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y n F ' eel, I le reyNEv teel Oslo Road Improvement Project Page 2 File No . 11 -5420 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 (SCS) in 1987 , states that the predominant surficial soil types along the project alignment are Boca fine sand and Winder fine sand. In addition , we note that the surrounding site surface along the eastern edge of the project limits is formed by the Riviera fine sand and Wabasso fine sand soil types . These soil types are summarized and presented in Table 1 , and complete descriptions of these soil types , as taken from the Soil Survey, 17 are included in Appendix I . The general project limits are shown on a reproduction of the Soil Survey Map of the general study area (compiled on 1980 aerial photography by the USDA, SCS and cooperating agencies) , included as Figure 2 . leek In general , our soil borings encountered soil conditions similar to those described in the USDA Soil Survey for these soil types. We note that these soil types have an elevated seasonal high groundwater table , within 10 inches of the natural ground surface , for several months out of the year, as well as a perched water table (due to shallow clayey soils) during or immediately following periods of heavy rainfall . 1 . 4 . 2 USGS Quadrangle Map Based on our review of the Oslo , Florida USGS Quadrangle Map , the approximate ground surface elevations along the project alignment range from +20 to +25 feet relative to the 1929 National Geodetic Vertical Datum ( NGVD) . 1 .4 . 3 Potentiometric Surface Mab Based on review of the " Potentiometric Surface of the Upper Floridan Aquifer in the St . Johns River Water Management District and Vicinity, Florida" map (dated May, 2009) published by the United States Geological Survey, the potentiometric elevation of the Upper Floridan Aquifer in the vicinity of the project corridor is approximately +27 feet NGVD. This would indicate that the site is in an area of potential artesian flow considering the ground surface elevations shown on the USGS Quadrangle Map . 2. 0 FIELD EXPLORATION PROGRAM 2 . 1 Auger Borings The field exploration program included performing auger borings at selected locations within the proposed improvement areas. The auger borings were conducted using a 31111inch diameter hand- held (bucket) auger to approximate depths of between 5 and 7 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 ll . I Ile Ile , .— s el Ile le . _ _ _ _ _ �.. ,. . > wx'.r' x . . .. x . . n ,