Section 327IAC8-2.6-4. Filtration sampling requirements

   (a) In addition to monitoring required by 327 IAC 8-2-8.8, 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 provides conventional filtration treatment or direct filtration shall comply with the following:

(1) Conduct continuous monitoring of turbidity for each individual filter using an approved method in 327 IAC 8-2-8.7.

(2) Calibrate turbidimeters using the procedure specified by the manufacturer.

(3) Record the results of individual filter monitoring every fifteen (15) minutes.

(4) Monthly reporting must be completed and records must be maintained according to section 5 of this rule.

  (b) If there is a failure in the continuous turbidity monitoring equipment, Subpart H systems must comply with the following:

(1) A system serving a population of at least ten thousand (10,000) individuals must conduct grab sampling every four (4) hours instead of continuous monitoring, but for no more than five (5) working days following the failure of the equipment.

(2) Beginning January 1, 2005, a system serving a population of fewer than ten thousand (10,000) individuals must conduct grab sampling every four (4) hours instead of continuous monitoring until the turbidimeter is back in operation.

The system has fourteen (14) days to resume continuous monitoring before a violation is incurred.

  (c) Beginning January 1, 2005, if a system serving a population of fewer than ten thousand (10,000) individuals only consists of two (2) or fewer filters, the following apply:

(1) The system may conduct continuous monitoring of combined filter effluent turbidity instead of individual filter effluent turbidity monitoring.

(2) Continuous monitoring must meet the same requirements set forth in subsections (a) and (b).

(Water Pollution Control Division; 327 IAC 8-2.6-4; 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)