05-16-2005 Planning Commission Packet

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Bonestroo Z335 West Highway 3G ■ St.P�ul, MN 55113 • Rosene Office: G51-G3G-4600 ■ Fax: G51-63G-1311 Anderlilc& www.bonestroo.com - Associates Engineers&Architects May 5, 2005 Ms. Janice Gundlach Plaiuier City of Orono _ - _ Post Office Box_66 . . _ ___ . _. _ _ __ _ _ Crystal Bay, MN 55323 Re: 1146 Wildhurst Trail File No. 139-OS-000 Plat No. OS-31Q0 Dear Jauice: 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 a.nd detached garage along with the associated site grading.We have the following conunents with regards to engineering matters: • The revised grading plan shows a proposed retainulg wall along the northwest lot line. The wall does not meet the city standard 5-foot set back from the lot line and should be revised. � The retaining wall system 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 impacts on the property to the east in the event the wall failed. The wall height could be minimized if the house footprint was moved northwesterly towards the road 10 to 15-feet. • Retaining walls that exceed 4-feet ul height require a separate engineered design and detail submittal. • The concept of routing storin water along the northeasterly side of the home and then turning it towards the center of the lot on the lake side of the honle is good, although the proposed . swale grades exceed the 5%maxinium we typically recommend for a vegetated swale. The plans should include swale staUilization details or the swale grades should be reduced. • An existing catch basin is sllown south and west of the home bul no infot7nation is included as to the downstream pipe. City recor.ds indicate the downstream�ipe discharged towards the cenier of the lot and flows were routed from the discharge point towards ihe lake through a swale.The swale conveyed the storm water around fhe southwest side of lhe boat house.This swale has silted in over the years and tlle drainage system no longer functions as it should. The grading plail should include the existing pipe information and sllould iilclude inforulation as to how the swale caii be regraded oiice the boat house is rernoved. • City records also i�ldicate tliat at one time tliere was a downs}�out system in place along the northeast side of the home to route water awly frocn the existing home.The city has verified that this system no longer functions and the property to the east of this site has experienced water problems due to runoff fronl tl�is site. The pl�ius should include provisions as to how St. Paul, St. Cloud, Rochester, MN ■ Milwaukee, WI ■ Chicago, IL Affirma[ive Action/Equal Opportunity Employer and Emptoyee Owned