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Department of Public Works
Stormwater NPDES Compliance
Designer Training
September 3, 2020
Presenters
Gail Boydston
MS4 NPDES Coordinator
Kathy Allen
DPW Contractor
• Legal Requirements
• Importance
• Construction
• Post-Construction
• Lessons Learned
• Questions
Agenda
• MS4 NPDES Phase I Permit
• City Stormwater Manual
• Rule 5
Legal Requirements
Importance
Water Quality
• Recreation
• Animals & Plants
• Drinking Water
• Community Pride
• Economics
Construction
• INDOT RSP
• IDEM Rule 5
• Utility Coordination
• Inlet Protection
• Culverts
• Bridges
INDOT RSP 205-R-706
• Projects with 205 pay items
• Unit prices for E&SC
• Provide only 2 pay items
Construction
INDOT RSP 205-R-706Use unit prices in the RSP to build the
budget
Storm Water Management Budget items:
• Temporary silt fence (lft)
• Temporary inlet protection (each)
• #2 stone for construction entrance (ton)
• Riprap check dams (each)
Construction
INDOT RSP 205-R-706Storm Water Management Budget items:
• Manufactured surface protection product (erosion control blanket)
• Temporary seed & mulch• Mob & Demob for stabilization (duration,
phasing)• Estimate CYD sediment removal based on
duration of the project, # measures• Measurement for the installation - common
excavation (205.11)
Construction
INDOT RSP 205-R-706Storm Water Quality Control Plan (SWQCP)
Preparation and Implementation
• Prepared by contractor
• In tandem with the SWPPP or E&SC plan
• Contractors bid on this item
• For cost estimate:
– SWQCP preparation (preparer: PE & CPESC)
– Weekly and Post Rain event inspections
Construction
INDOT RSP 205-R-706Concrete Washout
• RSP includes washout for items such as mortar,
grout, saw cutting, dewatering contaminated
from concrete pours, hydrodemolition, and
similar operations.
• Note and/or detail on plans
Construction
IDEM Rule 5
• Construction General Permit
• 1+ Acre Disturbance
• IDEM SWPPP Guidance
– A: Project Information (23)
– B: Construction (15)
– C: Post-Construction (5)
• E&SC Plan for < Acre Disturbance
Construction
IDEM Rule 5
• SWCD reviews SWPPPs
– 30 days
– Time for comments
Construction
IDEM Rule 5
• NOI electronic submittal
– Required for DPW projects
– IDEM ePortal
– Must have DPW PM email
– DPW PM must be a city employee
– Automatic emails sent to DPW PM
• Public Notice
Construction
Utility Coordination Process
• Process & documents on website
• Project Stakeholder List
– Download new list EACH time
• NPDES review is EPA commitment
• Level 1 or Level 2 project
Construction
Inlet Protection
• Time for water to pool and sediment to drop
– Doesn’t impede active traffic
– Must have overflow
– Maintainable (Without dropping sediment into
the storm sewer)
• Downslope from project area
Construction
Culverts
• Direct Impact to Streams
• Pump arounds
– Coffer dams
• non-erodible
• entire project
• elevation
– Dewatering vs. pump around
Construction
Bridges
• Direct Impact to Streams
• Constructability & Sequencing
– Access drives
– Scour protection around piers
– Dewatering
– Demolition
Construction
• When are BMP’s Required
• Changes to Stormwater Manual
• O&M Considerations
• O&M Manuals
Post-Construction
When are BMP’s Required
• 1/2 acre+ disturbance
– Milling is not disturbance
– FDR is disturbance
• MS4 NPDES permit requirement
• When not practicable
– Consult with DPW PM
– Document decision
Post-Construction
Changes to Stormwater Manual
• Comprehensive update
• Incorporation of many INDOT standards
• Chapter 700
– no inlet filters
• Effective 2021 (anticipated)
– After DPW Board Adoption
– Q1 or Q2
Post-Construction
O&M Considerations• Operations on Project Stakeholder List
• Inlet filters and sumps high maintenance
• Cleanout ports 8+”
• Avoid travel lanes
• Biofiltration requires a contract
• Permeable pavers as last resort– Not approved BMP
– Consider loading (tree cover/type, erosion, mulched beds)
Post-Construction
O&M Manuals
• Quality and quantity features
• Locate on a plan
• Inspection and Maintenance frequency
• Include a Checklist (new Chapter 100)
• Submit with plans & at closeout with
record drawings
Post-Construction
• Utility Coordination
– Use new list
– Resend for ‘shelved’ projects
• SW Budget
• O&M Manuals Required
Lessons Learned
• Structure access size
– Size accordingly
– 22” much lighter than 27 7/8”
• ID on lids for Manufactured BMPs
• Specify topsoil for detention basin slopes
• Access drives for basins
Lessons Learned
Questions?
Gail Boydston
Kathy Allen
