Date: Tert-butylbenzene Tetrachloroethene Toluene trans-1,2-dichloroethene trans-1,3-dichloropropene Trichloroethene Trichlorofluoromethane Vinyl chloride DL/LOQ Units RFW-3D 2018 11/7/2018 RFW-3D 2020 3/5/2020 RFW-3D 2021 5/10/2021 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 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 4 Croton Point Sanitary Landfill Railroad 1 Landfill, NYSDEC Site #360001 Post Closure Monitoring and Sampling Report, Table 1(RFW-4): Groundwater Constituent: Sampling Period: Sampling Date: DL/LOQ Units RFW-4 2018 11/7/2018 RFW-4 2020 3/5/2020 RFW-4 2021 5/10/2021 4" 32.50' 7.4' 25.1' 7.8'-7.4' 663 75000 14200 115000 61300 774000 <LOQ <LOQ <LOQ 414 <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ 588 <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ >500 4" 80.50' 7.40' 25.1' 7.8'-7.4' 608 69600 24400 106000 56100 774000 <LOQ <LOQ <LOQ 580 <LOQ <LOQ <LOQ <LOQ 87 <LOQ 533 <LOQ <LOQ <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" 80.50' 6.90' 74' 7.50'-6.90' 660 80300 13000 123000 58000 859000 <LOQ <LOQ <LOQ 330 <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ 492 <LOQ <LOQ <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 9.6 80300 1500 <LOQ 71 6.8 75000 1400 <LOQ 68 4.4 69600 1300 0.01 67 1 1 40 0.2 units mg/L ug/L ug/L 20 710 <LOQ <LOQ 15 660 <LOQ <LOQ 200 610 <LOQ <LOQ 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-4): Groundwater Constituent: Sampling Period: Sampling Date: DL/LOQ Units RFW-4 2018 11/7/2018 RFW-4 2020 3/5/2020 RFW-4 2021 5/10/2021 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 123000 28.1 <LOQ <LOQ 6.65 115000 24.9 <LOQ <LOQ 6.82 106000 25.2 <LOQ 0.0517 6.99 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 <LOQ 3288 31.6 4.32 36.4 <LOQ 2988 29.7 5.1 5.9 <LOQ 2868 29.4 3.29 160 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 4.03 <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 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 0.004 0.013 Complete Complete Complete Complete 2 Croton Point Sanitary Landfill Railroad 1 Landfill, NYSDEC Site #360001 Post Closure Monitoring and Sampling Report, Table 1(RFW-4): Groundwater Constituent: Sampling Period: Sampling Date: 1,2-dichloroethane 1,2-dichloropropane 1,3,5-trimethylbenzene 1,3-dichlorobenzene 1,3-dichloropropane 1,4-dichlorobenzene 2,2-dichloropropane 2-butanone 2-chlorotoluene 4-chlorotoluene Benzene Bromobenzene Bromochloromethane Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chloroethane Chloroform Chloromethane cis-1,2-dichloroethane cis-1,3-dichloropropene Dibromochloromethane Dibromomethane Dichlorodifluoromethane Ethylbenzene Hexachlobutadiene Isopropylbenzene Methyl iso-butyl ketone Methyl tert butyl ether Methlene Chloride Naphthalene N-Butylbenzene N-propybenzene O-xylene P & M-xylene P-isopropyltoluene SEC-butylbenzene Styrene DL/LOQ Units RFW-4 2018 11/7/2018 RFW-4 2020 3/5/2020 RFW-4 2021 5/10/2021 0.5 0.5 0.5 0.5 0.5 0.5 0.5 2 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 2 0.5 0.5 0.5 0.5 0.5 0.5 1 0.5 0.5 0.5 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 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 <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ <LOQ