NORTHERN SIERRA AIR QUALITY MANAGEMENT DISTRICT
RULE 902 - AIRBORNE TOXIC CONTROL MEASURE
HEXAVALENT CHROMIUM EMISSIONS FROM COOLING TOWERS
(Adopted: March 30, 1991)
PART 1.0 GENERAL
1.3 Exemption, Discontinued Chromate Treatment
1.4 Exemption, Wooden Cooling Towers
PART 2.0 DEFINITIONS
A. Cooling Tower
B. Hexavalent Chromium/Chromate
C. Water Treatment Chemicals
PART 3.0 STANDARDS
3.1 Prohibition on Hexavalent Chromium/Chromate Use
3.2 Limitation on Circulating Water Hexavalent Chromium Concentrations
PART 4.0 ADMINISTRATIVE REQUIREMENTS
4.1 Existing Cooling Towers, General Requirements
4.2 Existing Cooling Towers, Notification
4.3 Petition for Exemption, Wooden Cooling Towers
4.4 Petition for Exemption From Test Requirements, Discontinued Chromate Treatment
4.5 New Cooling Tower Construction, Notification
PART 5.0 MONITORING AND RECORDS
5.1 Determination of Hexavalent Chromium In Circulating Water
5.2 Testing Requirements
5.3 Record Keeping
HEXAVALENT CHROMIUM EMISSIONS FROM COOLING TOWERS
PART 1 GENERAL
The purpose of this rule is to reduce emissions of hexavalent chromium from cooling towers by eliminating chromium based circulating water treatment processes, pursuant to Title 17, California Code of Regulations, Section 93103. Hexavalent chromium containing compounds may be ingredients of cooling tower circulating water treatment chemicals.
This rule shall apply to any person who owns or operates, or who plans to build, own, or operate, a cooling tower located in the Northern Sierra Air Quality Management District.
|1.3||Exemption, Discontinued Chromate Treatment
Section 5.2 does not apply to cooling tower operators who have not used hexavalent chromium for water treatment since September 23, 1990 or cooling tower circulating water was never treated with hexavalent chromium containing compounds, and who have met all petition for exemption requirements of Section 4.4.
|1.4||Exemption, Wooden Cooling Towers
Operators of cooling towers having wooden components exposed to circulating water may petition for a temporary exemption from the Section 3.2 hexavalent chromium concentration limitation for the period from the compliance date, September 23, 1991, up to March 23, 1992, providing that the petition for exemption requirements of Section 4.3 are met.
PART 3 STANDARDS
|3.1||Prohibition On Hexavalent Chromium/Chromate Use
Effective September 23, 1991, hexavalent chromium containing compounds shall not be added to cooling tower circulating water, and
|3.2||Limitation On Circulating Water Hexavalent Chromium Concentrations
Effective September 23, 1991, a cooling tower shall not be operated with a circulating water hexavalent chromium concentration greater than or equal to 0.15 milligrams per liter.
PART 4 ADMINISTRATIVE REQUIREMENTS
|4.1||Existing Cooling Towers, General Requirements
For cooling towers existing on March 27, 1991, the owner or operator shall notify the District in accordance with Section 4.2, and no later than September 23, 1991, each cooling tower shall comply with Section 3.1 and Section 3.2 requirements. Owners or operators of cooling towers with wooden components exposed to circulating water shall comply with the limitation of Section 3.2, unless a temporary exemption has been granted in accordance with Section 4.3.
Existing Cooling Towers, Notification
No later than June 25, 1991, each person who owns or operates a cooling tower shall submit the following information, in writing, to the District for each cooling tower:
Petition for Exemption, Wooden Cooling Towers
Owners or operators of cooling towers existing on March 27, 1991, with wooden components that are exposed to circulating water may petition the APCO for exemption from the Section 3.2 hexavalent chromium concentration limit of 0.15 milligrams per liter of circulating water for a period of up to six months from the compliance date of September 23, 1991. The following requirements must be met for the temporary exemption to be granted:
Petition for Exemption From Test Requirements, Discontinued Chromate Treatment
The requirements of Section 5.2 apply to any person who owns or operates a cooling tower existing on or prior to March 27, 1991, with the following exception:
PART 5 MONITORING AND RECORDS
|5.1||Determination of Hexavalent Chromium In Circulating Water
Samples of circulating water shall be analyzed for hexavalent chromium as prescribed by American Public Health Method 312B or an equivalent method, as approved by the APCO, and the results reported to the District within 30 days of the date testing is conducted.
Unless a petition for exemption from testing has been made to, and granted by, the APCO in accordance with Section 4.3 prior to September 23, 1991, testing of the cooling tower circulating water shall be conducted and reported as specified in Section 5.1:
Any person subject to Sections 5.1 and 5.2 shall maintain records of the results of all required tests of circulating water for two (2) years and submit them to the District when requested.