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SECOR <br /> www secor com <br /> INTERNATIONAL 3475 West Shaw Ave Suite 104 <br /> ® <br /> INCORPORATED Fresno CA 93711 <br /> 559-271TEL <br /> 559-2715108 5108 FAX <br /> July 18, 2005 <br /> Mr Harlin Knoll JUL 1 9 2005 <br /> San Joaquin County Environmental Health Department ENVIRONMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> RE Second Quarter 2005 Groundwater Monitoring Report <br /> Former Chevron Station 9-8632 <br /> 575 W 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 /> second quarter 2005 (202005) groundwater monitoring event at the above-referenced site <br /> . COMPLETED ACTIVITIES - SECOND QUARTER 2005 <br /> ■ Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> PLANNED ACTIVITIES - THIRD QUARTER 2005 <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On April 29, 2005, Gettler-Ryan Incorporated (G-R) performed 202005 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report is included in Attachment A <br /> Groundwater elevation across the site ranged from 19 54 to 20 74 feet above mean sea <br /> level (msl) Groundwater elevation across the site decreased an average of 0 21 feet from <br /> the previous sampling event Groundwater flow was calculated to the northwest at an <br /> approximate gradient of 0 006 ft/ft A summary of total petroleum hydrocarbons as diesel <br /> (TPHd), total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary <br /> butyl ether (MtBE) laboratory analytical data is presented below <br /> N IFIleslProfectslChevronlRetatA#9-8632(Tracy)1Penodic Mondonrig120054202005 QMR 98632 doc <br /> i <br />