SECTION EROSION CONTROL PART 1 GENERAL. A. Work covered by this Section includes the control of erosion, siltation and sedimentation.

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1 SECTION EROSION CONTROL PART 1 GENERAL 1.01 DESCRIPTION A. Work covered by this Section includes the control of erosion, siltation and sedimentation. B. Related work specified elsewhere includes: 1.02 PROJECT REQUIREMENTS Clearing & Grubbing Site Grading Excavating, Trenching & Backfilling Soil Compaction Restoration of Surfaces Topsoil & Seeding A. Take every reasonable precaution and do whatever is necessary to avoid any erosion and to prevent silting of the recharge basin, drainage and other pipes, drainage ditches and swales. See additional requirements, Section B. The exposure of uncompleted cut slopes, embankments, trench excavations, and site graded areas shall be kept as short as possible. Initiate seeding and other erosion control measures on each segment as soon as reasonably possible. C. Should it become necessary to suspend construction for any length of time, shape all excavated and graded areas in such a manner that runoff will be intercepted and diverted to points where minimal erosion will occur. Provide and maintain temporary erosion and sediment control measures, such as berms, dikes, slope drains, silt stops, and sedimentation basins, until permanent drainage facilities and erosion control features have been completed and are operative. D. Fine material placed or exposed during the work shall be so handled and treated as to minimize the possibility of its reaching any surface waters or recharge basin. Use diversion channels, dikes, sediment traps, or other approved and effective control measures

2 E. Provide silt stops wherever erosion control measures may not be totally capable of controlling erosion, such as at the basin side slopes. F. Before water is allowed to flow into any portion of the drainage and recharge system, install the permanent erosion control measures in the waterway so that the waterway will be safe against erosion. G. Take special precautions in the use of construction equipment to minimize erosion. Do not leave wheel tracks where erosion might begin. H. Mulching shall follow the seeding operation by not more than twenty-four (24) hours. I. Should any protective measures employed indicate any deficiencies or erosion taking place, immediately provide additional materials or employ different techniques to correct the situation and to prevent subsequent erosion. J. Continue erosion control measures until the permanent measures have been sufficiently established and are capable of controlling erosion on their own. K. Comply with all Federal, State, and Local laws, ordinances, rules and regulations HAY MULCH PART 2 PRODUCTS A. General Hay mulches shall be reasonably free from swamp grass, weeds, twigs, debris and other deleterious material, and free from rot, mold, primary noxious weed seeds, and rough or woody materials. Mulches containing mature seed of species which would volunteer and be detrimental to the permanent seeding, or would result in overseeding, or would produce growth which is aesthetically unpleasing, is not permitted. B. Hay Mulch Properly aired native hay, Sudan grass hay, broomsedge hay, legume hay or similar hay or grass mowings. When air-dried in the loose state, the contents of the representative

3 bale shall lose not more than fifteen (15) percent of the resulting airdry weight of the bale. Apply at the rate of two (2) tons/acre. C. Mulch Stabilizers Asphalt binder, AASHTO M140, Type SS-1 or RS-1 as applicable, applied at the rate of 400 gals./acre (150 gals/ac. for basin side slopes). D. Temporary Type Mulch Nets Paper yarn, approximately 0.05 in diameter, woven into a net with approximate openings of ⅞ by ½ and weighing about 0.20 lbs/sy. E. Permanent Type Mulch Nets Vexar or Erosion-Net plastic or nylon mesh netting with approximate openings of ⅜ by ¾ MATTING/BLANKETS A. Nomenclature The various materials under this Paragraph are sometimes referred to as matting and blankets. These words are interchangeably used throughout this Section, but the meanings shall be the same. B. Jute Matting Undyed and unbleached jute yarn woven into a uniform open, plain weave mesh, furnished in rolled strips conforming to the following physical requirements: Width - 48, plus or minus 1-78 warp ends per width of cloth - 41 weft ends per yard Weight lbs./ly, plus or minus 5% C. Excelsior Matting Uniform web of interlocking wood excelsior fibers with a backing of mulchnet fabric on one side only. The mulchnet shall be woven of either twisted paper chord or cotton chord. Excelsior matting shall be furnished in rolled strips and shall conform to the following physical requirements: Width - 36 plus or minus 1 Weight lbs/sy plus or minus 5% D. Erosion Control Mulching Blanket Hold/Gro by Gulf States Paper Corp., or approved equal

4 E. Staples No. 11 (or heavier) plain iron wire, made from at least 12 lengths of wire bent to form a U of 1 ½ to 2 in width. Use longer staples for loose soils or where otherwise required HYDROMULCHES A. Hydromulches are not permitted where the slope of the ground surface exceeds 1%. B. Wood fiber mulch with tackifier equal to Genaqua 743 or Terra Tack III. Apply wood fibers at the rate of 500 lbs/ac. and tackifier at the rate of gals/ac. C. Paper mulch equal to Spra-Mulch by Rumose Products Co., applied at the rate of 1,200 lbs./ac SEED AND SOD FOR EROSION A. For Temporary Control Annual or perennial ryegrass (not permitted for basin side slopes). B. For Permanent Control See Section HAY BALES FOR EROSION CONTROL A. Rectangular shaped bales of hay or straw, weighing at least 40 pounds per bale, free from primary noxious weed seeds and rough or woody materials SILT FENCES A. Geofab Silt Fence by Mercantile Development, Inc., Mirafi 100X by Celanese Fibers Marketing Co., or an approved equal. B. Permanent timber silt fence is indicted on the Drawings HAY MULCHING PART 3 - EXECUTION A. Install hay mulch immediately after each area has been properly prepared. When permanent seed or seed for erosion control is sown prior to placing the mulch, place mulch on seeded areas within twenty-four (24) hours after seeding. Engineer may authorize the

