Ala. Admin. Code r. 335-7-2-.16

Current through Register Vol. 42, No. 12, September 30, 2024

Section 335-7-2-.16 - Operational Evaluation Level

(1) A system has exceeded the operational evaluation level at any monitoring location where the sum of the two previous quarters' TTHM results plus twice the current quarter's TTHM result, divided by 4, exceeds 0.080 mg/L, or where the sum of the two previous quarters' HAA5 results plus twice the current quarter's HAA5 result, divided by 4, exceeds 0.060 mg/L.

(2) If the operational evaluation level has been exceeded, the system must conduct an operational evaluation and submit a written report of the evaluation to the Department no later than 90 days after being notified of the analytical result that causes the system to exceed the operational evaluation level. The written report must be made available to the public upon request.

(3) The operational evaluation must include an examination of system treatment and distribution operational practices, including storage tank operations, excess storage capacity, distribution system flushing, changes in sources or source water quality, and treatment changes or problems that may contribute to TTHM and HAA5 formation and what steps could be considered to minimize future exceedences.

(4) The system may request to limit the scope of the evaluation if the system is able to identify the cause of the operational evaluation level exceedance. The request to limit the scope of the evaluation does not extend the schedule in paragraph (2) of this rule for submitting the written report. The Department must approve this limited scope of evaluation in writing and the system must keep that approval with the completed report.

(5) If a consecutive system exceeds the TTHM and/or the HAA5 MCLs per paragraph 335-7-2-.12(a) then the following applies:

(i) A joint operational evaluation must be completed which includes the wholesale system that supplies water to the site where the exceedance occurred, and any consecutive system that conveys the water where the exceedance occurred.

(ii) The joint operational evaluation must be signed by responsible officials from each wholesale and consecutive system

(iii) Representatives from all systems involved shall meet quarterly to evaluate the effectiveness of the measures implemented based on the operational evaluation.

(I) An attendance list and meeting minutes shall be submitted to the Department within 30 days of the meeting.

(II) Once the consecutive system complies with the TTHM and/or HAA5 MCLs, then the quarterly meeting will no longer be required.

Ala. Admin. Code r. 335-7-2-.16

New Rule: Filed December 18, 2007; effective January 22, 2008. Amended: Filed August 21, 2012; effective September 25, 2012.

Author: Dennis D. Harrison

Statutory Authority:Code of Ala. 1975, §§ 22-23-33, 22-23-49, 22-22A-5, 22-22A-6.