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July 15, 2004 Mr. Brian Carey United Properties 3500 W 80th Street Bloomington, Minnesota 55431 RE: Applewood Park Rain Garden Dear Brian: We wanted to address your letter dated June 28, 2004 regarding the redesigned infiltration area in the north park of the Applewood Pointe development. After site visits and a review of the proposed alternate, we are unable to support the proposed design change for this infiltration area. We wanted to share our reasons for staying with the approved rain garden design. It We have always looked at the storm water improvements included in this development as amenities for the neighborhood you are building. That is how we approached the reconstruction of the Arona Pond, that is how we look at the rain garden in the north park. The garden will be planted with a variety of prairie plant species, which will add to the beauty of the park. It will also attract wildlife, birds, butterflies, and dragonflies. In contrast, the proposed sump does not have the same benefits, in fact has an 18" plastic pipe sticking up out of the ground. Also, many of these plants require a moist soil to grow. lfthe alternate design is constructed, the area would likely be sod. It The entire garden will be landscaped with prairie plants. One of the benefits of a rain garden is that the phosphorus in the runoff provides nutrients to the plants. Many plants need phosphorus to grow, the garden removes phosphorus from the storm water, preventing it from being pushed further down stream into Lake Johanna. It This is not an open pond, the rain garden is designed to retain the water for a 0.34 inch rain. A rain event greater than 0.34 inches will over flow into the catch basin that is located to the south of the garden. The soils on this site are ideal for a rain garden. The approved design is for a 140 square feet (14 x 10 foot) area to have water sitting in it for no more than 72 hours. Standing water will be no more than 12 inches at its deepest point. . Also, the garden is located on the south side of the pathway. As designed, the water will not flood the pathway. Once the water reaches the elevation of the catch basin it will drain into the storm sewer and down to the pond on the south side of the site. 2660 Civic Center Drive .:. Roseville .:. Minnesota .:. 55113 651-490-2200.:. TDD 651-490-2207 .:. www.ci.roseville.mn.us