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1, <br /> SECOR www secor com i <br /> (� INTERNATIONAL 3475 West Shaw Ave Suite 104 <br /> S E C ® R INCORPORATED Fresno CA 93711 <br /> 559-271-2650 TEL <br /> 559-2715108 FAX ' <br /> 1005 OCT 3 1 PM 2= 27 <br /> October 28, 2005 S A N J 1)A G i'I„ C 0 U;N; Y <br /> ENVId0-411LIN-1 AL <br /> HEALTH DEP;,RTMENT <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 `FO�t�� L� <br /> J <br /> RE Third Quarter 2005 Groundwater Monitoring Report <br /> Chevron Service Station 9-8264 <br /> 3775 Tracy Boulevard <br /> Tracy, California <br /> SECOR Project No 77CH 98264 00 <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 /> third quarter 2005 (3Q2005) groundwater monitoring event at the above-referenced site <br /> The site is currently a Chevron service station located at 3775 Tracy Boulevard, Tracy, <br /> 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 /> t <br /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On July 28, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater <br /> monitoring and sampling (Attachment A) Groundwater elevation across the site ranged <br /> from 6 84 to 7 06 feet above mean sea level (msl) and decreased an average of 1 52 feet <br /> from the previous sampling event The potential for groundwater flow was calculated to the <br /> northeast at an approximate gradient of 0 002 A summary of total petroleum hydrocarbons <br /> as diesel (TPHd), total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl <br /> tertiary butyl ether (MtBE) laboratory analytical data are presented below <br /> N 4FileslProjects4ChevmnlRetajA#9-82641Penodic Monitonn9120051302005 QMR doc <br />