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Second Quarter 2003 Groundwater Monitoring/Remediation Status Report x
<br /> Moore Petroleum Bulk Plant,5491 F Street,Banta,California
<br /> Page 2 t
<br /> Valley Unified Air Pollution Control District,(SJVUAPCD)permit conditions. The SVE system
<br /> consisted of an internal combustion engine with.catalytic converters mounted on the exhaust.
<br /> The system-was configured such that soil vapors could be extracted from either vapor well VEW-
<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 /> 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 /> (cfin) 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 /> a- gasoline (TPHg), and 19.9 pounds of benzene:
<br /> Apex submitted the report titled,Over Excavation & Groundwater Removal Workplan, dated
<br /> I
<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
<br /> UST).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.
<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, I
<br /> Results Report for Subsurface Investigation and Second Quarter 1999 Groundwater Monitoring,
<br /> r dated June 1, 1999.
<br /> Apex submitted a workplan titled, Workplan for Limited Subsurface Investigation, dated August
<br /> 6, 1999, proposing the installation of four additional groundwater monitoring wells•(MW-4A,
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