Number: 9123816
Country: United States
Source: Federal Business Opportunities
Riprap material shall be durable quarried stone of suitable quality to ensure permanence in the Upper Mississippi River environment. Stone shall be free from cracks, seams and other defects that would unduly increase its deterioration from natural causes. A crack is considered to be detrimental if it is more than four (4) mils wide and is continuous for one-third the dimension of at least two sides of the stone.
Specific Gravity. All Stone shall have a specific gravity of not less than 2.55 and not more than 2.75.
Riprap Shape. Neither the breadth nor thickness of any individual stone shall be less than one-third its length.
The Contracting Officer will notify the Contractor 15 calendar days in advance of when delivery is to commence by issuing a Delivery Order to the Contractor. The Delivery Order will state the quantity of rock to be delivered. The Contractor shall provide the riprap gradation submittals for approval no later than 7 calendar days prior to delivery of materials to the specified delivery location. It is anticipated that commencement of delivery will occur between the dates of 4 September and 1 December 2018. Delivery shall commence no later than 15 calendar days following issuance of the Delivery Order and shall continue on consecutive work days (Monday through Thursday) until completed, unless directed otherwise by the Contracting Officer.
Delivery of riprap by the Contractor shall include placing material directly from the delivery trucks into a stockpile area on site and/or loading directly from the delivery trucks onto U.S. Government-owned barges. Each barge on which riprap material is to be loaded will have a capacity of 200 tons, with a 20 foot by 85 foot holding area with 2.5 foot high side barriers, with ramps that can be used to drive the delivery trucks directly onto the barges. The barges and access ramps will be maneuvered by Government Personnel. Government personnel and equipment will stockpile material. The Contractor shall provide all other equipment and personnel needed to place the riprap directly onto the barges, except that no secondary loading or repositioning of riprap will be required after the riprap has been dumped from the delivery trucks. The Contracting Officer will direct the Contractor where to unload riprap.
Loading Riprap. Delivery trucks used by the Contractor for loading riprap onto barges or stockpiles shall be straight tandem dump trucks with maximum 18 ton capacity; use of articulated end-dump trailers, side dump, or belly dump trailers will not be allowed.
Delivery Rate. The riprap material delivery rate will vary between 100 tons and 800 tons per day, as requested by the Contracting Officer"s Representative. The Contractor shall be required to increase or decrease the delivery rate within the above stated delivery rate range on a daily basis until the required quantity of material is met.
