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0 0 SAFE WORK PRACTICES FOR CONTRACTORS WORKING AT RETAIL PETROLEUM/CONVENIENCE FACILITIES 35 29 CFR 1926.550 29 CFR 1910.180 29 CFR 1910.184 These may be obtained from OSHA's website at http://www.osha.gov/index.html 11 Confined Space Entry Minimum Required Knowledge 11.1 DEFINITION OF A CONFINED SPACE AND PERMIT REQUIRED CONFINED SPACE Confined Space:means a space that is large enough for a person to enter,has limited or restricted means for entry/exit,and is not designed for continuous occupancy. 11.2 TYPES OF CONFINED SPACES,INCLUDING TYPICAL SERVICE STATION EXAMPLES For typical work at retail petroleum/convenience sites, the most common confined spaces are sumps, manholes, and pits atop underground storage tanks.Additional confined spaces that may exist include:storage tanks,storm water management systems, sewer manholes,trenches,excavations,oil-water separators,waste lift-stations,any other water or waste handling systems large enough for human entry,and crawl spaces associated with buildings. 11.3 PERMIT REQUIREMENTS FOR CONFINED SPACES A permit is required for confined space entries if the space meets the definition of a permit-required confined space.A standard- ized,multi-permit form is provided in Appendix B.3.Only a person who has received detailed confined space training in addition to this overview should be allowed to determine the following classifications of confined spaces. 11.3.1 Permit-required Confined Space (Permit Space) A permit required confined space: • contains or has a potential(likelihood)to contain a hazardous atmosphere or,contains a material that has the potential for engulfing someone who enters. • Is configured such that a worker may be trapped or buried by inwardly converging walls,as in a trench excavation. • Contains any other recognized serious safety hazard. For example,a tank top sump or pit is always a confined space.It may be classified as a non-permit required confined space if the above conditions do not apply. 11.3.2 Non-permit Confined Space A non-permit confinded space means a confined space that does not meet the criteria of a permit-required confined space.A space may only be deemed"non-permit required" following completion of a Pre-Entry Checklist(see multi-permit form, Appendix B.3). 11.3.3 Hazardous Atmosphere A hazardous atmosphere is an atmosphere that may expose workers to air not acceptable for human breathing or may create a haz- ardous situation: • a combustible or flammable gas, • low oxygen concentrations, • levels of toxic substances. 11.4 BARRICADING/PROTECTING/ISOLATING WORK AREA Before beginning work,barricade the�wrk area to prevent unauthorized persons and vehicles from entering.