3.4
3.5
3.6
shall be refilled and compacted in accordance with these specifications at
CONTRACTOR’s expense with fill approved by ENGINEER.
EXCAVATION FOR UTILITY TRENCHES
A.
Excavate as necessary for installation of utilities including, culverts, leachate
collection and transmission system pipe, and for related structures and
appurtenances.
Excavations for utilities shall be carried out in a manner that will preserve the
undisturbed state of the subgrade soils. Dewatering shall be performed as
needed to provide a dry excavation.
Excavation of trenches required for the installation of subsurface utilities shall
be made to the depths indicated on the Drawings and in such a manner and to
such widths as will give suitable room for laying the pipe within the trenches,
for bracing and supporting, and for drainage facilities. CONTRACTOR shall
render the bottom of the excavations firm and dry, and acceptable to the CQA
Consultant.
MISCELLANEOUS EARTHWORK
A.
CONTRACTOR shall perform earthwork as necessary to permit the placement
of topsoil, for constructing access roads, and any other miscellaneous earth
excavation required.
SUBGRADE PREPARATION
A.
Prior to placing earth materials, the subgrade should be compact, dry, and free
from debris, ice, and snow. Earth materials shall not be placed over frozen soil
unless otherwise approved by ENGINEER.
CONTRACTOR shall excavate in such a manner as to limit disturbance of the
underlying natural ground. Deterioration of the subgrade between the time of
excavation and initial fill placement shall be the responsibility of
CONTRACTOR and shall be repaired at CONTRACTOR’s expense.
All subgrade surfaces shall be observed by the CQA Consultant prior to earth
placement. Sufficient time must be given to the CQA Consultant to observe and
perform tests on the subgrade.
Subgrade for pavement or geosynthetic placement shall be proof-rolled by at
least four (4) passes of a 10,000-pound vibratory, smooth-drum roller to
demonstrate strength. The subgrade shall be smooth and uniformly graded
and shall be prepared to the grades indicated on the Drawings. All objects
capable of penetrating the overlying geosynthetics, including, but not limited
File No. 3066.09 Earthwork 02200 - 8 of 14 December 2017
