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(a) In addition to the requirements of 18 AAC 80.635(c) , the owner or operator of a Class A or Class B public water system that provides filtration treatment shall provide disinfection treatment as required by this section. The disinfection treatment must be sufficient to ensure that the total treatment processes of the system achieve
(1) at least 99.9 percent (3-log) inactivation or removal of Giardia lamblia cysts, as determined by the department; and
(2) at least 99.99 percent (4-log) inactivation or removal of viruses, as determined by the department.
(b) The department will assess the effectiveness of the removal or inactivation of Giardia lamblia cysts in accordance with standard sanitary engineering practices and principles. The owner or operator shall provide a minimum of 0.5 log Giardia lamblia cyst inactivation to supplement filtration and shall maintain a second treatment barrier for microorganisms.
History: Eff. 10/1/99, Register 151
Authority: AS 46.03.020
Editor's note: For guidance regarding standard sanitary engineering practices and principles, as addressed in 18 AAC 80.645(b) , see EPA's Guidance Manual for Compliance with the Filtration and Disinfection Requirements for Public Water Systems Using Surface Water Sources , Appendix M, and the Alaska Water Treatment Guidance Manual. Both publications are referenced at 18 AAC 80.010(d) , and information about how to review or obtain them is in the editor's note to 18 AAC 80.010.
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Last modified 7/05/2006