Hexavalent Chromium ATCM for Decorative and Hard Chrome

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Effective Date: October 24, 2007shelf (OCS) source as determined in 40 CFR Section 55.2, aslast amended September 2, 1997.(23) “Fiber-bed mist eliminator” means an add-on air pollutioncontrol device that removes particles from a gas streamthrough the mechanisms of inertial impaction and Browniandiffusion.(24) “Foam blanket” means the type of chemical fume suppressantthat generates a layer of foam across the surface of a solutionwhen current is applied to that solution. A foam blanket doesnot lower surface tension of a liquid.(25) “Fresh water” means water, such as tap water, that has notbeen previously used in a process operation or, if the waterhas been recycled from a process operation, it has beentreated and meets the effluent guidelines for chromiumwastewater.(26) “Fugitive dust” means any solid particulate matter that maycontain hexavalent chromium that has the potential to becomeairborne by natural or man-made activities. “Fugitive dust”does not include particulate matter emitted from an exhauststack.(27) “Hard chromium electroplating or industrial chromiumelectroplating” means a process by which a thick layer ofchromium (typically greater than 1.0 micrometers) iselectrodeposited on a base material to provide a surface withfunctional properties such as wear resistance, a low coefficientof friction, hardness, and corrosion resistance. In this process,the part serves as the cathode in the electrolytic cell and thesolution serves as the electrolyte. The hard chromiumelectroplating process is performed at current densitiestypically ranging from 1,600 to 6,500 A/m 2 for total platingtimes ranging from 20 minutes to 36 hours depending uponthe desired plate thickness.(28) “Hexavalent chromium” means the form of chromium in avalence state of +6.(29) “High Efficiency Particulate Arrestor (HEPA) filter” meansfilter(s) rated at 99.97 percent or more efficient in collectingparticle sizes 0.3 micrometers.(30) "Initial startup" means the first time a new facility beginsproduction or the first time a modified chromium plating or6
Effective Date: October 24, 2007anodizing tank begins operating at a modified facility. If suchproduction or operation occurs prior to October 24, 2007, thedate of "Initial Startup" is October 24, 2007. "Initial Startup"does not include operation solely for testing of equipment orsubsequent startup of permit units following malfunction orshutdown.(31) “Large, hard chromium electroplating facility” means a facilitythat performs hard chromium electroplating and emits greaterthan or equal to 10 pounds per year (lbs/yr) controlledemissions of hexavalent chromium.(32) “Leak” means the release of chromium emissions from anyopening in the emission collection system prior to exiting theemission control device.(33) “Major source” means any stationary source, or group ofstationary sources located within a contiguous area and undercommon control, that emits, or has the potential to emitconsidering controls, in the aggregate, 10 tons per year ormore of any hazardous air pollutant, or 25 tons per year ormore of any combination of hazardous air pollutants.(34) “Maximum cumulative potential rectifier capacity” means thesummation of the total installed rectifier capacity associatedwith the hard chromium electroplating tanks at a facility,expressed in amperes, multiplied by the maximum potentialoperating schedule of 8,400 hours per year and 0.7, whichassumes that electrodes are energized 70 percent of the totaloperating time. The maximum potential operating schedule isbased on operating 24 hours per day, 7 days per week,50 weeks per year.(35) “Mechanical fume suppressant” means any device, includingbut not limited to polyballs, that reduces fumes or mist at thesurfaces of an electroplating or anodizing bath by directcontact with the surface of the bath.(36) “Medium, hard chromium electroplating facility” means afacility that performs hard chromium electroplating and emitsgreater than 2 pounds per year (lbs/yr) controlled emissionsbut less than 10 pounds per year (lbs/yr) controlled emissionsof hexavalent chromium.7
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Hexavalent Chromium ATCM for Decorative and Hard Chrome

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