butyl ether(ETBE) and tertiary amyl methyl ether(TAME)in accordance with ' EPA Method 8260 Modified ' 3.0 FINDINGS ' Analytical data from water analysis are presented below and in Tables 2 through 3 Copies of the field measurements and laboratory reports are included in Appendices A and B t ' 3 1 GROUND WATER ELEVATION ' The ground,water elevations were calculated by subtracting the depths to ground water from the surveyed well casing elevations (Table 1) Ground water elevation decreased approximately 0 38 feet between September and December 1999 1 The upper surface of the saturated zone on the site appears to be toward the north west (well MW-3 and MW-6) There is an apparent ground water ridge on the northern portion of the property near , well MW-1 Due to this ridge of ground water surface, the upper ground water south of well MW-1 appears to be directed toward the south Figure 3 depicts the ground water elevation contours at the site Advanced CeoEnvironmental,Inc 1