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i <br /> i <br /> C,eo10 icaI Technics Inc. <br /> 11017 Ih Street <br /> Modesto,Califomia 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> January 23, 2009 <br /> Project No.: 770.2 <br /> Project Name: Marci Property (Loomis Rd) <br /> Mrs. Margaret Marci <br /> g , <br /> 20 Mobile Lane <br /> Crescent City, CA 95531 <br /> RE: Revised Work Plan: Additional Dual Phase Extraction Pilot Test <br /> Former Marci's Diesel Service(Marci Property), 2969 Loomis Road, Stockton, CA <br /> f <br /> Dear Mrs. Marci: <br />{ Geological Technics Inc. has prepared the following Revised Pilot Test work plan in response to the <br /> San Joaquin County Environmental Health Department (SJCEHD) directive in their correspondence <br /> dated December 31, 2008. Geological Technics Inc. tested several methodologies including <br /> bioventing, biosparging, soil vapor extraction and dual phase extraction between November 26 and <br /> December 14, 2007 on-site to find the best methodology to address the residual diesel contamination <br /> at the 2969 Loomis Road site in Stockton, California. <br /> The results of the tests conducted during-the above mentioned 20=day period was reported by GTI on <br /> March 5, 2008. SJCEHD in response to this report in their correspondence dated October 17, 2008 <br /> directed GTI to do further tests on Dual Phase Extraction (DPE) methodology as it appears more <br /> effective than bioventing and biosparging and the previous pilot test failed to quantify TPH-Gasoline <br /> # and TPH-Diesel in the extracted soil vapor. GTI submitted the Pilot Test Work Plan,Additional Dual <br /> Phase Extraction Pilot Test, on October 30, 2008. SJCEHD in their correspondence dated December <br />{ 31, 2008 directed GTI to revise the work plan and address the EHD reservations regarding the DPE <br /> test design due to the limited screen lengths of EW-1 and EW-101, and the very limited vadose zone <br /> ` addressed by MW-5 under natural conditions. <br /> - The following work plan explains further DPE tests in detail by considering the above mentioned <br /> EHD reservations.. If you have any questions, please do not hesitate to call me at(209)522-4119. <br /> Respectfully submitted, <br /> Raynold I. Kablanow II, Ph.D. <br /> y� Vice President <br /> cc: Vicki McCartney- SJC PHS/EHD <br /> James L Barton -CRWQCB-CVR <br /> USTCFP <br /> i John Marci,Jr., 2973 Loomis Road, Stockton, CA 95205 <br /> r <br />( <br /> F�� t <br />