08-15-1983 Planning Packet - Laserfiche WebLink

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st 2# 1983 766-767-768 m•V. ^ h this property, rown Road and lopment or other :ss remedial will have to I turn will have >rdinator, Minnesota District and perhaps, L983 attached. jubwatershed Lake and thence 5W generally Dr the current stage ailed review at ricts making a total d by MCWD. tlet creek to Long earn from Dickey ely 2/3 of the emain undeveloped on, quantity or I and developed part of the Reber :ed a complete j drainage system property which is Donalds' site is from an extremely Kenny's Market in and may need extensive ditches and storm harging it to the ivides with two . >- A Issue 4 - Drainage Page 2 The western half of the Reber's property, most of the Wear property and a significant part of the adjacent Ringer property all surface drains into the highway ditch to a culvert in front of 2120 Wayzata Boulevard (Wear's office building), then under Wayzata Boulevard and around the back of the Long Lake industrial area to the outlet creek. The eastern half of Reber*s property drainsdirectly into the Minnesota Department of Transportation highway dirch, or a ditch alongside Brown Road, all .coming together at a MnDOl .ilvert on the northwest corner of Brown Road and Wayzata Boulevard. This crosses under the road, down the south side of Wayzata Boulevard, and then back under Wayzata Boulevard in the creek beside Kenny's. This is the most critical system on the Reber property, and it is also the system most affected by the current development plans. MnDot will be reviewing the capacity of their storm sewer system at this location. Most likely both MnDOT and MCWD, not to mention the City Engineer, will require a retention pond to eliminate any increase in quantity or velocity of discharge into this MnDOT culvert. This will have to be sized to accommodate the potential commercial development (hardcover) on all of the Reber's property that drains to this culvert, not just McDonalds. Because of topography, the only logical place for such a retention pond appears to be at the corner of Brown Road/Wayzata Boulevard, exactly where the proposed McDonalds' site is located. McDonalds' proposed site plan leaves no room for such a pond. Therefore, it seems likely that the proposed McDonalds’ Lot 4 will have to be enlarged north and west to make sufficient room for a retention pond. The exact size of the pond can be determined only by an engineering study. In addition to on-site planning and facilities like retention ponds, MnDOT, MCWD and/or the City of Long Lake may determine that the existing storm sewer system is overloaded to the point of needing additional capacity despite any retention on this site. In this case, a joint storm sewer feasibility study and improvement project would be necessary with both cities and the watershed district participating. This would involve the total watershed including properties in the City of Long Lake, not just the Reber property. There i' no maximum hardcover regulation for the B-1 zoning district. The proposed McDonalds' site plan indicates approximately 83% hardcover. This site alone if developed as proposed, would therefore add considerable volume of runoff to this drainage system. m 4 ■ •f- i . ; Issue 4 Page 3 Finally plan wo This sh roads a control RECOMME 1. Req cal LL- coir 2. Def acc 3. Def