2−44 207.02 MATERIALS.
207.02.1 Baled Hay Ditch and Swale Erosion Checks. Baled hay or straw shall be baled within
twelve months of use. Bindings shall be sufficiently strong to act as handles when placing bales in position by hand. The minimum dimension of any bale shall be 18 inches. Wood stakes shall be oak, 1-inch by 1-inch in section, and at least 3 feet in length. 207.02.2 Log and Hay Check Dams. Baled hay or straw shall conform to the requirements of Subsection 207.02.1 , above. Wire spikes shall be of a quality acceptable to the Engineer. Crushed stone shall meet the requirements of Subsection M.01.09; Table I, Column II of these Specifications. Other natural materials such as rocks and cut logs shall both conform to the dimensions and sizes indicated on the Plans and be acceptable to the Engineer. 207.02.3 Sand Bag Erosion Dikes. The sand bags and the sand material shall be of a quality acceptable to the Engineer. Dumped stone, when required, shall meet the requirements of Subsection M.10.03.2 for Modified NSA Class R-4 riprap. The filled sand bags will weigh a minimum of 60 pounds. 207.02.4 Stone Check Dams. The stone shall meet the requirements of Subsection M.01.09, Table I, Column V for Filter Stone.
207.02.05 Compost Filter Sock Ditch and Swale Erosion Checks. Compost filter sock material
shall be in accordance with AASHTO Designation: MP 9-06 (2007 or latest revision). Compost filter material shall be in accordance with AASHTO Designation: MP 9-06 (2007 or latest revision). Compost material shall also meet all applicable Federal and State Regulations. For compost filter socks 18 inches or less in diameter, wooden stakes shall be 1 inch by 1 inch, and of a length that shall project into the soil 1 foot leaving 3 inches to 4 inches protruding above the filter sock. For compost filter socks greater than 18 inches in diameter wooden stakes shall be 2 inch by 2 inch and of a length that shall project into the soil 1 foot leaving 3 inches to 4 inches protruding above the filter sock. Stakes shall be placed at the ends and at 5 foot intervals, on center.
207.03 CONSTRUCTION METHODS. Those erosion and pollution controls indicated on the
Plans shall be installed and approved by the Engi neer before the commencement of any drainage, roadway or bridge construction.
207.03.1 Baled Hay Ditch and Swale Erosion Checks.
a.Installation. Erosion checks shall consist of two or more bales placed and staked perpendicular to the flow line of a ditch formed by the intersection of its slopes and constructed as indicated on the Plans. The following stipulations also apply:
1.A pair of erosion checks shall be placed a minimum of 12 feet apart at each location.
2.The ditch erosion checks shall be entrenched and backfilled. The trench shall be excavated the width of the bale(s) and the length of the check to a minimum depth of 3 inches. After the bales are staked and chinked, the excavated soil shall be backfilled against the check. Backfill shall conform to the ground level on the downhill side and shall be built up to 4 inches against the uphill side.
3.The bales are to be installed so that the bindings are oriented around the sides of the 2−45bales rather than their tops and bottoms.
4.The edges of overlapped bales shall overlap in such a manner that there will be no opening between the bales. Where bales butt together the gap between bales shall be chinked with loose straw to prevent water from escaping.
5.Each bale shall be securely anchored by a least two stakes driven through the bale. The first stake in each bale should be driven toward the previously laid bale to force the bales together.
6.All earth ditch areas are required to have the protection of baled hay ditch erosion checks prior to their outfall onto existing ground, or natural or man-made water courses.
7.The haybale barrier shall be extended such a length that the bottoms of the end bales are higher in elevation than the top of the lowest middle bale. This configuration will insure that the sediment laden runoff will flow either through or over the barrier, but not around it.
b.Removal. Bales of hay used in this work will not normally be left to rot in place. The bales may be removed only when the adjacent exposed area is stabilized, i.e., the area has an established grass or stone cover or has been paved, and is free from future uncontrolled discharges. Prior to such removal, however, all silt, mud, and debris entrapped by the respective erosion checks shall be removed and the area cleaned up in accordance with the applicable provisions of SECTION 212 of these Specifications. Immediately upon removal of the bales, the remaining exposed areas (under the bales) will be backfilled, raked, and graded as necessary to match the surrounding grade and then seeded. 207.03.2 Log and Hay Check Dams.
a.Installation. Log and hay check dams will be constructed perpendicular to the stream flow line. The bales of hay shall be placed between 18-inch log walls, nailed, braced and weighted with stone as indicated on the Plans.
b.Removal. Log and hay check dams will be removed prior to the completion of the project at a time designated by the Engineer. Prior to such removal, however, all silt, mud, and debris entrapped by the check dam shall be removed and the area cleaned up in accordance with the applicable provisions of SECTION 212 of these Specifications. Immediately upon removal of the check dams, the exposed and disturbed areas will be backfilled, raked, and graded as necessary to match the surrounding area and then seeded. 207.03.3 Sand Bag Erosion Dikes.
a.Installation. Sand bag erosion dikes shall be constructed as indicated on the Plans. The sand bags will be placed a minimum of four layers high. Over the center of the ditch the top layer of sand bags will have a weir opening equal to one half the bottom ditch width. The sand bags shall be extended such a length that the bottom of the end sand bags are higher in elevation than the top of the lowest middle sand bag. When the sand bag dike is constructed across an earth ditch, the down stream side of the dike at the weir opening is to be protected with Modified NSA Class R-4 dumped riprap.
b.Removal. Sand bag erosion dikes will be removed prior to the completion of the project 2−46 at a time designated by the Engineer. Prior to such removal, however, all silt, mud, and debris entrapped by the erosion dike shall be removed and the area cleaned up in accordance with the applicable provisions of SECTION 212 of these Specifications.
