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First Quarter 1996 Groundwater Monitormg&Remediation Status Report ' Moore Petroleum, 14800 W Frontage Rd,Manteca,CA April 24, 1996 Page 2 ' Monitoring Report," dated April 14, 1995, submitted to Moore Petroleum by Emcon GROUNDWATER MONITORING Groundwater Levels On February 15 1996, Apex personnel ersonnel collected groundwater-level measurements from monitoring wells MW-1 through MW-9 (Figure 2) All groundwater elevations were measured to tthe nearest 0 01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex Standard Operating Procedures (SOP) included as Attachment 1 Liquid- level measurements collected since May 1995 are summarized in Table 1 Historical water levels ' are included in Attachment 2 Figure 3 is a potentiometric surface map of the shallow water- bearing zone on February 15, 1996 ' Groundwater Sampling and Analysis On February 15, 1996, Apex personnel collected groundwater samples from all nine morutoring wells (MW-1 through MW-9) The samples were submitted, under chain-of-custody, to Sparger Technology, Inc , of Sacramento, California, a state-certified analytical laboratory All samples ' were collected according to the Apex SOP included in Attachment 1 The groundwater samples collected on February 15, 1996 from the nine monitoring wells were analyzed for total petroleum hydrocarbons (TPH), as gasoline, benzene, toluene, ethylbenzene and total xylenes (BTEX) ' Groundwater samples collected from monitoring wells MW-i through MW-4 were analyzed for both TPH, as diesel, and 1,2 Dichloroethane (EDC) The groundwater sample collected from MW-5 was analyzed for EDC also Groundwater samples collected from monitoring wells MW-5 ' through MW-9 were analyzed for methyl-tert-butyl-ether (MTBE) by method 8020 and 8260 The results of this sampling event are summarized in Table 2 On March 19, 1996, Apex personnel collected groundwater samples from monitoring wells MW- 5 through MW 9 and the domestic well supplying the station(DM-1) as per San Joaquin County Environmental Health Division request The samples were submitted, under chain-of-custody, to Sparger Technology, Inc, of Sacramento, California, a state-certified analytical laboratory All samples were collected according to the Apex SOP included in Attachment 1 The groundwater samples collected on March 19, 1996 were analyzed for EDC The sample collected from DM-1 ' was additionally analyzed for TPH, as gasoline, TPH, as diesel, BTEX, and MTBE by 8020 and 8260 The results of this sampling event are included in Table 2 Historical analytical results are included in Attachment 2 The most recent laboratory analytical reports and chain-of-custody forms are included in Attachment 3