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Health and Safety Plan 14 Sears,5110 Pacific Avenue, Stockton, California October 22, 1999 ' 1 Table 5 Air Monitoring Frequency Guidelines ' Conduct periodic monitoring when 1 It is possible that an immediately dangerous to life or health (IDLH) condition or a flammable ' atmosphere has developed, or 2 There is an indication that exposures may have risen over permissible exposure limits or published exposure levels since the last monitoring Look for a possible rise in exposures ' associated with these situations ■ Change in site area - work begins on a different section of the site, ' ■ Change in contaminants - handling contaminants other than those first identified, ■ Visible signs of particulate exposure from intrusive activities such as drilling/boring ' and excavation, ■ Perceptible chemical odors or symptoms of exposure, ' ■ Change in on-site activity - one operation ends and another begins, ■ Handling leaking drums or containers, and ■ Working with obvious liquid contamination (e g , a spill or lagoon) Conduct air monitoring when the possibility of volatilization exists (such as with a new monitoring well or a well containing known product) Conduct air monitoring on a well at a site known to have little contamination (documented by experience or laboratory data), only if an odor emanates from the well 32 CSE Procedures ' Site work may require personnel to enter confined spaces No IT Corporation employee or subcontractor shall enter an area identified as a confined space without using the CSE procedures described in Appendix D and the site-specific entry procedures presented in Appendix D The purpose of the CSE procedure is to protect employees from potentially hazardous environments and to facilitate immediate rescue in an emergency situation A CSE Permit must be posted at the entrance to each confined space