5 blowing of chopped mulch provided that 95% of the mulch fibers will be 6 or more in length and that it can be applied in such a manner that there will be a minimum amount of matting that would retard the growth of plants. Hay mulch should cover the ground enough to shade it, but the mulch should not be so thick that a person standing cannot see the ground through the mulch. Remove matted mulch or branches. B. Where mild winds may blow the mulch, or when ground slopes exceed 15%, or when otherwise required to maintain the mulch firmly in place, apply a system of pegs and strings, an asphalt stabilizer, or temporary type netting to the mulch. Unless otherwise directed, remove the strings and netting prior to the acceptance of the Work. C. Where high winds exist, or heavy rainstorms are likely, or where ground surfaces are steep, or where other conditions require, apply temporary type netting over the mulch and take whatever measures are necessary to maintain the mulch firmly in place. D. Unless otherwise specified, the use of permanent type netting is not permitted without the prior approval of Engineer MATTING/BLANKETS GENERAL A. The use of mulch with matting is not permitted, however, a 4 to 6 overlap of mulch over the edge of matting is permissible. B. Prepare surfaces of slopes to conform to the grades, contours and cross sections shown on the Drawings and finish to a smooth and even condition with all debris, roots, stone, and lumps raked out and removed. Loosen the soil surface to permit bedding of the matting. Place seed prior to the placement of the matting. C. Unroll matting parallel to the direction of flow of water and loosely drape, without folds or stretching, so that continuous ground contact is maintained. D. On slopes, each upslope and each downslope end of each piece of matting shall be placed in a 6 trench, stapled at 12 on center, backfilled, and tamped. Similarly, bury edges of matting along the edges of catch basins and other structures. Engineer may require that any other edge, exposed to more than normal flow of water, be buried in a similar fashion

6 E. Tightly secure matting to the soil by staples driven approximately vertically into the ground, flush with the surface of the matting. In driving the staples, take care not to form depressions or bulges in the surface of the matting. F. Decrease the specified spacing of staples when varying factors, such as the season of the year or the amount of water encountered or anticipated, requires additional anchoring. G. Refer to the following paragraphs for additional requirements on the placement and stapling of matting JUTE MATTING A. Where strips are laid parallel or meet, as in a tee, they shall be overlapped at least 4. Overlap ends at least 6, shingle fashion. B. Space check slots, built at right angles to the direction of flow of water, so that one check slot or one end occurs within 50 of length of slope. Construct check slots by placing a tight fold of matting at least six (6) inches vertically into the ground. These shall be tamped the same as the upslope ends. C. Press jute matting onto the ground with a light lawn roller or other satisfactory means. D. On slopes flatter than 1:4, place staples not more than 3 apart in three (3) rows, for each strip, with one (1) row along each edge and one (1) row alternately spaced down the center. On grades 1:4 or steeper, place staples in the same three (3) rows, but spaced 2. On lapping edges, double the number of staples, with the spacing halved. Ends of matting and all required check slots shall have staples placed every foot. Matting placed adjacent to boulders or other obstructions shall be stapled with no spaces between the staples. E. Spread additional seed over jute matting, particularly those locations disturbed by the building of slots EXCELSIOR MATTING A. Where strips of excelsior matting are laid end to end, butt the adjoining ends

7 B. When adjoining rolls of excelsior matting are laid parallel to one another, butt the matting snugly. C. Meet all the applicable portions of Paragraph 3.04D EROSION CONTROL MULCHING BLANKET A. Where one roll ends and a second roll begins, the upslope piece shall be brought over the end of the downslope roll so that there is a 12 overlap, placed in a 4 deep trench, stapled at 12 on center, backfilled and tamped. B. On slopes where two (2) or more widths of blanket are applied, the two edges shall be overlapped 4 and stapled at 12 intervals along the exposed edge of the lap joint. C. Staple the body of the blanket in a grid pattern with staples 3 on center, each way SEED FOR EROSION CONTROL A. Seeding for erosion control shall be carried out in accordance with Section B. Areas which will be regarded or otherwise disturbed later during construction may be ordered to be seeded with rye grass to obtain temporary control. The seed shall be sown at the rate of approximately one pound per 1,000 square feet, on the pure live basis. The basin side slopes shall be seeded only on the basis and with the seed type as specified in Section HAY BALES & SILT FENCES A. Provide hay bales or silt fences, as required, for the temporary control of erosion and to stop silt and sediment from reaching the recharge basin, surface waters, adjacent properties, or entering catch basins, or damaging the Work. B. Stake the hay bales to hold them firmly in place. Use a sufficient number of bales to accommodate runoff without causing any flooding and to adequately store any silt, sediment and debris reaching them

8 C. Erect silt fences and bury bottom edge in accordance with the manufacturer s recommended installation instructions. Provide above top of slope of basin, wherever surrounding lands might drain into basin. Provide a sufficient length of fence to accommodate runoff without causing any flooding and to adequately store any silt, sediment and debris reaching it. D. Leave hay bales and silt fences in place until permanent erosion control measures have stopped all erosion and siltation MAINTENANCE A. If any staples become loosened or raised, or if any matting becomes loose, torn, or undermined, or if any temporary erosion and sediment control measures are disturbed repair them immediately. B. If seed is washed out before germination, repair any damage, refertilize and reseed. C. Maintain mulched and matted areas, silt stops, and other temporary control measures until the permanent control measures are established and no further erosion is likely. END OF SECTION

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