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QPSECOR www secor corn <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> ® <br /> INCORPORATED Rancho Cordova CA 95670 <br /> 916-861-0400 TEL <br /> . 916-861-0430 FAA <br /> CENE 0 <br /> January 31, 2005 mo E <br /> a � <br /> Ms Vicki McCartneyEKVIr'��NM�KT HEALON <br /> San Joaquin County/Environmental Health Department � � �� Et1llCES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202-2708 <br /> RE Fourth Quarter 2004 Groundwater Monitoring Report 4 <br /> Chevron Station 9-2033 <br /> 508 West Charter Way b <br /> Stockton, California <br /> SECOR Protect No 77CH 00000 23 0009 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR), on behalf of ChevronTexaco Environmental <br /> Management Company (EMC) has provided this report to summarize results of the fourth quarter <br /> 2004 (4Q2004) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FOURTH QUARTER 2004 <br /> • 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, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On November 15, 2004, Gettler-Ryan Incorporated (G-R) performed 4Q2004 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included in Attachment A Depth <br /> to groundwater across the site ranged from 23 30 to 23 57 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 0 63 feet from the previous sampling <br /> event Groundwater flow was calculated to the northeast at an approximate gradient of 0 01 ft/ft A <br /> summary of total petroleum hydrocarbons as gasoline (TPHg), total petroleum hydrocarbons as <br /> diesel, benzene, and methyl tertiary butyl ether (MtBE) laboratory analytical data is presented below <br /> a <br /> I 1Chevron49203XPenod+c Mondonng1200414=04 QMR 92033 doc SECOR International Incorporated <br />