FBO 13_site prep calvit 420.doc

Construction Specification 420 – Site Preparation

1. Scope The work shall consist of the excavation and/or earthfill placement required by the drawings and specifications.

2. Classification Site preparation will be classified in accordance with the following definitions.

Class A Site Preparation. Site preparation requiring a combined volume not more than 200 cubic yards of required excavations and/or earthfill placement.

Class B Site Preparation. Site preparation requiring a combined volume of 201 to 400 cubic yards of required excavations and/or earthfill placement.

Class C Site Preparation. Site preparation requiring a combined volume of 401 to 600 cubic yards of required excavations and/or earthfill placement.

Class D Site Preparation. Site preparation requiring a combined volume of 601 to 900 cubic yards of required excavations and/or earthfill placement.

Class E Site Preparation. Site preparation requiring a combined volume of 901 to 1200 cubic yards of required excavations and/or earthfill placement.

Class F Site Preparation. Site preparation requiring a combined volume of 1201 to 1500 cubic yards of required excavations and/or earthfill placement.

Class G Site Preparation. Site preparation requiring a combined volume of 1501 to 2000 cubic yards of required excavations and/or earthfill placement.

3. Excavation

Excavations required to prepare the site shall be done in accordance with the requirements of Construction Specification 21. All excavations shall be unclassified excavations. The depths of excavations as shown on the drawings are approximate. The actual depth and extent of excavations will be determined after examination of materials encountered.

Suitable materials resulting from required excavations shall be used for the required earthfills and backfills. Any materials not utilized in the required fills shall be disposed of in the waste area. These materials shall be approved on site prior to placement.

In Construction Specification 21 the following shall apply:

Section 4, Use of Excavated Materials - Method 1 - There is no guarantee that materials obtained from the specified excavations may be used directly in specified fill areas. Stockpiling of selected materials to insure their availability for use in specific zones of the fill areas may be required. Additional compensation will not be made for stockpiling of excavated materials. Cost for stockpiling of excavated materials shall be included in the compensation for the bid items for Site Preparation.

Section 5, Disposal of Waste Materials - Method 1 - The disposal of the excavated materials shall include transporting, depositing, and spreading the materials to and on the designated fill or waste areas. The area on which each load of material shall be deposited shall be approved on-site beforehand. The surfaces of waste areas shall be dressed to be reasonably smooth and to be free of mounds, dips, windrows, or depressions which would prevent the safe operation of ordinary farm equipment thereon and the finished surface of waste areas will not be made. Cost for disposal of excavated materials and dressing of the surfaces of waste areas will be included in the compensation for the bid items for Site Preparation.

4. Earthfills Earthfills required to prepare the site shall be placed in accordance with the requirements of Construction Specification 23. All compaction shall be Class C in accordance with Section 6 of Construction Specification 23. Compaction shall be accomplished by two (2) passes of the hauling equipment or an approved equivalent method. The in place moisture content of the earthfill material shall range from 12% to 18% by weight as determined by NRCS personnel using the feel method, or other appropriate methods. The moisture content of the backfill materials when placed shall be adjusted as necessary to meet the requirements. Fill lifts shall not be more than 9” thick prior to compaction and the maximum allowable particle size shall be 6”. Earth backfill lifts adjacent to pipes shall not be more than 6” thick prior to compaction, and the maximum particle size shall be 3”.

5. Measurement and Payment

The number of each class of site preparation will be counted. Payment for each class of site preparation shall be made at the contract lump sum price for that class of site preparation. Such payment will constitute full compensation for all labor, equipment, materials and all other items necessary and incidental to the completion of the work.

Compensation for any item of work described in the contract but not listed in the bid schedule will be included in the payment for the item of work to which it is made subsidiary. Such items and items to which they are made subsidiary are identified in Section 6 of this specification.

6. Items of work and construction details

Items of work to be performed in conformance with this specification shall include all excavation. and earthfill.

The class of site preparation is based on quantities derived from preliminary survey data. Variations in these quantities may be possible when the work is actually performed. However, modification to the contract will not be made for work performed in excess of these estimated quantities except under the following conditions:

(a) The variation must exceed 10% more than the maximum quantity established for the class of site preparation and have a minimum contract value for the additional work in excess of $1,000.00. (The contract value is to be determined by dividing the lump sum amount in the bid schedule by the applicable maximum yardage for the class of site preparation shown for the contract item in the table of quantities.) If the variation exceeds 10% and $1,000.00, the class of site preparation will be adjusted and paid for at the rate for the adjusted class.

(b) It is the Contractor's responsibility to submit proof that the estimated site preparation class in question exceeds the percentage and cost parameters in item (a) above. Proof will consist of applicable survey data or other measurements made by a qualified surveyor in accordance with recognized professional practice and the contract specifications.

(c) The survey data or other measurements as applicable shall be presented to the NRCS prior to any work on the contract item for which the quantity is questioned. Three working days shall be provided to the NRCS to verify data prior to the beginning of work for this contract item.

(d) A final survey or other measurements as applicable shall be made and presented to the NRCS after the work is completed which will allow measurement for the quantity in question. If this survey data indicates justification for a contract modification within the parameters of item (a) above, it will be made in accordance with the changes clause contained in the contract.

a. Bid Item 2, Site Preparation

(1) This item shall consist of performing all items of work for Site Preparation as required in Section 1 of this specification for the removal and disposal of the bridge and removal of the bridge access road.

(2) Road surfacing material (gravel) shall be stockpiled separate from other excavated materials.

(3) Stockpiled road surfacing material shall be placed after all other earthfill has been placed . The stockpiled road surface materials shall be placed as a final surface.

b. The following site preparation classes shall apply to this site:

(1) Bid Item #2, Class “E” Site Preparation.