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Third Quarter 1997 Groundwater Monitoring Report Moore Petroleum,Inc.,54917"F"Street,Banta,CA September 17, 1997 Page 2 On May 5, 1995, a soil vapor extraction system consisting of an R.S.I. SAVE system was installed 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 consists of an internal combustion engine with catalytic converters mounted on the exhaust. The system was set up such that soil vapors could be extracted from either vapor well VW-1 and/or monitoring well MW-l. The system was started on May 5, 1995, and has operated through October 4, 1995, at which time it was temporarily removed from site. On November 27, 1995, the system was returned to the subject site and restarted. An air sparge system was installed for use in conjunction with the vapor extraction system. The air sparge system consists of a one horse power electric motor which powers a 10-cubic feet per minute (CFM) oil-less compressor. The compressor injects air through an air sparge point located midway between VW-1 and MW-1 (Figure 2). The air sparge system was started on May 31, 1995 and operated intermittently through August 30, 1995, at which time its operation began to coincide with the operation of the R.S.1, system. On April 29, 1997, Apex received permission from the San Joaquin County Environmental Health Division (SJCEHD)to shut down the air sparge and vapor extraction system due to low influent sa.w, soil vapor concentrations to the vapor extraction system. As of April 29, 1997, the remediation system has extracted a total of 1,730 pounds of total petroleum hydrocarbons (TPH), as gasoline, and 19.9 pounds of benzene. GROUNDWATER MONJTORING Groundwater Levels On July 29, 1997, Apex personnel collected groundwater-level measurements from all six monitoring wells in accordance to the Apex Standard Operating Procedures (SOP) included as Appendix A. All groundwater elevations were measured to the nearest 0.01 foot, referenced to the surveyed top-of-casing elevations. Groundwater level measurements collected since January 1993 are summarized in Table 1, A potentiometric surface map of the shallow water-bearing zone on July 29, 1997, is shown on Figure 3. Groundwater Sampling and Analysis A letter dated April 29, 1997 from the SJCEHD, stated that they concurred with Apex's recommendations to reduce the sampling of the monitoring wells to annually, with the exception of wells MW-1 and MW-4, which will still be monitored on a quarterly basis. However, in a letter dated July 18, 1997 from the Central Valley Regional Water Control Board (RWQCB), included as Appendix C, the subject site has been required to analyze seven oxygenate compounds commonly used in California gasoline. As a result, on July 29, 1997 Apex personnel collected C:IKBPROJ--lTRA021ERA02.0041QMR 0897.WPD