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Security fencing will surround the samplers. Measured concentrations at this location will be <br />compared to the National Ambient Air Quality Standard (NAAQS) for PMIo. PM10. Monitoring <br />began in November 2007, and continued though mid-December 2008. <br />The particulate samplers collected an integrated, 24-hour average concentration for the period of <br />midnight-to-midnight Mountain Standard Time (MST). The samplers were placed on sampling <br />stands so that their inlets are located between 3 and 4 meters above ground level and the <br />samplers separated by at least 2 meters to avoid interference for each other. Meteorological <br />parameters were also measured on a single, 10-meter high tower site for a period of one year to <br />establish the dispersion characteristics of the site. Monitoring of meteorological parameters was <br />performed concurrently with the PM 10 monitoring. The monitoring variable was available for use <br />in AERMET processing which can be used in AERMOD dispersion model for characterization <br />of the site activities for permitting the facility. <br />2.4.3 Monitoringof Radionuclides in Air <br />Placement of particulate air samplers considered: (a) site boundary locations which, during <br />operations, may represent "points of compliance" relative to permissible releases of radioactive <br />materials in air to unrestricted (public) areas; (b) directions from project activities representative <br />of prevailing/highest frequency winds; (c) the location of nearby residence(s) which would <br />represent the potentially "maximally exposed offsite individual" from project airborne releases <br />under normal operations and/or accidental releases (Regulatory Guide 4.14, 1980). <br />Five high-volume air sampling stations were installed within the project area, and one was set up <br />off site as the control or background station. Two of the five stations were installed in <br />Centennial North (Platel), and three of the five stations were installed at Centennial South <br />(Plate 2), including one station co-located with the meteorology station and the particulate air <br />samplers. The control station is located West/Northwest (upwind") of the project site, near the <br />intersection of Interstate 25 and Owl Canyon Road, north of Wellington, Colorado. <br />High-volume air sampling pumps, with flow rates greater than ten cubic feet per minute (cfm), <br />were utilized to ensure minimum detection limits for radionuclides were achieved. Units were <br />enclosed in weather resistant housings and consist of Hi-Q Environmental Product 4300 series <br />automatic flow control units. Continuous air sampling was obtained via filter paper collection. <br />Filters were changed weekly or as necessary, based on dust loading. Sampling was conducted <br />continuously for twelve months; quarterly composites from each station were separately <br />April 2009 9 Site Characterization Plan