Attachment B Statement of Work.pdf

DESCRIPTION/SPECIFICATION/STATEMENT OF WORK

For Ottawa National Forest Gravel Crushing

SCOPE OF WORK

The Forest Service (FS) has a requirement for the crushing, stockpiling, and testing of aggregate from designated Government sources throughout the Ottawa National Forest.

The contractor shall provide all labor, materials, equipment, tools, supplies, transportation, and incidentals necessary in accordance with the following terms and specifications.

The Contractor shall utilize products and material made from biobased materials to the maximum extent possible without jeopardizing the intended end use or detracting from the overall quality delivered to the end user. All supplies and materials shall be of a type and quality that conform to applicable Federal specifications and standards. All supplies and materials to be used in the performance of work described herein are subject to the approval of the Contracting Officer Representative (COR).

LOCATION

Work shall be performed in the Pits within the following areas:

Ottawa National Forest in the western upper peninsula of Michigan. Counties include Baraga, Gogebic, Houghton, Iron, and Ontonagon

Government sources will be identified on project location maps.

EQUIPMENT

The Contractor shall furnish sufficient equipment necessary to crush and stockpile crushed aggregate according to the specifications within. All equipment shall be of the proper type, sufficient size, and in such mechanical condition to produce a satisfactory end product. The COR may order the removal and require replacement of any unsatisfactory equipment.

PERSONNEL QUALIFICATIONS

The Contractor shall furnish qualified equipment operators capable of performing in a skillful and professional manner. The COR may require the replacement of any operator considered incompetent, careless, or otherwise objectionable.

METHOD OF OPERATION IN GOVERNMENT PIT

(a) Development - Pit development work shall be in accordance with these specifications and the Pit Development Plan. Pit development shall include maintaining the pit access road, clearing and grubbing, stockpiling of topsoil and oversized rock, disposal of stumps, brush, and unsuitable material.

(b) Pit Access Road - The Contractor shall be responsible for maintaining the pit access roads.

(c) Clearing and Grubbing - In areas requiring removal of timber, trees shall be piled at a location approved by the Contracting Officer Representative. Stumps shall be grubbed as needed prior to the removal of any material for crushing. The Contractor shall pile all resulting stumps and slash in the area indicated on the Pit Development Plan and/or as approved by the Contracting Officer Representative.

(d) Stripping topsoil and minor vegetation that has grown in during inactive periods of the pit use. Grading of pit areas for stockpiles and road access.

(e) Operations

(1) All pit development work shall be completed by the Contractor prior to start of crushing operations. A 10-foot-wide cleared area shall be maintained along the top edge of the pit face.

(2) All available material suitable for crushing, including the floor of the existing pit, shall be utilized in the Contractor's operations. The floor of the pit shall be sloped to drain away from the pit face.

(3) Unsuitable material shall be incorporated into a disposal area designated by the Contracting Officer Representative. Oversized rock encountered during the crushing operations shall be stockpiled, away from the pit face, in an area designated by the Contracting Officer Representative. Placement of oversized rock in the area immediately adjacent to the pit face being utilized for current operations will not be allowed. The Forest Service may elect to have the oversized rock broke down and run through the crusher or relocated to a different area in the pit, as well as any other unsuitable material. this work will be paid for separately.

(4) Any available topsoil material encountered in the "Area to be Developed", shown on the Pit Development Plan, shall be stockpiled in the area designated by the Contracting Officer Representative.

(f) Stockpile

(1) The stockpile site shall be located as indicated on the Pit Development Plan or approved by the Contracting Officer Representative. The floor of the pit shall be uniform in slope. The Contractor shall notify the Contracting Officer Representative prior to the start of any crushing operations, to allow sufficient time for cross-sectioning of the pit floor.

(2) The stockpile shall be built up in layers 1 to 4 feet in depth, then leveled.

Material shall be deposited in a manner which prevents segregating, cones are unacceptable. The completed stockpile shall be neat and regular in form and shall be made to occupy the smallest feasible area.

