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i L..� First Quarter 1997 Groundwater Monitoring&Remediation Status Report Moore Petroleum,Inc.,5491 "F"Street,Banta,CA April 7, 1997 Page 3 REMEDIATION STATUS Influent and effluent vapor samples have been collected from the vapor extraction system on a monthly basis to demonstrate compliance with the SJVUAPCD Permit conditions. Quarterly results for the First Quarter 1997 included the months of November, December and January. Vapor samples were unable to be collected in October and November of 1996 due to system malfunction. The air samples were collected according to the Apex SOP included in Appendix A and submitted, under chain-of-custody documentation, to Sparger Technology, Inc. of Sacramento, California, a State-certified laboratory. The air samples were analyzed for concentrations of TPH, as gasoline, and BTEX. Analytical reports and chain-of-custody forms are included in Appendix B. During this reporting period, December 17, 1996 through February 13, 1997, the vapor extraction system has averaged a flow rate of 25 CFM. During this reporting period, vapor samples were collected for laboratory analysis on December 17, 1996, January 15, and February 13, 1997. Based on the vapor sample analytical results for December 17, 1996, the system extraction rate was 1.4 pounds per day (lb./day) as TPH, as gasoline, and 0.049 lb./day of benzene. Based on the �- vapor sample analytical results for January 15, 1997, the system extraction rate was 1.7 pounds per day (lb./day) as TPH, as gasoline, and 0.060 lb./day of benzene. Based on the vapor sample analytical results for February 13, 1997, the system extraction rate was below laboratory detection limits for TPH, as gasoline, and benzene. As of February 13, 1997, the vapor extraction system has extracted 1,720 pounds of TPH, as gasoline, and 19.9 pounds of benzene. System operating data is contained in Table 3. Extraction rates and analytical results to date are summarized in Table 4. RECOMMENDATIONS Monitoring well MW-1 is the only well at the subject site containing constituents of gasoline and diesel; all other wells have been below laboratory detection limits for constituents analyzed since February of 1996. These facts lead Apex to the recommendation that monitoring well MW-1 should be monitored on a quarterly basis and monitoring wells MW-2 through MW-6 should be monitored on an annual basis. Soil vapor concentrations being withdrawn from vapor extraction well VEW-1 and monitoring well MW-I have been steadily decreasing with time. Extraction rates of the remediation system in February of 1997 were below laboratory detection limits for concentrations of TPH, as gasoline, and benzene. Apex recommends turning the vapor extraction system and air sparge system off until the underground storage tanks are removed from the subject site in the summer or fall of 1997, at which time the subsurface conditions of the subject site will be characterized.