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� � � <br /> � �° � Report <br /> c H Cronin O�stom Hom�s <br /> � � � J�nu'sry �0, 1991 <br /> K z � P�;e. ti <br /> H �1 <br /> � N K7 <br /> N H <br /> c z �r P:�`�'E�IE\'I' DLSIG\ <br /> � H O <br /> � c�n o Providin; that the roadway areas arz prepared as described above, a pavzmen[ szction of 2 <br /> � y � inches of asphalt concre[z over? inches of crushed rock base course may be used. The underlyir; soil <br /> � y y is tinz ;ained and will be susceptible ro moismre a�d fros[ heave. To reduce the efiec[s o[ this <br /> °n o ai mattrial, I recom-nend tha[ •s 6 inch blanke[ of ;lean sand and gravel bz olaceci below the base course <br /> roy y material for added protection and read�.vsy strengch. The existing si[e soils should bz crowned under <br /> H O V� <br /> ;hz ro2dway to promote drain�;e from under tha pavzmen[ sec:ion. Tfi;; Ci:}' of L-vera:t m�nimum roz <br /> standards may control [he desi;n thicknesses. <br /> FOUYDATIOVS <br /> Founda:ions for the stcucmres will havz to be evalua[ed on a sitz .nd strecture desi;n hasis. <br /> Sinc� :he till wzs noc r.�onirored whzr, it was placod, toundations will hava ro excead through rhe till. <br /> Foundacion types common for [his eondition ara stru�cural kill pads, open drilled piers, augercas[ P�1es, <br /> and control densiry fill (CDF). Stcuc[ur�I till pads sfiould es[end ro the ur.derlyin, native soils. The <br /> ,'��... ed;e or [ne t:ench excava:ion should axcend horizor.cally oucsida oi [he ed;e o: foo[in; a minimum o: <br /> �"�`� thz overzxcavztion dep[h. Open drilled piars t��pically cannot be usetl in sand bzfuw water due to <br /> � cavin; oi the hola. Soma of [he soil cor.di[ions obsen�ed �vould no[ be suitabla for drilizd piers. <br /> I <br /> �'� Augereas: pi!es caa ba uszd •snd :+re wc;!l sui[ad for Seing foundul inro a �vec sar.d deposi[, buC� ey ar� <br /> ��� <br /> rypicalfy tha r.lost d�parsive option. CDC is a lo�v screr.,:h hi;nly tluid concre[a product that :s <br /> poured IC[0 f'. i:'.1�P. :�:fli dX[dRiIS tFrou;h :`�� tlll to a.;propriata baarin� ir.�c�riaL Tl:a banati: this n�s <br /> � � w'nen comp�r�:: [o ene s;re:mral till pad is tha; [he trer.cn wid[h does nec need co bz r,iucn largar :h�a <br /> � <br /> the footin; widd�. It may be an approp;iate al:zrna[ivz cn some of the sices. Somz caving a�u <br /> ' cfe�,nin; o[t::a axcavation bottom should bz axp«�zd in the CDF trz.^,ches. <br /> ��s� Additional explorations would be cequired on si[a for [he drilkd pier or au;ercas[ piles <br /> � <br /> solutions. This �vould 'ua n:cessary ro de:e:mina chz oruper dep[n o[ pene[ration o[ �1c oile in:o <br /> ��a. bearin; a[ spazinc house lucations. <br /> liTILITIES <br /> \�'s` All utili[y trench Uack:till in roadway .reas below ? fee[ should be compacted ro a minimum oP <br /> 90 percent of i[s maximum dry densiry (AST\f D-15�7). Backfill «�ichin [wo fea[ of [ha ;round <br /> surface sho�ild be compatted ro 9� percer.[. The bac.l•till should be plxed in uniiorm litts wich a <br /> thic�:ness anpropria[a to [h� comn:ic:ion e;::ipmzr,t us�a, and r,ot morz dian 1^_ ir.ci.es. Tilz upp�� <br /> COli�T�GTT� GLOTL•CH�IC:�L G\GL\1:CRL'�G <br />