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The work covered by this section consists of the construction, maintenance, and removal of low level rock structures placed in streams below culvert construction sites to trap sediment.
The quantity of temporary rock silt screens to be constructed will be affected by the actual conditions which occur during the construction of the project. The quantity of silt screens may be increased, decreased, or eliminated entirely at the direction of the Engineer. Such variations in quantity will not be considered as alterations in the details of construction or a change in the character of the work.
All materials shall meet the requirements of Division 10 shown below:
Stone for erosion control, class ____ Article 1042-1
Sediment control stone Section 1005
Temporary rock silt screen devices shall be constructed as shown on the plans. The temporary rock silt screens shall be constructed at the locations shown on the plans and at other locations directed by the Engineer.
The structural stone shall be placed in the stream below the culvert site with approximately 2:1 side slopes, and shall be faced on the upstream side with sediment control stone approximately 12 inches thick.
The dam structure shall have a 1.5 foot minimum height and a 3 foot maximum height and shall not be higher than 1 foot above normal flow of the stream.
1636-4 MAINTENANCE AND REMOVAL.
The Contractor shall maintain the temporary rock silt screens, and shall remove and dispose of silt accumulations at the silt screens when so directed by the Engineer in accordance with Section 1630.
Unless otherwise directed by the Engineer, temporary rock silt screens shall be removed as the project nears completion, or at such time the Engineer deems the device to be no longer useful. The actual time of removal shall be as directed by the Engineer. The Contractor shall remove the trapped sediment from the temporary rock silt screen prior to removing the device.
Temporary rock silt screens will not be measured for payment under this article.
Payment for temporary rock silt screens will be as follows:
The quantity of structural stone measured as provided in Article 16104 will be made at the contract unit price per ton for "Stone for Erosion Control, Class ____" as provided in Article 1610.
The quantity of sediment control stone measured as provided in Article 16104 will be made at the contract unit price per ton for "Sediment Control Stone" as provided in Article 16105.
The removal and disposal of silt accumulations will be paid for
as provided in Section 1630.