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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-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 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 /> 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 April 25, 2001 Installation of a new air sparging well (SP-A) was <br /> performed on March 14, 2002 The remediation system was disengaged in <br /> December 2002 to evaluate whether petroleum concentrations in groundwater <br /> samples would remain stable Groundwater samples collected in February <br /> 2003 (discussed in Section 2 3 1 and 2 3 2) were the first obtained since the <br /> remediation system was disengaged A more detailed description of the <br /> remediation system and its operation is contained in Section 3 of this RACR <br /> 1.3 Property Usage/Water Well Survey <br /> The Earthgrains facility is located in an immediate area that is primarily <br /> industrial/commercial and agricultural in nature The facility is neighbored to <br /> the north by industrial/commercial facilities and by agricultural fields to the <br /> west and south The facility is bounded to the cast by South Airport Way, <br /> which is located almost 500 feet away from the former leaking UST The <br /> ' closest private residences are situated further east of South Airport Way about <br /> 1,000 feet away from the former leaking UST In addition to Duck Creek, the <br /> only other potential surface water body in the area would be the Homestead <br /> Canal located about 4,000 feet west of the former leaking UST <br /> A survey of potential off-site water wells within a radius of 2,000 feet from <br /> the former Earthgrain's USTs was performed by researching California <br /> 6 <br /> Remedial Action Completion Report <br /> The Earthgrams Company Facility <br /> 2651 South Airporl Way <br /> Stockton California <br /> Prepared for T11F.EART11GRAINS COMPANY Prepared by Philip Seryices Corp <br /> H 5ENV162400Ii2kl21382£G4Stockton\SiocktonVRemedialComplenonReport doc April 14,2003 <br />