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• LRRWMO Meeting Minutes April 18, 1996 Page 7 Tun Stanton, Shamrock Development, reviewed the proposed townhouse project and explained the 30-acre site north of Riverdale is somewhat unusual. He reviewed a site plan of the azea and estimated there will be less than 2,000 cubic feet of fill. Jankowski asked if a DNR permit will be required. Stanton stated this delineation was conducted through a survey two and one-half years ago and it will come under the Deminimus Exemption #25 of the WCA. He pointed out Coon Rapids is the actual LGU but he wanted to present the plan to the LRRWMO for review of the ponding. Weaver asked how construction can start prior to issuance of a DiVR permit. Stanton explained the DNR area is not being impacted and they have begun work on the high ground. Weaver questioned the amount of fill. Stanton asserted Obermeyer's memorandum is incorrect in indicating a squaze footage that is too high. Stanton requested advise or input on changes desired by the LRRWMO. In response to Jankowski, Lynn Caswell, John Oliver & Associates, Inc., reviewed the outlet points, ponding, skimmers, and outlet into the wetland. He noted there is no major storm sewer system on the site. • Schultz asked if they have followed the recommendations of Obermeyer. Caswell and Stanton stated they have. It was noted that all runoff will go into a sedimentation pond. Weaver noted the engineer's recommendation indicates the storm sewer system must have adequate pipe and/or surface overflow capacity to convey the 100-yeaz frequency dischazge, not the 10-year capacity that stone sewer systems are typically designed for. Caswell pointed out the three leveling pipes between the two wetland azeas which will carry the 100-year capacity. Haas asked if the permit is being requested since these are considered Class B waters. Ferguson explained Coon Rapids asked the developer to present the plan to the LRRWMO. Ferguson explained the control structure discussed last year was not constructed but it will be completed as part of this project. Weaver questioned the elevation of the lowest habitable surface. Stanton stated it is about 2.8 feet above the 100-year point which will comply with separation required to qualify for FHA financing. A discussion ensued regarding grading and water elevations. Haas asked if a skimming device is included. Caswell stated this has been included and the information will be provided to Obermeyer. • Jankowski suggested Obermeyer review the sizes of the proposed ponds to assure they are adequate. Stanton noted there is some space for expansion and they will submit their plans to Obermeyer for review.