8709 10TH DR SE 2016-01-01 MF Import

Repor[ � � Cronin Cusmm Homes January 30, 1991 Pa;e 6 PAVL\IG`7T DLSIGN Providing dtat the roadway areu are pcepanA as dtsc:ibzd above, a pav=men[ SCCtio� oP ? inches of asphalt cancrete over d inches oP crushui rock base:ourse msy be usui. The underiyin�soil is tine ;rained and will be suscep[ible ro moismre and fros[ heave. To rzduce the efiec[s of :his material, [ recommend U�at a 6 inch blanket of cltan sand and ;ravel be placut below the bue course material for added pro[ection and raadwxy strong[h. 'I'he exiscing site soils should be ccowned under the roadway to promote draina;e fmm under the pavement section. The City er 6verett minimum roxo seandards may control che desi;n thic}:nesses. GOUYDATIONS Foundations fur the strucmms will have to be av�luated on a sita and stmcture dzsign b;uis.. Since the till a�zs not moniromd when i[ was placed, ioundacions will hava ro extend �hrou;h the G!!. Faunda[ion cypes commai for ehis condition aro strucmrat till pads, open drilled piers, augercut piles. , and control density titl (CDF). Strucmrz! till pads should extend to the undedyin; native soils. The '�.. edge oP ths trznch excava[ion should ar.tznd hurizont.11y outside o[the edga of footing a minimum oP �he overexc�vation dep[h. Open drilied piecs cy�ically cannoe be used in sand below water due m cavin; of the hole. Somz oP the soii conditions obsen�ed a�ould noe 6e suitabla ior drilled piers. Au�erc�sc pilzs can be used and arz wetl suited tor b=ing foundal into a wet sand deposit, buC they aro typicaliy tht n:ost expensivz opeion. CDf is a low seron,th hi;hiy Fluid concrete pmduct th�t is pourcd ir.to �e:zn.h ch�t:stends th:ough the till m �npropriaw bearin� ma[zrial. Thz ber,etit chis h�s when compar� to th� st;ucturat iill pad is that[he trencit �vidth does wt nced to ba n;u.h larn,er than the fcotinr, width. 1[ may be an �ppropriate alttrna[ivz on some oi the sires. Soma caving a�d deanin;ot[h�axcavation bottom should be esptcmd in tho CDF trznc�es. ��I o� Additional esplorations would be mquired on sice fer the driiled pier or au;ercasc piles gI Fi'� solutions. This would be necessary ro deeerminz [he proper depth ot penetration of the pile mta I brarin;a[spe:itic house lucslans. DTILITIL•S All utilitv trcnch backtill in rwdway dCt�S I70IO�V � feet should be comnacted ro a minimum ot 90 percent at its maximum dry densiry (AST�f D•1557). Backfill within ewo fez: of [he ;round suriace should be compac[ed ro 95 ptreen[. The backtill ehould be placed in uniiorm lifts wieh a thickness appropriaee to thz compaetion equipmtnc used, and not morz [han l2 inches. The upper COUVRGTTB GEOTL•CkCVIC�IL E�GINELRLI'G