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October 28 1967 5 873-1311 <br />Y 1 . l 1 <br />Isolated footings: 24 inches <br />Continuous footings: 18 inches <br />. • . � . �li;�iEi •�Tii�� <br />Passive resistance: 400 pcf, Equivalent fluid <br />Coefficient of Friction: 0.4 <br />I�et : The values for lateral load resistance do not lnclude any <br />factor of safety. The top foot of depth should be neglected in <br />design computatio�s of the passive capaclty unless the soil is <br />confined beneath a pavement or slab. <br />Settlement: <br />Total Settlement: 3/4 inch <br />Differential Settlement: 1/2 inch <br />We recortunend footing drains be included in all the building designs. Footing <br />drains should consist of a four-inch diameter, perforated, rigid plastic pipe <br />embedded in a clean free draining sand and gravel meeting the requirements of <br />the Section 9-03.12 (4) of the 1984 Washington State Standard Specifications <br />for Road, Bridge and Municipal Construction. <br />5.2.2 Driven Timber Piling <br />There are a number of different pile alternati�+es, depending upon required <br />load capacity and project economics. Several nptions include drilled and <br />cast-in-place augercast piles, as well as driven steel ar concrete piles. <br />Augercast piles, concrete piles, and steel piles are typically not economical <br />unless the project designs require a pile section with a relatively high load <br />capacity. In addition, augercast piles are not well suited for installation <br />in very soft Peat deposits were they can either'neck off ar balloon. Based on <br />the anticipated relatively light building loads and the existence of the soft <br />Peat deposits, we have only evaluated conventional driven, treated timber <br />piles. <br />Generally, piles wlth minimum eight-inch diameter tips may be designed for an <br />allowable load of 20 tons and piles with a minimum ten-inch diameter tips may <br />be designed for an allowable load of 30 tons. The recommended allowable loads <br />are designed for end-bearing, include a factor of safety of 3, and are <br />designed to account of downdrag which will occur if add,itional fill is placed <br />across the site. <br />All piles should be driven with an air, steam, or diesel hammer developing a <br />minimum energy of 15,000 footpounds, and pile capacity should be verified <br />using an appropriate dynamic driving formula. Ne do not consider a drop <br />hammer an appropriate mea�vs of driving piles on this site. The piles will <br />Golder Assoclates <br />