06-17-2002 Planning Packet - Laserfiche WebLink

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i(\i Bonestroo £5 Rosene Ancleriik& ^\J| Associates Engineers & Architects May 9. 2002 Mr. Mike Caffrun Planning Director Ciiy of Orono Pott OfOcc Box 66 Crystal Bay. .MN 55323 •wmirM. ■•»€«*. AndMM «n« AiiofMtn. Inc. H m Allirauti** Acunn, t^Mi 0»M«t»imty (mnlay«* «ne ImptofM OcMirn riinciAalc Otto O Scv^tlroo *t • I So>«jU. rf • Otrm ■ Coo* fi • koOr't G H • trftf A BMAOon M t«n»or Confullonu^ lsC>*n W loi'nr f| • ioi*rA C An«rfU f| . t Ki'r>f Of • t.>t*n M fb«<X' C PA AiioclotoArtnctpalt: Kntn A OorOon ft • Oobtfi • flcrirtif ft • Ik H oO W four' ff •D**«IO loi*ot« fl • Wjr* A Kjmon fl • M<n«cl f ■*<«"»»»« f| • »e<J * fl • Cefmetn f An4r«tan fl • UUrt » Ooift ft • Dn>d A Bonettroo Mi A • t«rwT f WAMOnon. f I 11 • Agnrt M *«g MBA • A.ijn »<• l(*mdl ft • rr>on%fi W f«»»»ton ft • iAnri f MAjnd fl • M.t« ■ Jmtm ft • I fKA® 01 ft • 0*n«i I tOifnon ft tVTur) M»tt«ec ft • trioinM A i|rl*o ft • SnCAon J toAmon • OAr A Gro>« ft • A foutrvA ft • foOrfi J OtYTif ft oritctc. Si foA Si Cloud, fochcttcf ond WMmti. UN • MA oa A oc . in • Clacogo A WfOtito *«*i)on<tmiacom Re: Orono Plaza PUD Concept Plan File No. 139 02 000 Plat No. 02-2789 Dear Mike: We hate ret ieued the PUD concept plan for the proposed Orono Pla/a development The site is located in the northwcsl quadrant of the intersection of Willow Drive and TH 12. The proposal provides for a mix of residential housing and commercial deselopmenl. We have the following commenu in regards to engineering matters. I. Sanitary Sewer: Sanitary sewer flows from the sue will be routed to an existing sanitary sewer along the noiu. ide ofTH 12. The existing sanitary sewer then flows southerly under TH 12 through a line just west of the Golf Dome propeny. This line serves an area north of TH 12 including the public schools along Old Crystal Bay Road, tlie Willow View subdivision and the Medina Morningside neighborhiHxJ 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 flows generated by the school. During peak flow times the bypass lift station pumps into an existing MCES foiccnuin 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 tracks 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 uacks and to the east will he upgraded as part of the proposed MN/DOT TH 12 improvement project. MN/DOT should he consulted to determine when the pri'posed s.initary sewer improvements will be completed and to verify that the necessary capacity will he pros ided Sar.iiary sewer shall be in installed in accordance with City standard details Final plans should include plan and profile views of all sanitary Water Main: The propsned water main from west to cast should he 12" DIP. The ilignmcni of the 12 ’ mam should follow the alignment of the proposed K.r Hey Parkway. Water main design throughout the .es: of the project appears acceptable. The two water mam laterals serving the units north of Kelley Parkway should be looped Final plans sh.)uld include plan and profile views of the propv'sed water mam. water mam details and service liK.aiion.>. Storm Sewer: The draft version of the Ciiy's Surface Water Management Plan (S\\ .MP) shows that this site lies w ithin th. Long Lake drainage disiricl. The nanalive provided wiih (he application prop-- c$ to c xpa.id the existing .MN/DOT pon*ls along the south side of the site. As part of the expansion the improvei:M;nls propose to lower the normal water level of the pond by installing a new outlet pipe approximately 3-fcct lower than the existing ouilel pipe The existing pond outlet pipe discharges on the south side of TH 12. Storm water then flows owrland through a drainage diich along the west side of the Golf Dome property. The drainage ditch is very flat and the Golf Dome experiences occasional flooding during heavy ram events. The developer should provide additional mfomiatinn as to where and at what elevation the proposed outlet will discharge south of TH 12. A minimum of 2-fectof freeboard should be prov ided 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 pomu should be provided for the pond along the weu boundary All storm sewer within 2335 West Highway 36 • St. Paul, MN 55113 • 651-636*4600 ■ Fax. 6St-636-l3tl