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C <br /> Initial Site Entry Pro edures: <br /> Level D PPE and as outlined below. Air monitorinq 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 readir gs for all air monitoring instruments in <br /> this same upwind, off-site, uncontaminated area. <br /> The SSO shall record the instrument calibrat on 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 /> i <br /> C. Work Zones <br /> I <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 S O shall establish discrete work zones <br /> i <br /> as follows: <br /> i <br /> 9 <br />