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"^ <br /> SECOR www secar coin <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 /> October 24, 2005 2005 OCT 25 'PM '1= 57 <br /> SANA 10AQ11 ,! ( ,)d14TY <br /> EHfl'eJ 4iU CSL <br /> Mr Harlin Knoll HEAL FH DL `X i lcli I <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Third Quarter 2005 Groundwater Monitoring Report <br /> Chevron Service Station 9-3232 <br /> 8660 Lower Sacramento Road <br /> Stockton, California <br /> SECOR Project No 77CH 93232 01 <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 third quarter <br /> 2005 (3Q2005) groundwater monitoring event at the above-referenced site The site is <br /> currently a Chevron Service Station located at 8660 Lower Sacramento Road, Stockton, <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 /> ■ Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report <br /> DISCUSSION <br /> On July 1, 2005, Gettler-Ryan Incorporated (G-R) performed 3Q2005 groundwater <br /> monitoring and sampling (Attachment A) Before sampling, the depth to groundwater was <br /> measured in the sampled wells These depths were used to calculate groundwater <br /> elevations Groundwater elevations across the site ranged from -25 31 to -25 77 feet below <br /> mean sea level (ft-msl) Groundwater elevation across the site increased an average of <br /> 2 21 feet from the previous sampling event Groundwater flow was calculated to the <br /> southeast at an approximate gradient of 0 002 to 0 003 A summary of total petroleum ° <br /> hydrocarbons as gasoline (TPHg), benzene, methyl tertiary butyl ether (MtBE), and tertiary } <br /> butyl alcohol (TBA) laboratory analytical data are presented below <br /> r� <br /> N 4FileslProfectslChevronlReta111#8-32321Penodic Mondonng1200513005 QMR doc }i <br /> Ia <br /> I JT <br /> IEP <br />