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Fourth Quarter 1996 Groundwater Monitoring&Remediation Status Report 0 Moore Petroleum, 14800 W Frontage Rd,Manteca,CA January 23, 1997 Page 3 To date,the vapor extraction system has extracted approximately 2,390 lbs of TPH, as gasoline, and 7 8 lbs of benzene System operating data are contained in Table 3 Mass extraction rates to date,based on laboratory analytical results, are contained in Table 4 Grou dwater Remediation System On,January 23, 1995, Emcon started a groundwater treatment system at the subject site The groundwater treatment system is pneumatically operated via compressed air supplied from the - R_S I unit and extracts groundwater from monitoring wells MW-1, MW-2, MW-3 and MW-4 ' Once the groundwater arrives in the remediation compound via 1" diameter PVC piping, it is filtered through two in-line particulate filters and then through two in-line, 400 lb carbon vessels 'Upon discharging from the carbon vessels, it is remjected through two reinjection wells, RW-1 and RW-2, located to the west of the remediation compound (Figure 2) On November 27, 1996, Moore Petroleum received a letter from San Joaquin County Envuonmental Health Division giving their approval to shut down the groundwater treatment system due to system influent concentrations being below laboratory detection limits This letter is mcluded at Appendix B To date, the water treatment system has extracted 18 pounds(lbs ) of 3PH, as gasoline, and 0 37 lbs of benzene 'RECOMMENDATIONS Apex recommends continued groundwater monitoring at the subject site until a trend m post- remechation groundwater concentrations is recognized If groundwater contamination is still present after post remedial monitoring, Apex proposes performing a Risk Based Corrective Action (RBCA) assessment to determine whether or not emstmg groundwater contamination at the subject site is a risk to human health r r