New York City Department of Environmental Protection
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Waterbody/Watershed Facility Plan Alley Creek and Little Neck Bay
the effectiveness of disinfecting the retention facility effluent in the presence of untreated and un-disinfected CSOs which will enter Alley Creek.
On balance it was judged that effective control of the chlorine residual discharge to the environment would be very difficult, and that the likely adverse ecological impacts associated with high chlorine residuals or depleted oxygen content from excessive addition of dechlorination chemicals would outweigh the desired public health objectives. •
Phase I, Stage 3 – Alley Pond Park Environmental Restoration – As mitigation for the disturbance due to the construction activities, permanent environmental restoration of approximately 23.5 acres within the Park will be performed under Contract ER-AC3, Alley Pond Park Environmental Restoration. This environmental restoration will take place on both the northern and southern sides of Northern Boulevard, east of 223rd Street. A location map of the restoration is shown in Figure 5-3. On the north side of Northern Boulevard, the restored area consists of approximately 17.2 acres, and is bounded by the boulevard to the south, Alley Creek to the east, Long Island Railroad to the north, and Cross Island Parkway to the west. The restoration in this northern area includes restoring existing/creating new wetlands (salt marsh), totaling approximately 8.2 acres, consisting of approximately 0.9 acre of open water and 7.3 acres of low marsh planted primarily with Spartina Alterniflora. The remaining 9 acres of restoration in this northern area consists of providing 8 acres of an upland/parkland community planted with a wildflower mixture, trees, shrubs and herbaceous plants native to the area, and 1 acre of a paver block roadway planted with native grasses. This roadway is needed for NYCDEP personnel to access the outfall sewer, storage facility and outfall structure for maintenance purposes. The area of restoration on the south side of Northern Boulevard consists of approximately 6.3 acres along the route of the double barrel outfall sewer between 223rd Street to the west and the boulevard to the east. In this southern area, restoration consists of providing 5.9 acres of an upland/parkland community planted with trees, shrubs and herbaceous plants native to the area, and 0.4 acre of a paver block roadway planted with native grasses. This project is not a CSO abatement project.
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Phase II – Oakland Ravine Stormwater – A wetlands stormwater treatment system is planned to manage stormwater flows from the Oakland Ravine. This flow will then be routed to Oakland Lake, and from there to Alley Creek via Outfall TI-008. This project is not a CSO abatement project. NEW YORK CITY SUSTAINABILITY INITIATIVES
Sustainable stormwater management usually involves replicating the natural water balance and stormwater dynamics through the design of natural ecological processes and functions, and controlling stormwater at the source. The technologies that serve this goal are referred to as stormwater best management practices (BMPs), and include a wide range of techniques that can capture stormwater, remove urban pollutants, reduce runoff volumes and
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June 19, 2009