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<br /> <br />12.4.7.1 Monthly 60-minute air samples, representative of <br />potential employee exposure, shall be collected <br />at process and storage locations, as appropriate, <br />to determine airborne uranium ooncentrations. <br />12.4.7.2 These samples shall be supplemented by worker <br />breathing cane samplings at least monthly to <br />determine the representativeness of the station <br />air samples. <br />12.4.7.3 Abnthly sampling at selected process areas shall <br />be performed to determine radon daughter <br />concentrations. If monthly values exceed 25 <br />percent of the applicable standards, the <br />Frequency of sampling at these locations shall be <br />increased to. weekly. <br />12.4.7.4 If the air sampling program reveals work <br />locations where concentrations exceed 25 percent <br />of the applicable standards, the licensee shall <br />establish a program to determine time-weighted <br />exposures of employees working at these locations <br />and establish procedures required to maintain <br />employee exposures as low as reasonably <br />achievable. This program shall include <br />time-weighted studies which shall be done at <br />least annually. <br />12.4.7.5 Uranium particulate air sampling, supplementing <br />the routine air sampling program, shall be <br />conducted for cleanup and maintenance activities <br />in process areas, as appropriate. <br />12.4.7.6 The required in-plant airborne monitoring, shall <br />be performed under conditions typical of employee <br />exposures. Along with results of airborne <br />activity, a record of the state of operation of <br />both process and effluent control equipment and <br />ventilation conditions shall be kept. <br />12,.4.8 ALPHA COfTPAMINATION ~ LII~ <br />12.4.8.1 An alpha radiation survey meter shall be <br />available at the exit of the licensed facilities <br />change room. In addition, the licensee shall <br />perform documented spot surveys for alpha <br />contamination at least quarterly on workers <br />leaving the licensed facilities. Alpha <br />VII -18- <br />