Rock Crushing Facilities TNRCC Rule 116.111(3) in Regulation VI requires that Best Available Control Technology (BACT) be applied to all facilities that must obtain a permit. BACT is defined as any control method which is technically feasible and economically reasonable. BACT determinations are made on a case-by-case basis. The applicant is encourage to talk with a TNRCC NSR Permit Engineer to determine the BACT for the facility. Current control practices include: 1. At least seventy percent control of fugitive dust emissions from the crushing, conveying and stockpiling of aggregate material (sufficient application of water by sprays or fog rains). 2. At least ninety-five percent control of fugitive dust emissions from all vibrating screens (sufficient water application to create saturated conditions with no visible emissions. 3. At least seventy percent control of fugitive dust emissions from roads and traffic areas (watering, wet or dry sweeping acceptable). The control requirements listed are guidelines to help the applicant determine what the TNRCC is currently considering as BACT; however these control levels are subject to change.