New York City Department of Environmental Protection
Waterbody/Watershed Facility Plan Alley Creek and Little Neck Bay
3.0 Existing Sewer System Facilities The Alley Creek and Little Neck Bay watershed/sewershed is divided between two major political jurisdictions: the Queens Borough of New York City and Nassau County, Long Island, New York. Most of the Queens County portion of watershed is served by the Tallman Island WPCP and associated collection system, shown on Figure 3-1 and described in Section 3.1. The Douglaston neighborhood, on the east bank of Little Neck Bay in Queens Borough, is principally served by on-site septic systems. Wastewater management in the Nassau County portion of the watershed is accomplished by three sanitary sewer districts: 1) the Belgrave Water Pollution Control District, the Great Neck Water Pollution Control District and the Village of Great Neck. The treated effluent from the Belgrave WPCP discharges to Udalls Cove, on the east side of Little Neck Bay. The treatment plants for the other two districts discharge to Manhasset Bay on the east side of the Great Neck Peninsula. In addition, there are properties not in the service areas of these three sewer districts that use on-site septic systems. The locations of the three wastewater treatment facilities and the respective sewershed boundaries are shown in Figure 3-2 and described in Section 3.3. 3.1
TALLMAN ISLAND WPCP
The Tallman Island WPCP is permitted by the NYSDEC under SPDES permit number NY-0026239. The facility is located at 127-01 134th Street, College Point, NY, 11356 in the College Point section of Queens, on a 31-acre site adjacent to Powells Cove, leading into the Upper East River, and bounded by Powells Cove Boulevard. The Tallman Island WPCP serves a sewered area of approximately 12,925 acres in the northeast section of Queens, including the communities of Little Neck, Douglaston, Oakland Gardens, Bayside, Auburndale, Bay Terrace, Murray Hill, Fresh Meadows, Hillcrest, Utopia, Pomonok, Downtown Flushing, Malba, Beechhurst, Whitestone, College Point, and Queensboro Hill. The total sewer length, including sanitary, combined, and interceptor sewers, that feeds into the Tallman Island WPCP is 430 miles. The Tallman Island WPCP has been providing full secondary treatment since 1978. Processes include primary screening, raw sewage pumping, grit removal and primary settling, air-activated sludge capable of operating in the step aeration mode, final settling, and chlorine disinfection. The Tallman Island WPCP has a design dry weather flow (DDWF) capacity of 80 million gallons per day (MGD), and is designed to receive a maximum flow of 160 MGD (2 times DDWF) with 120 MGD (1.5 times DDWF) receiving secondary treatment. Flows over 120 MGD receive primary treatment and disinfection. Wet weather flows to the Tallman Island WPCP are limited to less than 2 times DDWF due to conveyance system limitations which are currently being addressed by NYCDEP. The Tallman Island WPCP 2007 wet weather average sustained flow is 142 MGD. The daily average flow during 2007 was 55.2 MGD, with a dry weather flow average of 53.9 MGD (NYCDEP, 2008). Table 3-1 summarizes the Tallman Island WPCP SPDES permit limits.
3-1
June 19, 2009