Section 327IAC8-2.6-5. Enhanced filtration and disinfection reporting and record keeping requirements

   Beginning January 1, 2002, a Subpart H system serving a population of at least ten thousand (10,000) individuals and, beginning January 1, 2005, a Subpart H system serving a population of fewer than ten thousand (10,000) individuals that are subject to the requirements of section 3 of this rule and provide conventional filtration treatment or direct filtration shall meet the following requirements in addition to the reporting and record keeping requirements in 327 IAC 8-2-14:

(1) Turbidity measurements as required by section 3 of this rule must be reported within ten (10) days after the end of each month the system serves water to the public. Information that must be reported includes the following:

(A) The total number of filtered water turbidity measurements taken during the month.

(B) The number and percentage of filtered water turbidity measurements taken during the month that are less than or equal to the turbidity limits specified in section 3 of this rule.

(C) The date and value of any turbidity measurements taken during the month that exceed:

(i) one and zero-tenths (1.0) nephelometric turbidity unit for systems using conventional filtration treatment or direct filtration; or

(ii) the maximum level set by the commissioner under section 3 of this rule.

This reporting requirement is instead of the reporting specified in 327 IAC 8-2-14(b).

(2) Subpart H systems serving a population of at least ten thousand (10,000) individuals shall maintain the results of individual filter monitoring taken under section 4 of this rule for at least three (3) years. These systems shall report that they have conducted individual filter turbidity monitoring under section 3 of this rule within ten (10) days after the end of each month they serve water to the public. These systems shall report individual filter turbidity measurement results taken under 327 IAC 8-2.5-4 if measurements demonstrate one (1) or more of the following conditions:

(A) For any individual filter that has a measured turbidity level of greater than one and zero-tenths (1.0) nephelometric turbidity unit in two (2) consecutive measurements taken fifteen (15) minutes apart, Subpart H systems serving a population of at least ten thousand (10,000) individuals shall report the:

(i) filter number;

(ii) turbidity measurement; and

(iii) date when the exceedance occurred.

In addition, the system shall either produce a filter profile for the filter within seven (7) days of the exceedance, if the system is not able to identify an obvious reason for the abnormal filter performance, and report that the profile has been produced or report the obvious reason for the exceedance.

(B) For any individual filter that has a measured turbidity level of greater than five-tenths (0.5) in two (2) consecutive measurements taken fifteen (15) minutes apart at the end of the first four (4) hours of continuous filter operation after the filter has been backwashed or otherwise taken off-line, Subpart H systems serving a population of at least ten thousand (10,000) individuals shall report the:

(i) filter number;

(ii) turbidity measurement; and

(iii) date when the exceedance occurred.

In addition, the system shall either produce a filter profile for the filter within seven (7) days of the exceedance, if the system is not able to identify an obvious reason for the abnormal filter performance, and report that the profile has been produced or report the obvious reason for the exceedance.

(C) For any individual filter that has a measured turbidity level of greater than one and zero-tenths (1.0) nephelometric turbidity unit in two (2) consecutive measurements taken fifteen (15) minutes apart at any time in each of three (3) consecutive months, Subpart H systems serving a population of at least ten thousand (10,000) shall report the filter number, the turbidity measurement, and the date when the exceedance occurred. In addition, the system shall conduct a self-assessment of the filter within fourteen (14) days of the exceedance and report that the self-assessment was conducted. The self-assessment must consist of at least the following components:

(i) Assessment of filter performance.

(ii) Development of a filter profile.

(iii) Identification and prioritization of factors limiting filter performance.

(iv) Assessment of the applicability of corrections.

(v) Preparation of a filter self-assessment report.

(D) For any individual filter that has a measured turbidity level of greater than two and zero-tenths (2.0) nephelometric turbidity units in two (2) consecutive measurements taken fifteen (15) minutes apart at any time in each of two (2) consecutive months, Subpart H systems serving a population of at least ten thousand (10,000) individuals shall report the:

(i) filter number;

(ii) turbidity measurement; and

(iii) date when the exceedance occurred.

In addition, the system shall arrange for the conduct of a CPE by the commissioner or a third party approved by the commissioner not later than thirty (30) days following the exceedance and have the evaluation completed and submitted to the commissioner not later than ninety (90) days following the exceedance.

(3) Additional reporting requirements for Subpart H systems serving a population of at least ten thousand (10,000) individuals are as follows:

(A) If at any time the turbidity exceeds one and zero-tenths (1.0) nephelometric turbidity unit in representative samples of filtered water in a Subpart H system serving a population of at least ten thousand (10,000) individuals using conventional filtration treatment or direct filtration, the system shall inform the commissioner as soon as possible, but not later than the end of the next business day.

(B) If at any time the turbidity in representative samples of filtered water exceeds the maximum level set by the commissioner under section 3 of this rule for filtration technologies other than:

(i) conventional filtration treatment;

(ii) direct filtration;

(iii) slow sand filtration; or

(iv) diatomaceous earth filtration;

Subpart H systems serving a population of at least ten thousand (10,000) individuals shall inform the commissioner as soon as possible, but not later than the end of the next business day.

