Construction Site Stormwater Runoff Review

Construction Site Stormwater
Runoff Review
Texas Pollutant Discharge Elimination System
(TPDES) General Permit TXR150000
This presentation is intended to aid in achieving compliance and should not be interpreted as
a comprehensive compliance source.
What are we
trying to prevent.
Stormwater History – Abilene
 September 11, 1998 – EPA issues first MS4
permit to the City of Abilene.
 August 23, 2003 - Stormwater Utility Division
created following the July 2002 flood and
EPA/TCEQ requirements.
 April 17, 2006 – TCEQ issues permit to the City
of Abilene. EPA permit no longer active.
What are the City’s requirements
under the MS4 permit?
 Monitor the use and maintenance of appropriate
structural and non-structural control measures.
 Inspect Construction sites and conduct
enforcement of control measures.
 Provide appropriate education and training.
 Notify building permit applicants of their potential
responsibilities under the TPDES permit.
Who is responsible for permit
Anyone with day-to-day operational control of activities
at a construction site.
 The person or persons that have operational control
over construction plans and specifications.
 Developers
 Builders
 Designers
 Contractors
 Sub-contractors
When is a construction site
permit required?
Large Construction Activity (Submit NOI)
Land disturbance of greater than 5 acres; or less than 5
acres but part of a larger plan of development.
– Sub-divisions
– Strip malls
Small Construction Activity (Submit CSN)
Land disturbance of greater than 1 acre and less than 5
acres; or less than 1 acre but part of a larger plan of
What are my requirements if I am
subject to the stormwater permit?
Develop a Stormwater Pollution Prevention Plan (SWP3)
according to the provisions of the General Permit (TXR150000).
Submit a Notice of Intent (NOI) to the City and TCEQ or Small
Construction Site Notice (CSN) to the City.
Post copy of NOI and Large CSN or Small CSN at site visible to
the public.
Implement SWP3 prior to beginning of construction activities.
Notice of Change (NOC)
Notice of Termination (NOT) – Site stabilization (70%)
Stormwater Pollution
Prevention Plan (SWP3)
 Completed prior to obtaining NOI/CSN.
 Implemented prior to construction activities.
 Updated/maintained as necessary (living
 Must provide compliance with terms and
conditions of the general permit.
 Must be made available to inspectors.
SWP3 (cont’d)
 SWP3 must contain at a minimum:
Nature of construction activity and potential pollutant sources.
Intended schedule of major activities of soil disturbance.
Total number of acres of the entire property and disturbed
Name of receiving water bodies that will receive discharges.
Copy of the TPDES general permit TXR150000.
SWP3 Site Map
Site map should illustrate the erosion/sediment controls;
A map showing general location of site (city or county map);
Drainage patterns and approximate slopes after major grading;
Areas where soil disturbance will occur;
Location of all major structural controls;
Locations of off-site materials, waste, equipment storage areas;
Surface waters, adjacent or in close proximity; and
Locations where stormwater will discharge from the site to a
surface water body.
Notice of Intent (NOI) or
Construction Site Notice (CSN)
 The NOI is to be submitted to the MS4 operator
and TCEQ after development of the SWP3.
 The NOI has a $225 electronic/ $325 standard
mail fee to the TCEQ while the CSN is no
 The CSN is to be submitted to the City of Abilene
Stormwater Utility Division only.
 Both are to be posted on-site.
Implementation of SWP3
 The SWP3 should be implemented prior to any
land disturbance.
 Erosion and Sediment controls in place.
 Changes can and should be made to the SWP3
at this time if implementation is modified from
original plans.
 Sediment Controls vs. Erosion Controls.
Silt Fence
Silt fence is a good
option for sediment
control but offers no
stabilization for erosion
 Must be installed
correctly and maintained!
Good Silt Fence
Bad Silt Fence
Bad Silt Fence
Good Silt Fence
Mulch Socks
Mulch sock is a good
option for sediment
control but offers no
stabilization for erosion
 Also, must be installed
correctly and maintained!
Mulch Sock
Rip Rap Entrance
Rip Rap or other entrance
control measures are
required to keep dirt and
other construction debris
from entering the road,
MS4, and waters of the
 Should be marked on the
Site Map and maintained.
Concrete/Paint Washout Pit
If disposal of concrete
residual is to be
discarded on-site, a
concrete washout area
should be designated
and maintained.
 Should be marked on the
Site Map in the SWP3.
Erosion Control Mats
Erosion control mats are
an efficient erosion
control and stabilization
 Must be maintained!
Storm Drain Inlet Protection
Protection of a storm
drain inlet is imperative
since these lead straight
to creeks.
 Many different methods
for protection of storm
Storm Drain Inlet Protection
Sediment and Erosion Control
Best Management Practices
 Be Innovative
 If it doesn’t work, fix it.
 Use common sense for each site.
 Keep dirt and construction debris out of the
street, water conveyances, and waters of the
Site Stabilization
Part of Post-Construction
permit requirements
 70% stabilization
 Must inform new
responsible party of
 Aesthetics!
Site is open to inspections
from the City, TCEQ,
and/or the EPA.
 City Ordinance will be
used by inspectors for
enforcement purposes.
Inspections by the City
 Inspections will be conducted by:
NOI/CSN submittal
Drive by visual recognition
After significant rain events.
 Inspections will be conducted under the TCEQ
General Permit regulations.
Inspections by the City
 Inspectors will be looking for:
NOI/CSN posting
Site conditions as established by the SWP3.
Erosion and Sediment control implementation and
maintenance and whether they are effective.
– City will have the authority to request modifications or
changes in BMP’s if not effective.
Inspection Enforcement
 The City will use the following schedule while
conducting inspections:
Voluntary compliance
Stop Work orders
Monetary fines
5 Deadly Sins from the EPA
 Dirt in the street
 Blowing trash
 Concrete/paint washout
 Leaks & Spills
 Poorly maintained BMP’s
Questions, comments, ideas?

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