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.y Closure Monitoring Report
<br /> Moore Petroleum,Inc, 14800 West Frontage Road,Manteca,California
<br /> Page 2
<br /> May 9, 1995 by Emcon Prior to Emcon, work conducted at the site included subsurface
<br /> investigations and groundwater monitoring by Delta Environmental Consultants, Inc , of Rancho
<br /> Cordova, Nations Groundwater Associates of Sacramento, and Aegis Environmental, Inc
<br /> (Aegis), of Roseville, Cahforrua Site details may be found in a "Quarterly Groundwater
<br /> Monitoring Report," dated April 14, 1995, submitted to Moore Petroleum by Emcon
<br /> In early 1995, Emcon installed a soil vapor extraction system consisting of a Remediation Service,
<br /> Int'1 (RSI) Spray Aeration Vapor Extraction (S A V E ) system at the subject site The vapor
<br /> extraction system was installed per San Joaquin Valley Urufied Air Pollution Control District
<br /> permit conditions The vapor extraction system consisted of an internal combustion engine with
<br /> catalytic converters mounted on the exhaust pipe To date, the vapor extraction system has
<br /> extracted approximately 2,390 lbs of TPH, as gasoline, and 7 8 lbs of benzene
<br /> On January 23, 1995, Emcon started a groundwater treatment system at the subject site The
<br /> groundwater treatment system was pneumatically operated via compressed air supplied from the
<br /> RSI unit and extracted groundwater from monitoring wells MW-1, MW-2, MW-3 and MW-4
<br /> Once the groundwater arrived in the remediation compound via V diameter PVC piping, it was
<br /> filtered through two in-line particulate filters and then through two in-line, 400 lb carbon vessels
<br /> Upon discharging from the carbon vessels, it was re-injected through two re-injection wells, RW-1
<br /> and RW-2, located to the west of the remediation compound (Figure 2) To date, the water
<br /> treatment system has extracted 1 8 pounds (lbs ) of TPH, as gasoline, and 0 37 lbs of benzene
<br /> On November 27, 1996, Moore Petroleum received a letter from SJCEHD giving their approval to
<br /> shut down the groundwater treatment system and the vapor extraction system due to low system
<br /> influent concentrations
<br /> Since March, 1996, Apex has conducted quarterly groundwater monitoring at the site
<br /> On August 29, 1997, Apex conducted a confirmation soil boring at the site Moore Petroleum
<br /> abandoned the on-site domestic well and replaced it with a deeper-screened domestic well DM-1
<br /> (Figure 2) On October 13, 1997, Apex sampled the newly installed DM-1 at the site The results
<br /> of this work was documented by Apex in"Results of Confirmation Soil Boring, Domestic Well
<br /> Sampling and Closure Request," dated October 27, 1997
<br /> GROUNDWATER MONITORING
<br /> Groundwater Levels
<br /> On November 21, 1997, Apex personnel collected groundwater level measurements from
<br /> monitoring wells MWA through MW-8 (Figure 2) Monitoring well MW-9 was not located by
<br /> our field personnel All groundwater elevations were measured to the nearest 0 01 feet referenced
<br /> to the surveyed top-of-casing elevations and conducted according to the Apex Standard
<br /> 7Y D 1_PROJECTIE'SI'ERA02 009-Moore Petroleum,MantecalQMR11971QMR1197 doe
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