(g) Site Finishing

(1) At the completion of operations in the pit, all areas disturbed by the Contractor shall be neat in appearance. The pit face shall have all overhanging material removed and be finished to approximately a 1-1/2 to 1 slope, unless otherwise directed by the Contracting Officer Representative. The floor of the pit shall be sloped to drain away from the pit face, and in such a manner that water will not collect or pocket. Placement of oversized material or debris against a face of the pit which contains crushable material will not be allowed.

(2) Material placed in the Disposal Area shall not be placed against trees. The Disposal Area shall be covered with available suitable material and seeded as directed by the Contracting Officer Representative. The completed Disposal Area shall be neat and natural in appearance and shall blend with the surrounding area.

(3) A minimum 10 foot wide cleared area shall be maintained along the top edge of the pit face.

(4) Area which the Contracting Officer Representative determines contain no additional crushable material shall be finished to a minimum 3 to 1 slope upon completion of all crushing operations. Unsuitable material may be buried within the finished slopes when approved by the Contracting Officer Representative.

Any salvaged topsoil material shall be placed over these finished slopes as directed by the Contracting Officer Representative.

MATERIALS

(a) Crushed aggregate shall be crushed stone, crushed slag, or crushed gravel which conforms to the quality requirements of AASHTO M-147. Material shall be relatively free from excess vegetation, soft or disintegrated particles, lumps or balls of clay, or other deleterious substances.

During crushing operations it may be necessary to ‘reject’ material of a select gradation in order to produce finished material to the specified gradation. The approximate quantity to be rejected will be estimated by the contractor and agreed to by the COR prior to continuing operations. Reject material will be produced by continuous operation of the crushing plant and be stockpiled in an area designated by the COR away from the finished crushed material to avoid contamination. Reject material will be paid for by the CY as pay item 7 – Reject Material.

(b) Gradation Requirements

(1) Gradations of each designated size of aggregate shall be obtained by crushing and blending processes as may be necessary, and shall conform to the percentages shown on the following page:

Table 703-2 Target Value Ranges for Subbase and Base Gradation

Sieve Size Percent by Mass Passing Designated Sieve (AASHTO T 27 and T 11) Grading Designation

A (Subbase) B (Subbase) C (Base) D (Base) E (Base) Modified

2½ inch 100 2 inch 97 – 100 100 100

1½ inch 97 – 100 1 inch 65 – 79 (6) 80 – 100 (6) 100 ¾ inch 64 – 94 (6) 86 – 100 (6) ½ inch 45 – 59 (7) 100 ⅜ inch 40 – 69 (6) 51 – 82 (6) 80-100 (6) No. 4 28 – 42 (6) 40 – 60 (8) 31 – 54 (6) 36 – 64 (6) 36 – 74 (6) No. 40 9 – 17 (4) 12 – 26 (4) 12 – 35 (4) No. 200 4.0 – 8.0 (3) 4.0 – 12.0 (4) 4.0 – 7.0 (3) 4.0 – 7.0 (3) 6.0 – 12.0 (3)

( ) The value in the parentheses is the allowable deviation (±) from the target values.

3” and 6” Minus Material Requirements.

These materials shall be produced by running bank run material through the crushing plant to achieve a fractured 3” or 6” maximum particle size with natural fines. Screening only to produce this material is not acceptable. Some pits may need to have some additional fines cast off to increase rock content and will be paid for separately. There will be no gradation testing required for these materials; acceptance will be based on visual evaluation by the Contracting Officer Representative.

Table 705-1 Gradation Requirements for Riprap

CLASS 1 (Modified) % of Rock Equal or smaller by Count Range of intermediate dimensions (2) Range of

Rock Mass (3) 100 7-11 inches 28-110 pounds 50 5-8 inches 10-42 pounds 15 4-6 inches 3-18 pounds

(2) The intermediate dimension is the longest straight-line distance across the rock that is perpendicular to the rock’s longest face with the largest projection plane.

