06-20-2005 Planning Commission Packet

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� 2335 West Highway 36 • St. Paul, MN 55113 Bonestroo Rosene Office: G51-63G-4G00 • Fax: 651-G3G-1311 Anderlil<& www.bonestroo.com Associ�tes Engineers&Architects May 5, 2005 Ms. Janice Gundlach Plaiuier City of Orono . - Post Office Box 66 Crystal Bay, MN 55323 Re: 1146 Wildl�urst Trail File No. 139-OS-000 Plat No. OS-3100 Dear Janice: We have reviewed the revised site plans dated 5-3-OS 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 grad'uig.We have the following conmients with regards to engineering inatters: • The revised grading plan shows a proposed retaining wall along the northwest lot line. The wall does not meet the city standard 5-foot set back from the lot lirie and should be revised. • The retaining wall systeizi approaches 14-feet in height on the lake side of the home. This will have a massive visual impact from the lake and could have significant im�acts on the property to the east in the event the wall failed. The wall height could be nzitlimized if the house footprult was moved northwesterly towards the road 10 to 15-feet. • Retauiing walls that exceed 4-feet ui height require a separate engineered design and detail submittal. • The concept of routing storm water along the northeasterly side of the home and then tui7iulg it towards the center of the lot on the lake side of the home is good, although the proposed swale grades exceed the 5%maximum we typically recommend for a vegetated swale. The plans should include swale stabilization details or the swale grades should be reduced. • An existing catch basin is shown south and west of the hoine but no information is included as to the downstream pipe.City records indicate the downstream�ipe discharged towards the center of the lot and flows were routed from the discharge poi�lt towards the lake tlu�ough a swale.The swale conveyed the storm water around the southwest side of the boat house.This swale has silted in over the years and the drainage systeni no longer fiuictions as it should. The grading plan should include the existing pipe inforn�ation and should include infoi•maiion as to how the swale can be regraded once the Uoat house is removed. • City records also indicate that at one time there was a downspout sysiem in place along tl�e northeast side of the home to route water away from the existing home. The city has verified that fliis system no longer functions and the property to the east of this site has experienced water problems due to runoff from this site. The plans should include provisiotis as to how St. Paul, St. Cloud, Rochester, MN • Milwaul<ee, WI ■ Chicago, IL Affirmative Action/Equai Opportunity Employer and Employee Owned