This detail specifies the installation requirements for a joint trench housing a one-and-a-half-inch polyvinyl chloride domestic water service line and a fire service line. The assembly requires a minimum cover of thirty-six inches from the finish grade to the top of the pipe zone. The trench is backfilled with sand to provide bedding and protection for the utilities. A horizontal separation of twelve inches is maintained between the domestic water service and the fire service, with a ten-inch clearance provided from the trench walls to each respective pipe.
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