(3) Rock mass is based on a specific gravity of 2.65 and 85 percent of the cubic value as calculated using the intermediate dimension.

Riprap rock will be evaluated by visual acceptance and evaluation. (no sieve analysis required)

2) The gradation requirements represent the extreme limits which shall determine suitability of use from all sources of supply. Tests for aggregate gradation from one source shall be uniform and as near the midpoint of individual specification limits as possible.

(c) Filler or Binder - Additional filler or binder found within the pit’s boundary shall be added as needed to meet the gradation requirements or for satisfactory bonding of the material. Filler or binder shall be uniformly blended with the other material at the crushing plant.

(d) Quality Assurance

(1) The Contractor shall submit in writing a quality control plan with the following information: (a) The authorities and responsibilities of testing and inspection personnel, (b) The experience and qualifications of inspection and testing personnel, (c) the name and location of any testing facility (for hire) to be used.

(2) Contractor shall obtain samples, perform quality assurance tests and submit original test reports to the Contracting Officer Representative all in accordance with AASHTO T-27.

(3) Testing frequency shall be a minimum of 1 test per 2000 cubic yards processed. Additional sampling, testing, and reports may be required by the COR to ensure that gradation of the crushed aggregate meets contract requirements.

(4) Testing shall not be considered a final acceptance and shall not preclude later sampling and testing after final processing of the material. Such testing shall not relieve the Contractor of the responsibility of providing quality control measures to ensure compliance with contract requirements.

(5) The first test for each pit location shall be taken within the first 200 cubic yards crushed at each pit. This test shall be processed immediately, and the results shall be furnished to the Contracting Officer Representative before the end of the second day of crushing OR before 2000 cubic yards has been crushed, whichever comes first.

(6) Test results must be submitted to the Contracting Officer Representative at timely intervals throughout the Contractor's operations. All test results shall be submitted before final payment for contract quantities will be processed.

INSPECTION PROCEDURE

(a) Inspection will be made as work progresses to ensure compliance with contract items, conditions, and specifications. If any work is found unsatisfactory during on-site inspection, the unsatisfactory work will be reviewed with the Contractor by the Contracting Officer's Representative. The Contractor shall take prompt action to correct the deficiency at no additional cost to the Government.

METHOD OF MEASUREMENT

(a) Belt Scale

The crushing apparatus used by the Contractor must be equipped with a belt scale to measure output. The belt scale must meet the NIST handbook #44 specifications: and must be properly calibrated and certified per state requirements.

(1) The Contractor shall not begin crushing operations until the Contracting Officer Representative has verified the initial belt scale reading.

(2) Crushing operations shall not be completed until the Contracting Officer Representative has verified the final belt scale reading.

(3) Any shortage in contract quantities shall be the responsibility of the Contractor and shall be corrected before payment is issued.

(4) Material crushed in excess of the contract amount becomes the property of the Government with no restitution to the Contractor.

(b) Areial scan utilizing drone survey technology for verification of belt scale readings and other volumes that may need measurement.

PAYMENT

(a) The yardage of crushed aggregate, determined as provided above, shall be paid for at the contract unit price per cubic yard of material stockpiled. Yardage will be determined based on a unit weight of 3,000 pounds per cubic yard of material crushed. Price and payment shall constitute full compensation for furnishing labor and equipment, tools and supervision, performing required work, including all incidentals necessary to satisfactorily complete this contract in accordance with these specifications.

(b) One acceptable quality assurance test per 2000 cubic yards of aggregate will be paid for at the contract unit price.

(c) Upon completion and acceptance of all pit development items including final shaping and final cleanup, the pit development and restoration will be paid for as a total Lump Sum (all associated work at each pit) at the contract unit price.

(d) Upon completion and acceptance of the work performed and receipt of the quality assurance test reports, the Contracting Officer will process the Contractor's invoice for payment.

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