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❑ Assemble work group and discuss zone delineation, present conditions, <br /> levels of protection, responsibilities, access points, decontamination <br /> procedures, and emergency site egress point(s) <br /> ❑ Don the specified level of protection before entering the site and complete <br /> the entire decontamination process before exiting <br /> 6.2 Monitoring Procedures <br /> Air monitoring equipment will be used to measure airborne levels of organic vapors <br /> during sampling activities at the site Monitoring will be used to confirm that the proper <br /> level of protection is being used Monitoring will be conducted using an organic vapor <br /> analyzer (OVA) consisting of a photoionization device (PID) or flame ionization device <br />' (FID) Based on the available information on vapor components potentially present at the <br /> site and the results of the initial OVA readings, the HSO will determine if additional <br /> monitoring equipment is required <br /> lie The OVA will be calibrated in accordance with the manufacturer's instructions before <br /> each day's activities, and a calibration check will be conducted on the instrument at the <br />' end of each work day Calibration will be documented in the field log <br />' At the beginning of each work day, background readings will be obtained at an upwind <br /> location OVA readings will be measured in the breathing zone when site work is <br /> initiated The breathing zone will be monitored at 30- to 60-minute intervals or more <br /> frequently if OVA readings are elevated The OVA will be held approximately 36 inches <br /> above the sample area for breathing zone readings if OVA measurements confirm the <br /> presence of organic vapors at sustained concentrations greater than 10 parts per million <br /> (ppm) above background, field personnel wearing modified Level D PPE will be instructed <br />' to move to an upwind location Instrument spikes exceeding the action level do not <br /> necessitate an upgrade if the concentrations diminish below 10 ppm, work may <br /> continue <br /> However, if concentrations in the field personnel breathing zone are sustained above 10 <br /> ppm, appropriate air-purifying respirators will be worn If field team members are already <br /> in Level C PPE, OVA readings will be used to check that the appropriate level of <br />' S\BFS\STOCKTON\HSP001] 10/15/99 6-2 <br />