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SECOR <br /> {�TERNF� it fl! 3017 Kilgore Road,Suite 100 <br /> ,� Rancho Cordova,CA 95670 <br /> _ R 916-861-0400 rEL <br /> 916-861-0430 FAR <br /> July 30, 2004 <br /> Ms. Victoria McCartney <br /> San Joaquin County Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> RE: Second Quarter 2004 Groundwater Monitoring Report <br /> Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> SECOR Project No.: 77CH.00000.23.0003 <br /> Dear Ms. McCartney: <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; <br /> ■ Prepared and submitted quarterly groundwater monitoring report, and; <br /> ■ Prepared and submitted Assessment Report. <br /> PLANNED ACTIVITIES - THIRD QUARTER 2004 <br /> i <br /> ■ Conduct quarterly groundwater monitoring and sampling; i <br /> ■ Prepare and submit quarterly groundwater monitoring report, and; <br /> ■ Prepare and submit monitoring well installation work plan. <br /> DISCUSSION <br /> On April 23, 2004, Gettler-Ryan Incorporated (G-R) performed 2Q2004 groundwater monitoring and <br /> sampling. G-R's groundwatef nitoring report is included in Attachment A. Depth to groundwater <br /> across the site ranged from lo 25.28 feet below ground surface (bgs). Groundwater elevation <br /> across the site increased an avpesAt <br /> of 1.85 feet from the previous sampling event. Groundwater <br /> flow was calculated to the southan approximate gradient of 0.001 to 0.005 feet per foot (ft/ft). <br /> A summary of total petroleum hydrocarbons as gasoline (TPHg), benzene, and methyl tertiary butyl <br /> ether (MtBE) laboratory analytical data is listed below. <br /> i <br /> I:1Chevron1905571Periodic Monitoring120041202004 QMR 90557.doc SECOR International Incorporated <br />