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i � � <br /> CASCADE GEOTECHNICAL <br /> June 10, 1991 <br /> Lyle Blank <br /> Job No. 9105-16G <br /> Page 7 <br /> With the presence of wet soil and yround water in the test pita, we <br /> Irecommend against excavat`nq decner than two (2) feet below the <br /> surface so as to avoid deterioration of the foundation area. <br /> IWe recommend t��:` all footings be placed at least eighteen (18) <br /> t inches below the outside finished grade for frost protection. Tha <br /> � minimum footing widths should conform to the local building codes. <br /> I81ab-on-araee OeiaC� Floot <br /> � he recommend placing the slab-on-grade floor on a subgrade of firm <br /> undisturbed, native bearing soil or on structural fill whir.h is <br /> '� placod on the native bearing soils. Fill should meet the <br /> � recommendations contained in tlie Struaturel Fill section of this <br /> Ireport. <br /> I We recommend placinq a minimum of four (4) inches of free-draininq <br /> material beneath the slab to act as a capillary b:eak. The free- <br /> draining material should consist of clean crushed rock or clean <br /> Isand with a maximum of five (5) percent passing the /20G sieve, <br /> based on the fraction passing the �4 sieve. If this area is to be <br /> � used as living space, a vapor barrier should be placed between the <br /> capillary break and the slab. <br /> � 8trucYural Fill <br /> IThe native, on-site soils found below the topsoil may be used as <br /> structura.', fill as long as the soils are free of any organic <br /> Imaterial and the moisture content is maintaine�9 at or just below <br /> the optimum moisture value, as determined by the ASTM D-1557 <br /> Ilaboratory molsture-density test. At t:he time of our <br /> investigation, the soils were moist to wet. The soils may bu <br /> Idifficult to "dry out" sufficiently for �se as structural fill due <br />