23_Power Trench Sand and Backfill Requirements - Apr 2013.pdf
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- FA486125R0003
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This document is a technical standard for trenching requirements issued by Valley Electric Association, Inc., specifying detailed guidelines for underground distribution system installation. The standard covers comprehensive procedures for trench preparation, bedding material placement, and backfill requirements, including precise specifications for sand material gradation, compaction, and soil composition. Key technical requirements include using clean, granular pre-moistened sand for bedding, maintaining specific sand depths around cables or conduits (4 inches below and 12 inches above), and ensuring native soil backfill meets strict material composition criteria such as limiting rock size, avoiding decomposable organic materials, and controlling soil plasticity. The document also outlines approval processes for trench sand suppliers, which are valid for two years and contingent on continued compliance with VEA standards.
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Trench Sand pg1 Trench Sand pg2
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