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I SECOR 1111c i ImIlmlell 111C U1 j)cl](l1CC� u. FIR 24 1128 March 20, 2000 Project 077 41672 001 Mr Bob Cochran Chevron Products Company P O Box 6004 San Ramon, California 95843 Re Fourth Quarter 1999 Remedial System Evaluation Report Chevron Service Station #9-4275 2905 West Benjamin Holt Drive Stockton, California Dear Mr Cochran SECOR International Incorporated (SECOR) has prepared this letter on behalf of Chevron Products Company (Chevron) to document the performance of the soil vapor extraction and air sparging systems operating at the above referenced site (Figures 1 and 2) Soil vapor extraction (SVE) and air sparging (AS) were initiated at the site by Geraghty and Miller in September 1997 and April 1997, respectively A brief description of the remedial system, and performance evaluation of the remedial system for the fourth quarter of 1999 are presented below Soil Vapor Extraction System The SVE system is comprised of ten SVE wells (VW-1, GM-1 through GM-9), a 5- horsepower (hp) positive-displacement blower, and a 100 cubic feet per minute (cfm) catalytic oxidizer The SVE system is operated under Permit No N-3645-1-0 issued by the San Joaquin County Unified Air Pollution Control District The SVE system has not been operated at the site since February 1998 due to high groundwater levels Depth to water in the monitoring wells at the site ranged from 10 24 to 12 96 feet below ground surface on December 16, 1999 The screened intervals for SVE wells start at 10 to 13 feet below grade (Figure 2), therefore water levels are currently too high for the effective operation of the SVE system To date, the SVE system has e-ctrac.ted approximately 70 pounds of gasoline from the soil and groundwater beneath the site 99/21i11uo11 " P(114 /)111( 511'Ic 100 Sctclmuc111(, C 1 95h27 (9/6) X01 /,SS0 (9/0) ,61 1,Sh91(1t 111111 �1culcunl