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Record of Decision — Riverstone Addition Environmental Assessment Worksheet <br />Response <br />The outlet was mentioned in the current EAW because it was discussed in an EAW prepared in 2005 for <br />the Sommerset Station Subdivision. Sommerset Station would have covered 190 acres, including the <br />Riverstone Addition property, but Sommerset Station did not advance to construction. The Sommerset <br />Station EAW assumed that any outlet constructed would be above the OHW and the 100-year flood <br />elevation of Itasca Lake. <br />The culvert under Alpine Drive acts an emergency overflow outlet from Itasca Lake. The control <br />elevation in the culvert is 870.4 feet, which is higher than the 1% frequency flood elevation. Water from <br />the emergency overflow would flow through Wetland 2, the Riverstone Addition ponding system, and <br />continue draining southeast. The emergency overflow outlet will not affect Lake Itasca, nearby wetlands, <br />or the proposed project design. Lowest floor elevations of homes on the project will be at least 3 feet <br />above the highest anticipated groundwater table and 2 feet above the 100-year flood elevation, or 1 foot <br />above the emergency overflow, whichever is greater. <br />Surface/Groundwater Appropriation <br />We recommend that ground water conservation measures, such as stormwater reuse for irrigation and use <br />of drought tolerant native plants for landscaping, be incorporated into the development design. <br />Response <br />Comment noted. <br />Fish and Wildlife <br />The Blanding's turtle flyer and fact sheet should be provided to all contractors working in the area (see <br />Appendix D of EAW). If Blanding's turtles are observed to be in danger, they should be moved out of <br />harm's way by hand. State rules prohibit the destruction of threatened or endangered species, except <br />under certain prescribed conditions. <br />Response <br />Comment noted. <br />Minnesota Department of Transportation Comments <br />Permits and Approvals <br />Work within or affecting MnDOT right of way requires a permit. Permit forms are available from <br />MnDOT's utility website atlwww.dot.statc.mn.us/mctro/mauitcnancc/rcrmits.html!and application <br />submission options are listed in the comment letter. <br />Response <br />Comment noted. The project is not expected to involve construction on, direct access to, or effects on <br />MnDOT right of way. <br />3 <br />