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6 <br /> Eguinment <br /> The following types of air-monitoring equipment will be used to obtain real-time <br /> measurements in the work zone during the sampling program. Draeger tubes will be used at a <br /> minimum to monitor for benzene. A photoionization detector(OVM), equipped with a 10 eV <br /> bulb, will be used to monitor for nonspecific VOCs. Air monitoring for VOCs will be <br /> performed at shoulder height (in the breathing zone) on those workers most likely to be <br /> exposed to potential hazardous concentrations of contaminants. <br /> Frequency of Monitoring <br /> Air monitoring will be performed at the beginning of each day,before the startup of any <br /> work tasks, to identify ambient conditions. During'work tasks, periodic monitoring will be <br /> performed at a minimum of once an hour. Additional monitoring will be performed whenever r <br /> work begins at a different location,.when meteorological conditions, such as wind direction or <br /> ambient temperature, demonstrate a sustained and noticeable change, or when vapors from <br /> either drilling or sampling are detected by site workers. <br /> Maintenance and Calibration of Monitoring Equipment <br /> All personnel who will be using monitoring equipment will be thoroughly briefed on <br /> the operation, limitations, and maintenance of these devices. All maintenance and calibration <br /> procedures will be in strict accordance with the manufacturer's guidelines by a designated <br /> individual familiar with the devices. Air-monitoring equipment will be calibrated every <br /> morning before the start of shift. Only routine maintenance (e. g., changing batteries or lamps) <br /> will be performed by staff members. Any additional maintenance will be performed by the <br /> manufacturer. <br /> RecordkeeRing <br /> Daily logs will be kept by the site air monitor for the duration of the job. In the daily <br /> log, the measurement from the monitoring equipment and the type and time of monitoring will <br /> be recorded. <br /> In addition to routine.air monitoring, field screening of the drum samples and'of soil <br /> samples with the PID will be conducted to better understand the degree of hazard associated <br /> with the materials being sampled, excavated, and/or stockpiled. The results of field screening <br /> will be recorded in the same manner as outlined above. <br /> Project No. RCO291.001 <br /> GERAGHTY MILLER. INC. i� <br />