206Perimeter Erosion Controls

— PERIMETER EROSION CONTROLS

206.01DESCRIPTION

This work includes providing erosion, sediment, and pollution prevention controls in reasonably close conformity with the required dimensions and details . Erosion, sediment, and pollution prevention controls include the following four types . Ensure that a ll erosion, sediment, and pollution prevention controls and devices are in place before the start of excavation when required by the SWPPP/SESC and other Contract Documents. SECTION 907 addresses dust control to reduce dust nuisance and hazards. Baled Straw Erosion Checks. Baled straw erosion checks include baled straw, each bale of which is embedded and attached to the ground with wooden stakes. Silt Fence. Silt fencing includes oak fence posts to which are attached industrial support netting and sediment control filter fabric. Baled Straw Erosion Check and Silt Fence Combined. Baled straw erosion checks and silt fence combined includes baled straw erosion check installed abutting the filter fabric side of a silt fence, with a minimum of 6 in. along the bottom edge of the silt fence toed in under the baled straw erosion check. Compost Filter Sock. Compost filter socks include a flexible mesh tube filled with composted material and staked to the ground with wooden stakes. Surface Erosion Controls. This work includes providing surface erosion and sediment control devices on previously shaped and seeded areas at the required locations.

206.02MATERIALS

Baled Straw Erosion Checks. Ensure that baled straw is baled within 12 months of use. Ensure that bindings are sufficiently strong to act as handles when placing bales in position by hand . Use a minimum dimension for bales of 18 in. Use wooden oak stakes, 1-in. × 1-in. in section and at least 3 ft in length.

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Silt Fence. Ensure that the filter fabric consists of a material suitable for erosion control applications and is included on the Department’s Approved Materials List . Use wooden oak posts, 2-in. × 2-in. in section and at least 4.5 ft in length . Use s upport netting of heavy-duty plastic mesh . For prefabricated silt fences, 1-in. × 1-in. wooden posts will be permitted. Baled Straw Erosion Check and Silt Fence Combined. Ensure that baled straw conforms to Subsection 206.02.1. Ensure that silt fencing conforms to Subsection 206.02.2. Compost Filter Sock. Ensure that c ompost filter sock material contains composted organic matter according to AASHTO Designation R 51- 13 and meets all applicable Federal and State regulations. For compost filter socks 18 in. or less in diameter, use wooden stakes 1 in. × 1 in., at 10-ft intervals on center, and of a length that projects into the soil 1 ft leaving 3 in. to 4 in. protruding above the filter sock. For compost filter socks greater than 18 in. in diameter, use wooden stakes 2 in. × 2 in., at 10-ft intervals on center, and of a length that projects into the soil 1 ft, leaving 3 in. to 4 in. protruding above the filter sock. Use filter sock netting materials made of biodegradable materials if to remain in place. Surface Erosion Controls. Ensure that the erosion control mats consist entirely of biodegradable materials. Do not use materials that are bleached, dyed, or otherwise treated with a material or in a manner that will result in toxicity to seeding, soil, or vegetation. Use erosion controls that are non-toxic to plants, soil, or unprotected human skin.

stabilizer type, mix, and application rate according to the manufacturer’s requirements and as directed by the Engineer.

traw Mating. Use straw matting that consists of a machine-produced mat of clean, weed free, 100 percent grain straw. Ensure that the width is 40 in. to 90 in. and that the matting weighs between 0.50 and 0.75 lb/sq yd. Evenly distribute the straw throughout the mat with a thickness between ⅜ in. and ⅝ in. Cover the top of the blanket with a photodegradable plastic mesh with opening sizes between ⅜ in. and 1 in. Ensure that the mesh adheres to the straw by a knitting process using biodegradable thread.

ute Matting (Mesh) . Ensure that this natural biodegradable product consists of a uniform, plain weave of undyed and unbleached, smolder resistant, natural spun single jute yarn. Ensure that the material is at least 4 ft wide, weighs 1.2 lb/linear yd and has approximately 78 warp ends per width of cloth and 41 weft ends per yard.

