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Aug 26 04 07 :55a Jan Whitcomb <br />651- 430 -0029 p.11 <br />AUG 25 '04 02:38PM BRAUN INTERTEC P.11/23 <br />Wesley Investments, Inc. <br />Project: SP- 04.03734 <br />May 21, 2004 <br />Page 6 <br />If fill soils are placed below water or on wet excavation bottoms, we recommend coarse sand or <br />gavel with less than 5 percent particles by weight passing a 200 sieve and ICS's than 50 percent <br />passing a 40 sieve. <br />We recommend backfill and fill be placed in lifts not exceeding 8 to 10 inches and compacted in <br />accordance with Table 2. <br />Table 2. Compaction Recommendations <br />Fill/Backilll Location <br />Min tmum R ecnmmended <br />Compaction (Std. Proctor) <br />Building Pad with less than 10 feet of fill <br />95% <br />Building Pad with 10 or more feet of fill <br />98 o <br />Roadway Area - more than 3 feet below pavement subgnde elevation <br />95 % <br />Roadway Arca - within 3 feet of pavement subgade elevation <br />100 `/o <br />Additionally, where fill heights exceed 10 feet in building pad areas, we recommend tither using <br />clean sand as backfiill and fill, or delaying building construction for at least 3 months if clayey <br />soils are used as backfilJ and ill. <br />D.2. Footings <br />D.2.a. Depth. We recommend that the perimeter footings bear a minimum of 3 1/2 feet below <br />exterior grade for frost protection. Interior footings may be placed immediately beneath the slab. <br />Exterior footings and unheated footings, such as those for stoops, should be extended at least 5 <br />feet below exterior grade. <br />D.2.b. Allowable Bearing Pressure. In our opinion, footings placed on competent glacial soils <br />or adequately compacted' fill and baclthil can be sized to exert a net allowable soil bearing pressure <br />of 2,500 pounds per square foot (psf). We recommend that strip footings have a minimum width of <br />18 inches and column pads have a minimum size of 2 1/2 by 2 1/2 feet. <br />D.2.c. Settlement. We anticipate that total and differential settlement of footings will be less than <br />1 and 1/2 inch, respectively, underthe assumed loads. Residential units can generally tolerate <br />settlements of these amounts. <br />