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SECOR www secorcom <br /> ® INCORPORATED <br /> 3017 Kilgore Road Suite 100 <br /> INCORPORATED Rancho Cordova CA 95670 `{ <br /> 916-861.0400 TEL <br /> • 916-861-0430 FAX <br /> April 29, 2005 MC) � <br /> MAY 0 4 2fl05 <br /> Ms Vicki McCartney EhMRONMENT HEAUN <br /> San Joaquin County) Environmental Health Department <br /> 304 East Weber Avenue, Third Floor PERMIT/SEWCES <br /> Stockton, California 95202-2708 f <br /> RE First Quarter 2005 Groundwater Monitoring Report Y e s ol yk-'F P Ic A <br /> Chevron Station 9-2033 Gev- <br /> 508 West Charter Way '�'� d� �-('.0y' <br /> Stockton, California la 51 vyy-\- <br /> SECOR Project No 77CH 92033 05 <br /> Dear Ms McCartney <br /> SECOR International Incorporated (SECOR), on behalf of ChevronTexaco Environmental <br /> Management Company (EMC) has provided this report to summarize results of the first quarter 2005 <br /> (1Q2005) groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - FIRST QUARTER 2005 <br /> • Conducted quarterly groundwater monitoring and sampling, and, <br /> Prepared and submitted quarterly groundwater monitoring report <br /> f <br /> PLANNED ACTIVITIES - SECOND QUARTER 2005 <br /> • Conduct quarterly groundwater monitoring and sampling, <br /> ■ Prepare and submit quarterly groundwater monitoring report, r <br /> ■ Prepare and submit work plan for additional site assessment, and Y <br /> ■ Initiate additional site assessment activities <br /> DISCUSSION <br /> 3 <br /> On February 8, 2005, Gettler-Ryan Incorporated (G-R) performed 1Q2005 groundwater monitoring <br /> and sampling G-R's groundwater monitoring report is included in Attachment A Depth to <br /> groundwater across the site ranged from 21 96 to 22 54 feet below ground surface (bgs) <br /> Groundwater elevation across the site increased an average of 1 20 feet from the previous sampling <br /> event Groundwater flow was calculated to the northeast at an approximate gradient of 0 009 A <br /> summary of total petroleum hydrocarbons as diesel (TPHd) and as gasoline (TPHg), benzene, and <br /> methyl tertiary butyl ether (MtBE) laboratory analytical data is presented in the Table below <br /> Analysis for TPHd was performed only on the groundwater sample collected from monitoring well <br /> MW-1 Therefore, the detected minimum and maximum concentrations reported for this well are <br /> z�bath 230 NgIL � <br /> M <br /> t <br /> g�t <br /> 1� <br /> N IFrleslProfectsIChevronLRetaiA#9-20331Penodic Monitonng12 MIQ2005 QMR 92033 docSECOR Intemahonal Incorporated <br /> y- <br /> LY� <br />