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4 <br />Howard , Needles. Tammmen & Bergendof f <br />July 16, 1985 <br />Page two <br />The site is bounded by Terminal Road (County Road B) on the north. The <br />Minnesota Transfer Railroad cuts diagonally from southwest to northeast <br />along the southeast side to the site with a spur running north along the <br />west side of the site. <br />Subsurface Conditions <br />Since flight auger borings were used, only disturbed samples were <br />obtained. It is therefore difficult to assess the density or consistency <br />of the subgrade soils. The subgrade soils may also vary between the <br />borings and at different times. If different conditions are encountered <br />that would appear to adversely affect the construction of the athletic <br />fields please contact us for our review. <br />The borings indicate approximately 1/2' of fill consisting primarily of <br />lean clays and clayey sands overlying sandy lean clay till and lean clay <br />fine alluvium. No groundwater was encountered. These soils tend to be <br />relatively impermeable. <br />Discussion <br />We understand you intend to place athletic related facilities, such as a <br />softball diamond, at this site. Since the subgrade soils are relatively <br />impermeable, we suggest sloping the athletic fields in such a manner that <br />the water will drain off the field and not accumulate in pockets. We also <br />understand you will be using a product such as Aglime in the baseball <br />diamond areas as a surfacing material for the infield. <br />Our experience with granular material such as Aglime is that water will <br />permeate through the materials rather rapidly; however, if the subgrade is <br />not sloped properly, the water will accumulate and eventually build up in <br />these materials. Therefore it is essential that the subgrade be sloped <br />where the Aglime is applied to ensure proper drainage of the playing <br />area. <br />If athletic facilities such as tennis courts were to be provided, one must <br />consider that these site soils are frost susceptible, and therefore a <br />playing surfacecould become uneven with time due to differential frost <br />heaving. <br />If a granular base is used under such a facility, the base must be drained <br />so that water will not accumulate under the slab contributing to the frost <br />heave potential. <br />