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eh <br />ESPEY, HUSTON &ASSOCIATES, INC. <br /> <br />flow at the level of the mining activity.. Based on a compromise between physical <br />accessibility, land than can be legally accessed, and monitoring wind flow which <br />indicates best where pazticulate from the mining activity is transported, the <br />meteorological site should be located on a relatively flat area that is 0.4 mile west <br />of the Northern No. 1 (FF-Seam) loadout and 0.2 mile east of State Highway 13/789. <br />The elevation at this location is approximately 7,300 feet AMSL, placing the <br />meteorological station well above the valley floor and within 0.2 mile of either <br />State Highway 13/789 or the road that will access the proposed refuse disposal azea <br />and the sedimentation pond site. <br />Two collocated high volume (hi vol) pazticulate samplers should be <br />placed in the immediate vicinity of the meteorological station in compliance with <br />quality assurance guidelines for ambient air monitoring outlined in the May 10, 1979, <br />edition of the Federal Retzister. The collocated hi vola should provide an indication <br />• of maximum pazticulate emissions from the combined mining activities within the <br />diaturbed azea. <br />Two other hi vole, one located upwind of the mining operations and one <br />located downwind, should be installed so that the air quality impact of the mining <br />activities can be determined at some significant distance from the actual mining <br />operation sites. Again, physical accessibility and legal access to the hi vol sites will <br />dictate the final choice of these upwind and downwind locations. <br />Based on wind data from an existing Northern Coal meteorological <br />station, the prevalent wind flow throughout the immediate valley configuration is <br />either from the north or south directions. Thus, the best upwind and downwind <br />locations are north of the disturbed azea and south of the disturbed azea. Neither hi <br />vol should be located at the same elevation as State Highway 13/789 because of <br />entrainment from highway traffic. A site away from the road should be chosen that <br />allows legal access and is at approximately the same elevation as the mining <br />operations. Based on these considerations, the south hi vol should be located neaz <br /> <br />N-4 <br />