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BRAUf4 INTERTEC Braun Intertee Corporation 245 East Raselawn Avenue St. Paul, Minnosota 55117.1942 &51.487 -3245 Fox: 4887.1812 engineers and Scion lies Ecrrir,1 the Built and Natal Eavironalan(,t'' April 24, 2002 Project No. BBXX -02 -0108 Mr. Carl Johnson Drywall Supply, Inc 5549 Quail Avenue North Rogers, MN 55374 Dear Mt. Iohnson: Re: Subsurface Soil Conditions and Foundation Design Considerations at the former "Knox" Site in Little Canada, Minnesota, As you requested, this letter is being provided to describe, in general terms, our impression of the overall subsurface conditions at the former Knox site and to convey our thoughts as to how the soil conditions may affect future site development. Soil and Groundwater Conditions Topographic maps published in 1967 by the USGS indicate that the former "Knox" building was apparently located on a shallow hill surrounded on the east, south and west by a low area containing organic deposits that have since been drained and filled. Soil maps prepared bytho Minnesota Geologic Survey and borings performed by Braun intertec in January of 2002 and by Twin City Testing in 1993 indicate and confirm that the low area surrounding the Knox building contains organic materials extending to depths ranging from about 11 to 23 feet. Based on the boring data and the combined information, we suspect the organic material depths increase to the south toward the existing railroad line. Below the organic materials, many of the borings encountered relatively soft, lacustrine (lake deposited) soils consisting of silt and lean clay. Groundwater was encountered in our borings at a depth of about 9 feet. Support of Existing Structures We understand that the former existing "Knox" building was constructed in 1972, Because of its apparent location relative to the shallow hill shown on the USGS maps, we suspect, but it has not yet been confirmed, that the building is supported by spread footing foundations. Although it is suspected that the Knox building was located on the hill where "suitable" bearing soils were found and spread footings were used, the extent of and need for, soil corrections below the building remains unknown. As indicated by a foundation drawing and soils report prepared by TCT, however, at least one of the storage buildings located south of the Knox building is founded on a deep foundation system (driven piles). Some of the existing storage structures also appear to be supported by a drilled pier foundation system. 6- tva 'd 031b3INI mnuaa WdtE:EO 2e, P2 add