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# Title
 1  2003 - 12/22/2003 - Registered professional engineer approval requirements for combination trench shield and sloping system trenches with a depth greater than 20 feet.
 2  1993 - 07/16/1993 - Minimum length that an excavation must be before a protective system is required.
 3  1976 - 07/07/1976 - Trenching Requirements related to banks.

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