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Space-tight, Time-spread cluster

You see a case here where the breaks started in 1974 and came several years apart until 2001 when we put a SeeSnake on it. What we saw there made us cut in this extra valve and replace just half a block, the cluster was so concentrated. Before I flip to that view, notice this main two blocks west, where it had just started to have a few breaks at the same time.

© Roy Brander, P.Eng 2016