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SECOR www sccor 00171 <br /> INTERNATIONAL <br /> S E C O R INCORPORATED 3017 Kilgore Road,Suite 100 <br /> Rancho Cordova CA 95670 <br /> 916-861 0400 TEL <br /> 816 861 0430 rnx <br /> January 13, 2005 � CIE%S <br /> "SID <br /> n5 <br /> Mr Jim Barton 3 '14 1 7n <br /> Regional Water Quality Control Board <br /> Central Valley Region gpv 1� ER\0-5 <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, California 95670 <br /> RE Fourth Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SECOR Project No 77CH 00000 23 0022 <br /> Dear Mr Barton <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the fourth quarter 2004 (4Q2004) <br /> groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FOURTH QUARTER 2004 <br /> i • Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES — FIRST QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, <br /> ■ Prepare and submit quarterly groundwater monitoring report, and <br /> ■ Prepare and submit a site conceptual model <br /> DISCUSSION <br /> On October 11, 2004, Gettler-Ryan Incorporated (G-R) performed 4Q2004 groundwater monitoring <br /> and sampling G-R's groundwater monitoring report is included in Attachment A Depth to <br /> groundwater across the site ranged from 38 41 to 42 99 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 3 86 feet from the previous sampling <br /> event Groundwater flow was in a westerly direction at an approximate gradient of 0 01 to 0 04 feet <br /> per foot A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl <br /> tertiary butyl ether(MtBE) laboratory analytical data is presented below <br /> • <br /> I lChevron1961711Penodre Monitonng1200444Q2004 QMR 96171 doc SECOR International Incorporated <br /> I <br />