THE EROSION CONTROL BMP MANUAL What are the Major Changes?
A GUIDANCE DOCUMENT It was published in the PA Bulletin October 17, 2009 There was a 60 day comment period
OVERALL LAYOUT Current Draft Introduction 17 Chapters 12 Appendices List of References 555 + pages (excluding cover & indices) YOI!
INTRODUCTION Why is erosion & sediment pollution important?
CHAPTER 1: REQUIRED PLAN CONTENT Descriptions of the 15 Items listed in Chapter 102 expanded 1. Topographic Features 2. Soil Use Limitations 3. Proposed Alteration 4. Runoff 5. Receiving Surface Waters 6. Perimeter BMPs 7. Sequence (BMP installation & removal) on the plan drawings (not in narrative)
CHAPTER 1: REQUIRED PLAN CONTENT Descriptions of the 15 Items listed in Chapter 102 expanded 8. Supporting Calcs 9. Plan Drawings 10. Maintenance Program 11. Recycling & Disposal of Materials 12.Geologic or Soil Conditions that could cause pollution 13.Thermal impacts (in accordance with PCSM plan)
CHAPTER 1: REQUIRED PLAN CONTENT Descriptions of the 15 Items listed in Chapter 102 expanded 14. Consistency with PCSM plan 15. Riparian Forest Buffers identified
CHAPTER 2: BMP SEQUENCING Expanded to provide better guidance 3 Standard Notes recommended for detail sheets Suggested Outline Provided
Exploration & Surveying BMPs should be provided for disturbed areas as well as surface water crossings (streams, wetlands, etc.) May use the BMPs from Chapter 3 Others may be approved on case-by-case basis if found to be equal to or better than those in Chapter 3
BMP Ratings for use in Special Protection Watershed BMPs with low sediment removal efficiencies are not ABACTS BMPs with moderate sediment removal efficiencies are ABACTS for HQ watersheds, but not EV watersheds BMPs with high sediment removal efficiencies are ABACTS for HQ & EV watersheds
CHAPTER 3: SITE ACCESS Rock Construction Entrance New detail
Rock Construction Entrance With Wash Rack ABACT for HQ & EV watersheds
Temporary & Permanent Access Roads Addressed for the 1 st time
Temporary & Permanent Crowned Roadways Access Roads
Insloping Temporary & Permanent Access Roads
Waterbar Brought out of the Pipeline text
Waterbar The detail has been enlarged & clarified
Broad-based Dips 2 details Broad-based Dip
Broad-based Dip Spacing Table provided Road Grade (Percent) Spacing Between Dips, Culverts, or Deflectors (feet) <2 300 3 235 4 200 5 180 6 165 7 155 8 150 9 145 10 140
OPEN-TOP CULVERTS Brought into the manual from the Timber Harvesting packet
WATER DEFLECTORS May be used in lieu of open-top culverts
ROADSIDE DITCH Brought into the manual from the Timber Harvesting packet Need for lined Protective liners is addressed
DITCH RELIEF CULVERT Brought back to the manual
Road Grade (%) DITCH RELIEF CULVERT Table 3.3 Spacing of Temporary Culverts Culvert Spacing* (ft) Length of Upslope Drainage (ft) < 300 300 400 400 500 500 600 Minimum Culvert Size (in) >600 2 300 12 15 15 15 18 3 235 12 15 15 15 18 4 200 12 15 15 15 18 5 180 12 12 15 15 15 6 165 12 12 12 15 15 7 155 12 12 12 12 15 8 150 12 12 12 12 15 9 145 12 12 12 12 15 10 140 12 12 12 12 15 12 135 12 12 12 12 15 *Culvert spacing may be adjusted slightly to take advantage of natural drainageways.
