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R n Health and Safety Plan 12 The Southland Corp-Store located at 1399 N Main St ,Manteca, CA September 19, 1996 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 nse in exposures associated with these situations a 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 activtties 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) I ' 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 Fluor Daniel GTI 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 FLUOR DANIEL GTI 90