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Thr contractor should submit samples of each of the required earthwork materials to the
fi 04 geotechnical engineer for evaluation and approval prior to use. The samples should be submitted
at least 4 days prior to their use and sufficiently in advance of the work to allow- the contractor to
identify alternative sources if Lhe material proves unsatisfactory.
s! 5.2.4 Seepage Control
Runoff or groundwater seepage that would interfere with the contractor's work should be
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y controlled during construction. Control may consist of temporary drainage ditches or subsurface
drains. Installation of such measures shou'.d be the contractor's responsibility.
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5.? 5 Clearing and Stripping
3 The building area of the site should initially be cleared and stripped of asphalt pavement
currently located at the site. Debris from the removed pavement should be removed offsite and
disposed of properly.
5.2.6 General E.rcavation
General excavation consists of removing unsuitable on -site soils to sufficient depth to achieve
design grades. The contractor should be responsible for excavating and disposing of or reusing
excavated material. Estimated depths of excavation range from approximately 1 to 4 feet,
... depending on the specific location. In general, the on -site soils can be excavated using standard
earthmoving equipment. If earthwork operations are performed during periods of wet weather,
these soils may deteriorate in the excavation process.
After design grade is reached, exposed soils should be proofrolled and or hand probed to identify
soft or unstable areas requiring additional excavation and replacement with Structural Fill.
Proofrolling should be accomplished with a heavy, rubber -tired vehicle such as a loaded dump
truck or a` steel drum vibratory roller. Hand probing should be performed by our field
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engineering technician with a lit -inch -diameter steel bar. These procedures help delineate soft
or weak soils. Soft soils encountered during proofrolling and hand probing should be excavated
and re -placed with Structural Fill. All final surfaces exposed b;: the complete excavation should
be finished true to line and grade and present a smooth, firm surface.
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