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w <br /> Y SECOR <br /> r <br /> 'ITI <br /> r'!,Ajf International Incorporated <br /> 4 <br /> -7 PN 2: 29 <br /> March 4, 2002 <br /> Project 077 43508 570 <br /> Mr Bob Cochran <br /> Chevron Products Company <br /> P O Box 6004 <br /> San Ramon, California 95843 <br /> Re 4t 2001 Remedial System Evaluation Report <br /> Chevron Service Station#9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton, California <br /> Dear Mr Cochran <br /> SECOR International Incorporated (SECOR) presents with this letter operational data <br /> for air sparge (AS) system operating at the subject site (Figure 1), and an evaluation of <br /> the remedial systems effectiveness during the 4h quarter of 2001 <br /> The AS system began operation at the site in April 1997 in conjunction with a soil vapor <br /> extraction (SVE) The SVE system has been disabled and the AS continues to operate <br /> A brief description and performance evaluation of the remedial system between June 4, <br /> 2001 and September 7, 2001 are presented below <br /> Lnactive Soil Vapor Extraction System <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 5 94 <br /> to 8 0 feet below ground surface on March 1, 2000 The screened intervals in the SVE <br /> wells range from 10 to 13 feet below ground surface (bgs) (Figure 2), therefore water <br /> levels are currently too high for the effective operation of the SVE system Prior to <br /> shutdown, the SVE system has extracted approximately 70 pounds of gasoline from the <br /> soil and groundwater beneath the site <br /> The inactive SVE system is comprised of ten SVE wells (VW-I and GM-1 through <br /> GM-9), buried mechanical piping, a 5-horsepower(hp) positive-displacement blower, <br /> and a 100-cubic feet per minute (cfm) catalytic oxidizer(Figure 2) The SVE system <br /> was permitted to operate under San Joaquin County Unified Air Pollution Control <br /> District Permit No N-3645-1-0 This permit was rescinded at Chevron's request in <br /> May 2001 <br /> 3017 Kilgore Road, Suite 100, Rancho Cordova, CA 95670 916 861 0400 916 861 0430 Fax www secor com <br />