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Health and Safety Plan <br />Page 13 <br />If airborne levels of contaminants exceed background levels, a decision <br />will then be made as to how to proceed with the work and how to more fully <br />characterize the airborne emissions. <br />6.2.2 Field Instruments <br />Two types of PID vapor analyzers are available for on-site screening during <br />field operations: hNu Model PI 101 and/or Thermo Environmental Instruments <br />580A or 580B. <br />The Gastech Flammable Gas Detector shall be used to measure <br />explosive/oxygen levels. Equivalent instruments may be used. <br />Calibration of instruments will be performed prior to field use on a daily <br />basis. Calibration methods as specified in manufacturers -supplied manuals <br />for each instrument will be followed. A two-point calibration is <br />performed on portable gas analyzers using hydrocarbon -free air as the zero <br />point and a manufactured calibration gas as the high point. A gas analyzed <br />instrument is considered to be accurate if readings of the standard are <br />within 20 percent of the actual concentration of standard gas. <br />6.2.3 Recordkeeping Requirements <br />The result of air monitoring readings shall be recorded on standard air <br />monitoring data forms. A calibration and maintenance log for each <br />instrument shall also be maintained. Records shall also be kept of all <br />significant events, addendums, or changes to level of protection. <br />6.3 Heat -Stress Monitoring <br />Ambient temperatures at the site combined with the requirements for PPE use <br />may contribute to heat stress. When ambient temperatures reach or exceed <br />70 degrees Fahrenheit, body temperatures will be monitored using fever <br />strips or oral thermometers and heart rates will be monitored when heat <br />stress conditions may occur. Work -rest regimens will be adjusted <br />accordingly (see Section 3.6) <br />7.0 SITE CONTROL <br />A check-in and check-out system will be used to control and record each <br />employee and piece of equipment inside the site boundaries. Only personnel <br />identified as "authorized" will be permitted to enter the site. A Master <br />list of authorized personnel will be available and will only include <br />personnel who have received the appropriate training and certification <br />required by this Health and Safety Plan and OSHA requirements. <br />