Michael Tamblin, P.E., BCEEStearns & Wheler, LLC

Protecting and Enhancing the Ramapo Watershed – A Designated Sole Source Aquifer Supplying New York and New Jersey

Presentation OverviewPresentation Overview

Background

Summary of ProjectsWater

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 InformationBackground Information

County Area (Square Miles)

Population(Persons)

Dutchess 802 280,150 349

Orange 816 341,367 418

Putnam 231 95,745 414

Rockland 174 286,753 1,648

Sullivan 970 73,966 76

Ulster 1,126 177,749 158

Westchester 433 923,459 2,133

Population Density(Persons per Square mile)

Background InformationBackground Information

Water SystemsUnited Water of New York (29 mgd)

Nyack Water (2 mgd)

Village of Suffern (1.8 mgd)

Private Wells

Wastewater SystemsRockland 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 InformationBackground Information

Water Source for New Jersey

2,000,000 New Jersey Users

Background InformationBackground 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%)

LocationLocation

Project ObjectivesProject 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 PlantAdvanced 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 ReusePublic 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 TreatmentProposed Level of TreatmentRamapo River

Quality

2.2 mg/L

52 mg/L

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0.01 mg/L

0.06 mg/L

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551/100 ml

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Class A Water Source Standards

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7.0

200/100 ml

6.5-8.5

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5 NTU

Drinking WaterStandard

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10 mg/L

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0

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99.9% Removal

99.99% Removal

0.3 NTU

Parameter

Biochemical Oxygen Demand (BOD5)

Suspended Solids

Ammonia

Nitrates

Total Phosphorus

Chlorine Residual

Dissolved Oxygen

Fecal Coliforms

pH

Giardia Cysts

Enteric Viruses

Turbidity

WWTP Treatment Effluent

<5 mg/L

<5 mg/L

<1 mg/L (as N)

6-7 mg/L

0.2 mg/L

0.001 mg/L

7 mg/L

200/100 ml

6.5–8.5

99.9% Removal

99.99% Removal

1-3 NTU

Schematic of Western Ramapo AWTSchematic 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

Cl2

(Optional)SO2

(Optional)

Chemical Addition

Potential Benefits of Additional FlowPotential Benefits of Additional Flow

Alleviate Drought Conditions

Controlling the County’s Destiny

Western Ramapo Advanced Wastewater Treatment Plant Project Ramapo Valley Wellfield Operations

Western Ramapo Advanced Wastewater Treatment Plant Project Ramapo Valley Wellfield Operations

Existing Flow 8-10 mgd, 90% of the time 0 mgd, 10% of the time

1 mgd 8-10 mgd, 95% of the time 0 mgd, 5% of the time

3 mgd 8-10 mgd, 98% of the time 0 mgd, 2% of the time

5 mgd 8-10 mgd, >99% of the time 0 mgd, <0% of the time

Availability to Rockland County Users

Additional Flow

WWTP Discharge LocationsWWTP Discharge Locations

AWT SiteAWT Site

AcknowledgementsAcknowledgements

Rockland County Sewer District No.1/Board of Commissioners

Rockland County Executive/County Legislature

Stearns & Wheler Engineers

Questions & AnswersQuestions & Answers