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This may either be very good or very bad! In the event that the Sanitary Sewer
Line is in a state of good repair, the smoke will migrate along the sewer network and
appear at a distant manhole--or some other area where field technicians expect to see it
such as the sewer vent pipe on top of a residence. But in some cases, the smoke
doesn't reappear at all! Since it has to go somewhere, field technicians and
engineers begin a process of painstaking research to try and determine where, in fact, the
smoke is ending up.
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