2008-342C - Laserfiche WebLink

Home Browse Search

Indian River County File No . 06 - 5699 -2- 1 . 4 Review of Available Data 1 . 4 . 1 Soil Survey Map 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 .