04/30/2008 Env Bd Packet - Laserfiche WebLink

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• • Landscaping There is no indication of what types of seed will be used on infiltration, swale and pond areas. Attachment 3 does indicate seeding timing to meet NPDES requirements. However, all seeded areas within pond, wetland, swale, and infiltration pond sites should use the City Native Seed Specification. Additional screening with the use of shrubs and hardwood trees should be used on the top of the NURP adjacent to the houses to the North. Surface Water Design Infiltration must be designed to at least meet a one -half inch rain fall event. An infiltration pond is indicated on the NW side of the western most proposed cul -de -sac. There is also an infiltration area indicated in Outlot B (Dupont Avenue) I would think there would be more opportunity to increase the infiltration capacity of the project by further utilizing Dupont Avenue with a series of infiltration areas. This might help to retain some of the water volumes lost to NURP. Storm water piping from the NURP on the North side might go into a series of infiltration ponds along Dupont before it gets to the natural swale on the East side. There is no correspondence that we have received at this time on RCWD comments for the proposed plan. The same could be done with the water leaving the NURP's in the Commercial area. This type of "Treatment Train" would do more to conserve the water resource and filter the end product leaving the site. Access to all surface water treatment areas should be shown. There is a "water Garden shown on the plan on the East sides of lots 1, 2 and 3 Block 4. I would suggest the use of ECS in this area to mitigate the "wet and mushy" concerns of post project property owners. A design should be submitted for this water garden. A management plan should be written to address the maintenance and preservation of all surface water features, and planted areas. A contractor /ecologist specializing in the establishment and maintenance of native plants should be retained by a homeowners association and budgeted dollars put aside for future maintenance. Yearly maintenance plans should be submitted to the City for approval. A Conservation Easement/should be set up over all wetlands, buffer areas, infiltration and swale areas. Conservation Easement should cover 20 feet from the backs of the houses in Blk 5 that are adjacent to the wetland. Signs should be placed at all conservation easement areas denoting Easement presence, no mow, no fill, no alteration. A Natural Resource Brochure should be written and handed out to all new home owners describing the Conservation easements. NPDES A Storm Water Pollution Prevention Plan (SWPPP) should be submitted indicating detailed conformance to NPDES. This plan must be submitted to and approved by the City of Lino Lakes. This plan must show silt fence locations, 50 foot rock entrances, trash and cement truck clean areas. The SWPPP should reiterate the seed areas, type of seed and timing issues. A designated place on the site must be indicated on the plan where the SWPPP and inspection sheets will be maintained. Storm sewer inlets should have debris /sediment collection devices installed such as InfraSafe