Chapter 7 - Post-Construction Run-off Control MCM
7.0
Introduction
This
chapter describes the post-construction run-off control
minimum control measure, the fifth of six measures the
operator of a Phase II regulated small municipal
separate storm sewer system (MS4) is required to include
in its stormwater management program to meet the
conditions of its National Pollutant Discharge
Elimination System (NPDES) permit.
Post-construction stormwater management in areas
undergoing new development or redevelopment is necessary
because run-off from these areas has been shown to
significantly affect receiving waterbodies. Many
studies indicate that prior planning and design for the
minimization of pollutants in post-construction
stormwater discharges is the most cost-effective
approach to stormwater quality management.
Each
section of this plan describes a Best Management
Practice (BMP). Each BMP is accompanied by its own
implementation schedule. The implementation schedule
informs the MS4 Operator and their designated personnel
of the tasks to complete for each year. The MS4
Operator will require that the parties responsible for
each post-construction site stormwater run-off control
record and report annually on the items to be tracked so
that the MS4 Operator may include them in the annual
report to IDEM.
Measurable Goal:
The post-construction stormwater run-off control program
aims to reduce the amount of total suspended solids
leaving any new site development after construction has
been completed by 80%. The goal is to achieve 80%
reduction for all new site developments required to gain
local approval.
The
following is the post-construction stormwater run-off
control program.
7.1
Development of a Regulatory Mechanism
The
purpose of the regulatory mechanism for
post-construction stormwater run-off control is to
establish minimum stormwater management requirements and
controls to protect and safeguard the general health,
safety, and welfare of the public residing in watersheds
within the MS4 area once construction activities have
ceased.
The City of Logansport will use an overall Stormwater
Ordinance with a Chapter titled Control of Post
Construction Stormwater Runoff for its regulatory
mechanism. Through the Ordinance the MS4 Operator will
implement planning procedures to promote improved water
quality.
Planning procedures will include, at a minimum, the
post-construction requirements of 327 IAC
15-5-6.5(a)(8). The Ordinance may also include the
implementation of the following planning procedures
identified in Rule 13 (327 IAC 15-13-16(b)).
-
Buffer strip preservation and riparian zone
preservation;
-
Creation of filter strips;
-
Minimization of land disturbance;
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Minimization of impervious surfaces;
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Disconnecting impervious surfaces;
-
Maximization of open spaces; and
-
Avoiding sensitive areas.
7.1.1 Implementation Schedule
The
implementation of the City's post-construction run-off
control regulatory mechanism otherwise referred to as
the Post-Construction Run-off Control Chapter of the
Stormwater Ordinance will be the responsibility of the
MS4 Operator who will pursue the following schedule:
Year 1 (ending Nov 2004):
Develop a draft Chapter for post-construction runoff.
The City will submit the draft Chapter to DNR for their
review and comments.
Year 2 (ending Nov 2005):
Update the Post-Construction Run-off Control Chapter as
necessary. The City will then adopt the Chapter as part
of the Stormwater Ordinance before November 1, 2005, and
complete a certification form that combines the
completed requirement of this subsection and subsection
7.4, the development of an Operational and Maintenance
Plan for all structural BMPs.
Year 3 (ending Nov 2006):
Review the Post-Construction Run-off Control Chapter and
note any suggested improvements. Update the Chapter and
amend the Stormwater Ordinance as necessary.
Year 4 (ending Nov 2007):
Review the Post-Construction Run-off Control Chapter and
note any suggested improvements. Update the Chapter and
amend the Stormwater Ordinance as necessary.
Year 5 (ending Nov 2008):
Review the Post-Construction Run-off Control Chapter and
note any suggested improvements. Update the Chapter and
amend the Stormwater Ordinance as necessary.
7.1.2 Items to be Tracked
The
following items will be recorded on the corresponding
reporting form located at the end of this chapter.
-
Number
and names of new employees trained in stormwater quality
related policies and procedures; and
-
Number
and names of current employees trained in stormwater
quality related policies and procedures.
7.2
Site
Plan Review Process
The site
plan review process will be generally described in the
Ordinance and more detail will be provided in the City of
Logansport's Development Manual.
The site
plan review process will be written to be in accordance with
327 IAC 15-13 and 327 IAC 15-5. According to 327 IAC 15-13,
the permitting process and associated timetables for site
plan and application submittals listed in 327-IAC 15-5 do
not have to be followed. The City of Logansport will
develop standardized timetables for all site plan reviews
and application submittals.