Road Grade Percent DITCH RELIEF CULVERT Table 3.4 Spacing of Permanent Culverts Gravels, Sandy Gravels, Aggregate Surfacing Silty Gravels, Clayey Gravels Soil Type in Ditch Plastic and Non-plastic Inorganic Clays Feet Inorganic Silts, Silty or Clayey Sands Sands, Silty Sands, and Gravelly Sands 2 390 315 245 170 95 4 335 275 210 145 85 6 285 230 180 125 75 8 240 195 150 105 65 10 200 160 125 90 55 12 160 130 105 75 45 14 135 110 85 60 35
TURNOUTS
COMPOST SOCK SEDIMENT TRAP Addressed in this chapter to emphasize their usefulness in controlling runoff from access roads At entrances or where surface waters are in relatively close proximity to the access road An ABACT for HQ & EV watersheds
TEMPORARY STREAM CROSSINGS Should be avoided wherever possible Must be provided wherever construction equipment (including clearing and grubbing) must cross an existing stream channel Appropriate Chapter 105 permits must be obtained from DEP Designs must adhere to the conditions of those permits
TEMPORARY STREAM CROSSINGS Ford type crossings may not be used by construction equipment
TEMPORARY STREAM CROSSINGS Temporary bridges are the preferred method of crossing
TEMPORARY STREAM Culvert Pipes CROSSINGS
TEMPORARY WETLAND CROSSINGS Should be avoided wherever possible Must be minimized
TEMPORARY WETLAND Figure 3.5 Typical Tire Mat Crossing Figure 3.6 Typical Expanded Metal Grating Crossing Figure 3.7 Typical Wood Mat Crossing CROSSINGS
EARTHWORK WITHIN STREAM CHANNELS Excavations done from the top of banks Where it is not possible Temporary crossing Causeway
EARTHWORK WITHIN STREAM CHANNELS Figure 3.9 Temporary bypass channel same as old Figure 33 A geotextile protective lining should be provided Channel designed to pass normal base flows if the crossing will be completed in one to three days Otherwise, channel must be designed for bank-full flow
EARTHWORK WITHIN STREAM CHANNELS Figure 3.10 Temporary bypass pipe same as old Figure 34 Pipe sized so that the normal flow depth (d) is < ½ the diameter of the pipe (D)
EARTHWORK WITHIN STREAM CHANNELS Figure 3.11 Pumped water bypass system revised to show filter bag for work area Also has following note: Pump intake shall be maintained a sufficient distance from bottom to prevent sediment from entering the system
CHAPTER 3: SITE ACCESS Earthwork within stream channels Earthwork within lakes or ponds Turbidity barriers
CHAPTER 3: SITE ACCESS Earthwork within stream channels Earthwork within lakes or ponds Dewatering work areas New detail for pumped water filter bags
CHAPTER 3: SITE ACCESS Earthwork within stream channels Earthwork within lakes or ponds Dewatering work areas New detail for pumped water filter bags Detail provided for sump pits
CHAPTER 3: SITE ACCESS Site Housekeeping & Materials Management Waste Management Concrete Washouts
CHAPTER 4: SEDIMENT BARRIERS Brought back the alignment figure
CHAPTER 4: SEDIMENT Compost Sock ABACT for HQ & EV watersheds Can be used in some locations where silt fence cannot 8 & 9 socks for single lots only BARRIERS
CHAPTER 4: SEDIMENT BARRIERS Max Slope Length Nomograph
CHAPTER 4: SEDIMENT Compost Filter Berm ABACT for HQ but not EV BARRIERS Compost Berm
CHAPTER 4: SEDIMENT Weighted Sediment Filter Tubes ABACT for HQ but not EV BARRIERS
Silt Fence CHAPTER 4: SEDIMENT Not an ABACT for HQ or EV Tolerance for support stakes 8 Setback BARRIERS
CHAPTER 4: SEDIMENT BARRIERS Max Slope Length Nomograph for Silt Fence
CHAPTER 4: SEDIMENT BARRIERS Minimum Silt Fence Fabric Properties are provided
CHAPTER 4: SEDIMENT Super Silt Fence BARRIERS Not an ABACT for HQ or EV Posts must be installed with a post-hole drill
CHAPTER 4: SEDIMENT Fiber Logs (wattles) Not an ABACT 12 Logs may use Standard Silt Fence slope lengths 18 Logs may use Reinforced Silt Fence slope lengths BARRIERS
Wood Chip Berms CHAPTER 4: SEDIMENT ABACT for HQ, but not EV BARRIERS
CHAPTER 4: SEDIMENT Straw Bale Barriers Not an ABACT BARRIERS Disallowed for projects lasting more than 3 months
CHAPTER 4: SEDIMENT BARRIERS Vegetative Filter Strips ABACT for HQ (when used in conjunction with another BMP) but not EV Minimum width table provided
CHAPTER 4: INLET PROTECTION Inlet filter bags ABACT for HQ, not EV
CHAPTER 4: INLET PROTECTION Stone Inlet Protection Not an ABACT unless compost layer provided (HQ, not EV)
CHAPTER 4: INLET PROTECTION Alternate details for stone & mesh at grade
CHAPTER 4: INLET PROTECTION Alternate details for stone & mesh not at grade
CHAPTER 5: RUNOFF CALCS Designers referred to NOAA s website for up-to-date rainfall data Runoff coefficient table expanded to give more options New equations for calculating intensity
CHAPTER 5: RUNOFF CALCS Penn DOT s updated tables, charts, & maps provided as an alternative method
New standard detail provided for vegetated channels CHANNELS
CHANNELS Equation provided to calculate Manning s n for vegetated channels (Retardance C) (n = 0.047-0.4 )
CHANNELS Tables provided for trapezoidal vegetated channel n values (Retardance C)
CHANNELS Standard detail provided for sodded channels
CHANNELS New standard detail provided for riprap channels
CHANNELS Guidance provided for design of riprap channels using shear stress
Nomograph for permissible flow depth of riprap channels (acceptable alternative to shear stress analysis) CHANNELS
CHANNELS Table for reno mattress & gabions revised
TOP-OF-SLOPE BERMS New standard detail provided for Top-ofslope Berms
TOP-OF-SLOPE BERMS Figure provided for maintaining Top-ofslope Berms as fills are built upward
