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26 February 2003 <br /> AGE-NC Project No. 96-0254 <br /> Page 2 of 4 <br />' 2.2. COLLECTION AND ANALYSTS OF GROUND WATER SAMPLES <br /> The depth to ground water was re-measured in each well following evacuation to assure a minimum <br /> Iof 80%recharge prior to sampling.Water samples were subsequently collected using new disposable <br /> plastic bailers from wells MW-1 through MW-6; MW-7 was bailed dry and did not recharge <br /> sufficiently to be sampled after a 2 hour wait. The water sample from each well was transferred into <br /> three chilled 40-m1 volatile organic analysis (VOA) vials containing 0.5 ml 18%hydrochloric acid <br /> (HCl) as a sample preservative and into one 1-liter amber bottle without a sample preservative. <br /> After collection, the samples were labeled and placed in a chilled container for transportation under <br /> chain-of-custodyto McCampbell Analytical,Inc.(MAI),a California Department ofHealth Services <br /> (DHS)-certified analytical laboratory. The ground water samples were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPII-d) in <br /> accordance with EPA Method 8015 Modified. <br />' Benzene, toluene, ethylbenzene and total xylenes (BTEX) in accordance with EPA Method <br /> 8021B. <br /> • • Fuel additives, including, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether (TAME) and tertiary-butyl <br /> alcohol (TBA) in accordance with EPA Method 8260B. <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 31 October 2002, the contaminant impact to ground water was assessed from the laboratory <br /> analytical data obtained from the sampling event. <br /> 3.1. GROUND WATER ELEVATION AND GRADIENT <br /> rThe elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1). <br /> The depths to ground water in wells MW-1 through MW-7 were measured between 7.05 feet and <br /> 8.12 feet below the tops of the well casings. Ground water elevations at the site ranged between <br /> 28.75 feet above mean sea level (MSL) in well MW-2B and 30.20 feet above MSL in well MW-6. <br /> Ground water elevations in wells MW-1 through MW-6 decreased an average 0.13 feet between the <br /> Advanced CcoEnvironmental Inc. <br />