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LRRWMO Meeting Minutes • April 18, 1996 Page 8 Weaver asked if the NPDES pemrit as been applied for. Stanton stated this may not be done but they will make application as soon as possible. He explained that once submitted, the NPDES must reply within 48-hours or you can proceed. Ferguson stated the Coon Rapids Engineering Department will follow this application. Motion by Weaver, seconded by Haas, to approve LRRWMO Permit #96-03, Natures Edge to construct a 94-unit townhouse development at the intersection of Round Lake Boulevard and Riverdale Drive in Coon Rapids subject to the following conditions: 1. The erosion control measures must be constructed at the initial stages of construction and be maintained until all areas altered on the site have been restored. 2. The applicant should be advised that a NPDES Construction permit is also required from the MPCA. 3. At the entryways on to the site, rock filter dikes being a minimum of 2 feet in height and having maximum side slope of four to one must be constructed. These rock filter dikes will enable construction traffic to enter the site and also provide an erosion control facility. The rock dikes must be continually maintained during the construction phase of the project. • 4. Street sweeping must be undertaken and completed on an as needed basis. 5. Upon completion of construction and restoration of disturbed areas, the permit application is responsible for the removal of all erosion control measures installed throughout the site. 6. The outlets from the water quality basins must be designed to provide skimming of floatable materials. The storm sewer systems to be located between the proposed structures throughout the development must be designed with pipe and/or pipe and surface overflow capacity for the100-year frequency storm discharge. 7. The water quality basins must be constructed at the initial stages of construction and be functional during the site grading portion of the project. 8. The low floor elevation of structures to be located adjacent to storm water detention/water quality basins and wetland areas must be established a minimum of one foot above the calculated 100-year frequency flood elevation of these facilities. Vote: 4 ayes, 0 nays. Motion carried. NOTE: Bob Obermeyer was in attendance after consideration of this permit and the following comments were made. Obermeyer commented on the difficulty in developing this unique site due to issues relative to elevations, dischage rates, sedimentation basins, manholes, etc. He noted there are several areas • where storm sewer pipes aze running between lots and he recommends, in those cases, either the pipe capacity or surface overflow be provided at a 100-year capacity. He recommended a standazd detail be included on the actual plan so there is no confusion when grading occurs. Obermeyer noted with the WMO requiring floor elevations above wetland elevations, it maybe prudent to include covenants