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Operation of a frill scale air sparging and soil venting remediation system was <br /> initiated on April 25, 2001 Installation of a new air spargmg well (SP-A) was <br /> performed on March 14, 2002 when it was indicated that air infection at SP-1 <br /> was not resulting in an adequate decrease of petroleum impact in groundwater <br /> The remediation system was disengaged in December 2002 when it had <br /> reached a point where its effectiveness in removing contaminants became <br /> limited and to evaluate whether petroleum concentrations in groundwater <br /> samples would remain stable An increase in petroleum concentrations were <br /> noted in the MW-1 groundwater sample collected in February 2003, however, <br /> concentrations remained relatively stable in samples collected from other <br /> wells in the area of impact <br /> PSC submitted the April 14, 2003 Remedial Action Completion Report to <br /> EHD that presented a Site Conceptual Model for this facility, which is a <br /> characterization of the release, subsurface conditions and associated risks to <br /> potential receptors PSC found that potential routes of exposure were <br /> Iimprobable or incomplete and requested that EHD consider granting closure <br /> for this UST site EHD responded in their January 9, 2004 letter that directed <br /> additional site investigation be performed The February 20, 2004 Subsurface <br /> Investigation Work Plan, which proposed details of site work, was submitted <br /> to and approved by EHD <br /> 1 <br /> i <br /> I <br /> 6 <br /> i June 2004 Site Investigation Report <br /> The Earthgratns Company Facility <br /> 2651 South Airport Way-Stockton,California <br /> Prepared for SARA LEF BAKING Gaovr Prepared by Philip Services Corp <br /> H V-W624001321121382EG15rocktanUum 2004Invesugation Report doe August 9,2004 <br />