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{ 5 <br /> OEk'JlNL <br /> hilei national hicolpOICIteKI <br /> May 18, 1999 <br /> Project No 7GO07-032-01 <br /> Mr Brett Hunter L,S, <br /> C <br /> Chevron Products Company '�� , � 1r9 <br /> P O Box 6004 <br /> San Ramon, California 95843 `9 <br /> �C <�' <br /> Re First Quarter 1999 Remedial System Evaluation Report �S <br /> Chevron Service Station #94275 <br /> 2905 West Benjanun 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 spargmg (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 January 18, 1999 and March 17, 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 Umfied 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 10 <br /> to 9 69 feet below grade on March 10, 1999 The screened intervals for SVE wells start <br /> at 10 to 13 feet below grade (Figure 2), therefore water levels are currently too high for <br /> T� F' the 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 /> • <br /> � � 9912 19 (Nolfltis Pc114'U,,,( Sirrtt 100 Sctciamoiln CA 95827 (910) �6j-h"O (916)-io %cZ Tip (M 1 - -- <br />