Creating a Storm Water Pollution Prevention Plan

1
Creating a Storm Water Pollution Prevention Plan

• For Construction Activities

2
Creating a Storm Water Pollution Prevention Plan

• A requirement of the construction storm water
  permit is to develop a storm water pollution
  prevention plan (SWPPP) before construction
  activities begin. The SWPPP should be complete
  before submitting the Notice of Intent (NOI).
  The following slide show will step through each
  item that is to be addressed in the SWPPP. By
  following this guide, you will be able to develop
  a SWPPP that fulfills the requirements of the
  Arkansas Department of Environmental Quality.

3
SWPPP Organization Guideline

• Site Evaluation and Design Development
• Collect site information
• Develop Site Plan
• Prepare pollution prevention site map

4
SWPPP Organization Guideline

• Assessment
• Measure the site area
• Determine the drainage areas
• Calculate the runoff coefficient

5
SWPPP Organization Guideline

• Control Selection / Plan Design
• Select erosion and sediment controls
• Select other controls
• Select storm water management controls
• Indicate the location of controls on the site map
• Site map requirements

6
SWPPP Organization Guideline

• Control Selection / Plan Design Continued
• Prepare an inspection and maintenance plan
• Prepare sequence of major activities
• Incorporate State or local Requirements

7
SWPPP Organization Guideline

• Certification / Notification
• Certify the plan
• Submit Notice of Intent
• Plan location

8
SWPPP Organization Guideline

• Construction / Implementation
• Implement controls
• Inspect and maintain controls
• Update / change the plan
• Report releases of reportable quantities

9
SWPPP Organization Guideline

• Final Stabilization / Termination
• Final stabilization
• Notice of Termination

10
SWPPP
The following is a step-by-step description of
each item in the organizational list that was
previously supplied. By addressing each item in
the list, an acceptable SWPPP can be developed
that meets ADEQs basic criteria.
11
Site Evaluation and Design

• Collect site information
• Existing conditions site map
• Soils information
• Runoff water quality
• Name of receiving stream / water
• Rainfall data

12
Site Evaluation and Design

• Develop Site Plan
• Disturb the smallest vegetated area possible
• Keep the amount of cut and fill to a minimum
• Limit impacts to sensitive areas such as
• Steep and / or unstable slopes
• Surface waters, including wetlands
• Areas with soil is likely to erode
• Existing drainage channels

13
Site Evaluation and Design

• Prepare Pollution Prevention Site Map
• Approximate slopes after grading
• Indicate areas of soil disturbance
• Indicate drainage patterns

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Assessment

• Measure site area
• Indicate the total site area and the area which
  will be disturbed

15
Assessment

• Determine the Drainage Area
• Measure the size of each drainage basins for each
  point where concentrated flow will leave the site
• Use the calculated concentrated flow to determine
  the appropriate sediment control measures

16
Assessment

• Calculate the Runoff Coefficient
• Develop an estimate of the developments impact
  on runoff after construction is complete. This
  can be done by estimating a runoff coefficient
  for post-construction conditions
• Q (C) (I) (A)
• where
• Q the rate of runoff from an area
• C partial amount of the total rainfall
• that will become runoff
• I rainfall intensity, and
• A the area of the drainage basin

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Assessment Continued

• Calculate the Runoff Coefficient Continued
• Calculating a weighted runoff coefficient

where A acres and C coefficient
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Assessment Continued
19
Control Selection / Plan Development

• Select erosion and sediment controls
• Stabilization measures for disturbed areas
• Structural controls to divert runoff and remove
  sediments
• Erosion and sediment controls can include
  temporary or permanent measures

20
Control Selection / Plan Development

• Select other controls
• Proper waste disposal
• Control of offsite vehicle tracking
• Compliance with applicable State or local waste
  disposal
• Sanitary sewer or septic system regulations
• Control of allowable non-storm water discharges

21
Control Selection / Plan Development

• Select storm water management controls
• Storm water detention structures (including wet
  ponds)
• Storm water retention structures
• Open vegetated swales
• Natural depressions
• Infiltration measures

22
Control Selection / Plan Development

• Indicate location of controls on the site map
• Areas of permanent seeding
• Areas of sod stabilization
• Silt fence
• Straw bale barrier
• Earth dikes
• Brush barriers
• Drainage swales
• Sediment traps

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Control Selection / Plan Development

• Indicate location of controls on the site map
• Pipe slope drains
• Level spreaders
• Storm drain inlet protection
• Reinforced soil retaining systems
• Gabions
• Temporary or permanent sediment basins
• Stabilized construction entrances

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Control Selection / Plan Development

• Site map requirements
• Drainage patterns
• Approximate slopes after grading
• Area of soil disturbance
• Location of major structural and nonstructural
  controls
• Areas where stabilization practices are expected
  to occur
• Location of surface waters

