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_t1 <br /> SECOR <br /> 4 <br /> l,tle,WINO„al MCO)pwafecl <br /> r <br /> s <br /> November 3, 1998 <br /> Project No 7GO07-032-01 <br /> Mr Brett Hunter <br /> Chevron Products Company <br /> P O Box 6004 <br /> San Ramon, California 95843 <br /> Re Third Quarter 1998 Remedial System Evaluation Report <br /> Chevron Service Station #94275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California - <br /> Dear Mr Hunter r ° <br /> SECOR International Incorporated (SECOR) has prepared this letter to document the <br /> performance of the soil vapor extraction and air sparging systems operating at the above � <br /> referenced site (Figures 1 and 2 Soil vapor extraction SVE and airs ar in AS <br /> CFS ) P (SVE) P g g ( ) <br /> were initiated at the site by Geraghty and Malier in September 1997 and Apnl 1997, <br /> respectively A brief description and performance evaluation of the remedial system <br /> between June 15 and September 22, 1998 is presented below t1 <br /> r <br /> Soil Vapor Extraction System <br /> The SVE system is comprised of ten SVE wells (VW-1, GM-1 through GM-9), a <br /> 5-horsepower (hp) positive-displacement blower, and a 100 cubic feet per minute (cfm) <br /> catalytic oxidizer The SVE system is operated under Permit No N-3645-1-0 issued by <br /> the San Joaquin County Unified Air Pollution Control District <br /> The SVE system has not been operated at the site since February 1998 because of high <br /> groundwater levels Depth to water in monitoring wells at the site was approximately 10 <br /> feet below grade on September 10, 1998 The screened intervals for SVE wells start at <br /> 10 to 13 feet below grade (Figure 2), so water levels are currently too high for the <br /> effective operation of the SVE system To date, the SVE system has extracted <br /> approximately 70 pounds of gasoline from the soil and groundwater beneath the site <br /> 9912 h,rru,ess I(ok Dnue Sade 100 '�timmjcnlo C1 95827 (916) 364-1880(9/0) 364-78891 11 rr rr rr Necorcom <br />