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  1. caissondriller

    Backfilling corrugated pipe {caisson}

    In loose sand and gravel {5-8-5 blows per six} we are advancing 42” steel pipe to 15 or 16 feet. After steel pipe is set permanent 36” corrugated pipe {CMP} is set. After 36” CMP is backfilled with existing drilled spoils, the 42” casing is extracted. A steel plate is set on the 36” CMP and...

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