182 SECTION 262
262.01 Description
This work consists of furnishing, installing, maintaining, and removing flotation silt curtain.
262.02 Equipment
Reserved.
262.03 Materials
Material Property Requirement Curtain Fabric Impermeable vinyl -coated nylon Grab Tensile Strength 500 lb Floatation 8 inch diameter Marine quality expanded polystyrene Net Buoyancy per Foot 20 lb Top Load Carrying Components Fabric plus 5∕16 inch galvanized steel cable 9,800 lb min break strength Ballast (min) 5∕16 inch galvanized chain Connections Between Sections Aluminum collar reinforced quick disconnects
262.04 Construction Requirements
A.Installation. Attach anchor lines to the flotation device.
1.Still Water. Secure both ends of the curtain on land using the anchor points. Use anchor buoys if bottom anchors are used. Tow out the curtain in the furled condition and attach to the anchor points. Set additional anchor points as necessary and attach them firmly to the curtain to maintain the desired location of the curtain. Release the furling lines to let the curtain skirt drop.
2.Moving Water. Set all anchor points. Ensure the anchor points keep the curtain in the desired location. Use anchor buoys on all anchor points. Start securing the furled curtain to the anchor points on the upstream side and work downstream. Make any necessary adjustments. 183 Release the furling lines to let the curtain skirt drop. Do not install the curtain across the entire width of a flowing channel.
B.Maintenance. Discontinue work if the silt curtain sinks below the surface or detaches from the anchor points or buoys. Repair or replace the silt curtain before continuing work. Remove silt curtain before the water freezes for winter. Replace silt curtain in the spring once ice is out.
C.Removal. Place bank protection before removing the silt curtain. If bank prot ection is not specified, complete final grading of the adjacent slopes and install sediment control devices at the toe of the slope before removing the silt curtain.
262.05 Method of Measurement
The Engineer will measure as specified in Section 109.01, “M easurement of Quantities”.
262.06 Basis of Payment
Pay Item Pay Unit Flotation Silt Curtain Linear Foot Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 265 184 SECTION 265 STABILIZED CONSTRUCTION ACCESS
265.01 Description
This work consists of installing, maintaining, and removing a stabilized construction access where equipment enters a public roadway.
265.02 Equipment
Reserved.
265.03 M Aterials
A.Aggregate. Provide aggregate that has 90 percent fractured faces and meets the following gradation: Sieve Size Percent Passing 4 Inch 100 2 Inch 0
B.Geosynthetic Fabric. Material Section R1 Fabric 858
265.04 Construction Requirements
A.General. Remove topsoil before construction of stabilized construction access. If the access restricts water flow, provide temporary drainage through the stabilized construction access.
B.Maintenance. Maintain the stabilized construction access so that it retains its effectiveness. Add material as specified in Section 265.03 A, “Aggregate” as needed.
C.Removal. After removal, restore the disturbed area to its original condition. Perform topsoil work as specified in Section 203.04 B, “Topsoil” . Place the type of seed specified in the plans. If no seed is specified use Class II seed mixture. Place seed mixture as specified in Section 251.02, “Equipment” ; 251.03, “Materials” ; and 251.04, “Construction Requirements” . Place mulch as specified in Section 253.02, “Equipment” ; 253.03, “Materials” ; and 253.04, “Construction Requirements” .
265.05 Method of Measurement
The Engineer will measure as specified in Section 109.01, “Measurement of Quantities”.
Referenced in this section
Sections that cite this one
FLOTATION SILT CURTAIN in other states
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 217–218 of 550. View official source ↗