xcelsior Matting. Use an excelsior matting that consists of machine- produced curled wood excelsior mat with at least 80 percent 6-in. or longer fiber with even distribution and consistent thickness. Ensure that the fiber diameter is between 0.015 in. and 0.15 in. For

Part 200 — Earthwork and Erosion Control August 2025

standard weight product, cover the top of the blanket with a polypropylene mesh with ⅜- in.to 3-in. openings. Ensure that the dry blanket weight is at least 0.80 lb/sq yd. For heavy duty product, cover the top of the blanket with polypropylene mesh with ⅜-in. to 1½ -in. openings. Ensure that the dry blanket weight is at least 1.4 lb/sq yd.

or T shape with 6 in. or longer vertical legs. Ensure that the horizontal measurements of staples are longer than two mesh opening diameters. Longer staples may be required for looser soils.

206.03CONSTRUCTION METHODS

Install the required pollution controls before initiating any drainage, roadway, or bridge construction or disturbance of any soils. Baled Straw Erosion Checks.

● Arrange bales in a single row, lengthwise on the contour, with ends of adjacent bales tightly abutting one another. ● Entrench and backfill the erosion check. Excavate the trench so that the width of the bale and the length of the check is a minimum depth of 3 in. After the bales are staked and chinked, backfill the excavated soil against the check . Ensure that the backfill conforms to the ground level on the downhill side and is built up to 4 in. against the uphill side. ● Install the bales so that the bindings are oriented around the sides of the bales rather than along their tops and bottoms. ● Securely anchor each bale with at least two stakes driven through the bale. Drive the first stake in each bale toward the previously laid bale to force the bales together. ● Ensure that the gaps between bales are chinked (filled by wedging) with straw to prevent water from escaping between bales . Scatter loose straw over the area immediately uphill from the bale erosion check to increase efficiency. ● At approximately 100-ft intervals, place one bale against the bales positioned along the limit of clearing. Place this bale at a right angle to the line of the toe of slope.

Do not remove erosion controls until the adjacent exposed areas are free from future uncontrolled discharges. Remove all baled straw erosion checks from the bales at a time designated by the Engineer. Remove the erosion check only after the adjacent exposed area has been stabilized; i.e., after the area has an established grass or stone cover or has been paved and is free from future uncontrolled discharges . U pon removal of the bales, backfill the remaining exposed areas (under the bales) with plantable soil, raked and graded as necessary to match the surrounding grade and then seeded.

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Silt Fence.

● Dig a 6-in. deep by 1-ft wide minimum trench where the fence will be installed. ● Position the fence in the trench with the fence posts set at 8 ft on center (maximum) in wetland areas and 4 ft on center (maximum) in wetland ravine, gully , or drop-off areas. ● Staple the sedimentation control fabric and the industrial netting to each post. When joints are necessary, splice the filter fabric together only at support posts . Overlap splices 6-in. and securely seal the filter fabric. ● Drive each wood post, with industrial support netting and filter fabric attached, into the undisturbed soil in the trench. ● Backfill the trench and compact the soil over the filter fabric. ● Ensure that the installed height of the fence is 30 in. (minimum) not to exceed 36 in.

not leaves ilt fences in place . Before removal of the fence, remove all accumulated sediment and debris on the upstream side. Do not remove erosion, sediment, and pollution prevention controls until the adjacent exposed areas are free from future uncontrolled discharges. Only remove a silt fence when the adjacent exposed area is stabilized; i.e., the area has an established grass or stone cover or has been paved and is free from future uncontrolled discharges . U pon removal of the silt fence, finish the remaining exposed areas as specified in Para. b of Subsection 206.03.1. Baled Straw Erosion Check and Silt Fence Combined.

Para. a of Subsections 206.03.1 and 206.03.2, with the following additional provisions: ● Install silt fencing before installing the baled straw. ● Ensure that the trench is a minimum of 6-in. deep and has a width sufficiently wide to accommodate the baled straw as it abuts the filter fabric side of the silt fence. ● Before backfilling the trench, install the baled straw tight against the filter fabric side of the silt fence, with a minimum of 6 in. of the bottom edge of the silt fence toed in under the baled straw within the trench.

