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�� <br /> DAVI� L. NELSON AND ASSOCIATES, INC. <br /> Consulting Enginccring Gcalogy <br /> September 28, 1984 <br /> Project No. 78f�4 <br /> • Page seven <br /> We suggest an additional 2" of asphaltic concrete surfacing be <br /> placed within the normal truck traffic ar��as, such as delivery <br /> routes, ine;ress and egress and loading areas. <br /> During the normally wetter periods of the year, we suggest that � <br /> the strcui;ural fill subbase be increased to 12" across the area, <br /> to aid in stability of the roadbase . The base and surfacing <br /> recommendations should be performed as discussed above . <br /> On-site soi].s could be utilized for subgrade filling and pre- <br /> paration prior to placement of the subbase structural fill and � <br /> � proofrolling if the material utili2ed is inor�;ar.ic and below <br /> optimum moisture . On-site soils used for site grading should <br /> be placed in 6" to 8" maximum lifts and compacted 'to 95/ of II <br /> ASTM D-1557. Should the material become over-ootimum moisture <br /> we suggest that it either be alloweci tn dry out prior to addi-cional � <br /> , placement or removed and replaced with granular structural fill . I, <br /> Additional Notes I <br /> Norrnal total and differential settlements, on the order of 1/2 <br /> to 1 inch is espected within the foundations placed within ttie <br /> medium dense to dense natural soils . Total and differential I <br /> settlements of up to 1.5 inches are expected within building <br /> areas placed upon structural fill . <br /> Site grading should be performed such that standir�g or ponding <br /> water is not allowed to occur around the structure areaso <br /> The on-site soils are water sensitive due to their fine grained <br /> nature . We would suggest .that earthwork be performed only <br /> within times of normally dry weather. In the event that wetter <br /> s�eason development and construction is desired, we would suggest <br /> that all• excavations and structural fill be protected from satur- <br /> ation by the elements. ioosened or saturated soils should be <br /> removed and replaced with granular structural fill prior to I <br /> placement ef roadway bases or footing concrete . <br /> . I <br /> I <br /> I <br />