KERN COUNTY AIR POLLUTION CONTROL DISTRICT
RULE 429.1 - COOLING TOWERS (HEXAVALENT CHROMIUM)
Requirements of this Rule shall apply to any person who owns or operates, or who plans to build, own, or operate, a cooling tower in which the circulating water is exposed to the atmosphere and to any person who sells or offers for sale cooling tower water treatment chemicals.
A. Hexavalent Chromium/Chromate: a metallic substance existing as part of various inorganic chromate compounds, for example, sodium dichromate or lead chromate.
B. Cooling Tower: a device evaporating circulating water to remove heat from a process, a building, refrigerator, etc. transferring the heat to atmosphere.
C. Water Treatment Chemicals: any combination of chemicals added to cooling tower water including, but not limited to, corrosion inhibitors, antiscalants, tracers, dispersants, and biocides.
D. Wooden Cooling Towers: any cooling tower containing wood components exposed to circulating water.
A. If cooling tower circulating water has:
B. Cooling devices commonly known as evaporative coolers or swamp coolers, whose operating principle is based on cooling air subsequently used to cool a building, residence, or other occupied area, are exempt from the provisions of this Rule except for Subsection IV.B.1.
C. Any cooling tower in which the circulating water is completely contained and not exposed to the atmosphere is exempt from the provisions of this Rule.
A. No person shall sell any water treatment chemical containing chromate for the purpose of adding it to water in a cooling tower.
B. No person shall operate any cooling tower unless the following requirements are met:
a. By December 1, 1992, hexavalent chromium concentration levels in the circulating water shall not exceed 8.0 milligrams per liter (mg/1); and
b. By June 1, 1993, hexavalent chromium concentration levels in the circulating water shall not exceed 0.15 mg/1; and
c. Between December 1, 1992, and June 1, 1993, hexavalent chromium concentration levels in the cooling water shall decrease each month.
V. Administrative Requirements
a. Name, address, and phone number of owner/operator,
b. Location of cooling tower,
c. Cooling tower type and materials of construction,
d. Statement regarding use or non-use of chromate in cooling tower,
e. Statement when chromate will be discontinued if currently utilized, and
f. Current hexavalent chromium concentration level in circulating water.
Any person subject to Subsections IV.B.2. and IV.B.3. shall:
a. Results of all circulating water tests performed pursuant to Subsections V.C. and V.D.,
b. Name and address of laboratory performing tests, and
c. Dates samples were collected and analyses were performed.
C. Test Methods
a. From December 1, 1992 until June 1, 1993, any person subject to Subsection IV.B.2.a. shall test circulating water at least once each month to determine concentration of hexavalent chromium.
b. After June 1, 1993, any person subject to Subsection IV.B.2.b. shall test circulating water at least once every six months to determine concentration of hexavalent chromium.
Unless exempted by Rule 202, existing cooling towers subject to requirements of this Rule shall apply for District Permit to Operate by September 1, 1992; and new cooling towers subject to the provisions of this Rule shall apply for and obtain Authority to Construct prior to commencing construction.