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Indian River County File No. 0&5699 1.4 Review of Available Data 1.4.1 Soil Survey Map -2- The Soil Survey.of Indian River County, Florida, which was issued by the U.S. Department of Agriculture, Soil Conservation Service in 1987, states that the predominant surficial soil type in the area where the project alignment is located is EauGallie fine sand. The EauGallie fine sand soil type consists of deep, nearly level and poorly drained soil found on broad flatwoods. Slopes are smooth and range from 0 to 2 percent. Typically, the surface layer is black grading to dark gray fine sand about 15 inches thick. The subsurface layer. is gray fine sand to a depth of about 26 inches. The subsoil extends to a depth of 62 inches. The upper 21 inches of the subsoil is black, very dark gray, dark reddish brown, dark brown, brown fine sand. The lower 15 inches is grayish brown or gray sandy loam. The substratum is light brownish gray loamy fine sand to a depth of about 80 inches. In most years, the water table is within a depth of less than 10 inches of the surface for 2 to 4 months during the wet season and within a depth of 40 inches for more than 6 months. Permeability is rapid in the surface and subsurface layers and moderate to moderately rapid in the subsoil and substratum. The approximate project alignment is shown superimposed on a reproduction of the Soil Survey map presented as Figure 2. 1.4.2 USGS Quadrangle Map Based on review of the 1949 Oslo; Florida USGS Quadrangle map, the approximate ground surface elevations along the project alignment is at approximately +23 feet relative to the 1929 National Geodetic Vertical Datum (NGVD). 2.0 FIELD EXPLORATION PROGRAM 2.1 Auger Borings As requested, thefield exploration program included performing auger borings at selected locations within the proposed improvement areas at approximate 150400t intervals, alternating sides of the proposed new centerline, where possible. The auger borings were conducted using a 3 -inch diameter, hand-held bucket auger and were advanced to an approximate depth of 6 feet below the existing ground surface. The borings were backfilled with accumulated soil cuttings upon completion of the field exploration program. A summary of the auger boring procedure is included in'Appendix I.