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Apiv/ied GeoSrstems 43255 Mission Blvd. Suite B Fremont,CA 94539 (415)651-1906 April 20, 1987 0420jmcc 8691-6 Mr. Jim McCutchen Beacon oil Company 525 West Third Street Hanford, California 93230 Subject: Letter report No. 8691-6V regarding Soil Vapor Probe Survey at Beacon Station #1-502, located at 35 North Cherokee Lane, Lodi, California. Dear Mr. McCutchen: The following represents a summary of the results of a soil vapor survey which was performed at the above-referenced site by Western Geo-Engineers (WEGE) . Data from this study were used in selecting the location of monitoring well MW-5 at the site. The purpose of the study was to evaluate the distribution of soil and ground water contamination detected during previous studies. WEGE and Applied GeoSystems personnel were present on February 23 , 1987 and March 18, 1987 to conduct the vapor probe survey. Ground water at the site was encountered at an approximate depth of 40 feet below the ground surface. The vapor probe encountered significant difficulty in penetrating a clayey section in the subsurface between 15 and 25 feet in depth. As a result, only two borings reached a depth sufficient to reach ground water. A total of six borings were sampled during this survey. Holes 1 through 5 were drilled on February 23 and hole number 6 was drilled on March 18 . Holes 1 and 6 were drilled at the northern margin of the site, in an attempt to evaluate the possiblity that hydrocarbons may be migrating onto the site from the service station across Elm street to the north. Holes 2 and 5 were located in order to delineate the extent of contamination at the margin of the site down-gradient from the tank cavity. Holes 3 and 4 were drilled in order to evaluate the possibility of gasoline leakage associated with the product lines and dispensers.