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DAMES & MOORE .5 rA0r >N A t t I a TE 111'1KINLKP,flI <br />The Boeing Company <br />August 2, 1989 <br />j Page 5 <br />TABLE I <br />RECOMMENDED DESIGN SUDGRADE MODULUS "K" AND CBR VALUES <br />Desien Parameter <br />Bearing Soils K (pci) CBR (%) <br />Compacted Fill / Silty Sand 125 10 <br />"! Weathered Till 2CO 15 <br />_.i <br />Concrete floor slabs should be underlain by at least 4 inches of crushed rock or 6 inches <br />of clean sand and gravel with not more than 5 percent fines. This granular layer will provide <br />1 uniformity of support and a capillary moisture break. We further recommend that a plastic <br />vapor barrier be placed between the base course and the bottom of the concrete. The vapor <br />= barrier may be set in a thin sand layer immediately below the concrete for erse of <br />a construction and prevention of tearing the plastic. <br />CLOSURE <br />lift 3 <br />The recommendations presented in this report are provided to the Boeing Company for <br />design purposes and are based on soil conditions disclosed by field observations and the soil <br />exploration test pits. Subsurface information presented herein does not constitute a direct or <br />implied warranty that the soil conditions between test pit locations can be directly <br />interpolated or extrapolated or that subsurface conditions and soil variations different from <br />those disclosed by the borings will not be revealed. The recommendations outlined in ;his <br />0 �h report are based on the assumption that the plan location and development details of the <br />project are consistent with that shown on Plate I and the description provided in this report. <br />If, during construction, subsurface conditions different from those disclosed by the borings <br />f�( are observed, we should be advised at once so we can review these conditions and, if <br />t\ _ necessary, reconsider our design recommendations. <br />