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The Storm Water Pollution Prevention Plan SWPPP

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The Storm Water Pollution Prevention Plan. SWPPP. Sante Fe. M. D. Smolen. Biosystems and Agricultural Engineering. Oklahoma State ... NM NPDES Manual (2002) ... – PowerPoint PPT presentation

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Title: The Storm Water Pollution Prevention Plan SWPPP


1
The Storm Water Pollution Prevention PlanSWPPP
M. D. SmolenBiosystems and Agricultural
EngineeringOklahoma State UniversityJune 11,
2003
Sante Fe
2
NPDES General Permits
  • What is NPDES
  • Point sources vs. nonpoint sources
  • General permits vs individual permits
  • Phase I and phase II
  • Requirements of the Plan
  • Developing the SWPPP
  • The Temporary Erosion and Sediment Control Plan
    (TESCP)
  • Certifications, NOIs, NOTs, inspection, record
    keeping
  • Do the plan
  • Considerations

3
NPDES National Pollution Discharge Elimination
System
  • The permit system developed for point sources,
    discharge pipes and outfalls.
  • Extended to storm water runoff (in 1992) because
    water comes out a pipe or manmade conveyance.
  • Extended to Concentrated Animal Feeding
    Operations in 1993.
  • Blurring the demarcation between point and
    nonpoint sources.

4
Point vs. Nonpoint Sources
  • Point sources are regulatory
  • Discharge from a pipe or man-made conveyance.
  • Governed by discharge permits under NPDES.
  • Nonpoint sources are voluntary.
  • Diffuse sources
  • Not from a pipe or man-made conveyance.
  • Rainfall-runoff driven
  • Storm water
  • Defined as point source
  • Like a permitted nonpoint source
  • Agriculture generally is exempt from storm water
    rules.

5
The General Permit
  • The permit is permission to discharge.
  • Technology based runoff sampling is not
    required.
  • No effluent concentration specified
  • Compliance a good plan with evidence that it
    was followed.
  • Work can start 2 days after the NOI is submitted
    (no wait for approval).
  • Changes can be made without EPA approval.
  • An individual permit is much worse!

6
Storm Water Phase II
  • Phase I started 1992
  • Cities over 100,000
  • Construction sites over 5 acres
  • Phase II started March 10, 2003
  • Cities and other drainage utilities with
    population density greater than 1000 people per
    square mile
  • Construction sites over 1 acre

7
Requirements of the Permit
  • Notice of Intent (NOI)
  • Filed after SWPPP is developed
  • Filed 2 days before any grading or clearing
  • The Highway Dept and contractor may each have to
    file NOI (co-permittees)
  • The Temporary Erosion and Sediment Control Plan
    (TESCP)
  • May be altered for changes in construction
  • Stabilization requirement
  • Inspection requirement

8
Requirements of the Permit
  • Stabilization (cont.)
  • There is an exemption available for the dry
    period in arid or semi-arid regions.
  • Storm water basin
  • Detention basin is required for disturbed area of
    10 or more acres.
  • Size of basin 2-year, 24-hr runoff for each acre
    disturbed.

9
Requirements of the Permit
  • Smaller basins and traps may replace the sediment
    basin.
  • Include all support areas in SWPPP borrow areas,
    concrete or asphalt plants, staging areas, and
    disposal areas.
  • Spill notification
  • Retention of records
  • SWPPPP MUST BE ON SITE.
  • Post the permit number on site.
  • Keep records for three years.
  • NM NPDES Manual (2002),
  • At a minimum, silt fences or equivalent
    controls are required on all sideslopes and
    downslope boundaries of the site.

10
Requirements of the Permit
  • Inspection
  • Every 14 days and after 0.5 rain
  • (there are exemptions for dry period in
    arid/semi-arid areas)
  • Maintenance
  • Required within 7 days of inspection

11
Developing the SWPPP
  • Site map is required to scale and topographic
    (should show all important features).
  • Soils information from NRCS Soil Survey for
    textures, hydrologic group, natural cover,
    Ecological Site guides (show what vegetation is
    expected)
  • Runoff water quality if data exist
  • Check USGS and state agencies
  • Name of receiving water

12
Developing the SWPPP
  • Identify the limits of disturbance for each phase
    of project.
  • Measure the disturbed area for each phase of
    project.
  • Locate basin for 10 acres or more disturbed.
  • Locate inlet devices and traps.
  • Describe the construction activity and phasing.
  • Identify sensitive areas
  • steep/unstable slopes
  • Affected waters
  • Existing drainage
  • Erodible soils
  • Natural channels that need protection

13
Developing the SWP3
  • Determine the drainage pattern where does the
    water go and where will it go.
  • Determine the drainage area for all controls
    (very important but not required in SWPPP!).
  • Estimate impact on runoff after construction is
    complete (C-factors).
  • Select erosion and sediment control measures,
    including stabilization measures.
  • Select controls for any other pollutants (oils,
    pesticides, debris).
  • Plan for dust control.
  • Dissipate energy (high velocities generated by
    culverts and some lined ditches).

14
Developing the SWPPP
  • Show slopes after grading.
  • Show direction of flow, indicating where water
    leaves the site.
  • Indicate location of controls.
  • Prepare the inspection and maintenance plan
    (showing qualification of the inspectors)
  • Address state or local requirements.
  • Certifications operator, contractors, and
    subcontractors
  • List all contractors and subcontractors
  • They must sign (certify) that they understand the
    permit requirements.

15
The NOI
  • Name and address of operator
  • Location of the construction site latitude and
    longitude
  • Description of the site
  • Name of receiving water
  • Estimated start date
  • Likelihood of discharge

16
Notice of Termination
  • Any contractor who has submitted NOI must submit
    NOT when they are done.
  • Final NOT from operator is submitted when work is
    complete and stabilization is complete.
  • All NOTs must reference the same project and
    indicate if they are no longer the operator or if
    SWPPP is being terminated.
  • Final NOT requires 70 of vegetation or
    equivalent stabilization measures.

17
Do your plan
  • Establish the perimeter and the drainage pattern.
  • Where can water leave the site.
  • Locate controls.
  • Use temporary diversions where appropriate.
  • Phase the grading.
  • Establish traffic pattern.
  • Protect cut and fill slopes.
  • Stabilize surfaces.
  • Inspect and maintain the system.

18
Consider
  • Identify on-site water and off-site water.
  • Do not block water coming through the site.
  • Consider diversions.
  • Keep it clean by avoiding contamination with
    dirty water.
  • Protect work areas from water.
  • Dont block channels with piles of dirt.
  • Temporary diversions may work.
  • Make sure water is treated before it leaves the
    site.

19
More
  • Protect the cut or fill slopes
  • Make sure channels are stable (including
    temporary diversions).
  • Remove sediment before runoff leaves the site.

20
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21
Planning exercise
  • Determine the drainage pattern (pre- and
    post-construction).
  • Identify sensitive areas.
  • Develop phases.
  • Determine the traffic pattern.
  • Determine drainage pattern during construction.
  • Select erosion and sediment control measures,
    including stabilization.
  • Determine the drainage area for all controls.
  • Design controls, channels, and culverts.
  • Select controls for any other pollutants (oils,
    pesticides, debris).
  • Plan for dust control.
  • Dissipate energy (high velocities generated by
    culverts and some lined ditches).
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