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5.0 AIR MONITORING Required Equipment: ® OVA-FID/PID ❑ Explosimeter ❑ Oz Meter ❑ SO2 Meter ❑ Noise Meter ❑ Radiation Meter ❑ Personal Air Sampling Air monitoring will be performed during drilling activities utilizing a field operated organic vapor analyzer(OVA)-flame ionization detector(FID) and/or photoionization detector(PID) and/or explosimeter. The OVA shall be used in assessing appropriate health and safety protection levels within the Exclusion Zone. "Background" levels of volatile organics in air shall be monitored with the OVA in areas away from the influence of possible vapor/gas releases from the site activities. Consistent readings exceeding 5 ppm above background for the OVA in the workers' breathing zone shall initiate suspension or modification of operations until the appropriate PPE requirements can be implemented by the SSO. Readings exceeding 1,000 %/ppm at the borehead/excavation shall initiate temporary suspension of the activities until the conditions can be further assessed. If corrective action cannot be taken, field personnel and other individuals in the area must be directed to move to a safe area. The SSO and Project Manager must also be contacted. The SSO shall be responsible for determining whether additional exposure monitoring/sampling is needed to supplement the equipment and methods described above. The SSO shall also monitor that the instruments described above are operated and interpreted only by persons who have had prior training and experience in their operation, calibration and care, and who understand their limitations. He/She shall also monitor that the instruments are being properly calibrated, and that the calibration and proper operation of the instruments are checked and documented periodically. The OVA shall be calibrated both before and after field operations or as deemed necessary during field operations. The instruments will be calibrated directly to the type calibration gas used by the equipment manufacturer. The calibration gas and the calibration readings (in ppm equivalent) shall be recorded in the field log book. It should be noted that the OVA-FID hydrogen flame can extinguish in low oxygen environments. In addition, high humidity environments can cause an OVA-PID instrument to indicate lower organic vapor concentrations than actually exist. The SSO shall be responsible for interpreting monitoring data and upgrading or downgrading the level of protection during field activities. Project No.S8475-06-70 -16- April 25,2003