Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 5 - INDUSTRIAL WASTEWATER PRETREATMENT PROGRAMS AND NPDES
Rule 10 - Additional Treatment Requirements
Section 10-4 - Lake dischargers and sinkhole dischargers
Universal Citation: 327 IN Admin Code 10-4
Current through September 18, 2024
Authority: IC 13-13-5; IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3
Affected: IC 13-11-2; IC 13-18-4
Sec. 4.
(a) The following effluent limitations apply to all POTWs or other sanitary discharges directly to lakes or reservoirs (either natural or manmade impoundments) or within two (2) miles upstream from such a waterbody, and to discharges of sanitary wastewater directly to sinkholes, underground streams, or to surface streams within two (2) miles upstream of such features (where a discharge of industrial process wastewater contains a sanitary component, these standards apply only to the sanitary component of such discharges):
(1) Concentrations table as follows:
| Pollutant | Monthly Average Concentrations (mg/l) | Weekly Average Concentrations (mg/l) |
| CBOD5 | 10 | 15 |
| Total Suspended Solids (TSS) | 12 | 18 |
| T. Ammonia, as N | ||
| Summer (May through November) | 1.1 | 1.6 |
| Winter (December through April) | 1.6 | 2.4 |
(2)
Ammonia nitrogen limitations are derived using conservation of mass principles,
assuming no stream flow dilution (Q7,10) and using the
criteria contained in
327 IAC
2-1-6(b)(5)(A), using year-round
stream pH of seven and eight-tenths (7.8) s.u., instream temperature of
twenty-five degrees Celsius (25°C) summer, ten degrees Celsius (10°C)
winter, with the results rounded to the nearest one-tenth (0.1) milligram per
liter. If the receiving stream is regulated by criteria contained in
327 IAC
2-1-6(b)(5)(B) through
327 IAC
2-1-6(b)(5)(D) or
327 IAC
2-1.5-8, these criteria will be used to determine
water quality-based effluent limitations for ammonia in lieu of the criteria in
subdivision (1) to derive appropriate ammonia nitrogen limitations.
(3) Dissolved oxygen in the effluent from any
facility deemed to be a lake discharger or sinkhole discharger shall not fall
below six (6.0) milligrams per liter minimum daily average.
(4) Notwithstanding the provisions of section
2(a) of this rule, effluent phosphorus for any lake discharger shall not exceed
one (1.0) milligram per liter.
(5)
In addition, water quality-based limitations for any other toxic substance may
be included in the permit if the toxic substance is or may be discharged at a
level which will cause, have the reasonable potential to cause, or contribute
to an excursion above any applicable narrative or numeric water quality
criteria or value promulgated under 327 IAC 2-1 or 327 IAC
2-1.5.
(b) If deemed necessary to comply with water quality standards, such as discharges to streams which are classified for cold water aquatic life, more stringent limitations may be applied on a case-by-case basis.
(c) Additional requirements for sinkhole dischargers include the following:
(1)
Disinfection is required on a year-round basis. Where chlorine or bromine
compounds are used as the disinfectant, dechlorination is required in
accordance with section 6(c)(3) of this rule.
(2) Effluent limitations, monitoring, and
reporting requirements for E. coli will be included in the NPDES
permit.
(3) As part of any initial
application and as part of any subsequent application for renewal, the
following information shall be included:
(A)
A statement as to why a direct discharge to surface waters is impractical. This
statement should address the proximity of surface waters and the cost
associated with locating or relocating the discharge to such waters.
(B) The results of two (2) dye-tracing
studies, one (1) conducted during low flow conditions and one (1) conducted
during high flow conditions. This study shall be signed by a qualified
hydrologist and shall include a review and identification of all ground water
users (private wells) within a five (5) mile radius and demonstrate to the
extent possible the direction of movement and ultimate fate of ground water in
the area. Sampling shall also be conducting of any readily accessible cave
streams and at any rises. A diligent effort to notify all potentially affected
ground water users in the area of the intent to discharge and the dye-tracing
study shall be made, which may include a public notice.
(4) If a dye-tracing study conducted as
required by subdivision (3) indicates the presence of effluent in private wells
(or the probability of such for new discharges):
(A) the permittee (or applicant) shall
conduct routine (a minimum of twice annually, once during high flow and once
during low flow conditions) monitoring of each such well for nitrates and E.
coli and shall report the results to the private users and the department of
environmental management, office of water management; and
(B) permit limitations may be imposed based
on drinking water standards from 327 IAC 8-2.
(5) If the well sampling required by
subdivision (4) demonstrates that bacterial or nitrate contamination (above the
values prescribed by 327 IAC 8-2) of private wells is occurring:
(A) the commissioner may require that the
discharger supply potable water to any and all such affected parties;
and
(B) the permit may be reopened
to include revised effluent limitations.
(6) Before a NPDES permit is issued for any
planned new discharge, all possible alternative methods of disposal shall be
considered and evaluated. This NPDES permit will not be issued unless no
alternative disposal method is feasible. Alternatives may include, but not be
limited to, land application, connection with an existing POTW not discharging
to a sinkhole, piping to surface waters, or off-site transport and
disposal.
Disclaimer: These regulations may not be the most recent version. Indiana may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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