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E <br /> 4 3 <br /> PROBLEM ASSESSMENT REPORT <br /> ° Moore Petroleun, Inc. <br /> 14800 11. Frontage Road, Manteca, CA <br /> NGA Project No. 10.90-479 <br /> Page 3 <br /> TABLE I <br /> - Tank informat_on <br /> Size Product Stored Aae Status <br /> - 10,000 gallons Regular gasoline 5 years Removed <br /> 10,000 gallons Unleaded gasoline 5 years Removed <br /> - 10,000 gallons Diesel 5 years Removed <br /> : 10,000 gallons Premium unleaded < 1 year Operating <br /> 10,000 Unleaded gasoline < 1 year Operating <br /> 1 : 8,000 Regular gasoline < 1 year operating <br /> 2.2 summary of Previous Work <br /> Previous work performed at the site includes investigations <br /> performed by Earth Treatment Systeas Environmental (ETS) in August, <br /> 1988, and Delta Environmental Consultants, Inc. (Delta) in May, <br /> 1989. work completed by ETS included the drilling.of two soil <br /> borings, collection of twelve soil samples which were submitted to <br /> a California-certified laboratory for analysis, installation of <br /> ` two ground-water monitoring wells..(MW-l 'and MW-2) , collection and <br /> submittal of 1 ground-water samples to a California-certified <br /> laboratory for analysis, and completion of a report titled <br /> EnvironmentalPrelimi.nary Site Assessment. <br /> j Work completed by Delta at the site in May, 19x9, included the <br /> Q drilling of two soil borings, completion of. two monitoring wells <br /> (MW-3 .and Z4W-4) , collection of soil and ground-water samples for <br /> laboratory analysis, determination of the direction and velocity <br /> of ground-water flow, and the issuance of a report titled <br /> Preliminar H dro eolo is Assessment Report. Recommendations made <br /> by Delta for further investigative work at the site have included <br /> the following: <br /> e Installation of four additional monitoring wells. <br /> C Collection of soil samples during drilling of the additional <br /> monitoring wells, collection of ground-water samples from all <br /> monitoring wells, and submittal of selected soil and all <br /> ground-water samples to a California.-certified laboratory to <br /> - be analyzed for BTEX, EDC, EDB, and TPH. <br /> a Collection of water level data .from all wells and preparation <br /> of a ground water elevation map. <br /> was <br />