Section 327IAC5-2-13. Monitoring

   (a) To assure compliance with permit terms and conditions, all permittees shall monitor, as required in the permit, the following:

(1) The mass, concentration, or other measurement specified in sections 11, 11.1, and 11.6 of this rule for each pollutant specified in the permit.

(2) The volume of wastewater flow at monitoring points specified in the permit, including the final effluent flow from each point source.

(3) Other parameters and conditions as specifically required in the permit.

  (b) A POTW shall monitor the mass, concentration, or other units of specified pollutants in the raw influent, in the discharge from intermediate unit treatment processes as specified in the permit or the applicable report of operation form, and in the final effluent, and the volume of effluent flow. For purposes of this section and sections 14 through 15 of this rule, a POTW includes a municipality or other political subdivision, such as a regional sewer district, that owns or operates a wastewater treatment plant or a water treatment plant, as defined in IC 13-11-2, or a private utility of a quasi-public nature that owns or operates a treatment plant from which a permitted discharge occurs, including a mobile home park or a residential development.

  (c) For purposes of subsections (a) and (b), the commissioner shall specify the following monitoring requirements in the permit:

(1) Requirements concerning proper installation, use, and maintenance of monitoring equipment or methods (including biological monitoring methods where appropriate).

(2) Monitoring frequency, type, and intervals sufficient to yield continuing data representative of the volume of effluent flow and the quantity of pollutants discharged based on the impact of the wastestream on the receiving water, in accordance with 40 CFR 122.44.

(3) Test procedures for the analysis of pollutants meeting the requirements of subsection (d).

  (d) Requirements for test procedures shall be as follows:

(1) Test procedures identified in 40 CFR 136 shall be utilized for pollutants or parameters listed in that part, unless an alternative test procedure has been approved under 40 CFR 136.5.

(2) Where no test procedure under 40 CFR 136 has been approved, analytical work shall be conducted in accordance with test procedures approved by the commissioner.

(3) Notwithstanding subdivision (1), the commissioner may specify in a permit the test procedure specified in a standard or effluent limitations guideline.

  (e) The sampling frequency and other monitoring requirements specified by the commissioner under subsection (c) shall, to the extent applicable, be consistent with monitoring requirements specified in a standard or effluent limitations guideline on which the effluent limitations in the permit are based. In no case shall the sampling frequency be less than once per calendar year.

  (f) Where composite samples are specified in the permit, each fraction of the composite shall be weighted in proportion to the flow corresponding to the time that sample fraction is taken unless the permittee demonstrates that such flow-weighting of sample fractions is not necessary to obtain representative monitoring results. (Water Pollution Control Division; 327 IAC 5-2-13; filed Sep 24, 1987, 3:00 p.m.: 11 IR 628; filed Feb 26, 1993, 5:00 p.m.: 16 IR 1753; filed Jan 14, 1997, 12:00 p.m.: 20 IR 1465; filed Feb 14, 2005, 10:05 a.m.: 28 IR 2125)