CCP 10-04-2007 sp mtg - Laserfiche WebLink

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r< city O %W 0 BRIG IION the (1h; th1al works for, You interoff MEMORANDUM To: Janice Gundlach, City Planner From: Grant Wyffels, Director of Public Works Subject: Transoma Medical Site Date: August 16, 2007 Engineering Review Comments Contamination The site formerly was used for the Mengelkoch rendering facility and the east side was used as a dump. Contamination was found in several locations throughout the Northwest Quadrant and in July the City performed a partial removal of the existing dump materials on the east side and placed a four foot layer of clean cover over the remaining dump material. Along with the dump materials petroleum contamination was found on site. The MPCA, through the VIC program, has been approving site cleanup. Due to the nature of the remaining contamination we feel stor?nwater could be exposed to the contamination if it is infiltrated into the ground. In lieu of infiltration, a sand filter is being proposed and will be integrated into the regional storm water pond. Details have been provided as part of theplan set. Draina e Ryan Companies US, Inc. in conjunction with the City of New Brighton submitted a permit from the Rice Creek Watershed District for the above referenced project. The site is located on the east side of Old Highway 8 south of 14`h Street NW. The site is part of the City of New Brighton's Northwest Quadrant Redevelopment Area (NQRA). The general nature of the construction includes a 120,000 SF office building, a segment of the City's Northwest Parkway, reconstruction of 14`" Street NW, a storm water pond at the end of 14`n Street NW and a regional storm water pond. The existing site generally drainswest to east and discharges into the 1-35W right-of way. The developed site drainage is proposed to be captured by a system of catch basins and pipe then conveyed to a regional storm water treatment pond located on the south side of the railroad tracks. The pond then drains to an existing wetland and out to an existing ditch along 35W. 14`h Street NW will drain to a proposed storm water treatment pond at the east side of the road. A skimmer structure will be added to the existing culvert draining to the 35W ditch. The Northwest Parkway will drain to the existing rail road property the overland towards the pond currently under construction by the City along Old Highway 8 (Anoka Coop pond). When the Northwest Parkway is extended south the road will drain to the regional storm water pond.