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Z1 INC <br /> If Level C PPE is required for initial site entry, then all personnel MUST carry a 5 minute escape <br /> air bottle <br /> Initial Site Entry Procedures <br /> Level D PPE and as outlined below Air monitoring with portable photoronization detector <br /> (O VM) <br /> Prior to entering the site, the SSO shall calibrate the portable direct-reading air monitoring <br /> instruments upwind from site in an uncontaminated area <br /> I <br /> The SSO shall then determine background readings for all air monitoring instruments in this <br /> same upwind, off-site, uncontaminated area <br /> The SSO shall record the instrument calibration procedures and results and all background <br /> readings in the Site Safety Log Book <br /> I <br /> All personnel must enter the site from an upwind position if possible <br /> C. Work Zones <br /> At the beginning of each work shift the WZI SSO shall perform initial air monitoring with <br /> portable direct-reading instruments to identify the area(s) onsite where gas and vapor <br /> contamination is present <br /> Based on these initial air monitoring readings, the SSO shall establish discrete work zones as <br /> follows <br /> 4908220010 011 APPENDIX 1 <br /> 9 <br />