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40 <br />0 <br />� <br />�Round Island Oceanside Park Improvements S -R. A -1-A December 3. 1997 <br />�� -----___—__— ' <br />� ATTACHMENT <br />Goneral Site Preparation <br />The foundation and pavement areas should be cleared of all trees, roots, Surface vegetation, and any <br />other deleterious matter to 5 feet outside of the proposed structure and pavement areas. After clearing, <br />.J <br />the area is to be graded and then compacted with o self-propelled steel drum vibratory no|kar having <br />� o minimum total applied force of 10 tons. SuMicient uumpan(we eUorl should be applied to obtain o <br />minimum of 9b%n/the maximum d/ydenuhy fora depth of feet aodetermined byAASHTO T'180 <br />(ASTM D'1557). The vibratory compactor should make a minimum of 12 overlapping passes, 6 in one <br />` <br />direction, and 6 in a direction at right mnQ|eo over the onhno cleared area. If any unstable soil <br />conditions orsoft areas are encountered during the preparation ofthe houndahon' thepnm��enginew[ <br />i <br />geotechnical consultant nrother responsible professional should be 1nhnmmd' the matter investigated <br />nm <br />and the problem resolved. Any subsequent excavation and backfilling should be in accordance with <br />the n/dur|aaaou()inedbelow. <br />w� <br />Where fill is to be placed on natural ground, the surface must first be prepared as outlined above. The <br />Y� <br />fill at grade should extend m minimum of G feet beyond the structure outline. <br />�T <br />Fill should be a uniform hom draining granular soil (clean sand) and be placed in layers not to exceed <br />l� 12 inches loose measure and compacted aooutlined above. Sufficient uompuctivoeffort should be <br />applied toobtain a min|mumofQ596ofthe maximum dry density mndetermined byAASHTOT'18O <br />Excavation and BackfillIng <br />Where excavation and backfilling are required, the soils should be removed to the specified depth. <br />Sufficient coin poc{iveeffort mmst then beapplied Vothe oxoavmtedmodenetoobtain amin|mumnfD5Y6 <br />of the maximum dry density as determined by AA8HTO l-180 (ASTM C-1557) <br />8aoWU| should boa uniform free draining granular soil (clean sand) and baplaced in layers not to <br />exceed 18inches loose measure. Sufficient uompuotivoeffort should boapplied toeach layer toobtain <br />m rninimum of 0596 of the maximum dry density for the entire depth of the UU as detomlinad by <br />AASHTO T'18O (ASTM O'1557). The excavated surface and each layer of backfill shoukj be <br />compacted with aself-propelled steel drum vibratory roller having ominimomtotal applied force of 10 <br />Ione. <br />Footing Excavation <br />After the footings have been excavated representative density tests should be taken. The density at <br />�[ <br />the footing grade should be a minimum of 95% of the maximum dry density as determined by AASHTO <br />T'180 (ASTM O'1557). If the bottom otthe footing has been loosened during oxcavu1ion, or if the <br />bottom of the looting is below 1 foot from natural ground, the footing area should be compacted with <br />~ heavy plate vibratory compactor. Sufficient oompatdve effort should bo applied to achieve the <br />required density. <br />4 <br />