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G�O✓ystem k19E-E Power Inn Read, Sacrimerito,CA 95826 J9161 45 2-2901 <br /> o FREMONT •COSTA MESA • SACRAMENTO • HOUSTON <br /> January 3, 1989 <br /> AGS 38053-1 <br /> Mr. Gary Brophy <br /> 1235 Slayton Drive <br /> Manteca, California 95336 <br /> Subject: Executive Summary of Preliminary Report No. 38053--1, <br /> Evaluation of Soil and Ground-Water Conditions at the <br /> Former Texaco Service Station at 941 East Yosemite <br /> Avenue, Manteca, California. <br /> 00 Mr. Brophy: <br /> The accompanying preliminary report presents the results of our <br /> evaluation of soil and ground-water conditions at the former <br /> Texaco service station at 941 East Yosemite Avenue in Manteca, <br /> California. The purpose of this investigation was to evaluate <br /> further the extent of soil and ground-water contamination <br /> detected during removal of four underground gasoline storage <br /> tanks from the site. The investigation included drilling three <br /> soil borings, installing three ground-water monitoring wells, and <br /> chemically analyzing selected soil and ground--water samples. <br /> Q on February 11, 1988, Jim Thorpe oil, Inc. removed four <br /> underground gasoline storage tanks and one waste-oil tank. <br /> Canonie Environmental Services Corporation was onsite to collect <br /> soil samples from beneath the tanks. According to Canonie <br /> Environmental Services' Laboratory Report No. 85-052-3580, soil <br /> samples were collected from approximate depths of 11 feet below <br /> -:� grade beneath the gasoline tanks and 7 feet below grade beneath <br /> the waste--oil tank. Results of laboratory analyses performed by <br /> Canonie Environmental Services indicated contamination in the <br /> soil beneath the gasoline tanks at concentrations of total <br /> petroleum hydrocarbons (TPH) ranging from 5.1 to 10o parts per <br /> million (ppm) . In an effort to remove the contamination, the <br /> tank cavity was excavated further, and Canonie Environmental <br /> Services collected a soil sample from approximately 18 feet below <br /> grade. Results o>_ laboratory analyses of this soil sample <br /> presented in Canonie Laboratory Report No. 85-052-3776 revealed <br /> total volatile hydrocarbons at a concentration of 580 ppm and <br /> total lead at a concentration of 29.5 ppm. <br /> t1d <br /> - -. -- --- ---on-October-24,--and_25,-19-88_,--ageologist from Applied GeoSystems <br /> was present at the site to observe drilling and monitoring-well---- <br /> ear <br />