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Alley Creek LTCP, Part B

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Alley Creek LTCP, Part B SECTION 4.0 GREY INFRASTRUCTURE CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay 4.0 GREY INFRASTRUCTURE 4.1 Status of Grey Infrastructure Projects Recommended in Facility Plans CSO Facility Planning for Alley Creek and Little Neck Bay began in 1984, predating the current LTCP program. Evaluation of the Tallman Island WWTP collection system showed that outfall TI-008 was the primary source of CSO discharges to these waterbodies. To address CSO discharges, DEP developed and modified several facility plans including the 2003 Alley Creek CSO Facility Plan (URS, 2003) and the 2009 Alley Creek and Little Neck Bay WWFP. The 2003 Alley Creek CSO Facility Plan proposed to reduce discharges from TI-008 by diverting the flow through a new chamber to a new 5 MG CSO Retention Tank and its new CSO outfall TI-025, located in Alley Creek. The 2009 WWFP recommended retaining the proposed Alley Creek CSO Facilities Plan, the Alley Creek Retention Tank and outfall TI- 025. A summary of the grey infrastructure elements of the WWFP are listed as follows: • New diversion chamber (Chamber 6) to direct CSO to the new Alley Creek CSO Retention Tank and to provide tank bypass to TI-008 • New CSO Retention Tank (5 MG Alley Creek Tank) • New 1,475 foot long multi-barrel outfall sewer extending to a new outfall on Alley Creek (TI-025) • New CSO outfall, TI-025, for discharge from the Alley Creek Tank • Fixed baffle at TI-025 for floatables retention, minimizing release of floatables to Alley Creek • Upgrade of Old Douglaston PS to empty tank and convey flow to Tallman Island WWTP after the end of the storm 4.1.a Completed Projects The Alley Creek CSO Retention Tank was operational as of March 11, 2011. DEP certified construction completion of the facilities on June 27, 2011. DEC accepted DEP’s certification of completion on September 25, 2012. 4.1.b Ongoing Projects There are no additional grey infrastructure projects currently in progress. 4.1.c Planned Projects No additional grey infrastructure projects are planned for the Alley Creek and Little Neck Bay watersheds for the reasons explained in Sections 6 and 8 of this LTCP. 4.2 Other Water Quality Improvement Measures Recommended in Facility Plans (dredging, floatables, aeration) There are no other water quality improvement measures planned for Alley Creek and Little Neck Bay. 4-1 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay 4.3 Post-Construction Monitoring The Post-Construction Compliance Monitoring (PCM) Program is integral to the optimization of the Alley Creek CSO Retention Tank, providing data for model validation, feedback to facility operations, and an assessment metric for the effectiveness of the facility. Each year’s data set will be compiled and evaluated to refine the understanding of the interaction between Alley Creek, Little Neck Bay, and the Alley Creek CSO Retention Tank, with the ultimate goal of fully attaining compliance with current WQS or for supporting a UAA to revise such standards. The data collection monitoring will contain three basic components: 1. The Alley Creek CSO Retention Tank WWOP as appended to Tallman Island WWTP WWOP; 2. Receiving water data collection in Alley Creek and Little Neck Bay using existing DEP Harbor Survey Monitoring (HSM) locations and adding stations as necessary; and 3. Modeling of the associated receiving waters to characterize water quality. The details provided herein are limited to the Alley Creek and Little Neck Bay PCM and may be modified as the City-wide program takes form. Any further modifications to the PCM program will be submitted to DEC for review and approval as described in Section 9.5. 4.3.a Collection and Monitoring of Water Quality in Receiving Water PCM for the Alley Creek CSO Retention Tank consists of sample collection at one location in Alley Creek (HSM Station AC1) and one location in Little Neck Bay (HSM Station LN1). In addition, DEP collected water quality samples at two other locations in the affected water body during November and December 2012 near the mouth of Alley Creek (LTCP FSAP Stations OW0 and OW1), and in Little Neck Bay south of HSM Station LN1 (Station OW2). Figure 4-1 presents a map of the HSM stations location. The location of the LTCP FSAP Stations OW0, OW1 and OW2 was depicted in Figure 2-26. 