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VVZI <br /> • Initial Site Entry Procedures <br /> Leve!D PPF and as outlined below Air monitoring with portable photoionization detector <br /> (OVM) <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 <br /> this same upwind, off-site, uncontaminated area <br /> The SSO shall record the Instrument calibration procedures and results and all <br /> background 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) on-site where gas and vapor <br /> contamination is present <br /> Based on these initial air monitoring readings, the SSO shall establish discrete work <br /> zones as follows <br /> Appendix II <br /> Page 9 <br />