Tanner operates a Sand and Gravel processing facility located in Glendale, Arizona. This EPA Administrative Penalty Action issued under 113(d) of the Clean Air Act is for PM10/dust violations of Maricopa County SIP Rule 316, Sections 301.2(a),(b), & (c)(3) and 502.3(c)relating to penalties for operating shaker screens without required enclosure on all sides and for required permanent mounting/operation of appropriate watering to control fugitive dust.