NORTH COAST UNIFIED AIR QUALITY MANAGEMENT DISTRICT

SECTION 3

AIRBORNE TOXIC CONTROL MEASURE FOR HEXAVALENT CHROMIUM EMISSIONS FROM CHROMATE TREATED COOLING TOWERS

RULE 3-400 - HEXAVALENT CHROMIUM CONTROL MEASURE FOR COOLING TOWERS

(a) Within 90 days after adoption of this rule by the District, every Owner/Operator of a cooling tower shall provide the following information to the District:

  1. Location of cooling tower(s).

  2. Owner/Operator of cooling tower(s).

  3. Whether or not Owner/Operator uses or has used hexavalent chromium.

  4. When you stopped or plan to stop the use of hexavalent chromium.


(b) Every Owner/Operator of a cooling tower where hexavalent chromium is or has been used shall do the following:

  1. Stop any further addition of hexavalent chromium containing compounds to the cooling tower circulation water after the effective date of this rule.

  2. Within 180 days after the District adopts this rule, the hexavalent chromium concentration in the cooling tower circulating water shall be less than 0.15 milligrams hexavalent chromium per liter of circulating water and shall be maintained below 0.15 milligrams per liter thereafter.

  3. Test the circulating water to determine the concentration of hexavalent chromium every six months. Testing must continue until 2 consecutive required tests show hexavalent chromium concentrations to be below 0.15 milligrams per liter of circulating water. The District may require testing to resume if the District has information that circulating water may contain hexavalent chromium.

  4. Keep the results of all required tests of circulating water for two years, and give them to the District when asked.

  5. Owner/Operators who have wooden cooling towers that are exposed to hexavalent chromium containing compounds shall be exempt from the requirements of Subsection (b)-2 above for a period of 180 days if all of the following conditions are met:
  1. Comply with all other requirements of the rule.

  2. Notify the District that you have a wooden cooling tower exposed to circulating water and that you plan to take advantage of this section.

  3. Test circulating water to determine hexavalent chromium on a monthly basis.

  4. Show a decrease in hexavalent chromium concentrations in circulation water.

  5. Hexavalent chromium concentrations must not exceed 8 milligrams per liter of circulating water.

  6. Keep the test results of circulating water for a period of two years and submit them to the District upon request.


(c) Every Owner/Operator of a cooling tower who has never used hexavalent chromium compounds within one year prior to the effective date of this rule, may petition the Air Pollution Control Officer for an exemption from the testing requirements of this rule. The District may require the testing of the circulating water at any time, if the District has information that the circulating water may contain hexavalent chromium.