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2 10 Air Monitoring <br />A. Particulate Monitoring <br />Continuous air sampling is conducted at three locations for t}~e <br />determination of ambient particulate radionuclide concentration. <br />Two of these locations are onsit.e, Meer the west property boundary <br />(206) and near the northeast property boundary (20S), while the <br />third location is offaite on Pine Ridge Road (204). The reaulta for <br />the environmental particulate sampling at these locations for thn <br />reporting period are provided on the following pages. <br />The collected data from the environmental air sampling locations <br />for the reporting period are consistent with historical patterns <br />and are well below regulatory limitations at less than 1~ MPC. <br />The internal audit committee has expressed concern about the <br />suitability of using "perimeter" air-sampling location 206 as the <br />basis for the site background level for the airborne pathway. The <br />concern is based upon the relatively close proximity of location <br />206 to the primacy ventilation exhaust point for the underground <br />mine workings and the resultant elevation in "background" from <br />material exhausted from the mine. Location 206 was originally <br />chosen as the site background level due to the very high <br />probability that the location was not influenced by the .site <br />licensed facilities and thus could provide comparative information <br />in determining offsite dose assessment to the nearest receptor <br />from the licensed facilities. Relocation of the sample location to <br />avoid the influence of the mine exhaust is under investi~~ation. <br />