THE EROSION CONTROL BMP MANUAL. What are the Major Changes?
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1 THE EROSION CONTROL BMP MANUAL What are the Major Changes?
2 A GUIDANCE DOCUMENT It was published in the PA Bulletin October 17, 2009 There was a 60 day comment period
3 OVERALL LAYOUT Current Draft Introduction 17 Chapters 12 Appendices List of References pages (excluding cover & indices) YOI!
4 INTRODUCTION Why is erosion & sediment pollution important?
5 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)
6 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)
7 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
8 CHAPTER 2: BMP SEQUENCING Expanded to provide better guidance 3 Standard Notes recommended for detail sheets Suggested Outline Provided
9 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
10 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
11 CHAPTER 3: SITE ACCESS Rock Construction Entrance New detail
12 Rock Construction Entrance With Wash Rack ABACT for HQ & EV watersheds
13 Temporary & Permanent Access Roads Addressed for the 1 st time
14 Temporary & Permanent Crowned Roadways Access Roads
15 Insloping Temporary & Permanent Access Roads
16 Waterbar Brought out of the Pipeline text
17 Waterbar The detail has been enlarged & clarified
18 Broad-based Dips 2 details Broad-based Dip
19 Broad-based Dip Spacing Table provided Road Grade (Percent) Spacing Between Dips, Culverts, or Deflectors (feet) <
20 OPEN-TOP CULVERTS Brought into the manual from the Timber Harvesting packet
21 WATER DEFLECTORS May be used in lieu of open-top culverts
22 ROADSIDE DITCH Brought into the manual from the Timber Harvesting packet Need for lined Protective liners is addressed
23 DITCH RELIEF CULVERT Brought back to the manual
24 Road Grade (%) DITCH RELIEF CULVERT Table 3.3 Spacing of Temporary Culverts Culvert Spacing* (ft) Length of Upslope Drainage (ft) < Minimum Culvert Size (in) > *Culvert spacing may be adjusted slightly to take advantage of natural drainageways.
25 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
26 TURNOUTS
27 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
28 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
29 TEMPORARY STREAM CROSSINGS Ford type crossings may not be used by construction equipment
30 TEMPORARY STREAM CROSSINGS Temporary bridges are the preferred method of crossing
31 TEMPORARY STREAM Culvert Pipes CROSSINGS
32 TEMPORARY WETLAND CROSSINGS Should be avoided wherever possible Must be minimized
33 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
34 EARTHWORK WITHIN STREAM CHANNELS Excavations done from the top of banks Where it is not possible Temporary crossing Causeway
35 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
36 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)
37 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
38 CHAPTER 3: SITE ACCESS Earthwork within stream channels Earthwork within lakes or ponds Turbidity barriers
39 CHAPTER 3: SITE ACCESS Earthwork within stream channels Earthwork within lakes or ponds Dewatering work areas New detail for pumped water filter bags
40 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
41 CHAPTER 3: SITE ACCESS Site Housekeeping & Materials Management Waste Management Concrete Washouts
42 CHAPTER 4: SEDIMENT BARRIERS Brought back the alignment figure
43 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
44 CHAPTER 4: SEDIMENT BARRIERS Max Slope Length Nomograph
45 CHAPTER 4: SEDIMENT Compost Filter Berm ABACT for HQ but not EV BARRIERS Compost Berm
46 CHAPTER 4: SEDIMENT Weighted Sediment Filter Tubes ABACT for HQ but not EV BARRIERS
47 Silt Fence CHAPTER 4: SEDIMENT Not an ABACT for HQ or EV Tolerance for support stakes 8 Setback BARRIERS
48 CHAPTER 4: SEDIMENT BARRIERS Max Slope Length Nomograph for Silt Fence
49 CHAPTER 4: SEDIMENT BARRIERS Minimum Silt Fence Fabric Properties are provided
50 CHAPTER 4: SEDIMENT Super Silt Fence BARRIERS Not an ABACT for HQ or EV Posts must be installed with a post-hole drill
51 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
52 Wood Chip Berms CHAPTER 4: SEDIMENT ABACT for HQ, but not EV BARRIERS
53 CHAPTER 4: SEDIMENT Straw Bale Barriers Not an ABACT BARRIERS Disallowed for projects lasting more than 3 months
54 CHAPTER 4: SEDIMENT BARRIERS Vegetative Filter Strips ABACT for HQ (when used in conjunction with another BMP) but not EV Minimum width table provided
55 CHAPTER 4: INLET PROTECTION Inlet filter bags ABACT for HQ, not EV
56 CHAPTER 4: INLET PROTECTION Stone Inlet Protection Not an ABACT unless compost layer provided (HQ, not EV)
57 CHAPTER 4: INLET PROTECTION Alternate details for stone & mesh at grade
58 CHAPTER 4: INLET PROTECTION Alternate details for stone & mesh not at grade
59 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
