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I <br /> I <br /> 23 May 1996 <br /> I AGE-NC Project No 95-0132 <br /> Page 3 of 5 <br /> with the PHS-EHD, only wells MW-1 and MW-3 were sampled during the April 1996 monitoring <br /> event <br /> Temperature, pH and conductivity were measured from MW-I and MW-3 at 2 5 gallon intervals <br /> using an ICM Model 52200 water analyzer Stab imition data and field logs are included in Appendix <br /> A Purged ground water was placed in 55-gallon drums and stored on-site in an area inaccessible to <br /> the general public pending analytical results <br /> 3 2 GROUND WATER SAMPLING <br /> After purging, wells MW-I and MW-3 were allowed to recover for a minimum of one hour prior to <br /> sample collection Ground water samples were collected utilizing a dedicated, disposable polyethylene <br /> bailer and new nylon rope Sufficient sample was collected from each well to fill three 40-m1 EPA <br /> vials containing hydrochloric acid as a preservative, and one 1-liter amber bottle Care was taken to <br /> ensure that no air bubbles were present in the VOAs after filling and capping Ground-eater sample <br /> containers were labeled with the well designation, date, time, and the sampler's initials <br /> 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Following collection, each ground water sample was immediately Placed in a chilled container Each <br /> sample was logged on a chain-of-custody form and transported to Castle Analytical Laboratories, Inc <br /> (CAL) in Atwater, California, CAL is a California DTSC-certified laboratory <br />' Each sample was submitted for analysis of TPH-g, TPH-d, BTE&X and methyl-tertiary butyl ether <br /> (MTBE) in accordance with EPA Methods 5030/8015m and 8020 <br /> 4 0. FINDINGS <br />' 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The relative elevation of ground water in each well was calculated by subtracting the ground water <br />' depth from the surveyed relative casing elevation (Table 1) The ground water elevation rose <br /> approximately 4 26 feet in MW-1, 4 21 feet in MW-2, and 4 28 feet in MW-3 between November <br /> 1995 and April 1996 <br />' In November 1995, gr ound water gradient at the site was calculated to be approximately 0 0020 ft/ft <br /> (10 56 feet per mile) directed north 20° west In April 1996, the gradient was calculated to be <br /> approximately 0 0014 ft/ft (7 5 feet per mile) directed north 40° west Between November 1995 and <br />