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IAulik Associates <br /> Project BL-04-06716 <br /> ( October 11, 2004 <br /> Page 5 <br /> � <br /> � Table 1. Anticipated Eacavation Depths <br /> Appro�mate Anticipated Anticipated <br /> � Boring Surface Ezcavation Depth Egcavation Elevation <br /> Number Elevation feet feet <br /> ST-1 930.4 4 1/2 925 1/2 <br /> � ST-2 930.4 4 926 <br /> ST-3 931.3 4 927 <br /> ! If excavations extend below the bottom of footing grade,the bottoms of excavations should be oversized <br /> � 1 foot horizontal for every vertical foot of excavation below the proposed footings. The oversizing is to <br /> provide lateral support to the engineered fill. <br /> I <br /> Prior to placing fill or footings, we recommend where possible the excavation bottom be <br /> I surface-compacted with a large compactor. Due to the groundwater levels at the time of excavation this <br /> may not be possible in all azeas. The compactor should be able to operate on both static and vibratory <br /> mode. Rolling in static mode will help to prevent the pumping of groundwater into the upper levels of <br /> Ithe subgrade. The surface compaction will aid in densifying soils disturbed during stripping of <br /> vegetation,topsoil,previously-placed fill, swamp deposited soils and previously-placed underground <br /> ( utilities. The surface compaction will provide a more uniform subgrade for fill, carriage home and floor <br /> slab support. <br /> ( The fill required to attain the proposed grades may consist of any debris-free, non-organic granular <br /> mineral soil. The exception being within 3 feet of the groundwater ta.ble where granular soils ranging <br /> I from poorly graded sand to poorly graded sand with silt with less than 7 percent passing the number <br /> ( 200 sieve and at least 50 percent reta.ined on the number 40 sieve should be used. Some of the native <br /> � granular soils classified as poorly graded sand with silt may be mined from other areas of the site and <br /> reused as engineered fill near the groundwater table.The remainder of the fill may consist of the natural <br /> granular soils or select portions of the granular previously-placed fill.We estimate approximately • <br /> � 25 percent of the previously-placed fill soils will be reusable. The fill reuse would.require the removal <br /> of topsoil, organics, debris and foreign materials. Dewatering with well points may be necessary in <br /> � limited areas of the soil correction. <br /> We recommend each lift be compacted to a minunum of 97 percent of its maximum dry density as <br /> � determined by the standard Proctor. For fill placed above bottom of footings and under the floor slab, <br /> 95 percent compaction is recornmended. Fill should be placed within 3 percent of optimum moisture <br /> ( content. All fill should be placed in thin lifts and compacted with a large self-propelled compactor <br /> ( <br />