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Chevron U.S.A. Ins . Site Safety Plan ., October 2, 1991 W b. Explosive Vagorc: Monitor for % of Lower Explosive Limit (LEL) with a 0 /LEL Meter to determine whether vapor concentrations within tie confined space exceed 20% of the LEL. If readings exceed 20% LEL, personnel shall shut off accessible equipment, leave the site immediately, and contact the fire department. C. Toxic Vapors: Monitor the air within the confined space for organic vapors with a PID or FID following guidelines otated in Section 8.0 (above) to decide on the respiratory protection needed. Enter the space only if the oxygen level is at or above 19.5%, the %LEL is below 20%, the toxic vapor concentration is determined, and the proper respiratory protection is worn. PID or FID readings will be taken at the top, middle and bottom of a vault, shed, or other confined space to ensure that vapors do not exceed acceptable levels. All monitoring equipment must be calibrated and maintained in accordance with manufacturer's recommendations. Instruments should be calibrated, or the calibration checked (on instruments which cannot be field calibrated) at the beginning of each work shift, or whenever there is reason to suspect the performance of the instrument (e.g., when inconsistent or erratic readings are obtained) . The results of the calibration or calibration check should be recorded on the Daily w instrument Calibration Check Sheet in Appendix G. All air monitoring data must be recorded on the Vapor Monitoring Sheet, Appendix M. Completed forms should be returned to the District Health & Safety Coordinator at the conclusion of the project. ,I�i irpfn" I!„i,q i, i�6iuVly9i^, aiIP,iil,i°, !y'y�'61uI1Nl "IS lil° i,l "rlu. PPill Y '''•'..hII''i lfill l4I"'iY„di!iiUiI,IP II IIi".. IIgIIIiii+�'',u7ul�lll!allll�lollii6iii!'^.. °°°. a k° SSE m.�!I!!illl"I lllli.. ...........