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Utility wench backfill should consist of Structural Fill constructed as recommended in Section
5.2.9. If backfilling is performed during periods of wet weather, it may not be possible to
achieve adequate compaction with On -Site Fill Material unless it is sufficiently well drained_
Within building areas, and the upper 2 feet below subgrade in pavement areas, utility trench
backfill should be compacted to at least 95 Percent Compaction; below 2 feet in pavement areas,
it should be compacted to at least 90 Percent Compaction. Particular care should be taken to
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make sure bedding or fill materal is properly compacted in place to provide adequate support to
the pipe. Jetting or flooding is not a substitute for mechanical compaction and should not be
allowed.
5.3 DRAINAGE
5.3.1 General
This section, covers the placement of aggregate drainzee materials and drain lines in the areas
and to the iines and grades shown on the plans.
The materials which should be used are as follows:
Capillary Break should consist of a minimum of 4 inches of free -draining sand and gravel
containing less than 5 percent fines (s+lt and clay size particles) based on the fraction passing the
3.4-inch sieve.
Free -draining Granular Material should consist of clean, free -draining gravel or crushed rock
^teet:ng the requirements of Section 9-03.12 (2), "Gravel Backfill for Walls," in the Standard
Specifications.
Drain Pipe should be a smooth -walled, rigid P: C or other rigid pipe conforming to the
minimum sizes and dimensions shown on the plans Corrugated plastic pipe should not be used
because it has a tendency to crush and become blocked, and is often laid without a gradient.
Vapor Barrier should consist of an impermeable membrane of reinforced plastic or equivalent
material.
60113601 601,RDS
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