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ACTON • <br /> MICKELSON • r ,., 0 •�� , NAf-TfI <br /> . van DAM, INC. " `� <br /> 6 PM enilBelting Scientists, Engineers,and Geologists <br /> February 2, 1995 <br /> Mr Kenneth Earnest <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19005 1017 <br /> Subject January 1995 Self-Monitoring Report for Former Beacon Station #494 <br /> 2185 East Fremont Street, Stockton, California <br /> Dear Mr Earnest �}3� �•1,1p <br /> `Q 5 <br /> Acton e 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 December 16, 1994 through January 26, 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 /> 16,239 gallons, for an average of 396 gallons per day The cumulative volume of ground water <br /> discharged as of January 26, 1995 was 153,799 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 January 12 and 26, 1995 indicated concentrations of TPHg to be c 50 <br /> micrograms per liter (Ag/l) and 66 pg/l, respectively The concentration of dissolved benzene <br /> ranged from 0 57 µg/l on January 12 to 12 µg/l on January 26, 1995 Enclosure A contains <br /> copies of the laboratory analytical reports and chain-of-custody forms <br /> Irpe039 dmc <br /> 4511 Golden Foothill Parkway,Suite 1 (916)939-7550 <br /> El Dorado Hills, California 95762 Fax(916)939-7570 <br />