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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 Earthgrain'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 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 The remediation system was disengaged in December 2002 to evaluate whether petroleum concentrations in groundwater samples would remain stable Groundwater samples collected in February 2003 (discussed in Section 2 3 1 and 2 3 2) were the first obtained since the remediation system was disengaged A more detailed description of the remediation system and its operation is contained in Section 3 of this RACR 1.3 Property Usage/Water Well Survey The Earthgrains facility is located in an immediate area that is primarily industrial/commercial and agricultural in nature The facility is neighbored to the north by industrial/commercial facilities and by agricultural fields to the west and south The facility is bounded to the cast by South Airport Way, which is located almost 500 feet away from the former leaking UST The ' closest private residences are situated further east of South Airport Way about 1,000 feet away from the former leaking UST In addition to Duck Creek, the only other potential surface water body in the area would be the Homestead Canal located about 4,000 feet west of the former leaking UST A survey of potential off-site water wells within a radius of 2,000 feet from the former Earthgrain's USTs was performed by researching California 6 Remedial Action Completion Report The Earthgrams Company Facility 2651 South Airporl Way Stockton California Prepared for T11F.EART11GRAINS COMPANY Prepared by Philip Seryices Corp H 5ENV162400Ii2kl21382£G4Stockton\SiocktonVRemedialComplenonReport doc April 14,2003