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opY �RO �4 C Memorandum �Bonestroo __ _ __ __ _ 2335 Highway 36 W To: Melanie (urtis Projecr. 2550 Fox Street Date: 6/9/201I Sc. Paui,nH Ss�i] From: f ohn Smyth (lient: City or Orono Tel bil-6J6-4600 faz 651-636�Iill Ne: Wetland Buffer Ordinance Comphance file No: 139-I1000 wwwbonestroo.com Remarks: Gronberg and Assoicates, Inc has demonstrated that the water from the new proposed structure will drain to the southeast. This will require an upland buffer of 25 feet adjacent to the portion of the wetland that receives the drainage. A ezisting driveway crosses the buifer so a portion of the buf(er will exist on both sides of the driveway. Gronberg and Assoicates, Inc. has provided a drawing that accurately depicts the extent of the required buffer. Buffer Yegetation Requirements Most of the buffer is in a natural state and the ordinance only requires that it is preserved (see attached exhibit�. Only a small portion of the buffer contains turf. The portion of the buffer that is turf will need to have the turf removed and be restored to native vegetation. A written description of the proposed native seed mix to be seeded and method of site preparation and seeding should be provided to the firy for review and approval. According to the ordinance Div. 3 Sec. 18-1605 �3) the seed mix must contain at least 12 pounds (PLS) per acre oi native prairie grass seed and 5 pounds (PLS) per acre o( native wildFlower seed. The grass mixture must contain a minimum of four species while the wildflower mixture must contain a minimum of (ive species. Once the native vegetation is established the bufier area will not 6e allowed ro be mowed unless it is for maintenance after October I5. Recommendations It is recommended that if the application is approved it includes the condition that the applicant needs to meet the bu(fer vegetation requirement as discussed ia this memo. An escrow amount for $i,900 is recommended to cover the cost of buffer development if not completed by the applicant and compliance checks.