vdot ’ s stormwater management program asce presentation february 20, 2014
TRANSCRIPT
VDOT’S STORMWATER MANAGEMENT PROGRAM
ASCE PRESENTATION
February 20, 2014
PRESENTATION OUTLINE
VDOT SWM Program Overview/Challenges Roy Mills – L&D Division
Stormwater Management Regulations in Virginia
and VSMP Part IIB Technical Criteria Ginny Snead, P.E. – Maintenance Division (Louis
Berger contract employee)
TMDL (Total Maximum Daily Load) Program Tracey Harmon – Environmental Division
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VDOT’S STORMWATER MANAGEMENT PROGRAM AREAS
Erosion and Sediment Control o Construction site controls
Post Construction Stormwater Managemento Water quality/quantity BMPs
VSMP Construction Permito Coverage for regulated land disturbing activities
MS4 Permito Covers VDOT operations in the 15 Census Urban Areas
of the State
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PROGRAM ADMINISTRATIONVDOT CENTRAL OFFICE
Manages statewide programDevelops policies and guidance
VDOT DISTRICT/RESIDENCY OFFICES Implements policies and procedures
OFFICE OF THE STATE SWM PROGRAM
ADMINISTRATOR (CO L&D)Develops policies/guidanceProvides/coordinates trainingManages budget & consultant contractSubmits to DEQ for VSMP Construction Permit coverage for land
disturbing activitiesDevelops MS4 Implementation Plan
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PROGRAM ADMINISTRATION (Cont.)
2 Staff EngineersMS4 Steering Committee
L&D DivisionEnvironmental DivisionMaintenance DivisionTraffic Engineering DivisionTransportation Planning DivisionLearning CenterConstruction DivisionCommunications OfficeDistrict Construction RepresentativeDistrict Maintenance RepresentativeVCTIR RepresentativeMS4 Consultant
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PROGRAM ADMINISTRATION (Cont.)
SWM Program Policy Committee Deputy Chief Engineer Construction Division Administrator Maintenance Division Administrator Environmental Division Administrator Learning Center Administrator District Administrator Representative
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ADDITIONAL PROGRAM DETAILS
BUDGET $3.5 Million Annually
Does not include: • Project related cost• Cost covered by normal operationally expenses• Cost for any retrofit BMPs
MS4 CONSULTANT CONTRACT 3 Term Contract (Began April 2014) $3 Million maximum per term EEE Consulting (Prime)
Stantec (formerly WEG) and JMT (Subs)
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CHALLENGESor
OPPORTUNITIES THAT ARE CLEVERLY
DISGUISED
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VSMP CONSTRUCTION PERMIT Existing permit expires 6/30/14 New Permit begins 7/1/14 New permit approved by SWCB 12/13 New permit includes new/revised requirements for:
Construction inspection frequency SWPPP/SWM inspections P2 Plans (Pollution Prevention) P2 training for contractor personnel Requirements to meet EPA’s Effluent Limitation Guidelines (ELGs) Projects with coverage under current permit must reapply for coverage
under new permit by June 1 and SWPPPs must be updated within 60 days of new permit coverage to incorporate any new or revised requirements (includes projects under construction)
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MS4 PERMIT New Phase II General Permit effective 7/1/13 VDOT received coverage under the new permit on
11/1/13 Permit contains new requirements for the six
Minimum Control Measures (MCMs):o Public Education and Outreach
Identify 3 high priority water quality issues, develop an appropriate message and delivery to a target audience
o Public Involvement/ParticipationParticipate in 4 local SWM activities annually
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MS4 PERMIT (Cont.)
o Illicit Discharge Detection and Elimination (IDDE)Complete the storm sewer system outfall map and
information tables and make info available upon request
Complete and implement IDDE proceduresProvide for public reporting of potential illicit
discharge
o Construction Site Stormwater Runoff ControlNew inspection requirements P2 Plans and contractor training
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MS4 PERMIT (Cont.)
