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r k <br /> SECOR V, <br /> !N7FRNAI10 NA <br /> 3475 West Shaw Ave.,Suite 104 <br /> s` <br /> iq I.+'CG Z'G OR Fresno,CA 93711 <br /> 559-271-2650 TEL <br /> . 559-271-5108 FAX <br /> October 27, 2005 <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Third Quarter 2005 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.90557.08 <br /> 1 <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental <br /> Management Company (CEMC), has provided this report to summarize the third quarter <br /> 2005 (3Q2005) groundwater monitoring event at the above-referenced site. The site is <br /> • currently a vacant lot located at 139 South Center Street, Stockton, California, is a former <br /> Chevron Service Station. <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling; <br /> ■ Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Submitted permits for cone penetrometer testing (CPT) and monitoring well <br /> installation. <br /> PLANNED ACTIVITIES - FOURTH QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and; <br /> ■ Prepare and submit quarterly groundwater monitoring report. <br /> DISCUSSION <br /> On August 29, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater <br /> monitoring and sampling (Attachment 1). Groundwater elevations across the site ranged <br /> from -12.26 to -13.20 feet below mean sea level (msI), and increased an average of 0.809 <br /> feet from the previous sampling event. Groundwater flow was calculated to the southeast <br /> iat an approximate gradient of 0.002 to 0.005. <br /> N:1Chevron1905571PeriodicMonitoring1200513Q2005 QMR 905573Q2005 QMR 90557 <br />