Idaho Administrative Code › Title IDAPA 58 - Environmental Quality, Department of › Rule 58.01.25 - RULES REGULATING THE IDAHO POLLUTANT DISCHARGE ELIMINATION SYSTEM PROGRAM › Section 58.01.25.303 - CALCULATING PERMIT PROVISIONS

Current through August 31, 2023
01.
Outfalls
			 and Discharge Points
. All permit effluent limitations, standards and
			 prohibitions shall be established for each outfall or discharge point of the
			 permitted facility, except as otherwise provided under Subsection
			 302.13, (Best Management
			 Practices,) and Subsection
			 303.08, (Internal Waste
			 Streams.) (3-24-22)
02.
Production-Based Limitations
. (3-24-22)
a. In the case of POTWs, permit effluent
			 limitations, standards, or prohibitions shall be calculated based on design
			 flow. (3-24-22)
b. Except in the
			 case of POTWs or as provided in Subsection
			 303.02.b.ii., calculation
			 of any permit limitations, standards, or prohibitions which are based on
			 production (or other measure of operation) shall be based upon a reasonable
			 measure of actual production of the facility. (3-24-22)
i. For new sources or new dischargers, actual
			 production shall be estimated using projected production. The time period of
			 the measure of production shall correspond to the time period of the calculated
			 permit limitations; for example, monthly production shall be used to calculate
			 average monthly discharge limitations. (3-24-22)
ii. The Department may include a condition
			 establishing alternate permit limitations, standards, or prohibitions based
			 upon anticipated increased (not to exceed maximum production capability) or
			 decreased production levels. (3-24-22)
iii. For the automotive manufacturing
			 industry only, the Department shall establish an alternate condition under
			 303.02.b.ii., if the applicant satisfactorily demonstrates to the Department,
			 at the time the application is submitted, that: (3-24-22)
(1) Its actual production, as indicated in
			 Subsections 303.02.b. and 303.02.b.i. is
			 substantially below maximum production capability, and (3-24-22)
(2) There is a reasonable potential for an
			 increase above actual production during the duration of the permit.
			 (3-24-22)
iv. If the
			 Department establishes permit conditions under Subsection
			 303.02.b.ii.: (3-24-22)
(1) The permit shall require the permittee to
			 notify the Department at least two (2) business days prior to a month in which
			 the permittee expects to operate at a level higher than the lowest production
			 level identified in the permit. The notice shall specify: (3-24-22)
(a) The anticipated level, and the period
			 during which the permittee expects to operate at the alternate level; and
			 (3-24-22)
(b) If the notice covers
			 more than one (1) month, the notice shall specify the reasons for the
			 anticipated production level increase; and (3-24-22)
(c) New notice of discharge at alternate
			 levels is required to cover a period or production level not covered by prior
			 notice or, if during two (2) consecutive months otherwise covered by a notice,
			 the production level at the permitted facility does not in fact meet the higher
			 level designated in the notice; (3-24-22)
(2) The permittee shall comply with the
			 limitations, standards, or prohibitions that correspond to the lowest level of
			 production specified in the permit, unless the permittee has notified the
			 Department under Subsection
			 303.02.b.ii., in which case
			 the permittee shall comply with the lower of the actual level of production
			 during each month or the level specified in the notice; and (3-24-22)
(3) The permittee shall submit, with the
			 Discharge Monitoring Report, the level of production that actually occurred
			 during each month and the limitations, standards, or prohibitions applicable to
			 that level of production. (3-24-22)