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i <br /> � <br /> � Loculizcd zoncs of perched groundwatcr will likcly be encountered across the sitc. Dascd on the <br /> conditions in our cxplorations completed at thc Casino Road si�e, wc expcct thc quantities to be rclatively <br /> minor and cun bc hnndled adcquatcly with collcction ditchev and sump pumps. Rased on rcview o( <br /> prcvious cxplorations completed near 13uilding C (boring D-6 completed by GcoEnginecrs in 1993) and <br /> thc old wctland contour mapping, il is likcly thal perched grcundwatcr will also Fx cncountercd at this <br /> loc�tion. Wc do not havc currcnt cxplorution data in this area, but anticipatc that localizcd dcwatcring <br /> can bc adcyuatcly handled hy collection ditchcs and sump pumps. This assumption is based on our <br /> rcvicw of thc prcvious rc�rt, Ihc rcgional grounJwutcr tablc is morc than 100 fcet bclow thc ground <br /> swfacc cicvation, nnd thc fortncr wctlnnd arca is locatcd south of 13uilding C. Additional cxplomtions <br /> can be accomplished at thc proposed cxca��ation site to nbtain currcnt groundwater levcls, if desircd. <br /> I Since the contractor has control of the conslruclion opetations, the contractor should be made responsible <br /> for Ihe drwatering methods used, shoring, stability of cut slopes, as well as thc safcty of thc excavations. <br /> The contractor is present ui the si�c continuously and is bcst ablc to ohserve changes in site and soil <br /> I conditions and monitor tlic perfortnancc of excavatiims. Slope inclinations may necd to be mcxlified by <br /> thc comractor if localixed slnughing occurs or if seepagc occurs. All dcwatcring, shoring and temporary <br /> slopcs should confomi to applicablc local,stma and fcdcral safcry rcgulations. <br /> ITemporary Slopes <br /> We r�comtncnd tcmporary cul slopcs in Ihc cxislin�! lil� bc inclincd at IIh1V(honzontnl to vcnical) or <br /> ; (latter depending on IocalizcJ sloughing. S�ccper inclinations up Io '/.I1:1 V arc acceptable in the lok�cr <br /> ' vcry dcnsc glacial deposits. In addition, wc rccrnnmcnd the following pmccdures for opcn cWs at thc <br /> silc: <br /> • No traffic, construction cquipmcnt,or supplics allowcd at Ihc top of cut slopcs for a distancc of at <br /> Icast 5 fccl from thc top of thc cut. <br /> . Iixposcd soil along tcmporary wt slnpcs should Mc pmtcctcd liom surfacc crosion using <br /> watcrproof lurps or visqucen,when appropriate. <br /> • Cnnstruction SIlO11Id I7C SCIII`(I11ICd 50 that the Icngtli of time thc �emporery cut is lefl open is <br /> minintizcd. <br /> • lirosion control mensurcs should be constructed ns appmpnate to rcduce runoft�Gum the site. <br /> • Surtacc watcr flow should bc divcrtcd away Irom all cxca��ations. <br /> • "fhc gcncral condilions of thc Icmporary cut slopcs should bc obscrvcd periodically by a <br /> gcotcchnicnl cnginccr�o idenlify putcntial prohlcros. <br /> IStructural Flll Content <br /> I SWCIl1f�I �III SOII I11USI hC �fl'l' O� Sl�tll�ll'8N llChflS, organic contaminants and rock I'ragments largcr than <br /> 6 inchcs. As thc amount of tincs (soil pnnicics passing U.S. Standard No. 200 sicve) increases, thc soil <br /> hccomcs morc sensitive to small changes in moisture contenl and ndequatc compaction becomes morc <br /> diflicult tu achicvc. <br /> During wct wcathcr, wc rcrnmmcnd slrucU�ral fill consisi of sand and gravcl with Icss than 5 perccnt <br /> passing Ihc U.S No. :.00 sicvc. During dry wcathcr, structural fill placcd below Ihe recommended base <br /> � coursc laycr can contain an incrcascd fincs conlcnl, providcd Ihat the minimum compaction critcria can bc <br /> achicvcd. "1'hc maximum partidc sizc for gcncral sitc grading should bc limitcd to about six inches. <br /> I <br /> ( File No 1041.O1 Y�P) POAf S �ifOENGINEEl1� <br /> A/m':'.:11114 <br />