SECTION 234 - SILT FENCE
234.01 Description. This work consists of furnishing, constructing and maintaining a
water permeable filter type fence, inlet siltation guard or turbidity barrier for the purpose of removing suspended soil particles from the water passing through it in accordance with the requirements shown on the plans, as directed by the Engineer and these specifications. Fence, inlet siltation guards and turbidity barriers measured and paid as temporary shall be removed when no longer needed or permanent devices are installed. It is understood that measurement and payment for silt fence, inlet siltation guards, and turbidity barriers will be made when a pay item is included in the proposal. The quantities are estimated for bidding purposes only, and may be varied dependent upon actual conditions that occur during construction of the project.
234.02 Materials. Geotextile fabric, posts, staples and woven wire backing, when
required, shall meet the requirements of Subsection 714.13. Inlet siltation guards shall be one from the Department’s APL. Turbidity barriers shall be one from the Department’s APL. Chain link fence and hardware for super silt fence shall meet the requirements of Section 607, as applicable. Geotextile for super silt fence shall meet the requirements of Subsection 714.13 for a Type II Woven fabric.
234.03 Construction Requirements.
234.03.1 Placement of Fence.
234.03.1 1--Silt Fence. The silt fences shall be constructed at the locations shown on the
plans or as directed by the Engineer. All posts shall be installed so that no more than three feet of the post shall protrude above the ground. Extra post for bracing shall be installed as directed by the Engineer. The woven wire shall be securely fastened to the wood posts with staples. When metal posts are used, the wire shall be fastened to the pos t with wire or other approved means. The geotextile shall be attached to the wire fence by wire or other approved means. The bottom edge of the geotextile shall be buried six inches below ground surface to prevent undermining. When splicing of the geotextile is necessary, two posts shall be installed approximately 18 inches apart and each piece of geotextile shall be fastened to both posts. The geotextile will be rejected if it has defects, rips, holes, flaws, deterioration, or damage incurred during manufacture, transportation, storage or installation. Type II geotextile may be installed without th e woven wire fence backing provided all of the following conditions are met:
a.Post spacing is reduced to six feet or less.
b.The geotextile has been approved by the Engineer and the manufacturer recommends its use without the woven wire backing.
c.Fence posts shall be inclined toward the runoff source at an angle of not more than 20° from vertical.
d.Geotextile shall be attached to the posts in such manner that purpose intended is satisfied and maintained.
234.03.1 2--Super Silt Fence. Super silt fence shall be constructed in accordance with
the plans and these specifications. All posts shall be installed/driven so that at least 34 inches of the post will protrude above the ground. The chain link wire and geotextile shall be stretched taut and securely fastened to the posts as shown on the plans. The bottom edge of the fence and geotextile shall be buried at least eight inches below ground surface to prevent undermining. When splicing of the geotextile is necessary, the fa bric shall be overlapped approximately 18 inches.
234.03.2 Placement of Inlet Siltation Guards and Turbidity Barriers. T h e i n l e t
siltation guards and turbidity barriers shall be constructed at the locations shown on the erosion control plan. Inlet siltation guards and turbidity barriers shall be installed in accordance with the erosion control drawings in the plans. A copy of the manufacturer’s instructions for placement of inlet siltation guards and turbidity barriers shall be provided to the Engineer prior to construction.
234.03.3 Maintenance and Removal. The Contractor shall maintain the silt fence and
the geotextile shall be removed and replaced wh en deteriorated to such extent that it reduces the effectiveness of the silt fence. Excessive accumulations against the fence shall be removed and disposed of as directed by the Engineer. The Contractor shall maintain the inlet siltation guards. The geotextile shall be removed and replaced when deteriorated to such exte nt that it reduces the effectiveness of the guard. Replacement geotextile shall be the same type and manufacture as the original. Excessive accumulations against the guard shall be removed and disposed of at a location approved by the Engineer. The Contractor shall maintain the turbidity barriers. Excessive accumulations against the turbidity barrier shall be removed and disposed of at a location approved by the Engineer. Unless otherwise directed, all temporary silt fences, inlet guards and turbidity barriers shall be removed. Upon removal, the Contractor shall remove and dispose of any excess silt accumulations, shape the area to the line, grade, and cross section shown on the plans and place vegetation on all bare areas in accord ance with the contract requirements. The temporary fence, inlet guard materials and turb idity barriers will remain the property of the Contractor and may be used at other locations provided the materials are acceptable to the Engineer.
234.03.4 Resetting Inlet Siltation Guards and Turbidity Barriers. When inlet
siltation guards and turbidity barriers are no longer needed at one location, they may be removed and reset at other needed locations. The Engineer may allow the resetting of siltation guards and turbidity barriers upon an inspection and determination that the siltation guards (frame and geotextile) and turbidity barriers are adequate for their intended purpose. When they have to be stored until needed at another location, payment for resetting will not be made until they are reset at their needed location.
234.04 Method of Measurement . Silt fence and super silt fence will be measured by
the linear foot. Inlet siltation guard and resetting siltation gua rds will be measured per each. Turbidity barrier will be measured per linear foot.
234.05 Basis of Payment . Silt fence and super silt fence, measured as prescribed
above, will be paid for at the contract unit price per linear foot which shall be full
Referenced in this section
Silt Fence in other states
Get an email when 234 changes
Mississippi revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.
Source: Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 195–197 of 1,113. View official source ↗