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4 <br /> SECOR www secor com <br /> INTERNATiONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95$70 <br /> 916-861.0400 -ML <br /> • 916-861-0430 FAX <br /> October 15, 2004 <br /> Mr Michael InfurnaD <br /> San Joaquin County <br /> Environmental Health Division OCT 15 2004 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ENVIRUNII'JILHI HEALTH <br /> PER101 USERVICES <br /> RE Third Quarter 2004 Groundwater Monitoring Report <br /> Chevron Service Station 9-6171 <br /> 6633 Pacific Avenue <br /> Stockton, California <br /> SECOR Project No 77CH 00000 23 0022 <br /> Dear Mr Infurna <br /> SECOR International Incorporated (SECOR), on behalf of Chevron Environmental Management <br /> Company (Chevron), has provided this report to summarize the third quarter 2004 (3Q2004) <br /> groundwater monitoring event at the above-referenced site <br /> COMPLETED ACTIVITIES -THIRD QUARTER 2004 <br /> • Conducted quarterly groundwater monitoring and sampling, and, <br /> ■ Prepared and submitted quarterly groundwater monitoring report V <br /> PLANNED ACTIVITIES — FOURTH QUARTER 2004 <br /> • Conduct quarterly groundwater monitoring and sampling, <br /> • Prepare and submit quarterly groundwater monitoring report, and <br /> • Prepare and submit a site conceptual model <br /> DISCUSSION <br /> On July 12 and 13th, 2004, Gettler-Ryan Incorporated (G-R) performed 3Q2004 groundwater <br /> monitoring and sampling G-R's groundwater monitoring report Is Included in Attachment A Depth <br /> to groundwater across the site ranged from 37 71 to 39 15 feet below ground surface (bgs) <br /> Groundwater elevation across the site Increased an average of 1 98 feet from the previous sampling <br /> event Groundwater flow was calculated to the east at an approximate gradient of 0 02 to 0 006 feet <br /> per foot) A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl <br /> tertiary butyl ether (MtBE) laboratory analytical data is listed below <br /> 8 <br /> a <br /> I lChevronl9617ilPenodfc Monitonngl200443Q2004 QMR 96171 doc SECOR Intematronal Incorporated <br />