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7... Fourth Quarter 1996 Groundwater Monitoring&Remediation Status Report Moore Petroleum,Inc.,5491"F"Street,Banta,CA November 13, 1996 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-1. 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.I. system. GROUNDWATER MONITORING Groundwater Levels On October 24, 1996, Apex personnel collected groundwater-level measurements from all six monitoring wells in accordance to the Apex Standard Operating Procedures(SOP)included in 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 October 24, 1996, is shown on Figure 3. Groundwater Sampling and Analysis On October 24, 1996, Apex personnel collected groundwater samples from all six monitoring wells in accordance to the Apex SOP included in 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 total petroleum hydrocarbons(TPIT), as gasoline and diesel by Modified EPA Method 8015 and for benzene, toluene, ethylbenzene and total xylenes(BTEX)by EPA Method 8020. Analytical results are summarized in Table 2. On February 2, 1996, groundwater monitoring well MW-1 was sampled for MTBE. The results from this analysis were less than 30 micro-grams per liter and therefore, MTBE will no longer be included as an analysis. The laboratory analytical reports and chain-of-custody form are included in Appendix B.