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SECOR <br /> C'j�? f r '1 f� f <br /> 9!_ r '.' l 16 l f 1 51 <br /> February 10, 1999 <br /> Project No 7G007-032-01 <br /> Mr Brett Hunter <br /> Chevron Products Company <br /> P O Box 6004 <br /> San Ramon, California 95843 <br /> Re Fourth Quarter 1998 Remedial System Evaluation Report <br /> Chevron Service Station 99-4275 <br /> 2905 West Benjamin Holt Dave <br /> s 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 October 20, 1998 and December 11, 1998 is presented below <br /> Soil Vapor Extraction System <br /> The SVE system is comprised often SVE wells (VW-1, GM-1 through GM-9), a <br /> 5-horsepower (lip) 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 because of high <br /> 1 <br /> groundwater levels Depth to water in monitoring wells at the site was approximately 10 <br /> feet below grade on December 17, 1998 The screened intervals for SVE wells start at <br /> 10 to 13 feet below grade (Figure 2), so water levels are currently too high for the <br /> effective operation of the SVE system To date, the SVE system has extracted <br /> approximately 70 pounds of gasoline from the soil and groundwater beneath the site <br /> 9912 Buuness Park Dr t e Sulle 100 Sacrcxmo7lo CA 95827 (970) 30-4-7880(910) 304 18891 1\ it n u wcorcom <br />