Michael Tamblin, P.E., BCEE Stearns & Wheler, LLC Protecting and Enhancing the Ramapo Watershed – A Designated Sole Source Aquifer Supplying New York and New Jersey

Presentation Overview Background Summary of Projects Water Wastewater Acknowledgements

5 Towns 19 Villages ~90% Developed ~30% Park Land/Open Space 8% Population Increase from the 1990 to 2000 Census Report Facts:

Background Information County Area (Square Miles) Population (Persons) Dutchess802280, Orange816341, Putnam23195, Rockland174286,7531,648 Sullivan97073,96676 Ulster1,126177, Westchester433923,4592,133 Population Density (Persons per Square mile)

Background Information Water Systems United Water of New York (29 mgd) Nyack Water (2 mgd) Village of Suffern (1.8 mgd) Private Wells Wastewater Systems Rockland County Sewer District No. 1 (28.9 mgd) Haverstraw Joint Regional Sewerage Board (8 mgd) Stony Point Sewer District (1 mgd) Town of Orangetown (12.75 mgd) Village of Suffern (1.8 mgd)

Rockland County Proposed Water Reuse Precipitation Ramapo River Sources

Rockland County Proposed Water Reuse Surface Water Treatment Plants Exports

Rockland County Proposed Water Reuse Surface Water Treatment Plants Combined Precipitation Ramapo River

Rockland County Proposed Water Reuse Orangeburg Western Ramapo Reuse

Rockland County Proposed Water Reuse Orangeburg Western Ramapo Everything Combined Surface Water Treatment Plants Precipitation Ramapo River

Background Information Water Source for New Jersey 2,000,000 New Jersey Users

Background Information Environmentally Sensitive Areas Parks, Wetlands, Floodplains, Wild, Scenic and Recreational Corridor, and Mountains Federally Designated Sole Source Aquifer Threatened and Endangered Species Historic Sites Failing Septic Systems (~10%)

Location

Project Objectives Protection of Public Health Protection of Environmental and Natural Resources Protection of Sole Source Aquifer that Serves New York/New Jersey

Advanced Wastewater Treatment Plant 1.5 mgd Advanced Treatment Facility Discharge Effluent to Ramapo River at Two Locations Utilize Design – Build – Operate Procurement

Public Concerns of Reuse Discharge of Pharmaceuticals (USGS Report) How we Address This Issue Design of the Plant Treatment Components for Future Provide a High Level of Treatment with Redundant Systems How we Address This Issue Multi Barrier Approach

Proposed Level of Treatment Ramapo River Quality 2.2 mg/L 52 mg/L mg/L 0.06 mg/L /100 ml --- Class A Water Source Standards /100 ml NTU Drinking Water Standard mg/L % Removal 99.99% Removal 0.3 NTU Parameter Biochemical Oxygen Demand (BOD 5 ) Suspended Solids Ammonia Nitrates Total Phosphorus Chlorine Residual Dissolved Oxygen Fecal Coliforms pH Giardia Cysts Enteric Viruses Turbidity WWTP Treatment Effluent <5 mg/L <1 mg/L (as N) 6-7 mg/L 0.2 mg/L mg/L 7 mg/L 200/100 ml 6.5– % Removal 99.99% Removal 1-3 NTU

Schematic of Western Ramapo AWT Raw Sewage Screening and Grit Removal Primary Settling Tanks Biological Nutrient Removal Tanks Final Settling Tanks Sand Filters Membrane Filters Post Aeration Disinfection Effluent Pump Station Effluent Force Main to the Ramapo River Cl 2 (Optional) SO 2 (Optional) Chemical Addition

Potential Benefits of Additional Flow Alleviate Drought Conditions Controlling the County’s Destiny

Western Ramapo Advanced Wastewater Treatment Plant Project Ramapo Valley Wellfield Operations Existing Flow8-10 mgd, 90% of the time 0 mgd, 10% of the time 1 mgd8-10 mgd, 95% of the time 0 mgd, 5% of the time 3 mgd8-10 mgd, 98% of the time 0 mgd, 2% of the time 5 mgd8-10 mgd, >99% of the time 0 mgd, <0% of the time Availability to Rockland County Users Additional Flow

WWTP Discharge Locations

AWT Site

Acknowledgements Rockland County Sewer District No.1/Board of Commissioners Rockland County Executive/County Legislature Stearns & Wheler Engineers

Questions & Answers