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r <br /> ACTON • <br /> MICKELSON • <br /> van DAM, INC. 'dV1RC'��-'Fh1TAL HEALT11 <br /> Consulting Scientists, Engineers,and Geologists <br /> 95) JAN -3 PK 1: 31 <br /> December 30, 1994 <br /> Mr Kenneth Earnest <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19005 1017 <br /> Subject December 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 measurements and <br /> analyses during the period from November 30 through December 16, 1994 Included in this <br /> . report is a summary of the ground water extraction system performance as monitored during <br /> routine 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 /> 5,845 gallons, for an average of 365 gallons per day The cumulative volume of ground water <br /> discharged as of December 16, 1994, was 137,560 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 December 7 and 16, 1994, indicated concentrations of TPHg to be <50 <br /> micrograms per liter (µgll) for both sampling events The concentration of dissolved benzene <br /> ranged from 94 µg/l on December 7 to 66 µg11 on December 16, 1994 Enclosure A contains <br /> copies of the laboratory analytical reports and chain-of-custody forms <br /> 1cpt025 ksw <br /> 4511 Golden Foothill Parkway, Suite 1 (916)939-7550 <br /> EI Dorado Hills,California 95762 Fax (916) 939.7570 <br />