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7.9.3.3. After tank entry and atmospheric check, verify that all vents and other areas where liquids or potentially dangerous vapors could enter the tank are sealed. 7.9.3.4. Verify that the customer has removed or capped the submersible pump. Plug supply lines if they are not plugged already. 7.9.3.5. Plug manifold vent lines by inserting expandable plugs or forcing the ball of a check-valve mechanism tightly against the fitting. 7.9.3.6. Enclose any suction and siphon lines in plastic or cap them to prevent fuel leaks or drips. 7.9.3.7. Immediately evacuate the tank if the attendant alerts you of a potentially dangerous condition. 7.9.3.8. On rare occasions, you may be required to remove fluid (product or water) from the interstitial space of a tank. Because the fluid may contain flammable vapors (gas), you must exercise extreme caution when performing this work. A procedure called "Removing Fluid from the Bottom of Ribs While Tank is in Ground" is located in the Field Service Technician's Manual. 7.10. Closing the Tank Entry Work Permit 7.10.1. Authorized Tank Entrant Responsibilities 7.10.1.1. Remove all pipes, plugs or caps. 7.10.1.2. Remove all tools and equipment. 7.10.1.3. Safely exit tank. 7.10.2. Site Supervisor Responsibilities 7.10.2.1. Complete parts B and C of the Tank Entry Work Permit. 7.10.2.2. Close the completed permit, return it to the plant, and retain it with the service alert file. 8.0. GENERAL RESPONSIBILITIES 8.1. Plant Manager Responsibilities 8.1.1. Select qualified individuals to,be part of the field service crew. 32