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Home My WebLink About2007-03-14 MSCWMO Ltr to OPHOak Park Hei 1 3 80 WEST FRONTAGE ROAD, H I G H W A Y 3 6 S T I L L W A T E R M I N N E S T 0 A 5 5 0 8 2 Phone 651 .275.1 136 x 2 2 f a x 6 5 1 2 7 5 1 2 5 4 w w w m s c w m o r Hei `t Baytown YWP MSCW March 14, 2007 We-t -- Lakeland T. to "land Eric Johnson, Administrator ;L. tan" Cit of Oak Park Hei I L 14168 Oak Park Blvd. N p a ro PO Box 2007 Oak Park Hei MN 55082 RE: Goodwill, MSCWMO Review Comments Dear Mr. Johnson, St. I Beach Mary's The Middle St. Croix Watershed Mana Or (MSCWMO) received submittal items for the proposed Goodwill project, located within MSCWMO boundaries and in the cit of Oak Park Hei Minnesota. Accordin to the MSCWMO 2006 Watershed Mana Plan (WMP), an project undertakin g radin g , fillin or other land alteration activities which involve movement of earth or removal of ve on g reater than 10,000 s feet of land will be referred to the MSCWMO for full review (2006 WMP, Section 6.2.1). Because the proposed project q ualifies for full review under the 2006 WMP, the followin WMP Policies and Performance Standards appl WMP Section(s) Polic or Performance Standard Goodwill Project - Comments Direct dischar of stormwater to wetlands and Pro as submitted, is compliant with this 5.1.4, Polic Item I all other water bodies without water q ualit y polic treatment is prohibited. Sources of water pollution shall be identified Project, as submitted, is compliant with this throu the MSCWMO data collection pro polic Sources of water pollution for this site and corrected throu the application of BMPs. include erosion/sedimentation issues durin 5.1.4, Polic Item 2 construction, and increased impervious areas after construction is complete. BMPs will be applied based on other policies and performance standards of the MSCWMO. All h studies shall anal the 2-, 10- Project, as submitted, is compliant with this and 100- rainfall event, with the critical polic duration defined as that event causin either the hi water surface elevation or the lar 5.1.4, Polic Item 3 peak dischar in an area or both. An stud must use consistent methodolo for the pre- development and post-development land use conditions. The methodolo must be approved b MSCWMO. Middle St. Croix Watershed Mana Or Member Communities Afton, Ba Ba Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater, a West Lakeland March 14, 2007 Page 2 of 4 VAMP Section(s) Policy or Performance Standard Goodwill Project - Comments Newly developed or redeveloped areas will be Project, as submitted, is compliant with this limited to the predevelopment or existing rate of policy. HydroCAD report contains required runoff or to a rate within the capacity of information on flow and volume rates. downstream conveyance systems, whichever is less, and no increase in the volume or rate of 5.1.4, Policy Item 4 runoff from newly developed areas will occur in areas where natural outlets do not exist. In sub- areas of a landlocked watershed, development shall not increase the predevelopment volume or rate of discharge from the sub -area for the 10- year return period event. Runoff will be minimized through on -site Project., as submitted, is compliant with this 5.1.4, Policy Item 5 infiltration or prevented through reduction in policy. On -site infiltration practices meet impervious surfaces to the largest extent design standards. possible before detention ponds are used. Site design practices that may have only a minor Project, as submitted, is compliant with this negative impact on peak flow and volume, such policy. Recommend using native vegetation to 5.1.4, Policy Item 6 as the use of buffer strips along receiving waters the extent possible. and drainage swales, will be promoted to achieve compliance with the water quality performance standard. Applicants must secure any flowage easements Project, as submitted, is compliant with this that would be required to accommodate the policy, on the condition that all required 5.1.4, Policy Item 7 stormwater management facilities. These easements will be secured. easements will be granted up to the 100 -yr flood level. Applicants will provide the MSCWMO with Project, as submitted, is compliant with this 5.1.4, Policy Item 8 100 -year flood levels on the ponds, lakes, and policy. streams as parcels are developed. 5.1.4, Policy Item 9 The MSCWMO has adopted the Washington Project, as submitted, is compliant with this County Floodplain Regulations. (Appendix H). policy. 5.1.4, Performance Standard I See Appendix I for Design Standards for Project, as submitted, is compliant with this 5.2.4, Performance Standard 1 Structural Stormwater Management Measures. policy. On -site infiltration practices meet design standards. Enhanced volume runoff controls will be Project, as submitted, is compliant with this 5.1.4, Performance Standard 2 designed to retain the first 1 /2 inch of runoff for policy. Runoff volume standard has been met. all impervious areas plus 1/ inch of runoff for On -site infiltration practices meet design areas with compacted soils. standards. No increase in rate of runoff leaving the site Project, as submitted, is compliant with this 5.1.4, Performance Standard 3 from pre- development to post - development performance standard, based on submitted 5.2.4 Performance Standard 2 conditions generated by the 2 -, 10 -, and 100- HydroCAD rate calculations. year rainfall. A Stormwater Pollution Prevention Plan Project, as submitted, is compliant with this (S WPPP) that meets the National Pollutant performance standard. Discharge Elimination System (NPDES) 5.1.4, Performance Standard 4 requirements must be submitted to and approved 5.2.4, Performance Standard 3 by the MSCWMO for all projects undertaking grading, filling, or other land alteration activities which involve movement of earth or removal of vegetation on greater than 10,000 square feet of land (See Appendix J for NPDES requirements). Middle St. Croix Watershed Management