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with sand The western-mast gasoline tank failed a tank Integrity test in <br /> December 1986, which Initiated the permanent removal of both USTs The <br /> 1 two diesel-fuel USTs were removed in September 1989 <br /> In July and September 1987, Environmental Science & Engineering (ESE) <br /> Installed three groundwater monitoring wells (MW-1 through MW-3) In <br /> January 1988, Anderson Consulting Group (ACG) Installed wells MW-4 and <br /> 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 MW-8 in September 1990 PSC <br /> (formerly Burlington Environmental) Installed wells MW-9 through MW-13 <br /> in March 1994 and piezometers PZ-1 and PZ-2 and air sparging well SP-1 In <br /> 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-1 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 petroleum hydrocarbon concentration reductions that <br /> were observed at the time to be naturally occurring at the site <br /> In May 1999, PSC performed a subsurface investigation using cone <br /> penetrometer (CPT) technology Three CPT borings (CPT-1 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 Earthgrains 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 /> 1 2000 using the newly drilled VW-I as the vent well This test was conducted <br /> in general accordance with procedures described In PSC's May 15, 2000 Pilot <br /> Testing Work Plan Once again, pilot test results indicated that thus technology <br /> I would be an effective method of treating petroleum hydrocarbon impact at the <br /> site Test results and designs for an air sparging and soil venting remediation <br /> system are contained in PSC's August 31, 2000 Remedial Action Work Plan <br />' Operation of a full scale air sparging and soil venting remediation system was <br /> Initiated on Apnl 25, 2001 <br /> 5 <br /> April 2002 <br /> Groundwater Monitoring And <br /> Air Sparging Well Installation Report <br /> The Earthgrains Baking Company <br /> 265I South Airport Way <br /> Stockton,California <br /> Prepared for THE EARTHGRAINs BAKING COMPANY Prepared by Philip Services Corp <br /> HlENV1624001321121382EG1Stockton\Sto kton10402mon dot May 21,2002 <br />