erosion prevention & sediment control training program

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Erosion Prevention & Sediment Control Training Program

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INNOVATION CONFERENCE AGENDA

‐ Introduction and Purpose

‐ Report on Training

‐ Identified Challenges

‐ Developing Solutions

‐ Discussion

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PURPOSE

• To improve environmental stewardship on Highway Division projects through design, selection and implementation of stormwater Best Management Practices.

• Environmental stewardship is the responsibility of all whose actions affect the environment.

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KEY COMPONENTS - WHAT’S NEW

‐ Partnership – MassDOT, DEP, CIM, ACEC

‐ Training team of field experts

‐ Broad audience intended: contractors, MassDOT staff, inspectors, consultants

‐ Transferrable training program

‐ Future certification for MassDOT projects

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Erosion Prevention & Sedimentation Control Training Program

TRAINING PROGRAM OVERVIEW (4 Parts)

Part I: Regulations; Roles; Stormwater Management

Part II: SWPPP (CP/PP), BMPs, Inspections

Part III: Experiences and Lessons Learned

Part IV: Discussion (Pilot Program Feedback)

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TRAINING PROGRAM PART IRegulations, Roles, Stormwater Management

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Erosion vs. Sedimentation

PHOTO SOURCE: https://stormwater.pca.state.mn.us/images/0/02/Subsoil_erosion_at_a_construction_site.PNG

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Types of Erosion

Photo Source: http://agrihelper.blogspot.com/2016/06/types‐of‐erosion‐splashsheetrill‐and.html

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Photo Source: Epsilon

Potential for Erosion is

Accelerated with

Construction

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Primary Factors Influencing Erosion

Photo Sources: Epsilon Associates, MACC and USDA NRCS.See MassDOT ESC Field Guide Page 3

Soils

Topography

Vegetative Cover

Weather

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The SWPPP• MA Wetlands Protection Act

regulations requires a plan to control construction related impacts (erosion prevention, sediment controls and other pollutants) ;

• Clean Water Act regulates construction stormwater management.

The Stormwater Pollution Prevention Plan:EPA and MA Wetlands Protection Act

https://www3.epa.gov/npdes/pubs/sw_swppp_guide.pdf

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Soil Properties• Limit exposure amount

of erodible soils• Timing and length

of exposure

What can you control?

Surface Cover• Vegetation

─ Keep Existing─ Establish new

vegetation early• Impervious Cover

─ Length of slopes─ Steepness─ Concentrating flows

• Remove only when necessary through phasing.

Yes Maybe

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Primary– Erosion Prevention• Preventing soil

detachment

Secondary– Sediment Controls

• Capture transported sediment

Photo Source: MACC

Erosion Prevention and Sediment Control Measures

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TRAINING PROGRAM PART IISWPPP (CP/PP), Inspections

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Stormwater Management:

Storm Water Pollution Prevention Plan (SWPPP) or (Construction Period Pollution Prevention Plan (CPPP)

Objectives Per EPA Construction General Permit (CGP)• Minimize extent and duration of exposed soils (phasing);• Install perimeter controls;• Apply erosion control practices;• Reduce runoff velocities;• Stabilize disturbed areas as soon as possible; and• Regular and proactive maintenance of site and BMPs.

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Responsible Parties for Certifying SWPPP


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Roles & Responsibilities• Regulatory Agencies – Local, State, Federal depending on

scope of project• MassDOT Construction Division• MassDOT Highway Division

– Landscape Design– Environmental

• MassDOT District Office• Resident Engineer• Site Contractor • Environmental Monitor• Wetlands Specialist• SWPPP Inspector

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Erosion & Sedimentation Control Training Program

I. Contact Information/Responsible Parties

II. Site Evaluation/AssessmentIII. Compliance with Other

Federal RequirementsIV. Erosion & Sediment

Controls

• Training• Certification• Appendices

– Plans– Permits– Inspection Form– Training Log


Typical SWPPP Outline and Contents

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Approaches to BMP Selection and Management

