4815 EVERGREEN WAY 2016-01-01 MF Import

JP Morgan Chase April 29, 2010 Geofechnical Investiga tion Proposed Chase Bank Evereft, WA PSI Report No. 0704186 TABLE 2: LATERAL RESISTANCE FACTORS Soil Type ��owable Frlction CcefFlcient On-Site SILTY SAND 0.40 Granular FILL 0.45 4.8 SLAB-UN-GRADE FLOORS Satisfactory subgrade sup�ort for lightly loddetl building floor slabs can be obtained on the undisturbed native sandy gravel, or on engineered structural fili. An 8-inch-thick layer of imported granular material should be placed and compacted over the prepared subgrade to assist as a caoillary break. A subgrade modulus of 150 pounds per cubic inch may be used to design the floor slab. Imported granular material should be crushed rock or crushed gravel and sand that is fairly well- graded between coarse and fine, contain no deleYerious materials, have a maximum particle size of 1%z inches, and have less than 5 percent by weight passing the U.S. Standard No. 200 Sieve. The imported granular marerial should be placed in one lift ana compacted to not less than 95 percent of the maximum dry density as determined by ASTM D69�. Bank vault floor slabs should extend monolilhically beyond any vault doors. Vapor retarding membranes are often required by ilooring manufacturers to protect flooring and flooring adhesives. Many flooring manufacturers will warrant their product only if a vapor retarding membrane is inslalled acc ording to thP'� �ecommendations. However, vapor retarding membranes can trap and hold excess moisture when installed in rainy weather. Selection and design of an appropriate vapor barrier, if needed, should be based on discussions among members of the design ieam. We can provide additional information to assist you with your decision. 4.9 DRAINAGE We recommend footing drains be placed around the exterior of the building foundation to reduce the potential for lateral migration ef moisture into the building envelope. We recommend thai roof drains be connected to a tightline leading to storm drain facilities. Pavement surfaces an+ open space areas should be sloped such that surface water runoff is collected and routec' to suitable discharge points. We also recommend that ground surfaces adjacent to buiidings be sloped to facilitate positive drainage away from !he buildings. N=�1 7