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F Applied Soil Mechanics, Inc, SOIL AND FOUNDATION ENGINEERS s GEOLOGISTS 835 Blossom Hill Road, Suite 215 • San Jose, California 95123 (4M 365-8100 I � File No. A7-1.909-JI November 3, 1987 Sunboro Development Corporation 1307 South Mary Avenue, .Suite 208 Sunnyvale, CA 94087 Attention : Mr. David Ng Subject: Proposed Residential Development, On 47+ Acres l Northwest Corner of Fabian Road and Corral Hollow Road f� Tracy, California j FEASIBILITY INVESTIGATION U ' Dear Mr. Ng: 1 As you requested, we have completed the f asibility investigation . for the subject project. See Figure 1, Site. Plan, for a graphic representation of the subject site. It is our understanding that the proposed project will consist of the construction of an undetermined numb r of one- and/or two-story, wood- frame residences. Asphalt streets and parking areas are also planned. Introduction The object of this preliminary investigatio was to determine the near surface soil and ground water conditions at the site, address the feasibility of constructing the proposed project, specify restrictions, if any, and provide preliminary recommendations for the grad ng and foundation construction. I However, the scope of this preliminary investigation does not include providing - specific site development rec mmendations including foundation recommendations, such as bearing capaci y or lateral earth pressure quantities. The scope of this investigation included th drilling of three test borings y within the subject site, a limited so 1 laboratory testing program, engineering analysis, and the writing of th s letter. Three preliminary test borings were drilled on the site at the approximate locations shown on Figure 1. The test bori gs were drilled on October 14, i° 1987 under the direction of Mr. Mike Van Horn, the project Geotechnical Engineer for this report. Test borings nos 1 and 3 were drilled to a depth ( of approximately 20 feet below the existing ground surface. Test boring no. 2 l was drilled to a depth of 35 feet, in ordr to assist in evaluating the potential for liquefaction at the site. 'Al test borings were drilled with a truck mounted drill-rig with a six-inch di meter auger. Undisturbed soil samples were obtained by hammering a 'Modified California," three-inch diameter sampler, or a standard "Terzaghi" ampler into the soil mass. The hammering system consisted of a 130 pound hammer with a 30-inch free fall stroke. Two bulk soil samples were also obtained at the locations shown in u Figure 1, Site Plan. L