o Post Construction Stormwater ManagementNew water quality and quantity requirements and
compliance methods (Runoff Reduction and Energy Balance Equation)
New BMP selection list (BMP Clearing House Website)
o Pollution Prevention/Good Housekeeping for Municipal OperationsSWPPPs for high priority facilitiesP2 Plans for onsite operationsBiennial training for employees
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MS4 Permit (Cont.) Contains Special Conditions for addressing :
o Chesapeake Bay TMDLRequires determination of pollutant loads and required
reductions on developed lands prior to 2009Requires achieving 5% of total load reductions prior to
end of current permit cycle (6/30/18)
o Other TMDLs (Local)8 from previous permit – Continue implementation of
Action Plans14+/- new ones – Develop Action Plans
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OTHER ITEMS OF INTEREST
DEQ’S SWM CERTIFICATION PROGRAM Similar to ESC Certification Program except no exemption
for a professional license (P.E./L.A./L.S.) for initial Plan Reviewer certification
SWM Inspector & Plan Reviewer Certifications required by 7/1/14 for appropriate personnel
DEQ currently conducting 2 day Basic and 1 day Inspector classes
2 day Plan Reviewer Classes due in early Spring 2014 VDOT has received approval to conduct the training
classes for its internal employees and consultant contract personnel (training is currently underway for 600+ people)
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OTHER ITEMS OF INTEREST(Cont.)
SUPPORT FACILITIES – VSMP CONSTRUCTION
PERMIT COVERAGE Supplemental Specification (SS) finalized and was available
for inclusion in construction contracts beginning 9/13 Contractor develops plans & VDOT obtains permit
coverage for all facilities located within VDOT right of way or easement.
Contractor develops plans and obtains permit coverage for all facilities located outside VDOT right of way or easement
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OTHER ITEMS OF INTEREST(Cont.)
CURRENT RESEARCH ACTIVITIES (VCTIR) Lorton Road Project LID BMP Evaluations Maintenance Requirements for Permeable Asphalt
Pavement – Route 66/234 Park and Ride Lot Use of Nutrient Credit Banks to satisfy water quality
requirements for VDOT projects BMP Design Manual of Practice – Phase II
STANDARDS and SPECIFICATIONS Revised EC-5 Silt Fence Standards New Standard Sheets for Clearing House BMPs –
Construction Details, Specifications and Inspection Protocols (for construction and post construction)
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FIRST INTERMISSION
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STORMWATER REGULATIONS
IN VIRGINIA
AND
NEW VSMP TECHNICAL CRITERIA
(PART IIB)
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STORMWATER REGS IN VA
Clean Water Act/NPDES Industrial SW GP Construction SW GP MS4: Phase I Ind., Phase II GP
State Regulatory Programs Va SW Management Permit
Statewide
Erosion and Sediment ControlStatewide
Chesapeake Bay PreservationTidewater
2014 VSMP Regulation Changes
New Construction GP
Water Quality Criteria
Water Quantity Criteria
Local Programs
Stormwater Criteria Address Land Use Changes as a Result of Development
Land Disturbance Activity regulated
under federal regulation
Pre-development – non-regulated land
use
Post-development – non-regulated
land use
The water quality and quantity design criteria are implemented in conjunction with the VSMP General Permit for Stormwater Discharges from Construction Activities. These criteria are based on a State regulation separate from federal requirements.
Water Quality: Key Differences
Existing Rules
Impervious Surface (IC) only
0.5 inches of Runoff from the IC only
Average land condition/
technology based
10% reduction TP
Simple Method
Modified Rules
IC + Forest/Open Space + Managed Turf
1.0 inches of Rainfall from the whole site
0.41 lbs./ac/yr TP
<1 acre = 10% red. TP,>1 acre = 20% red. TP
Runoff Reduction Method (RRM)
Land Use(s)
Event
New Design Criteria
Redevelopment Criteria
Compliance Methodology
“Traditional” BMP pollutant removal efficiencies do not take into account the removal that occurs when the runoff volume is reduced.Many BMPs do not reduce runoff volume at all.
Current Methodology
Using BMPs that also provide volume reduction provides greater overall pollutant (mass load) removalThis reflects a “Mass Balance” Approach
Runoff Reduction Method
New Design CriteriaEnvironmental Site Design
There is no longer a specified “Average land cover condition” (% Imp. Cover or Poll. Load) below which you are not required to meet any water quality requirements
“Site” is redefinedImagine the site as an area that you can put construction fencing around ,but including undisturbed areas that are going to be protected as part of the plan.
Stormwater Offsets Program
Current Program to Offset Phosphorus Design Requirement Offsite
Flexibility for Developers DEQ Approved Perpetual Credits
James, York, Rappahannock, Potomac
Local Water Quality Limitations Same or Adjacent 8 Digit HUC Same Basin In Bay Watershed Only New Regulations Pending
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Water Quantity Criteria
Past approaches in urban stormwater hydrology focused on
Peak Flow
Flooding
Velocity
The new paradigm is
Volume-Based Hydrology (VBH)
The Energy Balance Method
The longer and stronger the force acts, the more sediment is moved.
