pf_02726 - Laserfiche WebLink

Home

, , .. The Board commended the school district for the proposed treatment of on-site run-off and encouraged the district to provide treatment for off-site drainage wherever feasibly possible. .. The Board recognizes the importance of strict erosion and sediment control during construction and urged Roseville to carefully control construction to minimize erosion. The Board suggested that this development be reviewed with the Ramsey Soil and Water Conservation District to utilize their expertise in this area. .. The Board emphasized the need to design the site drainage to protect the existing wetlands. Protection of existing wetlands was considered a must. .. The Board recognized that many details of the stormwater plan have yet to be finalized. The Board emphasized the need to resolve all the stormwater details prior to construction. Site Grading The existing site topography is very hilly. The low elevation of the site, adjacent to Wetland Basin 5 is 872' above mean sea level. The high point, near the intersection of Lake Owasso Boulevard and Western Avenue, is approximately 950' above sea level. Many of the proposed home sites are perched high above the existing wetlands and are proposed to be constructed on steep slopes, Existing site vegetation is varied-some areas heavily wooded while others are relatively open. During preliminary design, the school district has attempted to follow the existing topography whenever possible. This effort not only minimizes construction cost, but makes it possible to leave in tact a number of the site's natural features, While the proposed grading plan follows these guidelines to a great extent, it may be possible in some areas to adjust roadway grades to further reduce the amount of disturbed area. Most notably, this could be accomplished in the second and third cul-de-sacs south of the proposed drive and west of Western Avenue. These cul-de-sacs look over Wetland Basin 3. By lowering the elevation of the cul-de- sac, it may be possible to preserve more of the existing vegetation while still providing access. This may require, however, changes to the proposed utility systems, While silt fences have been proposed on the preliminary grading plans, it is suggested that construction plans be developed in accordance with the guidelines outlined in the Ramsey Soil and Water Conservation District erosion control manual. Such guidelines may suggest the construction of temporary siltation basins and additional erosion control during construction. Because of the granular nature of the soils on site and steep slopes, this site is very prone to construction erosion, Provisions should be made to provide a quick vegetative cover, especially in those areas adjacent to wetlands or in future build-out phases. 3. The Planning Commission, at the February 8,1995 meeting, unanimously 12