4719 BELVEDERE AVE 2016-01-01 MF Import

e Junc 28, 20G Dssvid and Judy King LX�A ]ob No. GA07G Pagc 15 Ticback anchors may consist of hclical anchors. f Iclical anchors :ve composcd of a Icad scction and scctions of extcnsion ba�s that c:ui bc added on to the Icad section. The Icad scction is made of singlc or multiple stecl hclical flights wclded onto a square steel bar. The hclical anchors can be scrcwed into lhc gmund at a slanted angle with a drill hcad to seat into a firm suil strata t� develop rcquircd pullout tesistance. Ilclical anchors are ce�mmcrcittlly nvailable fmm A. E3. Chance Comp;u�y or All�.s Company. llclical :uuhors, if uscd, should bc scatcd into the undcrlying dcnsc Gsperancc Sand or harJ Whidbey fonnation deposi�s. The pullout capacity of hclical anchers is direc►ly related to the torquc rcquired !o advance the anchor assemblics and the typc of soils into which the anchors are installcd. Whcn seatcd into thc densc Gsperance Sand or hard Whidbcy formation deroaits, we cstimatc a hclical anchor with a Icad scction uf an 8-inch und a 10-inch hr,liccs cmi dc��clop an ullimatc pullout capa�iry of about 10 ton, nnd our rccommendation for thc allowablc pullout capacity of such hclical picrs should not cxcccd 5 tons �xr �ach bascd on a factor of safcry of at Icast 2.0. 13ASN:MEN'i' ANU RF,TAINING WALLS l3uilding bascment ��alls restraincd at the top from lateral movement are considercd unyiclding and should be Jcsigned for lalcral soil pressurc under the nt-rest condition. Retaining walls, if any, unrestraincd at thc lop Gom latcral movcment, may be designcd for active soi� pressura We rccommend an at-rest pressuro of 45 pef equivalent tluid density (GPD) nnd an activc soil rressure of 35 pcf GPD bc uscd for thc dcsign of building basemcnt walls and reta;ning walls respcctively, with Ievcl or descending backslope. For walls wilh an ascending backslope, an :,dditional pressurc of 0.75 pcf per Jegrce of ir,clining nngle of backsloae should be added to the aibovc design soil pressures. To countcr the above nctivc or at-rest pressar^, a passive latcrnl soil pressure of 350 pcf EFD may bc uscJ. 1'his passive pressure valuc is applicable only to walls with a Ievel or asccnding backslope for a horizonlal dis�ance nl i�st l.` times the w�ll height. LIU & �►SSOCIATES, INC.