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R Second Quarter 1997 Groundwater Monitoring&Remediation Status Report Moore Petroleum,Inc.,5491 "F"Street,Banta,CA June 2. 1997 Page 3 monitoring wells MW-1 and MW-4 in accordance to the Apex SOP included as Appendix A. The samples were submitted, under chain-of-custody documentation, to Sparger Technology of Sacramento, California, a state-certified analytical laboratory. The wells were sampled for TPH_ as gasoline and diesel, by Modified EPA Method 8015 and for benzene, toluene, ethylbenzene and total xylenes by EPA Method 8020. Analytical results are summarized in Table 2. On February 2, 1996, groundwater monitoring well MW-1 was sampled for methyl-tert-butyl-ether (MTBE)_ The results from this analysis were less than 30 micro-grams per liter and therefore, MTBE was no longer included in the analyses. The laboratory analytical reports and chain-of-custody form are included in Appendix B. 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 Second Quarter 1997 included the months of March and April. 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, February 25 through April 29, 1997, the vapor extraction system has averaged a flow rate of 20 CFM. During this reporting period, vapor samples were collected for laboratory analysis on March 13 and April 17, 1997. Based on the vapor sample analytical results for March 13, 1997, the system extraction rate was 0.78 pounds per day (lb./day) as TPH, as gasoline, and 0.00094 lb./day of benzene. Based on the vapor sample analytical results for April 17, 1997, the system extraction rate was 0.59 pounds per day (lb./day) as TPH, as gasoline, and 0.0034 lb./day of benzene. As of April 17, 1997, the vapor extraction system has extracted 1,730 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. A letter was received from SJCEHD (Appendix C) regarding the hour meter increase on Table 3 on December 17, 1996. The reason for this increase was that the vapor extraction portion of the remediation system had an equipment failure on September 19, 1996 and was replaced '.N ith another similar system on December 17, 1996. This is the explanation for the hour meter reading increase in Table 3 on December 17, 1996 and for the zero hours of operation on this same date in Table 4. 3 The letter from SJCEHD concurred with Apex's recommendation to shut down the remediation system due to low influent vapor concentrations being extracted from subsurface soils at the subject site. On April 29, 1997 the vapor extraction and air sparge system was shut down.