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Flatiron Sand and Gravel has operated a large gravel mining <br /> operation along Boulder Creek east of Boulder for more than <br /> 6 years. Monitoring of TSP concentrations and dustfall at <br /> that location have been carried out continuously since <br /> mining began. Results have shown that standards are seldom <br /> if ever exceeded, and impacts beyond site boundaries are not <br /> significantly greater than those due to natural background. <br /> At the White Rocks site, prevailing winds have been from <br /> southwest through northwest, with a secondary frequency <br /> from east and southeast. Dustfall has been measured at <br /> 7 locations surrounding the site, with several stations <br /> directly downwind of operations (to the east and north- <br /> northwest) and one along the access road. Three monitoring <br /> stations have been operated, one of them directly east of <br /> mining activities, for suspended particulates . (Because of <br /> the different setting with respect to the front range <br /> mountains and creek valleys where air drainage occurs, wind <br /> directions are not necessarily the same at the Deepe Farm <br /> site. ) <br /> The annual suspended particulate concentrations at the 3 <br /> • hi-vol sampler sites at Boulder Creek have ranged from <br /> 30 to 50 ug/m3. Thus, mean particulate levels have been <br /> essentially background, despite mining and reclamation <br /> G-16 <br />