Specs

Bridgestone Retail Operations, LLC
PROJECT MANUAL
Version: January 2012
3.03 TRENCHES 5 FEET OR LESS IN DEPTH:
A. The Contractor shall maintain vertical sides of the trench. The minimum and maximum width
of trench is set out on the Drawings.
B. The Contractor shall provide and install any sheeting, shoring and bracing as necessary to
provide a safe work area as required to protect workmen, structures, equipment, trees, etc.
The Contractor shall be responsible for the design and adequacy of all shoring, bracing and
sheeting. The Contractor shall remove shoring, bracing and sheeting, as the excavation is
backfilled, in such a manner as to prevent injurious caving.
3.04 CONSTRUCTION METHODS
A. The Contractor shall schedule the excavation of pipe trenches at such times and in such
sequence as to present the least interference with other items of the work and the operation
of the existing facilities.
B. The Contractor shall place excavated material in a manner that will not endanger the work,
and will avoid obstructing sidewalks and driveways. Gutters shall be kept clear.
3.05 UNAUTHORIZED OVEREXCAVATION:
A. If the Contractor should excavate below the proposed trench grade (without authorization of
the Engineer) the Contractor shall correct the grade by filling in with cement stabilized sand
or crushed stone embedment as shown on the drawings.
3.06 TREES, STUMPS OR ROOTS:
A. Where trees, stumps or roots are encountered, and they shall be removed and disposed of
by the Contractor. Roots shall be cut off flush with the sides of the trench.
3.07 ROCKS, BOULDERS, EXISTING STRUCTURES, ETC.:
A. Where rocks, boulders, existing structures or other unsuitable soil conditions are
encountered, they shall be removed by the Contractor to a depth of 12 inches below the
grade line for the full width of the trench and refilled with cement or crushed stone
embedment.
3.08 MAINTENANCE OF FLOW IN SEWERS AND DRAINS:
A. The Contractor shall made adequate provision for maintaining the flow of sewers and drains
encountered during construction.
3.09 DEWATERING:
A. The Contractor shall keep the pipe trench free from water by use of bailing, pumping, well
points or any combination as the particular situation may warrant. It is the intent of these
specifications to install pipe on a firm dry bed.
B. All dewatering methods and procedures are subject to the approval of the Engineer. The
cessation of the dewatering operation will be accomplished during a sufficient period of time
to insure that there is no displacement of the pipe due to unequal hydrostatic pressure.
3.10 UNSTABLE TRENCH BOTTOM:
A. When the soil encountered at the established bedding grade is quicksand, muck or similar
unsuitable material, the Contractor shall proceed as follows:
PIPE TRENCH EXCAVATION AND BACKFILL 02226 - Page 2 of 4