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Subsurface Exploration and Foundation Evaluation Proposed Golden Oil Refueling Station Stoughton, Wisconsin PSI Project No. 0092822 Page 3 Field Exploration Nine (9) soil test borings were drilled for this project to a depth of about 10 to 17.5 feet below the existing ground surface. The number, depths, and locations of the borings were provided by the client. The borings were located in the field by the drill crew utilizing conventional taping procedures referenced to existing site features and apparent property lines. They are estimated to be accurate to within a few feet. The surface elevations shown on the logs were estimated by interpolation of a 1-foot contour map of the property, provided by Excel Engineering. The elevations are estimated to be accurate to within about 1-foot. The soil test borings were performed with a truck-mounted rotary drilling rig utilizing continuous flight hollow stem augers to advance the holes. Representative samples were obtained by the Standard Penetration Test (SPT) method using split-spoon sampling procedures in general accordance with ASTM D-1586 procedures. Samples were collected at 2'/ foot intervals to 10 feet, and then at 5-foot intervals thereafter to the end of the borings. As an exception, samples were obtained at 2-foot intervals at the borings performed within the proposed pavement and/or stormwater management areas. The standard penetration value (N) is defined as the number of blows of a 140-pound hammer, falling thirty (30) inches, required to advance the split-spoon sampler one (1) foot into the soil. The sampler is lowered to the bottom of the drill hole and the number of blows recorded for each of the three (3) successive increments of six (6) inches penetration. The "N" value is obtained by adding the second and third incremental numbers. The SPT provides a means of estimating the relative density of granular soils and comparative consistency of cohesive soils, thereby providing a method of evaluating the relative strength and compressibility characteristics of the subsoils. The SPT soil samples were transferred into clean glass jars immediately after retrieval, and returned to the laboratory upon completion of the field operations. Samples will be discarded unless other instructions are received. All soil samples were visually classified by a soil engineer in general accordance with the Unified Soil Classification System (ASTM D-2488-75). The samples collected within the stormwater management areas were classified by a certified soil tester in general accordance with USDA National Resources Conservation Service textural soil classification procedures. A description of the subsurface conditions encountered at each boring location is shown on the enclosed Soil Boring Logs. After completion of the borings, the auger holes were backfilled to the ground surface with bentonite chips. A copy of the Soil Boring Logs and Boring Location Diagram (Figure 1) are enclosed in the Appendix. The soil stratification shown on the logs represents the approximate soil conditions in the actual boring locations at the time of the exploration. The terms and symbols used on the logs are described in the General Notes found in the Appendix. Laboratory Physical Testing Soil samples obtained from the exploration were visually classified in the laboratory, and subjected to testing, which included moisture content determination. Selected cohesive soil samples were tested in unconfined compression with a controlled strain loading rate and/or