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Air movers or other engineering controls that exhaust or dilute solvent vapors emanating from <br /> monitoring wells or present when conducting intrusive activities can be used to downgrade PPE <br /> requirements. <br /> 7.1.1 Air Monitoring Frequency Guidelines <br /> Conduct periodic monitoring when: <br /> • It is possible that an immediately dangerous to life or health (IDLH) condition or a flammable <br /> atmosphere has developed, or <br /> • There is an indication that exposures may have risen over established action levels, permissible <br /> exposure limits, or published exposure levels since the last monitoring. Look for a possible rise in <br /> exposures associated with these situations: <br /> — Change in site area-work begins on a different section of the site. <br /> — Change in contaminants—handling contaminants other than those first identified. <br /> — Visible signs of particulate exposure from intrusive activities such as drilling/boring <br /> and excavation. <br /> — Perceptible chemical odors or symptoms of exposure. <br /> — Change in on-site activity—one operation ends and another begins. <br /> — Handling leaking drums or containers. <br /> — Working with obvious liquid contamination (e.g., a spill or lagoon). <br /> — Well abandonment or well modification (e.g., cutting, welding) <br /> — When the possibility of volatilization exists (such as with new monitoring well or a <br /> well containing known product). <br /> 7.2 PPE <br /> The minimum level of PPE should be selected according to the hazards that may be encountered during <br /> site activities. Only PPE that meets the following American National Standards Institute (ANSI) or ASTM <br /> standards are to be worn. At a minimum, all workers will wear the following protection while working <br /> on the site: <br /> Eye protection -ANSI Z87.1-1989. <br /> 7-2 <br />