734 Page 495734 EROSION CONTROL AND WATER POLLUTION CONTROL
734.1DESCRIPTION
This work consists of permanent and temporary measures to control erosion, sedimentation, and water pollution.
734.2MATERIALS
A.Water Pollution Control: Materials used in water pollution control work will conform to the requirements set forth in the contract. When work is ordered for which no provisions are contained in the contract, material requirements will be set forth in the agreement covering the additional work. B.Temporary Erosion Control: 1.Silt Fence: Silt fence will consist of a temporary vertical barrier of fabric attached to and supported by woven wire and wood or steel posts and entrenched into the ground. Only silt fence on the Department’s Approved Products List will be allowed. a.Woven Wire: Woven wire will be 26 inch wide, 14½ gauge and have six horizontal wires with 6 inch or 12 inch spacing of vertical stay wires. Woven wire is required for low flow silt fence installations. Woven wire is not required, unless specified in the plans or ordered by the Engineer, for high flow silt fence installations. b.Posts: The posts used will be steel T line posts with 5 foot minimum length or wood posts with 5 foot minimum length and 3 inch minimum diameter. 2.Erosion Control Wattles: Erosion control wattles will consist of weed free straw, excelsior, or coconut husk encased in ultraviolet degradable or biodegradable netting. Anchors for erosion control wattles will be wooden or other biodegradable stakes. Only erosion control wattles on the Department’s Approved Products List will be allowed. 3.Erosion Bales: Erosion bales will consist of hay or straw bales free of noxious weeds. Erosion bales with noxious weed contamination will be rejected and the Contractor will remove the contaminated bales from the project. 4.Erosion Bale Anchors: The erosion bale anchors will be as detailed in the plans. C.Permanent Erosion Control: 1.Erosion Control Blanket: When called for in the plans, erosion control blanket will be used to prevent erosion in ditches and on roadway slopes. The blanket will be installed in accordance with the plans. Only designated erosion control blanket on the Department’s Approved Products List will be allowed. 2.Turf Reinforcement Mat: When called for in the plans, turf reinforcement mat will be used to prevent erosion in ditches and on roadway slopes. The mat will be installed in accordance with the plans. Only designated turf reinforcement mat on the Department’s Approved Products List will be allowed. 734 Page 496734.3 CONSTRUCTION REQUIREMENTS The Contractor will designate an employee as Erosion Control Supervisor whose primary responsibility is the construction and maintenance of erosion and sediment control. This person will be available to be reached by phone 24 hours a day, 7 days a week, and must be able to respond to emergency situations at the job site within 12 hours. The person so designated must have training and be certified by the South Dakota Department of Transportation in the area of erosion and sediment control. The name, phone number, and location of the person will be provided to the Department at the preconstruction meeting. Erosion control and water pollution control devices will be inspected by the Contractor and Engineer in accordance with the storm water permit and the plan notes. The Engineer will document these inspections on a DOT-298 form. A.Water Pollution Control: These temporary pollution control provisions will be coordinated with the permanent erosion control features specified elsewhere in the contract to the extent practical to assure economical effective and continuous erosion control throughout the construction and post- construction period. The Contractor will be required to perform water pollution control measures in the sequence and manner outlined in the contract. Additional water pollution control measures found necessary after award of the contract will be performed at such times and in the sequence ordered. At the preconstruction conference, the Contractor will submit for approval to the Engineer, a proposed schedule and method of operation for performance of temporary and permanent water pollution control measures. The Engineer has the authority to direct the Contractor to provide immediate permanent or temporary pollution control measures to prevent contamination of adjacent streams or other watercourses, lakes, ponds, wetlands, or other areas of water impoundment. Such work may involve the construction of temporary structures, berms, dikes, dams, sediment basins, slope drains, and use of temporary mulches, rolled erosion control products, seeding, or other control devices or methods as necessary to control erosion. Pollutants used during construction will be stored or disposed of where runoff will not carry them into streams or lakes. Pollutants will not be disposed of in streams or lakes. Contractor equipment yards and service areas will be located or bermed so runoff from the areas and pollutants do not reach waterways or impoundments of water. If conflicts between these requirements and pollution control laws, rules, or regulation of other Federal or State or local agencies occur, the more restrictive laws, rules or regulations will apply. B.Temporary Erosion Control: The Contractor will not begin the removal of surfacing or topsoil until all temporary erosion control measures are placed beyond the work limits but within the right-of-way or easement. The Contractor will not begin earth moving operations 734 Page 497in a third mile until erosion control measures within the work limits have begun in the first mile. Erosion control measures will be continued in an orderly and progressive manner. 