Stormwater 101:
How to stay out of trouble with TDEC
Agenda
►
Who is covered by CGP?
► TBR construction site CGP compliance process
► CGP primer:
► Non-construction related stormwater issues
► Streams: What you can do around them and what you can’t
2
Construction General Permit
All disturbances ≥ 1 acre:
►
Regulated by TDEC
► Notice of Coverage
► Site-specific SWPPP
► Twice weekly inspections
► SWPPP updates
► Rainfall monitoring
► Site assessments
► Final stabilization
► Notice of Termination
3
Construction General Permit - TBR
Universities
• MS4 permit
• A/E firm:
• SWPPP, NOI
• twice weekly inspections
• NOT
• University:
• 3rd party SWPPP review
• monthly audit
4
Community colleges, TCATs
• A/E/ firm:
• SWPPP, NOI
• twice weekly inspections
• NOT
• CC, TCAT:
• Keep an eye on site
TBR Project
Designer
Design,
including
stormwater
List of
acceptable
practices
Design includes permanent
SW treatment practices
Plans review checklist
CGP
application
Design
guidance
TDEC NOC
As Built
Certification
form
As built
certification
Late 2015
Contractor:
twice weekly
inspections
Standard
operation and
maintenance
plans
Maintenance
SOP by
campus
Construction
begins
Construction
complete
Long term maintenance
Monthly Audit checklist:
University Rep
Notice of Termination: TBR
Project Manager
Completed by consultant
TBR
Project submittal toDesigner
Before
TDEC
Design,
including
stormwater
List of
acceptable
practices
Design includes permanent
SW treatment practices
Plans review checklist
CGP
application
Design
guidance
TDEC NOC
As Built
Certification
form
As built
certification
Construction
begins
Contractor:
twice weekly
inspections
Standard
operation and
maintenance
plans
Maintenance
SOP by
campus
Construction
complete
Long term maintenance
Monthly Audit checklist:
University Rep
Notice of Termination: TBR
Project Manager
Discuss at Precon
NOC – post on job board
►
TNRXXX <- permit tracking number
Rainfall monitoring
Discuss at Precon
Twice weekly inspections
► Contractor to perform and document
► Documentation should stay with field
SWPPP
Site assessments
► Designer to perform
► PE, Landscape Architect, Certified
Professional in Erosion and Sediment
Control (CPESC), Certified Professional
in Storm Water Quality (CPSWQ),
TDEC Level II certified.
► Documentation should stay with field
SWPPP
TBR/University rep performs monthly
audits to ensure contractor and
designer are complying
TBR Audit
Rainfall depth and estimated storm duration should be
reported
Ex: 0.7 inches in 2.5 hours
2yr, 24hr or 5yr, 24hr storm
Google: NOAA Atlas 14
For TSU:
2.25 inches
in 1 hour
Tip: Print the
table at the
beginning of
construction and
put it with the
SWPPP
How do you use that?
Why did the measure
fail?
►
Large rain event that
exceeded the design
storm
► Poor maintenance
► Poor installation
► Too much drainage area
Helps the inspector give
recommendations
Site check
► Generally verify site conditions
match the inspection
documentation
TBR Project
Final stabilization = at least
70% coverage with
permanent ground cover
List of
acceptable
practices
Stormwater “how-to” for
TBR project managers
Designer
Design includes permanent
SW treatment practices
Design,
including
stormwater
Plans review checklist
CGP
application
Design
guidance
TDEC NOC
As Built
Certification
form
As built
certification
Construction
begins
Contractor:
twice weekly
inspections
Standard
operation and
maintenance
plans
Maintenance
SOP by
campus
Construction
complete
Long term maintenance
Monthly Audit checklist:
University Rep
Notice of Termination: TBR
Project Manager
Non-construction related SW issues
►
►
18
Illicit discharges
►
Only stormwater is allowed in stormwater system
►
Non-stormwater:
►
Coolant
►
Oil, grease
►
Cleaning fluids
►
Paint washup
Good housekeeping practices
►
Materials management
►
Fluids, solvents, materials that can mix with rainfall runoff should be stored
under cover or inside a building
►
Washout containers, wash vehicles on grassy surfaces
Streams
• Routine maintenance
• Mow, remove vegetation
• Construction related
• Cannot remove vegetation
• Can mow grasses (not bush hog)
• Permits required:
• To realign stream
• To cross stream (roads)
• Ditch or Stream?
• Get a stream determination by Qualified Hydrologic Professional or
TDEC – don’t guess!
19
Questions?
20