Wyoming Administrative Code › Agency 020 - Environmental Quality, Dept. of › Sub-Agency 0011 - Water Quality › Chapter 12 - DESIGN AND CONSTRUCTION STANDARDS FOR PUBLIC WATER SUPPLIES › Section 12-5 - Definitions

Current through July 13, 2024
(a) The following
				definitions supplement those contained in W.S. §
									35-11-103 of the Wyoming
				Environmental Quality Act.
(b)
				"Auxiliary source of supply" means any water supply on or available to the
				water user's system other than an approved public water supply acceptable to
				the water supplier. These auxiliary waters may include water from another
				supplier's public potable water supply or any natural source(s), such as a
				well, spring, river, stream, harbor, and so forth; used waters; or industrial
				fluids. These waters may be contaminated or polluted, they may be objectionable
				or they may be from a water source that the water supplier is uncertain of
				sanitary control.
(c) "Average
				daily demand" means the total annual water use divided by the number of days
				the system was in operation.
(d)
				"Backflow" means the undesirable reversal of flow of water or mixtures of water
				and other liquids, gases, or other substances into the distribution system of
				the public water supply from any other source or sources.
(e) "Backflow incident" means any identified
				backflow to a public water supply distribution system or to the potable water
				piping within the water user's system benefitting from a water service
				connection to the public water supply distribution system.
(f) "Back-pressure" means a form of backflow
				caused when the pressure of the water user's system is greater than that of the
				water supply system whether caused by a pump, elevated tank, elevated piping,
				boiler, pressurized process, pressurized irrigation system, or air
				pressure.
(g) "Back-siphonage"
				means a form of backflow caused by negative or reduced pressure in the water
				supply system whether caused by loss of pressure due to high water demands, a
				line break, or excessive firefighting flows.
(h) "Calculated Dose" means the reduction
				equivalent dose (RED) calculated using the dose-monitoring equation that was
				developed through validation testing.
(i) "Contamination" means an impairment of a
				public water supply by the introduction or admission of any foreign substance
				that degrades the quality of the potable water or creates a health
				hazard.
(j) "Cross-connection"
				means any actual or potential connection between a potable water supply and any
				other source or system through which it is possible to introduce contamination
				into the system.
(k) "Degree of
				hazard" means either a high or low hazard situation where a substance may be
				introduced into a public water supply through a cross-connection. The degree of
				hazard or threat to public health is determined by a hazard
				classification.
(l) "Domestic
				services" means services using potable water for ordinary living
				processes.
(m) "Dual check" means a
				device conforming to American Association of Sanitary Engineers (ASSE) Standard
				#1024 consisting of two independently acting check valves.
(n) "Groundwater source" includes all water
				obtained from dug, drilled, bored, jetted, or driven wells; springs that are
				developed so that the water does not flow on the ground and that are protected
				to preclude the entrance of surface contamination; and collection
				wells.
(o) "Hazard classification"
				means a determination by a Hazard Classification Surveyor as to high hazard or
				low hazard and the potential cause of backflow as either backpressure or
				back-siphonage.
(p) "Hazard
				Classification Survey" means inspection of a premises to identify the potable
				water systems, the location of any potential cross-connections to the potable
				water systems, the hazard of the potential backflow, the physical
				identification of any backflow devices or methods present, and the inspection
				status of any backflow devices or methods recorded and certified by a qualified
				Hazard Classification Surveyor.
(q)
				"Hazard Classification Surveyor" means an individual certified by the
				USC-Foundation for Cross-Connection Control and Hydraulic Research as Cross
				Connection Control Specialist (USC-FCCCHR), the ASSE as a Cross-Connection
				Control Surveyor, or another state certification program submitted with the
				permit application and approved by the Administrator, or an individual who is a
				water distribution system operator also certified as a backflow device tester
				employed by the public water supplier for the service where the survey is being
				conducted.
(r) "High hazard" means
				a situation created when any substance that is or may be introduced into a
				public water supply poses a threat to public health through poisoning, the
				spread of disease or pathogenic organisms, or any other public health
				concern.
(s) "Isolated" when
				referring to cross-connections means the properly approved backflow prevention
				devices have been installed at each point of cross-connection within the water
				user's system.
(t) "Low hazard"
				means a situation created when any substance that is or may be introduced into
				a public water supply does not pose a threat to public health but that does
				adversely affect the aesthetic quality of the potable water.
(u) "Maximum daily demand" means the demand
				for water exerted on the system over a period of 24 consecutive hours, for the
				period during which such demand is greatest.
(v) "Maximum hourly demand" means the highest
				single-hour demand exerted on the system. This may or may not occur on the
				maximum day.
(w) "Mechanical sludge
				equipment" means the equipment used to physically remove solids from a water
				treatment process. This may include mechanical drives that use scrapers or
				differential water levels to collect the sludge.
(x) "Mineralized water" means any water
				containing more than 500 mg/L total dissolved solids.
(y) "Minor field change" means any in-field
				adjustment due to previously unknown physical constraints of the project site
				that do not affect the project's scope. Minor field changes still allow full
				compliance with the requirements of this Chapter and are shown on the
				submitted, post-construction as-built plan set for the Division in
				red.
(z) "Primary disinfection"
				means disinfection that kills or inactivates bacteria, viruses, and other
				potentially harmful organisms in drinking water.
(aa) "Reduction Equivalent Dose" means the
				ultraviolet (UV) dose derived by entering the log inactivation measured during
				full-scale reactor testing into the UV dose-response curve that was derived
				through collimated beam testing. RED values are always specific to the
				challenge microorganism used during experimental testing and the validation
				test conditions for full-scale reactor testing.
(bb) "Required Dose" means the UV dose in
				units of mJ/cm2 req needed to achieve the target log inactivation for the
				target pathogen.
(cc) "Secondary
				disinfection" means disinfection that provides longer lasting water treatment
				as the water moves through pipes to consumers.
(dd) "Stabilized drawdown" means a water
				level that has not fluctuated by more than plus or minus 0.5 foot for each 100
				feet of water in the well over at least a six-hour period of constant pumping
				flow rate. The water column is measured from pre-test static water level to the
				top of the deepest water bearing fracture that contributes at least 10 percent
				of total well yield, and plotted measurements that have not shown a trend of
				decreasing water level.
(ee)
				"Surface water source" includes all tributary streams and drainage basins,
				natural lakes, and artificial reservoirs or impoundments upstream from the
				point of the water supply intake.
(ff) "Validated Dose" means the UV dose in
				units of mJ/cm2 delivered by the UV reactor as
				determined through validation testing that is compared to the required dose to
				determine log inactivation credit.
(gg) "Water service connection" means any
				water line or pipe connected to a distribution supply main or pipe for the
				purpose of conveying water to a water user's system.
(hh) "Water supplier" means any entity that
				owns or operates a public water supply, whether public or private.
(ii) "Water user" means any entity, whether
				public or private, with a water service connection to a public water supply and
				includes customers of a public water supplier.
(jj) "Water user's system" means that portion
				of the user's water system between the water service connection and the point
				of use. This system includes all pipes, conduits, tanks, fixtures, and
				appurtenances used to convey, store, or use water provided by the public water
				supply.