1.Silt Fence: Silt fence will be in place at locations designated on the plans or at locations selected by the Engineer before earth disturbing activities have begun. Exceptions are at those areas where it is impractical to do so because of interference with construction activities. These exceptions must be approved by the Engineer. Silt fence may also be used during construction for interim sediment control. When a trench cannot be dug, 30 to 40 pound sandbags may be used to prevent underflow at the bottom of the silt fence. Silt fence will be constructed according to the plans. a.Mucking Silt Fence: Mucking silt fence is the removal of muck trapped by the silt fence and spreading the material evenly over the adjacent area to conform to the grade. The muck will be removed when the surface of the muck is at approximately one-third the height of the silt fence. b.Repair Silt Fence: Repair of silt fence will be as directed by the Engineer. This item will consist of repairing silt fence to meet installation requirements specified in the plans. c.Remove Silt Fence: Silt fence will be removed when vegetation is established. Some or all silt fence may be required to be left on the project until vegetation is established. 2.Erosion Control Wattle: Erosion control wattle will be in place at locations designated on the plans or at locations selected by the Engineer. Exceptions are at those areas where it is impractical to do so because of interference with construction activities. These exceptions must be approved by the Engineer. Erosion control wattle may be placed before earth moving activities begins and during construction for interim erosion and sediment control. a.Remove and Reset Erosion Control Wattle: The Contractor will remove and reset erosion control wattles as necessary as work progresses. The erosion control wattles removed and reset will be in useable condition. b.Remove Erosion Control Wattle: Erosion control wattles will be removed when vegetation is established. Some or all erosion control wattles may be required to be left on the project until vegetation is established. 3.Floating Silt Curtain: Floating silt curtain will be placed at locations designated in the plans. The placement will be prior to earth disturbing activities, including clearing and grubbing, upstream or adjacent to the location of the floating silt curtain. 4.Erosion Bales: Erosion bales will be installed as shown on the plans or as directed by the Engineer. 5.Erosion Bale Anchors: The erosion bale anchors will be as detailed in the plans. 734 Page 498C.Permanent Erosion Control: This work will be done as soon as possible after finish grading and topsoil placement is completed, and if practical, prior to seeding, fertilizing, and mulching of adjacent areas. Seasonal limitations on the installing of erosion treatment material will be as provided in Section 730.3 . 1.Preparation of Areas to be Treated: a.Shaping: Ditches and medians will be reshaped to their typical section or to the ditch section specified for ditch liner material. Material will be laid in ditches and medians to the widths specified. When watercourses leading out of ditches are shallow or not well defined, special channels will be constructed and undercut to allow for placement of topsoil. The material will be placed below edges of channels and excavated material drifted back away from the edges of the material to direct flow directly into the treated waterway. b.Topsoil: Topsoil will be spread to the depths specified over reshaped areas in accordance with Section 230. c.Condition of Finished Surface: Rocks and clods, over 1½ inch in diameter, and other foreign material will be removed prior to placing material. 2.Seeding and Fertilizing: Immediately after the area to be treated has been shaped and smoothed and prior to placing permanent erosion control, the areas to be treated will be seeded and fertilized as prescribed in Section 730 and Section 731. Broadcasting, raking, or dragging in of seed and fertilizer will be permitted on areas where a drill cannot operate satisfactorily. 3.Application of Erosion Control Blanket and Turf Reinforcement Mat: a.Manner of Application: Material will be applied beginning at the top of the slope or ditch grade and rolling downward, parallel to and in the same direction as the flow of water. The center strip will be placed first and centered in the low point of the ditch or channel throughout the length of treatment. b.Overlap: Where more than one width of material is required, edges will overlap approximately 4 inches, and ends will overlap approximately 6 inches, with the upslope section of material on top. c.Trench: The top or upslope end will be buried in a trench 6 inch deep by 6 inch wide and stapled. The trench will be backfilled to grade and compacted. d.Anchoring: Prior to anchoring, adjust erosion blanket or turf reinforcement mat laterally in ditches and channels to bring both edges to the same elevation. Material 734 Page 499will be held in place in accordance with the manufacturer’s recommended spacing and pattern, or the following: Manufacturer's recommendations will be submitted to the Engineer prior to installation. Material will not be drawn taut in stapling. Material which bridges over surface depressions will be secured with extra staples or T pins to ensure good contact with the soil. e.Maintenance and Repair: The Contractor will maintain the areas where material has been used until work in the project has been completed and the Acceptance of Field Work is issued by the Area Office. Prior to the date the Acceptance of Field Work is issued damaged areas will be repaired.
