03-15-1999 Planning Packet - Laserfiche WebLink

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BONESTROO ROSENE ANDERLIK ^ I Bones troo Rosene m Anderlfk & I Associates Engineers & Architects March 15.1999 Elizabeth VanZomeren City Planner/Zoning Administrator City of Orono Post Office Box 66 Crystal Bay. MN 55323 Re; Oronu Middle School File No. 139-2471 ©6516361311 03/15/99 11:35 0 :01/02 N0:968 ArVtv/nA tne it A/fnnutt'vr (*>pfOfrt4rnty Ctnploviff Ono O Oonrtfuu. rc • JOSep'^f. An:trriia •'f • M.tr # ri L jm ft • RirhAfdi ru'ncr. Pt •OirnrtR Cool •Rnf.i 'tO Vh.jochi a QuufUuh. PC • RoUarrt W f?Cit*nf. Pt fnh Sut^n M C f A Srr*. n c ’ f^ti.'r ASSOCfiHe Hou^imJ A SAnrerC PC •«i*ifhA ltf,nu n Of • Putiirft R PfeffCfiiJ. P| • Picna^O W fnitrr. Pf • O.^viu O Lcihoi.-i ft • * •rn»\ri aia • M.i»» A ha*sica Ft • Mithatl T ffputmpnn. Pf • K ririu pc • K«nncfh r Ah'H ruin bf , n P£ , iCliJrivy P MWII'Aiviion fk . I S • &ol»»*rf I* • Agnct M (Itnrj • Mm P P.n. Pf • AiMfiPick Schmidt. PC Si RoiKetttr. WuiniAf v» MamiI MN • Alt ^ iti Wpbiitt. wwwROhfltfno f om Dear Liz: We have reviewed the preliminary plans for the proposed Orono Middle School. The site Is located cast of Old Crystal Bay Road, south of County Road 6 and north of Orono City Hall in the southeast quarter of Section 28. Wc have the following comments In regards to engineering matters. 1. Accent: 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 provide.! for maximum sight distances. .Signing, striping and lighting plans for this crossing should be submitted for review, ivde.sirian cro.sslngs 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 101.3.3. The proposed upper and lower floor elevation.! 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 .1 8. Tlii.s design would allow for gravity service to only the upper floor of the school. The dc-sign would provide a 3.1 2-foot build for MH 2. The cxi.sting MH 1 invert is low enough to allow for gnivity 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 propo.sed dc.sign docs not provide for gravity service to the entire building. The sanitary sewer schedule incorrectly identifies MH 2 a.s MH 1 . The sanitary 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 Infl-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 sonitary sewer / water main crossings. The connection to the existing sanitary manhole shall be core drilled and u rubber boot in.stalled. 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 ojsen cut? The nacthod of Installation should be specified. If the ro.^dway is open cut a street restoration detail and traffic control plan should be included in the plan set. All 1 2*inch volvcs should be buiierfly vuhes and o dciaii included in the plan set. One of the hydrants on the east side of the building should Iv moved to eliminate an approximate 30-foot gap In coverage near the center of the building. All hydr.inis should l5c u minimum of 50 feet away from the cxlcricr wail of the building. 4. Storm Sewer: We recommend that catch basins be provided at all four access l«x:ations. All stonn sewer should be reinforced concrete pipe. Wc recommend that the minimum pi|)e size for u storm sewer 2335 Weit Highway 36 • St. Paul. MN 55113 • 651*636*4600 ■ Fax; 651*636*13ll