MOJAQMD RULE 1502 DECORATIVE & HARD CHROME PLATING & CHROMIC ACID ANODIZING
LAST REVISED 09/23/91



RULE 1502

DECORATIVE & HARD CHROME PLATING &

CHROMIC ACID ANODIZING

(Adopted: September 23, 1991)



The purpose of this rule is to control emissions from decorative and hard chrome plating and chromic acid anodizing facilities.



(A) Definitions

For the purposes of this Rule, the following definitions shall apply:

  1. "Ampere-hours" means the integral of electrical current applied to a plating tank (Amperes) over a period of time (hours).

  2. "Anti-mist Additive" means a chemical which reduces the emission rate from the tank when added to and maintained in the plating tank.

  3. "Chrome" means metallic chrome.

  4. "Chrome Plating" means either hard or decorative chrome plating.

  5. "Chromic Acid" means an aqueous solution of chromium trioxide (CRO3) or a commercial solution containing chromic acid, dichromic acid (H2CR2O7) or trichromic acid (H2CR3O10).

  6. "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.

  7. "Chromic" means hexavalent chromium.

  8. "Control Equipment" means any device which reduces emissions from the emission collection system.

  9. "Decorative Chrome Plating" means the process by which chromium is electro-deposited 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" means the mass of chromium emitted to the atmosphere determined by a test conducted (under operating conditions) on the individual plating tank in accordance with the ARB Test Method 425, divided by the ampere-hours consumed by the tank expressed as the mass of chromium emitted per ampere-hour of electrical current consumed.

  11. "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.

  12. "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.

  13. "Facility-wide 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 plating tank(s) at the facility. The emissions from the tank(s) shall be calculated by multiplying the emission factor by the sum of ampere-hours consumed during that year for all of the tanks within the facility.
  14. "Hard Chrome Plating" means the process by which chromium is electro-deposited 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" means 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 Facility" means the chromium emissions from the emission 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 the ARB Test Method 425 or 14/ampere-hours, whichever is less.

(B) Standards

  1. Requirements for Decorative Chrome Plating Facilities

  2. (a) No person shall operate a decorative chrome plating tank unless an anti-mist additive is continuously maintained in the plating tank and/or control equipment is installed and used in a manner which is approved by the District Air Pollution Control Officer.

    (b) The control measure(s) must reduce chromium emissions by 95% or more.



  3. Requirements for Hard Chrome Plating and Chromic Acid Anodizing Facilities

  4. (a) No person shall operate a plating tank for hard chrome plating or chromic acid anodizing unless the tank has an emissions collection system.

    (b) No person shall operate a hard chrome plating or chromic acid anodizing tank which emits less than 2 pounds/year unless:

      (i) The chromium emissions from the emissions collection system serving the plating tank have been reduced by 95% or more of the uncontrolled chromium emissions, or;

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

    (c) No personshall operate a hard chrome plating tank or chromic acid anodizing tank at a facility if facility-wide chromium emissions from hard chrome plating or chromic acid anodizing are greater than 2 pounds, but less than 10 pounds per year, unless:

      (i) The chromium emissions from the emissions collection systems serving the plating tank have been reduced by at least 99% of the uncontrolled chromium emissions from the hard chrome plating or chromic acid anodizing facility, or;

      (ii) The chromium emissions from the emissions collection systems are reduced to less than 0.03 mg of chromium per ampere-hour of electrical charge applied to the tanks.

    (d) No person shall operate a hard chrome plating or chromic acid anodizing tank at a facility if facility-wide chromium emissions from hard chrome plating or chromic acid anodizing are 10 pounds per year or greater, unless:

      (i) The chromium emissions from the emissions collection systems serving the plating tanks have been reduced by at least 99.8% of the uncontrolled chromium emissions from the hard chrome plating or chromic acid anodizing facility, or;

      (ii) The chromium emissions from the emissions collection systems are reduced to less than 0.006 mg of chromium per ampere-hour electrical charge applied to the tanks.



(C) Recordkeeping

  1. The owners or operators of all decorative chrome plating, hard chrome plating, and chromic acid anodizing facilities shall maintain a continuous record of anti-mist additive concentrations, and/or control equipment maintenance logs, and ampere-hour readings integrated over time for all plating tanks.

  2. Records shall be maintained for each collection system for a minimum of two years and shall be made available, upon request, to the District.

(D) Compliance Schedule

  1. Decorative Chrome Plating Facilities

  2. (a) Not later than six months after District adoption of this Rule, the owner or operator of decorative chrome plating tanks must comply with the provisions of Section (B)(1).

  3. Hard Chrome Plating and Chromic Acid Anodizing Facilities

  4. (a) Not later than twelve months after District adoption of this Rule, the owner or operator of a hard chrome plating or chromic acid anodizing facility subject to Section (B)(2)(b) shall submit to the District Air Pollution Control Officer an application for an Authority to Construct the equipment necessary to meet the requirements of the Rule. Not later than eighteen months after District adoption of this Rule the facility shall be in compliance with the requirements of Section (B)(2)(b).

    (b) Not later than eighteen months after District adoption of this Rule, the owner or operator of a hard chrome plating or chromic acid anodizing facility subject to Section (B)(2)(c) shall submit to the District Air Pollution Control Officer an application for an Authority to Construct the equipment necessary to meet the requirements of the Rule. Not later than twenty-four months after District adoption of this Rule, the facility shall be in compliance with the requirements of Section (B)(2)(c).

    (c) Not later than twenty four months after District adoption of this Rule, the owner or operator of a hard chrome plating or chromic acid anodizing facility subject to Section (B)(2)(d) shall submit to the District Air Pollution Control Officer an application for an Authority to Construct the equipment necessary to meet the requirements of the Rule. Not later than forty-eight months after District adoption of this Rule, the facility shall be in compliance with the requirements of Section (B)(2)(d).