7. Station operational considerations permit laying
back the slopes of the excavation.
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The Contractor shall submit a Shoring and Sheeting plan for approval 15
days prior to starting work. Submit drawings and calculations, certified
by a registered professional engineer, describing the methods for shoring
and sheeting of excavations. Shoring, including sheet piling, shall be
furnished and installed as necessary to protect workmen, banks, adjacent
paving, structures, and utilities. Shoring, bracing, and sheeting shall be
removed as excavations are backfilled, in a manner to prevent caving.
3.5.2
Geotechnical Engineer
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NOTE: Where site conditions require extensive
monitoring of excavations and water levels include
the following requirement.
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The Contractor is required to hire a Professional Geotechnical Engineer to
provide inspection of excavations and soil/groundwater conditions
throughout construction. The Geotechnical Engineer shall be responsible
for performing pre-construction and periodic site visits throughout
construction to assess site conditions. The Geotechnical Engineer shall
update the excavation, sheeting and dewatering plans as construction
progresses to reflect changing conditions and shall submit an updated plan
if necessary. A written report shall be submitted, at least monthly,
informing the Contractor and Contracting Officer of the status of the plan
and an accounting of the Contractor's adherence to the plan addressing any
present or potential problems. The Geotechnical Engineer shall be
available to meet with the Contracting Officer at any time throughout the
contract duration.
3.6
GRADING AREAS
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NOTE: When spoil areas or borrow areas are within
the limits of Government-controlled land, additional
requirements based on the following, and as
appropriate for the project, will be included in the
contract document. Locations of areas will be
indicated, or the approximate distances from the
project site will be specified. Generally, unburned
vegetative material and surplus excavated material
will be disposed of in inconspicuous spoil areas
where no future construction is planned. If
economically justifiable, surplus suitable excavated
material may be stockpiled or may be disposed of in
areas where future construction is planned and where
fill will be required. Spoil materials will be so
placed and the worked portions of spoil areas and
borrow areas will be so graded and shaped as to
minimize soil erosion, siltation of drainage
channels, and damage to existing vegetation. The
degree of compaction will be specified.
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Where indicated, work will be divided into grading areas within which
SECTION 02300
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