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!� SECOR wwwsecorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 r <br /> IS E C ® R INCORPORATED Rancho Cordova CA 95670da <br /> 916-861-0400 TFC I '� <br /> 916-861-0430 Fax � <br /> F <br /> January 31, 2005 <br /> s� <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department FEB 0 2 2005 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ENVIRONMENT HEALTH <br /> PERMITISEWCES <br /> RE Fourth Quarter 2004 Groundwater Monitoring Report <br /> Chevron Station 9-3232 <br /> 8660 Lower Sacramento Road <br /> Stockton, California <br /> SECOR Project No 77CH 00000 23 0016 <br /> Dear Mr Knoll <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 /> r <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 October 9, 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 44 23 to 45 65 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 2 26 feet from the previous sampling <br /> event Groundwater flow varies at an approximate gradient of 0 003 to 0 01 ft/ft Seven wells were <br /> sampled during this event A summary of total petroleum hydrocarbons as gasoline (TPHg), `E <br /> benzene, methyl tertiary butyl ether (MtBE), and tertiary butyl alcohol (TBA) laboratory analytical <br /> data Is presented below <br /> b <br /> 67ppe <br /> �x <br /> r,. <br /> I� <br /> I 1ChevronW32321Perrodre Monftonng1200414Q2004 QMR 93232 doc SECOR International Incorporated <br /> C <br /> I § <br /> �I <br /> r ; <br /> r <br />