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SECOR vvvwv secor com <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 r iI <br /> S E C ® R iNCORPORATEt7 Rancho Cordova CA 95670 <br /> 916$61-0400 TTL ; <br /> 916-861-0430 FAX <br /> July 30, 2004 <br /> Mr Harlin Knoll , <br /> San Joaquin County Environmental Health Department Ii�1 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE Second Quarter 2004 Groundwater Monitoring Report <br /> Chevron Station 9-3232All <br /> 8660 Lower Sacramento Road +' <br /> Stockton, Californiatiy� <br /> SECOR Project No 77CH 00000 23 0016 ' <br /> Dear Mr Knoll BI <br /> SECOR International Incorporated (SECOR) on behalf of Chevron Environmental Management <br /> Company (Chevron) has provided this report to summarize the second quarter 2004 (2Q2004) <br /> groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES - SECOND QUARTER 2004 <br /> Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report <br /> Vf''� <br /> PLANNED ACTIVITIES —THIRD QUARTER 2004 <br /> • Conduct quarterly groundwater monitoring and sampling, and, <br /> ■ Prepare and submit quarterly groundwater monitoring report ' <br /> 5 <br /> DISCUSSION <br /> On April 9, 2004, Gettler-Ryan Incorporated (G-R) performed 2Q2004 groundwater monitoring and , <br /> sampling G-R's Groundwater monitoring report is Included in Attachment A Depth to groundwater , J <br /> across the site ranged from 37 33 to 38 91 feet below ground surface (bgs) Groundwater elevation <br /> across the site increased an average of 1 35 feet from the previous sampling event Groundwater rf rF <br /> flow was calculated to the southeast at an approximate gradient of 0 001 to 0 004 feet per foot (ft/ft) <br /> Ten wells were sampled during this event A summary of total petroleum hydrocarbons as gasoline <br /> (TPHg), benzene, methyl tertiary butyl ether (MtBE), and tertiary butyl alcohol (TBA) laboratory <br /> analytical data Is listed below <br /> II <br /> 11Chevron1932321Penodic Monrtonng1200412Q2004 QMR 93232 doc SECOR International Incorporated <br /> I I <br /> i <br /> I <br /> 'i I <br />