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3V:DT �� 9I�80 3JI1 2Q1 <br />NEXTEL CommunicaUons, Inc. <br />Aupust 16,1999 <br />YT6E TZ8 90Z:NOI1tYJCr1 <br />9�91�1•13127�] <br />Pege 4 <br />Temoorarv Drainaae: We recommend that initlal site preparaUon involve intercepUng and diverting <br />any potential sources of surface or near-suAace waterwithin the construction zones. Because the <br />selecGon of an appropriate drainage system will depend on fhe water quantlty, season, weather <br />conditions, conshucUon sequence, and contractors methods, final dectsions regarding drainage <br />systems are best made tn the fleld at the tlme of construction. Nonelh�iess, we enBapate that <br />berms or ditcfies placed along the uphill side oF thc work areas will adequately intercepl suAace <br />water runotf. <br />�learinu and �rubbina: Once surface runofl is cantrdled, site preparatlon should Include dearing, <br />grubbing, and removal of ail vegeWtion, sod, topsal, any organic-rich soils from foundallon and flll <br />areas. Based on the observed soil conditions; we estimate the stripping depths needed to remove <br />vegetatfon and topsoil will be negligible, with possible locaiized deeper sMpping required for <br />removal of root balls. <br />Excavadons: Site excavat:�ns ranging up to about 2(eet deep may be required to accommodate <br />shallow fooGngs. 6ased on o�r exploraUons. we an�cipate that these excavations will encounter <br />medium dense gravelly sands. These so;!� can be excavated with conventional earthworking <br />equipment <br />terin : Our exploradon dfA not encountered groundwater, however, i( groundwater is <br />encountered during site excavations, we antidpate that an intemal system cif ditches, sump holes, <br />and pumps wili be adequate to temporarily dewater the excavatfons. <br />7em�or�r�ur Slooes: All tempor•�ry soil cuts assodated with site regrading should be adequately <br />sloped back to prevent sloughing and collapse. For the medium dense gravelly sands lhat will <br />likely be exposed in on-site cuts, we tentatively recommend a maximum cut slope Indfnatlon of <br />1H:1V. However, appropriate indinaUons will ultimately depend on the actual soil condidons <br />exposed in the cuts. It is the responsibility of the conUact�r to ensure that tha excavatlon Is <br />properly sloped or braced fa worker protecction, in accordance with OSHA gufdelines. <br />Subarade Com�actior�: We recommend that subgrades for ttie equipment shelter foundatlon be <br />prepared by proof-rolling the exposed native subgrade to a flrm, unyielding state. Proof-rolli�g can <br />be done mosl eHectively when the sals are at or very near thefr optimum molsture content If the <br />specified wmpaction level cannot be achieved due to high soil mo(sture conditlons, the wet soil <br />should be overexcavated and replaced with sukable, propery compadad, imported backfill. <br />Frozen Subarades: If earthwork takes place during freezing conditions, we recommend that all <br />e�osed subgrades be allowed to thaw and then be recomp�cted� if necessary, prior to placing <br />subsequent If(ts oi slruchiral fill or foundation components. <br />S1W011DPRn�n9 Fq�S�`M�1�OOOs113731 NeWJ4.ltl E�It W[.rjp <br />SI/9 #: �aIMf3 OAN Hl.� tl�pY: A1dIS:Z : 66-9I-8 :A9 JAC�3S <br />