The ENERGY ENERGY BALANCE METHODBALANCE METHOD is based on the interaction of both flow volume and peak discharge, which determine the stream channel configuration
Revised Stormwater Management Handbook
The draft Revised Stormwater Management Handbook can be found at DEQ’s web-site.
Developed to provide additional guidance to accompany the regulations.
Contains chapters with example problems
SECOND INTERMISSION
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VDOT’s MS4 TMDL Program
Tracey Harmon
Water Quality Permits Manager, Environmental Division
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TMDLs with VDOT WLA
2008 PH. II Permit• 8 TMDLs in MS4 areas with WLA assigned to VDOT
Stroubles Creek - sediment
Crab Creek – sediment & bacteria
Opequon Creek & Abrams Creek – sediment & bacteria
Bull Run − sediment
Popes Head Creek − sediment
Goose Creek − sediment
Roanoke River − sediment & bacteria
Potomac River − PCB
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Local TMDL Study Template
Justification Memo
Outfall Recon
Facility Evaluation
Calculate Contributing Acreage
Develop Annual Characterization• Estimate Stormwater Volume• Estimate Pollutant of Concern (POC)
BMP Selection Process
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Popes Head
Creek
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Popes Head
Creek
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Popes Head
Creek
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Popes Head
Creek
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Popes Head
Creek
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Transportation Approach
Impervious Estimates
“Roadway” LU type = 100% impervious• vs. TMDL’s NLCD data (eg. LDR = 35%)
ROW Estimates
Based on GIS & aerial photo• vs. TMDL Contributing Acreage
Watershed Treatment Model (WTM)
Non-structural & Structural BMPs• vs. TMDL Model (GWLF, HSPF)
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Transportation Approach
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Transportation Example
NLCD Example
BMP Selection Process
Based on % reduction from TMDL• MS4 Core Program Credit
40% reduction sediment• Additional Reductions Needed
Evaluate Applicable BMPs for POC• Determine Efficiency Ranking• Determine Cost Ranking
Select BMPs based on Cost-Effectiveness
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BMP Selection Example
WLA % reduction for POC = 72%
Apply Core BMP Credit
32% Additional Reductions Needed
Structural & Non-Structural BMPs
Highest Efficiencies
Lowest Costs
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Non-Structural BMPs
Riparian forest buffer
Catch basin clean out
Street Sweeping
Tree Planting (open space to forest)
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Structural BMPs
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BMP Rankings
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BMP Cost Score Removal Score Final Score
Street Sweeping 91 3.5 313.8
Grassed Filter Strips 91 0.7 63.1
Dry Swale (bio, WQ ) 88 0.6 50.9
Catch basin clean out 91 0.4 40.4
Wetland 90 0.4 39.3
Grass (open) Channel 88 0.4 32.1
Wet Swale 88 0.4 32.1
Retention (wet) Pond 90 0.2 13.9
Dry Extended Detention Pond 84 0.2 12.9
Bioretention 80 0.1 11.2
Example
Selected BMP Options
Vacuum-Assisted Street Sweeping
Street Sweeping plus Grassed Filter Strips
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Street-Sweeping BMP
2850 acres of roadway
Or equivalent street miles of ROW
Vacuum-assisted street sweeper
Map of Roads to Sweep
Documentation
Tipping Fee Receipts
Spreadsheet
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Street-Sweeping Tabulation Sheet
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TMDLs with VDOT WLA
2013 PH. II Permit• 23 TMDLs in MS4 areas with WLA assigned to
VDOT
Original 8 plus,
•Chickahominy R –Bacteria •Lower Accotink Creek – Bacteria
•James R (Richmond) – Bacteria •Neabsco Creek – Bacteria
•Difficult Run – Bacteria, Sediment •Occoquan R – Bacteria
•Hoffler Creek – Bacteria •Rivanna R - Bacteria, Sediment
•Hunting Cr, Cameron Run, Holmes Run – Bacteria
•Tidal Fresh Rappahannock R – Bacteria
•James R (Lynchburg) – Bacteria •Tidal Four Mile Run - Bacteria
•Chesapeake Bay – Sediment, N, P
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Next Steps
Continue/Update Existing Action Plans
Develop Action Plans
14 new local TMDLs
Chesapeake Bay TMDL
Identify Outfalls, BMPs, Facilities, ROW in 2010 Census Urban Area expansions
Share data and findings w/other MS4s
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