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SECOR tiv. a i c i <br /> �-y INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> E C i0. NCORPORATI-D Rancho Cordova CA 95670 <br /> '�� � L�J� 16-061 0400 rcL <br /> . t�r��I016-861-0430 FAx <br /> L <br /> JAN 2 6 2005 <br /> January 24, 2005 ENVIRONMENT HEALTH <br /> PERMIT/SERMES <br /> Ms Victoria McCartney <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Fourth Quarter 2004 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No 77CH 00000 23 0003 <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 fourth quarter 2004 <br /> (4Q2004) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FOURTH QUARTER 2004 <br /> . Conducted quarterly groundwater monitoring and sampling, <br /> ■ Prepared and submitted quarterly groundwater monitoring report, and, <br /> ■ Prepared and submitted assessment work plan <br /> PLANNED ACTIVITIES - FIRST QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On November 10, 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 <br /> to groundwater across the site ranged from 25 27 to 27 18 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 0 6 feet from the previous sampling <br /> event Groundwater flow was calculated to the southeast at an approximate gradient of 0 002 to <br /> 0 01 ft/ft A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl <br /> tertiary butyl ether(MtBE) laboratory analytical data is listed below <br /> 1 4Chev=1905574Penodre Monitonng120041402004 (QMR 90557 doc SECOR Intemabonal Incorporated <br />