Specifications - State of Delaware

SECTION 312500 - EROSION AND SEDIMENTATION CONTROLS: continued
F. Riprap: The stones shall be of durable rock, sized and graded so that at least 50% of the pieces
are larger than the d50 size shown on the Plans. The diameter of the largest stone shall not
exceed 1.5 times the d50 size, nor shall the smallest stone be smaller than one-half the
d50 size. All stone shall meet the requirements of Section 712 of the Delaware Department of
Transportation Standard Specifications. Filter cloth shall be a non-woven geotextile
conforming to ASTM D1777 or ASTM D1682.
PART 3 - EXECUTION
3.01 CONSTRUCTION REQUIREMENTS:
A. Vegetative stabilization shall be used on graded or cleared areas, which are subject to erosion
for a period of 14 days or more.
B. All temporary erosion control measures shall be installed in accordance with the Delaware
Erosion and Sediment Control Handbook.
C. Erosion control matting shall be installed in accordance with the manufacturer's written
instructions, the requirements of the Delaware Erosion and Sediment Control Handbook, and
the details on the Plans.
D. In the event of conflict between these requirements and pollution control laws, rules, or
regulations of other federal or state agencies, the more restrictive laws, rules, or regulations
shall apply.
E. The Contractor shall be responsible for maintaining all soil erosion and sediment control
measures in an acceptable and functional manner. The Contractor shall remove all temporary
measures after all other construction is complete, final restorations installed, and all disturbed
areas have been adequately stabilized.
END OF SECTION 312500
312500-2 DEAN312500.DOC