After washing a tank three times in preparation for hot work, the hydrocarbon concentration remains at 1%. The orders are to gas-free the tank. The next step is to

• A. Enter the Space Using Non-Sparking Tools
• B. Call CHEMTECH to Ask Why There Is Still Hydrocarbon Vapor in the Tank
• C. Wash Again and Test Until Hydrocarbons Are at 0%
• D. Since the Hydrocarbon Vapor Is Low, Ask for a USCG Waiver to Deem the Tank Gas Free

Answer: (C)