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tvlarch 7f1. ]994 �2 ���525 <br />Maxlmum Allowable Deuing Pressure <br />Foundation Bearing in: <br />Compacted Structural Fill <br />Weathered Till <br />Fresh Tili <br />Dase Fdctlon <br />Earth Preseuree <br />Restrained Walls <br />Cantilevered Walls <br />Passive <br />3 kps <br />3 kps <br />6 kps <br />0.4 <br />50 pcf <br />30 pcf <br />?50 pcf <br />These values are appropriate for all dead and live loads. A one-third increase is allowable for <br />trensient loadings such as due to wind and seismic. <br />Settlement Es►Imate <br />Total Settlement <br />Differential Settlement <br />4.4.2 Floors <br />Less than ]/2 inch <br />Less than ]/4 inch <br />The compact to dense, native site soils are suitable to support conventional slab on grade <br />floors. All slabs should be underlain by a capillary break which consists of at least four <br />inches of sand dreinage blanket meeting the requirements of section 9-03.13(1) of the 1991 <br />Washington State Standard Specifications for Road, Bridge and Municipal Construction. The <br />sand drainage blanket should be overlain by plastic sheeting which is in tum overlain by at <br />least two inches of drainage sand. <br />9.4.3 Drainage Provisions <br />We recommend that footing drains be included in all building designs where portions of the <br />slab are below grade. Footing drains should consist of a four-inch diameter, perforated, rigid <br />�>lastic pipe embedded in a clean, free draining sand and gravel, meeting the requirements of <br />section 9-03.12(4), of the 1991 Washington State �tandard Specifications for Road, Bridge end <br />Municipal Construction. The footing drains shuuld be conveyed by means uf positive <br />dreinage to the storm sewer system. Roof drains should be carried in an independent drain <br />system from the footing drains. <br />We recommend thar, short and long term drainage provisions be incorporated into the project <br />design and construction. Surface runoff can be controlled during construdion by careful <br />grading practices. Typically, these include the construction of shallow upgrade perimeter <br />ditches or low earthen berms and the use of temporery sumps to collect run-off and prevent <br />water from damaging slopes and Exposed subgredes. All collected water should be directed <br />Golder Assoclates <br />