A.02.13 - Purchase Description - Cora Island Rock - draft.pdf

Cora Island Solicitation for Construction Material

GENERAL

Stone shall be broken, durable stone, approved by the Contracting Officer, that will not materially disintegrate under action of air and water. The sources from which the Contractor proposes to obtain the stone shall be selected at least 30 calendar days prior to submittal of a prospective quarry. The Contractor shall provide a loading location on the Missouri River within approximately 15 miles of the confluence of the Missouri River and the Mississippi River. Suitable samples of stone shall be obtained in the presence of a Government representative and shall be tested when required by an approved testing laboratory as designated by the Contracting Officer at the Contractor's expense prior to placing stone. No materials shall be used until approval of the designated source is obtained. The approval of a source shall not be construed as approval of all materials from that source, and material from certain areas, strata, or channels within the approved source may be rejected. The acceptability of the stone will be subject to final approval by the Contracting Officer.

QUARRY OPERATIONS

The contractor will be required to self-perform quarrying operations to satisfy quality specifications of the stone. Conduct quarry operations in a manner to produce stone conforming to the requirements specified, this shall involve selective quarrying, handling, processing, blending, and loading as necessary. Control blasting and handling of stone to produce stone of the size ranges and quality specified.

Techniques such as the use of proper hole diameter, hole depth, hole angle, burden and spacing distances, types and distribution of explosives, delay intervals and sequence, removal of muck piles between each shot, and special handling techniques are required as necessary to produce the specified materials. All aspects of blasting operations shall be specifically designed so that the end product is not damaged from the blasting technique and that the stone is suitable for the intended purpose.

Temporary storage of stone materials subsequent to shipment from the quarry and prior to permanent placement in the required work shall be subject to approval of the Contracting Officer. Underwater storage of stone materials is prohibited.

QUALITY

Service records and/or tests will be used to determine the acceptability of the stone. Sources without service records in the past 10 years shall be tested prior to use and in each even numbered year thereafter. Satisfactory service records shall be accepted in odd-numbered years in lieu of testing of stone for physical properties. Stone accepted on a service record alone shall have demonstrated its ability to withstand deterioration under service conditions. A suitable service record will show date last used, identification of ledges to be used, name of previous user, quantities produced since last tested, and results of most recent tests. The source to be utilized shall have been tested within 24 months prior to use under this contract. In the absence of a suitable service record, the stone shall be subjected to any or all of the following quality tests, as determined necessary by the Contracting Officer. Submit quality testing results upon completion. The Contractor shall provide a loading location on the Missouri River within approximately 15 miles of the confluence of the Missouri River and the Mississippi River to limit handling of rock and prevent break down of rock outside the maximum and minimum limits indicated below for Type 1 and Type 2 stone, as well as any further fracturing of rock.

dra ft

Bulk specific gravity saturated surface-dry basis, method ASTM C 127 – not less than 2.40. One determination shall be performed for each selected stone source prior to using stone from each quarry for construction.

Additional determinations shall be performed onsite for every 25,000 tons of stone material placed and/or if it appears the specific gravity of the stone has changed.

Soundness in freezing and thawing method for ledge stone, Method CRD-C 144- 92 loss at 20 cycles - not more than 25 percent for at least 50 percent of the face height to be quarried. Length of a freezing and thawing cycle shall be 24 hours - i.e., 16 hours of freezing, followed by 8 hours of thawing. Samples shall be representative of the full face to be quarried and shall be taken for each bed in excess of 6-inch thickness, except that for zones containing beds of uniform lithologic properties only one sample for each 5 feet of thickness will be required.

Samples shall be numbered (or lettered) in consecutive order from the top to bottom of the quarry face and the top side of each sample shall be so marked. A sketch section shall be prepared of the full quarry face showing bed thickness, color, hardness, type of stone (shale, limestone, etc.) and the location (bed) of each sample. The sketch section shall be considered part of, and shall accompany, the quality testing results submittal requirement.

