Is there a standard recommended clearance for vibratory compaction of HMA mat overlying an existing pipepline? I have an existing waterline about 3.5 to 4 feet below the ashphalt layer being compacting. Is that enough clearance to use vibratory compaction method of the mat? I have been looking for a reference on this, but have yet to find anything substantial or conclusive. There is about 26-29 inches of clearance above the pipe. This material is predominantly SP or SM classification. The pavement section on top of the subgrade is 16 inches thick.
Thanks for your assistance.
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