05-15-2006 Planning Commission Packet

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. �� , � �Bonestroo Mem o 0 Rosene Anderlik& �Associates Englnccrs 6 Rrchltect■ Project Name: Haugen Residence Review, 3320 Fox Client: City of Orono Street ` File No: 139-06-000 To: Melanie Curtis, City Planner Date: May 11, 2006 From: John Smyth, C.W.D. Re: Buffer Ordinance Compliance Remarks: The proposed project involves the addition of a pool to the lot at 3320 Fox Street. Due to the grading for the pool disturbing more then 50 cubic yards, the portion of the disturbance draining to the wetland, and the net increase of impervious surtace the site is subject to the Cities Wetland Buffer ordinance. The wetland on this property is a long swale that flows from north to south down to Lake Minnetonka. Due to the wetlands drainage to Lake Minnetonka which is a recreational resource the wetland was classified by the • watershed district as preserve. Under the City's wetland ordinance this classification requires the widest buffer width, 50 ft, of native vegetation which provides valuable filtering and removal of nutrients from the proposed lawn area and impervious surtaces prior to reaching to the wetland as well as the lake. Currently there is an existing home, driveway, and septic sites approved on a previous permit. The existing structures do not allow the full 50 feet of buffer. Due to the existing structures not allowing the 50 foot buffer Section 78-1608 (Buffer Flexibility) of the Wetland Ordinance allows alternative methods of wetland protection. The applicant is also seeking alternatives to the 50 feet of buffer in order to maintain some additional yard space and has modified the buffer from 50 feet to 26 feet for the middle wetland and from 50 to 20 feet for the wetland near the lake. The applicant proposes to provide the following: 1. A proposed vegetated treatment swale is proposed for the drainage from the pool impervious 2. Wet Meadow filtration basin at the end of the wetland swale prior to it discharging to the lake. The applicant has shown a wiliness and has provided some alternative protection measure for the wetland, however it is recommended that the applicant be required to provide additional protection measures such as water gardens and/or promoting infiltration and filtration within and adjacent to the existing wetland. It is recommended that we meet with the applicant and his consultants to discuss alternative protection measure that will mitigate the loss of the buffer. Bonestroo,Rosene,Anderlik and Associafes,lnc. www.bonestroo.com �St.Paul Office: 0 Milwaukee Offlce: ❑Rochester Office: �Wlllmar Offlce: ❑St.Cloud Office: ❑Grayslake Offlce: 2335 West Hlghway 36 1516 West Mequon Road 112 7�h Streel NE 205 5th Slreet SW 3721 23`°Street S 888 East Belvldere Road St.Paul,MN 55113 Mequon,WI 53092 Rxhesler,MN 55906 Willmar,MN 56201 St.Cloud,MN 56301 Grayslake,IL 60030 Phone:651-636-4800 Phone:262-241-4468 Phone:507-282-2100 Phone:320-214-9557 Phone:320-251-0553 Phone:847-548-6774 Fax:651-636-1311 Fax:262-241-4901 Fax:507-282-3100 Fax:320-214-9458 Fax:320-251-6252 Fax:847-548-6979