GRADATION AND FIELD TESTS

Stone shall be reasonably well graded, free from overburden, spoil, shale, and unsuitable material. The quantity of dirt and fines less than ½-inch maximum cross section, accumulated from interledge layers, blasting, handling operations, and/or all other sources, shall not exceed 5 percent by weight.

For Type 1 stone fill, the maximum weight of any piece of stone shall be limited to 3,000 pounds for stone fill dikes, sills, bank heads, stone fill revetment, stone fill in and along pile structures (including stone roots), trench fill for toe trench revetment, trench fill and stone fill for bank heads, hard points, unless otherwise directed by the Contracting Officer.

For Type 2 stone fill, the maximum weight of any piece of stone shall be limited to 3,000 pounds for chute flow control structures or chute closure structures. Occasional pieces slightly larger than the maximum size may be permitted, provided that gradation and voids requirements are maintained.

Quarry operations shall be controlled to produce well graded stone between the maximum and minimum limits indicated below for Type 1 and Type 2 stone.

The Contracting Officer may require changes in quarry operation as necessary to produce the required product.

The stone shall be reasonably well graded between the follow limit for Type 1 and Type 2 stone:

Type Stone Weight, LBS

Perce nt Passi ng

FOR REFERENCE

ONLY

Size in Approx.

Spherical Diameter (in)

Type 1 3000 80-100% 39 1000 60-90% 27 500 30-70% 22 100 0-50% 13 50 0-35% 10 1 0-5% 3

Type 2 3000 70-100% 39 2000 60-90% 34 500 30-70% 22 100 0-50% 13 50 0-35% 10 1 0-5% 3

Not more than 5 percent by weight finer than ½ inch screen. A plot of the gradation curve for Type 1 and Type 2 stone is attached at the end of this section.

Tests to determine the quantity of dirt and fines less than ½-inch maximum cross section and to determine the gradation of the quarried stone material shall be performed by the Contractor, under the supervision of the Contracting Officer, by approved methods. A representative sample consisting of not less than 50 tons shall be tested at the start of quarry operations for each different source of stone material and for each specified gradation as directed by the Contracting Officer. The Contractor shall provide an acceptable stockpile of 50 tons of stone that meets the specified gradation to serve as a visual aid for production at the quarry and/or the dock barge at the discretion of the Contracting Officer.

A minimum of one gradation test shall be performed for each batch of 50,000 tons or less of stone purchased. The Contractor shall notify the Contracting Officer not less than 3 workdays in advance of each test. In the event of unavailability of the Government representative, the Contractor may perform the tests and certify to the Contracting Officer that the stone complies with the specifications. The Contractor shall plot the results of each test for gradation in relation to the gradation limits envelope specified. The plots shall be made on Engineering Form 4794, furnished by the Contracting Officer, or on a similar form. Results of the field test and the plot shall be furnished to the Contracting Officer prior to placement of the stone. Failure of the test on the initial sample and on any additional samples will be considered cause for rejection of the quarry and/or quarry process, and all stone represented by the failed tests shall be set aside and not incorporated into the work, unless the contractor provides a solution to the contracting officer, and it is then approved by the Contracting Officer.

Any additional test required because of the failure of an initial test sample will not be considered as one of the required tests. Test results must be received by the Government representative before the stone is used in the work. Additional tests may be required by the Government during any 50,000 ton or less production run of stone. Additional tests of the same production run may be required by the Government and shall be at the contractor's expense. The gradation tests shall not exceed 3 tests from each 50,000-ton production run, and at the discretion of the Contraction Officer, be taken from either the quarry or from a loaded barge. The contractor may test to prove suitability of visually rejected material at the Contractor's expense, and in addition to the tests specified above.

MEASUREMENTS

Materials shall be measured at such times and places as approved by the Contracting Officer.

Stone shall be measured for payment by one of the following methods at the option of the Contractor, and weights or computations converted to short tons.

Public Scales

Stone delivered at the site of the work can be weighed on public scales or privately owned scales generally used by the public which have been certified by the State in which the scales are located, and which have been approved by the Contracting Officer. If public scales are not available, the Contractor can furnish approved scales, subject to certification acceptable to the Contracting Officer, with the weighing service to be supplied by an independent professional organization approved by the Contracting Officer.

