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Third Quarter 2003 Groundwater Monitoring/Remediation Status Report
<br /> Moore Petroleum Bulk Plant,5491 FStreet,Banta,California '
<br /> Page 2 !k
<br /> Valley Uni1`aed 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,
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<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 /> (cfm} oil-less compressor. The compressor injected air through an air sparge point located ,
<br /> midway between VEW-nand 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.S1 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 dxtracted a total of 1,730 pounds of total petroleum hydrocarbons;as
<br /> t gasoline (TPHg), and 19.9 pounds of benzene.
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<br /> Apex submitted the report titled, Over Excavation & Groundwater Removal Workplan, dated .1
<br /> September 10, 1997;propos>ng over excavation, de-watering and sampling of the bulk loading
<br /> rack and tank basins-duriig 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 /> 3 , 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. Onel soil sample was
<br /> f' collected from beneath T18. 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 farmer bulk 1'oading 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 /> i, 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.
<br /> Apex submitted a workplan titled, Workplan for Limited Subsurfdce investigation, dated August '
<br /> b, 1999, proposing the installation of four additional groundwater monitoring wells (MW-4A, '.
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