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Y <br /> i <br /> I <br /> • Applied GeoSystems 4191-E Power Inn Road, Sacramento, CA 95826 (916) 452-2901 <br /> • FREMONT • COSTA MESA • SACRAMENTO • HOUSTON <br /> August 5, 1988 <br /> 0805MMAR <br /> AGS Job No. 38033-1 <br /> Mr. Melvin Marlowe <br />` Marlowe Properties <br /> Post Office Box 211 <br /> San Rafael, California 94915 <br /> Subject: Executive Summary of Preliminary Report, Evaluation of <br /> Soil and Ground-Water Contamination at Marlowe <br /> r Properties, 4648 East Waterloo Road, Stockton, <br /> California <br /> Mr. Marlowe: <br /> This report presents the results of our subsurface investigation <br /> at the above-referenced site. The purpose of the investigation <br /> was to obtain a preliminary definition of the vertical and <br /> horizontal extent of soil and ground--water contamination. The <br /> investigation included drilling two soil borings, installing one <br /> monitoring well, and chemically analyzing selected soil samples <br /> and one ground-water sample. <br /> On July 7, 1988 , a geologist from our office was present at the <br /> site to observe drilling of two soil borings and installation of <br /> one monitoring well, collect soil samples, and sub3ecti.vely <br /> evaluate soil contamination. Sub)ective evidence of soil <br /> contamination was present in boring B-2 from approximately 30 <br />` feet below grade to the ground water surface (64 feet) . The <br /> results of laboratory analyses of soil samples, however, indicate <br /> that hydrocarbon contamination ranged from below laboratory <br /> detection limits to 3 .4 parts per million. On July 15, 1988 , a <br /> geologist from our office was present at the site to develop, <br /> purge, and sample monitoring well MW-1. Laboratory analyses of <br /> the ground-water sample revealed contaminant concentrations in <br /> I excess of the maximum levels recommended for drinking water by <br /> the California Department of Health Services. <br /> Applied GeoSystems recommends that further subsurface work be <br /> conducted at the project site. Two additional ground-water <br /> monitoring wells should be installed in the inferred downgradient <br /> and lateral directions of ground-water flow to delineate the <br /> extent of ground-water contamination. one monitoring well should <br />