Concrete Batch Plants

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 BACT for the facility. 
Current control practices include:  

1.  All dry material storage silos equipped with fabric filter
    baghouses having a maximum outlet grain loading of 0.01
    grains per dry standard cubic foot (gr/dscf).
2.  All storage silos equipped with audible or visual warning
    devices to prevent overloading.  
3.  All aggregate material washed prior to delivery.
4.  At least seventy percent control of fugitive dust
    emissions from the stockpiling and handling of aggregate
    material (sufficient application of water by sprays or fog
    rings).
5.  At least ninety-five percent control of fugitive dust
    emissions from the weigh hopper and truck drop point
    (usually achieved by a baghouse and suction shroud).  
6.  At least ninety-five percent control of fugitive dust
    emission from roads and traffic areas (paving and 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.