Michigan Administrative Code › Department - Environmental Quality › Water Resources Division › Water Resources Protection › Part 4 - WATER QUALITY STANDARDS › Section R. 323.1043 - Definitions; A to L

Current through Vol. 24-12, July 15, 2024
Rule 43. As used in this part:
(a) "Acceptable daily exposure (ADE)" means
				  an estimate of the maximum daily dose of a substance that is not expected to
				  result in adverse noncancer effects to the general human population, including
				  sensitive subgroups.
(b)
				  "Acceptable wildlife endpoints" means subchronic and chronic endpoints that
				  affect reproductive or developmental success, organismal viability, or growth
				  or any other endpoint that is, or is directly related to, a parameter that
				  influences population dynamics.
(c)
				  "Acute-chronic ratio (ACR)" means a standard measure of the acute toxicity of a
				  material divided by an appropriate measure of the chronic toxicity of the same
				  material under comparable conditions.
(d) "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. The term does not include nonharmful effects such as tissue
				  discoloration alone or the induction of enzymes involved in the metabolism of
				  the substance.
(e) "Agriculture
				  use" means a use of water for agricultural purposes, including livestock
				  watering, irrigation, and crop spraying.
(f) "Anadromous salmonids" means trout and
				  salmon that ascend streams to spawn.
(g) "Aquatic maximum value (AMV)" means the
				  highest concentration of a material in the ambient water column to which an
				  aquatic community can be exposed briefly without resulting in unacceptable
				  effects, calculated according to the methodology specified in R 323.1057(2).
				  The AMV is equal to 1/2 of the tier I or tier II final acute value
				  (FAV).
(h) "Baseline
				  bioaccumulation factor" means, for organic chemicals, a BAF that is based on
				  the concentration of freely dissolved chemicals in the ambient water and takes
				  into account the partitioning of the chemical within the organism. For
				  inorganic chemicals, the term means a BAF that is based on the wet weight of
				  the tissue.
(i) "Baseline
				  bioconcentration factor" means, for organic chemicals, a BCF that is based on
				  the concentration of freely dissolved chemicals in the ambient water and takes
				  into account the partitioning of the chemical within the organism. For
				  inorganic chemicals, the term means a BCF that is based on the wet weight of
				  the tissue.
(j) "Bioaccumulation"
				  means the net accumulation of a substance by an organism as a result of uptake
				  from all environmental sources.
(k)
				  "Bioaccumulation factor (BAF)" 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 where both the organism and its food are exposed and the
				  ratio does not change substantially over time.
(l) "Bioaccumulative chemical of concern
				  (BCC)" means a chemical which, upon entering the surface waters, by itself or
				  as its toxic transformation product, accumulates in aquatic organisms by a
				  human health bioaccumulation factor of more than 1,000 after considering
				  metabolism and other physiochemical properties that might enhance or inhibit
				  bioaccumulation. The human health bioaccumulation factor shall be derived
				  according to R 323.1057(5). Chemicals with half-lives of less than 8 weeks in
				  the water column, sediment, and biota are not BCCs. The minimum BAF information
				  needed to define an organic chemical as a BCC is either a field-measured BAF or
				  a BAF derived using the biota-sediment accumulation factor (BSAF)
				  methodology.The minimum BAF information needed to define an inorganic chemical
				  as a BCC, including an organometal, is either a field-measured BAF or a
				  laboratory-measured bioconcentration factor (BCF). The BCCs to which these
				  rules apply are identified in table 5 of R 323.1057.
(m) "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.
(n) "Bioconcentration
				  factor (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.
(o) "Biota-sediment accumulation factor
				  (BSAF)" means the ratio, in kilograms of organic carbon per kilogram of lipid,
				  of a substance's lipid-normalized concentration in tissue of an aquatic
				  organism to its organic carbon-normalized concentration in surface sediment in
				  situations where the ratio does not change substantially over time, both the
				  organism and its food are exposed, and the surface sediment is representative
				  of average surface sediment in the vicinity of the organism.
(p) "Carcinogen" means a substance which
				  causes an increased incidence of benign or malignant neoplasms in animals or
				  humans or that substantially decreases the time in which neoplasms develop in
				  animals or humans.
(q) "Chronic
				  effect" means an adverse effect that is measured by assessing an acceptable
				  endpoint and results from continual exposure over several generations or at
				  least over a significant part of the test species' projected life span or life
				  stage.
(r) "Coldwater fishery use"
				  means the ability of a waterbody to support a balanced, integrated, adaptive
				  community of fish species which thrive in relatively cold water, generally
				  including any of the following:
(i)
				  Trout.
(ii) Salmon.
(iii) Whitefish.
(iv) Cisco.