Five topic areas:• Minimize Disturbance (primary measure)

• Runoff Control (minimize erosion potential)

• Erosion Prevention (soil stabilization)• Sediment Control (keep sediment on‐site)

• Good Housekeeping Practices (pollution prevention standards)

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See MassDOT ESC Field Guide Page 1

Erosion Prevention &

Sediment Control

Selection Matrix

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Minimizing Disturbance:

Preserving Vegetation

• Erosion Prevention BMP’s are the first lineof defense!

• Sediment Control BMPs are the last line of defense!

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Minimizing Disturbance:

Preserving VegetationMinimizing Disturbances wherever practicable.

"Once erosion occurs, unless you have some great practices, particulate removal efficiencies are typically less than 50% for most BMPs.“

Erosion Control Magazine, June ’02

Retaining and establishing even small areas of vegetative cover is a valuable tool for preventing and minimizing erosion.

See MassDOT ESC Field Guide Page 7 Photo Source: AECOM

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Runoff Control BMPs:

Swales or Temporary Diversions

See MassDOT ESC Field Guide Page 15 ‐ 16Photo Source: BSC Group

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Check Dams

• Reduce velocity;• Collect sediment;• Must be maintained;• Designed to be overtopped; and

• Installation must not allow for structures to be bypassed.

See MassDOT ESC Field Guide Page 11Photo Source: BSC Group

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Riprap / Stone

See MassDOT ESC Field Guide Page 49 Photo Source: BSC Group

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Outlet Velocity Protection

Photo Source: BSC Group

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Erosion Prevention BMPs:

Surface Roughening

See MassDOT ESC Field Guide Page 22‐23Photo Source: BSC Group

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Mulches and Tackifiers

Source: BSC GroupPhoto Source: Epsilon

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Seeding

See MassDOT ESC Field Guide Page 30Photo Source: BSC Group

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Blankets

See MassDOT ESC Field Guide Page 27‐29Photo Source: BSC Group

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Sediment Control BMPs:

Sediment Control Barriers

See MassDOT ESC Field Guide Page 37

Photo Source: MACC

Silt fence, straw wattles, compost filter tubes, straw bales, etc.

Photo Source: MassDOT

Photo Source: Northpoint Engineering & MACC

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Inlet Protection

See MassDOT ESC Field Guide Page 46‐47 Photo Source: Epsilon and BSC Group

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Wet Ponds

Erosion & Sedimentation Control Training Program

See MassDOT ESC Field Guide Page 42 Photo Source: MassDOT and BSC Group

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Temporary Sediment Basins/Traps

See MassDOT ESC Field Guide Page 42 Photo Sources: MACC & BSC Group

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Photo Source: Epsilon and Northpoint Engineering



Stockpile Management and Construction Entrances

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Sediment Control BMPs:Dewatering Practices / Groundwater Management

See MassDOT ESC Field Guide Page 61 Photo Source: Epsilon and MACC

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• Concrete washdown Containment

• Dust control• Street sweeping• Trash containment• Fuel storage• Emergency stockpiles

Photo Source: AECOM

Good Housekeeping Practices:


https://www.des.nh.gov/organization/commissioner/pip/factsheets/dwgb/documents/dw

gb‐22‐6.pdf


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Inspections

• Inspector qualifications• Responsibilities• Procedures• Frequency


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TRAINING PROGRAM PART IIILessons Learned

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Inspection Exercise

Photo Source: MACC

Potential issues?


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What is a corrective action vs maintenance?


Photo Source: Northpoint Engineering

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TRAINING PROGRAM PART IVProgram Evaluation & Discussion

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TRAINING PROGRAM

Innovation Conference Report Back

Specific Challenges & Evolving Solutions

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Challenges for Highway Construction

Erosion Prevention

– Erosion Prevention BMPs are first line of defense!

