05-25-1999 Council Agenda - Laserfiche WebLink

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Minnesota Department of Natural Resources Metro Waters - 1200 Warner Road, St. Paul, MN 55106 -6793 Telephone: (651) 772 -7910 Fax: (651) 772 -7977 February 10, 1999 Plowe Engineering c/o Mr. Craig Schlichting 9180 Lexington Avenue Northeast Circle Pines, MN 55014 RE: Twin Lake Pines Preliminary Plat, Twin Lake (62 -39P), City of Little Canada, Ramsey County Dear Mr. Schlichting: Thank you for submitting (received January 22, 1999) the preliminary plat (not dated) for the Twin Lake Pines subdivision located in the southwest quarter of Section 32, Township 30 North, Range 22 West, Ramsey County, to the DNR for review. The proposed plat contains part of DNR Protected Water, Twin Lake (62 -39P). Twin Lake is well known for its excellent water quality, which is due, in part, to the fact that the watershed is relatively undeveloped. There can be little doubt that the excellent water quality of Twin Lake will be used to sell the lots within the proposed subdivision. We strongly recommend that all reasonable means be used to preserving the excellent water quality of Twin Lake for the future homeowners in Twin Lake Pines, even if these measures do not follow the "safe," traditional methods of subdivision development. In particular, we recommend that the following measures be considered for use in preserving the excellent water quality in Twin Lake: The biggest threat to the water quality of Twin Lake is non -point source pollution from stormsewers. If possible, no new stormsewers should be constructed that directly, or indirectly, lead to Twin Lake. If it is necessary to route stormwater to Twin Lake, then the stormwater should be routed through wide, shallow ditches that are lined with long, native grasses that are cut only once a year. The vegetation in the ditches should be chosen for its ability to prevent erosion, increase infiltration, and remove particles from the stormwater. Stormwater should be stored for as long as possible in the proposed detention pond and adjacent wetland. Reducing the rate, at which stormwater flows to Twin Lake will not preserve water quality. The amount of stormwater entering Twin Lake should be reduced by reducing the amount of impervious surface (concrete, asphalt, and roofs) coverage within the development. Infiltration should be encouraged using methods that will be discussed at an upcoming conference at the Earle Brown Center of the University of Minnesota (see enclosed brochure). DNR information: 651- 296 -6157 Page 89 An Equal Opportunity Employer Who Values Diversity 651 -296 -5484 • 1 -800- 657 -3929 rrimeu on Recycled Paper Containing a V Minimum of 10% Post-Consumer Waste