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, r � �� /� �11�' � ! � � ��b. - CITY of URONO � � ti �� G'� RESOLUTION OF THE CITY COUNCIL . �9kES�I04�' NO. ' �'� �' � • � . Site Group 7". The soils in Group 7 have "moderate limitations for residential and � commercial development tiyith pzrblic setiver systems where slopes are less than 12%. In areas where slopes are more than 12%, these soils generally have severe limitations for commercial and residential developnient because of the high cost of installing z�tilities and grading streets and building sites. P�•oper design of buildings, site planning, and minimal gf•adingredzcce erosion and sedimentation. Where slopes are more than 18% these soils ar�e better szcited to uses that enhance the natzrral beaarty of the area than to most other uses". The proposed development has been designed with these limitations in mind.It is also noted that the property does not meet the slope criteria for being considered as a bluff area under the Shoreland regulations, and is not subject to bluff impact zone limitations. The following aspects of the Development are intended to minimize or eliminate erosion and stormwater runoff water quality concerns: a. A majority of the slopes in excess of 18% on Lots 2 and 3 will not be disturbed by . grading and will have ,existing vegetation retained. These sloped areas� will be protected from excess runoff by a swale which will direct runoff to the proposed retention pond on Lot 1 abo�-e the southeasterly ravine.Easements and covenants will be put in place to ensure the s�vale will be retained and maintained on a permanent basis. b. The proposed retention pond on Lot 1 will result in a decrease of the runoff flow rates within the southeast ravine.Due to the steep gradient of the existing ravine,the watershed area tributary to this ravine has been reduced significantly and redirected to the northerly stormwater pond, thereby decreasing the runoff rates and volumes reaching the southeast ravine to a level lower than pre-development conditions. The pond in Lot 1 will also ser��e as a water quality pond, meeting NURP standards for sediment and nutrient remo��als prior to discharge to the ravine. Also, because the ' � ' southeast ravine has steep bank slopes, the protected area where no'grading is allowed will encompass the entire ravine area within Lot 2. c. In order to eliminate disturbance of the steeper slopes on Lots 2 and 3, installation of sanitary sewer alon�the common lot line as well as��ithin V4%ildhurst Trail will be via directional borin� methods to avoid open cuts which would potentially affect slope stability. • . . Page 3 of 8