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Third Quarter 1996 Groundwater Monitoring&Remediation Status Report Moore Petroleum, 14800 W Frontage Rd,Manteca,CA November 1, 1996 Page 2 GROUNDWATER MONITORING Groundwater Levels On August 27, 1996, Apex personnel collected groundwater-level measurements from monitoring wells MW-1 through MW-9 (Figure 2) All groundwater elevations were measured to the nearest 0 01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex Standard Operating Procedures (SOP)included as Appendix A Groundwater level measurements collected since April 1992 are summarized in Table 1 Figure 3 is a potentiometrnc surface map of the shallow water-bearing zone on August 27, 1996 Groundwater Sampling and Analysis On August 27, 1996, Apex personnel collected groundwater samples from monitoring wells MW- 1 through MW-9 The station's domestic well (DM-1)was unaccessible at this tune and was sampled on September 10, 1996 All 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 Appendix A The groundwater samples from the nine monitoring wells and the domestic well were analyzed for total petroleum hydrocarbons (TPH), as gasoline,benzene, toluene, ethylbenzene and total xylenes(BTEX) by EPA Method 8020/8015 and for 1,2 Dichloroethane(EDC)by EPA Method 601 Groundwater samples collected from monitoring wells MW-1 through MW-4 and DM-1 were analyzed for TPH, as diesel, by EPA Method 8015 Modified The groundwater samples collected from MW-1 and MW-5 through MW-9 were analyzed for methyl-tert-butyl-ether(MTBE)by EPA Method 8020 Analyses were chosen as per San Joaquin County Environmental Health Division direction Groundwater samples collected from monitoring well MW-3 had detectable concentrations of TPH, as diesel, and groundwater samples collected from monitoring wells MW-7 and MW-9 had detectable concentrations of MTBE On September 18, 1996, monitoring well MW-3 was resampled and reanalyzed for TPH, as diesel, by EPA Method 8015 Modified Monitoring wells MW-7 and MW-9 were resampled and reanalyzed for MTBE by EPA Method 8260 The results of these sampling events are summarized in Table 2 The most recent laboratory analytical reports and chain-of-custody forms are included in Appendix B Vapor Extraction Remediation System Status In early 1995, Emcon installed a soil vapor extraction system consisting of a Remediation Service, Int'l Spray Aeration Vapor Extraction (S A V E ) system at the subject site The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) • permit conditions The vapor extraction system consists of an internal combustion engine with