01d_NCS000250 Retrofit Program Overview 2019

NORTH CAROLINA
Department of Transportation
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BMP Retrofit Program
Joe Dunnehoo, PE
September 2019

Program Objectives
i. Develop, implement and support the NCDOT
program to be consistent with NPDES post -
construction control measures and support
development of the BMP Toolbox.
ii. Use retrofits to address pollutant loading from
existing NCDOT activities.
iii. Retrofits should not be associated with meeting
the requirements of any other DEMLR or DWR
program, unless otherwise allowed.

Permit Requirements
Identify potential retrofits. Identify a minimum of fourteen (14) potential retrofits per year.
Maintain a program to implement Maintain a program to implement retrofits. Complete a total of seventy (70)
retrofits. Complete a total of retrofits over the 5-year period of this permit. The retrofits will be
seventy (70) retrofits over the 5- appropriate for the identified pollutants of concern. Include in the annual
year period of this permit. The report the number of retrofits completed.
retrofits will be appropriate for the
identified pollutants of concern.
Include in the annual report the
number of retrofits completed.
3

B M P Retrofits
• Current Status
NPDES
Required 280 (End of Term IV(9/30/2020)
Completed 277
Construction 0
Design 14
• ~$9.6 Million in Construction Costs over Term
through IV
• Roughly Averages ~$79,000 per BMP
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BMP Retrofits — 1-40WB/1-85SB
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Retrofit Sites — Target Areas
Watersheds
BMP Solutions
• Impaired Waters (other • Robust BMP Types
than for Mercury) • Bioretention, Bio-Swales,
• Water Supply BFC's, Filtration,
Watersheds Infiltration
(WS-II & WS-IV) Targeting BMPs for
• SA treatment of multiple
• HQW POC's
• NSW Nutrients, Temperature,
• Trout Bacteria
• (Not just TSS)

BMP Retrofit — Ross Program
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Retrofit Opportunities (ROs)
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Not Assigned
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Completely Investigated
12-digit HUC Watershed
NCDOT City Boundaries
Municipal Boundary
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