1. MACo Winter Conference
Anne Arundel County
MACo Winter Conference
January 7, 2011

2. Chesapeake Bay TMDL Pollutants of Concern
Nitrogen
Phosphorus
Sediment

3. TMDL Allocation and Gap Determination
Existing Conditions Without BMP’s
Credit for existing
BMPs + Retrofits
Current Conditions
2009 Progress
Gap
Required Reduction
Pollutant Load
Reducible Load
Bay TMDL Allocation
E3 (Limit of Technology)
2009
2025 3

4. Chesapeake Bay TMDL Allocation
Anne Arundel County
Chesapeake Bay TMDL Allocation
Total Nitrogen = million lbs/yr
Total Phosphorus = million lbs/yr
Sediment = TBD

5. Pollutant Source Sectors
Wastewater Treatment Plants (WWTPs)
Septic Systems
Stormwater Runoff
Agriculture

6. Pollutant Source Sector Actors
Actors Where County Assumes Responsibility
County WWTPs
Privately Owned Septic Systems
County Stormwater Runoff
Actors Where County Does Not Assume Responsibility
Minor Municipal WWTPs
Minor Industrial WWTPs
Major Industrial WWTPs
Fort Meade WWTP
Federal Lands – Stormwater Runoff
State Lands – Stormwater Runoff
City of Annapolis – Stormwater Runoff
Agricultural Lands – Stormwater Runoff

7. Anne Arundel County Core Implementation Strategy
(1) WWTPs
Upgrading WWTPs to Enhanced Nitrogen Removal Capacity
(2) Septic Systems
Sanitary Sewer Extensions and Satellite Cluster Systems
(3) Stormwater Retrofits
Stormwater Outfall Restoration
Stormwater Pond Restoration
(4) Headwater Stream Erosion Prevention
Stream Channel Restoration
Ephemeral Channel Restoration

8. Point Source WWTP Participants
County Government WWTPs (≈ $270,000,000)
Federal Government WWTPs
Private Sector WWTPs

9. Septic System Participants
County Sanitary Sewer Extensions and Satellite Cluster Systems (≈ $800,000,000)
Private Sector Septic Systems

10. Stormwater Retrofit Participants
County Government (≈ $400,000,000)
State Government
Federal Government
City Government
Agriculture
Privately Owned Land

11. Headwater Stream Erosion Prevention Participants
County Government (≈ $400,000,000)
State Government
Federal Government
City Government
Agriculture
Private Sector

12. Degraded Stream Conditions12

13. Ultimate Goals Restored Stream Stability
Restored Hydrology within Floodplains and Streams
Restored Biological Health of Streams
Compliance with Water Quality Standards

14. Step Pool Stormwater Conveyance (SPSC) Restoration Strategy14

15. What is the Potential Cost to Anne Arundel County?
County WWTPs (≈ $270,000,000)
Sanitary Sewer Extensions and Satellite Cluster Systems (≈ $800,000,000)
Stormwater Retrofits (≈ $400,000,000)
Headwater Stream Erosion Prevention (≈ $400,000,000)
TOTAL ESTIMATED COST: $1.87 Billion