SANTA BARBARA COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 335 - CONTROL OF HEXAVALENT CHROMIUM IN COOLING TOWERS
This Rule is applicable to all cooling towers where circulating water is exposed to the atmosphere.
For the purposes of this rule, the following definitions shall apply:
2. "Cooling tower" means a device which evaporates circulating water to remove heat from a process, building or refrigerator and puts heat into the ambient air.
C. Requirements - General
2. No person shall add any hexavalent chromium containing compounds to the circulating water of any cooling tower after July 1, 1990.
3. No person shall operate any cooling tower if the circulating water contains a concentration of hexavalent chromium equal to or greater than 0.15 milligrams per liter after July 1, 1990 except as provided in Section C.4.
4. Cooling towers containing wooden components, exposed to the circulating water, will be allowed to exceed the limit of 0.15 milligrams per liter until January 1, 1991. Any owner or operator of any such cooling tower shall:
b. Test the circulating water to determine the hexavalent chromium concentration during the last week of each month from July 1, 1990 to January 1, 1991.
c. Assure that the concentration of hexavalent chromium in the circulating water shows a continuing decrease each month.
d. Submit copies of the monthly test reports to the District no later than the 21st calendar day of the following month.
D. Requirements - Testing
b. Semiannually after July 1, 1990 for the concentration of hexavalent chromium in milligrams per liter.
E. Test Method
2. All test samples will be taken when the cooling water has been circulating for at least two hours.
3. All test samples will be taken no less than two hours after the addition of make-up water has ceased.
The results of all testing accomplished shall be maintained on site for a minimum of three years and be shall be made available to the District on request.
2. The results of testing accomplished under Section D.1.b will be submitted to the District annually, not later than 60 days after the start of each calendar year.
3. If testing will be suspended under Section D.2, the last annual report shall contain a statement to that effect.
I. Compliance Schedule
2. The owner or operator of any cooling tower using hexavalent chromium or which used hexavalent chromium after July 1, 1989, constructed or under construction on January 9, 1990, shall submit a compliance plan to the District by April 1, 1990 delineating actions to be taken to attain compliance. This plan shall include the following information and shall be accompanied by the fee specified in Rule 210.
b. Location of tower
(2) Plot Plan
(2) Type of construction
(3) Water flow rate
e. State when the use of hexavalent chromium ceased or will cease.
f. Specification of what treatment process will replace hexavalent chromium in the cooling tower.
g. If tower has wooden components, whether demonstration of compliance will be under the compliance date in Section C.4.