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SECOR www.secorcom <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E C O R INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-061-0430 Fax <br /> October 22, 2004 <br /> i1 1]i <br /> Mr. Jeffrey Wong J <br /> San Joaquin County OCT 2 5 2004 <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor ENV1R0Ni`,;[i+J i -.1- <br /> Stockton, California 95202 PERTAITISERVICES <br /> RE: Third Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-6258 <br /> 2409 East Main Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.23.0023 <br /> Dear Mr.Wong: <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the results of the third quarter 2004 <br /> (3Q2004)groundwater monitoring event at the above-referenced site. <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2004 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and; <br /> ■ Prepared and submitted quarterly groundwater monitoring report. <br /> PLANNED ACTIVITIES — FOURTH QUARTER 2004 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and; <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Prepare and submit a monitoring well destruction work plan. <br /> DISCUSSION <br /> On July 21, 2004, Gettler-Ryan, Incorporated (G-R) performed 3Q2004 groundwater monitoring and <br /> sampling. G-R's groundwater monitoring report is included in Attachment A. Depth to groundwater <br /> across the site ranged from 54.94 to 55.86 feet below ground surface (bgs). Groundwater elevation <br /> across the site decreased an average of 1.05 feet from the previous sampling event. Groundwater <br /> flow was calculated to the southwest at an approximate gradient of 0.001 to 0.003 feet per foot (ft/ft). <br /> A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl <br /> ether(MtBE) laboratory results are listed below. <br /> I:IChevron1962581Periodic Monitoring120041302004 QMR 96258.doc SECOR International incorporated <br /> 1 � <br />