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' 1 INC <br /> If Level C PPE is required for initial site entry, then all personnel MUST cavy a 5 minute escape <br /> ' air bottle <br /> ' Initial Site Entry Procedures <br /> Level D PPE and as outlined below Air monitoring with portable photoionization detector <br /> (0 VM) <br /> I 1 <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 /> 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 /> ' 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 monitoringreadings, the SSO shall establish discrete 9 , t work zones as <br /> ' follows <br /> APPENDIX I <br /> • 9 <br /> ' 08220010 005 <br />