final bid specs 09328.pdf - Freese and Nichols, Inc.

1.05 JOB CONDITIONS
A. Review subsurface investigations. A limited subsurface investigation has been performed by
Kleinfelder. A geotechnical report from that investigation is available at the Engineer’s office.
However, the precise profile of soil and rock strata beneath this site is not known.
2.00 PRODUCTS
2.01 MATERIALS
A. STRUCTURAL EARTH BACKFILL: Structural backfill shall be Class 4 Earth Fill as specified
in Section 31 05 13,SOILS FOR EARTHWORK.
B. TOPSOIL: Topsoil shall be Class 12 Earth Fill as specified in Section 31 05 13, SOILS FOR
EARTHWORK.
C. FINE-GRADED GRANULAR MATERIAL: Clean mixture of crushed stone, crushed gravel,
and manufactured or natural sand; ASTM D 448, Size 10, with 100 percent passing a 3/8-inch
sieve, 10 to 30 percent passing a No. 100 sieve, and 5 to 15 percent passing No. 200 sieve;
maximum plasticity index of 7; complying with deleterious substance limits of ASTM C 33 for
fine aggregates.
2.02 COMPACTION EQUIPMENT
Compaction equipment shall conform to the following requirements and shall be utilized as
specified herein.
A. PNEUMATIC ROLLERS
Pneumatic rollers shall have a minimum of four (4) wheels equipped with pneumatic tires.
The tires shall be such size and ply as can be maintained at tire pressures between 80 and
100 pounds per square inch for a 25,000 pound wheel load during roller operations. The
roller wheels shall be located abreast and be designed so that each wheel will carry
approximately equal load in transversing uneven ground. The spacing of the wheels shall be
such that the distance between the nearest edges of adjacent tires will not be greater than
50% of the tire width of a single tire at the operating pressure of a 25,000 pound wheel load.
The roller shall be provided with a body suitable for ballast loading such that the load per
wheel may be varied, from 18,000 to 25,000 pounds. The roller shall be towed at speeds not
to exceed ten (10) miles per hour. The character and efficiency of this equipment shall be
subject to the approval of the Engineer.
B. VIBRATORY ROLLERS
Vibratory rollers shall have a total static weight of not less than 20,000 pounds, with at least
90% of the weight transmitted to the ground through a single smooth drum when the roller is
standing in a level position. The diameter of the drum shall be between 5 and 5.5 feet and the
width between 6 and 9 feet. The unsprung weight of the drum, shaft, and internal mechanism
shall not be less than 12,000 pounds. The frequency of vibration during operation shall be
between 1,100 and 1,500 i.e., and dynamic force shall not be less than 40,000 pounds at
1,400 i.e. No backing of the vibratory roller will be allowed on the embankment unless the
vibrating mechanism is capable of being reversed. Self-propelled and towed vibratory rollers
shall be operated at speeds not exceeding 3 miles per hour and 1.5 miles per hour,
respectively.
C. POWER HAND TAMPERS AND VIBRATORY PLATE HAND COMPACTORS
Compaction of material in areas where it is impracticable to use a roller or tractor shall be
performed with approved power hand tampers, vibratory plate hand compactors, or other
approved equipment. Approval shall be based upon performance in a test section.
Structural Excavation and Backfill 31 23 10-2
DPR09328