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12/06/2004 17:39 2095224227 GEOLOGICAL TECHNICS PAGE 02 <br /> CTC010giUl TeChAia IfLC. <br /> 1107 7"St. <br /> Modesto,CRUOnda 95354 <br /> (209)522-1119/Fax(209)522.4227 <br /> November 3,2004 <br /> GTI Project No.: 750.2 <br /> GTT Project Name: City of Escalon <br /> Ms Lisa Middleton <br /> San Joaquin Valley Air Pollution Control District(SJVAPCD) <br /> 4230 Kiernan Ave.,#130 <br /> Modesto, California 95356-9322 <br /> RE: Authority To Constrict(N-4546-2-1) <br /> City of Escalon(Former Arco Mini Mart), 1305 Escalon,Ave.,Escalon,CA <br /> Dear Ms Middleton,: <br /> Attached are copies of the laboratory data (Air Toxics) for the influent and effluent air samples <br /> Collected on September 24, 2004 from the Soil Vapor Extraction—Granulated Activated Carbon <br /> System (SVE). The SVE was started and air samples collected in the presence of San Joaquin <br /> County Environmental Health Department (SJCEHD) and SJVAPCD personnel on September <br /> 24, 2004. <br /> During the initial inspection Ms Middleton requested that the initial laboratory sample analysis <br /> be submitted to the SJVA.PCD in accordance to ATC N-4546-2-1 Section 15. Ms Middleton <br /> stated that the submission of ,monthly and annual reports is not required. As per the ATC, <br /> records of all site activities, field measurements, laboratory results and other compliance <br /> .requirem,ents are kept by GTI and are available for SJVAPCD inspection upon request. <br /> • Flow rate at,initial inspection was 182 cfm <br /> • Calculations indicate the system,is operating at 99.7%efficiency <br /> • Calculations indicate VOC emissions from, the soil remediation system have a cumulative <br /> total of 1.06 pounds in 40 days of operation <br /> * As of November 3, 2004, GT.[ estimates that 125 pounds of TPH-G, BTEX and MtBE <br /> constituents have been removed from the subsurface by the SVE <br /> If you should have any questions regarding this project, please contact Ray Kablanow or myself. <br /> Respectfully Submitted, <br /> ryEOWQICU 7LCNNICSINC <br /> Eric L. Price <br /> Geologist <br /> Cc: Lori Duncan—SIC PHS/EHD <br /> Gordon Boggs—RWQCB-CVR <br /> Doug Stidham—City of Escalon <br /> USTCFP <br />