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Fourth Quarter 2004 Groundwater Monitoring Report Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 2 May 5, 1995 - A soil vapor extraction (SVE) system consisting of an R.S.T. SAVETM system was installed at the subject site. The vapor extraction system was installed per San Joaquin Valley Unified Air Pollution Control District permit conditions. The SVE system consisted of an internal combustion engine with catalytic converters mounted on the exhaust. The system was configured so soil vapors could be extracted from either vapor well VEW-1 and/or monitoring well MW-1. The system was started on May 5, 1995, and operated through October 4, 1995, at which time it was temporarily removed from the site. On November 27, 1995, the system was returned to the subject site and restarted. May 31, 1995 - An air sparge system was installed and started, this was used in conjunction with the SVE system. The air sparge system operated intermittently through August 30, 1995, at which time its operation began to coincide with the operation of the R.S.I. system. The air sparge system consisted of a one horsepower 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). 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 had extracted a total of 1,730 pounds of total petroleum hydrocarbons, as gasoline (TPHg), and 19.9 pounds of benzene. September 10, 1997 - Apex submitted the report titled, Over Excavation & Groundwater Removal Workplan, proposing over excavation, de-watering and sampling of the bulk loading rack and tank basins during the removal of nine underground storage tanks (UST). August 17, 1998 and September 8, 1998 - Apex supervised the removal of two 350 gallon USTs, T-8 and T-9 (kerosene and cleaning solvent, pectively). Als , seven oso 1 was ove r 04 xcavatedUSTs and an were removed on September 8, 1998. Following the removal of T S 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 from the tank pit. Apex then collected six soil samples and two water samples from beneath the tank basin. Nine soil samples from oil and water sampling former bulk loading rack were submitted for analysis. The re documented in the report titled, Tank Closure Results and Recommendations Report, dated December 23, 1998. April 8 - 9, 1999 - Apex personnel supervised the advancement of eight soil borings at the subject property. The results of all soil and water sampling were documented in the report titled, Results Report for Subsurface Investigation and Second Quarter 1999 Groundwater Monitoring, dated June 1, 1999.