The filling of silt basins , diversions or silt ditches will be paid as provided in Article 225-7 for Unclassified Excavation or in Article 230-5 for Borrow Excavation, depending on the source of the material used to fill the basins or ditches. Payment will be made under: Pay Item Pay Unit Silt Excavation Cubic Yard
ROLLED EROSION CONTROL PRODUCTS -1 DESCRIPTION Furnish, place and maintain a rolled erosion control product (matting) on previously shaped and seeded drainage ditches, slopes or other areas at locations shown in the c ontract or as directed by the Engineer . Work includes providing all materials , excavation and backfilling, placing and securing matting and maintaining the drainage ditch. The conditions which occur during the construction of the project will determine the quantity of matting placed. The quantity of matting may be increased, decreased or eliminated entirely as directed by the Engineer . Such variations in quantity will not be considered as alterations in the details of construction or a change in the character of the work. -2 MATERIALS Refer to Division 10. Item Section Matting for Erosion Control 1060 -8 Staples 1060 -8(D) -3 CONSTRUCTION METHODS Place matting immediately following seeding. Provide a smooth soil surface free from stones, clods or debris that will prevent the contact of the m atting with the soil. Preserve the required line, grade and cross section of the area covered. Unroll matting in the direction of the flow of water and apply without stretching so that it will lie smoothly but loosely on the soil surface. Bury the up- channel or top of slope end of each piece of matting in a narrow trench at least 6 inches deep and tamp firmly. Where one roll of matting ends and a second -roll begins, overlap the end of the upper roll over the buried end of the second roll so there is a 4 inch overlap. Construct staple checks 4 inches on center and every 30 feet longitudinally in the matting or as directed by the Engineer . Fold ove r and bury matting to the full depth of the trench, close and tamp firmly. Overlap matting at least 4 inches where 2 or more widths of matting are laid side by side. Place staples across matting at ends, junctions and check trenches approximately 10 inches apart. Place staples along the outer edges and down the center of each strip of matting 3 f eet apart. Place staples along all lapped edges 10 inches apart. Install product with netting on the top side when excelsior or straw matting is used. The Engineer may require adjustments in the trenching or stapling requirements to fit individual cut or fill slope conditions . -4 MEASUREMENT AND PAYMENT Matting For Erosion C ontrol will be measured and paid in square yards as measured along the surface of the ground, over which matting has been acceptably placed.