Section 327IAC8-2.6-9. Requirements when making a significant change in disinfection practice; disinfection profiling and benchmarking requirements; enhanced treatment for Cryptosporidium

   (a) Following the completion of initial source water monitoring under 40 CFR 141.701(a), as incorporated by reference in section 8(a)(1) of this rule, a PWS that plans to make a significant change to its disinfection practice, as defined in subsection (b), shall do the following:

(1) Develop disinfection profiles and calculate disinfection benchmarks for Giardia lamblia and viruses as described in section 10 of this rule.

(2) Notify the commissioner prior to changing the disinfection practice and include in this notice the following information:

(A) A completed disinfection profile and disinfection benchmark for Giardia lamblia and viruses as described in section 10 of this rule.

(B) A description of the proposed change in disinfection practice.

(C) An analysis of how the proposed change will affect the current level of disinfection.

  (b) Significant changes to disinfection practices are defined as follows:

(1) Changes to the point of disinfection.

(2) Changes to the disinfectant or disinfectants used in the treatment plant.

(3) Changes to the disinfection process.

(4) Any other modification identified by the commissioner as a significant change to disinfection practice.

(Water Pollution Control Division; 327 IAC 8-2.6-9; filed May 7, 2010, 9:30 a.m.: 20100602-IR-327080198FRA)