03-27-2002 Council Agenda - Laserfiche WebLink

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March 20, 2002 File: 803950J Honorable Mayor and City Council City of Little Canada 515 Little Canada Road East Little Canada, MN 55117 -1633 RE: KNOX PROPERTY Dear Mayor and Council Members: As requested, we have reviewed the soil boring reports, City Council meeting minutes, and other information received for the Knox property. Based upon our review we would offer the following comments. Pre - development topography was reviewed to evaluate the original vertical relief and the location of low areas on the site, which can typically be an indicator of the presence of poor soils. As shown on the attached pre - development topography exhibit, a low area existed along the south end of the property by the railroad tracks and at the northeast corner of the Knox property. In addition to the review of pre - development topography, two soil boring reports were examined. The first report was prepared by Twin City Testing in 1993 prior to the construction of three lumber storage structures. Braun Intertec prepared the second report in January of this year for Drywall Supply, Inc. All borings were taken on the east half of the property and most indicate between 5 and 11 -feet of fill material over varying layers of peat (muck) and /or lean clay. Peat and lean clay material are not capable of supporting building foundations. The supplied soil boring reports indicate the need for an alternative foundation system to provide an adequate support for a building foundation. It was assumed 40 -foot H -piles would be used to provide support for a 200' x 200' office /warehouse building. The additional construction cost for a pile supported foundation given these assumptions would range from approximately $13.00 to $14.00 per square foot. It is important to note that none of the borings taken were to an adequate depth to provide an accurate foundation design. Based on the soil borings supplied, 40 -foot piles would be the minimum length required. The additional cost per square foot of floor area could significantly increase based on the actual length of piles. C: \windows \TEMP\Ltr 03 -20 -02 LC- CC .doc