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City of Orono Page 2 201 1-00005 February 7,201 1 Response: The evaluation of the cur�ent plans can not rely on 1989 survey information. The current plan must use current survey information and d�ainage palterns 4. We can eliminate the retaining wall, it was provided to give some flat area on the rip rap before the storm water entered the lake, but we could extend the pipe down to the 930 contour and eliminate the wall, but the outlet would be very close to the lake. In as much as it is an emergency overFlow, water should very seldom flow through it anyway. Response: Thank you. 5. If the Lot Surveys Topography is accurate, the low area west of the proposed home was created by grading and construction of the home on the neighboring lot 22 years ago and thus is not a wetland. I don't know how a wetland delineator could make any determination until the snow is gone and plants are growing so this would be a major delay for my client. Response:Minnehaha Creek Watershed District has jurisdiction ove�wetlands in Orono. It may be possible to meet with the District staff to make a determination without a wetland delineation. 6. I did provide an emergency overflow on the site by a swale graded toward the lake along the southwest property line on my first version of this plan but in a meeting with Orono, Mike Sharratt, my client tells me that Tom Kellog and Melanie objected to this grading and so I don't know how one would provide an onsite emergency overflow, unless the city's position on this has changed. If the driveway on the neighboring house was constructed as proposed,there should be an emergency overFlow in that direction, take a look at the Lot Surveys plan and let me know your thoughts and we could certainly verify how the driveway was built as mentioned above. Response: We understand that the preliminary overland emergency overflow grading is undesirable f�om both the builder's and city's uiewpoints It requires a/arge amount of grading within the 0-75'setback. However, the current plans must dea/with the current site conditions. 7. I would say that storage for two 100 year, back to back events, could not be provided in the small low area especially considering the 2 foot freeboard you requested and the slope needed for flow to the lake. Response:Ideally this storm event could be accommodated with installing parallel piping to the lake and/or enlarging the low area to the north. We would be willing to consider a drainage system that prouides the fo/%wing: a. No increased peak tlows to the neighboring property. b. No increased runoff volume to the neighbonng property. c. No change in the overtlow location on the neighboring property. (this�oute is currently not determined with the existing survey data) d. No impacls to the home o�ga�age at 3105 North Shore Orive. 8. I have attached pages from Orono's City Code 79-7c(2) and we can provide those items but first it would be good to decide just how we are going to address some of the problems above.