EarthworkBessey Complex RSI.doc

SECTION 02225A

Earthwork

PART 1 - GENERAL

1.1 SUMMARY

A. Work shall include excavation, shaping, and compaction of campsites; borrow excavation; excavation of unsuitable material; and disposal of all excavated material necessary for the completion of campsite road spurs, living areas, and subsidiary work.

B. Embankment work includes placement and compaction of additional fill needed to raise campsite subgrades to elevations indicated on the drawings. Incidental embankment work includes the excavation and haul of borrow material from campsites where excess material needs to be removed in order to lower the subgrade to elevations indicated on the drawings and from designated borrow sources.

1.2 PAYMENT

A. The accepted quantities will be paid for at the contract unit price for each pay item shown in the BID SCHEDULE.

B. Water for compaction, if needed, will be paid for by Bid Item No. 21.

PART 2 – PRODUCTS NOT APPLICABLE

2. NOT APPLICABLE

PART 3 – EXECUTION

2.1 UTILIZATION OF EXCAVATED MATERIALS

A. All suitable, excavated material shall be used in the construction of campsite subgrades as SHOWN ON THE DRAWINGS.

1. Excavation of Unsuitable Material:

a. Unsuitable material shall be excavated. Disposal will be as SHOWN ON THE DRAWINGS. Excavated areas shall be backfilled with suitable material when necessary to complete the work. Frozen material shall not be placed in embankments.

2.2 FINISHING subgrades

A. The subgrade shall be visibly moist during shaping and compaction. Low sections, holes, or depressions shall be brought to grade with suitable material approved by the CO. Final compaction of the subgrade shall meet the requirements of the embankment placing method specified.

2.3 SNOW REMOVAL

A. Snow or ice shall not be incorporated in the embankment. Snow shall be removed in advance of the work and deposited beyond the roadway limits in a manner that will not cause resource damage or waste material.

2.4 EMBANKMENT PLACING METHOD

A. Specific Methods:

spec writer: edit method below

1. All embankments shall be placed by Method 3, except as specified in paragraph C below.

a. Method 3. Layer Placement (Roller Compaction): Embankment shall be layer placed. Each embankment layer shall be leveled, smoothed, and compacted before placement of subsequent layers.

1) Placement shall be in horizontal layers not exceeding 6 inches prior to compaction. Compaction equipment shall be operated over the full width of each layer until visible deformation of the layer ceases or in the case of the sheepfoot roller, the roller "walks out" of the layer. At least three complete passes shall be made.

2) Compaction equipment shall be capable of obtaining compaction requirements without detrimentally affecting the compacted material. The compacting units may be of any type, provided they are capable of compacting each lift of material as specified and meet the minimum requirements contained herein. Minimum requirements for rollers are as follows:

3) Tamping or sheepsfoot rollers shall meet the following minimum requirements:

4) Diameter - 40"

5) Completely filled with liquid.

b. Vibratory steel-wheel rollers shall have a minimum weight of 6 tons. The compactor shall be equipped with amplitude and frequency controls and specifically designed to compact the material on which it is used.

c. Pneumatic-tire rollers shall have smooth tread tires of equal size that provide a uniform compacting pressure for the full width of the roller and shall meet the following minimum requirements:

d. Towed rollers:

1) Ballast density shall exceed 100 pounds per cubic foot

2) Volume of ballast shall exceed 7 cubic feet per tire

3) Tire pressure shall exceed 45 pounds per square inch

e. Self propelled rollers:

1) Shall exert a force that exceeds 200 pounds per linear inch of rolling width.

B. Compact backfill in holes where tree stumps are removed under this contract or were removed by others prior to this contract in the same manner as specified in paragraph A above.

C. Compaction next to retaining walls shall be done with smaller mechanical equipment in order to avoid deflection of the retaining walls.

END OF SECTION 02225A

02225A - 1

EARTHWORK