3887.1SCOPE
Provide flotation Silt curtain to contain suspended sediment and floating debris in open water.
3887.2REQUIREMENTS
Provide floatation Silt curtains meeting the following requirements and characteristics:
extending below the flotation portion of the curtain, and Table 3887.2-1
Table 3887.2-1 Flotation Silt Curtain Requirements Characteristic Type Light Duty Heavy Duty Curtain fabric Material type Impermeable, vinyl-nylon laminate Impermeable, vinyl-coated nylon Weight, ounce per square yard 18 0.22 Grab tensile strength, pounds* 300 500 Depth of curtain ǁ 2 feet-10 feet 2 feet-10 feet Flotation, inches 6 diameter marine quality expanded polystyrene 8 diameter marine quality expanded polystyrene Net buoyancy, pounds per foot 13 20 Top load carrying components Fabric only Fabric plus 5/16 inches galvanized steel cable at least 9,800 pound break strength Ballast ≥0.7 pounds per foot enclosed 1/4 inches galvanized chain ≥1.1 pounds per foot enclosed 5/16 inches galvanized chain Connection between sections Laced grommets Aluminum collar reinforced quick disconnects * Minimum average roll value meeting the requirements of ASTM D4632, Standard Test Method for Grab Breaking Load and Elongation of Geotextiles. ǁ As required by the Contract.
Remove the curtain upon completion of Work. Do not allow resuspension of sediment or loss of trash and oil into the water during the curtain removal.
3887.3SAMPLING AND TESTING
Submit to the Engineer a manufacturer’s Certificate of Compliance for the floatationS ilt curtain and components.
Flotation Silt Curtain in other states
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