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B. Radon 222 <br />Radon 222 is monitored at the three environmental air sampling <br />locations on a quarterly basis, utilizing Track-Etch Radon 222 <br />detectors. <br />A summary of monitoring results for this reporting perio~j is <br />presented on the following page. <br />An investigation to ascertain tt~e cause, if any, in the infrequent <br />and apparently random exeeedenc•es of the 3.U pCi/L Mk~C n~t location <br />206 will beyin during the third quarter of 1993. Potent.ia] <br />contributing sources and licensed facility operatiana will be <br />investigated. <br />