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22 February 2000 <br /> AGE-NC Project No 95-0128 <br />' Page 2 of 5 <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-m1 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 /> (TPH-g), <br />' 0 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 detennnned by subtracting the measured depths-to-water from the <br /> surveyed casing elevations Ground water flow directions were determined by contouring the water <br /> elevations on a scaled site plan (Figure 2) 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 10 February 2000 The laboratory reports are <br />' included in Appendix B <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The average ground water elevation on 31 January 2000 was approximately 0 01 feet higher than the <br /> average ground water elevation on 27 October 1999 The ground water in monitoring wells MW1, <br /> MW2 and MW3 was approximately 28 feet, 21 feet and 20 6 feet over the tops of the wells' screened <br /> intervals, respectively The ground water table occurred within the screened intervals of the other <br /> wells monitored Ground water was inferred to be flowing approximately N 38°E in both the <br /> properly screened wells and the deeply screened wells (Figure 2) The gradient determined for the <br /> Advanced GeoEnvi ron mental Inc <br />