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13th Street SW Bridge at 58th Avenue -3- File No. 07-5535 The groundwater level at each of the boring locations was measured upon completion of drilling. The borings were then backfilled with soil cuttings. The approximate locations of the SPT borings are schematically illustrated on a reproduction of the 2006 aerial photograph (presented as the Boring Location Plan Figure 3) which was obtained on-line from the Indian River County Property Appraiser's website. These locations were determined in the field by estimating distances from existing site features and other points of reference, and should be considered accurate only to the degree implied by the method of measurement used. If more accurate boring locations are required, we recommend that you retain the services of a licensed surveyor. LABORATORY PROGRAM Our drillers observed the soil recovered from the SPT sampler, placed the recovered soil samples in moisture -proof containers, and maintained a log for each boring. The field soil boring Togs and recovered soil samples were transported to our Port St. Lucie soils laboratory from the project site. Each soil sample was then observed by a geotechnical engineer to determine its engineering classification. The visual classification of the samples was performed in accordance with the Unified Soil Classification System, USCS (ASTM 0-2488). The soil classifications and other pertinent data obtained from our explorations and laboratory observations and tests are reported on the soil boring profiles included in Appendix II. In addition, we conducted sieve analyses, percent fines content, natural moisture content and organic content tests on selected soil samples obtained from the borings. The results of the percent fines, organic content and natural moisture content tests are shown on the soil boring profiles in Appendix 0 adjacent to the depth from which the tested samples were taken. The results of the sieve analyses are presented in Appendix III. GENERAL SUBSURFACE CONDITIONS General Soil Profile The results of the field exploration and laboratory programs are graphically summarized on the soil boring profiles presented in Appendix II. The stratification of the boring profiles represents our interpretation of the field boring logs and the results of laboratory examinations of the recovered samples. The stratification lines represent the approximate boundary between soil types. The actual transitions may be more gradual than implied. The .SPT borings typically encountered light to dark brown slightly clayey fine sand (Unified Soil Classification SP -SC) and clayey fine sand (SC) in the upper 4 feet of each boring. Below this, the soils explored consisted of very loose, light gray to very dark brown, slightly silty fine sand (SP -SM), slightly clayey fine sand (SP -SC), clayey fine sand (SC) and silty fine sand (SM) with varying amounts of shell fragments to approximate depths of between 28 to 33 feet. These soils were underlain by medium dense to dense, Tight to dark gray fine sand (SP) and slightly silty fine sand (SP -SM) with varying amounts of shell fragments to the boring termination depth of 60 feet. The above soil profile is outlined in general terms only. Please refer to Appendix II for soil profile details.