SAN DIEGO - Section 8425 is for operation of gassy and extra-hazardous tunnels. It requires equipment in tunnels that presents a fire or explosion hazard to be acceptable to the Division. "How?" Jackson asked. "Is there a list?"Why does (f) require the Division to be notified immediately whenever gas levels in excess of 10% of LEL are encountered, and what is "extra care"?SEPARATE UNDERGROUND CONSTRUCTION FROM TUNNELSAfter Jackson had completed his questions about 8416 - 8425, George Brown of
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