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Control Selection / Plan Development

• Prepare an inspection and maintenance plan
• Qualified personnel shall inspect disturbed areas
  of the construction site at least once every
  seven calendar days and within 24 hours of the
  end of a storm that is 0.5 inches or greater
• A description of procedures to maintain in good
  condition and effective operating condition
• Vegetation
• Erosion and sediment control measures
• Other protective measures identified in the site
  plan

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Control Selection / Plan Development

• Prepare sequence of major activities
• The sequence of major activities should include a
  timeline for
• Construction of control measures
• Earth disturbing construction activities
• Maintenance activities for control measures in
  the order in which they will occur
• Down slope and side slope perimeter controls
  should be installed before the land disturbing
  activity occurs
• Do not disturb an area until it is necessary for
  construction to proceed
• Cover or stabilize as soon as possible

27
Control Selection / Plan Development

• Prepare sequence of major activities continued
• The sequence of major activities should include a
  timeline for
• Time activities to limit impact form seasonal
  climate changes or weather events
• Construction of infiltration measures should be
  delayed to the end of the project when upstream
  drainage areas have been stabilized

28
Control Selection / Plan Development

• Incorporate state or local requirements
• Permittees shall incorporate all applicable
  requirements specified in State or local sediment
  and erosion control plans or permits, or storm
  water management plans or permits. This should
  include requirements such as
• City ordinances
• City grading permit requirements

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Certification and Notification

• Certify the Plan
• Your NPDES storm water permit requires that
  authorized representative(s) of the operator(s)
  sign and certify the plan. The authorized
  representative(s) should be individuals at or
  near the top of the management chain, such as
• The president
• Vice-president
• General partner, who has been delegated the
  authority to sign and certify this type of
  document

30
Certification and Notification

• Notice of Intent
• You are required to submit a Notice of Intent
  (NOI) prior to commencement of construction
• The NOI cannot be submitted until the SWPPP has
  been prepared

31
Certification and Notification

• Plan location
• SWPPPs for construction activities shall be
  maintained onsite of the activity unless the
  Director, or authorized representative, the
  operator of a large or medium MS4, or a State or
  local sediment and control agency requests that
  the plan be submitted.
• Permittees should keep a copy of the plan at the
  construction site until the site is finally
  stabilized
• Permittees are required to keep the plan, all
  reports and data for at least three years after
  the project is complete

32
Construction / Implementation

• Implement controls
• The controls should be constructed or applied in
  accordance with State or local standard
  specifications
• If there are no State or local specifications for
  control measures then the controls should be
  constructed in accordance with good engineering
  practices
• Improperly installed controls can have little or
  no effect and may actually increase the pollution
  of storm water

33
Construction / Implementation

• Inspect and maintain controls
• Inspection should be performed at the frequency
  specified in the SWPPP and / or the permit
• The inspector should note any damage or
  deficiencies in the control measures in an
  inspection report
• The inspector should correct damage or
  deficiencies as soon as practicable after the
  inspection
• The operator should keep records of the
  construction activity on the site, such as
• Dates when major grading activities occur in a
  particular area
• Dates when construction activities cease in an
  area
• Dates when an area is stabilized

34
Construction / Implementation

• Update / change plans
• SWPPPs are developed based on site-specific
  features and functions. Where there are changes
  in design, construction, operation, or
  maintenance, and that change will have a
  significant effect on the potential for
  discharging pollutants in storm water at a site,
  the SWPPP should be modified by the permittee to
  reflect the changes and new conditions
• The permittee is required to update the plan as
  necessary to reflect any changes onsite which may
  affect the potential for discharges of pollutants
  from the site

35
Construction / Implementation

• Releases of reportable quantities
• If the construction site has a release of a
  hazardous substance or of oil in an amount which
  exceeds a reportable quantity (RQ) as defined at
  40 CFR Part 110, 40 CFR Part 117, or 40 CFR Part
  302, then the permittee shall do several things
• The person in charge of the site at the time of
  the spill shall call the National Response Center
  to report the spill 800-424-8802
• Within 14 days after the release is detected,
  modify the site SWPPP
• Within 14 days of the release, submit a written
  description of the release to ADEQ

36
Final Stabilization / Termination

• Final stabilization
• A site can be considered finally stabilized when
  all soil disturbing activities at the site have
  been completed and a uniform perennial vegetative
  cover with a density of 70 percent for the
  unpaved areas and areas not covered by permanent
  structures has been established or equivalent
  permanent stabilization measures have been
  employed

37
Final Stabilization / Termination

• Notice of Termination
• The Notice of Termination (NOT) is the final task
  required to comply with the requirements of an
  NPDES storm water permit for a construction
  activity. The NOT form is sent to the permittee
  with the confirmation letter. Additional NOTs
  can be obtained by contacting the storm water
  staff at ADEQ