1402 SE EVERETT MALL WAY FREDERICK AND NELSON 2018-01-02 MF Import

inch, with differential settlements across an, structural '+ay of 1/4 inch or less. If planned finished grades chang'� during co:;struction such that less fill will be placed at the building site, it is conceivable that some foundations could be supported on existing pavement materiels, or on undisturbed glacial till. In the latter case, differential settlements larger than those indicated above could occur between fill- and till - supported footings. Should site grades change significantly from those indicated in this report, we should be consulted. FLOOR SLAB AND PAVEMENTS We recommend that the floor slab be underlaip by at least 4 inches of washed gravel or crushed rock, or by 6 inches of very clean sand and gravel. if silty native soils are used to raise site grades, a moist.,ire barrier should be provided beneath the slab. Settlements of the slab are expected to be very small, assuming normal, relatively light storage loads. We recommend that new pavements be constructed of asphaltic concre`.%-. overlying free -draining, high -quality granular base. Two inches of asphaltic concrete and 7 inches of granular base should be sufficient for parking areas. The thickness of the asphaltic concrete should be increased by 1 inch along travel lanes and roadways, and in front of loading docks. If angular crushed rock is used instead of high -quality, pit -run granular base, the thickness of the base course layer may be decreased from 7 inches to 4-1/2 inches. CONCLUSION The recommendations provided in this report apply only to the proposed Frederick & Nelson Department Store and are intended for design purposes. If design concepts mentioned in this report change, we should be consulted and given the opportunity to modify our recommendations. Information In this report may not be sufficient for foundation design of C:!