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ACTON <br /> MICKELSON • <br /> van DAM, INC. <br /> - Consulting Scientists,Engineers, and Geologists <br /> July 7, 1994 <br /> Mr. Kenneth Earnest <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 19005.1017 <br /> Subject: June 1994 Self-Monitoring Report for Beacon Station #494 <br /> 2185 East Fremont Street, Stockton, California <br /> Dear Mr. Earnest: <br /> Acton • Mickelson • van Dam, Inc. (AMV), prepared this Self-Monitoring Report for Ultramar <br /> Inc. (Ultramar), as required by the provisions of the City of Stockton Self-Monitoring Program <br /> for discharge to the sanitary sewer. This report presents the results of all measurements and <br /> analyses during the period from May 31 through June 22, 1994. Included in this report is a <br /> summary of the ground water extraction system performance as monitored during routine <br /> operation and maintenance activities. <br /> Operation of the ground water extraction system during the reporting period resulted in no <br /> violations of the waste discharge requirements. <br /> Compliance Evaluation Summary <br /> During the reporting period, the ground water extraction system ran continuously and discharged <br /> 11,681 gallons, for an average of 531 gallons per day. The cumulative volume of ground water <br /> discharged as of June 22, 1994, was 82,539 gallons. <br /> Per the requirements outlined in the Self-Monitoring Program sampling schedule, ground water <br /> extracted at the site (Figure 1) by continuously pumping monitoring well MW-3 was sampled <br /> twice during the reporting period for laboratory analysis of benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) and total petroleum hydrocarbons as gasoline (TPHg). Analytical results for <br /> samples collected on June 9 and 22, 1994, indicated concentrations of TPHg to be 1,200 <br /> micrograms per liter (µg11) and 350 µg/l, respectively. The concentration of dissolved benzene <br /> ranged from 100 µg11 on June 9 to 11 14g/1 on June 22, 1994. Enclosure A contains copies of <br /> the laboratory analytical reports and chain-of-custody forms. <br /> 1rPt110.mj <br /> 4511 Golden Foothill Parkway,Suite 1 (916)939-7550 <br /> El Dorado Hills,California 95762 Fax (916)939-7570 <br />