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. Results of Confirmation Soil Boring,Domestic Well Sampling And Closure Request Moore Petroleum,Inc, 14800 West Frontage Road,Manteca, California Page 3 VB-4-25 were submitted under COC documentation to Sparger Sparger received these two soil samples and signed the COC Sparger informed Apex on October 16, 1997 that they never extracted and analyzed the two soil samples VB-4-15 and VB-4.25 Field screening of all soil samples for VB-4 were all "zero" on the photo-ionization meter, and no odors were noticeable DOMESTIC WELL WATER SAMPLING RESULTS On August 29, 1997, Apex personnel collected water samples from the station's domestic well (DM-1) and the domestic well of a trailer park located to the south of the subject site (DM-2) Prior sampling indicated the presence of 1,2-dichloroethane from both of the domestic wells Apex believes the former results from well DM-2 may have been another lab error The water samples were submitted, under chain-of-custody documentation to Sparger All samples were collected in accordance with the Apex SOP included in Appendix A The water samples were analyzed for TPH, as gasoline, TPH, as diesel, BTEX and MTBE by EPA Methods 8020 and 8015 The water samples were also analyzed for 1,2-dichloroethane by EPA Method 601 The analytical results of the domestic well samples indicate that all constituents were below standard lab detection limits The results of the water sampling are summarized in Table 2 The laboratory analytical reports and COC form are included in Appendix B Moore Petroleum abandoned the one on-site domestic well DM-1 and replaced this well with a deeper screened well (Figure 2) Apex collected a groundwater sample from this new domestic well on October 13, 1997 The groundwater sample from the new domestic well was submitted under COC to Sparger, for analyses of TPH, as gasoline, TPH, as diesel, BTEX, 1,2-dichloro- ethane and MTBE The results of the analyses were below laboratory detection limits for all constituents analyzed RECOMMENDATIONS Due to the historically non-detect or near-detection-limit petroleum hydrocarbon concentrations in groundwater monitoring wells at the subject site, non-detect hydrocarbons in confirmation soil boring samples collected on August 29, 1997, and non-detect hydrocarbons and Halogenated organics in both domestic wells on and off the site, Apex believe the subject site has achieved its subsurface cleanup goals Therefore, Apex recommends closure for the site In support of this closure request, Apex included an Appendix B of the Tri-Regional Recommendations Checklist in the Appendix C of this report JY D 1_PR0JECTIE'S1ERA02 0091Results09971Resu1tsReport doe