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0110SECOR vuww secorcom <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 /> °� � � G�;�� �D <br /> January 23, 2006 IAN 2 3 2006 <br /> Mr Harlin Knoll ENVIRONMENT HEALTH <br /> San Joaquin County Environmental Health Department PERMIT/SERVICES <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Fourth 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 <br /> fourth quarter 2005 (4Q2005) groundwater monitoring event at the above-referenced site <br /> The site, currently occupied by a used car lot, is a former Chevron service station located at <br /> . 575 West Grant Line Road, Tracy, California <br /> COMPLETED ACTIVITIES - FOURTH QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES - FIRST QUARTER 2006 <br /> ■ Conduct quarterly groundwater monitoring and sampling, <br /> ■ Prepare and submit quarterly groundwater monitoring report, and, <br /> • Meet with County personnel to discuss future site activities <br /> DISCUSSION <br /> On October 28, 2005, Gettler-Ryan Incorporated (G-R) performed 4Q2005 groundwater <br /> monitoring and sampling (Attachment A) Groundwater elevations across the site ranged <br /> from 19 46 to 20 57 feet above mean sea level (msl), and increased an average of 0 25 feet <br />\ from the previous sampling event Groundwater flow was calculated to the northwest at an <br /> approximate gradient of 0 006 This is consistent with the previous groundwater flow <br /> gradient and direction 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 are presented below <br /> N lFrleslProlectslChevronlRetarA#9-8632(Tracy)IPanodre Monrtonng4200514QMR0514Q2005 QMR 98632 doc <br />