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Geological Technics lhco <br /> 1101 7"Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax#522-4227 <br /> September 18, 2007 <br /> Project No.: 425.2 <br /> Project Name: George's Station <br /> George and Mei Teranishi <br /> 1600 Durham Ferry Road <br /> Tracy, CA 95304-8799 <br /> Re: Work Plan—Geoprobe Site Investigation <br /> George's Station, 1600 Durham Ferry Road,Tracy, CA <br /> Dear Mr. &Mrs. Teranishi: <br /> Geological Technics Inc. is pleased to submit the following Work Plan for further site <br /> investigation. <br /> GTI submitted a remedial action plan on November 29, 2007 followed by 3 addenda dated <br /> February 5, 25 and March 19, 2008 to mitigate the residual groundwater contamination using <br /> air sparging, vapor extraction and Oxygen Releasing Compound(ORC)technology in situ (in <br /> place). San Joaquin County Environmental Health Department (SJCEHD) approved the air <br /> sparging and vapor extraction portion of the remedial action plan subject to positive results <br /> from a limited 2-week pilot test in their correspondence dated April 30, 2008. However, the <br /> ORC injection design and application at the site per SJCEHD directive requires further site <br /> investigation to clarify the horizontal and vertical extent of the plume toward northern <br /> portion of the site (under Durham Ferry Road). The results obtained from the investigation <br /> presented as a result of this proposed geo-probe work will be used in ORC injection design <br /> and application on the north side of the site. <br /> The following work plan details our approach to further investigate the site. If you have any <br /> questions or need additional information,please contact me. <br /> Res " lly s it <br /> Raynold 1. Kablanow 11, Ph.D. <br /> Vice President <br /> cc: Nuel Henderson—EHD-SJC <br /> Jim Barton -CRWQCB-CVR <br /> USTCFP <br />