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a. f ' Second Quarter 2004 Groundwater Monitoring/Remediation Status Report `f Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 2 On May 5, 1995, a soil vapor extraction (SVE) system consisting of an R.S.I. 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, I995, at which time it was temporarily removed from the 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 SVE system. The air sparge system consisted of a one horsepower electric motor which powers a 10-cubic feet per minute Wrn) oil-less compressor.. The compressor injected air through an air sparge point Iocated midway between VEW-1 nd 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 had extracted a total of 1,730 pounds of total petroleum hydrocarbons, as gasoline (TPHg), and 19.9 pounds of benzene. Apex submitted the report titled, Over Excavation & Groundwater Removal Workplan, dated September 10, 1997, proposing over excavation, de-watering and sampling of the bulk loading rack and tank basins during the removal of nine underground storage tanks (UST). ` 1 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. Following the removal of T-9, soil was over excavated and an exploratory trench was dug. Apex collected two soil samples and one 1 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 the area beneath the former bulk loading rack were submitted for analysis. The results of all soil and water sampling were documented in the report titled, Tank Closure Results and 1 Recommendations Report, dated December 23, 1998. On April 8 and 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. 1