10-19-1998 Planning Packet - Laserfiche WebLink

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^ I Bonestroo Rosene Anderlik & \\\\ Associates Engineers & Architects October M, 1998 Elizabeth VanZomeren City Planner/Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, MN 55323 Re: Stickncy Subdivision File No. 139-2426 Dear Liz: Bonestroo. ffcsene. Anaeriik t*nd Assoc>^tes inc ts tvi Affirmative Action Equal Opportunity Employer Principals Otto G Bonestroo. PE • Joseph C Anderlik PE • Marvin L Sofvala PE • Ptchard E Tu■rre^ PE • G'enn ff Cook. PE • PoPert G Schunichi PE • Jerry A Bourdon. P£ • Rooert W Rotene. PE and Susan M EPerlm C PA Senior Consu't.snts Associate Pr.f^cipals Howsarj A Sanford PE • keitn A Gordon. PE • RoLert R P/efferle. PE • Picna^d W Foster. PE • Oavid O Loskota ^E • Robert C Russek. Al A • Mark A Hanson. PE • Michael T Rautmann PE • Ted K F?eid. PE • Kenneth P Anderson PE • Mark R Rolfs PE • Sidney P VliJIiamson. PE. L S • Robert F Kotsmith • Agnes M Ring • Muharl P Rau PE • Al.'an Rick Schmtdr. PE Offices St Paul. Rochester. Wnimar and St Cloud MN • Milwaukee. W'l Uebsrfe WWW bonestroo com c We have reviewed the preliminary plat for the proposed two-lot subdivision for George Stickney. The site is located on Willow Drive South just south of 450 Willow Drive in the south half of Section 3. We have the following comments in regards to engineering matters. 1. Access' There currently is no well defined access to the site. Proposed access locations should provide adequate sight distance from the high point on Willow Drive located approximately 180- feet south of the site. It may be appropriate from a safety perspective to combine two driveways and have a shared access onto Lots i and 2. Maximum driveway grades should not exceed 10 percent. 2. Utilities: The existing grades may make it difficult to locate primary and alternate septic sites. City staff should review the proposed septic locations. 3. Grading: A grading and erosion control plan for the entire site should be submitted for review. Erosion control measures should be in place prior to any grading. 4. Drainage: The draft version of the City ’s Comprehensive Storm Water Management Plan (SWMP) shows that the site drains both east and west. The westerly portion of the site drains westerly to an existing wetland identified a*' FR-P19. The remainder of the site drains easterly to an existing wetland identified as TL-Pl 1. According to current Minnehaha Creek Watershed District (MCWD) rules, subdivisions larger than 2 acres require the construction of a NURP pond to treat stormwater from the site, i'his subdivision is larger than 2 acres and the MCWD should review the plans. Depending on MCWD comments, ponding alternatives such as buffer strips may be appropriate for this site. Phosphorous loadings leaving the site should be limited to a maximum of 0.28 pounds/acre/year. A drainage area map with pre and post development calculations should be submitted for review. 5. Easements: Utility easements should be shown 5-feet wide along the interior lot line. Drainage easements should be provided across all wetlands, ponds and drainage ways. 2335 West Highway 36 • St. Paul, MN 55113 ■ 612-636*4600 • Fax: 612-636-1311