8-51 Section 876
876-1 Description
Supply and p lace rip rap and, if necessary, filtration geotextiles i n accordance with the contract and as directed by the Engineer .
876-2 Materials
Refer to Division 10. Item Section Geotextile for Drainage, Type 2 1056 Plain Rip Rap 1042 Provide Type 2 geotextile for filtration geotextiles and plain rip rap classes in accordance with the contract .
876-3 Plain Rip Rap
Grade locations for rip rap as shown in the plan s. Use filtration geotextiles under rip rap when shown in the plan s and as directed by the Engineer . Do not leave geotextiles exposed for more than 7 days before covering with rip rap. Place filtration geotextiles on surfaces free of obstructions, debris and soft pockets. Overlap adjacent geotextiles at least 18 inches in the downhill and downstream direction to prevent flow from lifting the edge of the top geotextile. Pull filtration geotextiles taut so they are in tension and free of kinks, folds, wrinkles or creases. Hold geotextiles in place as needed with wire staples or anchor pins . Do not displace or damage filtration geotextiles while placing rip rap. Replace any damaged geotextiles to the satisfaction of the Engineer. For rip rap at pipe outlets, place rip rap immediately after installing pipes. When rip rap is required for channel changes and drainage ditches, place rip rap before diverting water into channels and ditches. Place rip rap such that the smaller stones are uniformly distributed throughout rip rap. Install rip rap with mechanical methods and if necessary, by hand to form a well -graded, dense and neat layer of rip rap.
876-4 Measurement and Payment
Rip Rap, Class ____ will be measured and paid in tons . Plain rip rap will be measured by weigh ing rip rap in trucks in accordance with Article 106-7. Geotextile for Drainage will be measured and paid in square yards. Filtration geotextiles will be measured along the ground surface as the square yards of exposed geotextiles before placing rip rap. No measurement will be made for overlapping geotextiles. The contract unit prices for Rip Rap, Class ____ and Geotextile for Drainage will be full compensation for providing, transporting and placing rip rap, filtration geotextiles, wire staples and anchor pins. Payment will be made under: Pay Item Pay Unit Rip Rap, Class ____ Ton Geotextile for Drainage Square Yard