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CONDOR EARTH TECHNOLOGIES, INC. <br /> .I r 188 Frank West Circle, Suite I <br /> Stockton, CA 95206 <br /> Phone 209.234.0518 <br /> CONDOR Fax www.condorearth.com CONDOR www.condarearth.com <br /> April 23 , 2013 <br /> Kerry Wasson <br /> San Joaquin County <br /> 44 N. San Joaquin Street, Suite 540 <br /> Stockton, CA 95202 <br /> RE: Review of SJCEHD Files for 602 N. California Street <br /> Condor Job No. 5960B <br /> Dear Ms. Wasson, <br /> Condor reviewed historic files for 602 N. California Street in an effort to further investigate possible <br /> sources of the release at 630 N. California Street. The underground storage tanks (USTs) at 602 N. <br /> California Street were removed in 1991 , including the waste oil UST. The waste oil UST was 550 gallons <br /> and was located immediately north of the shop building. Samples collected from soil beneath the UST <br /> were not visibly impacted, and laboratory analytical results indicated no constituents of concern. <br /> Condor therefore concludes that the former waste oil UST at 602 N. California Street does not appear to <br /> be a likely source for the release at 630 N. California Street. Please let me know if you have any further <br /> questions. <br /> Sincerely, <br /> CONDOR EARTH TECHNOLOGIES, INC. <br /> Alex Dewitt, PG <br /> Division Manager <br /> CC: SJCEHD-Lisa Medina <br /> X.\Project\5000_jrj\5960 SJC UST RFQ\5960B County of San Joaquin - Records Center\CorrespondenceT 20130423 Wasson SJCEHD <br /> Files.docx <br />