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After a rainfall, construction equipment travel on the exposed site subgrade should be minimized
until the soils have been allowed to dry sufficiently. Otherwise, traffic activity on the wetted
subgrade will decade the exposed materials and result in admtional excavation of the disturbed
materials.
5.2.7 Structural Fill Construction
This section covers placement and compaction of earth materials to create Structural Fill. If
., grading is performed during the wet winter months, generally October through May, we
recommend that On -Site Fill Material be used only if it has been drained sufficiently well to
achieve the required compaction.
The On -Site Fill Material or Select Fill Material should be moisture conditioned to within 2 to 3
percent of Optimum Moisture Content, placed in level lifts not exceeding 8 inches in loose
thickness, and compacted to the specified percent compaction to produce a firm and tmvielding
surface.
If field density tests indicate the required Percent Compaction has not been obtained or the
surface is pumping and weaving under construction traffic, the fill material should be
reconditioned as necessary and recompacted to the required Percent Compaction before placing
any additional materal. If the fill still cannot be compacted to specifications (as stated herein), it
may be necessary to excavate and replace the unsuitable fill.
Fill slopes should be compacted by slope rolling and trimming, or should be overfilled and
trimmed back to plan grade to expose a firm, smooth surface free of loose material.
5.2.8 Utility Trench Backfilling and Compaction
This section covers backfilling of all utility trenches. The contractor should be responsible for
the safety of personnel working in utility trenches. We recommend all utility trenches, but
N particularly those greater than 4 feet in depth, be supported in accordance with state and federal
i
i safety- regulations. Due to shallow groundwater levels. groundwater infiltration into utility
J trenches must be anticipated and planned for by the contractor.
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