06-26-1995 Council Packet - Laserfiche WebLink

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R33. Cir/ of Long Like Wt»r Detgnrnn Basin$AV^t!ard: liiiVo 4. Long Lake Alum Treatment: E3 No V Physical Imoacts on Water Resources mi tke projea invoNa the physical or hydrologic dterahon ^ (diedging filling, stream diversion, oufiail smxcmre. diking, impoundt^m) of any surface water (lake, pond wehand. stream, drainage ditch)? [J Yes [] No. If yes. identify the water resource to be affected and describe: the alteration, including the construcnon process: volumes of dredged or fill material: area affeaed: length of stream diversion: water surface areaaffeaed:^^^ fluctuations in water surface elevations: spoils disposal sites: and proposed mitigation measures to minimize impacts. rnttnrj Roarf Vo fi w.*f Detenqop R.\«;in/Wetland: S yes The Drojec: involves ejcsvadon within an existing DNR protected stream and a juiMicnonal wedand. ^ approximately 600 foot section of the DNR ptoteaed stream will be extmvated Ibr the purpose ot cons^cting a rwo-ceil wet detention basin. The stream wUI be ^tered to the extent rtat it flows through a basin where the extended detemion time in the basin allows for nument and sedtment removal. The project does not restrirt flow or change any existing water levels. The basiiu will b^xcavated with backhoes or drag lines within a projea easement area of 3.53 acres. A tot^ ot 25,000 cu^c yards of soils wUl be excavated. Tlie spoU disposal site wUl be determmed by the contraaor. To minimize construaion related impacts, the projea wUl be construaed m January and February when there is no stream flow. a. b. c. peer Hill Road Wet Detenrion Basin/Wetlandl S ^es nie projea involves excavation within an existing DNR proteaed stream and a jumdictional wetland. An Mproximately 1100 foot section of the DNR proteaed stream will be excavated for the purpose of constructing a two-cell wet detention basin. The stream wUl be altered to the extent foat it flows through a basin where the extended detention time in the basin allows for nutrient and sedunent removal. The projea does not restria flow or change any existing water levels. The basins wUl be ^^vat^ with backhoes or drag lines wifoin a projea easement area of 12.08 acr«. A to^ yards of soils will be excavated and removed from the site. The spoil disposal site will b^etermmed by the contractor. To minimize construction related impacts, the projea will be construaed m December, January and February when there is no stream flow. 13 YesCifv nf T rno Lake Wet Detention Basins/Wetland: The projea involve.^ enlarging and deepening two existing sedimentation basins construa^ within 1) a drainage ditch for a 613 aae subwatershed and 2) the ouUet of a 20 acre subwatershed. The two basins discharge directly to Long Lake. Normal flows will be diverted through a 36-mch pipe trom basin one to basin two to further improve water quality treatment of the subwatershed tributary to basin one. Under high flow conditions, water will bypass basin two by flowing over an existmg ou e struemre out of basin one. The projea does not restria flows or change any existing water levels. 15^30^1 ■i»-EAW«AES»liw Page 10 of 24 5/24/95