Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
NDDOT Erosion & Sediment Control – Construction CourseModule 4: Stormwater Pollution Prevention Plan (SWPPP)
1
What’s covered in this module?
1. What is a SWPPP
2. Important initial considerations that affect the SWPPP
3. The main parts of the SWPPP
4. Permit requirements
2
Page 1
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the module’s learning objectives?
1. Identify initial considerations
2. Develop the SWPPP from the plans and Contractor operations and phasing
3
What is a SWPPP?
Definition:
A document, a plan that describes who and what will control erosion and keep sediment from leaving the project site, and when, where and how this will be done. The plan is the common link between the owner, designer, contractor, and inspector.
4
Page 2
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What is a SWPPP?
A SWPPP is a site-specific, written document.
− Identifies potential pollution
− Describes practices
− Identifies procedures
5
Why is a SWPPP important?
1. Required by the permits
2. Powerful tool to assist erosion and sediment control
6
Page 3
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Who is responsible for developing it?
Prime Contractor
Plan Designer
SWPPP
Design Plans
Project Implementation
7
Overview of SWPPP Development Process
Inspection, Maintain, and Record
Select Good Housekeeping ESC measures
Select ESC measures
Assess Site & Proposed Project
8
Page 4
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Initial Considerations
1. Existing conditions
2. Outfalls
3. Waterbodies
4. Project boundaries
9
Initial Considerations
5. Environmentally sensitive areas
6. Permanent stormwater controls
a. Ponds
b. Infiltration
7. Project phasing
10
Page 5
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Existing Conditions
Soils
Hydrology
Topography
11
Outfalls and Waterbodies
Considerations:
− Where does it drain to?
− How close will the disturbance be?
− What protections are required?
− Is it impaired? What for? Total Maximum Daily Load (TMDL)?
12
Page 6
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Project Boundaries
Considerations:
− Slopes
− Proximity to right of way lines
− What is coming into the project?
− Points of egress – trackout, etc.
− Impacts from or to outside
13
Environmentally Sensitive Areas
Rivers, Lakes, Streams:− Spawning times
Threatened and Endangered Species
Wetlands:− Impacts− Mitigation
Cultural sites and other avoidance areas
14
Page 7
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Permanent Stormwater Controls
What permanent structures are required?
− MS4
− City
− Are there any existing?
15
Permanent Stormwater Controls
Placement
Sizing
Maintenance
16
Page 8
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Project Phasing
What will be done first?
What should be done first?
Environmental commitments
Should things be required due to the nature of the work?
17
What are the components of a SWPPP?1. Illustrative:
a. Map/site planb. Detailsc. Drawings
2. Narrative:a. Contractors means and methods b. Plan notesc. Environmental commitments
3. Calculations and other supporting documents
18
Page 9
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the parts of the illustrative section in the SWPPP?1. Site map
2. Erosion and Sediment Control Measure (ESCM) installation drawingsa. Standard drawingsb. Plan detailsc. Manufacturer’s drawings/details
3. Other visual aids
19
What are the parts of a map/site plan in the SWPPP?
1. Vicinity map
2. North arrow
3. Existing contours
4. Preliminary and final design contours
5. Existing vegetation
6. Soils
20
Page 10
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the parts of a map/site plan in the SWPPP?
7. Critical areas
8. Existing and final drainage patterns
9. Limits of clearing and grading
10. Outfalls
11. Surface waters (including wetlands)
21
What are the parts of a map/site plan in the SWPPP?
12. Temporary ESCMs
13. Permanent ESCMs
14. Permanent stormwater management practices
15. Off site areas (if applicable)
16. Legend
22
Page 11
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Plan Sections
Section 75 – Wetlands
Section 76 – Temporary ESCMs
Section 77 – Permanent ESCMs
23
Page 12
Site Map Example
24
Page 13
ESCM Installation Drawings
25
Page 14
ESCM Installation Drawings
26
Page 15
ESCM Installation Drawings
27
Page 16
ESCM Installation Drawings
28
Page 17
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the parts of the narrative section in a SWPPP?
1. Site description
2. Operational controls
3. Erosion and sediment control measures
4. Stormwater management
5. Maintenance
29
What are the parts of the narrative section in a SWPPP?
