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What is undercutting? I assume you are referring to the slab here?Quoted
Without running the system long enough to cause undercutting you can't really tell without digging.
What are implications of a loop? How can I know if a loop was put in? If a loop was put in, what does this mean in rerouting the 3 lines found thus far? Will it do nothing?Quoted
Or your line may have been put in as a loop to help with pressure and flow.