The City
of Logansport has not delegated responsibility to the SWCD
to review all site plans submitted and inspect all sites.
Logansport has retained this responsibility. However, the
City will give the SWCD the opportunity to review each of
these plans prior to the City's approval of the submitted
plans. Failure of the SWCD to respond within a
predetermined time period should not delay final action of
the MS4 Operator to approve plans.
After
the City gives approval, the construction site operator is
responsible to submit a Notice of Intent (NOI) Letter to
IDEM.
For the
duration of the permit term, the SWCD will be given the
opportunity to review and inspect all MS4 operated
projects. Examples of MS4 operated projects include but are
not limited to new road and utility projects. Only after
the local SWCD Director gives written permission to the City
giving them the authority to perform self monitoring will
the MS4 Operator will no longer be required to submit MS4
operated projects to the SWCD for their review.
According to IAC 15-5, all site plan submittals must include
a post-construction stormwater pollution prevention plan.
In addition to the post-construction stormwater pollution
prevention plan requirements in IAC 15-5, the MS4 Operator,
where appropriate, will require the use of any combination
of storage, infiltration, filtering, or vegetative practices
to reduce the impact of pollutants in stormwater run-off on
receiving waters. In addition to combining any 's of the
above mentioned practices, the following requirements will
be followed:
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Infiltration practices will not be allowed in well-head
protection areas;
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Discharges from an MS4 area will not be allowed in sink
holes or fractured bedrock without treatment that
results in the discharge meeting Indiana ground water
quality standards as referenced in 327 IAC 2-11;
-
Any
stormwater practice that is a Class V injection well
must ensure that the discharge from such practices meets
Indiana ground water quality standards as referenced in
327 IAC 2-11;
-
As
site conditions allow, the rate at which water flows
through the MS4 conveyances will be regulated to reduce
outfall scouring and stream bank erosion;
-
As
site conditions allow, a vegetated filter strip at the
appropriate width will be maintained along unvegetated
swales and ditches;
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New
retail gasoline outlets, new municipal, state, federal,
or institutional refueling areas, or outlets and
refueling areas that replace their existing tank systems
will be required by MS4 ordinance or other regulatory
means to design and install appropriate practices to
reduce lead, copper, zinc and polyaromatic hydrocarbons
in stormwater run-off.
The City
will review all projects within the MS4 area. They may
choose to review projects within the extra-jurisdictional
area and provide comments to the extra-jurisdictional review
authorities for their consideration.
The MS4
Operator will be required to submit a monthly summary report
of construction projects to IDEM. This certification form
is located in
Appendix F, State Form 51276 (R3/
11-03).
7.2.1
Implementation Schedule
The
implementation of the development of Site Plan Review
Process will be the responsibility of the MS4 Operator who
will pursue the following schedule:
Year
1 (ending Nov 2004):
Incorporate stormwater quality plan review with current plan
review procedures for all site plans and site inspections,
as described above and in the City of Logansport's
Development Manual.
Year
2 (ending Nov 2005):
Review the site plan review process for all site plans and
site inspections and update as necessary.
Year
3 (ending Nov 2006):
Review the site plan review process for all site plans and
site inspections and update as necessary.
Year
4 (ending Nov 2007):
Review the site plan review process for all site plans and
site inspections and update as necessary.
Year
5 (ending Nov 2008):
Review the site plan review process for all site plans and
site inspections and update as necessary.
7.2.2
Items to be Tracked
The
following items will be recorded on the corresponding
reporting form located at the end of this chapter.
-
Number
of reviews by the SWCD;
-
Number
of sites authorized for stormwater quality;
-
Number
of sites inspected;
-
Number,
type, and location of structural BMPs installed;
-
Type
and location nonstructural BMPs utilized;
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Estimated acreage or square footage of open space
preserved and mapped;
-
Estimated acreage or square footage of mapped pervious
and impervious surfaces; and
-
Number
and location of retail gasoline outlets or municipal,
state, federal, or institutional refueling areas with
installed BMPs.
7.3
Annual
Training of MS4 Personnel
Current Employees:
Current employees responsible for plan review, inspection,
and enforcement of post-construction BMP's shall receive, at
a minimum, annual training addressing such topics as
appropriate control measures, inspection protocol, and
enforcement. This training will involve instruction on
inspection frequency, maintenance
procedures, operational testing or observations to ensure
proper functioning, preventative maintenance and record
keeping. This training will be documented. The
documentation will be retained by the City.