The Contractor shall furnish the Government inspector a legible copy of each weigh bill, when self-printing scales are used, or a legible copy of the weigh bill signed by the weighmaster as each load is delivered to the jobsite. All cost for weighing the stone on a public or quasi-public scale shall be borne by the Contractor.

Barge Displacement

Stone delivered to the site of the work can be measured for payment by barge displacement. The Contractor shall furnish the Contracting Officer a current barge displacement table not less than 10 days prior to using a barge. The table shall be certified accurate by a person or firm, other than the Contractor accustomed to performing this service and approved by the Contracting Officer. Barge tables furnished shall contain, in parallel columns, the draft of the barge in feet and hundredths from zero to the full depth of the barge, and corresponding gross displacement to the nearest 100th of a ton. Tables submitted shall show the name or number of the barge, the barge dimensions, the barge owner, the name of the manufacturer, the date of preparation of the table, and the certification of the person or firm preparing the table. The Contractor shall furnish, with the barge displacement table, a drawing or sketch of each barge, dimensioned in sufficient detail to permit verification of the values shown in the tables.

The drawing shall show, as a minimum, the weight, length, width, and depth of the barge and dimensions of rake or rakes, including radius, origin of radius, and headlong dimensions. Upon request by the Contractor, and after completion of the contract, the Contracting Officer will return all required barge displacement tables, drawings, or sketches to the Contractor. Each barge on which stone is furnished shall be suitably marked with paint of a contrasting color at each of the displacement gauging points along each side of the barge. The marks shall be perpendicular to the edge of the barge, 4 inches wide and 1 foot in length, painted on both the deck and side. The marks shall be located on each corner of the barge near the lower end of the rake and three additional marks equally spaced amidships. The barge name or number shall be affixed to the deck and sides of the barge, both fore and aft, and shall be of sufficient size and legibility so as to be plainly seen and read. Barge displacement measurements will be recorded at the fore and aft, port and starboard side of each barge by the Contractor to the nearest

0.01 foot and verified by the Contracting Officer representative. All costs for measuring barges, except the cost verification by the Contracting Officer representative, shall be borne by the Contractor.5

Trucks shall be weighed to the nearest 200 pounds and the accumulative net weight reduced to the nearest 20th of a ton. Trucks shall be tared at least twice a day. Barge displacement shall be measured to the nearest 100th of a foot and the net weight computed to the nearest 100th of a ton. Barges shall be measured before and after each loading.

CONTRACT MATERIAL QUANTITIES AND DELIVERY

Delivered by Barge:

Type 1 Rock = 11,865 tons

Type 2 Rock: = 88,970 tons

The material shall be loaded by the Contractor onto Government owned barges and by a Government owned loading dock at a location suitable for loading barges. The Contractor shall provide all other loading equipment, and a loading location on the Missouri River within approximately 15 miles of the confluence of the Missouri River and the Mississippi River. Rear dumping trucks are acceptable for rock delivery. No side dumping trailers permitted. A minimum delivery rate shall be 2,000 tons per day, Monday through Friday. Actual start of delivery shall be coordinated with the Missouri River Area Office. Estimated start time will be approximately 2 weeks after the Award of the contract. All rock shall be loaded onto government owned barges by December 1, 2025.

Delivered by Truck:

Type 2 Rock = 20,000 tons

Road Rock = 3,500 tons

3” Clean Rock = 3,000 tons

Shot Rock = 3,000 tons

The “Delivered by Truck” quantities shall be delivered by truck to the site specified by the Missouri River Area Office. See attached maps of the delivery site. Rear dump trucks are acceptable. No side dump trucks are permitted. The deliveries rate for each material type shall be coordinated with the Missouri River Area Office.

Type 1 Gradation No more than 5% by weight finer than 1/2” screen

Type 2 Gradation No more than 5% by weight finer than 1/2” screen

Cora Island Material Delivery Site

• Cora Island Material Delivery Site

• Cora Island Material Delivery Site