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cubic fcet of grout and prior to auger withdra�eal. This will miz any loosc cuttings at the bottom of the <br /> hole with thc grour, thus, developing the requircd end-bearing capacity. <br /> It should be noted that no dircct information regarding the capacity of augercast piles (e.g., driving <br /> resistance data) can be obtained while this type of pile is being installed. Therefore, we recommend that <br /> pile installation operations be monitored by the Geotechnical Engineer or his representative (Geoiechnical <br /> Engineer). The Geotechnical Engineer will observe the drilling operations, monitor b�rout injection <br /> procedures, rccord the volume of grout placed in each pile relative to the calculated volume of[he hole, <br /> and evaluate the adequacy of individual pile installations. We also strongly recommend that a <br /> pre-construction mccting takc placc with thc pilc contractor, thc owncr and the Gcotcchnical Gnginccr to <br /> � discuss pile construction tcchniqucs. <br /> SLAB-ON-GRADE FLOORS <br /> Slabs may bc supported on-grade proviuing thc subgradc sails arc prcpa:�d as rccommcnded un�cr die <br /> "Earthwork" section of this report and that the preload is applied in accordance �vith the recommendations <br /> � of the preloading/settlement section of Uiis report. lVe recommend that the slabs be founded on structur:�l <br /> fill placcd ovcr the native soils. Por slabs designed as a beam on an elastic foundation, a suhgradc <br /> modulus of 30 pounds per cubic inch (pci)may be used for suUgrade soils prcpared as recommended. <br /> IWe recommend that the slab Ue under�ain by a G-indi minimum thickness of 1-!% inch minus crushed rock <br /> with ncgligible sand and silt. The base course will providc uniform s�.ipport and scn c �s a capillap' br�ak <br /> to reduce moisture mibTation through the slab. <br /> If moisture-sensitive coverings are used on interior iloor sl:�bs, a �apor barrier consisting of plastic <br /> sheeting should be installed between the slab and the base caurse. The contractor should be made <br /> � responsible for maintaining the integrity of[he vapor barrier durine construction. <br /> LATERAL EARTH PRESSURE ON PERMANENT WALLS <br /> Conventional cast-in-place walls may bc necessary for small rctaining suuctures located un sitr. 'llu <br /> lateral soil pressures acting on comentional cas[-in-place subsurl;i�r ��'all; ��ill dcp�n� on [he natun. <br /> density and configuration ul thc soil hchind thc ��all and thc amount uC latcral �ti'all moccmcnt «�hich c�n <br /> occur as backfill is placed. <br /> Por walls that are fine to yicld at thc top at Icast one-th�w,andth uf the hciglu of Ihc ��'all, soil pressur�s <br /> will bc less than if movcmcnt is limitcd b} such tactors as ���all stif(ncss or brscing. Asswning that thc <br /> walls arc backlilled and drainage is provided as oudined in the following paracraphs, ��'c recommend that <br /> yiefding walls supporting horizontal backfill be designed using an equivalent tluid densiry of 35 pounds <br /> per cubic foot (pct) (triangular dist-iUution), whilc nonyiclding walls supporting horizontal backtill bc <br /> desi6med using an equivalent fluid density of 55 pcf(triangular distribution). <br /> We recommend that the allowable passive resistance be computed using an equivalent tluid density of <br /> 300 pcf (tria.igular distribution) if these elements are surrounded by structural fill. The shuctural fill <br /> should exteml out from the face of[he foundation element for a distance at least equal to three times the <br /> height of the ele**ient and be compacted to at Ieast 9� percent o(thc i�IDD. An additior.al rectangular <br /> distribution of GH psf(rectangular distribution) should be applicd for thc scismic lateral earth pressure, <br /> where H is the exposed height of the retaining structure. <br /> The above soil pressures asswne that the walls will be constructed entircly in the strucwral till imported <br /> and adequately compacted to raise site grades and that wail drains ��ill be installed tu preccnt th� buildup <br /> i FilcNo.89S7-OOJ-071 Pagc16 �iEOENGINEEfl� <br /> OcfoGcr I l,2006 <br />:'� <br />.,1 _ - -. . __ _. .- :– .—� <br /> � ... , ,re- '� y�y p�,�t , � �d� � \�,Y� S� ,�C•: <br />. „ . .. .. . . � .. .. t.nm,. n[]nYF�� . � S ��uA !$f.��rt.2�,.1�Z ua.?� cr r..�.��.�.+. .x,»,R.e.`. d'���ss'l.f:Q�RN.��.i."W� . <br />