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Staten Island Bluebelt

Staten Island Bluebelt. NYC Department of Environmental Protection July 2,2010. Staten Island Bluebelt. Staten Island Bluebelt Watersheds. 3. Project Background. South Richmond, Staten Island: Last large unsewered part of New York City. Last significant stand of wetlands.

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Staten Island Bluebelt

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  1. Staten Island Bluebelt NYC Department of Environmental Protection July 2,2010

  2. Staten Island Bluebelt

  3. Staten Island Bluebelt Watersheds 3

  4. Project Background • South Richmond, Staten Island: • Last large unsewered part of New York City. • Last significant stand of wetlands. • Failing septic systems and street flooding. • Need for new drainage plans that: • Provide necessary infrastructure. • Preserve wetlands. 4

  5. Project Background • South Richmond, Staten Island: • Drainage plans dating from the 1960’s assumed full sewering eliminating all wetlands. • Public policies to protect wetlands: • NYSDEC freshwater and tidal wetland regulations. • SSRDD enacted Open Space Network. • City and state parks created. • How to preserve wetlands while providing drainage infrastructure? 5

  6. Staten Island Bluebelt Program: Overall Strategies • Develop storm water management system utilizing existing wetlands. • Collect street runoff in storm sewers; improve capacity of hydraulic structures. • At sewer-wetland interface, use BMP's to mitigate impacts of urban runoff and local flooding. • Build separate sanitary sewer system. 6

  7. Typical Schematic of Bluebelt Drainage Plan with BMP's Storm Sewers 5 Outlet Outlet Stilling Stilling Extended Extended Basin Basin Detention Detention Existing Pond Sand Filter Sand Filter 4 3 NYCDEP NYCDEP State State Bluebelt Bluebelt Wetland Wetland Boundary Boundary Boundary Boundary Micropool Micropool NYC Park Boundary NYC Park Boundary Forebay Forebay 6 Upper Pool Lower Pool 2 Micropool 1 Forebay Forebay 7 Constructed Constructed Micropool Wetland Micropool Wetland 8 • Extended Detention Basin • Pocket Wetland • Sand Filter • Retrofit of Existing Pond • Outlet Stilling Basin • Culvert Reconstruction • Meandering Stream • Stream Restoration 7

  8. Staten Island Bluebelt Program: Planning Process Evaluation of Alternatives Interagency Drainage Plan Coordination Public Presentations Impact Analysis Draft Environmental Impact Statement Regulatory Public Agency Review Review Final Environmental Impact Statement Final Designs Permitting Construction 8

  9. BMP RC-4: Construction Sequence Step 1: The site is cleared of debris and brush. Step 2: The land is excavated and graded to form the desired topography for the new wetlands. 9

  10. BMP RC-4: Construction Sequence Step 3: For subsurface preparation, a Claymax liner, subsoil and topsoil are overlaid. Step 4: Erosion control mat and wetland plantings are installed. 10

  11. BMP RC-4: Construction Sequence Step 5: Storm water is introduced into the constructed wetland. Functioning constructed wetland after one growing season. 11

  12. Bluebelt Field Management • Vactor Operations • Maintenance Accessways • Perimeter Treatments • Field Operations • Adopt-A-Bluebelt 12

  13. Vactor Operations 13

  14. Maintenance Accessways & Perimeter Treatments Maintenance Accessways Perimeter Treatments 14

  15. Adopt-A-Bluebelt Program 15

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