During
subsequent years, employees will be required to complete an
annual refresher training program. This training will be
documented. The documentation will be retained by the
City.
New
Employees:
New employees responsible for plan review, inspection, and
enforcement of post-construction BMP's shall receive, at a
minimum, annual training addressing such topics as
appropriate control measures, inspection protocol, and
enforcement. This training will take place within the first
two months of employment. This training will involve
instruction on inspection frequency, maintenance procedures,
operational testing or observations to ensure proper
functioning, preventative maintenance and record keeping.
This training will be documented. The documentation will be
retained by the City.
7.3.1
Implementation Schedule
The
implementation of training for MS4 personnel will be the
responsibility of the MS4 Operator who will pursue the
following schedule:
Year
1 (ending Nov 2004):
Approve the development of annual training for MS4 personnel
on post-construction stormwater run-off controls, as
described above.
Year
2 (ending Nov 2005):
Develop and implement training policy and procedures for
personnel training on post-construction stormwater run-off
controls. Begin training employees.
Year
3 (ending Nov 2006):
Continue training employees.
Year
4 (ending Nov 2007):
Continue training employees.
Year
5 (ending Nov 2008):
Continue training employees. Evaluate the policies,
procedures, and training methods; and begin implementing
recommended changes.
7.3.2
Items to be Tracked
The
following items will be recorded on the corresponding
reporting form located at the end of this chapter.
-
Number
and names of new employees trained in stormwater quality
related policies and procedures; and
-
Number
and names of current employees trained in stormwater
quality related policies and procedures.
7.4
Development of an Operational and Maintenance Plan for All
Structural BMPs
The MS4
Operator will develop and implement a written operational
and maintenance plan for all major structural stormwater
BMPs. Operational and Maintenance plans for specific
structural BMPs will be described in detail in the City of
Logansport's Development Manual.
Major
Structural BMPs included in the Development Manual include,
but are not limited to, detention basins and retention
basins.
In
situations where the structural BMP is privately owned, the
maintenance and operation of the BMP is the responsibility
of the private owner. In accordance with a maintenance
agreement that will be established in the Post-Construction
Run-off Control Ordinance, the private owner will be
required to properly maintain and operate the BMP in
accordance with the Stormwater Standards included in the
Development Manual.
The plan
for all MS4 operational areas will also include the
following:
Inspection Frequency:
Major structural stormwater BMPs such as detention and
retention basins will be inspected, at the minimum, on an
annual basis to document maintenance and repair needs.
Catch basins will be inspected in accordance with Section
8.1.2 of Chapter 8 – Pollution Prevention and Good
housekeeping MCM.
Maintenance Procedures:
Maintenance and repair needs identified during inspections
will be addressed in a timely manner. These needs may
include preventative maintenance activities such as the
removal of silt, litter and other debris, and grass cutting
or vegetation removal.
Recordkeeping:
All actions taken as required by this plan will be
documented. These actions include, but are not limited to,
records of installation or maintenance activities and
inspection reports. The documentation will be retained by
the City. This plan will be reviewed for adequacy and
accuracy at a minimum of every five years. Any changes to
the plan will be documented and incorporated into the annual
report.
7.4.1
Implementation Schedule
The
implementation of the Operation and Maintenance Plan will be
the responsibility of the MS4 Operator who will pursue the
following schedule:
Year
1 (ending Nov 2004):
Begin the development of an operational and maintenance plan
for all structural BMPs, as described above.
Year
2 (ending Nov 2005):
Complete the plan and a certification form that combines the
completed requirement of this subsection and subsection 7.1,
the Development of a Regulatory Mechanism.
Year
3 (ending Nov 2006):
Review the operation and maintenance plan and note any
suggested improvements. Update plan if necessary.
Year
4 (ending Nov 2007):
Review the operation and maintenance plan and note any
suggested improvements. Update plan if necessary.
Year
5 (ending Nov 2008):
Review the operation and maintenance plan and note any
suggested improvements. Update plan if necessary.
7.4.2
Items to be Tracked
The
following items will be recorded on the corresponding
reporting form located at the end of this chapter.
-
Number,
type, and location of structural BMPs inspected; and
-
Number,
type, and location structural BMPs maintained, or
improved to function properly.
-
Number
of stormwater drains stenciled, decaled or cast.
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