07/25/2007 Env Bd Packet - Laserfiche WebLink

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1998. The biofiltration areas satisfy RCWD infiltration requirements. Development of this site is consistent with the sizing assumptions of Pond 2, thereby satisfying District rate control and water treatment requirements for this portion of the site. Site access for maintenance reasons must be shown on the plan for all NURP and biofiltration areas. Rice Creek Watershed has issued a CAPROC or Conditional Approval Pending Receipt of Changes. The changes include permanent signage to be placed every 50 feet at the wetland - upland interface where lot backyards abut wetlands Infiltration ponds must be separated from ground water by at least 3 feet. All ponding areas (infiltration /filtration /NURP) should be designed with a pretreatment area. All ponding /filtration /infiltration areas must have a public access for maintenance reasons. Environmental Site Plan Considerations Additional water quality and quantity issues can be achieved by minimizing parking spaces and consolidating planting parking lot planting islands into more rain - garden type of landscaping. Structural BMP's such as Evaporative Control Systems and /or Netlawn in these areas would help to reduce water volumes and improve water quality, while at the same time create a better condition for parking lot plants. Any additional parking requested by the developer above minimum requirements should be replaced with pervious type of paving. The gas station and car wash should contain spill containment design. The gas station should have a sump /trench to catch spill materials, and the car wash should have a plan to capture phosphorous that may spill out of the building. Since this area is in the AUAR area, and is expected to be of Conservation Development design, the higher standards of water volume control and quality improvement may be increased with the use of structural BMP's. Stormwater Pollution Prevention Plan The Stormwater Pollution Prevention Plan must conform to Minnesota Rules (Attachment 16). The following modifications should be made to the submitted SWPPP and submitted to the City Engineer for inclusion in the plan requirements: 1. A narrative of proposed construction activity should be included. • 2. Receiving waters must be identified.