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CMP Part 3A. Environmental Protection Plan <br /> Vegetated buffers, green strips adjacent to hard surfaces, permeable pavements that incorporate runoff <br /> treatment features, and rain gardens are just some of the additional tools available for supplementing <br /> runoff management. <br /> Nutrient management technologies such as NURP ponds or alum treatments will give Orono an added <br /> tool to manage runoff from rural densities, but Orono will not rely solely on man-made systems for <br /> preserving water quality. <br /> ORONO'S NATURAL RESOURCES <br /> Soils <br /> Orono's land forms are highly varied as the result of four separate glacial scourings. Surface <br /> features include islands, peninsulas, narrow land bridges, the lakes, bays and marshes, and a few <br /> shallow outwash basins. The highest elevations range from about 1060 feet above mean sea level <br /> in the northern part of the City down to the normal water level of Lake Minnetonka at elevation <br /> 929.4 MSL. <br /> The soils in the City of Orono (Map 3A-3)originated from drift materials deposited by meltwaters <br /> of the glaciers.Generally,the soil types consist primarily of clay and loam materials on the uplands <br /> and organic, wet materials in the lowland areas. Consequently, the ability of each soil type to <br /> adequately accommodate development varies considerably in Orono. Careful examination of each <br /> site is needed to determine the most appropriate land use for individual properties. <br /> Map 3A-3 references 7 different classes of soils. These classes are: <br /> Group A soils have a high infiltration rate and low runoff. These soils consist of deep, well <br /> drained sands or gravelly sands and have a high rate of water transmission. <br /> Group B soils have a moderate infiltration rate. This group consists chiefly of deep well drained <br /> soils with a moderately fine to moderately coarse texture and a moderate rate of water <br /> transmission. <br /> Group C soils have a slow infiltration rate. This group consists of soils with a layer that impedes <br /> the downward movement of water or fine textured soils and a slow rate of water transmission. <br /> Group D soils have a very slow infiltration rate and high runoff potential. This group is <br /> composed of clays that have a high shrink-swell potential, soils with a high water table, soils that <br /> have a claypan or clay layer at or near the surface, and soils that are shallow over nearly <br /> impervious material. These soils have a very slow rate of water transmission. <br /> If a soil is placed in group D because of a high water table it may be assigned to a dual <br /> hydrologic group: A/D, B/D, or C/D. The first letter of the pair represents the soil's group if <br /> drained and the D represents the natural condition. <br /> Orono's native vegetation is primarily woodland interspersed with localized areas of wet <br /> City of Orono Community Management Plan 2020-2040 Part 3A, Page 7 <br />