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_ k _ <br /> 1� <br /> Iy <br /> r rr <br /> _'COR <br /> hac)imliolial liicoil)ozated <br /> 12 <br /> yY i k I <br /> fw�r t <br /> rs��7Y <br /> August 31, 1998 <br /> Project No 7GO07-032-01 f�' <br /> i�b�r4 S <br /> "r'i yrts� <br /> Mr Brett Hunter <br /> Chevron Products Company ; <br /> P O Box 6004 r ;`A <br /> San Ramon, California 95843 <br /> Re Second Quarter 1998 Remedial System Evaluation Report = E ; <br /> Chevron Service Station 99-4275 { <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr Hunter i * <br /> On behalf of Chevron Products Company SECOR International Incorporated (SECOR) <br /> is performing environmental services at the above referenced site (Figures 1 and 2) Soil <br /> • vapor extraction (SVE) and air sparging (AS) were initiated at the site in Septembcr <br /> 1997 and April 1997, respectively A brief description and performance evaluation of r <br /> the remedial system between March 13 and June 15, 1998 is presented below <br /> Soil Vapor Extraction System <br /> The SVE system is comprised of ten SVE wells (VW-1, GM-1 through GM-9), a 5 <br /> horsepower (hp) positive-displacement blower, and a 100 cubic feet per minute (cfm) .7 <br /> electric catalytic treatment unit The SVE system is operated under Permit No N-3645- ' <br /> 1-0 issued by the San Joaquin County Unified Air Pollution Control District <br /> The SVE system has not been operational at the site since February 1998 because of <br /> high water levels Depth to water in monitoring wells at the site was less than 10 feet w ` <br /> below grade on June 24, 1998 The screened intervals for SVE wells start at 10 to 13 �� <br /> feet below grade (Figure 2), so water levels are still currently too high for SVE Data <br /> for historical operation of the SVE system are summarized in Table 1 <br /> Air Sparging System <br /> The AS system is comprised of nine AS wells (GM-1 through GM-9) and a 1 5 hp rotary <br /> vane compressor The AS system alternately infects air into wells GM-1 thiough GM-5 <br /> fi sr <br /> and wells GM-6 through GM-9 <br /> n <br /> f <br /> .pM i <br /> 36�-1880 364-T889 FAA a tuu{;ecoreom <br /> 991213iw?ie,�I-Ia?D te, Suite 100 Sawonento CA 95827 (916) + <br /> n��i <br />