Para. b of Subsections 206.03.1 and 206.03.2. However, do not allow the baled straw erosion checks to rot in place. Before removal of the combined baled straw erosion check and silt fence, remove all accumulated sediment and debris on the upstream side. Do not remove erosion, sediment, and pollution prevention controls until the adjacent exposed areas are free from future uncontrolled discharges.

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Compost Filter Sock.

● Use compost filter socks either fabricated on-site or delivered to the site. ● Trenching is not required. Place the compost filter socks over the top of ground, and drive the wooden stakes in pairs on each side of the filter socks to secure them to the ground. Cut down or remove heavy vegetation, and grade uneven surfaces to ensure that the compost filter sock uniformly contacts the ground surface. ● Place filter socks in a continuous line. Where ends intersect, use a sleeve to create an interlock with a 2-ft overlap. After one section is filled and the ends tied off, pull the next section over the tied-off end of the previous section to create a 2-ft overlap. Stake the overlap and ensure that the intersecting overlaps do not allow stormwater to break through at the intersection points.

removal, remove all accumulated sediment and debris. Do not remove the erosion, sediment, and pollution prevention controls until the adjacent exposed areas are free from future uncontrolled discharges. Cut open the mesh filter sock material, remove the mesh, rake the compost material out level to the surrounding grades, and then seed. After removal of the compost filter socks, finish the remaining exposed areas as specified in Para. b of Subsection 206.03.1. For biodegradable filter sock netting material, the materials may remain in place, but the Contractor shall cut open, rake out, level up with the ground, and seed. Surface Erosion Controls. Raise the areas to receive surface erosion controls to the required lines and grades with a smooth surface free of depressions and eroded areas that would prevent contact of the matting with the soil or allow water to collect or flow underneath. Install the material immediately after seeding and ensure that the material maintains continuous contact with the underlying soil surface. Unroll matting in the same direction as the surface flow without stretching so that it will lie smoothly to fit the contour of the finished grade. Install the product with netting on the top side. Where one roll of matting ends and a second begins, overlap the end of the upper roll over the end of the second roll to provide a minimum 12-in. overlap. Ensure that side edges overlap a minimum of 4 in. To secure the matting and to prevent flow from getting underneath and eroding the soil, bury the up-slope end of each separate strip or piece of matting, and staple the ends in an anchor trench at least 6 in. deep and 6 in. wide, with the soil firmly tamped after being backfilled, per the manufacturer’s requirements and/or as directed by the Engineer. Anchor the outer edges of the blanketed areas where significant runoff is anticipated in a 6 -in. square trench. Where ditch or channel flow pass onto or over the blanketed areas, secure any overlaps or edges likely to be exposed to greater than normal flow and/or velocities and at locations determined by the Engineer using a staple check. Ensure that the staple checks include two rows of staggered staples positioned 4 in. apart on 4-in centers and placed perpendicular to the flow. Before anchoring the first laid section, adjust the net or blanket laterally in the ditch or channel to raise both edges to approximately the same elevation. Insert staples vertically through the

