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results, contained as an appendix in Anderson Consulting Group's (ACG) December 19, 1991 Problem Assessment Report, indicated that petroleum 1 hydrocarbon impact in soil extended to a depth of at least 28 feet During the April 1987 UST removals, impacted soil was excavated to 28 feet, which included the area where ESE had placed their borings Approximately 450 cubic yards of soil, including some 120 cubic yards that was noted to be impacted with gasoline, was land-farmed with guidance from the San Joaquin Air Pollution Control District (SJAPCD) In July and September 1987, ESE installed three groundwater monitoring wells (MW-1 through MW-3) In January 1988, 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 then 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-1, and air sparging tests were performed using well SP-1 Results of the tests, contained in PSC's February 1, 1995 Final Remediation Plan, indicated that soil venting andairh f parging would b� e effective in remediating hydrocarbon impact In June 1995, PSC proceeded with the installation of air sparging wells SP-2 through SP-6 However, implementation of the sparge and vent remediation was postponed due to naturally occurring petroleum hydrocarbon concentration reductions that were observed at the time 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 Eartligrain's 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 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 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 s Quarterly Groundwater Monitoring Report October 2004 The Earthgrains Company Facility 2651 South Airport Way-Stockton,California Prepared for SARA LEE BAKERY GROUP Prepared by Philip Services Corp H TNV162400132%121382EG15tockton Airport WayUrivesttgauon and Quarterly keportslQuariedy Report 1020N doe December 09,2004