Section 233 Section 233 precaution to prevent unnecessary foot and vehicular traffic on the mulched areas and shall repair and restore immediately all displacement of mulc h without additional compensation. 233.04--Method of Measurement . Mulch for woody plant materials will be measured by the cubic yard or ton as specified herein. Tree Bark Mulch, Type III for tree plant holes and for shrub plant holes outside of plant pit areas will be measured per cubic yard. Tree Bark Mulch, Type V for tree and shrub plant holes outside of plant pit areas requiring bed preparation and in unplanted ar eas where the mulch is utilized as a surface treatment will be measured per cubic yard;. Tree Bark Mulch, Type V within plant pit areas will not be measured for payment. Tree bark mulch will be measured by the cubic yard as packaged or baled. Unless the Engineer determines otherwise, the volume shown on the manufacturer's label or tag will be used to determine the volume. Aggregate mulch will be measured by the cubic yard (LVM). Straw mulch will be measured by the cubic yard, ton, or each bale. When measuring straw mulch by the cubic yard, the volume for measurement will be the product of the number of bales of straw mulch acceptably placed and the average volume per bale. When measuring straw mulch by the ton, the weight for measurement will be the product of the number of bales of straw mulch accepta bly placed and the average weight per bale as determined on approved scal es provided by the Contractor.
233.05 Basis of Payment . Mulch of the kinds, types, or classes specified will be paid
for at the contract unit price per cubic yard for tree bark mulch, per cubic yard (LVM) for aggregate mulch, and per cubic yard, ton or each for straw mulch, which prices thus paid shall be full compensation for completing the work. Payment will be made under: 233-A: Tree Bark Mulch, Type - per cubic yard 233-B: Aggregate Mulch - per cubic yard 233-C: Straw Mulch, Class - per cubic yard, ton, or each 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. Exce ssive 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 cro ss 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 loca tions 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 compensation for co mpleting the work. Inlet siltation guard, resetting inlet siltation guards, and turbidity barrier, measured as prescribed above, will be paid for at the co ntract unit price per each or linear foot, which shall be full compensation for furnishing, constructing, and maintaining the work and for the removal and disposal of all items comprising the devices. Payment will be made under: 234-A: Temporary Silt Fence - per linear foot 234-B: Permanent Silt Fence - per linear foot 234-C: Super Silt Fence - per linear foot 234-D: Inlet Siltation Guard - per each 234-E: Reset Inlet Siltation Guard - per each 234-F: Turbidity Barrier - per linear foot SECTION 235 - TEMPORARY EROSION CHECK
235.01 Description . This work consists of furnishing, constructing and maintaining
baled hay or straw erosion checks for the rete ntion of soil along the toe of fill slopes, around inlets, swale areas, small ditches, sediment basins and other areas as directed by the Engineer in accordance with the requirements sh own on the plans and these specifications. Also, the work includes removing and disposing of the erosion checks and silt accumulations as directed by the Engineer. Measurement and payment for temporary erosion checks will be made only when ordered and a pay item is included in the bid schedule of the proposal. The quantity is estimated for bidding purposes only and will be dependent upon actual conditions that occur during construction of the project.
235.02 Materials . Approved Type I or II baled hay or straw material shall be
rectangular in shape with a minimum length of 32 inches and shall m eet the requirements of Subsection 715.05. The wooden stakes us ed in securing the baled material in place shall be approximately 2 inches by 2 inches x 34 inches meeting the approval of the Engineer.
235.03 Construction Requirements .
235.03.1 General. The erosion checks shall be constructed at the locations and
according to the requirements shown on the plans or as directed by th e Engineer. Erosion checks required along the toe of fill slopes shall be constructed prior to grading operations at the site. For other locations, the erosion checks shall be constructed when directed by the Engineer. The soil shall be excavated at least three inches in depth to embed the baled material.
Source: Mississippi Standard Specifications for Road and Bridge Construction, 2017 Edition. Pages 195–197 of 1,113.