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matting at terminal ends, lapped ends, junctions, and trench checks not more than 9 in. apart. Place staples along the outer edges, overlapped, and in the center of each strip of matting not greater than 3 ft apart. Mix hydraulic mulch stabilizer in an appropriately sized tank with a built -in, continuous agitation or recirculation system of sufficient operating capacity to produce a homogeneous slurry of product being applied. Apply the slurry in a sweeping motion at the specified rate and at the rate that will provide the designated amounts of mix in a continuous uniform and even coat. Apply the slurry from opposing directions to achieve the best, uniform soil coverage. Ensure that the nozzle is sized to produce a spray that does not concentrate nor wash down the material. Provide a mix and application rate according to the manufacturer’s requirements. Provide the mix and rate of the product to the Engineer for approval before mixing and application. Do not apply hydraulic mulch stabilizer in channels, swales, or other areas where concentrated flows are anticipated, unless installed in conjunction with rolled erosion control products. Perform inspection, maintenance, and repairs of surface erosion controls according to the required environmental permit inspection plans, reports, and procedures, including the SWPPP and/or SESC plan, the specifications, and as directed by the Engineer. If the permits and reports are not part of the Project, inspect the surface erosion controls for failures at least once per week and within 24 hours of the end of each storm event with a rainfall amount of 0.25 in. or greater for the duration for which the controls are installed. Ensure that the inspection includes assessing the surface beneath the blanket to determine if soils and/or seed have washed away from beneath the blanket, and/or if the Engineer determines that the soil surface can be expected to c ontinue to erode, and/or if the blanket has become dislodged from the soil surface or is torn. Make repairs immediately. If washouts or breakouts occur, reinstall the blankets after regrading and reseeding, ensuring that the blanket installation still meets the design specification requirements. If repetitive failures occur at the same location, review the conditions and limitations for use and determine if other measures are needed to prevent or reduce failures. Protect all treated areas from foot and vehicular traffic and other disturbances. Repair any damage using the procedures as specified above, according to the manufacturer’s requirements, and/or as directed by the Engineer If the Engineer determines that these requirements have not been met or if controls are not adequately maintained, then enforcement will be applied according to Subsection 212.03.3.

206.04METHOD OF MEASUREMENT

The following will be measured by the linear feet installed (or removed): • Baled Straw Erosion Checks • Removal of Baled Straw Erosion Check • Silt Fence • Baled Straw Erosion Check and Silt Fence Combined • Compost Filter Sock Surface Erosion Control Matting will be measured by the number of square yards installed.

Part 200 — Earthwork and Erosion Control August 2025

Surface Erosion Control Hydraulic Mulch Stabilizer will be measured by the number of acres installed.

206.05BASIS OF PAYMENT

The Department will pay for the completed and accepted quantities at the Contract unit prices as follows. Pay Item Pay Unit Baled Straw Erosion Checks LF Silt Fence LF Baled Straw Erosion Check and Silt Fence Combined LF Compost Filter Sock LF Surface Erosion Control Matting SY Surface Erosion Control Hydraulic Mulch Stabilizer ACRE Baled Straw Erosion Checks. The price constitutes full compensation for all labor, materials, and equipment, including excavation, bales, stakes, removal of stakes, removal of straw, grading, raking, seeding necessary to match the surrounding area, and all incidentals required to finish the work, complete and accepted. Silt Fence. The price constitutes full compensation for all labor, materials, and equipment , including excavation, filter fabric, industrial netting, posts, removal of fence, grading, raking and seeding necessary to match the surrounding area, and all incidentals required to finish the work, complete and accepted. Baled Straw Erosion Check and Silt Fence Combined. The price constitutes full and complete compensation for all labor, materials, and equipment, including excavation, filter fabric, baled straw, stakes, industrial netting, posts , removal of baled straw, removal of fence, backfill material, grading, raking and seeding as necessary to match the surrounding area, and all incidentals required to finish the work, complete and accepted. Compost Filter Sock. The price constitutes full compensation for all labor, materials, and equipment, including mesh filter socks, removal of mesh filter socks, compost filter material, stakes, removal of stakes, grading, raking and seeding as necessary to match the surrounding area, and all incidentals required to finish the work complete and accepted.

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Cleaning and Maintenance. The cleaning and maintenance of Baled Straw Erosion Checks, Silt Fence Erosion Checks, Baled Straw Erosion Check and Silt Fence Combined, and Compost Filter Sock will be paid for according to SECTION 212 . Maintenance includes the removal and proper disposal of all entrapped material. Surface Erosion Controls Matting and Hydraulic Mulch Stabilizer. The prices constitute full compensation for all labor, materials, equipment, tools, inspections, maintenance, and other incidentals necessary to finish the work, complete and accepted.