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0 9 Work involving the use of flame, arc, spark or other source of ignition is prohibited within a confined space that contains or is likely to develop a flammable and/or explosive atmosphere. Whenever inert gases such as Nitrogen are used to prevent the ignition of flammable gases or vapors for work using flame, arc, spark or other source of ignition will be permitted unless the oxygen concentration is maintained at less than 20% of the concentration that will support combustion. • Oxygen testing will be conducted with sufficient frequency to ensure conformance with the procedure requirements. • A written record of the oxygen testing results shall be made and maintained at the work site for the duration of the work. • All employees may review and record the testing results. • Only approved lighting and electrical equipment, Class 1 Division 1, is permitted to be used within a confined space subject to dangerous air contamination by flammable and/or explosive substances. • Employees assigned work within a confined space, which last contained corrosive or skin absorbed substances, shall be provided with and must wear the appropriate personal protective clothing and/or devices. Confined Space Entry Permit No employee is permitted to enter any confined space without a confined space entry permit that must be completed by the Supervisor and reviewed and approved by the Regulation Compliance Manager. .A completed permit must have the following: 1. Required Signatures for a Confined Space Entry Permit 2. Supervisor of the Project 3. Standby Observer of the Project 4. Atmosphere Tester of the Project 5. Each person entering the confined space 6. Permit Duration Each confined space entry permit will be valid for one work shift, or part thereof, only. On projects requiring more than one shift to complete a project, a new permit shall be completed at the start of each shift prior to entering the confined space. Permits will be numbered consecutively at each project and/or identified by the location if one time entry. Each entry permit will be identified by the project number followed by the number assigned to that permit or location if one time entry. All entry permits will be maintained at the project and filed numerically. Upon completion of the project the permits will be filed in the Safety Department at the corporate office. Each confined space entry permit will be completed in ink and protected from adverse conditions. The completed permit must be conspicuously displayed near the point of entry in to the confined space. It will be the primary responsibility of the Supervisor initiating the permit to ensure compliance to all safety requirements for the duration of the work within the confined space. Any confined space will be tested prior to each entry for combustible atmosphere, oxygen content, and toxic chemical concentrations. The confined space will be entered only if the atmospheric conditions meet the following criteria: • Combustibility <10%LEL • Oxygen Concentration <19.5—22% • Toxic Concentration <PELs Once personnel enter the area, monitoring will be conducted continuously. Special Instructions The confined space entry permit becomes void if any of the following event/conditions occur: • The work is interrupted for more than 60 minutes, for any reason. • An employee becomes ill or injured while working within confined space. • A power failure occurs and the lighting or telephone is inoperative.