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� � �[�� <br />CASCADE GEOTECHNICAL <br />November 16, 1988 Q��, ��'}�88 ,� <br />Job No. 8811-20G � <br />Rainier Capital Management C5'--,j ' <br />------�--------- <br />Page 3 ----- ', <br />gray silty sand with gravel represents an upper, weathered zone <br />of the gray glacial till. All elevations are measured from ground <br />level at the time of our study. <br />A water table was not observed in any of the test pits. The very <br />dense glacial till impedes drainage, so a perched wet season water <br />table may exist. ' <br />CONCLUSIONS AND RECOMMENDATIONS <br />The site appears suitable for the proposed project if our recom- <br />mendations are carefully followed. <br />Site Preparation <br />The uncontrolled fill noted in the test pits is not suitable for <br />structural support or as a pavement subgrade. We recommend strip- <br />ping all building and paved areas of uncontrolled fill to expose <br />the underlying native soil. The native soils observed in the test <br />pits are extremely moisture sensitive and will break down durinq <br />wet working conditions. Therefore, we recommend that all eacth- <br />work take place during an extended period of dry weather. ' <br />Spread Footinqs <br />Spread footing foundations or wall footings that are placed direct- <br />ly on the native, gray, very dense qlacial till may be designed j <br />using a bearing value of 3000 psf if the soil is undisturbed, free � <br />of organic material, and does not become wet prior to concrete <br />placement. Footing widths should conform to the local builc�ing <br />codes. "'�e footings should have at least eiqhteen (18) inches of <br />