207.03.4 Stone Check Dams.
a.Installation. Stone check dams shall be constructed as indicated in on the Plans. The stone shall be placed across the ditch or swale to achieve complete coverage and shaped to the required configuration by the use of hand tools. The stone shall be sloped from the sides of the ditch/swale towards the center such that the center is 6 inches lower than the stone at the sides of the ditch/swale. The check dam shall have 2-horizontal to 1-vertical side slopes and shall not exceed 2 feet in height.
b.Removal. Stone check dams will be removed prior to the completion of the project at a time designated by the Engineer. Prior to such removal, however, all silt, mud and debris entrapped by the check dam shall be removed and the area cleaned up in accordance with the applicable provisions of SECTION 212 of these Specifications.
207.03.5 Compost Filter Sock Ditch and Swale Erosion Checks.
a.Installation. Compost Filter sock ditch and swale erosion checks shall be constructed at the locations, and in accordance with the details indicated on the plans, or as directed by the Engineer. The following stipulations also apply:
1.Compost filter sock ditch and swale erosion checks may be either fabricated on site or delivered to the site.
2.Trenching is not required. Compost filter sock ditch and swale erosion checks shall be placed over the top of ground, wooden stakes shall be driven through the center of the filter socks to anchor them to the ground. To ensure optimum performance, heavy vegetation shall be cut down or removed, and extremely uneven surfaces should be graded to ensure that the compost filter sock uniformly contacts the ground surface. These may be placed over the top of rolled erosion controls mats or turf re-enforcement mats. These may also be stacked if additional height is needed. 3. Compost filter sock ditch and swale erosion checks shall be installed perpendicular to flow. This erosion check shall extend to such a length that the bottoms of each end are higher in elevation than the lowest middle part or the top of the banks (maximum flow line) are reached.
b.Remova l. This work, if required, shall include the removal of the compost filter sock and stakes. Unless biodegradable, the mesh filter sock material shall be cut open and the mesh removed. In general, the compost filter material may be left in place, however the material shall be raked out leveled to surrounding grades, then seeded. Prior to such removal, however, all silt, mud and debris entrapped by the compost filter sock shall be removed and the area cleaned up in accordance with the applicable provisions of SECTION 212 of these Specifications. Immediately upon removal of the compost filter socks the remaining exposed areas will be finished as specified in Para. b of Subsection 206.03.1 .
207.04 METHOD OF MEASUREMENT. 207.04.1 Baled Hay Ditch and Swale Erosion Checks. "Baled Hay Ditch and Swale Erosion
Checks" will be measured by the number of linear feet of hay bales actually installed in accordance 2−47with the Plans and/or as directed by the Engineer.
207.04.2 Log and Hay Check Dams. "Log and Hay Check Dams" will be measured by the
number of linear feet actually installed in accordance with the Plans and/or as directed by the Engineer. 207.04.3 Sand Bag Erosion Checks. "Sand Bag Erosion Checks" will be measured by the number of sand bags actually provided in accordance with the Plans and/or as directed by the Engineer.
207.04.4 Stone Check Dams. "Stone Check Dams" will be measured by the number of cubic feet
of stone actually placed in accordance with the Plans and/or as directed by the Engineer.
207.04.5 Compost Filter Sock Ditch and Swale Erosion Checks. “ Compost Filter Sock Ditch
and Swale Erosion Checks” of the various sizes as indicated on the plans will be measured by the number of linear feet of continuous runs of such co mpost filter sock actually installed in accordance with the Plans and/or as directed by the Engineer.
207.05 Basis of Payment.
207.05.1 Baled Hay Ditch and Swale Erosion Checks. The accepted quantity of "Baled Hay
Ditch and Swale Erosion Checks" will be paid for at the contract unit price per li near foot as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials, and equipment including excavation, hay bales, stakes, the subsequent removal of bales and stakes, backfill, grading, seeding, and all incidentals required to finish the work, complete and accepted by the Engineer. 207.05.2 Log and Hay Check Dams. The accepted quantity of "Log and Hay Check Dams" will be paid for at the contract unit price per linear foot as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials, and equipment including hay bales, logs, nails, crushed stone wedge, ballast st ones, the subsequent removal of the log and hay dam, grading, seeding, and all incidentals required to finish the work, complete and accepted by the Engineer. 207.05.3 Sand Bag Erosion Checks. The accepted quantity of "Sand Bag Erosion Checks" will be paid for at the contract unit price per each bag as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, equipment and materials, including bags, sand, the subsequent removal of sand bags, and all incidentals required to finish the work, complete and accepted by the Engineer. 207.05.4 Stone Check Dams. The accepted quantity of "Stone Check Dams" will be paid for at the contract unit price per cubic foot as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materi als, and equipment, the subsequent removal of the stone, and all incidentals required to finish the work, complete and accepted by the Engineer.
207.05.5 Compost Filter Sock Ditch and Swale Erosion Checks. The accepted quantity of
“Compost Filter Sock Ditch and Swale Erosion Checks” will be paid for at the contract unit prices per linear foot as listed in the Proposal. The price so-stated constitutes full and complete compensation for all labor, materials and equipment, including mesh filter socks, removal of mesh filter socks, compost filter material, stakes, removal of stakes, removal and disposal of entrapped
Source: Rhode Island Standard Specifications (Bluebook), 2024 Edition. Pages 154–157 of 826.