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LSI -ADAPT <br /> 1 conditions,we recommend that tt�e footing and building pad subgrade arcas be protected Srom disturbance <br /> by placing a layer of crushed rock or a mud mat(lean mix concrete) after cxcavatian is cor.ipleto. <br /> Based upon the results of the sieve analyses wmpleted on two near surface soil samples,the nezr surfacc;site <br /> soils appeared to have a very high silt content and would only be suitable for structural fill during the driest <br /> weather conditions. In our opinion, adequate compacdon probabl}� could not be achieved at current so�l <br /> moisture contents. Therefore, as a conservative measure, we recommend site grading be conducted only <br /> during the dryer summer months. <br /> We recommend that the suitability of on-site soils for use as stn�cmral fill be determined in the field <br /> during excavation and construction activity. The coutractor may need to segregate soils identificd as <br /> suitable for re-usc, from soils that are detertnined in qie field to be unsuitable. If the more silt-rich soils at <br /> the site are wet of optimum, or exposed to excessive moisture and cannot be adequatcly compacted, then it <br /> may be necessary to import well-graded granular soils as fill. If imported material is used, it should be free- <br /> draining and have a gradation that meets the minimum speci6cation given below in Table l,unless approved <br /> by the soils engineer. <br /> Tablc 1 <br /> U.S.Standard Sieve Size Pcrcent Passing by Dry <br /> Weight <br /> 3 inch 100 <br /> 3/4 inch 50-100 <br /> No.4 25-65 <br /> No. ]0 10-50 <br /> No.40 0-20 <br /> No.200 5 maximum <br /> Footings <br /> The near sudace stiff or medium dense or denscr native sand soils are suitable to provide adequate bearing <br /> support for the proposed retail building foundation. Thc footing ;:ubgiade soils should be prcpa-ed as <br /> discussed in thc Site Preparation and Gencral Earthwork Scction presented above. Footings supported on <br /> these stiff or medium dense or dcnser soils may bc designcd using an allowable bearing capaciry oC 3,500 <br /> pounds per sqaare foot (psQ. Tl�e upper contact elevation for these soils may be as much as 5 feet or more <br /> belo�v existing site gradcs, based on the test barings. Footings founded on Structural fill placed above <br /> competent native soils may bc dcsigned utilizing an allowablc bearing capacity oP 2,500 psL We <br /> ILSI-ADAPT Job No.WA02-8127 Paye 6 L <br /> Augusl 6,2002 /,f� <br /> I <br />