GPRS Uses Smoke Test to Verify Existing Plans of Rail Yard Stormwater System

• The client wanted to verify existing as-built documentation of a stormwater system at a rail yard in Denver, Colorado
• The client wanted to know what manhole structures were connected, to help them plan upcoming operations & maintenance
• Jetting this expansive system and then documenting it with a remote-controlled sewer inspection crawler was both cost and time prohibitive

• A GPRS Project Manager conducted a smoke test of the stormwater system, sending non-toxic smoke through the lines to see where it escaped to determine which manholes were connected
• This test verified the accuracy of the client’s existing plans, confirming which manholes were connected and which were part of a separate system
• The work was completed in one day on site – roughly a third of the time it would have taken to examine the system with a remote-controlled crawler

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• The client was able to quickly and efficiently verify the accuracy of their existing plans
• Planning for future operations & maintenance can be completed responsibly with this accurate map of the stormwater system
• GPRS’ smoke test saved the rail yard owner time and money they would have otherwise spent on jetting the stormwater system and then inspecting it with a remote-controlled crawler equipped with CCTV cameras

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