§ 635S.4. Construction Methods

All trees, brush, stumps, obstructions and other objectionable material shall be removed and disposed of in a manner that will not interfere with the excavation and construction of the dike as indicated on the Drawings and Standard Detail No. 635S-1, "Perimeter Dike". The dike shall not drain onto the public right of way.

All perimeter dikes shall be machine compacted to the extent necessary to provide not less than 95 percent density conforming to TxDoT Test Method Tex-114-E and shall have positive drainage to an outlet. Diverted runoff from a protected or stabilized upland area shall flow directly onto an undisturbed stabilized area or into a level spreader (Standard Specification Item No. 634S) or grade stabilization structure (Standard Specification Item No. 625S).

Diverted runoff from a disturbed or exposed upland area shall be conveyed to a sediment-trapping device such as sediment trap, a sediment basin or to an area protected by any of these practices (Environmental Criteria Manual Section 1.4.0). Unless otherwise indicated on the Drawings, stabilization shall conform to Item No. 591S, "Riprap for Slope Protection" and/or Item No. 627S, "Grass-Lined Swale and Grass-Lined Swale with Stone Center". Riprap, when used, shall be placed in a uniform layer embedded in the soil.

The structure shall be inspected monthly and after each rainfall. Repairs shall be made by the Contractor, as needed, throughout the duration of this contract or until the Engineer or designated representative provides written permission to remove the structure.