06-27-2005 Council Packet - Laserfiche WebLink

Home Browse Search

I J^Bonestroo g-gWosene vSAnderlH(& Associa te s Engitwers 4 Archllects 2335 West Highway 36 • St. Paul. MN 55113 Office: 651-636-4600 • Fax: 65F636-I3H wwwJjonestrooxom April 7.2005 Ms. Janice Oundlach Planner City ofOrono Post Office Box 66 Crystal Bay, MN 55323 Re:ll46WildhuntTniil Pile No. 139-05-000 Plat No. 05-3100 Dear Janice: We have reviewed the site plans for the proposed improvements to 1146 Wildhurst Trail. The site improvements include the removal of an existing house and boat house, the construction of a new house and detached garage along with the associated site grading. We have the following comments with regards to engineering matters: There is an existing city owned sanitary force main located along the north side of the boat house. Removal of the boat house and the associated site i^ing to restore the slope could impact the existing sanitary sewer. The sewsr should be shown on the plans and a note included with die plans stating that this sewer must be protected during any construction activities. A city public works official should be on site when any removal or grading activity occurs near this sanitary sewer. The city should verify that a drainage aitd utility easement exists over the sanitary sewer. If one does not exist the applicant should provide an easement 20-feet wide centered over the sewer. The grading plan shows proposed swales between the house and the side lot lines. Construction of the swale along the east lot line is proposed within a 5-fbot wide corridor between the proposed retaining walls and the east lot line. It will be difficult if not impouible to construct this swale within the 5-foot corridor provided. We recommend that at least 10-feet be provided for swale construction. A revised grading plan showing at least a 10-foot wide clear area in the side yards for swale coiutruction should be submitted for review and approval. A drainage area map and drainage calculations should be provided with the revised grading plan. The drainage calculations should include computationa that verify the proposed swales will contain runoff on the subject property for storma up to and including the lOO-year storm event The retainirig wall shown lake ward from the home approaches 10-feet in height All retaining walls that exceed 4-fbet in height require a separat e engineered design and detail submittal. Erosion control measures should be installed, inspected and approved by the city prior to any work on site. If you have any questions please call me at (651) 604-4863. Yours very truly. BONESTROO, ROSENE, ANDERLIK A ASSOQATES, INC. Tom Kellogg Cc: OregOappa,City ofOrono • St. Paul. St. Cloud. Rochester. Wlllmar. MN • Milwaukee. Wl • Chicago. IL AtnfUw ntWn/«SM*t oaawtwnrty