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SECOR <br /> fir 11r1c111alrowd lncorpolaterl <br /> PM I? 32 <br /> September 1, 1999 <br /> Project No 077 41672 001 <br /> Mr Brett Hunter <br />--�- - _ -Chevron-Products Company- <br /> P O Box 6004 <br /> San Ramon, California 95843 <br /> Re Second Quarter 1999 Remedial System Evaluation Report <br /> Chevron Service Station#9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California - <br /> Dear Mr Hunter <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 air sparging (AS) <br /> were initiated at the site by Geraghty and Miller in September 1997 and April 1997, <br /> respectively A brief description and performance evaluation of the remedial system <br /> between April 16, 1999 and June 11, 1999 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 <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 due to high <br /> groundwater levels Depth to water in the monitoring wells at the site ranged from 7 49 <br /> to 11 ll feet below ground surface on June 22, 1999 The screened intervals for SVE <br /> wells start at 10 to 13 feet below grade (Figure 2), therefore water levels are currently <br />- too thigh for the effective operation of the SVE system To date, the SVE system has <br /> extracted approximately 70 pounds of gasoline from the soil and groundwater beneath <br /> the site <br /> 9912 Pet)11)lct 11111( 100Sacicrnrclrlo�C�a 97,ti27 (916) )04-1,1,,5O (91r) 361 18,S9lak ititr1 +ccop c0)?, - <br />