4-2 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay Figure 4-1. Alley Creek CSO Retention Tank Location of Facility and Water-Quality Monitoring Stations The Alley Creek and Little Neck Bay monitoring results are provided on Figures 4-2 through 4-5. The results are shown for DO, fecal coliform bacteria, enterococci bacteria, and TSS, respectively. The top panel of each figure shows the daily rainfall for 2012 (at LaGuardia Airport). The second presents the reported overflow volumes discharged from the Alley Creek CSO Retention Tank during the same period. The third panel shows the measured constituent concentrations for the stations in Alley Creek, and the bottom panel shows the measured constituent concentrations for the stations in Little Neck Bay. Applicable NYS WQS (Class I for Alley Creek and SB for Little Neck Bay) are also shown. On Figure 4-2, the DO-monitoring results for Alley Creek show occasional excursions below the criterion (4.0 mg/L) from July through October. In Little Neck Bay, DO values are generally above the chronic criterion of 4.8 mg/L, one measurement in June and three sampling events during mid-August to early- September. All DO measurements in Little Neck Bay were above the acute criterion of 3.0 mg/L. Figure 4-3 presents the fecal coliform concentrations measured in Alley Creek and Little Neck Bay. Discrete values in Alley Creek are often above the GM criterion (2,000 cfu/100mL), with the majority of high concentrations occurring during the summer. In Little Neck Bay, most discrete measurements are below the GM criterion of 200 cfu/100mL. The few discrete measurements above the criterion occurred during August, November and December. As shown on Figure 4-4, enterococci levels in Alley Creek are generally elevated with many values above 1,000 cfu/100mL and some values above 10,000 cfu/100mL. In Little Neck Bay, most samples are less 4-3 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay than 10 cfu/100mL but there are a number of values above 35 cfu/100mL during November and December. Figure 4-5 presents the results of TSS sampling in Alley Creek and Little Neck Bay. TSS concentrations in Alley Creek are quite variable with some measurements greater than 150 mg/L. Measured TSS concentrations are generally below 25 mg/L in Little Neck Bay with a few higher values during August and September. Figure 4-2. Alley Creek CSO Retention Tank Ambient Water-Quality Monitoring – Dissolved Oxygen, 2012 4-4 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay Figure 4-3. Alley Creek CSO Retention Tank Ambient Water-Quality Monitoring – Fecal Coliform Bacteria, 2012 4-5 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay Figure 4-4. Alley Creek CSO Retention Tank Ambient Water-Quality Monitoring – Enterococci Bacteria, 2012 4-6 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay Figure 4-5. Alley Creek CSO Retention Tank Ambient Water-Quality Monitoring – TSS, 2012 4-7 CSO Long Term Control Plan II Long Term Control Plan Alley Creek and Little Neck Bay 4.3.b CSO Facilities Operation – Flow Monitoring and Effluent Quality Flow Monitoring DEP monitors water-surface elevations and pumped volumes over time at the Alley Creek CSO Retention Tank. Based on these measurements and other information, DEP estimates daily inflow and infiltration (I/I), wet weather retained volume, pumpback volume, and overflow periods and overflow volumes. Tables 4-1 and 4-2 present a summary of the monthly and per-overflow-event estimates, respectively. Monthly monitoring data are also summarized graphically on Figure 4-6 (monthly total retained volume pumped back for treatment) and 4-7 (monthly overflow volume). Analysis 1 of rainfall data recorded at the National Weather Service’s LaGuardia Airport (LGA) gauge indicates that, with 125 storms totaling 36.18 inches, 2012 had less total rainfall and smaller storms than the long-term average in New York City. Monthly rainfall ranged from 0.91 to 5.06 inches. As summarized in Table 4-2, the Alley Creek tank overflowed during 25 storm events in 2012, meaning that the tank fully captured flow generated during the other 100 rainfall events (80 percent) in 2012. DEP reported that the tank retained a total of 256 MG of combined sewage for pumpback and treatment at the Tallman Island WWTP. A more detailed discussion of this information, including detailed discharge monitoring reports and methodology, can be found in the Post Construction Compliance Monitoring and CSO Retention Facility Overflow Summary for Calendar Year 2012 (August 2013, NYC DEP). DEP is in the final stages of a CSO Flow Monitoring Pilot Study, one of the primary goals of which is to better understand the monitoring technology’s ability to measure CSO overflows from regulator structures as well as at CSO storage facilities. The current measurement approach employed at the Alley Creek facility relies on depth measurements and weir equations that have inherent weaknesses due to the use of indirect measurements of overflows.
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