170.1 General Description
This work includes controlling water pollution where embankment construction or material removal may cause stream pollution. Requirements of Sections 161, 162, and 163 apply to this Item. However, payment will not be made for erosion control items in those sections used with this work.
170.1.01 Definitions
General Provisions 101 through 150.
170.1.02 Related References
A. Standard Specifications Section 161—Control of Soil Erosion and Sedimentation Section 162—Erosion Control Check Dams Section 163—Miscellaneous Erosion Control Items Section 171—Temporary Silt Fence B. Referenced Documents General Provisions 101 through 150.
170.1.03 Submittals
General Provisions 101 through 150.
170.2 Materials
Use suitable permeable or impermeable materials. These materials include canvas duck, clear or black polyethylene film, or fabric that meets the requirements of Type C, temporary silt fence, found in Section 171. Alternate solutions and materials may be used if Engineer approves. Use barriers long enough and wide enough to control turbidity.
170.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
170.3 Construction Requirements
170.3.01 Personnel
General Provisions 101 through 150.
170.3.02 Equipment
General Provisions 101 through 150.
170.3.03 Preparation
General Provisions 101 through 150.
170.3.04 Fabrication
General Provisions 101 through 150.
170.3.05 Construction
Install a silt retention barrier as follows: Barriers shall be either staked or floating depending upon current, tides, water depth, and other variables, or as shown in the plans and contract. A. Floating Silt Retention Barrier Confine dredged materials to ponding areas or settlement basins using standpipes or weirs. Place the barrier approximately 25 ft. (7.5 m) outside the affected construction area, and at a depth within 5 ft. ( 1.5 m) of the bottom. If the body of water has a significant current, place the barrier parallel to the water flow. Vary the dimensions and methods to suit the conditions and to meet the requirements of other local and State water control agencies to ensure that silt dispersion is effectively controlled. Provide a fabric that is weighted to prevent the bottom from floating. B. Staked Silt Retention Barrier 1. Where a staked barrier is used to protect a stream or inundated area, ensure the fabric: a. Extends to the bottom of the stream or inundated area and is weighted to prevent it from floating b. Is not trenched in at the bottom c. Extends 1 ft. (300 mm) above normal water 2. Posts: Options: Either 2 in. (50 mm) x 4 in. (100 mm) wood, 2 ½ in. (62.5 mm min. diameter) wood, or steel at a mi nimum of 1.33 pounds per ft. (1.980 kg/m) a. space posts at a maximum spacing of 4 ft. (1.2 m) b. posts are minimum of 5 ft. (1.5 m) in length c. posts extend a minimum of 18 in. (450 mm) into the soil
170.3.06 Quality Acceptance
General Provisions 101 through 150.
170.3.07 Contractor Warranty and Maintenance
General Provisions 101 through 150.
170.4 Measurement
Silt retention barriers, either floating or staked, are measured by the linear foot (meter) of barrier required to prevent siltation and pollution.
170.4.01 Limits
General Provisions 101 through 150.
170.5 Payment
The applicable requirements of Sections 161, 162, and 163 apply to this Item, except that the erosion control items contained in those sections will not be paid for when used in conjunction with this work. Silt retention barriers will be paid for at the Contract Unit Price for each barrier, complete in place and accepted. Payment is full compensation for furnishing materials, erecting the barrier, removing, and disposing of the barrier when no longer required. Payment will be made under: Item No. 170 Floating silt retention barrier Per linear foot (meter) Item No. 170 Staked silt retention barrier Per linear foot (meter)
170.5.01 Adjustments
General Provisions 101 through 150.
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