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ACTON • <br /> MICKELSON • <br /> van DAM, INC. V <br /> Consulting Scientists, Engineers, and 6e 491s� <br /> March 3, 1995 .0 <br /> t <br /> Mr Kenneth Earnest <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19005 1017 <br /> Subject February 1995 Self-Monitoring Report for Former 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 January 26, 1995 through February 23, 1995 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 /> 16,152 gallons, for an average of 577 gallons per day The cumulative volume of ground water <br /> discharged as of February 23, 1995 was 169,951 gallons <br /> Per the requirements outlined to 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 penod 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 February 15 and 23, 1995 indicated concentrations of TPHg to be <50 <br /> micrograms per liter (µg11) for both sampling events The concentration of dissolved benzene <br /> ranged from 0 99µg/l on February 15 to 0 59 µgll on February 23, 1995 Enclosure A contains <br /> copies of the laboratory analytical reports and chain-of-custody forms <br /> i <br /> lrpto47 dmc <br /> 4511 Golden Foothill Fark�vay, Suite l (916) 939-7550 <br /> El Dorado Hills, Cahrornia 95762 Fax (916) 939-7570 <br />