Measures to Mitigate Groundwater Movement in Utility Backfill Sample Clauses

Measures to Mitigate Groundwater Movement in Utility Backfill. For utilities subject to the mitigation requirement, as described in Section 5.2.1, mitigation measures shall include: • the use of low permeability backfill; and/or • cutoff features. Low permeability backfill may include a low strength grout mix known as controlled density fill (“CDF”), or “flowable fill”. This material is poured like grout, has low strength and therefore can be excavated by hand, and flows into gaps and around utilities. It can provide a low permeability restriction to water flow when used as utility backfill. Other low permeability fill materials may also be used if approved by NASA. If a granular backfill material is used in a trench, a cutoff feature will be installed a minimum of every 300 feet, and within 50 feet of branches in the distribution system. The cutoff feature will be a wall of low permeability material, such as bentonite, concrete, or CDF. The cutoff feature will be at least 2 feet thick and will span the width of the trench from the base of the trench to an elevation at least 3 feet above the highest expected groundwater level at the location. The sides of the cutoff feature shall be keyed into native soil. Some utilities subject to the mitigation requirement of this section may be installed in horizontal boreholes with no backfill. If it is determined that the native soil will collapse around the utility, no further mitigation is required. If, however, the borehole may remain open or a granular backfill is installed around the utility line, cutoff features will be installed as described above for trenches. This may require potholing to the borehole to install the cutoff feature, or installing plugs of low permeability material around the utility when it is installed.
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