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PHONE NO. DSTATE OF EPARTMENT OF NATURAL RESOURCES 612/296-7523 1200 Warner Rd., St. Paul, MN. 55106 FILENO August 22, 1986 Ms. Anne Norris CITY OF RAMSEY 15153 Nowthen Boulevard N.W. Ramsey, Minnesota 55303 RE: STANHOPE RIVER HILLS PRELIMINARY PLAT Dear Ms. Norris: I have reviewed the preliminary plat for the Stanhope River Hills which we received on July 16, 1986, including a field inspection of the site on August 1, 1986. I've also reviewed the preliminary street profiles and preliminary plat, as revised, received on August 19, 1986. Based on this review, I have the following comments: The plat is entirely within the Rum River Scenic land use district, entailing a number of zoning standards as prescribed by the City's Scenic River Ordinance (#81-4). The proposed location of Oneida Street and 153rd Lane NW will involve work at and beyond the bluff line. Specifically, the corner of these two streets should be relocated or a curve be designed so that the edge of the disturbed area is no less than 30 feet from the bluff line. ("Disturbed area" means road surface and adjoining shoulders, ditches, etc. where vegetation removal and grading will occur.) The street profile accentuates the severity of the slope at this location. Additionally, the proposed stormsewer poses several potential problems. The outfall will be on the floodplain with no provision for conveyance of stormwater to the river or erosion control. Due to the extreme drop in the pipe, erosion at the outfall is very likely to occur. The plans should be revised to include a stilling basin with an energy dissipator and some form of conveyance (swale or pipe) to the Rum River. e Lots ll, 15, & 16 are severely limited by the bluff. Access to the Lot 16 is severely impeded due to slope severity and available building area is within the flood plain. Section 170.078.2 of the Scenic River Ordinance restricts development on the slopes greater than 12 percent. I have serious reservations as to whether a house, sewage system, and well can be successfully placed on these lots without severe impacts to the slope by erosion and visually to the River. I strongly recommend re-design of Oneida Street and 153rd Lane NW as recommended above and revision of lots to allow enough area free of limiting slopes, etc. for home construction. I should point out that this area is likely to develop with large homes which typically involve greater disturbed areas for yard, garage, sewage system, etc.. The stormwater outfalls from 155th Lane NW and Juniper Ridge present similar drainage and erosion problems. I do not believe that unconfined drainage "to daylight" as stated on the plans is sufficient stormwater management. Soils in the area are very unstable and are susceptible to erosion near the river. Confined discharge points to the river are essential. Any work which extends below the top of the river bank requires a DNR permit. AN EQUAL OPPORTUNITY EMPLOYER Iff"