6. Inspections
7. Plan review and revisions
8. Signatory requirements
9. Local requirements
10. Final stabilization
30
Page 18
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Site Description
1. Project description
2. Existing site conditions
3. Adjacent areas
4. Estimates of areas
5. Proposed timetable
6. Soils
7. Critical areas
8. Surface waters
9. 303(d) list information
31
Project Description, Existing Site Conditions, Adjacent & Estimated Areas
Who
What
Existing issues
Land uses
32
Page 19
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
A proposed timetable of activities that disturb soils for major portions of the site
33
Page 20
34
Page 21
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Soils
What types of soil?
Soil properties
Specific ESCMs due to soils
35
Critical Areas
Environmentally sensitive
Highly erosive
High flow
Time sensitive
36
Page 22
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Surface Waters and 303(d) list
Where does the site drain?
Multiple receiving waters
Impaired waters and the 303(d) list
Integrated Report
TMDLs
37
Operational Controls
1. Chain of responsibility
2. Good housekeeping practices
3. Preventative measure practices
4. Spill prevention and response procedures
38
Page 23
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Operational Controls
5. Training
6. Concrete waste control
7. Dewatering
39
Chain of Responsibility
Identify who will oversee:− SWPPP
− ESCM installation, inspection, maintenance and removal
Develop a Chain of Responsibility: − NOT JUST DOT and PRIME CONTRACTOR
40
Page 24
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Good Housekeeping Practices
Litter
Construction debris
Chemicals
Human waste
Vehicle fueling/maintenance
Vehicle washing
41
Trackout and Dust Control
Soils
Particular ESCMs
Practices
Locations
Plan for cleaning
42
Page 25
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Preventative Measure Practices
Stormwater control devices
− Operation
− Inspection
− Maintenance
43
Preventative Measure Practices
Equipment and vehicles
− Operation
− Inspection
− Maintenance
44
Page 26
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Spill Prevention and Response Procedures
Specific handling procedures
Storage requirements
Spill containment
Cleanup procedures
Use Spill Prevention, Control and Countermeasure (SPCC) Plans
45
Training
Annual training
As new employees are hired
Erosion and sediment control practices
Spill response
Good housekeeping
The SWPPP
46
Page 27
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Training Subcontractors
Include specific contract language requiring subcontractors to implement appropriate stormwater controls.
47
Concrete Waste Control
Concrete wash water
Grindings
Slurries
48
Page 28
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Dewatering
Only stormwater or groundwater
Cannot discharge sediment
Inspected daily
Includes stream diversions
49
Erosion and Sediment Control Measures
50
Page 29
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Erosion Control (keeping the dirt in place)
1. Minimize disturbed area and protect natural features and soil
2. Phase construction activity
3. Control stormwater flowing onto and through the project
4. Stabilize soils promptly
5. Protect slopes
51
Sediment Controls (the second line of defense)
6. Protect storm drain inlets
7. Establish perimeter controls
8. Retain sediment on-site and control dewatering practices
9. Establish stabilized construction exits
10. Inspect and maintain controls
52
Page 30
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Erosion and Sediment Control MeasuresPerimeter control
Temporary or permanent cover
Required maintenance
Off-site accumulations removed
Withstand a 2yr, 24 hour rain event
TMDL requirements
Appendix 1
53
PerimeterControl
All down slope boundaries
Side slope boundaries
54
Page 31
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Temporary or Permanent Cover
55
Where activities have been completed or temporarily ceased
Include graded slopes, pond embankments, ditches, berms and soil stockpiles
56
Page 32
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Required Maintenance
All control measures must be properly selected, installed, and maintained
Required maintenance must be outlined for each device
Justification required if against guidelines
57
58
Page 33
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Off-site Accumulations
Must be removed
Minimize off-site impacts
Plan must be modified
Have a plan in place for this
59
60
Page 34
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
2 Year, 24 Hour Rain Event
Controls are expected to withstand and function properly
Visible erosion should be minimal
Ranges from about 1.9 inches in the west to 2.3 inches in the east
Rain Gauge
61
62
Page 35
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Must Comply with TMDL Requirements
Patterson Lake
WLA = 0 Tons/year
63
Appendix 1Specific Requirements for ESCMs
64
Page 36
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Permanent Stormwater Management
SWPPP must identify:
− Ponds
− Flow reduction devices
− Infiltration areas
− Energy dissipation at discharge locations
− Erosion protection for outfalls and ditches
65
66
Page 37
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the environmental considerations?
Wetland impacts
Mitigation
404 Permit
Temporary/permanent impacts
Executive Order 11990
67
What are the environmental considerations?
Wildlife
Threatened and Endangered
Fish passage
Spawning seasons
68
Page 38
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the environmental considerations?