– Sediment Control BMPS are the last line of defense!

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SWPPP - CGP Timelines for Site Stabilization

• Sites that disturb 5 acres or less must complete stabilization within a 14‐day timeframe in areas where construction has permanently ceased or is inactive for 14 or more days.

• For sites that disturb >5 acres, operators may choose between completing stabilization within a 14‐day timeframe if they limit (i.e., phase) disturbances to 5 acres or less at any one time; or

• Within a 7‐day timeframe if they do not limit (i.e., phase) disturbances to 5 acres or less at any one time.

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1. Insufficient erosion prevention. 2. Not using phased grading or providing temporary or

permanent cover (i.e., soil stabilization).3. No sediment control for temporary stockpiles.4. No inlet protection.5. No BMPs to minimize vehicle tracking on roads.6. Dewatering or other pollutant discharges at construction site.7. Poorly managed concrete washout areas.8. Inadequate BMP maintenance.9. Reporting, documenting, and response.


Compliance Issues

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• “Box‐out” (phase) temporarily and permanently altered portions of the site to leave undisturbed vegetated zones rather than opening large contiguous areas at once;

• Divide the Project into phases and minimize new disturbance;• Complete each phase and install erosion controls/stabilize as soon as possible.


SWPPP - Construction Sequencing

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Contract Items and Quantities for Regulatory Compliance

Source: BSC Group

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Photo Source: AECOM

“Remember that post-construction period BMPs are almost never used to control sedimentation during construction. That means that post-construction period BMPsinstalled during the construction period must be protected during construction and

inspected before the project is deemed complete.” MassDEP Stormwater Guidance for Selecting BMPs (Ch.7).


Post Construction BMP’s and Sediment Control

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Design phase

‐ Site analysis to anticipate stormwater issues in construction

‐ Contract plans and specifications to anticipate regulatory expectations

Erosion Prevention and Sedimentation Control

Evolving Solutions

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• Drainage patterns by sub‐watersheds;

• Inventory and label resources

• Proper runoff coefficients;

• Runoff volumes and discharge rates;

• Erodibility;• Sediment yield; and• BMP‐specific details. Photo Source: AECOM

Evolving Solutions for Highway Construction

Design Phase Site Analysis

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• Identify phasing site construction and include:– Commencement/duration of construction activities;

– Temporary or permanent cessation of construction activities;

– Temporary or final stabilization of areas of exposed soil; and

– Cessation of pollutant‐generating activities. Scheduling,

both short- and long-range, is

key to success!


Design Phase SWPPP Development

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• Identify necessary erosion prevention and sedimentation control items and quantities

• Provide direction on plans for parametric decision making • Integrate with project‐specific permits for applicable

requirements• SWPPP Item ‐ Develop schematic plan and schedule for

construction sequencing and phasing.• Checklist of submittals:

– Construction stormwater management shop drawing plan– Stockpile management shop drawings– Dewatering locations and methods– Entrance management shop drawings


Contract Development

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Coordinate Plans to Prevent Discrepancies

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• Bonded fiber matrix

• Temporary seeding for interim stabilization


Evolving Solutions for Highway ConstructionNew/Revised Contract Toolbox for Erosion Prevention


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• New Sediment Barrier Specs/Details– Flexible and adaptable– In‐spec guidance on application– Biddable – various BMP’s

Evolving Solutions for Highway ConstructionRevised/Expanded Contract Items for Sediment Control

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Scaling Appropriate Solutions at the Design StageProject thresholds – design checklist

– Project types, e.g. variance projects

– Project area/watershed area

– Resource areas and related permits

– Duration of project

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Good communication

is the most important and least expensive

BMP!

Evolving Solutions for Highway ConstructionInteragency Communication andPartnering

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Thank for listening. It’s your turn now.

PANEL TIME !


erosion prevention & sediment control training program

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