09-22-2004 Council Agenda - Laserfiche WebLink

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Aug 26 04 07:55a Jon Whitcomb 651- 430 -0029 PUG 25 '04 02:38PM BRAUN INTERTEC P, 9123 P 9 Wesley hivestruents, Inc. Project: SP -04 -03734 May 21, 2004 Page 4 C.R.c. Proposed utilities. We understand that City sewer and water will be installed to service the development and storm sewer constructed for drainage C.l.d. Precautions Regarding, Changed Information. We have attempted to describe our understanding of the proposed construction to the extent it was reported to us by others. Depending on the extent of available information, assumptions may have been made based on our experiences with similar projects. If we have not correctly recorded or interpreted the project details, we should be notified. Additional analyses and revised recommendations may be necessary. C.2. Suitability of Existing Soils The swamp and lake deposits are considered compressible and unsuitable for support of residential foundations and floor slabs. We recommend that these materials be removed from below proposed building areas and replaced with compacted engineered bacldrll. The underlying glacial till is considered generally suitable for Support of the proposed structures, though locally, some excavations may be needed to remove the upper portion of the clay where it is soft. Rather soft clays were encountered in Boring ST -1 just below the lake- deposits. The need to remove these materials should be further evaluated when exposed during grading_ Relative to the proposed street construction, consideration could be given to leaving the swamp and lake deposits in -place (at depth), and constructing. street embankments and pavements over these organic materials. With this approach, however, significant settlement may occur, especially where higher embankments are placed over the organic materials, Given that utilities will likely he placed within the street, and corrective excavations are warranted to remove organic materials below the utilities, we recommend that organic materials be removed from below the entire street section as well. C3. Groundwater Groundwater is expected to impact construction plans, as excavations to remove swamp and lake deposits will likely extend below groundwater. Groundwater will also affect design plans, as lowest floor elevations will need to be constructed a minimum distance above groundwater. Groundwater elevations Should bb expected to fluctuate both annually and seasonally.