04-15-1996 Planning Packet - Laserfiche WebLink

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BONESTROO ASSOCIATES ® 6126361311 04/10/96 15:22 S:01/02 NO:755 Bonestroo Rosene Andeiiik & Assodates An**^!* .rfM/^at* OmHJttsjtuiy rtmi/fjoit Ollu C- d'Vrt*; irrv*<^ »*► • ic.ri*#'C. Ancl«»lfll Tl • M*rvm i. SnrvM.v • *»* ^ • TI>oiti4H Z Hoycx. • ifnnea G S(^ull1chL TC • ^««ry A A/HiffKMi • tccliir'i W Pi«kw*»« 'C ind !kuMin M in«*tin.f i*A.. Isti'ut /^iJOcOff ^rjor»p;»»c Hnw.i#fJ A ^unr«i«U. r*C • IC4}itrv A (>A«(iAn. PS.« 4oUirfl R. rftff«ile *?C- • l» <norn W i n%trr > i. • Pjwici C Hu\%mk. Al A • M*/k A N«A«Aa •**» • f f'C • *r<l K (S: iifftrrt Sf MM • KU-^»r^ M/i Engineers & Architects April 10.1996 Ms. Jeanne A. Mabusth, Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Forest Lake View File No. 139-2130 Dear Jeanne, We have reviewed the prcliminafy street, utility and grading plans prepared for l^rbcrt Johnson on the proposed Forest Lake View subdivision located west of WUdhurst Trail in the west half of Section 7. There are several inconsistencies shown on the three plan sheets and several issues that need to be addressed relative to engineering matters. 1. Utllltlas: Sanitary service to Lots 3 and 4 will be a problem based on the proposed bouse elevations. The invert of Manhole 4 should be four feet lower to adequately serve Lot 4 if the house will have a full basement, and Cleanout 4 should be one foot lower to serve Lot 3. The sanitary sewer should be installed at least 20 feet past the proposed curb line and possibly all the way to Garden Lane. The sewer service to Lot 3 should connect to Manhole 4 at a different location than the sewer extension or to the sewer line with a wyc. The plans should specify PVC pipe instead of VCP and VCT. The proposed sewer along Wildhurst Trail from Manhole 2 to Manhole 1 will be up to 16’ feet deep in places due to the steep slope. Shifting the alignment near the center of Wildhurst Trail would eliminate Manhole I ftmj allow the sewer to be more shallow. Installing the sewer in this location would require that Wildhurst Trail be reconstructed. 2. Sircatt The City and applicant should determine if this street will be public or private as different standards apply for each. The street grades appear adequate. The proposed street _section should be included in the final plan set. There is st^mc concern that there may be erosion in the ditches along the proposed street. It may be desirable to construct Wildhu«t Court to an urban section with curb. If done, the proposed catch basins and pipe should be moved east to the intersection of Wildhurst Trail. Drainage can then be directed to the proposed NURP pond and minimize flows out to Wildhurst Trail. 3, Gradings The grading plan and pond detail do not match. The pond will require up to a 20 foot excavation to construct In the wooded area. It may be easier to construct the pond closer to the existing culverts near Wildhurst Trail. This may require easements from the adjacent parcel. The grading plan should include the proposed ditch along Wildhurst Trail. Erosion control measures should be sht>wn on the plans. 4. Drainage: Drainage and ponding calculations should be provided. The outlet structure detail should include invert elevations for all pipes and show pond normal water and 2335 West Highway 36 ■ St. Paul, MN 55113*3898 • 612*636*4600