Hexavalent Chromium ATCM for Decorative and Hard Chrome

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Effective Date: October 24, 2007constitute a nuisance pursuant to section 41700 of theCalifornia Health and Safety Code, with the burden of provingthe criteria of this section placed upon the person seeking tocome under the provisions of this law.(9) “Chemical fume suppressant” means any chemical agent thatreduces or suppresses fumes or mists at the surface of anelectroplating or anodizing bath; another term for fumesuppressant is mist suppressant.(10) “Chromic acid” means the common name for chromiumanhydride (CrO3).(11) “Chromic acid anodizing” means the electrolytic process bywhich an oxide layer is produced on the surface of a basematerial for functional purposes (e.g., corrosion resistance orelectrical insulation) using a chromic acid solution. In chromicacid anodizing, the part to be anodized acts as the anode inthe electrical circuit, and the chromic acid solution, with aconcentration typically ranging from 50 to 100 grams per liter(g/L), serves as the electrolyte.(12) “Chromium electroplating or chromic acid anodizing tank”means the receptacle or container in which hard or decorativechromium electroplating or chromic acid anodizing occurs,along with the following accompanying internal and externaltank components needed for chromium electroplating orchromic acid anodizing. These tank components include, butare not limited to, rectifiers fitted with controls to allow forvoltage adjustments, heat exchanger equipment, andcirculation pumps.(13) “Composite mesh-pad system” means an add-on air pollutioncontrol device typically consisting of several mesh-pad stagesto remove particles.(14) “Decorative chromium electroplating” means the process bywhich a thin layer of chromium (typically 0.003 to2.5 micrometers) is electrodeposited on a base metal, plastic,or undercoating material to provide a bright surface with wearand tarnish resistance. In this process, the part(s) serves asthe cathode in the electrolytic cell and the solution serves asthe electrolyte. Typical current density applied during thisprocess ranges from 540 to 2,400 Amperes per square meter(A/m 2 ) for total plating times ranging between 0.5 to 5 minutes.4
Effective Date: October 24, 2007(15) “Dragout” means fluid containing hexavalent chromium thatadheres to parts when they are removed from a tank.(16) “Electroplating or anodizing bath” means the electrolyticsolution used as the conducting medium in which the flow ofcurrent is accompanied by movement of metal ions for thepurpose of electroplating metal out of the solution onto aworkpiece or for oxidizing the base material.(17) “Emission limitation” means, for trivalent chromium plating, theconcentration of total chromium allowed to be emittedexpressed in milligrams per dry standard cubic meter(mg/dscm). For hexavalent chromium plating or anodizing, theallowable surface tension expressed in dynes per centimeter(dynes/cm) or the milligrams of hexavalent chromium perampere-hour (mg/amp-hr) of electrical charge applied to thechromium electroplating or anodizing tank, or theconcentration of chromium allowed to be emitted expressed inmilligrams per dry standard cubic meter (mg/dscm).(18) “Enclosed hexavalent chromium electroplating tank” means ahard, decorative or chromic acid anodizing tank using ahexavalent chromium solution that is equipped with anenclosing hood and ventilated at half the rate or less than thatof a ventilated open surface tank of the same surface area.(19) “Enclosed storage area” means any space or structure used tocontain material that prevents its contents from being emittedinto the atmosphere. This includes cabinets, closets or shedsdesignated for storage.(20) “Executive Officer” means the Executive Officer of the AirResources Board, or his or her delegate.(21) "Existing facility" means a facility that is in operation beforeOctober 24, 2007.(22) “Facility” means the major or area source at which chromiumelectroplating or chromic acid anodizing is performed and/orany source or group of sources or other contaminant-emittingactivities which are located on one or more contiguousproperties within the District, in actual physical contact orseparated solely by a public roadway or other publicright-of way, and are owned or operated by the same person(or by persons under common control), or an outer continental5
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Hexavalent Chromium ATCM for Decorative and Hard Chrome

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