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December 1986, which initiated the permanent removal of both USTs The two diesel-fuel USTs were removed in September 1989 In July and September 1987, Environmental Science & Engineering (ESE) installed three groundwater monitoring wells (MW-I through MW-3) In January 1988, Anderson Consulting Group (ACG) installed wells MW-4 and MW-5 ACG subsequently drilled soil borings 90-1 and 90-2 and installed wells MW-6 and MW-7 in February 1990 and MW-8 in September 1990 PSC (formerly Burlington Environmental) installed wells MW-9 through MW-13 in March 1994 and piezometers PZ-1 and PZ-2 and air sparging well SP-1 in September 1994 PSC performed a soil venting and air sparging pilot test in October and November of 1994 to evaluate the effectiveness of this remediation ' technology Soil venting tests were performed using well MW-i, and air sparging tests were performed using well SP-I Results of the tests, contained in PSC's February 1, 1995 Final Remediation Plan, indicated that soil venting and air sparging would be effective in remediating hydrocarbon impact In June 1995, PSC proceeded with the installation of air sparging wells SP-2 t through SP-6 However, implementation of the sparge and vent remediation was postponed due to petroleum hydrocarbon concentration reductions that were observed at the time to be naturally occurring at the site In May 1999, PSC performed a subsurface investigation using cone penetrometer (CPT) technology Three CPT borings (CPT-1 through CPT-3) were driven, and soil and groundwater samples were collected for analysis This CPT investigation indicated that the lateral extent of impacted groundwater is largely contained within the Earthgrains property boundaries Results from this investigation were reported in PSC's May 1999 Subsurface Investigation and Groundwater Monitoring Report An additional air sparging and soil venting pilot test was performed in June 2000 using the newly drilled VW-1 as the vent well This test was conducted in general accordance with procedures described in PSC's May 15, 2000 Pilot Testing Work Plan Once again, pilot test results indicated that this technology would be an effective method of treating petroleum hydrocarbon impact at the site Test results and designs for an air sparging and soil venting remediation system are contained in PSC's August 31, 2000 Remedial Action Work Plan Operation of a full scale air sparging and soil venting remediation system was ' initiated on April 25, 2001 Installation of a new air sparging well (SP-A) was performed on March 14, 2002 i 5 August 2002 Groundwater Monitoring And Remediation Status Report i rhe Farlhgrams Baking Company 2651 South Airport Way Stockton,California Prepared for THE LARTIfGRAINS BAkINC COMPANY Prepared by Philip Services Corp H SLNV1624001321121382CG\Stockton%StocktonNoso2mon doc September 2 2002