A.
Concrete Riprap.
Concrete shall be Class B unless otherwise shown on the plans. Wire reinforcement used in Concrete Riprap shall consist of welded wire fabric meeting the requirements of ASTM A185.
B.
Stone Riprap.
Unless otherwise shown on the plans, stone for riprap shall meet the following requirements:
1.
Riprap stone shall be a durable, natural stone and have a minimum bulk specific gravity of 2.40.
2.
Stones shall not be less than 0.33 cubic feet in volume and not less than four (4) inches in their least dimension. The width of the stone shall not be less than twice its thickness. The material may consist of broken up concrete removed under the contract or obtained from other approved sources.
3.
A verification test for the size and type of finished riprap stone shall be performed by the Contractor with the Engineer or the designated representative of the Engineer present. The stone shall be stockpiled at the construction site and the Contractor shall give the Engineer or the designated representative of the Engineer 24 hours’ notice of the verification test.
C.
Grout.
Grout shall consist of one (1) part Portland cement, two (2) parts finely graded sand, and sufficient water to provide the desired consistency. Grout shall have a consistency such that the grout will flow into and completely fill all voids. Water in grout shall be from a potable water source that meets the approval of the Engineer or designated representative of the Engineer.
(Ordinance 2007-106, App. B, adopted 3/20/07)