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1l-14 -RIND -11SSO(IZES TA06 NORM Memo TO: Joel Hanson, City Administrator Honorable Mayor and City Council Members FROM: Lee Elfering, City Engineer DATE: August 8, 2007 RE: Foundation Correction Costs — 3167 Spruce Street As requested, we have investigated estimated costs for addressing the poor soil conditions on the above referenced site as it relates to the construction of a Public Works type building. For the cost determination it was assumed that the Public Works building would be a concrete structure approximately 10,000 square feet and rectangular in shape, the salt storage shed would be between 1,500 square feet and 2,000 square feet. Two options exist for constructing an adequate foundation for a building. The first would be to excavate the poor soils and replace them with a suitable foundation material, the second is to construct the foundation on top of some form of geopier or pile system. Both of these options were outlined in geotechnical report that was prepared for the site along with general assumptions on the building. Due to the anticipated position of the building on the site and the depth of the poor soils, simple soil correction for the building foundation would be difficult if not impossible without impact to adjacent properties without the use of sheeting. However since the exact location, size, and shape of the building is not known at this time we did contact an earthwork contractor to provide an estimated cost for a correction on the buildings of the sizes assumed above. They indicated that a typical number for soil correction is approximately $10.00 per cubic yard. This can vary depending on depth of the correction, soil conditions, existence of contaminated soils, and the location of available fill material; but is a general estimate for budgeting purposes. Based on that unit price and the recommendations within in the soils report, the anticipated cost of soil correction is approximately $135,000.00. Any sheeting required to eliminate impacts to adjacent properties would be in addition to this cost. Several options exist for providing a building foundation support without the removal of the existing soils including steel screw anchors, pilings, or geopiers. These methods result in minimal material being removed from the site and could be constructed within the limits of the site. The soil boring report was provided to Contractors specializing in the installation of these foundation methods as well as manufacturer representatives to determine estimated costs for the various support systems. The costs for a foundation system for the main building regardless of the method was between $80,000.00 and Memo - 080807 -CC (3167 Spruce Street Soils Correction) 10062 Flanders Court NE — Blaine, MN 5P' 3 _ Ph: (763) 780 -0450 Fax (763) 780 -0452