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SAFE WORK PRACTICES FOR CONTRACTORS WORKING AT RETAIL PETROLEUM/CONVENIENCE FACILITIES 43 products to the UST,a suitable metal funnel shall be used.The container should be in constant contact with the funnel while pour- ing to avoid buildup of static electricity.Petroleum products shall not be poured into UST fills without the use of a funnel.Any fuel that drips into the spill bucket around the fill shall be drained back to the storage tank or cleaned up immediately. 14.10 WORKING ON TANKS AFTER THEY HAVE BEEN REMOVED FROM AN EXCAVATION 14.10.1 Atmospheric Hazard After a UST is removed from the ground,a hazardous atmosphere may return to the inside of the storage tank,even if it had been properly purged or inerted for removal. Conditions such as weather,outside temperature,and the method previously used for purging/inerting the UST may affect the safety of the atmosphere inside the tank. In many areas it is common to cut holes in a UST after it has been removed from the ground to prevent the tank from being used again,or to satisfy transportation requirements.Operations such as these that physically affect a UST after it has been removed from the ground shall not begin until the hazardous atmosphere inside the tank has been tested and purged or inerted to a safe Con- dition under the direction of a certified UST installer.Many jurisdictions have special rules for performing this activity.It is the responsibility of the contractor and certified UST installer to understand all applicable rules and regulations,and to be sure that the atmospheric hazard inside a storage tank has been properly abated before and during any work. 14.10.2 Roll hazard Work may not begin on a UST after it has been removed from the ground without providing protection against the possibility that the tank may roll.Storage tanks shall be stabilized before work begins. 14.11 EQUIPMENT USED FOR REMOVING VAPORS FROM A TANK(CERTIFICATION REQUIRED) Purging or inerting vapor from a UST shall be conducted under the direction of a UST installer certified in the jurisdiction where the work is taking place.Equipment, including vacuum devices that are not labeled/certified as explosion-proof(such as a shop Type vacuum)shall not be used to remove vapors from a UST. 14.12 ENTERING UNDERGROUND STORAGE TANKS Underground storage tanks shall not be entered by workers without prior written permission from the UST owner. Entry into USTs is a very hazardous and specialized task and shall only be performed by appropriately trained individuals.All USTs are con- fined spaces.Additional state and local regulations may apply for this activity. 14.13 UST MONITORING SYSTEMS UST monitoring systems take many forms and are manufactured by a variety of companies.The most common types of monitor- ing performed by these devices are: fluid level, • tank leak detection, • interstitial space level(liquid or vapor space between layers of a double-wall tank), • sump/catch basin level(liquid or vapor)beneath dispensers,turbine pumps,or other areas with a containment sump, • electronic line leak detection. Some monitoring systems may also be used for other types of monitoring. 14.13.1 Moving Sensors Prohibited In many jurisdictions specific positioning and operational condition of the sensors is a legal requirement for operating a fueling system.In these jurisdictions sensors shall not be disabled or moved from their regulatory required positions.It is the responsibil- ity of the contractor performing the work to know and understand the regulations that govern sensor placement in the areas where they will be performing work. 14.14 PERSONAL PROTECTIVE EQUIPMENT When working on pressurized fueling systems,goggles or a face shield may be needed if a spray or splash hazard exists.In addi- tion,flame resistant clothing(FRC)may be needed if a fire hazard exists.Nitrile gloves may be required to protect hands against