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0 <br />Mr, ,1a3»es Gallo��ray <br />- Sel�tember 6, 201 1 <br />Based oil tlie results of our anaiyses, it is our apinioii thai the slopes are stable and illat tlle additioil as pl�zl��ed <br />will nol adversel_y impact or decrease tl►e stability of the s1oF}e, provided surface draina`�e is conlrolled and <br />preveilted fronl flo�viii� in a►i uncon�rolled mailnei� o��er th� slope crest. Api�licaiion �f�the IBC staiidards ���ould <br />requirc tl�at the additicm foundation be setback a minimum distance of E3 fect froiu thc face of slope as measured <br />f�rom the edge of� the toundation faoiiil� (H;'�}. In our opi�lioil, tliis setback c�n be reduced to a�i�iniiliui�l <br />fiot�ir�ntal distaric� of teil feet. Tflis «iil reyuire de�:pcnin�� tl�e addition footin�s tlsai par�llel thc slope crest. <br />Erosion <br />'[�}lc soils eilcotiiitet�ed ozi-sile arc classificd as L�.verett Graveily Lo�m by the Sc�il Co�tsci�vation Ser�-ice (SCS). <br />1��ith the existinc slope ��radients c�vcr tl�e d�vcloped portion ol� the site, these soiis ���ill havc a]ow potential for <br />erc�sic�n �vhcn �xposed. Ho�vev�r, on il�c st�cp slopes, thes� soiis �viil liav� a liigh potentia] t��r erosion if exposed. <br />Erosion protection measures requir�d by thc City af Lverett ���il� need to bc in pl�ice prior to sta��ing �rading <br />activitti� on tI�e sit�. <br />DISCUSSION AND RECOMA�ILNDAT10N5 <br />General <br />Rased on our study, in our opinion, there are no `�eotechnica] considerations that �vould p��ecludc; development a� <br />proposed. "I�he �ddition can bc, suppo2-ted on cont�ention�l spread #ootin��s bearint on c�mpetent native soils or <br />stru�tural fill ttlat is placed and compacted abovc tllcse c;ompeteni tlative soils. <br />"[�hc t�ative soils encountered at tlic site cc�ivain a stifficieilt amouilt of� soil fitles tl�at ���ill ►nake thein dif�ticult to <br />compact as struct�n�al tiIl �vhen too ���et. '['Ite ability tc� use native soil fron� site e.xcavatic�ns as structural till �vill <br />CiC��CI1C� OIl 1(S fIl03S�llCt CO11IE11� �Il(� ��1� �)1'�\'i1l�lI1� 1i�f',<ILI12I' CdIIdIUClI1S RI 1�1C lllllC {lf COf1SI111CI1OIl, �f �Cr�i{111� <br />�ctiviti�s wil! takc glace during the ���intcr se��tic>>�, t1�e o�vner shc�uld be pre�ared to im}�ori ti•ee-drainin� granular <br />tiialerial for t�sc a; struci�lral till �jn�I bac�:iill. <br />Dctailed recommendations regarding these issues and other teoteehnica] ciesi�n consider�tions are provid�d in thc; <br />falloti�ing sections. These recommend�tions �hould be incorporated inro the final desi�n dra���ings and <br />constructioil spe�ificalioils. <br />tiite Preparation <br />"�'o ��repare the site for construction, all ve�etation, or�anic surface sc�ils, and other deleterious materials should be <br />stripped and re�uoved frorn the addition area, f3ased o�i our obsen+ations, ���e expect that onl�� striE�pin� to remove <br />exisiing vebetalion wiil be requir�d to cxpose soil conditions suifat�te for use a5 ti[1 material, or for support of� ne�i� <br />fil] and buildiilv elerile3lts. Stripped vcget<�tio�i dcbris shouId be removed f�ro�u tl�e sile. rollo�ving strippin�, a <br />i'epreseiltative of Terra Associates sf�ould c�bserve the eKposed soils to ��erif'y thcy arc consistcnt �vitli those <br />described in tl�is report and suitabl� for suppori of new lill or buildinyr elements. <br />Pi-oject N��. T-5471 _� <br />Pa��e '�'o. 4 <br />