Indiana Administrative Code › Title 327 - WATER POLLUTION CONTROL DIVISION › Article 2 - WATER QUALITY STANDARDS › Rule 1 - Water Quality Standards Applicable to All State Waters Except Waters of the State Within the Great Lakes System › Section 1-9 - Definitions

Current through July 10, 2024
Authority: IC 13-14-8; IC 13-14-9; IC 13-18-3
Affected: IC 13-11-2-265; IC 13-18-3-2; IC 13-18-4
Sec. 9.
In addition to the definitions contained in IC 13-11-2, the
				  following definitions apply throughout this title:
(1) "Acceptable daily intake" or "ADI"
				represents the maximum amount of a substance that if ingested daily for a
				lifetime results in no adverse effects to humans.
(2) "Acute aquatic criterion" or "AAC" means
				the highest concentration of chemical that if met instream will protect the
				aquatic life present from mortality or other irreversible effects due to short
				term exposure. The AAC is equal to one-half (1/2) the final acute value
				(FAV).
(3) "Acute toxicity" means
				concurrent and delayed adverse effects that result from an acute exposure and
				occur within any short observation period, which begins when the exposure
				begins, may extend beyond the exposure period, and usually does not constitute
				a substantial portion of the life span of the organism.
(4) "Adverse effect" means any deleterious
				effect to organisms due to exposure to a substance. The term includes effects
				that are or may become debilitating, harmful, or toxic to the normal functions
				of the organism, but does not include nonharmful effects, such as tissue
				discoloration alone or the induction of enzymes involved in the metabolism of
				the substance.
(5) "Bioaccumulative
				chemical of concern" or "BCC" refers to the following substances:
Table 9-1
Bioaccumulative Chemicals of Concern
CAS Number
Substance
309002
Aldrin
57749
Chlordane
72548
4,4'-DDD; p,p'-DDD; 4,4'-TDE; p,p'-TDE
72559
4,4'-DDE; p,p'-DDE
50293
4,4'-DDT; p,p'-DDT
60571
Dieldrin
72208
Endrin
76448
Heptachlor
118741
Hexachlorobenzene
87683
Hexachlorobutadiene; hexachloro-1,3-butadiene
608731
Hexachlorocyclohexanes; BHCs
319846
alpha-Hexachlorocyclohexane; alpha-BHC
319857
beta-Hexachlorocyclohexane; beta-BHC
319868
delta-Hexachlorocyclohexane; delta-BHC
58899
Lindane; gamma-Hexachlorocyclohexane; gamma-BHC
7439976
Mercury
2385855
Mirex
29082744
Octachlorostyrene
1336363
PCBs; polychlorinated biphenyls
608935
Pentachlorobenzene
39801144
Photomirex
1746016
2,3,7,8-TCDD; dioxin
634662
1,2,3,4-Tetrachlorobenzene
95943
1,2,4,5-Tetrachlorobenzene
8001352
Toxaphene
(6)
				"Bioconcentration" means the net accumulation of a substance by an aquatic
				organism as a result of uptake directly from the ambient water through gill
				membranes or other external body surfaces.
(7) "Bioconcentration factor" or "BCF" means
				the ratio (in liters per kilogram) of a substance's concentration in tissue of
				an aquatic organism to its concentration in the ambient water, in situations
				where the organism is exposed through the water only and the ratio does not
				change substantially over time.
(8)
				"Carcinogen" means a chemical that causes an increased incidence of benign or
				malignant neoplasms, or a substantial decrease in the latency period between
				exposure and onset of neoplasms through oral or dermal exposure, or through
				inhalation exposure when the cancer occurs at nonrespiratory sites in at least
				one (1) mammalian species or man through epidemiological studies or clinical
				studies, or both.
(9) "Chronic
				aquatic criterion" or "CAC" means the highest concentration of chemical that if
				met instream will protect the aquatic life present from toxic effects due to
				long term exposure, for example, adverse effects on growth and
				reproduction.
(10) "Chronic
				toxicity" means concurrent and delayed adverse effects that occur only as a
				result of a chronic exposure.
(11)
				"Coliform bacteria" means all the aerobic and facultatively anaerobic,
				gram-negative, nonsporeforming bacilli that produce acid and gas from the
				fermentation of lactose.
(12)
				"Community" means a general collective term to describe the varieties of
				aquatic species and associated organisms living together in a
				waterbody.
(13) "Criteria
				conversion factors" refers to the conversion factors that are multiplied by
				acute and chronic aquatic criteria developed using toxicological data in the
				form of total recoverable metal to express the criteria in the form of
				dissolved metal. The conversion factor for a particular metal and criterion is
				the fraction of the metal corresponding to an estimate of the percent of the
				total recoverable metal that was dissolved in the aquatic toxicity tests that
				were most important in the derivation of the criterion for the metal.
(14) "Criterion" means a definite numerical
				value or narrative statement promulgated by the environmental rules board to
				maintain or enhance water quality to provide for and fully protect designated
				uses of the waters of the state.
(15) "Discharge-induced mixing" or "DIM"
				means mixing initiated by the use of submerged, high rate diffuser outfall
				structures (or the functional equivalent) that provide turbulent initial mixing
				and will minimize organism exposure time.
(16) "Effluent" means a wastewater discharge
				from a point source to the waters of the state.
(17) "Endangered or threatened species"
				includes those species that are listed as endangered or threatened under
				Section 4 of the Endangered Species Act (ESA) except as specifically provided
				for in 327 IAC 2-1.3.
(18) "ESA"
				means the Endangered Species Act (ESA),
				16
				U.S.C. 1531 et seq.
(19) "Final acute value" or "FAV" means:
(A) a calculated estimate of the
				concentration of a test material such that ninety-five percent (95%) of the
				genera (with which acceptable acute toxicity tests have been conducted on the
				material) have higher genus mean acute values (GMAVs); or
(B) the species mean acute value (SMAV) of an
				important or critical species, if the SMAV is lower than the calculated
				estimate.