06-10-2002 Council Packet - Laserfiche WebLink

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^ J Bonestroo Rosene V B Anderlik & 1 vll Associates Engineers & Architects May 9.2002 Mr. Mike Gaffron Planning Director City of Orono Post Office Box 66 Crystal Bay. MN 55323 Re: Orono Plaza PUD Concept Plan File No. 139-02-000 Plat No. 02-2789 Dear Mike: ■on*itroa. Roitn*. Andollk and Aiio<lai*t, Inc. It an Affirmailva Aciien/Exual Opporiuniiy Im^oycr afitf Cmpioytc Otwned rnnclpati: Orfo G Bor^estroo. BE • Marv.n I Sorvjfji. PC • Cleno B Cooh. P£ • RoPer: G StDumchl. PI • Jerry A Bourdon. PE Senior Coniulcants: RoOeri W Rosene. PC • Joseph C Anderhk. PE • Richjrd i. Turryer. PE • Susjn M. Eoertm. CPA. Affoclote Principeii; Re»m A^ Gordon. PC • RoPert R Prefferie. PI • Richard W Foster. PC. • Oavid O Loskota. PC • Mark A Hanson. PE • Michael T Rautmann. PC • Ted K Field. PC. • Kernech P Anderson. PE • Mark R Rolfs. PE • David A Bonestroo. M B A • Sidney P Williomsoa PC. L S • Agnes M Rng. MBA- Allan Rick SchrmdL PC. • Thomas W Peterson. PE. • James R Mafarsd. PE • Miles B Jensea PE • I Pruihp C'a*ei IJI. PE. • Oanel J Edgencn. p£ • Ismael Martmei. PE • Thomas A Syfko. PE • She'don J Johnson • Dale A Gro .r »£ • Thomas A. Roushar. P£ • RoPeri J Oevery. PL Orrices; St Paul. St. Cloud. Rochester and Willmaf. MN • Milwaukee. Vlfl • Chicago. IL U%5iile. wwwPcrestroo com Wc have reviewed the PUD concept plan for the proposed Orono Plaza development. The site is located in the northwest quadrant of the intersection of Willow Drive and TH 12. The proposal provides for a mix of residential housing and commercial development. Wc have the following comments in regards to engineering matters. 1. Sanitary Sew er: Sanitary sewer flows from the site will be routed to an existing sanitary sewer along the north side of TH 12. The existing sanitary sewer then flows southerly under TH 12 through a line just west of the Golf Dome property. This line serves an area north of TH 12 including the public schools along Old Cry stal Bay Road, the Willow View subdivision and the Medina Morningside neighborhood in Medina. Prior to the construction of the new Orono Middle School this sanitary line was nearly at capacity. The City recently constructed a bypass lift station along the south side of T.H. 12 to provide temporary relief for the additional flow s generated by the school. During peak flow times the bypass lift station pumps into an existing MCES forcemain along the south side of TH 12. The lift station was an interim measure and will remain in operation until the downstream infrastructure is upgraded to provide the necessary capacity. Currently the system is at capacity and cannot accommodate the additional flows generated by the proposed development until the system is upgraded downstream from the bypass lift station. Improvements to the existing sanitary line between the bypass lift station and the railroad (racks to the south would need to be a City project. The applicant should review costs for these improvements with the City. It is our understanding the system along the railroad tracks and to the east will be upgraded as pan of the proposed MX/DOT TH 12 improvement project. MN/DOT should be consulted to determine when the proposed sanitary scw*er improvements will be completed and to verify that the necessary capacity will be provided. Sanitary sewer shail be in installed in accordance with City standard details. Final plans should include plan and profile views of all sanitary sewer. 2. Water Main: The proposed water main from west to east should be 12 ” DIP. l*he alignment of the 12‘* main should follow the alignment of the proposed Kelley Parkway. Water main design throughout the ;cs: of the project appears acceptable. The two water main laterals serving the uniLs north of Kelley Parkway should be looped. Final plans should include plan and profile views of the proposed water main, water main details and service locations. 3. Storm Sewer: The draft version of the City ’s Surface Water Management Plan (SWMP) shows that this site lies within the Long Lake drainage district. The nanaiive provided with the application proposes to expand the existing M.N*/DOT ponds along the south side of the site. As part of the expansion the improvements propose to lower the normal water level of the pond by installing a new outlet pipe approximately 3-fcci lower than the existing outlet pipe. The existing pond outlet pipe discharges on the south side of TH ! 2. Storm water then flow s overland through a drainage ditch along the west side of the Golf Dome property. The drainage ditch is very flat and the Golf Dome e.xperiences occasional flooding during heavy rain events. The developer should provide additional information as to where and at what elevation the proposed outlet will discharge south of TH 12. A minimum of 2-fect of freeboard should be provided between all basement elevations and pond high water levels. The City has storm sewer near the proposed westerly pond. Additional details such as connections to the City storm sewer, proposed emergency overflows and discharge points should be provided for the pond along the west boundary. All storm sewer within 2335 West Highway 36 • St. Paul, MN 55113 • 651-636-4600 • Fax: 651-636-1311