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• • <br /> Santa Fe Pacific Pipeline Partners, L.P. J-6075.03 <br /> Stockton Terminal HEALTH & SAFETY PLAN January 1994 <br /> 5.0 EXPOSURE MONITORING AND ACTION LEVELS (cont.) <br /> H-Nu Monitoring * Protective Measures <br /> Greater than 50 ppm Ventilate drillsite and stop work until <br /> concentrations decrease below 50 ppm. <br /> Calibration: The H-Nu PI-101 will be calibrated to <br /> isobutylene as a benzene standard. <br /> * Concentration in ambient air measured in breathing zone. <br /> L�02 Monitoring- Protective Measures <br /> 0 to 5 % LEL None. <br /> 5 to 10 % LEL Increase monitoring frequency. <br /> 10 to 20 % LEL Ventilate drillsite. <br /> > 10 % LEL Ventilate drillsite; stop work until % <br /> LEL drops below 10. <br /> Calibration: The LEL/02 meter will be calibrated to <br /> ambient air offsite. <br /> • Concentration measured in ambient air. <br /> Detector Tube Monitoring Protective Measures <br /> No Detection No respirator required. <br /> 0 - 1 ppm APR w / combination cartridge. <br /> 1 -5 ppm APR w / combination cartridge; <br /> contact Project H&S Manager. <br /> Page 6 <br />