10/25/2000 Env Bd Packet - Laserfiche WebLink

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3. Project design should attempt to maximize infiltration of storm water on the site and reduce runoff into lakes and naturally occurring wetlands. When runoff into water bodies is unavoidable, storm water should be directed over a vegetated surface via broad swales. The design should attempt to maximize the surface area over which the water flows. The total linear distance of this storm water treatment train should be at least 100 feet between the storm water detention pond and the destination (ditch, lake, wetland). 4. Before spreading topsoil, the board recommends tilling the soil 8" to 10" deep to maximize the successful establishment of landscaping and minimization of surface runoff due to soil compaction during construction. 5. When restoring vegetation to the site, we recommend use of native materials or other plants that require little irrigation or nutrient addition. Use of exotic, invasive species is strongly discouraged. (Eg. European buckthorn, Norway maple) See City Environmental Coordinator for lists of recommended and non - recommended species. AGENDA ITEM STAFF ORIGINATOR: Marty Asleson DATE: September 22, 1999 TOPIC: Highland Meadows BACKGROUND: Please refer to the development background memorandum from City Planner Jeff Smyser. The Environmental Board did not previously review this project. Wetland mitigation is occurring on a parcel to the North and West of Lino Lakes Elementary. The Rice Creek Watershed District has issued a wetland permit. have walked the site with the developers engineering representative. To the drainage and grading plan are not all illustrated. For instance, the existing ditch on the SE side of the development will be filled. Water from the NW part of the development appears to be part of the Marshan Lake Subwatershed District, and water from the South and East part of the Development appears to be in the George Watch Subwatershed District. Water collected by storm events on the south side of the development will drain into an existing pond on south side of the development (not in the development). Please see the description for GWLNC and GWLNW on attached "Watershed Data" sheets from the Local Water Management Plan. Pond outlets on ponds 1 and 3 are designed 2 -3 feet below the normal high 1- year water level. Water from a normal rainfall would evacuate to the next downstream level. I have suggested that where possible, buffer areas be established and planted with native materials to try to capture back yard runoff. The City could also • Page 3