08-16-2017, 10:15 PM
WASA s Approach to Financial Risk Mitigation in CSO Program Implementation
Agenda
What is WASA?
CSO Program
Financial Risk Mitigation Examples:
Synergy with Other Programs
Alternate Project Delivery
What is WASA?
Independent Authority formed in 1996
Formerly Water and Sewer Utility Administration (WASUA) under Dept. of Public Utilities
Services Provided
Water Distribution
Wastewater Collection and Treatment
Storm water Collection and Conveyance
Serves
District
Parts of Maryland & Virginia
Blue Plains Wastewater Treatment Plant
Largest advanced wastewater treatment plant in the world
Capacity:
370 mgd annual average
1076 mgd wet weather
740 mgd full treatment
336 mgd excess flow treatment
Current average annual flow is 330 mgd
Synergy with Other Programs: Nitrogen Removal Requirements
LTCP was developed prior to nitrogen removal requirement at Blue Plains
TN removal was a goal equivalent to about 7.5 mg/L
No effluent limit
April 2007
New TN permit limit added to NPDES Permit
Hard annual cap effluent limit equivalent to about 4.16 mg/L TN
WASA considered many alternatives
By modifying the approach to treating wet weather flows, WASA could economically combine TN removal and wet weather treatment