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O® SECOR www secorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 916-061-0400 TEL <br /> 916-861-0430 Fax <br /> f <br /> October 26, 2004 <br /> Mr Harlin Knoll OCT 2 7 2004 <br /> San Joaquin County Environmental Health Department ��VIU1�ffd1C�#T HEATH <br /> 304 East Weber Avenue, Third Floor PERMITSERVICES <br /> Stockton, California 95202 <br /> RE Third Quarter 2004 Groundwater Monitoring Report <br /> Chevron Station 9-8264 <br /> 3775 Tracy Boulevard <br /> Tracy, California <br /> SECOR Project No 77CH 00000 23 0026 <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company has provided this report to summarize the results of the second quarter 2004 (3102004) <br /> 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 <br /> DISCUSSION <br /> On August 18, 2004, Gettler-Ryan Incorporated (G-R) performed 3Q2004 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 9 58 to 11 25 feet below ground surface (bgs) <br /> Groundwater elevation across the site decreased an average of 0 46 feet from the previous sampling <br /> event Groundwater flow was calculated to the northeast at an approximate gradient from 0 001 to <br /> 0 002 feet per foot (ft/ft) A summary of total petroleum hydrocarbons as diesel (TPHd), total <br /> petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether <br /> (MtBE) laboratory analytical data is listed below <br /> 1 lChevron1982644Penodic Moratonng12004OQ2004 QMR 98264 doc SECOR International Incorporated <br />