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Second Quarter 1997 Groundwater Monitoring Report . Moore Petroleum, 14800 W Frontage Rd,Manteca,CA September 11, 1997 Page 2 In early 1995, Emcon installed a soil vapor extraction system consisting of a Remediation Service, Int0l Spray Aeration Vapor Extraction (S A V E) system at the subject site The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) permit conditions The vapor extraction system consisted of an internal combustion engine with catalytic converters mounted on the exhaust pipe To date, the vapor extraction system has extracted approximately 2,390 lbs of TPH, as gasoline, and 7 8 lbs of benzene On January 23, 1995, Emcon started a groundwater treatment system at the subject site The groundwater treatment system was pneumatically operated via compressed air supplied from the R S I unit and extracted groundwater from monitoring wells MW-1, MW-2,MW-3 and MW-4 Once the groundwater arrived in the remediation compound via 1" diameter PVC piping, it was filtered through two in-line particulate filters and then through two in-line, 400 lb carbon vessels Upon discharging from the carbon vessels, it was reinfected through two reinfection wells, RW-1 and RW-2, located to the west of the remediation compound (Figure 2) To date, the water treatment system has extracted 18 pounds (lbs) of TPH, as gasoline, and 0 37 lbs of benzene On November 27, 1996, Moore Petroleum received a letter from San Joaquin County Environmental • Health Division giving their approval to shut down the groundwater treatment system and the vapor extraction system due to low system influent concentrations GROUNDWATER MONITORING Groundwater Levels On May 29 and June 14, 1997, Apex personnel collected groundwater-level measurements from monitoring wells MW-1 through MW-9 (Figure 2) All groundwater elevations were measured to the nearest 0 01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex Standard Operating Procedures (SOP) included as Appendix A Groundwater level measurements collected since April 1992 are summarized in Table 1 Figure 3 is a potentiometnc surface map of the shallow water-bearing zone on May 29, 1997 A.1QMR0797 WPD