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,,.,,,L3'1SEC0R <br /> C InternationalIncotporated <br /> P ?: <br /> October 12, 2001 <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: 3"' 2001 Remedial System Evaluation Report <br /> Y p <br /> Chevron Service Station #94275 <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 3" quarter of 2001. <br /> The AS system began operation at the site in April 1997 in conjunction with a soil <br /> vapor extraction (SVE). The SVE system has been disabled and the AS continues to <br /> operate. A brief description and performance evaluation of the remedial system <br /> between June 4, 2001 and September 7, 2001 are presented below. <br /> Inactive 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-1 and GNI-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 f <br /> District Permit No. N-3645-1-0. This permit was rescinded at Chevron's request in <br /> • May, 2001. <br /> 3017 Kilgore Road, Suile 100, Rancho Cordova, GA 95670 916.$61.0400 976.861.0430 Fax 1001I.secor.eoM <br />