VENTURA COUNTY AIR POLLUTION CONTROL DISTRICT


Rule 62.2 Hexavalent Chromium - Chrome Plating and Chromic Acid Anodizing

(Adopted 6/27/89)

A. Applicability

This rule applies to the chrome plating and the chromic acid anodizing of metallic and non-metallic parts.

B. Requirements

  1. Decorative chrome plating

    A person shall not operate any decorative chrome plating tank unless one of the following control measures is used in a manner which has been been demonstrated to and approved by the Air Pollution Control Officer (APCO) as reducing chromium emissions by 95 percent or more relative to the uncontrolled chromium emissions:

  2. a. An anti-mist additive is continuously maintained, or;

    b. Control equipment is installed and used.

  3. Hard chrome plating and chromic acid anodizing

  4. a. A person shall not operate any hard chrome plating tank or chromic acid anodizing tank unless the tank has an emissions collection system that meets one of the following requirements:

    1. The chromium emissions from the emissions collection system serving the plating tank must be reduced by at least 95 percent from the uncontrolled chromium emissions, or;

    2. The chromium emissions from the emissions collection system serving the plating tank must be reduced to less than 0.15 milligrams (mg) of chromium per ampere-hour of electrical charge applied to the plating tank.

    b. A person shall not operate any hard chrome plating tank or chromic acid anodizing tank at a stationary source where the sourcewide chromium emissions from hard chrome plating or chromic acid anodizing are greater than 2 pounds per year, but less than 10 pounds per year, unless the tank has an emissions collection system that meets one of the following requirements:

    1. The chromium emissions from the emissions collection system serving the plating tank must be reduced by at least 99 percent from the uncontrolled chromium emissions, or;

    2. The chromium emissions from the emissions collection system serving the plating tank must be reduced to less than 0.03 mg of chromium per ampere-hour of electrical charge applied to the plating tank.

    c. A person shall not operate any hard chrome plating tank or chromic acid anodizing tank at a stationary source where the sourcewide chromium emissions from hard chrome plating or chromic acid anodizing are greater than or equal to 10 pounds per year, unless the tank has an emissions collection system that meets one of the following requirements:

    1. The chromium emissions from the emissions collection system serving the plating tank must be reduced by at least 99.8 percent from the uncontrolled chromium emissions, or;

    2. The chromium emissions from the emissions collection system serving the plating tank must be reduced to less than 0.006 mg of chromium per ampere-hour electrical charge applied to the plating tank.

    d. Compliance shall be verified by source testing every 24 months.

C. Recordkeeping Requirements

A person subject to the provisions of section B of this rule shall meet the following applicable requirements:

  1. A weekly record of anti-mist additive concentrations or any other measurements recommended by the manufacturer's specification and the APCO shall be maintained. Recordkeeping shall begin on the date of final compliance.

  2. A weekly record of current integrated over time (ampere-hours) for all plating tanks used at a chrome plating or chromic acid anodizing stationary source shall be maintained. Current integrated over time shall be continuously monitored. Recordkeeping shall begin on June 27, 1989.

  3. All records including all pertinent information relative to the operation of the plating tanks, all source testing, and all information relative to the emissions collection system and the control equipment shall be maintained for two years and shall be made available to the APCO upon request.

D. Test Methods

Compliance with the chromium emissions requirements in subsection B.2 of this rule shall be determined by ARB Test Method 425.

E. Compliance Schedule

  1. A person subject to the provisions of subsection B.1 shall be in final compliance with the requirements of subsection B.1, and shall submit to the APCO an application for a Permit to Operate, no later than January 1, 1990.

  2. A person subject to the provisions of subsection B.2, except a person subject to the provisions of subsection B.2.b, shall meet the following compliance schedule:

  3. a. Submit to the APCO an application for an Authority to Construct for the equipment necessary to comply with the requirements of subsection B.2.a, no later than July 1, 1990, and;

    b. Achieve final compliance with the requirements of subsection B.2.a, and submit to the APCO an application for a Permit to Operate, no later than January 1, 1991.

  4. A person subject to the provisions of subsection B.2.b shall meet the following compliance schedule:

  5. a. Submit to the APCO an application for an Authority to Construct for the equipment necessary to comply with the requirements of subsection B.2.b, no later than January 1, 1991, and;

    b. Achieve final compliance with the requirements of subsection B.2.b, and submit to the APCO an application for a Permit to Operate, no later than July 1, 1991.

  6. A person subject to the provisions of subsection B.2.c shall, in addition, meet the following compliance schedule:

  7. a. Submit to the APCO an application for an Authority to Construct for the equipment necessary to comply with the requirements of subsection B.2.c, no later than January 1, 1992, and;

    b. Achieve final compliance with the requirements of subsection B.2.c, no later than July 1, 1993.

F. Definitions

For the purposes of this rule the following definitions shall apply:

  1. "Ampere-hours": The integral of electrical current (amperes) applied to a plating tank over a period of time (hours).

  2. "Anti-mist additive": A chemical which reduces the emission rate from the tank when added to and maintained in the plating tank.

  3. "Chrome": Metallic chrome.
  4. "Chrome plating": Hard or decorative chrome plating.

  5. "Chromic acid": An aqueous solution of chromium trioxide (CrO3) or a commercial solution containing chromic acid, dichromic acid (H2CrO7), or trichromic acid (H2Cr3O10).

  6. "Chromic acid anodizing": The electrolytic process by which a metal surface is converted to an oxide surface coating in a solution containing chromic acid.

  7. "Chromium": Hexavalent chromium.

  8. "Control equipment": Any device which reduces emissions from the emissions collection system.

  9. "Decorative chrome plating": 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.

  10. "Emission factor": 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.

  11. "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.

  12. "Stationary Source": As defined in Rule 2 of these Rules.

  13. "Sourcewide emissions from hard chrome plating or chromic acid anodizing": The total emissions from all hard chrome plating or chromic acid anodizing at the stationary source over a calendar year. Emissions shall be calculated as the sum of emissions from the emissions collection system at the stationary source. 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.

  14. "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).

  15. "Plating tank": Any container used to hold a chromium or chromic acid solution for the purposes of chrome plating or chromic acid anodizing.

  16. "Uncontrolled chromium emissions from the hard chrome plating or chromic acid anodizing stationary source": The chromium emissions from the emissions collection systems at the stationary source 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.