MARIPOSA COUNTY AIR POLLUTION CONTROL DISTRICT
HEXAVALENT CHROMIUM TOXIC CONTROL MEASURE CHROME PLATING
AND CHROMIC ACID ANODIZING OPERATIONS
A. DEFINITIONS: The following definitions shall apply for the purposes of this rule:
AMPERE-HOURS: The integral of electric current applied to a plating tank (amperes) over a period of time (hours).
ANTI-MIST ADDITIVES: A chemical which reduces the emission rate from the tank when added to and maintained in the plating tank.
CHROME: Metallic chrome.
CHROME PLATING: Either hard or decorative.
CHROMIC ACID: An aqueous solution of chromium trioxide (CrO3) or a commercial solution containing chromic acid (H2CrO4), dichromic acid (H2Cr2O7) or trichromic acid (H2Cr3O10).
CHROMIC ACID ANODIZING: The electrolytic process by which a metal surface is converted to an oxide surface coating in a solution containing chromic acid.
CHROMIUM: HEXAVALENT chromium (Cr+6).
CONTROL EQUIPMENT: Any device which reduces emissions from the emissions collection system.
DECORATIVE CHROME PLATING: The process by which chromium is electrodeposited from a solution containing compounds of chromium onto an object resulting in a chrome later 1 micron (0.04 mil) thick or less.
EMISSION FACTOR: The mass of chromium emitted during a test conducted in the emissions collection system in accordance with Air Resources Board Test Method 425 divided by the ampere-hours consumed by the tanks in the tested emissions collection system expressed as the mass of chromium emitted per ampere-hours of electrical current consumed.
EMISSIONS COLLECTION SYSTEM: A device or apparatus used to gather chromium emissions from the surface of a chrome plating or chromic acid anodizing tank or tanks.
FACILITY: A business or businesses engaged in chrome plating or chromic acid anodizing which are owned or operated by the same person or persons and are located on the same parcel or on contiguous parcels.
FACILITYWIDE EMISSIONS FROM HARD CHROME PLATING OR CHROMIC ACID ANODIZING: The total emissions from all hard chrome plating or chromic acid anodizing at the facility over a calendar year. Emissions shall be calculated as the sum of emissions from the emissions collection system at the facility. The emissions from an emissions collection system shall by calculated by multiplying the emission factor for that emissions collection system by the sum of ampere-hours consumed during that year for all of the tanks served by the emissions collection system.
HARD CHROME PLATING: The process by which chromium is electrodeposited from a solution containing compounds of chromium onto an object resulting in a chrome layer thicker than 1 micron (0.04 mil).
PLATING TANK: Any container used to hold a chromium of chromic acid solution for the purposes of chrome plating or chromic acid anodizing.
UNCONTROLLED CHROMIUM EMISSIONS FROM THE HARD CHROME PLATING OR CHROMIC ACID ANODIZING FACILITY: The Chromium emission from the emissions collection system at the facility calculated as if no control equipment is in use. For the purpose of determining compliance with this rule the uncontrolled chromium emissions shall by calculated using an emission factor based on tests conducted in accordance with Air Resources Board Test Method 425 or 14 mg/ampere-hours whichever is less.
B. REQUIREMENTS FOR DECORATIVE CHROME PLATING FACILITIES
C. REQUIREMENT FOR HARD CHROME PLATING AND CHROMIC ACID ANODIZING FACILITIES.
D. COMPLIANCE SCHEDULE - DECORATIVE CHROME PLATING, HARD CHROME PLATING, AND CHROMIC ACID ANODIZING FACILITIES