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' 21 December 2002 <br /> AGE-NC Project No 99-0559 <br />' Page 3 of 8 <br />' of 80 percent recharge prior to sample collection Following measurement, ground water samples <br /> were collected from purged wells MW-1, MW-3 and MW-4 utilizing disposable polyethylene <br /> bailers, and from wells MW-5A through MW-8E utilizing 3/8-inch diameter polyethylene tubing <br />' The ground water samples were transferred into three 40-m1 EPA-approved VOA vials containing <br /> 0 5 ml 18% hydrochloric acid as a sample preservative, care was taken to ensure that visible air <br /> bubbles were not present In the vials after filling and capping Ground water sample containers were <br />' properly labeled, placed in a chilled container and transported under chain-of-custody protocol to <br /> CalTech Environmental Laboratories(CTEL),a California Department of Health Services-certified <br /> laboratory, for analysis The ground water samples were analyzed for the following <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, <br />' Benzene, toluene, ethylbenzene and xylene (BTEX) and the fuel additives tertiary butanol <br /> (TBA), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether <br /> (TAME), methyl tertiary- butyl ether(MTBE), methanol, ethanol, ethyl-dibromlde (EDB) <br />' and 1,2-dichloroethane (1,2-DCA) In accordance with EPA Method 8260B <br /> 23 FREE PRODUCT REMOVAL <br />' Dunng the quarter, free-product was recovered in well MW-2 using a passive skimmer deployed in <br /> the well After removal, the water and free product were stored on-site in 55-gallon DOT H-17 <br /> storage drums The removal was performed in a accordance with California Underground Storage <br />' Tank Regulations, Article 5, Section 2655 <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected <br />' during September 2002, the contaminant impact to ground water was quantified by laboratory <br /> analysis of the ground water samples <br /> 1 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' The elevation of ground water in each monitoring well was calculated by subtracting the depth to <br /> ground water from the surveyed casing elevation, current and historical ground water elevation <br />' results are provided in Table 1 Each ground water elevation is grouped according to the HU or HUs <br /> that the well samples,on the assumption that the elevation will reflect hydrostatic conditions within <br /> the sampled HUs <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />