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Health&Safety Plan �.. 0 Page 8 of 17 Monitoring shall be conducted: * When work begins on a different portion of the site. * When contaminants other than those previously identified are being handled. * When a different type of operation is initiated. * If a sufficient reasonable interval has passed so that exposures may have significantly increased. Measurements shall be taken at the anticipated source and in the breathing zone of site personnel. Instruments shall only be used by employees who have been trained in the proper operation, use limitation, and calibration of the monitoring instrument and who have demonstrated the skills necessary to operate the instrument. 6.1.2 Perimeter Monitoring Monitoring shall be conducted at least two times each day, with a total volatile organics direct-reading instrument, at location upwind and downwind at the perimeter of the site. Measurements shall also be taken periodically downwind of each active sampling site to assess the potential for off-site migration. If airborne levels of contamination exceed background levels for a sustained period of time at the perimeter of the site, the work area shall be expanded to encompass all area subjected to the elevated levels. If airborne levels of contaminants exceed background levels by 5 ppm at the perimeter of the site, the work will be stopped, the suspected source of the contamination (borehole or production well)will be covered to eliminate emissions. If airborne levels of contaminants exceed background levels,a decision will then be made as to how to proceed with the work and how to more fully characterize the airborne emissions. 6.2.2 Field hnstruments Two types of PID vapor analyzers are available for on-site screening during field operations:hNu Model PI 101 and/or Thermo Environmental Instruments 580A or 580B. The Gastech Flammable Gas Detector shall be used to measure explosion/oxygen levels. Equivalent instruments may be used. Calibration of instruments will be performed prior to field use on a daily basis. Calibration methods as specified in manufachrers-supplied manuals for each instrument will be followed. A two-point calibration is performed on portable gas analyzers using hydrocarbon-free air as the zero point and a manufactured calibration gas as the high point. A gas- analyzed instrument is considered to be accurate if readings of the standards are within 20 percent of the actual concentration of standard gas. 6.2.3 Record Keeping Requirements The result of air monitoring readings shall be recorded on standard air monitoring data forms. A calibration and maintenance log for each instrument shall also be maintained Records shall also be kept of all significant events, addendum's,or changes to level of protection. 6.3 Heat Stress Monitoring Ambient temperatures at the site combined with the requirements for PPE use may contribute to heat stress. When ambient temperatures reach or exceed 70 degrees Fahrenheit,body temperatures will be monitored using fever strips or oral thermometers and heart rates will be monitored when heat stress conditions may occur. Work-rest regimens will be adjusted accordingly.(see Section 3.6) 7.0 SITE CONTROL A check-in and checkout system will be used to control and record each employee and piece of equipment inside the site boundaries. Only personnel identified as"authorized"will be permitted to enter the site.A Master list of authorized personnel will be available and will only include personnel who have received the appropriate training and certification required by this Health and Safety Plan and OSHA requirements. 7.1 Work Zones