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{ SECOR www.secorcom <br /> "ApINTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> ! Rancho Cordova,CA 95670 <br /> O INCORPORATED 916-861-0400 TEL <br /> k"V916-861-0430 FN( <br /> pERMR� fe'4-/Vl. <br /> , ��1 ry <br /> .,�. <br /> January 24, 2005 <br /> u <br /> Ms. Victoria McCartney .� <br /> San Joaquin County Environmental Health Division n�' <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Fourth 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 <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated (SECOR), on behalf;; of ChevronTexaco Environmental <br /> Management Company (EMC), has provided this report to.summarize the results of the fourth <br /> quarter 2004 (4Q2004) groundwater monitoring event at the above-referenced site. <br /> I <br /> COMPLETED ACTIVITIES— FOURTH QUARTER 2004 <br /> Conducted quarterly groundwater monitoring and sampling; <br /> ■ Prepared and submitted quarterly groundwater monitoring report; <br /> Continued weekly batch extraction. <br /> • Prepared and submitted well search report, and; <br /> Prepared and submitted assessment work plan. r <br /> I <br /> PLANNED ACTIVITIES — FIRST QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling; <br /> Prepare and submit quarterly groundwater monitoring report; <br /> ■ Continue weekly batch extraction, and; <br /> Prepare and submit work plan for additional assessment. <br /> j GROUNDWATER MONITORING AND SAMPLING RESULTS <br /> On November 18, 2004, Gettler-Ryan Incorporated (G-R) performed 4Q2004 groundwater <br /> monitoring and sampling. G-R's groundwater monitoring report is included in Attachment 1. Depth to <br /> groundwater across the site ranged from 30.34 to 33.85 feet below ground surface (bgs).�The <br /> k groundwater elevation across the site increased an average of 2.1 feet from the previous sampling <br /> i event. The groundwater flow direction varies at an approximate gradient of 0.001 to 0.007 ft/ft.�A <br /> summary of total petroleum hydrocarbons as gasoline (TPHg}, benzene, and methyl tertiary butyl <br /> I _ ether(MtBE) laboratory analytical data is listed below. <br /> kl <br /> I.lChev=1914524Periodic Mo taring1200414Q2004 QMR 91452.doc SECOR International Incorporated <br /> II _ <br /> I - -w <br />