(F) Systems may use this equation to determine log credit between the indicated values Log credit = (0.001506 x (1.09116) Temp) x CT. (ii) Systems receive the Cryptosporidium treatment credit listed in this paragraph by meeting the corresponding ozone CT values for the applicable water temperature, as described in paragraph (a) of this section. CT values ((MG)(MIN)/L) for Cryptosporidium inactivation by Ozone listed by the log credit with inactivation listed by water temperature in degrees Celsius. (A) 0.25 Log Credit: (I) less than or equal to 0.5 degrees: 6.0; (II) 1 degree: 5.8; (III) 2 degrees: 5.2; (IV) 3 degrees: 4.8; (V) 5 degrees: 4.0; (VI) 7 degrees: 3.3; (VII) 10 degrees: 2.5; (VIII) 15 degrees: 1.6; (IX) 20 degrees: 1.0; (X) 25 degrees: 0.6; and (XI) 30 degrees: 0.39. (B) 0.5 Log Credit: (I) less than or equal to 0.5 degrees: 12; (II) 1 degree: 12; (III) 2 degrees: 10; (IV) 3 degrees: 9.5; (V) 5 degrees: 7.9;
(F) Systems may use this equation to determine log credit between the indicated values Log credit = (0.001506 x (1.09116) Temp) x CT. (ii) Systems receive the Cryptosporidium treatment credit listed in this paragraph by meeting the corresponding ozone CT values for the applicable water temperature, as described in paragraph (a) of this section. CT values ((MG)(MIN)/L) for Cryptosporidium inactivation by Ozone listed by the log credit with inactivation listed by water temperature in degrees Celsius. (A) 0.25 Log Credit: (I) less than or equal to 0.5 degrees: 6.0; (II) 1 degree: 5.8; (III) 2 degrees: 5.2; (IV) 3 degrees: 4.8; (V) 5 degrees: 4.0; (VI) 7 degrees: 3.3; (VII) 10 degrees: 2.5; (VIII) 15 degrees: 1.6; (IX) 20 degrees: 1.0; (X) 25 degrees: 0.6; and (XI) 30 degrees: 0.39. (B) 0.5 Log Credit: (I) less than or equal to 0.5 degrees: 12; (II) 1 degree: 12; (III) 2 degrees: 10; (IV) 3 degrees: 9.5; (V) 5 degrees: 7.9;
DDW-2017-004204.docx