Gold Mountain Community Services District

Review, discuss existing, charged propane lines in utility easement.BACKGROUNDPropane lines are considered abandoned when a licensed propane provider does not have responsibility for the lines. Abandoned propane lines pose several significant safety risks if they are not properly decommissioned. Because propane is heavier than air and highly flammable, an unmanaged line can become a silent hazard. Unmapped abandoned lines pose an even greater hazard as the lines will not be identified during 811 marking as a provider does not exist.Key Risks of Abandoned Lines• Residual Gas Accumulation: Even if a tank is disconnected, residual liquid propane can remain in the low points of a line. As temperatures change, this liquid can vaporize, creating enough pressure to leak out of aging seals or open ends.• Propane Pooling: Since propane is denser than air, any gas escaping from an abandoned line will settle into low-lying areas like basements, crawlspaces, or utility vaults rather than dissipating. This creates an invisible "pool" of explosive gas. Because it accumulates rather than rising, a small leak can eventually create a massive, invisible "bomb" waiting for an ignition source.• Corrosion and Soil Leaks: Underground lines that are not maintained will eventually succumb to corrosion. If a line is inadvertently reconnected or if gas is trapped inside, a leak can saturate the surrounding soil.• Odorant Fade: Propane is treated with ethyl mercaptan to give it a "rotten egg" smell. In abandoned lines, moisture and rust (iron oxide) can react with this chemical, causing the smell to fade. You may have a significant leak without the warning scent.• Accidental Reconnection or Damage: Abandoned lines are often forgotten during renovations or landscaping. A contractor might accidentally strike a line with a shovel or backhoe, or a new homeowner might mistakenly attempt to hook a new appliance to an old, compromised line.When a propane system is partially dismantled but lines are left in place, "dead-end" sections are created.• Thermal Expansion: If liquid propane was trapped in the line when it was shut off, changes in outdoor temperature can cause the internal pressure to skyrocket, potentially rupturing the pipe.• Residual Gas: Even a "depressurized" line often contains enough residual vapor to cause a flash fire if a homeowner or contractor cuts into it thinking it is an old water or electrical conduit.