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WNEE a rIANIFN�� I August 15, 1990 Mr. Joseph Mell 333 West Santa Clara Street: San Jose, CA 95126 PRELIMINARY SUBSURFACE ASSESSMENT 2360 East Road Grantline and East Roads Tracey, CA 95376 ' Deaf r-.--mel-j-, On July 26, 1990 \ ENVIRONMENTAL CONSTRUCTION COMPANY (TECO) C d a nary subsurface contamination assessment of the property located at Grantline and East roads in Tracey, California. The purpose of this phase of work was to investigate the extent of possible hydrocarbon contamination in the soils and groundwater near the underground storage tanks (UST's) on the site. The scope of work included 1. the drilling of 6 soil borings; 2. The collection of soil samplesfrom the vadose zone (the zone of saturated soils directly above the water table) ; 3. Providing for analytical laboratory results of the sampling; 4. This report of findings, conclusions, and recommendations. LOCATION AND DESCRIPTION OF SITE The site is a retail gasoline service station located in a commercialized and residential area in the east central portion of the town of Tracy, California. The property is located on the northeast corner of the intersection of Grantline and East Roads. It is paved with asphalt, except where the tanks are located; they are covered with concrete. The site contains a small maintenance garage, two product dispenser areas (pump islands), three steel underground storage tanks (UST's), and one steel waste oil UST. These tanks are located on the eastern side of the property. Adjacent properties include the Tracy Bowl and Restaurant to across East Road to the west, Snow White Drive-In (an inactive fast food restaurant) to the north, Tracy Shopping Center to east and parking areas for the shopping center to the south. Steve's Bait Shop, a video store/U-Haul business lies to the northwest of the site, immediately across the intersection of Grantline and East roads. The water supply in the area is from the city of Tracy. The closest body of surface water, the San Joaquin River, is located `- approximately 3 miles to the east. The site is underlain by medium ----------__-- -------.___---to dark.--brown,._-st.iff,-dry-cla — ------- -- y-fol-lowed--by--slight-ly-less--than--- feet of damp, plastic, gray to olive-brown clay. Groundwater is present in a sandier silty clay at approximately 8 feet below grade. Based on the surface topography a very low groundwater gradient is assumed. It is estimated that the direction of