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R <br /> ACTON • <br /> MICKELSON • <br /> van DAM, INC. s <br /> I Consulting Scientists, Engineers,and Geo`Ingists <br /> September 12, 1994 <br /> SEP 4 iS�94 <br /> ENVIRONMEPT!1' "Eq'TH <br /> Mr. Kenneth Earnest PERMITISEs1�4C t:5 <br /> Ultramar Inc. _ <br /> 525 West Third Street <br /> ,a <br /> Hanford, California 93.230 19005.1017 <br /> Subject: . August 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 prouisiQns of the City o€'Stocktori'Self-Monitoring Program <br /> far discharge to the sanitary sewer. This report presents-the, results of all measurements and <br /> . analyses during the period from July 204hrough August 31;,'.4994. Included in this report is a <br /> summary of the ground water extraction system 'performan a as'monitored during routine <br /> operation and maintenance activities. <br /> Operation of the groundwater 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 /> 14,4.43 gallons for an,:averao of 344-pllotis per�day.' The'cumulative volume of ground water <br /> discharged as of August 31, f 994,.-.was 105,615 gallons. <br /> Pere requirements outlined in the Self-Monitoring Program saiinpling"schedule, ground water '- <br /> extracted at..,the�`.sib+ ,;;(Figure -1) by continuously pumping monitoring well MW-3 was sampled <br /> threz,,t the <br /> n 5li uey . <br /> , <br /> arldylene (BTEX) andt tal petroleum hydroearbaagasoa (TPHg.) Analyticresults <br /> for sarhples collected on .August,4, 12, and41, 1994,,indicated. concentrations-of TPHg to be <br /> 420, '<5 0;. <50 micrograms per liter (µg11), fespectively. ",T116'concentratic)rf-of dissolved <br /> benzene ranged from 21 µgIl on August 4 to G 0.50 µg11 on August 31, 1994. Enclosure A <br /> Irpt138.mj <br /> i <br /> 4511 Golden Foothill Parkway,Suite 1 (916)939-75$0 <br /> El Dorado Hills,California 95762 Fax (916)939-7570 <br />