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Aug 25 04 07:55a Jon Whitcomb <br />RUG 25 '04 02:38PM BRAUN INTERTEC <br />D. Recommendations <br />D -1. Site Grading <br />851- 430 -0029 <br />Wesley Investments, Inc. <br />Project SP-04-03734 <br />May 21, 2004 <br />Page 5 <br />p. 10 <br />P.10/23 <br />0.1.a. Excavations. We recommend removing topsoil, swamp deposits and very loose or organic - <br />containing lake deposits frorn beneath the proposed'ouilding and pavement areas. <br />Table 1 below, shows the anticipated excavation depths, and corresponding bottom elevations, <br />anticipated at each boring location. <br />Table 1. Summary of Excavation Depths and Bottom Elevations <br />Boring <br />Surface <br />Elevation <br />Anticipated <br />Excavation Depth <br />Materials Excavated <br />Approximate <br />Bottom Elevation" <br />ST -1 <br />861.4 <br />9 feet <br />Topsoil, swamp and lake deposits <br />852 <br />ST -2 <br />873.5 <br />7 feet <br />Topsoil and swamp deposits. <br />866 <br />ST -3 <br />877.1 <br />1 foot <br />Topsail <br />S76 <br />ST-4 <br />864.4 <br />9 feet <br />Topsoil, swamp and lake deposits. <br />855 <br />A - Approximate bottom elevations rounded to lowest foot. <br />Where excavations extend below proposed footings, we recommmend that they be oversized to <br />provide lateral stability for the backfill. The borroms of the subexcavations should be oversized <br />1 foot beyobd the edges of the footings for each foot subexcavation below the bottoms of the <br />footing (1:1 oversizing). Loosened soil in the bottoms of the excavation should be compacted <br />prior to bacldilling. <br />Dewatering. Excavations to remove swamp and lake deposits in the lower elevated <br />portions of the site will likely encounter groundwater. We recommend that provisions be made <br />for dewareriog the excavations. <br />D.1.c. Selection, placement and Compaction of Backfill and Fill. We.recotnmend that <br />topsoil and swamp deposits be placed in landscaped areas or exported from the site. Portions of <br />the lake - deposited sands that contain less than 3 percent organic material by weight may, in our <br />opinion, be reused as backfill and fill. These sands, however, will likely be wet and require • <br />drying if they are to be reused as structural backfrll and fill. The clayey glacial soils may be <br />reused as structural backfill and fill. We recommend that clayey soils be placed vrith a moisture <br />content within 1 percentage point below to within 3 percentage points above their optimum <br />moisture content, <br />