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Hot Dip Galvanizing 
October 1994

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 from the TNRCC.  BACT is
defined as any control method which is technically feasible and economically reasonable.                                                    
This BACT determination is made on a case-by-case basis.  The applicant is encouraged to talk
with a TNRCC NSR Permit Engineer to determine the BACT for your facility.  Current
BACT practices are:
1.  Use of a well designed hood to capture emissions from the zinc kettles.
2.  All zinc kettle emissions exhausted to a filter system having a minimum collection
efficiency  of 99%.
3.  Use of a fume suppressant on acid pickle tanks.

These levels are guidelines to help the applicant get an idea of what the TNRCC is currently
considering as BACT; however these control levels are subject to change.
Part D of Section VI of Form PI-1 requires the applicant to submit a BACT analysis.  Any
BACT proposal that is different from the requirements stated above needs to be explained in
detail.  Any control system alternative evaluated should be well designed and engineered for its