05/09/2007 P&Z Minutes - Laserfiche WebLink

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Planning & Zoning Board May 9, 2007 Page 7 APPROVED MINUTES Board members wondered why the ponds did not include a bench for safety reasons. Mr. Studenski explained that the applicant is not creating any water storage areas and the ponds will not be designed to be long-term. Mr. Studenski informed the boa rd that caution signs are typi cal with development, and signs will be placed along Birch St. so it is no t necessary to include this as a condition. Applicant, Mr. Brian Bourassa, MFRA E ngineering, Plymouth, MN, and Adam Parker, hydrologist, answered questions for the board. Mr. Bourassa stated that berms around the dewatering equipment would be a great idea. He explained that the material they are going after is sandy material for building ro ads and house pads, and they will need an estimated 50,000 to 60,000 cubic yards for The Pres erve site. Mr. Bourassa said he lives in the area and is aware that traffic is difficult. He likes the idea of warning signs on Birch St. and 12 th Ave, and is open to staff’s reco mmendations regard ing flagging. Mr. Bourassa showed the board members the locat ion of the temporary storage on the site. He noted that the Environmental Board had suggested a specific seed mix for vegetation, and he will work with Marty Asleson at the City. He said he didn’t show a bench because there is no development plan there, but realizes at some time a bench will probably be required. He noted that the water level in the ponds is estimated to remain what it is today. He said they do not antici pate accessing the third excavation site. He described that if they use si x to eight 12-yard trucks to haul the estimated 50,000 cubic yards of dirt during haul hours, it would ta ke 13 days if everything ran perfectly. Realistically, they estimate it will take four to six weeks to haul the dirt for The Preserve. Mr. Parker explained to the board the dewate ring process that will be used on the site. He explained that a number of engineers on staff will help determine the best vegetation and will follow the city’s recommendations. He explained that SWPPPs will limit dust and keep topsoil in place. Board members expressed concern about water levels, safety of th e excavation site and street clean-up and maintenance. Mr. Parker remarked that the vegetation used will be selected to handle the water levels, with only three to four foot fluctuations expected. Mr. Bourassa added that there will be no discha rge from these basins and expects there to be less water or the same as there is today. Mr. Bourassa stated that silt or snow fencing will be used for safety. He explained that they are proposing a rock trench entrance to knock dirt off the wheels, a silt fence to prevent erosion from the pile, and will comp ly with requirements regarding street sweeping. Mr. Pogalz pointed out that th e application is for an exp ected use of 90,000 cubic yards, with 50,000 going to The Preserve. He asked if the excess material will be sold to another developer or development and why they should allow him to take the material off site. He asked why they couldn’t just ta ke the 50,000 to 60,000 for The Preserve. Mr. Bourassa replied that the pur pose is to haul the excess ma terial to a different site.