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1 <br /> � and individual column footings supported on s[ructucal fill may experience on <br /> the order of I/4 to 1/2, and 1/2 to I inches of settlement, respec[ively. As <br /> � indica[ed by the above se[tlement estimates, the load-set[lement behavior uf <br /> footings supporced on native soils and on structural fill are expected to be <br /> � somewhat �!iEferent. The potential ditferential set[lements vhich could occur <br /> be[ween adjacent footings supported on native soils and on structural fill <br /> should be considered in design. <br /> IWe have developed esttma[es of the vertical s��bgrade modulus for both <br /> native and str�ctural fill hearing soils, as requested by Mr. Greg SchindLer <br /> � oE KPFF Consul[ing Engineers. We estimate that [he native till and outwash <br /> soils will have an average vertical sub�rade modulus of abou[ U 0 pounds per <br /> I cubic inch (pci). The vertical subgrade modulus for stri�ctural fill placed <br /> in accordance with our recor.vnendations is expected to be about SS pci. These <br /> � values apply to a I-[oot-square footing. Yhe value Eor a footing of different <br /> �iidth can be compu[ed in accordanc.e with the following approximate rela[ion- <br /> ship. <br /> 1 K = K1 / B+1�, <br /> \2B <br /> IWl�ere: K = Vertical subgrade modulus for footing of width B <br /> R = Footing vid[h ln f.eet <br /> IX1 = Ver[ical subgrade modulus for 1-foot-square footing <br /> The verti.cal subgrade modulus for both native and structural fill bearinq <br /> Isoils is expected [o be somewhat higher under shor[-term wind or seismic <br /> loads. Based on engineering judgment, it is our opinion [ha[ a 10 percent <br /> increase in the basic values presented above would be reasonable for short- <br /> term live lead conditious. <br /> SLAB SUPPOKT <br /> The lower floor sl.ab for Che Phase 2 building as well as the slabs for <br /> � o[her project Cacilities ci� ',�e suppor[ed on-grade provided that slab sub- <br /> grade areas are prepared a:, .�ecommended above under SIYE PREPARATION :\\D <br /> EARTHNORiC. <br /> We recommend [hat a base course layer consisting of a minimum thickness <br /> of 6 inches of clean free-drainin� sand and gravel meeting the gradacion re- <br /> qairements pr.esented in TaLle 3 be placed benea[h the floor slab for the <br /> �hase 2 building to provide uniEorm support and a capillary break. An <br /> i3 <br /> - io - <br /> GeoEngineers <br /> Incorporafed <br />