CCP 02-19-2002 - Laserfiche WebLink

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Gateway Business Center - Arden Hills. MN EAW September 2001 . On-site soils are relatively poor draining and, thus, surface water can be expected to perch in the excavation during times of wetter weather. Water should be . removed from within the excavations during construction, Based on the soils encountered, the ground water can be handled with conventional sump pumping. . On-site soils can become disturbed under construction traffic, especially if the soils are wet. If the soils become disturbed, they should be subcut to the underlying undisturbed soils, The subcut can then be dried and recompacted back into place, or they should be removed and replaced with drier imported fill. b. Describe the soils on the site, giving NRGS (SGS) classifications, if known. Discuss soil granularity and potential for groundwater contamination from wastes or chemicals spread or spilled onto the soils. Discuss any mitigation measures to prevent such contamination. The soils on the site and their NRCS classifications are as follows, aeeording to the RamseylWashington County Soil Survey: 860C Urban Land-Hayden-KingsIey Complex, 3-15% slope. Urban land consists of 90 percent of this complex and in undisturbed areas, the remainder consists of Hayden and Kingsley soils, The soil is well-drained, permeability is moderate and runoff is rapid, This complex is well-suited to building site development. Erosion control is desirable both during and immediately following construction. Onsite investigation is reeommended to determine the potentials and limitations of this complex for any proposed use, 132B Hayden Fine Sandy Loam, 2- 6% slope. The soil is well-drained, permeability is moderate and surface runoff is slow. Good potential for building sites. . 132C Hayden Fine Sandy Loam, 6- 12% slope. The soil is well-drained, permeability is moderate and surface runoff is rapid, Well-suited as a building site, 132D Hayden Fine Sandy Loam, 12-25% slopes. The soil is well-drained, permeability is moderate and surfaee runoff is rapid to very rapid. Fair potential for building sites. Erosion should be controlled both during and immediately following construeti on. The soil boring report states that the generalized soil profile consists of 1-14 feet of fill, topsoil and swamp deposits underlain by glaeial till and alluvial soils. The fill soils consist primarily of sand and silty sand, but some clayey soils are present. The topsoil consists primarily of silty sand with lesser amounts of lean clay and clayey sand. The topsoil thickness is typieally 1-2 feet. Swamp deposits were encountered at . Page 20