1303 MADRONA AVE 2016-01-01 MF Import

Geotcchnicnl Enginecring Evnluntion 1:,03 Mndronn Ave - King Decembcr 2, 2006 R�II Pile I�'o. 39?OG Page 9 against the front of lhe footing. �Vc recommend th�t tLe uppu foot uf'soil be neglected when cniculating thc passive resistanca The soil surfacc should bc horizomal in front of the tboting f'or a distance equal to nt Icust threc times the depth o1 embcdment of the f�oting. Sl��bs-On-Grade ��Inh_on-grade areas sliould be prepared as rccommcnded in the Site Preparation And Grading sub3ection of lhis report. Alicr removal of loose soil, Oie subgrade should be compncted to a dense, non- yielding condition. Prior to structural fill placcmcnt, thc subgrnde should be proofrolled with u henvy, rubber-ti•ed piecc of eyuipment, �o idcntify soR or yielding urcus that requiro rcpair. Arcas obscrvcd to pump or weave shouid bc reworkcd to strucuinl fill specifications cr be eacavated nnd replaced with properly compactcd structural fill. �Ve recommend that nll (loor slabs be underinin by ut least G inches of free-dr.+ining sand or gravel 1'or u;e as a capillary brenk. A suitable vapor barcicr, such ns hcavy pinstic shceting (10-mil minimum is rocommendcd), should be pinced over tlie sand or gravel. A 4-inch-thick c�vshcd rock blanket may be ❑sed lo cover lhe vnpor bnrricr to profect it. 9'he capillary break should be designed to drain in[o [hc Coundation drain systcm, Lxtcr:il Pressures on Subsurfacc and Rctaining �Valls 7'hc lateral pressure acting on suhswfacc and retnining wnlls is dcpcndcnt on the nnuirc and dcnsity ot the soil bchind the wnll, thc nmotmt of lateral wall movement which cnn occur as blchtill is pinccd, wnll drainage conditions, nnd the inclination of tl�e backfill. Por walls that are free to yicld nt the top nt leust onc thous:indth of the height of the wall (active condition), snil pressures will be Icss than if movemeot is limitcd by such Cactors as wall stiffness or bracing (nt-rest condition). We recommend that wnlls supporting hori�.ontal bnckfill nnd no! _�.ibjected to hydrostatic forccs be dcsigned using a triangular earth pressure dislribution cquivnlent to that excrted by a fluid with a dcnsity of 35 pcf for yiclding (active condition) walls, and 60 pcf for non-yiclding (nt-rest condition) walls. l�hcsc recommcnded lateial earth pressures nre based on the assumption of a horizontal ground surfncc adjvicent to the wall for a distancc of at lenst the subsurface height of Uie wnll, and do not nccount for surcharges. Additional Intcral carth pressures should be considered for surcharge londs ncting ad,jacent to RM! ASSOCIATES LLC li'd GST9-6z9 (03E] s�oaliyo�d �N su�csaQ dLS�EO LD 60 JeW