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Workplan for Ozone Sparging
<br /> Moore Petroleum Bulk Plant,5491 F Street,Banta,California
<br /> Page 2
<br /> Environmental Consultants, Inc., of Rancho Cordova, California; Nations Groundwater
<br /> Associates of Sacramento, California; and Aegis Environmental, Inc. (Aegis), of Roseville,
<br /> California. Site details may be found in the report titled, Quarterly Groundwater Monitoring
<br /> Report, dated April 18, 1991, submitted to Moore by Aegis.
<br /> On May 5, 1995, an SVE system consisting of an R.S.I. SAVETM system was installed at the
<br /> subject site. The vapor extraction system was installed per San Joaquin Valley Unified Air
<br /> Pollution Control District (SJVUAPCD) permit conditions. The SVE system consisted of an
<br /> internal combustion engine with catalytic converters mounted on the exhaust. The system was
<br /> configured such that soil vapors could be extracted from either vapor well VEW-1 and/or
<br /> monitoring well MW-1. The system was started on May 5, 1995, and operated through October
<br /> 4, 1995, at which time it was temporarily removed from the site. On November 27, 1995, the
<br /> system was returned to the subject site and restarted.
<br /> An air sparge system was installed for use in conjunction with the SVE system. The air sparge
<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.
<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 had extracted a total of 1,730 pounds of total petroleum hydrocarbons, as
<br /> gasoline (TPHg), 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. Following the removal of T-9, soil
<br /> was over excavated and an exploratory trench was dug. Apex collected two soil samples and one
<br /> groundwater sample from the over-excavation and exploratory trench. One soil sample was
<br /> collected from beneath T-8. After the removal of the seven 10,000-gallon USTs, Apex collected
<br /> four soil samples and one groundwater sample from the tank pit. Apex then collected six soil
<br /> samples and two water samples from beneath the tank basin. Nine soil samples from the area
<br /> beneath the former bulk loading rack were submitted for analysis. The results of all soil and
<br /> water sampling were documented in the report titled, Tank Closure Results and
<br /> Recommendations Report, dated December 23, 1998.
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