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( <br />DWRCONSULTANTS, Inc., Geotechnicallnvesfigafion <br />Proposed Sa/eway Gasoline Sfation, June 8, 2000 <br />4.4 Geohydrology <br />This soil percolates rapidly with a rate of at leasl 8 tt. per hour. <br />5.0 ANALYSIS <br />This section uses the data presented in the previous section, 4.0 Investigation, to <br />suppoi our con�lusions and recommendations. The method used for our analysis are <br />presented along with the data source. The Sub-sections necassarily address specific <br />tasks necessary to design and construct the project. <br />5.1 Site Grading <br />Site grading should pose no problems considering the flat topography, large area <br />of grass, and lack of trees within the silt layer. <br />5.2 Foundations <br />We pertormed the following analysis for allowable bearing pressure vs. tooting <br />depih for settlement of less than 5/8 inch. The following analysis, and assumptions, <br />provide these results: <br />The values below assume no significant disturbance of the soil sub-grade, below <br />the footings, during excavation. This is difficult to achieve considering the coarse <br />gravel, cobble, and boulders. <br />Since the sub-rounded soil parlicles derive their strength irom con(inement, the <br />depth of burial is a crur,ial component of ihis recommendation. The following <br />table serves to highlight this issue: <br />Assumed <br />frictlon angle <br />(compact) 36 <br />(very loose) 30 <br />2 ft. burial <br />(psf) <br />6194 <br />2655 <br />cit vs. ue tn c <br />1 ft. burial <br />(psf) <br />4117 <br />1690 <br />Page 5 of 11 <br />Footing Burial <br />0.5 ft. burial <br />(psf) <br />3078 <br />1207 <br />Surfece footing <br />(psf) <br />2040 <br />724 <br />