02-27-2002 Council Agenda - Laserfiche WebLink

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FEB 14 '02 05 :31PM BRAUN INTERTEC P.9/24 Drywall Supply, Inc. I3BXX- 02 -010A January 29, 2002 Page 5 C. Preliminary Analyses and Recommendations C.1. Proposed Construction Although the types, .locations and number of buildings have not yet been formulated, slab -on- grade office /warehouse type buildings are being considered. We anticipate that buildings of this type would generally consist of concrete block or tip -up pre -cast panel walls similar to the existing Knox building. Depending on column spans, building heights and other structural components, foundation loads on bearing wall footings would likely be on the order of 3 to 6 kips per lineal foot await, while column loads cold range from 50 to 75 kips each. Because the existing parking area where the borings were performed a few feet lower than the slab of the existing Knox building, we assumed that site grades would be raised perhaps 1 to 3 feet in the proposed building areas to provide site surface drainage. If our understanding of the proposed construction is not correct, if the actual strucniral loads exceed those reported herein, or if the design or location of the proposed building change, we should be informed. Additional analyses and recommendations may be warranted. C.2. Evaluation of Soil Conditions C.2.a. Affect of Soil Conditions on Structure Support. Although the existing fill has likely been in -place for a long time, the existing fill and underlying organic materials are not considered suitable for building support, i.e. foundations and slabs. While the existing fill could be removed and replaced with compacted till, the underlying organic deposits are too compressible to support new fill, footing and slab- induced loads. The lacustrine soils below the organic deposits are also soft and considered compressible such that tolerable settlements would be exceed as a result of the new fill needed to achieve design grades and overall building loads. Without soil corrections and/or alternative foundation systems, rather large settlements and differential movements can be expected over time as the existing till, and underlying organic materials and soft clays consolidate.