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X X: <br /> f <br /> i•. .j � x - k Y, "3 �e.pf °'�sga v � Vh �-. :� <br /> m <br /> LAMMERSVILLE SCHOOL DISTRICT <br /> Site Safety' Pian <br /> October 16, 1991 <br /> b, Explosive Vapors: Monitor for of Lower Explosive Limit (LEL) <br /> with a 02/LEL Meter to determine whether vapor concentrations <br /> within the confined space exceed 20% of the LEL. If readings <br /> exceed 20% LEL, personnel shall shut off accessible equipment, <br /> leave the site immediately, and contact the fire department. <br /> C. Toxic Vapors: Monitor the air within the confined space for <br /> organic vapors with a PID or FID following guidelines stated in <br /> Section 8.0 (above) to decide on the respiratory protection <br /> needed. Enter the space only if the oxygen level is at or <br /> above 19.5%, the %LEL is below 20%, the toxic vapor <br /> concentration is determined, and the proper respiratory <br /> protection is worn. <br /> PID or FID readings will be taken at the top, middle and bottom <br /> of a vault, shed, or other confined space to ensure that vapors <br /> do not exceed acceptable levels. <br /> All monitoring equipment must be calibrated and maintained in <br /> accordance with manufacturer's recommendations. Instruments should be <br /> calibrated, or the calibration checked (on instruments which cannot be <br /> field calibrated) at the beginning of each work shift, or whenever <br /> there is reason to suspect the performance of the instrument (e.g., <br /> when inconsistent or erratic readings are obtained) . The results of <br /> the calibration or calibration check should be recorded on the Daily <br /> Instrument Calibration Check Sheet in Appendix G. All air monitoring <br /> data must be recorded on the Vapor Monitoring sheet, Appendix H. <br /> Completed forms should be returned to the District Health & Safety <br /> Coordinator at the conclusion of the project. <br /> 19 <br />