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� May 18, 2007 l�s �� William and Louise Loomis 1410 Judith Ave Shoreview, Minnesota 55126 RE: Variance Rain Garden requirement Dear Mr. and Mrs. Loemis: • k. We have had an opportunity to review the lot and proposed improvements at 1410 Judith Ave to determine the size for the rain garden required as a result of your impervious area variance. From the information you provided the additional hard surface is 250 square feet more than what is allowed by code. I have enclosed a copy of "Rain Gardens: A how-to-manual for homeowners" this resource �vill help you in the construction of your rain garden. It was originally written for Wisconsin, but the information applies in Minnesota. Here is some guidance for the design of your rain garden: • Page 9, Table 1: we do not have soils information on your site, as a result I assumed that your soil. was clayey, so to determine the size of a 6 inch deep rain garden we multiplied 250 sf by 0.32 to get 80 sf. Your rain garden should be at least 80 sf in area. • Page 9 also discusses a simple soils test. I recommend that you conduct this test to better assist with sizing of this garden. Simply dig a hole and fi11 it with water, if the water disappears within 24 hours, the rain garden will be successful in your yard. • If you have silty or sandy soils, the size of this garden can be reduced. Page 9 also has so�ne guidance on how to determine if the type of soil. A silty soil rain garden for your yard would need to be 62.5 sf, a sandy soil one would need to be 37.5 sf. I have assumed clayey because I have no other information. If you have soil borings, please provide it to us with your building permit to support any proposed change in area for the rain garden. • See page 11-15 for construction infonnation for the rain garden. Be very careful to not compact the soils by driving heavy machinery on the bottom of the garden. • We will require that the location of the proposed rain garden be shown on the lot when you come in for a building permit. I am available to meet with you on site if you have any questions. If you need design or funding assistance, I have attached a brochure for Ramsey Conseivation District's cost share program. If you City Engineer " Phone: 651-792-7042 deb.bloom(a�ci.roseville.mn.us CC: Bryan Lloyd, Gerry Proulx, Dean Findell 2660 Civic Center Drive ❖ Rose�-ille, i�iinnesota 5�ll3 651-792-ROSE ❖ TDD 651-792-7399 ❖ www.ci.roseville.mn.us Rec��cled paper - 30% post-consumer content