1230 MADRONA AVE 2016-01-01 MF Import

April ] 0, 2005 Proposed Single-Pamily Residence L&A Job No. SA019 Page 10 � Our reconunended desig�� soil pressure diagram for cantilever soldier pile shoring walls is shown on Platc 5. The shoring �valls should be designed for an active soil pressure of 35 pcf (pounds per cubic foot) cquivalent tluid density (CPD). One l�alf of the height of the sloped cut aUove the top of the shoriug walls shotdd be consider as surchargc load in calcidating the aclive soil pressure on the walls. Thc active soil pressure should act on one pile-spacing above bottom of exc�vation, and onc pile-diameter belo�v. 1'he toc embedmeut of Ihc soldier piles will most Iikeiy bc cnlirely in the densc, ad��ancc outwash soils. To cotmtcr the active soil pressurc, a passive soil pressure of 450 pcf rI'D over soidicr pilc toc cmUedment may bc used. '1'lie p�ssive soil pressure should �ct on onc pilc spacing or h��o pilc-diametcrs, whichcvcr is lcss. 7'hc abovc soil pressures are imfactorcd ultimatc vulucs, and a factor of safety of 1.5 againsl sliding and overtur��ing failures should l� : used lor the design of thc temporary shoring walls. '1'hc timbcr lagging banrds should bc shimmed to lc.rvc � I/4-inch ��crtical gap bchvccn thc bo:�rds lo allow groundwatcr to scc�i through. A vcrlica) dr<iin mat, suci� as Miradrain GOOQ shoidcl be placed aga�inst Uic building-side face of the lagging boards prior to poin•ing basement �vnlls against U�e shoring ��aIL A SU�CII':11I7 linc placed at the base of lhe bascment �valls per recom�nendulions in �his report sliould bc hydratdic.dly conueeted to ihe vertical drain ma�. S'CRUC7'L112AL 1� II,L Structw•al fill is thc fill that supports sir�ictw�al or traffic foad. Structural fill shoidd consist of clean soils free of orguuic and otl��r clelcterious suUstnnces and with particles not larger than four inches. Structural fill shoulcl h�ve a moisturc content �vithin one percent of its optimum moiswre content at the time of placcment. 7�he optimum moistiue content is the water content in the soil Uiat enablc the soil to Uc compacted to lhc ]iighesl dn� density for a given compaction effort. LIU �C ASSOCIAT�S, INC.