(4) Beginning January 1, 2005, a Subpart H system serving a population of fewer than ten thousand (10,000) individuals shall maintain the results of individual filter monitoring taken under section 4 of this rule for at least three (3) years. The system shall report that it has conducted individual filter turbidity monitoring under section 4 of this rule within ten (10) days after the end of each month the system serves water to the public. The system shall report to the commissioner the results of conducting individual filter turbidity monitoring under section 3 of this rule within ten (10) days after the end of each month that water is served to the public if measurements demonstrate one (1) or more of the following conditions:

(A) If the turbidity of an individual filter (or the turbidity of combined filter effluent (CFE) for systems with two (2) filters that monitor CFE instead of individual filters) exceeds one and zero-tenths (1.0) NTU in two (2) consecutive recordings fifteen (15) minutes apart, a Subpart H system serving a population of fewer than ten thousand (10,000) individuals shall report to the commissioner by the tenth day of the following month and include:

(i) the filter number or numbers;

(ii) corresponding date or dates; and

(iii) turbidity value or values;

that exceeded one and zero-tenths (1.0) NTU and the cause (if known) for the exceedance or exceedances.

(B) If a Subpart H system serving a population of fewer than ten thousand (10,000) individuals was required to report to the commissioner for three (3) months in a row and turbidity exceeded one and zero-tenths (1.0) NTU in two (2) consecutive recordings fifteen (15) minutes apart at the same filter (or CFE for systems with two (2) filters that monitor CFE instead of individual filters), the system shall conduct a self-assessment of the filter or filters within fourteen (14) days of the day the filter exceeded one and zero-tenths (1.0) NTU in two (2) consecutive measurements for the third straight month unless a CPE as specified in clause (C) was required. Systems with two (2) filters that monitor CFE instead of individual filters shall conduct a self- assessment on both filters. The system shall report to the commissioner the date that the self-assessment was triggered and the date it was completed. The self-assessment must consist of at least the following components:

(i) Assessment of filter performance.

(ii) Development of a filter profile.

(iii) Identification and prioritization of factors limiting filter performance.

(iv) Assessment of the applicability of corrections.

(v) Preparation of a filter self-assessment report.

(C) If a Subpart H system serving a population of fewer than ten thousand (10,000) individuals was required to report to the commissioner for two (2) months in a row and turbidity exceeded two and zero-tenths (2.0) NTU in two (2) consecutive recordings fifteen (15) minutes apart at the same filter (or CFE for systems with two (2) filters that monitor CFE instead of individual filters), the system shall meet the following requirements:

(i) Arrange to have a CPE conducted by the commissioner or a third party approved by the commissioner not later than sixty (60) days following the day the filter exceeded two and zero-tenths (2.0) NTU in two (2) consecutive measurements for the second straight month. A CPE is further conditioned as follows:

(AA) If a CPE has been completed by the commissioner or a third party approved by the commissioner within the twelve (12) prior months or the system and commissioner are jointly participating in an ongoing comprehensive technical assistance (CTA) project at the system, a new CPE is not required.

(BB) If conducted, a CPE must be completed and submitted to the commissioner not later than one hundred twenty (120) days following the day the filter exceeded two and zero-tenths (2.0) NTU in two (2) consecutive measurements for the second straight month.

(ii) Report to the commissioner:

(AA) that a CPE is required; and

(BB) the date that the CPE was triggered;

within ten (10) days after the end of each month that water is served to the public.

(5) Beginning January 1, 2005, disinfection profiling and benchmarking reporting and record keeping requirements for Subpart H systems serving a population of fewer than ten thousand (10,000) individuals are as follows:

(A) Disinfection profiling reporting and record keeping requirements are as follows:

(i) Systems shall report results of optional monitoring that show:

(AA) TTHM levels less than sixty-four thousandths (0.064) mg/L and HAA5 levels less than forty-eight thousandths (0.048) mg/L (only if the system is not conducting a profile); or

(BB) the system has begun disinfection profiling by July 1, 2003, for systems serving five hundred (500) to nine thousand nine hundred ninety-nine (9,999) and January 1, 2004, for systems serving fewer than five hundred (500).

(ii) Systems subject to disinfection profiling under section 2.1 of this rule shall keep results of profiling (including raw data and analysis) indefinitely.

(B) Disinfection benchmarking reporting and record keeping requirements are as follows:

(i) A system considering a significant change to its disinfection practice that is subject to disinfection benchmarking requirements under section 2.1 of this rule shall report the following to the commissioner:

(AA) A description of the proposed change in disinfection.

(BB) The system's disinfection profile for Giardia lamblia (and, if necessary, viruses).

(CC) The system's disinfection benchmark.

(DD) An analysis of how the proposed change will affect the current levels of disinfection.

(ii) Systems subject to disinfection benchmarking under section 2.1 of this rule shall keep the benchmark (including raw data and analysis) indefinitely.

(6) Systems that use lime softening may apply to the commissioner for alternative exceedance levels for the levels specified in subdivisions (2) and (4) if they can demonstrate that higher turbidity levels in individual filters are due to lime carryover only and not due to degraded filter performance.

(Water Pollution Control Division; 327 IAC 8-2.6-5; filed May 1, 2003, 12:00 p.m.: 26 IR 2857; filed Jun 13, 2005, 2:30 p.m.: 28 IR 3253; filed May 7, 2010, 9:30 a.m.: 20100602-IR-327080198FRA)