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Mr. Thomas Paschke August 31, 1999 Page 2 2. Lake McCarrons does not have a FEMA designated floodplain. However, any structures that are constructed on the Hanson Property should have lowest levels that are well above the 100-year flood elevation that has been used by the City of Roseville. In addition, structures should be constructed in accordance with the floodplain regulations of the City of Roseville and the Ramsey-Washington Metro Watershed District. . 3 It is good to see that the Hanson subdivision will not result in an increase in the amount of stormwater that will enter Lake McCarrons through storms ewers. Stormsewers channel pollution directly to a lake, or to sediment ponds that normally remove only a fraction of the pollutants from the water. Storms ewers also prevent rainwater ITom infiltrating into the ground. Whenever possible runoff should be routed through wide, shallow swales that are lined with native vegetation and mowed only once a year. Properly designed swales will allow water to infiltrate and vegetation within the swales will reduce the pollutants in the water. 4. As you pointed out in the cover letter for this plan, Lake McCarrons has a shoreland management classification of general development and shoreland that extends 1000 feet from the lake. The Hanson property is clearly within the shoreland of Lake McCarrons and the development of the lots must comply with the Shoreland Management Ordinance of the City ofRoseville. A review of the Hanson Plat reveals the following items: A. It is good to see that the lots within the Hanson Plat will meet the minimum area and width requirements listed within Section 18.040.2 of the Roseville Ordinance. It is also good to see that the structures that will be constructed on the lots will be located outside of the setback distance of Lake McCarrons. B. Steep slopes exist on the Hanson Property. Therefore, stairs or chairlifts should be used to achieve access to and from the lake in accordance with Section 18.050.4 of the Roseville Shoreland Ordinapce. C. Grading of the steep slopes should be minimized to reduce erosion. If construction must be done on the steep slopes, then the soil should be tested to identify possible erodible soils. Special Conditions should be attached to grading permits to protect the slopes and Lake McCarrons from erosion as required by Section 18.050.6 of the Roseville Shoreiand Ordinance. D. SectiQn 18.050.6 of the Roseville Shoreland Ordinance states that when vegetation is removed, the visibility of the house should not increase ITom the Lake. Visibility can also be further reduced by the use of color, or by planting additional trees on the lot. E. While vegetation may be removed for the construction of structures and parking areas, the intensive removal of vegetation is not allowed within the 37.5' shoreland impact zone or on steep slopes by Sections 18.091.1 and 19.091.2 of the City of Roseville Shoreland Ordinance. 5. Erosion controls for these lots should be meticulously maintained in order to protect water quality and property values. These erosion controls should be installed in accordance with "Ramsey Countv Erosion and Sediment Control Handbook" Ramsey Conservation District, October 1989. 6. When structures are constructed on these properties, the contractors should be told that a DNR Appropriation Permit will be needed for construction dewatering of more than 10,000 gallons per day, or one million gallons per year. It typically takes five (5) days for a permit for less than fifty (50) million gallons to be issued.