Organization MEMBER COMMUNITIES; Afton, Bayport, Baytown Township, Lakeland, Lakeland Shores, Lake 5t, Croix Beach, Oak Park Heights, St. Mary's Point, Stillwater and West Lakeland Township March 14, 2007 Page 3 of 4 WMP Section(s) Policy or Performance Standard Goodwill Project — Comments Direct discharge of stormwater to wetlands and Project, as submitted, is compliant with this 5.1.4, Performance Standard 5 all other water bodies without water quality performance standard. treatment is prohibited. Predevelopment conditions shall assume "good Not applicable. hydrologic conditions" for appropriate land covers as identified in TR -55 or an equivalent methodology. The meanings of "hydrologic soil group" and "runoff curve number" are as determined in TR -55. However, when predevelopment land cover is cropland, rather than using TR--55 values for cropland, the following runoff curve numbers (RCN) shall be 5.1.4, Performance Standard 5 used. These curve numbers represent midrange values for soils under a good hydrologic condition where conservation practices are used and are selected to be protective of the resource waters. Hydrologic Soil Group RCN A 56 B 70 C 79 D 83 Conversion of high- permeability soils shall be Project, as submitted, is compliant with this avoided and these soils shall be targeted for performance standard. Any infiltration BMPs 5.1.4, Performance Standard 7 infiltration. used for this project must meet MSCWMO standards. Lowest floor elevations of structures built Project, as submitted, is compliant with this adjacent to stormwater ponds and other water performance standard. bodies must be a minimum of two feet above the 100 -year flood elevation and a minimum of two 5.1.4, Performance Standard 8 feet above the natural overflow of landlocked basins. The landowner or developer is required to provide MSCWMO with the location of the 100 -year flood elevation, natural overflow elevation, and lowe fl oor elevations. Buffer zones of unmowed natural vegetation Project, as submitted, is compliant with this shall be maintained or created upslope of performance standard. delineated wetland edges, ordinary high water 5.1.4, Performance Standard 9 elevation, or floodplain of all water bodies (wetlands, streams, lakes) in accordance with the Performance Standards relating to wetlands, Section 5.3.4. Detention facilities will be designed to attenuate Project, as submitted, is compliant with this 5.1.4, Performance Standard l0 peak flows and provide on -site infiltration in policy. On -site infiltration practices meet high - permeability soils, natural depressions, and design standards. swales. Middle St. Croix watershed Management Organization MEMBER COMMUNITIES: Afton, Bayport, Baytown Township, Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Heights, St. Mary's Point, Stillwater and west Lakeland Township March 14, 2007 Pa 4 of 4 WMP Section(s Polic or Performance Standard Goodwill Project - Comments The MSCWMO shall re proper erosion and Project, as submitted, is compliant with this sediment control throu the watershed to polic Compliance with other policies and prevent siltation and sedimentation of streams, performance standards relatin to erosion and lakes, wetlands, and other areas of the sediment control has been achieved (includin 5.2.4 Polic Item I watershed. 5.1.4, Performance Standard 1; 5.2.4, Performance Standard 1; 5.1.4, Performance Standard 2; 5.1.4, Performance Standard 4; 5.2.4, Performance Standard 3; 5.2.4 Polic Item 2 Both temporar (durin construction and Project, as submitted, is compliant with this permanent (lon erosion control will be polic Compliance with other policies and re q uired on newl developed or redeveloped performance standards relatin to erosion land in MSCWMO undertakin g radin g , fillin control has been achieved ( includin g 5.1.4, 5.2.4 Polic Item 2 or other land alteration activities which involve Performance Standard 1; 5.2.4, Performance movement of over 100 cubic y ards of earth or Standard 1 5.1.4, Performance Standard 2; removal of ve on g reater than 10,000 5.1.4, Performance Standard 4; 5.2.4, s feet* of land. Performance Standard 3; 5.2.4 Polic Item 1 The proposed project disturbs g reater than 10,000 s feet of land. Existin a activities will be exempt Not applicable. from the performance standards listed below. 5.2.4 Polic Item 3 MSCWMO will re buffers from waterbodies and support a BMPs. New a activities must conform to the performance standards listed below. 5.2.4 Performance Standard 4 Construction is prohibited on slopes g reater than Project, as submitted, is compliant with this 12 percent. performance standard. Buffer zones of unmoved natural ve Project, as submitted, is compliant with this shall be maintained or created upslope of performance standard. delineated wetland ed ordinar hi water 5.2.4 Performance Standard 5 elevation, or floodplain of all water bodies (wetlands, streams, lakes in accordance with the Performance Standards relatin to wetlands, Section 5.3.4. This project, as submitted, meets all Policies and Performance Standards contained within Section 5.0 of the MSCWMO WMP. The MSCWMO Board approved the project on March 8, 2007. Washin Conservation District staff is available for technical assistance to the landowner to ensure that the project desi and construction meets all MSCWMO Policies and Performance Standards. Feel free to contact this office at 651-275-1136 if y ou have an q uestions re these comments. Sincerel Pete Y n En Specialist, Washin Conservation District CC. Todd Erickson,, P.E., Folz, Freeman, Erickson, Inc., 5620 Memorial Ave N, Stillwater, MN 55082 Vicki Vandell, P.E., Folz, Freeman, Erickson, Inc., 5620 Memorial Ave N, Stillwater, MN 55082 Melissa Lewis, Administrator,, Middle St. Croix Watershed Mana Or Middle St. Croix Watershed Mana Organization MEMBER COMMUNITIES: Afton, Ba Ba Township, Lakeland, Lakeland Shores, Lake St. Croix Beach, Oak Park Hei St. Mar Point, Stillwater and West Lakeland Township