04/26/2006 Env Bd Packet - Laserfiche WebLink

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Surface Water Management The plan should show roof -top water directed to grass areas of yards. Rain gardens, although hard to see (Attachment 9), are designed into the front of the eastern bank of houses. Recommend this design be carried over into the western cul -de -sac bank of houses. Curb cuts should collect water off the road surface and flow into the rain gardens. These rain gardens should be low maintenance types, have a garden appearance, and be similar to those gardens designed in the Maple Wood or Burnsville retrofit garden models. Property owners were given a choice of planting type. The plants for these ponds, although encouraged to be, do not necessarily have to be native. Evaporative Control Systems could be an option for these gardens. These ponds should be separately funded from through storm water programming rather than restoration dollars. Infiltration Ponds and storm ponds and swales should be planted to native species in accordance with Critical Connections recommendations for restoration and management. All yard soils that will be planted with sod must have 4 inches of top soil thoroughly tilled into the soil before sodding. Storm Water Pollution Prevention Plan A Storm Water Pollution Plan is different from an erosion control plan. Developers typically submit an Erosion Control Plan. A Storm Water Pollution Prevention Plan (SWPPP) is a "living- breathing" document required under the Non -Point Discharge Elimination System requirements of the PCA. Stormwater management can change from day to day and the document should reflect anticipated and unanticipated events. An Erosion Control Plan typically has generic copy -paste text and pictures. A SWPPP gets very site specific. For instance, Attachments 6 and 7 talks about concrete truck cleanout areas. A SWPPP will locate a spot on the Map. The SWPPP needs to have a designated stormwater contact on the plan and a phone number that the person can be reached at. The SWPPP will address unforeseen events such as the need to dewater turbid site water. The SWPPP should define beforehand how this will be done so that polluted water does not leave the site. The Erosion Control Plan will clip -paste notes on rock entrances and the SWPPP will address who will replace /top dress rock filled with sediment. The SWPPP document must be in a designated place on site along with the required weekly and post rainfall event inspection sheets. A mailbox on the site marked SWPPP works best for the City. An acceptable SWPPP must be submitted to the City Environmental and Engineering, and prior to ground breaking.