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APR 7 195 10:2-9 FROM AM ENG TST ST PAUL TO 97843462 <br />PAGE.00S <br />AET #95-1343 - Page 5 <br />other sites, we roughly estimate that firtcre settlements of the existing athletic field area (no <br />additional fill load imposed) would be on the order of 3" to 4" over the next 20 years. This <br />Settlement is esn=ted to be less than 1" in arras of thinner swamp deposits (such as Boring #2). <br />'therefore, these predicted long-term settlements would likely be differential.. <br />Regrading activities will result in some areas receiving additional load, which would result in <br />additional primary consolidation. As an example, if 3' of additional fill were placed in the <br />deeper swamp deposit areas, settlements associated with primary consolidation are estimated, to <br />be on the order of 9" to 1'. This illustrates the seWement sensitivity of regrading. Also, we <br />noted that a large stockpile currently exists at the site, which Inas likely resulted in local <br />consolidation of the pests. Therefore, future differential settlements may occur Veen the land <br />under the current stockpile versus the surrounding unloaded land. <br />Surface Stabili <br />The upper fill soils are anticipated to be relatively unstable under dymanic traffic loads. This <br />would be a primary concern in the parking lot area. The extent of instability is Lely a function <br />of the amount of peat and organic clay intermixing, the depth at which these soils are <br />mrermlxed, and the depth to the ground water table. <br />D <br />For the most part, the on-site soil profile has moderate drainage properties. An exCCption may <br />be where clay soils are present (such as at Boring #1) which can perch ground water if the clay <br />has horizontal continuity. Also, the fine grained silty sands have the ability to "hold" a high <br />water content. <br />Frost Sins tibility <br />The upper soils within the freezing zone are moderately high in frost susceptibility. The shallow <br />ground water level and the potential for the on-site soils to allow capillary rise dan result m ice <br />lense formation, which can greatly exaggerate frost heaving. <br />