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LSI Adrrpr <br />providc limitcd but sut7icicnt latcral an<I verlicnl support cnpacily during s�nlic (non-scismic) conditions. <br />Ilowevcr, Ihc bcaring capacily of Ihe polenlially liqueliablc soils �vould bc grcatly reduced duriuo a <br />scismic event. lu order �o mitigate ihe potential scismic hazard, ���e recommcnd a �ower foundniion <br />syslcm ihat fidly penctrates �hc upper polcntially� liqucti:iblc dC})OSIIS. WC IIOVC �)1'O\'idcd soil desigu <br />p;�rameicrs lo allo�t� design of a drilled picr foundaiion th�u wnuid prn�•ide ndeqwne supporl cnpacity lor <br />thc proposcd communic�ition to�vcr. A shallow to�t�cr f'otntdalion suppor�, such as a"mnC' I'oundatian, is <br />not rccouurn:nded al Ihis sile for henvily �oaded suiictures duc lo Ihc risk of foundation sctllement nnd <br />tower d;imagc during � seismic event. Lighlly loaded slruclures, such as ihc typical equipment huildiug, <br />mny be suppor�ed Uy cunvenlion:J sprc�d foolings if addilicmal scismically-induced setllemcnt can hc <br />tolci;�ted. If Ihcsc slruclurc.; arc nol sctticmcnl tolci:vit, thcy mny bc supporlcd ou deep fouud�Uions <br />peneUating Ihc liqucfiable depnsits. We undci:stand the prorosed �owcr at this silc would consis� of a RO- <br />fool ntonopole. This type of sinicture derives stabilily printarily by pnssive presswr acting against die <br />en:heddcd pier faundatiou. Becnuse of dic strucUuc typc and limiled height, signiliautt lateral forces <br />�vould develnp. Ilotvcvcr, �hc upper soils ut Ihis sitc are saturated and soft, ancl �vould proviJe only <br />III1111C(I IiIICf:II fC515I:mcc, cspccially in evem of a signiticant scismic event. <br />Sile Prepm•n(io�i <br />Site preparatiou will im�ol��c rcmoval of Ihc near-surfncc soils, limiled gi:�ding, and proparing subgr.idcs. <br />Tlie follot��iug conuncnls and recommendations apply lo sitc prepmation: <br />Clenring :md (inihbing: GVe do nol auticipate that significnnt grade chnnges ���ill be required lo achie��e <br />proposcd sitc grades. A1 tl�is locntion, sile preparaliou ���ill consist of rcmoval of the gra��cl laycr, lhe <br />lopsoil layer ;md limited gi:�ding, follo�vcd by Cuundalion prcpai:riion lirr the monopolc �o���er nnd <br />cquipmcnl cahincl fowidaiion. Backiill m�ucrixls, �vhcrc rcquircd, should be placcd aud compiic�cd <br />according to Ihe recumincndations presenled in Ihe Slructural Fill scction of Ihis reporl <br />11'd Conditigns: Tiecausc of Ihe lituiled fines cuntcnl uf thc nc,�r surf.icc sitc soils, Ihe cxisling site soils <br />bclow Ihe surtici;il pavement nrc considcred mudcralcly moistmo-scnsi�ivc but �vill he prone lo <br />dishirbance �vhen escessively wcL 'I'hc cuntraclor should minimize tra(fic �ibove ihc prepnred subgradc <br />areas to minimizc dislurbance and snflcniag ���hicli t��ould requirc rcmo��nl of Ihe unslable soils. During <br />�vcl conditions, lhe usc of a working surlace uf quarry sp+ills m cican s:md :md gr;ivcl ma�� be reyuired to <br />prolcct Ihc suhg��dc, especially Gom vehiculnr irnffic. <br />Frp?en Suherades (f enrlh�vork fakes place dw'ittg �icezing cnndi�ions, we recnmmend lhal all erposed <br />subgrndes be allowed lo thaw �md be recompacicd prior to placing subsequent lills of su uclural fill. <br />\'cman\l'iielesc .\ugirst4.?00J � <br />:\A.�pt Pmi��� `�o. \l'Alli.977? Pagc J 7 <br />� <br />