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ACTON - <br /> MICKELSON - <br /> van DAM, INC. <br /> . Consulting Scientists, Engineers,and Geologists <br /> i <br /> October 17, 1994 <br /> OC 1 'J'-"J4 <br /> �NV7� c <br /> Mr Kenneth Earnest F-� ;`<VIC � <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 19005 1017 <br /> Subject September 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-Monitonng 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 August 31 through September 22, 1994 Included in this report <br /> is a 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 /> Dunng the reporting period, the ground water extraction system discharged 2,415 gallons, for <br /> an average of 110 gallons per day The system was off-line for an undetermined amount of time <br /> because of an apparent electncal service interruption The cumulative volume of ground water <br /> discharged as of September 22, 1994, was 108,030 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 September 15 and 22, 1994, indicated concentrations of TPHg to be 200 <br /> and <50 micrograms per liter (µg11), respectively The concentration of dissolved benzene <br /> LTU 56 mi <br /> 4511 Golden Foothill Parkway,Suite 1 (916)939-7550 <br /> EI Dorado Hills, California 95762 Fax(916) 939-7570 <br />