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1 <br /> 06 April 1998 <br /> AGE-NC Project No 96-0229 <br />' Page 2 of 5 <br />' 2 2 GROUND WATER SAMPLING <br /> The ground water levels in the monitoring wells were allowed to recover for a minimum of one hour <br />' prior to sample collection Ground water samples were collected utilizing disposable polyethylene <br /> bailers and new nylon rope Sufficient ground water sample was collected from each well to fill three <br /> 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a preservative for the <br /> samples Care was taken to ensure that visible air bubbles were not present in the VOA vials after <br /> filling and capping Ground water sample containers were labeled with the well designation, date, <br /> time, and sampler's initials <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> transported to a California state-certified laboratory for analysis in accordance with the following <br />' EPA method 8015M for total petroleum hydrocarbons quantified as gasoline (TPH- <br /> g) <br /> • EPA method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylene <br /> BTE&X) with methyl-tertiary butyl ether(MTBE) <br />' EPA method 8260 for volatile organics (including oxygenates) <br /> The laboratory report(Castle Analytical Laboratory Reference No 1465 and McCampbell Analytical <br />' Inc Lab I D 85964 to 85969) and chain-of-custody forms are presented in Appendix B <br />' 3 0. FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water in the monitoring wells were measured between 28 81 and 31 33 feet <br /> below the top of the well casings Between November 1997 and February 1998, ground water <br /> el%`vanon lncrcascu all average 4 VV lt:l at the SAe <br />' During the February 1998 ground water monitoring event, the gradient was calculated to be 0 006 <br /> ft/ft, or approximately 35 feet per mile (Figure 3) Ground water monitoring data collected in the area <br /> of the monitoring wells suggests that the ground water flow direction was generally toward the north <br /> The ground water elevation data for the: monitoring wells during the February 1998 ground water <br /> monitoring event Is depicted In Figure 3 MWA and MW-2 were not utilized in contouring ground <br /> water elevations in Figure 3 due to anomalous measurements <br /> .4dvapiced CeaEn�ironmeniai,Inc <br />