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�1SECOR www secor cam <br /> INTERNATIONAL 3475 West Shaw Ave Suite 104 <br /> S E C ® R INCORPORATED Fresno,CA 93711 <br /> 559-271-2650 TEL <br /> 559-271-5108 FAX <br /> 205 OCT 3 1 PM 2: 27 <br /> October 28, 2005 5mH Y)AOUIN , pUNfY <br /> �i�< ur�LEITAL <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department p <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Third Quarter 2005 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-8632 <br /> 575 West Grant Line Road <br /> Tracy, California <br /> SECOR Project No 77CH 98632 02 <br /> Dear Mr Knoll <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental <br /> Management Company (EMC) has provided this report to summarize the results of the third <br /> quarter 2005 (3Q2005) groundwater monitoring event at the above-referenced site The <br /> site, currently occupied by a used car lot, is a former Chevron service station located at 575 <br /> West Grant Line Road, Tracy, California <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES - FOURTH QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On July 29, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater <br /> monitoring and sampling (Attachment A) Groundwater elevations across the site ranged <br /> from 19 01 to 20 33 feet above mean sea level (msl), and decreased an average of 0 36 <br /> feet from the previous sampling event Groundwater flow was calculated to the northwest <br /> at an approximate gradient of 0 005 to 0 01 This is consistent with previous groundwater <br /> flow gradient and direction A summary offtotal petroleum hydrocarbons as diesel (TPHd), <br /> total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl ether <br /> (MtBE) laboratory analytical data are presented below " <br /> i <br /> Y <br /> x3y <br /> a <br /> N 1FileslProjectslChevronlRetatll#9-8632(Tracy)1Penodre Monitonng120051302005 QMR 98632 doc , <br /> z <br /> J <br />