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28 May 1999 <br /> AGE-NC Project No 95-0128 <br /> Page 2 of 5 <br />' 22 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 />' 0 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(DIPS), ethyl <br /> tertiary butyl ether (ETBE), MTBE, tertiary butyl alcohol (TBA) and tertiary arnyl methyl <br /> ether (TAME) <br /> 3.0. FINDINGS <br /> In March 1999, an Independent civil engineering firm, Bombach& Piazza, Inc . surveyed the ground <br /> water monitoring well casing elevations relative to City of Stockton Bench Mark#15 The surveyed <br /> well elevations were utilized for calculation of ground water elevations The survey report is in <br /> Appendix A Ground water elevations were determined by subtracting the measured depths-to-water <br /> from the surveyed casing elevations Ground water flow direction was determined by contouring the <br /> water elevations on scaled site plans (Figures 3 and 4) The field data is presented in Appendix B <br /> The concentrations of dissolved hydrocarbons and oxygenating compounds in the water sample were <br /> reported in the analytical report issued by McCampbell Analytical, Inc , dated 30 March 1999 The <br /> laboratory report is included in Appendix C <br /> I3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The average ground water elevation on 22 March 1999 was approximately 3 38 feet higher than the <br /> average ground water elevation on 31 December 1998 Ground water in monitoring wells MW1, <br /> MW2 and MW3 was approximately 3165 feet, 24 98 feet and 24 32 feet over the tops of the wells' <br /> screened intervals, respectively The ground water table occurred within the screened intervals of the <br /> Adti,anced CeoEnvironmenlal Inc <br /> f <br />