EROSION & SEDIMENT CONTROL
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1 EROSION & SEDIMENT CONTROL Surface Water Protection During Well Site Construction Kelly Kees, PE WVDEP, Office of Oil and Gas
2 SEDIMENT & EROSION CONTROL PLANS Per West Virginia State Code (d) 22-6A-7(c), an erosion and sediment control plan shall accompany each application for a well work permit
3 SEDIMENT & EROSION CONTROL PLANS Erosion and Sediment Control Plan: Over 3 acres disturbed, excluding pipelines and roads, plans must be certified by registered engineer. Contains a narrative of events and plan view drawings. The narrative must describe a general sequence of events, how and when each construction phase will occur, a description of stabilization methods to be used along with timeframes of usage.
4 SEDIMENT & EROSION CONTROL PLANS
5 CLEARING AND GRUBBING Clearing of vegetation should be kept to the minimum necessary for construction plus the installation of sediment controls.
6 ACCESS ROAD CONSTRUCTION Well access roads that intersect public roads must have installed gravel or other aggregates placed to keep mud off the highway All vehicles entering and exiting the site shall do so via the construction entrance.
7 ACCESS ROAD CONSTRUCTION
8 ROCK DITCH CHECK DAMS Small temporary stone dams constructed across a ditch used to reduce the velocity of storm water flows, thereby reducing erosion of the channel and trapping sediment This practice is the replacement for the traditionally misused hay/straw bales and silt fence ditch checks.
9 ROCK DITCH CHECK DAMS
10 OUTLET PROTECTION All culvert outlets shall have some type of energy dissipating structure for erosion protection Stone must be hard, angular and of a quality resistant to weathering and disintegration
11 OUTLET PROTECTION
12 DIVERSION DITCHES A channel or ridge constructed across a slope for diverting surface runoff. This ditch intercepts surface water before it enters an erodible area and conveys the runoff to a safe outlet. All ditches should have erosion protection and/or stabilizing measures as well as outlet protection
13 BRUSH BARRIERS Brush barriers are perimeter sediment control structures constructed of small tree branches, root mats, stone, or other debris left over from site clearing. The brush barrier can be very effective at stopping large debris, rocks, stumps, but may need backed up with a silt fence to trap sediment
14 COMPOST FILTER SOCK A compost filter sock is a mesh tube filled with composted material that is placed perpendicular to sheet-flow runoff to control erosion and retain sediment from disturbed areas. A filter sock can be used as a perimeter control in the place of the traditional silt fence or straw bales. The smaller diameter filter socks can be used to slow ditch water drainage and for inlet protection
15 COMPOST FILTER SOCK
16 COMPOST FILTER SOCK Pyramid Compost Filter Sock
17 STRAW WATTLES Wattles are able to effectively filter out sediment while still allowing water to flow into a storm drain. Typical construction of the wattle includes an exterior jute netting and an interior made from wheat straw
18 SILT FENCES A typical fence consists of a piece of synthetic filter fabric stretched between a series of wooden or metal fence stakes along a horizontal contour level. The design/placement of the silt fence should create a pooling of runoff, which then allows sedimentation to occur. Water can then seep through the silt fence fabric In areas where concentrated flows can be expected, use armored diversions and sediment traps. In ditches or swales rock check dams should be used.
19 SILT FENCES
20 SUPER SILT FENCE A super silt fence is a temporary barrier of geotextile fabric over chain link fence. It is used to intercept sediment-laden runoff from areas that are too large for regular silt fence. Super silt fence can be used where the installation of a diversion and/or sediment trap would destroy sensitive areas, woods, wetlands, riparian zones, etc
21 SUPER SILT FENCE
22 SEDIMENT TRAPS A trap constructed to collect water runoff, with adequate retention time to allow sediment to settle Sediment traps should be used for drainage areas of no more than 5 acres
23 ROLLED EROSION CONTROL PRODUCT Rolled Erosion Control Products (RECPs) include a variety of temporary or permanently installed manufactured products designed to control erosion and enhance vegetation establishment and survivability, particularly on slopes and in channels Examples: Netting Open weave textiles A variety of erosion control blankets (ECBs) made of biodegradable natural materials (e.g., straw, coconut fiber) can be used
24 WELL PAD BERMS Well sites need water runoff and spill protection. Measures such as berms with closable pipe slope drains directed to stabilized ditches must be used. A mountable berm area is used to enter the pad from the access road.
25 2 KEY THINGS FOR ALL S&E CONTROLS Installation Maintenance
26 INSTALLATION OF E&S CONTROL DEVICES The proper installation of these devices is key to them working correctly. All manufacturers directions should be followed during installation.
27 MAINTENANCE All E&S controls should be checked every 2 weeks or bi-monthly. Also checked within 24 hours of any significant rain event, which is typically defined as rainfall of 2 inches or more in a 6 hour period Any damaged structures should be replaced as soon as possible
28 TEMPORARY SEEDING Temporary seed where exposed soil is not to be worked for periods longer than 21 days or as soon as any finish dirt work is completed. Soil preparation is key to good grass cover. Seedbed must be loose at the time of seeding, disk or track to loosen soil. If seedbed preparation is not feasible add 50% more seed to the recommended mixture. Test soil, apply lime to bring soil ph to a suitable range (ph 6.0) for the planned seed species. In absence of a soils test, 3 tons / acre of lime may be applied. When reseeding the drilling site, roadway, etc., work with landowners and try to use a seed mixture that would be compatible with adjacent grasslands.
29 HYDROSEEDING
30 PERMANENT SEEDING Permanent vegetative cover will be established where no further soil disturbance is anticipated or needed. Soil fertility and ph level should be tested and adjusted according to seed species planted. Planting of permanent vegetative covers must be performed on all disturbed areas after the completion of the drilling process. Any site that contains significant amounts of topsoil shall have the topsoil removed and stockpiled when feasible. Topsoil should not be added to slopes steeper than 2:1 unless a good bonding to the sub-layer can be achieved. After proper grading and seedbed preparation, the vegetation will reestablish ground cover for the control of surface water runoff and erosion. All required seedbed preparation, loosening of soil by disking or dozer tracking, should be performed just prior to seeding.
31 MULCHING The application of straw, hay or other suitable materials to the soil surface to prevent erosion. Straw made from wheat or oats is the preferred mulch, the use of hay is permissible, but not encouraged due to the risk of spreading invasive species. Mulch must be applied to all temporary and permanent seeding on all disturbed areas Mulches conserve desirable soil properties, reduce soil moisture loss, prevent crusting and sealing of the soil surface and provide a suitable microclimate for seed germination
32 FINAL SITE CONSTRUCTION
33 FINAL SITE CONSTRUCTION
34 POST RECLAMATION SITE
35 QUESTIONS
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