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I <br /> May 1, 2003 <br /> Page 2 <br />' GRASP WELL INSTALLATION <br /> IOn January 22 — 24, 2003, KHM supervised the drilling and installation of four <br /> groundwater monitoring wells (MW-1 through MW-4) Well locations are shown on <br /> Figure 2 KHM obtained a well permit from the San Joaquin County Environmental Health <br /> Department to install these wells (Appendix A) Well construction details are displayed in <br /> the boring logs presented in Appendix B Well development sheets are included in <br /> Appendix C Site survey data is included as Appendix D <br /> ANALYTICAL FINDINGS <br /> I Soil samples were taken during the drilling of site wells Soil samples with a <br /> photoionization detector (PID) reading greater than 10 parts per million were analyzed for <br /> the presence of petroleum hydrocarbons and fuel oxygenates No chemical impacts were <br /> detected at or above the method reporting limit (MRL) in soil samples submitted for lab <br /> analysis Soil analytical results are summarized in Table 1, and displayed within Figure 3 <br /> . Certified analytical results and chain-of-custody documentation for soil are presented as <br /> Appendix E <br /> After well development, on March 7, 2003 the monitoring wells were sampled and <br /> Ianalyzed for chemical impacts Total petroleum hydrocarbons as gasoline (TPH-g) were <br /> detected in groundwater samples collected from Wells MW-1 and MW-2 with <br /> concentrations of 2,900 micrograms per liter (µg/1) and 220 µg/l, respectively Methyl <br /> tert-butyl ether (MTBE) was detected in water samples collected from Wells MW-3 and <br /> MW-4 with concentrations of 2 9 pg/l and 9 S pg/l, respectively Benzene was detected <br /> I in water samples collected from Wells MW-1 and MW-3 with concentrations of 23 ug/1 <br /> and 0 59 pg/1, respectively Groundwater analytical data is summarized in Table 2 and <br /> presented in Figure 4 Certified analytical results and chain-of-custody documentation for <br /> groundwater are presented in Appendix F Well gauging data sheets are included in <br /> Appendix G A groundwater elevation contour map is presented as Figure 2 <br /> IUNAUTHORIZED RELEASE REPORT <br /> I The previously submitted Unauthorized Release Report dated March 25, 2003 is included <br /> as Appendix H for your reference <br /> I <br /> I <br />