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'"001 Worl:plad for Limited Subsurface Investigation Moore Bulk Petroleum Plant,5=491 F Street,Banta,San Joaquin County,California Associates of Sacramento, California; and Aegis Environmental, Inc. (Aegis), of Roseville, California. Site details may be found in a Quarterly Groun&vater Monitoring Report, dated April 18, 1991, submitted to Moore Petroleum by Aegis. 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 configured such that soil vapors could be extracted from either vapor well VEW-1 and/or monitoring well MW-I. 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 consisted of a one horse power electric motor which powers a 10-cubic feet per minute (CFM) oil-less compressor. The compressor injected air through an air sparge point located midway between VEW-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. 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 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. Apex submitted a Over Excavation & Groun&vater Removal Workplan dated September 10, 1997, proposing over excavation, de-watering and sampling of the bulk loading rack and tank basins during the nine UST removals. Apex supervised the removal of two 350 gallon USTS, T-8 and T-9 (kerosene and cleaning solvent, respectively) on August 17, 1998 and September 8, 1998, respectively. Also, seven 10,000 gallon USTs were removed on September 8, 1998. Results of the UST removal were documented by Apex in the report titled Tank Closure Results and Recommendations Report dated December 23, 1998. Following the removal of T-9, soil was over excavated and an exploratory trench was dug. Apex collected two soil samples and one groundwater sample from the over excavation and exploratory trench. One soil sample was collected from beneath T-8. After the removal of the seven 10,000 gallon USTs, Apex collected four soil samples and one groundwater sample. Apex then collected six additional soil samples and two additional water samples from beneath the tank basin. Nine 114.1 soil samples were submitted for analysis from the area beneath the former bulk loading rack. The 2