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Health and Safety Plan Page 12 The monitoring program may be increased, reduced, or modified by the SSHO, based on site conditions and monitoring results. All monitoring will be accomplished under the direction of the SSHO, who will interpret the results. The air monitoring program will include sufficient monitoring of air quality in work zones and other on-site areas to assess levels of employee exposure, determine that the work zone designations are valid, and verify that the respiratory protection being worn by personnel is adequate. The air monitoring program is also designed to ensure that contaminants are not migrating off site to minimize exposure of nearby populations and/or workers. Air monitoring shall be conducted at 15 minute intervals, unless it is determined that air monitoring may occur at less frequent intervals. These less frequent intervals would be the result of ambient air movement (wind), or through the reduction of the air threat through verification monitoring. Such changes to plan will be logged. 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 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.