1618 47TH ST SE 2016-01-01 MF Import

(�co�cclini��;:l I�n��im.�:rim� Itci,��;�t � Jinglc-P:inuly I�c,iJencr E•:erett, Washintton Peccmbcr 9. 3fi05 � CG File No. ?fil7 � Page 12 i � thc �vall should cxtcnd a liorirontal distancc at Icast cqual tu thrcc timcs the fuundution dcpih. A fuctur of � safety of 2.0 has been applied to thc passive pressure to account for reyuired movements to generate ihese � pressures. The friction coefficient docs not include a factor of safety. All�vall backfill should be�vcll compacted. Care should be taken to prevent the buildup of excess lateral � soil pressures due to overcompaction of the wall Lackfill. This can be accomplished by placing wall I backfill in 8-inch loose lifts and compacting widi small, hand-operated compactors. � Slahs-On-Grade � Slab-on-grade areas should be prcpared as recommcndcd in dic Site Preparntion and Grading subsection. Slabs should Ue supportcd on medium dense to very dense native soils, or on structural fill � extending to thece soils. \Vhere moisture contro] is a con�em,wc recommend that slabs be underlain by G inches of frec-draining coarse sand or pea �mavcl for use as a capillary break. A suitable ��apor barzrer, � such as heavy plastic shecting, should be placed over the capillary break. If slabs are poured ovzr fill or eQ�cr loose soils, we recommcnd using transitional slabs. Transitional slabs usually applicd to dm�eways or outduor slabs, and are attachcd to Uic Uuildings foundation ��ith rebar, «hile the opposite end is Gee to � move with any scldement that may occur. This reduces differcntial "hcights bchvecn the slaU and thc foundation that can occur when a slab setQes but thc foundation docs not. � Drainagc j �Vc recommcnd that runoff from impervious surfaces, such as roofs, driveway and access ruadways, be I collected and ruuted to an appropriate storm �+�atcr discharge system, described bclow. Final site grades should allo�� Cor drainage a�vay from any Uuildings. �ye sugges? that the finished ground surface be sloped at a gradient o1'3 percent minimum for a distance of at least 10 feet a��ay from the buildings, as indicated in IBC Section 13033. Surface watcr should be collected by permanent catch basins and drain lines, and be discharged into a storm drain system. Surface water shoidd not bc allo�^ed to �ow onto the steep slope. �Ve recommend that footing drains be used around all of the strucmres wherc moisture contro] is imporiant. It is good practice ro use footing drains installed at least 1 foot bclo�v the pianned finished Iloor slab or crawl space elevatiun to provide drainage for the crawl space. At a minimum, the crawl � space should be sloped to drain to an outlet tied to the drain2ge system. If drains are omitted around slab- I i Cornerstone Geoiechnical, Inc. 13fz5 ��