734.4METHOD OF MEASUREMENT
A.Silt Fence will be measured to the nearest foot. B.Mucking Silt Fence will be measured to the nearest cubic yard. C.Repair Silt Fence will be measured to the nearest foot. D.Remove Silt Fence will be measured to the nearest foot. E.Erosion Control Wattle: Erosion control wattle will be measured to the nearest foot. F.Remove and Reset Erosion Control Wattle: Remove and reset erosion control wattle will be measured to the nearest foot. G.Remove Erosion Control Wattle: Remove erosion control wattle will be measured to the nearest foot. H.Floating Silt Curtain will be measured to the nearest foot. Silt curtain damaged from causes beyond the control of the Contractor will be replaced and the replacement quantity added to the original contract amount. I.Erosion Bales will be measured by the actual count of bales placed. J.Erosion Control Blanket will be measured to the nearest square yard. Measurement of the overlap and top and bottom folds will not be made. Erosion control blanket damaged from causes beyond the control of the Contractor will be replaced and the replacement quantity added to the original quantities used. K.Shaping for Erosion Control Blanket will be measured to the nearest foot. L.Turf Reinforcement Mat: Turf Reinforcement Mat will be measured to the nearest square yard. Measurement of the overlap and top and bottom folds will not be made. Turf reinforcement mat damaged from causes beyond the control of the Contractor will be replaced and the replacement quantity added to the original quantities used 734 Page 500M.Topsoil will be measured for as provided in Section 230. N.Seed will be measured for as provided in Section 730. O.Fertilizer will be measured for as provided in Section 731.
734.5BASIS OF PAYMENT
A.Silt Fence will be paid for at the contract unit price per foot. Payment will be full compensation for furnishing, installing, labor, equipment, and incidentals. B.Mucking Silt Fence will be paid for at the contract unit price per cubic yard. Payment will be full compensation for labor, equipment and incidentals required to remove, spread this material evenly over the adjacent area as determined by the Engineer, and seed. C.Repair Silt Fence will be paid for at the contract unit price per foot. Payment will be full compensation for repair and inspection of the silt fence. D.Remove Silt Fence will be paid for at the contract unit price per foot. Payment will be full compensation for labor, equipment, and incidentals. E.Erosion Control Wattle: Erosion control wattle will be paid for at the contract unit price per foot. Payment will be full compensation for labor, equipment, and incidentals. F.Remove and Reset Erosion Control Wattle: Remove and reset erosion control wattle will be paid for at the contract unit price per foot. Payment will be full compensation for labor, equipment, and incidentals. G.Remove Erosion Control Wattle: Remove erosion control wattle will be paid for at the contract unit price per foot. Payment will be full compensation for labor, equipment, and incidentals. H.Floating Silt Curtain will be paid for at the contract unit price per foot. Payment will be full compensation for materials, labor and equipment necessary to install and remove the floating silt curtain. I.Erosion Bales will be paid for at the contract unit price for each bale. Payment will be full compensation for furnishing, installing, all labor, equipment, and incidentals. J.Erosion Control Blanket will be paid for at the contract unit price per square yard. Payment will be full compensation for shaping and finishing ditches and channels, which are not specifically addressed with the item "shaping for erosion control blanket", installing material and the furnishing of labor, equipment, staples, material, and incidentals necessary. K.Shaping for Erosion Control Blanket will be paid for at the contract unit price per foot. Payment will be full compensation for labor, equipment, and incidentals. L.Turf Reinforcement Mat: Turf reinforcement mat will be paid for at the contract unit price per square yard. Payment will be full compensation for shaping and finishing ditches and 734 Page 501channels, installing material and the furnishing of labor, equipment, staples, material, and incidentals necessary. M.Topsoil will be paid for as provided in Section 230. N.Seed will be paid for as provided in Section 730. O.Fertilizer will be paid for as provided in Section 731. 740 Page 502740 AGGREGATES FOR MAINTENANCE STOCKPILES
740.1DESCRIPTION
This work consists of furnishing and stockpiling the type and size aggregate specified in the plans.
740.2MATERIALS
The aggregate will conform to the requirements in the plans.
740.3CONSTRUCTION REQUIREMENTS
Materials will be proportioned, blended, and crushed (when required) in accurately measured quantities. The aggregate will be placed in neatly shaped storage piles on suitably prepared sites at the location designated in the plans.
740.4METHOD OF MEASUREMENT
Aggregate will be measured to the nearest 0.1 ton, furnished, delivered, and neatly stockpiled.
740.5BASIS OF PAYMENT
Aggregate will be paid for at the contract unit price per ton. Payment will be full compensation for furnishing materials, labor, equipment, and incidentals required.