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P 03 1 i'' li 628.1 When the kind of mat is not specified in the contract,either jute fabric, wood fiber blanket or fiber glass roving shall be furnished by and at the option of the contractor. Erosion Bales shall consist of furnishing and placing bales of straw, hay or other suitable baled material to form checks or dikes to control erosion,at locations designated on the plans or directed by the engineer. Silt Fence shall consist of furnishing,erecting,maintaining and removing a gcotexlile fabric fence and suitable support structure for retention of silt at locations designated on the plans or directed by the engineer. Silt Screen shall consist of furnishing, installing, maintaining and removing a silt screen barrier at locations designated on the plans or directed by the engineer. Cleaning Sediment Basins shall consist of the excavation and disposal of sediment from sediment basins. Mobilizations,Erosion Control shall consist of the work and operations necessary for the movement of personnel,equipment and materials to the project site to permit Con- 1 '' struction of erosion control items at the stages indicated in the contract or directed by the engineer.The delivery of those materials provided for in specific delivered bid items in the contract shall not be a part of this work. 628.2 Materials. 628.2.1 Jute Fabric.The material intended for use for erosion mat shall be a woven ' fabric of a uniform open weave of single jute yarn. The jute yarn shall be of loosely " • .' twisted construction having an average twist of not less than one and one-half turns per inch. The average size of the warp and weft yarns shall be approximately the same.The �., woven fabric shall be furnished in rolled strips,The width of the strips shall be 48 inches, plus or minus one inch.The full width of the strip shall have 78 warp ends,plus or minus one,The fabric shall have 41 weft yarns,plus or minus two,per linear yard of length.The ' weight of the fabric measured under average atmospheric conditions shall be 92 pounds per 100 square yards, plus or minus ten percent. The fabric shall be non-toxic to, vegetation, A 628,2.2 Wood Fiber Blanket.The material intended for use for erosion mat shall be a uniform web of interlocking wood excelsior fibers,with a net backing on one side.The wood from which the blanket is produced shall have been properly cured to achieve adequately curled and barbed fibers.The blanket shall be of uniform thickness with the wood fibers evenly distributed over the entire area of the blanket. The blanket shall be furnished in rolled strips. The width of the strips shall be 48 inches, plus or minus 1' inch.The weight of the blanket measured under average atmospheric conditions shall 78 pounds per 80 square yards,plus or minus ten percent.The net backing shall havq mesh size not exceeding 1-1/2 by 3 inches and may be woven from twisted paper,cott . cord,a biodegradable plastic or other approved material.The blanket shall be non-to to vegetation. 628.2.3 Fiber Glass Roving. The material shall be formed from continuous 6 drawn from molten glass,coated with a chrome-complex sizing compound,collected int strands and lightly bound together into roving without the use of clay, starch,or 11 deleterious substances, The roving shall be wound into a cylindrical package apprq Li mately one foot high in such a manner that the roving can be continuously fed froth center of the package through an ejector driven by compressed air and expanded it mat of glass fibers on the soil surface.The material shall contain no petroleum solvents k'+ other agents known to be toxic to plant or animal life. The fiber glass roving shall conform to the following requirements: 466 { 1