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1 <br /> Following the December 1986 tank integrity test failure, Environmental <br /> Science & Engineering (ESE) drilled five borings around the perimeter of the <br /> two adjacent gasoline USTs and collected soil samples for analysis ESE's <br /> results, contained as an appendix in Anderson Consulting Group's (ACG) <br /> December 19, 1991 Problem Assessment Report, indicated that petroleum <br /> hydrocarbon impact in soil extended to a depth of at least 28 feet <br /> During the April 1987 UST removals, impacted soil was overexcavated to 28 <br /> ifeet, which included the area where ESE had placed their borings <br /> Approximately 450 cubic yards of soil, including some 120 cubic yards that <br /> was noted to be impacted with gasoline, was land-farmed with guidance from <br /> the San Joaquin Air Pollution Control District (SJAPCD) <br /> In July and September 1987, ESE installed three groundwater monitoring <br /> wells (MW-1 through MW-3) In January 1988, ACG installed wells MW-4 <br /> and MW-5 ACG subsequently drilled soil borings 90-1 and 90-2 and installed <br /> wells MW-6 and MW-7 in February 1990 and then MW-8 in September 1990 <br /> PSC (formerly Burlington Environmental) installed wells MW-9 through <br /> MW-13 in March 1994, and piezometers PZ-1 and PZ-2 and air sparging well <br /> SP-I in September 1994 <br /> PSC performed a soil venting and air sparging pilot test in October and <br /> November of 1994 to evaluate the effectiveness of this remediation <br /> technology Soil venting tests were performed using well MW-1, and air <br /> sparging tests were performed using well SP-I Results of the tests, contained <br /> in PSC's February 1, 1995 Final Remediation Plan, indicated that soil venting <br /> and air sparging would be effective in remediating hydrocarbon impact <br /> In June 1995, PSC proceeded with the installation of air sparging wells SP-2 <br /> through SP-6 However, implementation of the sparge and vent remediation <br /> was postponed due to naturally occurring petroleum hydrocarbon <br /> concentration reductions that were observed at the time <br /> In May 1999, PSC performed a subsurface investigation using cone <br /> penetrometer (CPT)technology Three CPT borings (CPT-I through CPT-3) <br /> were driven, and soil and groundwater samples were collected for analysis <br /> This CPT investigation indicated that the lateral extent of impacted <br /> groundwater is largely contained within the Earthgrain's property boundaries <br /> Results from this investigation were reported in PSC's May 1999 Subsurface <br /> Investigation and Groundwater Monitoring Report <br /> An additional air sparging and soil venting pilot test was performed in June <br /> 2000 using VW-1 as the vent well This test was conducted in general <br /> accordance with procedures described in PSC's May 15, 2000 Pilot Testing <br /> Work Plan Once again, pilot test results indicated that this technology would <br /> be an effective method of treating petroleum hydrocarbon impact at the site <br /> 1 s <br /> June 2004 Site investigation Report <br /> The Eantigrams Company Facility <br /> 2651 South Airport Way-Stockton,California <br />' Prepared for SARA LEE BAKING GROUP Prepared by Philip Services Corp <br /> HwNV16240013211213g2SG%SrockmnVune 20G4 invotigawn Report doe August 9,2004 <br />