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L:- l-A m J Bonestroo Rosene Anderllk& Ivll Associates Engineers & Architects 2335 West Highway 36 • St. Paul, MN 55113 Office; 651-636-4600 • Fax: 65I-636-I3II www.bonestroo.com September 13,200S Mike GafTron Planning Director City of Orono Post Oflice Box 66 Ciystal Bay, MN 55323 Glendale Cove (177 Glendale Drivc/190 Willow Drive North) File No. 000139-05000-0 Plat No. 05-3131 Dear Mike; We have reviewed the revised preliminat^* plat and revised preliminary grading and drainage plans dated 9-8- OS for the pn^aed 10-lot residential subdivision. It appeals that the subdivision will now consist of an outlot, 8 new homes, one existing home and a lot created for die existing church. The site is located in the southeast quadrant of the intersection of Glendale Drive and Willow Drive North. We have the following comments in regards to engineering matters. 1. Access/Streets: A geotechnical report, R-value recommendation and pavement design should be submitted for review and approval. Final plans should include all applic^le standard details for street construction. All driveway grades shall be 10% or less. 2. Grading and Erosion Control: Final plans should include a Storm Water Pollution Prevention Plan in accordance with Minnesota Pollution Control Association rules. The grading plan should be consistent and show swales centered on common lot lines between homes as shown between Lots 4 and 5. The grading plans should provide 2-feet of fieeboard between the high water levels of any pond or wetland and the lowest expos^ opening to any home adjacent to the pond or wetland. This will require raising the proposed walkout elevations to at least 996.1 for Lots 8,9, and 10. The street elevations proposed along the church side across from Lots 8 and 9 will dam water on the church property. The plans should be revised to include storm sewer or the street grades should be revised. The plans should also include wetland mitigation information for the proposed wetland impacts. 3. Sanitary Scwer/Water Main: Final plans should include a detailed sanitary sewer design. Plan and profile views should be provided for ali proposed sanitary sewer improvements. Tlie ability to obtain municipal water from Long Lake should be explored. If municipal water is available final plans should include a detailed water main design including plan and profile views over all improvements. 4. Storm Scwcr/Drainage: Drainage area maps and drainage calculations should be submitted for review and approval. Plans should be submitted to Minnehaha Creek Watershed District for review and approval. Final plans should include storm sewer calculations and detailed storm sewer design including plan and profile views of all proposed storm sewer improvements. The fuial storm water pond design shall meet NURP standards. 5. Plat: The final plat should provide drainage and utility easements 10-feet wide along all exterior lot lines and 5-feet wide along all interior lot lines. Drainage easements should be provided over all ponding areas, wetlands and drainage ways. 6. Ffnancial Guarantee: When the final plans are completed we will prepare a cost estimate for the site St Paul. St. Cloud. Rochester, MN • Milwaukee, Wl • Chicago, IL ArrinMtIra Ac U mVCW** OpM'tunKy Cm«>l«|rw and Owndd