Municipal Waste Combustors March 1995 Technical Disclaimer References to abatement technologies are not intended to represent minimum or maximum levels of Best Available Control Technology (BACT). Determinations of BACT are made on a case by case basis. BACT determinations are always subject to adjustment in consideration of specific process requirements, air quality concerns and recent developments in abatement technology. Additionally, specific health effect concerns may indicate stricter abatement than required by the BACT determination. The represented calculation methods are intended as an aid in the completion of acceptable permit applications; alternative calculation methods may be equally acceptable if they are based upon, and adequately demonstrate, sound engineering assumptions or data. These guidelines are applicable as of the date of this document, but are subject to revision during the permit application preparation and review period. It is the responsibility of the applicants to remain abreast of any guideline or regulation developments which may affect their industries. TNRCC Rule 116.111(3) in Regulation VI requires that BACT be applied to all facilities that must obtain a permit. Current BACT guidelines for municipal waste combustors: Carbon Monoxide (CO) 50 ppmdv corrected to seven percent oxygen (O2) Hydrogen Chloride (HCl) Ninety-five percent reduction, weight or volume, or 25 ppmdv corrected to seven percent O2, whichever is less stringent. Opacity Five percent Particulate Matter (PM) 0.015 grains per dry standard cubic foot (gr/dscf) corrected to seven percent O2 dry. Front-half only; 0.020 gr/dscf corrected to seven percent O2, front and back half Sulfur Dioxide (SO2) Eighty percent reduction, weight or volume, or thirty ppmdv corrected to seven percent O2, whichever is less stringent. Operating Standards Secondary Chamber - minimum 1800F and one to two seconds retention time. Compliance and Performance Testing Annual stack sampling for: PM, dioxins/furans, HCl, trace metals - antimony, arsenic, barium, beryllium, cadmium, chromium, iron, lead, mercury, manganese, nickel, selenium, silver, titanium, vanadium and zinc. Continuous Emissions Monitoring Systems (CEMS) CO, opacity, O2 (possibly NOx and SO2) These levels are guidelines to help the applicant get an idea of what the TNRCC currently considers BACT. Please call and talk to a combustion section permit engineer at 512-239-1250 to discuss the specifics of your project.