EL DORADO COUNTY AIR QUALITY MANAGEMENT DISTRICT

RULE 920 - DEFINITIONS
(Adopted November 20, 1989)

For the purpose of this section the following definitions shall apply:

Adoption Date:
For this rule shall means the date the El Dorado County Air Pollution Board of Directors adopt this regulation.
 
Ampere-Hours:
Means the integral of electrical current applied to a plating tank (amperes) over a period of time (hours).
 
Anti-Mist Additive:
Means a chemical which reduces the emission rate from the tank when added to and maintained in the plating tank.
 
A.P.C.D.:
El Dorado County Air Pollution Control District.
 
A.P.C.O.:
El Dorado County Air Pollution Control Officer.
 
A.R.B.:
Air Resources Board of California.
 
Authority to Construct Form:
An application provided by the A.P.C.D. which is required and must be submitted for each article, machine, equipment or other contrivance requiring a permit.

Chrome:
Means metallic chrome.
 
Chrome Plating:
Means either hard or decorative chrome plating.
 
Chromic Acid:
Means an aqueous solution of chromium trioxide (CrO
3) or a commercial solution containing chromic acid, dichromic acid (H2CrO7) or trichromic acid (H2Cr3O10).
 
Chromic Acid Anodizing:
Means the electrolytic process by which a metal surface is converted to an oxide surface coating in a solution containing chromic acid.
 
Chromium:
Means hexavalent chromium.
 
Control Equipment:
Means any device which reduces emissions from the emissions collection system.
 
Decorative Chrome Plating:
Means the process by which chromium is electrodeposited from a solution containing compounds of chromium onto an object resulting in a chrome layer 1 micron (0.04 mil.) thick or less.
 
Emission Factor:
Means the mass of chromium emitted during a test conducted in the emissions collection system in accordance with ARB 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-hour of electrical current consumed.
 
Emissions Collection System:
Means a device or apparatus used to gather chromium emissions from the surface of a chrome plating or chromic acid anodizing tank or tanks.

Facility:
Means 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:
Means 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 be 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:
Means 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:
Means any container used to hold a chromium or 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:
Means the chromium emissions from the emissions collection systems 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 be calculated using an emission factor based on tests conducted in accordance with ARB Test Method 425 or 14 mg/ampere-hour whichever is less.