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� <br /> � <br /> � <br /> � <br /> k� <br /> Settlement Magnitude and Rate <br /> �Ve estimate settlement duc to the approximately ]0 fcet of till that will be placed to raise b�radcs in the �� <br /> northern half oC the site will be on the order of G to 18 inches, depending on the thiclmess of compressible \ <br /> suil (see Pigure 2). We estimate settlement due [o the approximately 7 fcet of fill that will be placzd to " <br /> raise grades in the southem half of thc site will be on the order of 6 to 20 inches. After placement of the <br /> till to raise site grades, we estimate th�t aggre6ate stockpiles will induce on the order of 5 to ZO inches of ;* <br /> additionu! scttlemen[ in the vicinity of the stockpiles. ;�ill volume estimates to achicve proposed site <br /> gradcs should include an allowance for the anticipated setdemrnt. <br /> Our analysis suggests that setdement will extend beyond the limits of thc fill pad and aggregate <br /> stockpiles. We recommend a set-Uack of 20 fce[ from the toe of aggregate stockpilcs to any <br /> sctticment-scnsitivc structure. Additionally, our analysis suggests that potential sctticment along die <br /> BNRR embankment, located approximately i0 fce[east of[he 10 foot high fill pad will Uc on the order of <br /> '/., to'/+ inch. <br /> �Ve estimate that the 5-foot high preload will induce approximately 2 to 8 inches of additional setdement. <br /> "Chis settlement will reduce the post-construction setdements observed in the areas where thc prcload was <br /> placed. Additionally, preloading heavily-loaded structures will help reduce do�vndrac loads on thc pile <br /> supported structures and will reduce differential setdement adjacent to the foundations. <br /> The cstimated setdement assumes that thc soils have not been pre��iously preloaded. 'Che estimated <br /> setdement ma6mitudes may vary substantially based on previous preloading and due to the thickness of <br /> Hic undcrlying compressible soils. <br /> I The �stimated time fcr the setdement to occur is 6 to F, weeks, but the actusl duration of preloadi:�. <br /> i should be based on setdement rcadings. The thicker compressible sil[ layers will require more [in:. � <br /> consolidate and will likcly be on the 8 weck end of this range. The consolidation process coul�! ' <br /> � acceleroted by placing a surcharge fill on top oF the preload till. �Ve can provide specitic surch:�: _ <br /> � recommendations it the prcload time must Ue shortened. <br /> ` We have also estimated the long-tenn settlement for any miscellaneuus li��htly loaded slructures [hat ma�' <br /> ibe constructed as part of the batch plant facility. Thc lnng-tertn setdement estimates assume that thc :at� <br /> grading fill and prcload sctdements are achieved prior ro [he construction and loading of plann�� <br /> structures. �Ve estimate that post-conslruction setdements of tbotings will rangc up to 1-inch. <br /> Differential setdement belween similarly loaded Cootings should be on the order of !�-inch. "I hesc <br /> long-term estimated sc[ticments are based on die prcloads being Icti on the ,itc long enough to <br /> suUstantially complete the cansolidation process for each structurc. <br /> Settlement Monitoring <br /> In order to evaluate the magnitude and timc rate of scitlement of thc site fill or die preload till, we <br /> recommcnd that setdemcnt muni[oring plates be installed prior to placing the preload fi1L Recommended <br /> se[tlement plate locations include ehe batch plant, feed and stacking convcyors, aggregate bins and bulk <br /> aggregate stockpiles, and truck parking area. Eleven settlement locations are recommended <br /> approxima[ely as shown on Figure 3. A detail of a tyPical settlement plate is shown in Figure 4. In our <br /> opinion, it would also be advisable to monitor setdement with surface control points located at edge oFthe <br /> BNRR right-of-way. <br /> IF a settlement plate is dantaged, it should be repaired and resurveyed immediately. Plate elcva[ions <br /> should be referenced [a a stable benchmark, away from thc inIluence of the preload or any fill placed at <br /> FileNo.B')37-OOJ-00 Yub[' 11 GEOENGINEEfl� <br /> Orinhrr I l. 100I <br />� , . __- . _... . � � _ � ti u,, +� r,��5'. <br />) � : r � ! f�i; Y�Ma +�y5Y � <br /> f f�`V' _ _-_' . � ,X �y��;��L�i•,...C"�'t�r}t fi'�'.� .��- , ..:�'� �a .1,fW/o /I r ��"�� n^'��'EdL . <br /> � <br /> s �� �ss % �� �"� <br /> �, <br />