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i <br /> th� site. "PI-�c sctdcment data should be provided to the gcotechnical encincer immcdiately aticr thc <br /> readings are taken so that we may review and comment as appropriate. <br /> Initial elevation readings of the setdemcnt plates must be obtained when they are installed and before any <br /> fill is placed—site till or preload fill. If this is not done, the initial settlement beha��ior of the preload fill <br /> will not be recorded and the total mabmi[udes of setdemcnt and rate of settlement will be unkno�m. <br /> nd thc ad acent round surface should be mcasured hvice weckly during till <br /> The elevations of the plates a ) S <br /> placement and once a week after complMion of filling so [hat setdement progress in rclation tu the <br /> amount oF fill in place can Ue obsen�ed. <br /> Mcasurement rods tha[ extcnd Crom the setdement plates through the fill will inhibit the mobiliq uf <br /> earthmoving equipment to some extcnt. "Chc contr�ctor wil! havc to excrcise care to acoid dama�:inc thr <br /> rods. The construction documents shou!d rmphasize thc impu�tancc ol protcctine die sctticment platc, <br /> and measuring rods from disturUancc. <br /> SHALLOW FOUNDATIONS <br /> General <br /> Shallow foundations are only Uc feasiblc for lightly-loadcd structures or for structures that are not <br /> ;ensitive to setUement. We recommend that deep tbundations be used for the heavily loaded s:ructures. <br /> Shallow i'oundation recommendations arc provided herein for use on miscellancous lighdy-loaded <br /> structures that have been preloaded. These swctures may be supported on shallow foundations provided <br /> the mcommendations describcd in this report with respec[to setdement and preloading are incorporatcd in <br /> the design and operation of thc proposed facility. As the site is underlain by compressible organic soils, <br /> excessi��e settlement may occur under the following conditions: <br /> • Unanticipated surcharge loads are placed in the vicinity of the shallow foundations, <br /> • The footings nre not founded on the recommendcd thickness ot compacted structural fill, ancL'or <br /> I • The foundation areas are not pre-loaded as recommended. <br /> Allowable Bearing Pressure <br /> Pootings for lighdy-loaded foundations may be designed using an allo�vable soil bearing value of <br /> �,500 pounds per syuare foot (pst) provided they are founded on at least 2 fect of properly compacted <br /> structural fill. The allo�vable soil bearing values apply to the total of dead and long-term livc loads and <br /> may be increased by up to one-third for wind or seismic loads. <br /> �Ve recommend that the spread footings be founded a minimum oC iS inches below the lowest adjacent <br /> grade. Perimeter or strip footings should have a minimum width of 24 inches. <br /> Settlement <br /> Provided the footings are supported on at least 2 feet of properly compacted structural EIl that has been <br /> adequarely preloaded, wc estimate the pos[cons[ruction total settlement of shallow foundations�vill range <br /> up to 1 inch. The majority of the settle:nent will occur rapidly, within four to five weeks after application <br /> of loads. lliffercntial settlements along a 2�-foot section of foundation should be less than 1/2 -inch. �Ve <br /> cxpect ,nost of the ti�otinc setdements «ill occur as loads arc applied. Loose or disturbed soils, and old <br /> lill not r�mo�cd t�om th� �i�otin� �.�ca�'atiun prior to placing concrete will msult in additional sctticmcnt. <br /> /�ilrNo.6'JSi-0!l4-LO Yabell GEOENGINEER� . <br /> � OcloLer l;.?006 <br /> —,—_ __— ___ - . . _ ._. ._ _ -'_. _ - _ <br /> F <br /> . -��.�m- .... '• - ... ��:.��'i . , . . <br />