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1I� S�COf2 ' �' <br /> NI{("N" 10 il3 3017 K119o1e Road Suite 100 <br /> J" CZ;w J0 L Rancho Cordova CA 95670 <br /> 916-061-0400 nL <br /> 916-861-0430 FAX <br /> October S, 2004 <br /> Ms Victoria McCartney <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Third 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 Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the third quarter 2004 (3Q2004) <br /> groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES -THIRD 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 - FOURTH QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> = Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On August 12 and 13, 2004, Gettler-Ryan Incorporated (G-R) performed 3Q2004 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included to Attachment A Depth <br /> to groundwater across the site ranged from 24 74 to 26 61 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 1 42 feet from the previous sampling <br /> event Groundwater flow was calculated to the southeast at an approximate gradient of 0 002 to <br /> 0 006 feet per foot (ft/ft) A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> and methyl tertiary butyl ether(MtBE) laboratory analytical data is listed below <br /> I IChevron1905571Penodlc Monrtonng1200413Q2004 QMR 90557 doc SECOR International Incorporated <br />