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SECOR <br /> 3017 Kilgore Road,Suite 100 <br /> C 0 R1i!'CC1R!}OiL=;T Rancho Cordova_CA 95670_ <br /> -916-861-0430 FAX <br /> July 2, 2003 <br /> Jul- n '.' Z003 <br /> i.1\1V1, <br /> PFR 111,SERVIUE <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 1 <br /> RE: Second Quarter 2003 Groundwater Monitoring & Sampling Report <br /> Former Chevron Service Station 9-0557 �'. <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.09.0002 <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated is providing this report to summarize the second quarter 2003 <br /> (2Q2003) groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES - SECOND QUARTER 2003 <br /> • Conducted quarterly groundwater monitoring and sampling. <br /> • Prepared and submitted quarterly groundwater monitoring report. <br /> ■ Abandoned monitoring wells MW-1, MW-2, MW-4, MW-9, MW-9A, MW-9S, MW-10, MW-11, <br /> MW-12 and ozone sparge wells OS-1 S/1 D through OS-4S/4D. <br /> • Removed all above ground and subsurface facilities. <br /> ■ Submitted status demolition report. <br /> ■ Prepared well installation work plan. <br /> PLANNED ACTIVITIES - THIRD QUARTER 2003 <br /> • Conduct quarterly groundwater monitoring and sampling. <br /> ■ Prepare and submit quarterly groundwater monitoring report. <br /> • Prepare well installation work plan. <br /> ■ Install monitoring wells. <br /> DISCUSSION <br /> On April 4, 2003, Gettier-Ryan Incorporated (G-R) performed 2Q2003 groundwater monitoring and <br /> sampling. G-R's groundwater monitoring report is included as Attachment A. Depth to groundwater <br /> across the site ranged from 23.77 to 24.99 feet below ground surface (bgs). Groundwater elevation <br /> across the site increased an average of 0.5 feet from the previous sampling event. Groundwater <br /> flow was to the east/southeast at an approximate gradient of 0.001 to 0.003 foot per feet. A <br /> summary of laboratory results are listed below. <br /> l:tChevronW05571Periodic Monitoring120031202003 QMR 90557.doc SECOR International Incorporated <br />