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SECOR 7Kg read3011Kilgore RoSuite 100 <br /> INTERNATIONAL Rancho Cordova CA 95670 <br /> S E C ® R INCORPORATED 916-061-0400 TFL <br /> 916-861-0430 FAx wf <br /> October 26, 2004 IRp E C IE���f E'Ell <br /> 1"1 <br /> Mr Harlin Knoll OCT 2 7 2004 <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor ENVIRONMEN] HEALTH <br /> Stockton, California 95202 PERM I USERVICES <br /> RE Third Quarter 2004 Groundwater Monitoring Report <br /> Former Chevron Station 9-8632 <br /> 575 Grant Line Road <br /> Tracy, California <br /> SECOR Project No 77CH 00000 23 0027 <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 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, 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 July 30, 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 .+m <br /> across the site ranged from 6 08 to 8 63 feet below ground surface (bgs) Groundwater elevation <br /> across the site decreased an average of 0 43 feet from the previous sampling event Groundwater <br /> flow was calculated to the northwest at an approximate gradient of 0 006 feet per foot (ft/ft) A <br /> summary of total petroleum hydrocarbons as diesel (TPHd), total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, methyl tertiary butyl ether (MtBE) laboratory analytical data is listed <br /> below <br /> ,q <br /> a° <br /> r <br /> 11Chevron4986321Penodre Monitonng420040Q2004 QMR 98632 doc SECOR International incorporated <br />