Ariz. Admin. Code § R18-11-201 - Definitions
The following terms apply to this Article:
1. "Acute toxicity" means toxicity involving
a stimulus severe enough to induce a rapid response. In aquatic toxicity tests,
an effect observed in 96 hours or less is considered acute.
2. "Agricultural irrigation AZ (AgI AZ)"
means the use of a non-WOTUS protected surface water for crop
irrigation.
3. "Agricultural
livestock watering AZ (AgL AZ)" means the use of a non-WOTUS protected surface
water as a water supply for consumption by livestock.
4. "Aquatic and wildlife AZ (cold water)
(A&Wc AZ)" means the use of a non-WOTUS protected surface water by animals,
plants, or other cold-water organisms, generally occurring at an elevation
greater than 5000 feet, for habitation, growth, or propagation.
5. "Aquatic and wildlife AZ (warm water)
(A&Ww AZ)" means the use of a non-WOTUS protected surface water by animals,
plants, or other warm-water organisms, generally occurring at an elevation less
than 5000 feet, for habitation, growth, or propagation.
6. "Assimilative capacity" means the
difference between the baseline water quality concentration for a pollutant and
the most stringent applicable water quality criterion for that
pollutant.
7. "Complete Mixing"
means the location at which concentration of a pollutant across a transect of a
surface water differs by less than five percent.
8. "Criteria" means elements of water quality
standards expressed as pollutant concentrations, levels, or narrative
statements representing a water quality that supports a designated
use.
9. "Critical flow conditions
of the discharge" means the hydrologically based discharge flow averages that
the director uses to calculate and implement applicable water quality criteria
to a mixing zone's receiving water as follows:
a. For acute aquatic water quality standard
criteria, the discharge flow critical condition is represented by the maximum
one-day average flow analyzed over a reasonably representative
timeframe.
b. For chronic aquatic
water quality standard criteria, the discharge flow critical flow condition is
represented by the maximum monthly average flow analyzed over a reasonably
representative timeframe.
c. For
human health-based water quality standard criteria, the discharge flow critical
condition is the long-term arithmetic mean flow, averaged over several years so
as to simulate long-term exposure.
10. "Critical flow conditions of the
receiving water" means the hydrologically based receiving water low flow
averages that the director uses to calculate and implement applicable water
quality criteria:
a. For acute aquatic water
quality standard criteria, the receiving water critical condition is
represented as the lowest one-day average flow event expected to occur once
every ten years, on average (1Q10).
b. For chronic aquatic water quality standard
criteria, the receiving water critical flow condition is represented as the
lowest seven-consecutive-day average flow expected to occur once every 10
years, on average (7Q10), or
c. For
human health-based water quality standard criteria, in order to simulate
long-term exposure, the receiving water critical flow condition is the harmonic
mean flow.
11.
"Designated use" means a use specified on the Protected Surface Waters List for
a non-WOTUS protected surface water.
12. "Domestic water source AZ (DWS AZ)" means
the use of a non-WOTUS protected surface water as a source of potable water.
Treatment of a surface water may be necessary to yield a finished water
suitable for human consumption.
13.
"Fish consumption AZ (FC AZ)" means the use of a non-WOTUS protected surface
water by humans for harvesting aquatic organisms for consumption. Harvestable
aquatic organisms include, but are not limited to, fish, clams, turtles,
crayfish, and frogs.
14. "Full-body
contact AZ (FBC AZ)" means the use of a non-WOTUS protected surface water for
swimming or other recreational activity that causes the human body to come into
direct contact with the water to the point of complete submergence. The use is
such that ingestion of the water is likely, and sensitive body organs, such as
the eyes, ears, or nose, may be exposed to direct contact with the
water.
15. "Geometric mean" means
the nth root of the product of n items or values. The geometric mean is
calculated using the following formula:
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16.
"Hardness" means the sum of the calcium and magnesium concentrations, expressed
as calcium carbonate (CaCO3) in milligrams per liter.
17. "Mixing zone" means an area or volume of
a surface water that is contiguous to a point source discharge where dilution
of the discharge takes place.
18.
"Non-WOTUS protected surface water" means a protected surface water designated
in Table A of
R18-11-216 or added to the PSWL by
an emergency action authorized by A.R.S. §
49-221(G)(7)
that is not a WOTUS.
19. "Oil"
means petroleum in any form, including crude oil, gasoline, fuel oil, diesel
oil, lubricating oil, or sludge.
20. "Partial-body contact AZ (PBC AZ)" means
the recreational use of a non-WOTUS protected surface water that may cause the
human body to come into direct contact with the water, but normally not to the
point of complete submergence (for example, wading or boating). The use is such
that ingestion of the water is not likely and, sensitive body organs, such as
the eyes, ears, or nose, will not normally be exposed to direct contact with
the water.
21. "Pollutant" means
fluids, contaminants, toxic wastes, toxic pollutants, dredged spoil, solid
waste, substances and chemicals, pesticides, herbicides, fertilizers and other
agricultural chemicals, incinerator residue, sewage, garbage, sewage sludge,
munitions, petroleum products, chemical wastes, biological materials,
radioactive materials, heat, wrecked or discarded equipment, rock, sand, cellar
dirt, and mining, industrial, municipal, and agricultural wastes or any other
liquid, solid, gaseous, or hazardous substance.
22. "Practical quantitation limit" means the
lowest level of quantitative measurement that can be reliably achieved during a
routine laboratory operation.
23.
"Recharge Project" means a facility necessary or convenient to obtain, divert,
withdraw, transport, exchange, deliver, treat, or store water to infiltrate or
reintroduce that water into the ground.
24. "Toxic" means a pollutant or combination
of pollutants, that after discharge and upon exposure, ingestion, inhalation,
or assimilation into an organism, either directly from the environment or
indirectly by ingestion through food chains, may cause death, disease,
behavioral abnormalities, cancer, genetic mutations, physiological malfunctions
(including malfunctions in reproduction), or physical deformations in the
organism or its offspring.
25.
"Urban lake" means a manmade lake within an urban landscape.
26. "Wastewater" does not mean:
a. Stormwater,
b. Discharges authorized under the De Minimus
General Permit,
c. Other allowable
non-stormwater discharges permitted under the Construction General Permit or
the Multi-sector General Permit, or
d. Stormwater discharges from a municipal
storm sewer system (MS4) containing incidental amounts of non-stormwater that
the MS4 is not required to prohibit.
27. "Wetland" means, for the purposes of
non-WOTUS protected surface waters, an area that is inundated or saturated by
surface or groundwater at a frequency and duration sufficient to support, and
that under normal circumstances does support, a prevalence of vegetation
typically adapted for life in saturated soil conditions.
28. "WOTUS" means waters of the state that
are also navigable waters as defined by Section 502(7) of the Clean Water
Act.
29. "WOTUS protected surface
water" means a protected surface water that is a WOTUS.
30. "Zone of initial dilution" means a small
area in the immediate vicinity of an outfall structure in which turbulence is
high and causes rapid mixing with the surrounding water.
Notes
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