Environmental documents
Environmental commitments
69
70
SWPPP must indicate the maintenance intervals for all ESCMs
Page 39
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Inspections
Must provide for site inspections
Including a copy of the inspection report being used
May have to revise SWPPP based upon findings of the inspections
71
Plan Review and Revisions
Signatory Requirements
SWPPP must be made available upon request
72
Page 40
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Plan Review and Revisions
Must amend the SWPPP when there is a change in Design, Construction, Operation, Maintenance, or if found to be ineffective
73
Signatory Requirements
SWPPP must be signed
Signed by a responsible corporate officer, a general partner, or a principal executive officer
Can be someone authorized by the above
Permit contains certification language
74
Page 41
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Local Requirements
Some Cities and Counties have their own requirements
Must comply with the most stringent requirement
75
Final Stabilization
SWPPP must show how the site will be stabilized.
Three methods:
1. 70% Vegetation
2. Farmland
3. Arid exemption (3 year rule)
76
Page 42
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
What are the components of the calculation section in the SWPPP?
Calculations – > data
77
Common SWPPP Mistakes and Violations
Not developing a SWPPP
Missing required sections
Inadequate maps/illustrations
ESCMS not designed to 2 year 24 hour storm
78
Page 43
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Common SWPPP Mistakes and Violations
Weak chain of responsibility section
No signature/certification
No Inspection Report
Cookie cutter SWPPP
79
Art of Writing A SWPPP
Clear and concise
Avoid “as needed” or “when required”
Be specific, but not too specific
80
Page 44
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Timetable of Soil Disturbance
When will soils be disturbed and stabilized?
When will infrastructure be installed?
What ESCMs will be used during a particular phase?
81
Timetable of Soil Disturbance
When will ESCMs be installed or removed?
What phase are you currently in, are ESCMs installed according to the plan?
82
Page 45
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Soils
What types of soils do you have (NRCS)?
How erosive are they to water and wind?
−Do soils have a low, medium or high erosivity to water? Do your ESCMs address this?
− Do soils have a low, medium or high erosivity to wind? What type of ESCMs are you using?
83
Soils
What type of permeability do soils have (low, medium, high)?
− Will water soak in or runoff?
Do soils stick to tires?
− Tracking
84
Page 46
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Chain of Responsibility
Who is responsible for what and when?
If the responsible party is unable to complete their task, who then has authority to make sure that task is completed?
85
Chain of Responsibility
“The owner shall develop a chain of responsibility with all operators on the site to ensure that the SWPPP will be implemented and stay in effect until the construction project is complete, the entire site has undergone final stabilization, and a NOT [notice of termination] has been submitted to the Department.”
86
Page 47
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Trackout
Are you even considering it, because it will happen?
What type of soils do you have?
Will they stick to tires?
87
Trackout
Does your plan call for a trackout pad?
− Is it installed?
− Is it installed in the right spot?
− Have you moved it and did you update your map?
− Are people using it?
88
Page 48
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Trackout
Do you have a plan to clean streets by the end of the day?
89
Dust
Like trackout, are you even considering it, because it will happen
What type of soils do you have?
− Will they blow away?
− Will it effect an individual?
− Will it effect a surface water?
90
Page 49
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Dust
What do you plan on using to control dust?
− Will it be enough?
What other dust control options do you have?
91
Concrete Wash Water
Will trucks be washed on site or back at the plant?
92
Page 50
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Concrete Wash Water
Will there be a wash pit on site?
− Is it shown on the plans?
− Is it in the same location as shown on the plans?
− Will it move around the site?
93
Concrete Wash Water
How will drivers know where it is at?
How was it sized?
How will it being maintained?
94
Page 51
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Erosion and Sediment Control Measures
Do you have an installation guide for selected ESCMs?
How do you know they are installed correctly?
Do you know where you are going to install ESCMs?
95
Erosion and Sediment Control Measures
Is placement/location of ESCMs in accordance with the permit?
Is placement/location of ESCMs in accordance with standard practices?
96
Page 52
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Group Activity
Each group must write a section of the SWPPP
Basic project: 20 mile widening job, last part in town, concrete paving
97
What are the module’s takeaway points?
Design affects SWPPP
SWPPP must convey Design
Two main parts: Illustrative and Narrative
Site Specific
Art of SWPPP Writing
98
Page 53
Module 4: Stormwater Pollution Prevention Plan (SWPPP) –NDDOT Erosion & Sediment Control – Construction Course
Questions?
99
What’s next?
Exam
100
Page 54
