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17 November 1999 <br /> AGE-NC Project No 95-0128 <br />' Page 2 of 7 <br />' 2 2 GROUND WATER SAMPLE COLLECTION <br /> A water sample was collected from each well using a new, clean, disposable plastic bailer <br /> Immediately upon retrieval, samples were transferred into three 40-ml EPA-approved VOA vials <br /> containing 0 5 ml 18%hydrochloric acid as a sample preservative and into a one-liter amber bottle <br />' without the preservative The samples were logged on a chain-of-custody form, stored in a chilled <br /> container and transported under chain-of-custody to McCampbell Analytical Inc (MAI),a California <br /> Department of Health Services(DHS)-certified laboratory The ground water samples were analyzed <br /> in accordance with <br /> • EPA Method 8015M modified for total petroleum hydrocarbons quantified as gasoline <br /> I (TPH-g), <br /> • EPA Method 8015M for total petroleum hydrocarbons quantified as diesel (TPH-d), <br /> • EPA Method 8020 for volatile aromatics(benzene,toluene,ethylbenzene and xylene BTEX) <br /> with methyl-tertiary butyl ether(MTBE), and <br /> • EPA Method 8260M modified for oxygenated fuel additives di-isopropyl ether(DIPE), ethyl <br /> tertiary butyl ether (ETBE), MTBE, tertiary butyl alcohol (TBA) and tertiary amyl methyl <br /> ether (TAME) <br /> 3.0 FINDINGS <br /> Ground water elevations were determined by subtracting the measured depths-to-water from the <br /> I surveyed casing elevations Ground water flow directions were determined by contouring the water <br /> elevations on scaled site plans (Figures 3 through 6) The field data Is presented in Appendix A The <br /> concentrations of dissolved hydrocarbons and oxygenating compounds in the water samples were <br />' reported in the analytical reports issued by MAI, dated 20 July 1999 and 05 November 1999 The <br /> laboratory reports are included in Appendix B <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The average ground water elevation on 08 July 1999 was approximately 1 59 feet lower than the <br /> average ground water elevation on 22 March 1999 On 08 July 1999 ground water in monitoring <br /> wells MW 1, MW2 and MW3 was approximately 30 03 feet, 23 30 feet and 22 73 feet over the tops <br /> of the wells' screened intervals, respectively The ground water table occurred within the screened <br /> intervals of the other wells monitored Ground water was inferred to be flowing approximately N <br /> 15'E in the properly screened wells (Figure 3) and N 12'E in the deeply screened wells (Figure 4) <br /> Advanced Geo Environmental Inc <br />