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Site Characterization Report: 7500 West Eleventh Street, Tracy, CA. Page 6 3.0 SITE CHARACTERIZATION PROGRAM As requested by the SJCPHS, SJC prepared a Work Plan for site characterization and remediation of excavated soil at the 7500 West Eleventh Street property. The Work Plan was submitted to that agency on June 2, 1999. (The San Joaquin Company Inc. 1999.) As previously noted, it was anticipated at that time that the stockpiles of affected soil on the property would be remediated on-site. However, that part of the Work Plan was not implemented because the SJCPHS directed that the material be disposed off-site at a permitted facility. 1 The Work Plan provided for a flexible subsurface investigation based on the observational method developed by geotechnical engineers for similar investigations (Peck 1969), which has more recently been advocated by the U.S.EPA (U.S.EPA 1997). It anticipated the drilling of some 20 small-diameter borings by the push-probe technique to delineate the outer boundaries of any plumes of hydrocarbons emanating from the. former sites of the underground storage tanks and dispenser islands. The information obtained from those probes was then to be used to set the locations of approximately eight groundwater-quality monitoring wells. i 3.1 Search for Existing Drinking-water and Agricultural Wells Preparation of the site characterization work plan included a preliminary search for the presence of existing on- and off-site agricultural, industrial, domestic and other wells within a 2,000-ft. radius of 7500 West Eleventh Street. The preliminary well search was made using United States Geological Survey (USGS) topographical maps and the searchable electronic databases available from Vista Information Solutions, Inc. (Vista) of San Diego, California. } No wells within a radius of 2,000 ft. of the subject property are shown on the USGS 7.5' series maps of the Union Island and Tracy Quadrangles. The Vista searchable electronic j database contains information from 25 Federal and State regulatory agency databases, as well as the Federal Reporting Data System (FRDS). Of the two listed wells identified by the Vista search, one is a water-supply well at the property at 7933 West Eleventh Street that was formerly the location of Anna Maria's Italian Restaurant. That property, now known as Jack's Place, is located approximately 1,200 ft. west of the subject property, on the south side of West Eleventh Street. The second well found by the database search within a radius of 2,000 ft. of the subject property is on the property of the Brown House !. Trailertel mobile home park that is located approximately 1200 ft. south of the subject property, on the west side of Chrisman Road. (See Figure 2 for location.) As was expected based on SJC's experience working on projects in the Tracy area, the map and database searches for wells in the neighborhood of the subject property produced fewer citations to existing wells in the area than might be reasonably assumed to be present, based on the use of groundwater as a source of domestic and agricultural supply in the region. SJC