CHAPTER 7: SEDIMENT BASINS Additional Design Criteria (Now 26) Forebays and/or turbidity barriers may be substituted for 2:1 flow length:width ratio Routing of peak flow from 25 yr/24 hr storm may be substituted for 2 cfs discharge capacity Principal spillway must have capacity for 10 yr/24 hr storm Some outlet barrels to be set in concrete cradle PVC outlet barrels disallowed
CHAPTER 7: SEDIMENT BASINS Additional Design Criteria Guidance provided for discharge analyses Limitations put on soils acceptable for use as embankment material (GC, GM, SC, SM, CL or ML )
CHAPTER 7: SEDIMENT BASINS New skimmer detail provided
CHAPTER 7: SEDIMENT BASINS Detail for skimmer attached to permanent riser provided
CHAPTER 7: SEDIMENT BASINS Detail for stone landing for a skimmer provided
CHAPTER 7: SEDIMENT BASINS Design chart for skimmer orifice revised
CHAPTER 7: SEDIMENT BASINS Tables provided for outlet barrel capacity
CHAPTER 7: SEDIMENT BASINS Standard cross-section has been revised
CHAPTER 7: SEDIMENT BASINS Table provided for sizing concrete bases of risers
CHAPTER 7: SEDIMENT BASINS Tables provided for sizing emergency spillway
CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate forebay
CHAPTER 7: SEDIMENT BASINS Confusing chart for sizing anti-seep collars replaced with step-by-step guidance for calculating size & spacing of collars Typical details provided
CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate filter diaphragm
CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate concrete cradle
CHAPTER 8: SEDIMENT TRAPS Additional Design Criteria (Now 14) Minimum surface area to be provided Permanent facilities to meet standards of Stormwater BMP Manual 4:1 Flow length:width ratio for traps in special protection watersheds Discharge requirements added
CHAPTER 8: SEDIMENT TRAPS Embankment Spillway Detail revised
CHAPTER 8: SEDIMENT TRAPS Table provided for sizing barrel/riser spillways
CHAPTER 8: SEDIMENT TRAPS Type M Inlet Trap Detail revised
CHAPTER 8: SEDIMENT TRAPS Detail provided for permanent riser with temporary holes
STEEP GRADIENT PIPES Slopes > 0.05 ft/ft Manning s equation must be used For pipe with high anticipated velocities (>17.0 FPS), drop structures or other energy reducing structures to reduce velocity prior to discharge
MANNING S EQUATION V 1.486 n D 4 2 3 S where: V = Velocity in fps D = Pipe diameter in feet S = Pipe slope in ft/ft
MAX & MIN TAILWATER Disallowed for box culverts
GROUTING Grouting of riprap is not recommended for most installations Where riprap is grouted, the following applies: 1. Precautions must be taken to prevent uncured concrete from coming into contact with any surface waters 2. Grout must be placed in a layer with thickness equivalent to the d50 stone size over the entire extent of the apron prior to rock placement 3. After stone placement, void spaces shall be filled with grout
CHAPTER 9: OUTLET Detail provided for outfall without wingwalls PROTECTION
CHAPTER 9: OUTLET Detail provided for discharge to existing channel PROTECTION
CHAPTER 9: OUTLET PROTECTION Detail provided for transition flow mat
CHAPTER 9: OUTLET PROTECTION Figure provided to illustrate drop inlet structure
CHAPTER 10: ON-LOT 3 Standard Details provided CONTROLS
CHAPTER 11: STABILIZATION Surface roughening techniques should be applied to slopes 3:1 and greater unless it can be shown that no potential for sediment pollution to surface waters Slopes within 50 feet of surface water should be blanketed if seeding is proposed as the means to achieving permanent stabilization Spray-on type blankets should be applied to roughened surfaces
CHAPTER 11: STABILIZATION Table provided for various depths of topsoil application
CHAPTER 11: STABILIZATION Table provided for application rates of soil amendments
CHAPTER 11: STABILIZATION Guidance provided for Bonded Fiber Matrices and Flexible Growth Media Guidance provided for use of PAMs Guidance provided for sodding
CHAPTER 11: STABILIZATION Guidance provided cellular confinement systems
CHAPTER 12: NEW PRODUCTS & PROCEDURES One requirement added: Applicants should submit their request for approval (along with all pertinent drawings, details, supporting calculations, manufacturer s recommendations, etc.) to the local Conservation District, the appropriate Regional DEP Office (Watershed Management), AND the Area Engineer responsible for the part of the state in which the project is located
ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair
ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites
ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds
ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds Slope Failures
ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds Slope Failures Geothermal Wells
APPENDICES A Checklists Complete Plan Checklist Revised Technical Review Checklist Expanded Technical Review Checklist
APPENDICES A Checklists B Standard Worksheets
APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes Standard Notes placed on Plan Drawings Optional Notes placed on drawings where appropriate
APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings
APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings E Soil Use Limitations If an X appears, go to the NRCS website for more info
APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings E Soil Use Limitations F Energy Dissipaters
APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings E Soil Use Limitations F Energy Dissipaters G- Structural Level Spreaders
H Dust Control APPENDICES
APPENDICES H Dust Control I Guide to Preserving Trees
APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting
APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting K Water Well Drilling Fact Sheet
APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting K Water Well Drilling Fact Sheet L Glossary References
QUESTIONS?