612.1DESCRIPTION—This work is construction of subgrade drains.
612.2MATERIAL—
• Asphalt Impregnated Paper. Section 727
• Coarse Aggregate, Type C or better (no steel slag), No. 57. Section 703.2, except that the soundness test is not required and the percentage of crushed fragments for gravel does not apply.
• Geotextiles, Class 1. Section 735
612.3CONSTRUCTION—As shown on the Standard Drawings and as follows:
Keep outlet ends of subgrade drains open during construction and until final acceptance of shoulders. Extend subgrade drains a length sufficient to adequately drain the wet area. Construct subgrade drains under subbase after the subgrade has been completed but before the subbase is placed. Construct subgrade drains at right angles to the roadway centerline , or skew, as directed. Extend subgrade drains along the roadway, if necessary, to achieve a suitable outlet. Maintain a minimum slope of 1/4 inch per foot on the trench bottom through pavement and shoulder areas.
standards to reconstruct the existing shoulder as specified in the contract documents.
612.4MEASUREMENT AND PAYMENT—
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