1110 RAINIER AVE A DOMESTIC VIOLENCE SERVICES OF SNO CO 2018-01-01 MF Import

� Evare(f Housing Authoriry P�iay i6. 2012 � �r� izoeo Page G the top of the pile during driving. If the piles are instailed by alternative melhods, such as a vibratory hammer or a hammer that is hard-mounted to the installation machine, numerous load tesls to 200 percent of the design capacity would be necessary to substantiate the allo�vable pile load. The appropriate number of load tesis wouid need to be determined at the time the contractor and installation method are chosen. Although it is difficult to determine lhe final depths of the piles, we 2nticipate approximateiy 10 (eel of pile embedment into ihe compelent native soils lo achieve the noted capacities. As a minimum, Schedule 40 pipe should be used. Due to the existence of peat soils, which can corrode metai, we recommend the piles be galvanized. Pile caps and grade beams should be used to transmit loads to the piles. Isolated pile caps should include a minimum of two piles to reduce the potential for eccentric loads being applied fo the piles. Subsequert sections of pipe can be connected with slip or threaded couplers, or they can be welded together. If slip couplers are used, they should fit snugly into the pipe sections. This may require that shims be used or that beads of welding ti�x be applied to the outside o( the coupler. Lateral :oads due to wind or seismic forces may be resisted by passive earth pressure acting on the verlical, embedded portions of the foundation. For this condition, the foundation must be either pourea dlrectly against relatively level, urdislurbed soil or be surrounded by level compacled fill. �Ne recommend using a passive earlh pressure of 300 pounds per cubic foot (pcf) for lhis resistance. If the ground in front of a foundation is loose or sloping, the passive eaRh pressure given above will not be appropriate. �Ve recommend a satety factor of at Ieast 1.5 for the (oundation's resistance !o lateral loading, when using the above ultimate passive value. Due to their smail diameter, the later2l capacity of vertical pipe piles is reiatively small. However, if laleral resistance in addilion to passive soil resistance is required, we recommend driving battered piles in lhe same direction as the applied laterel load. The lateral capac�ty of a baltered pile is equal to one-half of ihe lateral component of the allo�vable compressive load. The allo�.vable vertical capacity oF battered piles does not need to be reduced if the piles are battered steeper than 1:5 (Horizontal:Vertical). PERMANENT FOUNDATION AND RETAIN/NG WALLS Retaining walls backfilled on only one side should be designed to resist ihe lateral earth pressures imposed by ihe soil ihey retain. The following recommended parameters are for walls lhat resirain level back(ill: Activc Earth P�� c.:ure ' � 35 pd Passive [a�th Pressure � 300 pcf Whoro: (I) pcf Is pounds por cub�c lool, and (il) aclive an� passive earth pressures are camputed using tho equivalenl IIuiU pressuros. • For a restrained v�all that cannot dellect at Ieast 0.002 times Its helght, a unlfarm latoral pressurc equal to �0 psl tlmos the hal9ht al tho wall should be addod lo lha �6ovo ac!ive equlvalont fluid prossure. GEOTECH COYSULT�NTS,INC.