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r <br /> r <br /> 26 November 1996 a R <br /> AGE-NC Project No 95-0120 <br /> ' Page 2 of 4 ' <br /> 2 2 GROUND WATER SAMPLING' <br /> S <br /> Monitoring wells MW-1 through MW-3 were allowed to recover for a minimum of one hour prior <br /> to sample `collection Ground water samples were collected utilizing_ dedicated,, disposable <br /> polyethylene bailer's and new nylon rope Sufficient sample was collected from each well to fill three <br /> 40-m1 EPA vials containing 0 5 ml of 18% hydrochloric acid as a preservative, and a one-liter amber <br /> I ' bottle Care was taken to ensure that no air bubbles were present in the VOAs after filling and <br /> capping Ground-water sample containers were labeled with the well designation, date, time, and <br /> samplers initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> After collection, each sample was lagged on a chain-of-custody form, placed in a chilled container <br /> and transported to a Alpha Analytical Laboratories (A.AL), a California state-certified laboratory for <br /> chemical analysis Each sample was analyzed for total petroleum hydrocarbons quantified as gasoline <br /> and diesel (TPH-g and TPH-d), and for volatile aromatics (benzene, toluene, ethyl6enzene and <br /> xylenes BTE&X), with methyl-tertiary butyl ether (MTBE) in accordance with EPA inethods 5030, <br /> 8015M, and 602,'respectively The laboratory report (AAL Laboratory Batch No 96-0613-010-01 <br /> through 03) and chains-of-custody are presented in Appendix B <br /> 3 0. FINDINGS : <br /> r <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative surfaceg round water elevation on 09 September 1996 is depicted in Figure 3 The depth <br /> , <br /> to ground water m wells MW-1 through 111W-3 ranged between 67 72 feet and 68 37 feet below site <br /> grade, and on the average declined approximately 1 16 feet at the site between June 1996 and <br /> September 1996 k <br /> In June 1996, the ground water gradient was calculated to be 0 0015 ft/ft ( approximately 8 feef per <br /> Imile), directed S 78°E In September 1996, the ground water gradient was calculated to be 0 0012 <br /> (approximately 6 feet per mile) directed S 67E(Figure 3 -SuiJace Ground Water Elevation Contour <br /> Map) Between June 1996 and September 1996, ground water flow direction beneath the site rotated <br /> approximately I V towards the south <br /> r i <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> In September 1996, TPH-g was detected in ground water samples collected from MW-3 at <br /> i I - <br />