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<br /> ` second Quarter 2002 Groundwater Monitoring Report
<br /> Moore Petroleum Bulk Plant,5491 F Street,Banta,California
<br /> Page 2
<br /> 1 and/or monitoring well MW-1. The system was started on May 5, 1995, and operated through
<br /> October 4, 1995, at which time it was temporarily removed from the site. On November 27,
<br /> 1995,the system was returned to the subject site and restarted.
<br /> e system was installed for use in conjunction with the SVE system. The air sparge
<br /> An air sparg y )
<br /> system consisted of a one horse power electric motor which powers a 10-cubic feet per minute
<br /> (CFM) oil-less compressor. The compressor injected air through an air sparge point located
<br /> midway between VEW-1 and MW-1 (Figure 2). The air sparge system was started on May 31,
<br /> 1995 and operated intermittently through August 30, 1995, at which time its operation began to
<br /> coincide with the operation of the R.S.I. system. F
<br /> On April 29, 1997, Apex received permission from the San Joaquin County Environmental
<br /> Health Division (SJCEHD) to shut down the air sparge and vapor extraction system due to low
<br /> influent soil vapor concentrations to the vapor extraction system. As of April 29, 1997, the
<br /> remediation system has extracted a total of 1,730 pounds of total petroleum hydrocarbons (TPH),
<br /> as gasoline, and 19.9 pounds of benzene.
<br /> Apex submitted the report titled, Over Excavation & Groundwater Removal Workplan, dated
<br /> September 10, 1997, proposing over excavation, de-watering and sampling of the bulk loading
<br /> rack and tank basins during the removal of nine underground storage tanks (UST).
<br /> Apex supervised the removal of two 350 gallon USTs, T-8 and T-9 (kerosene and cleaning
<br /> solvent, respectively) on August 17, 1998 and September 8, 1998, respectively. Also, seven
<br /> 10,000 gallon USTs were removed on September 8, 1998. Results of the UST removal were
<br /> documented by Apex in the report titled, Tank Closure Results and Recommendations Report,
<br /> dated December 23, 1998.
<br /> Following the removal of T-9, soil was over excavated and an exploratory trench was dug. Apex
<br /> collected two soil samples and one groundwater sample from the over-excavation and
<br /> exploratory trench. One soil sample was collected from beneath T-8. After the removal of the
<br /> seven 10,000 gallon USTs, Apex collected four soil samples and one groundwater sample from
<br /> the tank pit. Apex then collected six additional soil samples and two additional water samples
<br /> from beneath the tank basin. Nine soil samples from the area beneath the former bulk loading
<br /> rack were submitted for analysis. The results of all soil and water sampling were documented in s
<br /> the report titled, Tank Closure Results and Recommendations Report, dated December 23, 1998,
<br /> On April 8 and 9, 1999, Apex personnel supervised the advancement of eight soil borings at the
<br /> subject property. The results of all soil and water sampling were documented in the report titled, }
<br /> Results Report for Subsurface Investigation and Second Quarter 1999 Groundwater Monitoring,
<br /> dated June 1, 1999.
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