public beach (SRF-2) and eastern channel of Croton Marsh (SRF-3), and to provide a location for background surface water quality monitoring, Tellers Point (SRF-1). Duplicate samples were taken at SRF-1 and 3. SRF-2A and B were taken at opposite ends of the bathing beach. Sampling results are provided in Table 2 for Croton and Table 7 for the Railroad Landfill. V. Sediment Sampling Post-closure monitoring included three locations for sediment sampling. The results of sediment sample analysis are presented in Table 3. VI. Leachate Sampling Pump Station 2 (PS2) was selected as the leachate sampling point for the Post Closure Monitoring Program. PS2 accepts flow from all potential sources in the leachate collection system and is therefore representative of overall wastewater discharge quality. The results of Post Closure leachate sample analysis are presented in Tables 4a for the Pump Station and 4b for the Railroad Sump. The tables also include the Daily Limits for the Wastewater Discharge Permit for comparison. VII. Leachate Collection System Metro-North Source Contributions On July 17, 1999, Metro-North Railroad ceased operation of its Harmon Wastewater Treatment Plant, and diverted the sewage flow to the Croton Point Park sewer system, at a point 4 Croton Point Sanitary Landfill & Railroad 1 Landfill NYSDEC Site #360001 Post Closure Monitoring and Sampling Report upstream of Pump Station #2 (the leachate sampling point). Table 5 provides the sewage contribution from the Metro-North connection provided from the daily readings as taken by Metro-North personnel and transmitted to DEF’s Wastewater Division. Note: This data is not yet available for 2021 to coincide with the May 2021 sampling period. VIII. Recommendations for Modifications to Sampling Protocol None at this time. 5 Croton Point Sanitary Landfill Railroad 1 Landfill, NYSDEC Site #360001 Post Closure Monitoring and Sampling Report, Table 1(RFW-1D): Groundwater Constituent: Sampling Period: Sampling Date: DL/LOQ Units RFW-1D 2018 11/1/2018 RFW-1D 2020 3/4/2020 RFW-1D 2021 5/6/2021 4" 50.90' 1.2' 49.7' 1.5'-1.2' 880 147000 1650 334000 117000 1500000 70.7 <LOQ <LOQ 78.4 <LOQ <LOQ <LOQ <LOQ 92.1 <LOQ 1580 <LOQ 21.3 <LOQ <LOQ <LOQ <LOQ >500 4" 50.90' 1.60' 49.3' 1.1'-1.6' 962 165000 2210 379000 141000 1910000 <LOQ <LOQ <LOQ 98.3 <LOQ <LOQ <LOQ <LOQ 89.7 <LOQ 1670 <LOQ 23 <LOQ <LOQ <LOQ <LOQ >500 Diameter (Inches): Well Depth, Tow (ft.): Depth to Water, Tow (ft.) Water Level Elevation (ft.): TOC - TOW (ft.): Boron Calcium Iron Magnesium Potassium Sodium Aluminum Antimony Arsenic Barium Beryllium Cadmium Chromium Cobalt Copper Lead Manganese Nickel Selenium Silver Thallium Vanadium Zinc Alkalinity as Calcium Carbonate 100 1000 50 1000 100 1000 50 20 10 10 10 10 10 10 50 10 10 10 20 20 10 20 80 5 ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L mg/L 4" 50.90' 1.25' 49.65' 1.60'-1.25' <LOQ 190000 1880 422000 79000 188000 111 <LOQ <LOQ 87 <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ 1610 <LOQ 35.3 <LOQ <LOQ <LOQ <LOQ >500 BioChemical Oxygen Demand Asp Calcium by ICP-AES Chloride - ASP ASP Total Cyanide Chemical Oxygen Demand 2 1000 5 0.01 5 mg/L ug/L mg/L mg/L mg/L <LOQ 190000 115 0.023 250 16 147000 98 0.034 240 4.4 165000 3780 0.018 270 1 1 40 0.2 units mg/L ug/L ug/L 50 2200 <LOQ 0.5 20 1700 <LOQ <LOQ 70 2000 <LOQ 0.224 Color, Apparent ASP Hardness as Calcium Carbonate Hexavalent Chromium, ASP ASP Mercury 1 Croton Point Sanitary Landfill Railroad 1 Landfill, NYSDEC Site #360001 Post Closure Monitoring and Sampling Report, Table 1(RFW-1D): Groundwater Constituent: Sampling Period: Sampling Date: DL/LOQ Units RFW-1D 2018 11/1/2018 RFW-1D 2020 3/4/2020 RFW-1D 2021 5/6/2021 ASP Magnesium Ammonia as N Nitrite Nitrogen as N N-Nitrate Calculated Corrosivity/pH 1000 0.05 0.01 0.05 0.1 ug/L mg/L mg/L mg/L units 422000 73.9 <LOQ <LOQ 7.28 33400 88.1 <LOQ <LOQ 7.33 379000 87.2 <LOQ <LOQ 7.24 Phenolics, Total Recoverable ASP Metal Digestion - Aqueous NH4 Preparation 0.025 mg/L <LOQ complete complete Sulfate, Aqueous Total Dissolved Solids Total Kjeldahl nitrogen as N-ASP Total Organic Carbon Turbidity 1 mg/L 2 mg/L 0.5 mg/L 0.1 mg/L as C 0.02 NTU 1.46 8100 110 30.5 4.82 1.89 6370 102 14.8 1.32 1.46 7500 110 6.61 27 1,2-dibromo-3-chloropropane 1,2-dibromoethane 2-hexanone Acetone Acetonitrile Acrolein Acrylonitrile Carbon Disulfide Methyl lodide Prep. Method Trans-1,4-dichloro-2-butene Vinyl Acetate 0.5 0.5 5 10 50 5 5 5 5 5 5 ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L ug/L <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ 1,1,1-trichloroethane 1,1,1,2-tetrachloroethane 1,1,2,2-tetrachloroethane 1,1,2-trichloroethane 1,1-dichloroethane 1,1-dirchloropropane 1,2,3-trichlorobenzene 1,2,3-trichloropropane 1,2,4-trichlorobenzene 1,2,4-trimethylbenzene 1,2-dichlorobenzene 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 ug/L ug/L ug/L ug/L ug/L ug/L ug/L