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i <br /> SECOR www.secor.com <br /> S <br /> R INTERNATIONAL 3017 Kilgore Road,Suite 100 E C 0 R INCORPORATED Rancho- 4rdova,CA 95670 <br /> 816-861-0400 ML <br /> 916-861-0430 FAx <br /> I <br /> July 30, 2004 <br /> ROWED <br /> Ms. Victoria McCartney <br /> I San Joaquin County Environmental Health Division JUL Q 2004 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ENVIRONMENT HEALTH <br /> i PERMIT/SERVICES <br /> RE: Second Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-1452 , <br /> 334 East Main Street <br /> Ripon, California <br /> SECOR Project No.: 77CH.00000.23.0006 1 t8 <br /> Dear Ms. McCartney: I <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management Y <br /> Company (Chevron), has provided this report to summarize the secondquarter 2004 (2Q2004) <br /> groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES — SECOND QUARTER 2004 <br /> t ■ Conducted quarterly groundwater monitoring and sampling, and; <br /> ■ Prepared and submitted quarterly groundwater monitoring report. <br /> rte"` <br /> PLANNED ACTIVITIES —THIRD QUARTER 2004 . <br /> ■ Conduct quarterly groundwater monitoring and sampling; <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Reinitiate batch extraction. <br /> GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> i <br /> I <br /> On May 11, 2004, Gettler-Ryan Incorporated (G-R) performed 2Q2004 groundwater monitoring and <br /> sampling. G-R's groundwater monitoring report is included in Attachment A. Depth to groundwater <br /> across the site ranged from 29.97 to 33:25 feet below ground surface (bgs). The groundwater <br /> elevation across the site increased an average of 0.72 feet from the previous sampling event. The <br /> i groundwater flow direction was reported to the northwest at an approximate gradient of 0.002 to <br /> 0.006 feet per foot (ft/ft). A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> and methyl tertiary butyl ether(MtBE) laboratory analytical data is listed below. <br /> ,t l:lChevron1974521Periodic Monitoring120041202004 QMR 91452.doc SECOR International incorporated <br /> 4 <br /> k <br />