60 CHAPTER 5: RUNOFF CALCS Penn DOT s updated tables, charts, & maps provided as an alternative method
61 New standard detail provided for vegetated channels CHANNELS
62 CHANNELS Equation provided to calculate Manning s n for vegetated channels (Retardance C) (n = )
63 CHANNELS Tables provided for trapezoidal vegetated channel n values (Retardance C)
64 CHANNELS Standard detail provided for sodded channels
65 CHANNELS New standard detail provided for riprap channels
66 CHANNELS Guidance provided for design of riprap channels using shear stress
67 Nomograph for permissible flow depth of riprap channels (acceptable alternative to shear stress analysis) CHANNELS
68 CHANNELS Table for reno mattress & gabions revised
69 TOP-OF-SLOPE BERMS New standard detail provided for Top-ofslope Berms
70 TOP-OF-SLOPE BERMS Figure provided for maintaining Top-ofslope Berms as fills are built upward
71 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
72 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 )
73 CHAPTER 7: SEDIMENT BASINS New skimmer detail provided
74 CHAPTER 7: SEDIMENT BASINS Detail for skimmer attached to permanent riser provided
75 CHAPTER 7: SEDIMENT BASINS Detail for stone landing for a skimmer provided
76 CHAPTER 7: SEDIMENT BASINS Design chart for skimmer orifice revised
77 CHAPTER 7: SEDIMENT BASINS Tables provided for outlet barrel capacity
78 CHAPTER 7: SEDIMENT BASINS Standard cross-section has been revised
79 CHAPTER 7: SEDIMENT BASINS Table provided for sizing concrete bases of risers
80 CHAPTER 7: SEDIMENT BASINS Tables provided for sizing emergency spillway
81 CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate forebay
82 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
83 CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate filter diaphragm
84 CHAPTER 7: SEDIMENT BASINS Figure provided to illustrate concrete cradle
85 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
86 CHAPTER 8: SEDIMENT TRAPS Embankment Spillway Detail revised
87 CHAPTER 8: SEDIMENT TRAPS Table provided for sizing barrel/riser spillways
88 CHAPTER 8: SEDIMENT TRAPS Type M Inlet Trap Detail revised
89 CHAPTER 8: SEDIMENT TRAPS Detail provided for permanent riser with temporary holes
90 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
91 MANNING S EQUATION V n D S where: V = Velocity in fps D = Pipe diameter in feet S = Pipe slope in ft/ft
92 MAX & MIN TAILWATER Disallowed for box culverts
93 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
94 CHAPTER 9: OUTLET Detail provided for outfall without wingwalls PROTECTION
95 CHAPTER 9: OUTLET Detail provided for discharge to existing channel PROTECTION
96 CHAPTER 9: OUTLET PROTECTION Detail provided for transition flow mat
97 CHAPTER 9: OUTLET PROTECTION Figure provided to illustrate drop inlet structure
98 CHAPTER 10: ON-LOT 3 Standard Details provided CONTROLS
99 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
100 CHAPTER 11: STABILIZATION Table provided for various depths of topsoil application
101 CHAPTER 11: STABILIZATION Table provided for application rates of soil amendments
102 CHAPTER 11: STABILIZATION Guidance provided for Bonded Fiber Matrices and Flexible Growth Media Guidance provided for use of PAMs Guidance provided for sodding
103 CHAPTER 11: STABILIZATION Guidance provided cellular confinement systems
104 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
105 ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair
106 ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites
107 ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds
108 ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds Slope Failures
109 ADDITIONAL CHAPTERS 17 Areas of Special Concern Sinkhole Repair Contaminated Sites Special Protection Watersheds Slope Failures Geothermal Wells
110 APPENDICES A Checklists Complete Plan Checklist Revised Technical Review Checklist Expanded Technical Review Checklist
111 APPENDICES A Checklists B Standard Worksheets
112 APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes Standard Notes placed on Plan Drawings Optional Notes placed on drawings where appropriate
113 APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings
114 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
115 APPENDICES A Checklists B Standard Worksheets C - Standard Plan Notes D Standards for Maps & Drawings E Soil Use Limitations F Energy Dissipaters
116 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
117 H Dust Control APPENDICES
118 APPENDICES H Dust Control I Guide to Preserving Trees
119 APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting
120 APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting K Water Well Drilling Fact Sheet
121 APPENDICES H Dust Control I Guide to Preserving Trees J Tree Planting K Water Well Drilling Fact Sheet L Glossary References
122 QUESTIONS?
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