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^ I Bonestroo Rosene Anderlik & |\ \ Associates Engineers & Architects March 15, 1999 Elizabeth VanZomeren City Planner/Zoning Administrator City of Orono Post Office Box 66 Crystal Bay. MN 55323 Re: Orono Middle School File No. 139-2471 Bonestroo. Rosene. Anderhk ^nd AssocuUes. Inc is «»n AfftrmMtve Action £qu^l Opporti^niiy Employer Principals Otto G Bonestroo. PE • Joseph C AndeMik, PE • M.^rvin L SorvaM. PE • Richard E Turner PE • Glenn R Cook. PE • RoPert G Schunicht. PE • Jerry A Bourdon PE • Robert W Rosene. PE and Susan M Ebcrhn. C PA Senior Consultants Associate Principals Howard A Sanford Pf • Keith A Gordon. PE • Robert R Pfcfferle. PE Richard W Foster. PE • David O Loskota. PE • Robert C Russek. A IA • Mark A Hanson. Michael T Rautmann. PE • Ted K Field PF • Kenneth P Anderson. PE • Mark R Rolfs. PE • Sidney P Williarnson. PE . L S • Robert F Kotsmith • Agnes M Ring • Michael P Rau. PE • Allan Rick Schmidt. PE Offices St Paul. Rochester Wiiimar and St Cloud MN • Milwaukee. Wi W-'e^J/fe W WW bonestroo com rtPCi’iV'-O m ' 7 1999 Qi'fV Or OfiOiXO Dear Liz: We have reviewed the preliminary plans for the proposed Orono Middle School. The site is located east of Old Crystal Bay Road, south of County Road 6 and north of Orono City Hall in the southeast quarter of Section 28. We have the following comments in regards to engineering matters. 1. Access: The proposed access locations appear to be acceptable. A pedestrian crossing should be shown at the south access. This location is near the crest of the hill and provides for maximum sight distances. Signing, striping and lighting plans for this crossing should be submitted for review. Pedestrian crossings at the northerly access should be discouraged. Geotechnical recommendations and pavement design should be provided for our review. 2. Sanitary Sewer: The plans show the invert elevation of the existing MH 1 at 1013.3. The proposed upper and lower floor elevations for the school are 1036.33 and 1023.00 respectively. The sewer service from the school would flow into MH 2, which has a proposed invert of 1031.18. This design would allow for gravity service to only the upper floor of the school. The design would provide a 3.12-foot build for MH 2. The existing MH 1 invert is low enough to allow for gravity service to both floors and provide adequate cover at MH 2 so that insulation wouldn’t be necessary and freezing wouldn’t be a concern. It is unclear why the proposed design does not provide for gravity service to the entire building. The sanitary sewer schedule incorrectiv identifies MH 2 as MH 1. The sanitarv sewer schedule should be revised to agree with the plans. All sanitary and storm sewer manholes and catch basins shall have an exterior sealing sleeve as manufactured by Infi-Shield or an approved equal. The City standard solid casting for sanitary and storm manholes is 1642B, the plans incorrectly show the casting number as R-1733. A note should be included in the plans specifying that sanitary sewer have 18 inches of clearance below the water main at all sanitary sewer / water main crossings. The connection to the existing sanitary manhole shall be core drilled and a rubber boot installed. Insulation should be provided for all sanitary sewer with less than 6 feet of cover. 3. Water Main: Will the water main crossing Old Crystal Bay Road be jacked or open cut? The method of installation should be specified. If the roadway is open cut a street restoration detail and traffic control plan should be included in the plan set. All 12-inch valves should be butterfly valves and a detail included in the plan set. One of the hydrants on the east side of the building should be moved to eliminate an approximate 30-foot gap in coverage near the center of the building. All hydrants should be a minimum of 50 feet away from the exterior wall of the building. 4. Storm Sewer: We recommend that catch basins be provided at all four access locations. All storm sewer should be reinforced concrete pipe. We recommend that the minimum pipe size for a storm sewer 2335 West Highway 36 ■ St. Paul, MN 55113 • 651*636*4600 ■ Fax: 651*636*1311