integrated planning & permitting - ccswcd€¦ · enabling integrated planning . building the...
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Integrated Planning & Permitting:
by David Cedarholm, P.E. Durham Town Engineer
November 21, 2013 20113 Maine Stormwater Conference Portland, ME
A Case Study of the Team Effort between the Town of Durham, NH
and the University of New Hampshire
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Great Bay Estuary
Watershed Gulf of Maine
Durham
Portsmouth
Dover
Rochester
Exeter
Newmarket
Somersworth
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Oyster River Watershed
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Percentage of the Oyster River Watershed within Each Community
38%
14% 5%
24%
17%
2%
14%
Durham/UNH
Durham/UNH 38% Barrington 14% Dover 5% Lee 24% Madbury 17% Nottingham 2%
Gulf of Maine
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CWA Mandate: Reduce Nitrogen Inputs and Address Impairments
25% of the TN Load is Point Source: EPA enforcing new Limit of Technology NPDES Permits with WWTP effluent limits of 3 mg/L Total Nitrogen (TN).
75% of the TN Load is Non Point: New Draft NH MS4 Stormwater Permit will require control of stormwater and implementation of response plans to address listed impairments. All Durham’s water bodies are listed as impaired
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Multi-Dimensional Integrated Watershed Plan Integrated approach to Clean Water Act compliance
• Durham’s WWTP NPDES Permit • Durham’s MS4 Stormwater Permit • UNH’s MS4 Stormwater Permit
Balance Water Quality Objectives between Sustainable Point Source (WWTP) and Green Non-point Source Improvements (Watershed).
Integrate interests of ALL watershed stakeholders with a focus on education, participation and improving water quality.
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Durham Wastewater Treatment Plant
WWTP N Load represents ~20% of the total annual watershed load.
Strategic Upgrade in 2004 reduced average N Conc. < 8 mg/L
Optimize WWTP Operations Current Ave Discharge of 1.0 MGD NPDES Permit Expired in 2004
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To Get to 3 mg/L or “Limit of Technology” Estimated Capital Cost of $20 million
(Annualized Cost = approx. $1.6 million over 20 years) Add’l Annual O&M Costs/yr = $500,000 to $750,000 Will require supplemental carbon source (e.g., methanol) to
stimulate biological activity to get to 3 mg/L. Added Carbon Footprint with Chemical Deliveries and Poses
an Onsite Storage Hazard
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Integrated Approach Achieve N Load Reductions in the Watershed by Balancing
Sustainable WWTF Upgrades and Green Non-Point Source Measures. Upgrade Plant to 5 mg/L TN “Sustainable Limit of
Technology” Estimated Capital Cost = $12 million Est. Add’l Annual O&M Cost = $250,000 Est. Potential Annual Savings ~ $ 1+ million/yr
Avoid the need for supplemental chemicals
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Integrated Watershed Plan: Key Goals Redefine the “quantitative” WWTP Permit from a
concentration (mg/L TN) limit to a watershed annual LOAD (lbs TN) limit.
Redefine “qualitative” MS4 Stormwater Permit goals with measureable “quantitative” Non-point Source TN reductions.
TRADE Non-Point Source load reductions for equivalent load reductions at WWTP to meet Limit of Technology mandate. .
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Enabling Integrated Planning Building the Basis for Integration: Willing Partners (Town, UNH,
EPA, NHDES) Supportive Stakeholders Data Availability Real-time WQ Monitoring Hydrologic and Hydraulic
Models
EPA is encouraging integrated planning through recent memorandums by Nancy Stoner and Cynthia Giles
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Integrated Plan Study Elements Develop Oyster River Watershed Mgt Plan Education and Outreach to Engage other Stakeholders Perform Additional Baseline WQ Monitoring Enhance Storm System Mapping / Asset Mgt Program Pilot WWTF Optimization Process Implementation Plan & Schedule with Reduction Goals Develop N Load Reduction Tracking Procedure Develop Monitoring Program to Track Progress
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Integrated & Adaptive Elements
Stakeholder Engagement
Enhance Baseline WQ Monitoring
Data
Oyster River Integrated
Watershed Mgt Plan
Pilot WWTF Optimization
Nitrogen Credit Tracking & Accounting Procedure
Implementation of Solutions During Plan
Development
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Potential Challenges
Setting Reasonable Implementation Timeline Post-Implementation Measurement of Success Establishing Universal Framework for Nitrogen
Tracking and Accounting Adaptive Management as Milestones are Met Funding Off-site Improvements
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Special Thanks To: Vanasse Hangen Brustlin, Inc. (VHB)
Woodard & Curran
UNH Facilities & UNH Stormwater Center
NH Dept. Environmental Services
US EPA Region 1
Oyster River Watershed Towns (Lee, Madbury, Barrington, Dover)
Oyster River Watershed Association and Local Advisory Comm.
Strafford County Conservation District
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Questions?