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Third Quarter 1996 Groundwater Monitoring&Remediation Status Report Moore Petroleum, 14800 W Frontage Rd,Manteca,CA November 1, 1996 Page 3 catalytic converters mounted on the exhaust pipe During this reporting period, soil vapor flow to the system has averaged 41 standard cubic feet per minute(SCFM) Vapor samples were collected from the system influent and effluent on August 16, September 10, and October 17, 1996 to demonstrate compliance with SJVUAPCD permit On August 16, 1996, the vapor extraction rate was 42 SCFM Based on the vapor sample analytical results for this date, the system extraction rate was 0 60 pounds per day(lb /day) of TPH, as gasoline, and benzene was below laboratory detection limits On September 10, 1996, the vapor extraction rate was 38 SCFM Based on the vapor sample analytical results for this date, the system extraction rate was 0 72 pounds per day(lb/day) of TPH, as gasoline, and benzene was below laboratory detection limits On October 17, 1996, the vapor extraction rate was 42 SCFM Based on the vapor sample analytical results for this date the system extraction rate was 0 60 lb/day ofTPH, as gasoline Benzene was not detected in the influent to the vapor extraction system on this date Air analytical results and cham-of-custody forms are contained in Appendix B As of October 17, 1996, 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 • On August 27, 1996, radius of mfluence measurements of the vapor extraction system were collected from all nine monitoring wells and the two remjection wells The measurements were taken by attaching a vacuum gauge to the PVC well casings and waiting approximately five minutes such that a vacuum equilibrium in the well casing could be attained Results of the radius of influence measurements are included in Table 5 Groundwater 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 V diameter PVC piping, it is filtered through two m-hne particulate filters and then through two in-line, 4001b carbon vessels Upon discharging from the carbon vessels, it is remjected through two remjection wells, RW-1 and RW-2, located to the west of the remediation compound (Figure 2) In August of 1996, the compressor which operates the water treatment system had a mayor mechanical failure Apex is currently reviewing the effectiveness of the water treatment system on the remediation of the groundwater at the subject site To date, the water treatment system has extracted 1 8 pounds (lbs ) of TPH, as gasoline, and 0 37 Mlbs of benzene System operating data is contained in Table 6 Mass extraction rates to date, based on laboratory analytical results, are contained in Table 7