1230 MADRONA AVE 2016-01-01 MF Import

. April ]0, 2005 Proposed Single-�amily Residence L&A Job No. SA019 Page 9 to bc placed on slopes stceper than 15 percent grade should bc retained structurally. Sloping ground excceding 15 percent grade over which fill is to be placed should be benched wiUi vcrtica] steps no more thmi 4 feet high afier stripping of unsuitable surScial soils. Upon completion, the sloping face of permnnent fill embankments should be thoroughly compacted to a naryielding st�te with a hoe-pach. Also, permanent cut or (ill slopcs should bc no stccper than 311:1 V�vithin 15 (eet of the building footprinL 7�he abo��e recommended cut and fill slopes are under the assumption thal groundwatcr scepage will not be encountered during conslruclion. If encotmtered, the construction �vork should be immcdiatcly halted and ihc slopc stability ro-evaluated. Thc slopes may havc to bc flatlened and other measures laken to stabili•r.c the slopes. Stonn runoff should uot he allowed to flow uncontrolled over the top of cut or fill slopes. One or multiple liues of interecptor trench dr�ins should bc inslallcd, as required, on thc uphill side of ihe areas to bc graded tc interccpt aud safely drain away surfacc runoff and near-surf.•icc ground��ater ilow. Perntanent cut slopcs or fill embankmenls shoidd be secdcd and vegetated as soon as possible for erosion proteclion and long-lcrm stabilil}', and shoulcl bc covcred wilh plastic shcets, as rcquired, to proicct thcm from crosion by storm��atcr until thc vcgclatiou is fully cstablishcd. I;XCAVA'1'(ON SIIOl21NG We eslimatcd lliat the consiniclion of the proposcd residcncc will require cuts to 15 fcel dcep or morc. In areas whcre thcrc me i��suflicient spaces for sloped cuts, temporary shoring walls, in combination wiU� slopcd cuts recommendcd abo��e, may be requir,:d for the exca��ation rctention. [f requircd, wc recommcnd that tcmporary slioring walls be constructed of ca�;tilever soldier piles �vith limber ]agging. It consists of discrete soldier piles spaced ttorntally at 6 to 8 feet on centers, with timber boards laggcd betwcen tlie piles. 7'he soldier piles nrc composed of steel beams set in drilled holes rilecl with Iemi concrele. 7'reated timber lagging bo�rds should be used for Qie shoring walls if the shoring walls arc expectcd io ser��e t'or a duration mare than three months. LIU & ASSOCIATCS, INC.