Alaska Administrative Code › Title 18 - Environmental Conservation › Chapter 80 - Drinking Water › Article 13 - General Provisions › 18 AAC 80.1990 - Definitions, abbreviations, and symbols

Current through May 31, 2024
(a) In this
				chapter, unless the context requires otherwise,
(1) "acute risk" means a possible source of a hazard, danger,
				loss, or injury that could quickly affect public health;
(2) "ANSI" means the American National
				Standards Institute, Inc.;
(3)
				"approved" and "approval" mean approved by or the approval of the
				department;
(4) "aquifer" means a
				formation, a group of formations, or part of a formation that contains
				sufficient saturated permeable material to yield economical quantities of water
				to wells and springs;
(5) "AWWA"
				means the American Water Works Association;
(6) "backflow" means the flow, in a direction opposite to the
				normal flow, of a foreign liquid, gas, or substance into the collection or
				distribution system of a public water system;
(7) "best available technology" has the meaning given to "best
				available technology or BAT" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(8) "bottled water" means water
				that is sealed in bottles or other containers and intended for human
				consumption;
(9) "cathodic
				protection well" means an artificial excavation to install equipment or
				facilities for the protection of metallic equipment in contact with the
				ground;
(10) "certified laboratory"
				means a laboratory certified by the department under
				18 AAC 80.1100 -
				18 AAC 80.1110 or by the EPA;
(11) "chloramines" means a group
				of chlorine ammonia compounds formed when chlorine combines with ammonia or
				organic nitrogen in the water;
(12) "cleanout" has the meaning given to
				"cleanout" in
				18 AAC 72.990;
(13) "coagulation" has the meaning given to
				"coagulation" in 40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(14) "coliform" means
(A) aerobic and facultative anaerobic, gram-negative,
				non-spore-forming, rod-shaped bacteria that ferment lactose with gas production
				within 48 hours at 35 degrees Celsius;
(B) aerobic and facultative anaerobic, gram-negative,
				non-spore-forming, rod-shaped bacteria that produce a dark colony with a
				metallic sheen within 24 hours at 35 degrees Celsius on an Endo-type medium
				containing lactose; and
(C) those
				organisms able to produce the enzyme beta-galactosidase which hydrolyzes
				substrate present in a chemically defined medium according to EPA approved
				methods listed in the
Manual for the Certification of Laboratories
				Analyzing Drinking Water,
including supplements, adopted by reference
				in 18 AAC 80.010(b),
				and in accordance with 40
				C.F.R. 141.852, adopted by reference in
				18 AAC 80.010(a);
(15) "combination-source
				system" means a public water system that uses a combination of two or more of
				the following as source water:
(A) a
				groundwater source;
(B) a surface
				water source;
(C) a GWUDISW
				source;
(16) "combined
				chlorine" means the concentration of residual chlorine that is combined with
				ammonia, organic nitrogen, or both in water as a chloramine or other
				chloroderivative;
(17) "community
				sewer line" has the meaning given to "community sewer line" in
				18 AAC 72.990;
(18) "community water system" means a public
				water system that serves at least 15 service connections used by year-round
				residents or regularly serves at least 25 year-round residents;
(19) "compliance cycle" has the meaning
				given to "compliance cycle" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(20) "compliance period" has the meaning
				given to "compliance period" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(21) "composite correction
				program" means a program that includes a comprehensive performance evaluation
				and a comprehensive technical assistance activity;
(22) "composite sample" means a sample
				created by a certified laboratory by mixing equal parts of water from up to
				five different samples;
(23)
				"compositing" means using or creating a composite sample;
(24) "comprehensive technical assistance"
				means the performance improvement phase
(A)
				that is implemented if the comprehensive performance evaluation results
				indicate improved performance potential; and
(B) during which identified plan-specific factors are
				systematically addressed and eliminated;
(25) "confirmation sample" means a second
				sample collected at the same sampling point as the first sample and used for
				re-analysis;
(26) "confluent
				growth" or "CG" has the meaning given to "confluent growth" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(27) "consecutive public water system" has
				the meaning given to "consecutive system" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(28) "constructed conveyance"
(A) means, with respect to a public water
				system, a manmade conduit for water;
(B) includes ditches, culverts, waterways, flumes, mine drains, or
				canals;
(C) does not include a
				water haul vehicle or water that is delivered by bottle, other package unit,
				vending machine, or cooler;
(29) "contaminant" means a physical,
				chemical, biological, or radiological substance or material in water that, in
				sufficient quantity, makes water unfit for human consumption;
(30) "contamination" means the presence in
				water of
(A) a contaminant at a level that
				exceeds
(i)  a maximum contaminant level under
				18 AAC 80.300; or
(ii) an action level, including the lead or
				copper action level under 40
				C.F.R. 141.80, adopted by reference in
				18 AAC 80.010(a);
(B) a contaminant that
(i)  exceeds the allowable limit for removal
				or inactivation by a treatment technique, including the substances set out
				under 18 AAC 80.303; or
(ii) triggers a treatment technique
				requirement under this chapter; or
(C) another contaminant in sufficient quantity to make the water
				unfit for human consumption;
(31) "conventional filtration" has the meaning given to
				"conventional filtration treatment" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(32) "corrective action"
(A) means an action taken to remedy
(i) a deficiency or sanitary defect;
				or
(ii)  a direct, indirect, or
				potential cause, in whole or in part, of a risk to public health, regardless of
				whether that cause is a deficiency or sanitary defect;
(B) includes interim and final measures
				taken to remedy the deficiency, sanitary defect, or cause of a risk to public
				health;
(33) "corrective
				action plan" means a proposal, either made by the department or submitted by
				the owner of a public water system to the department for approval, to take one
				or more corrective actions according to a specified schedule;
(34) "corrosivity" means the tendency of
				internal water to oxidize piping and appurtenances; a noncorrosive water is
				characterized by a slightly positive Langelier index, a driving force index
				greater than 1.0, or an aggressive index greater than or equal to 12.0 for
				asbestos-cement pipe;
(35)
				"cross-connection" means a physical arrangement by which a public water system
				is connected, directly or indirectly, with an unapproved water system, sewer,
				drain, conduit, pool, storage reservoir, plumbing fixture, or other device that
				contains, or might contain, wastewater or other substances of unknown or unsafe
				quality that might be capable of contaminating the water supply through
				backflow; "cross-connection" includes a bypass arrangement, jumper connection,
				removable section, swivel or change-over device, and other temporary,
				permanent, or potential connection through which, or because of which, backflow
				could occur;
(36) "CT" or "CTcalc"
				means the result obtained by multiplying the residual disinfectant
				concentration (C), in mg/1, determined before or at the first customer, and the
				corresponding disinfectant contact time (T), in minutes;
(37) "CT99.9" is the
				CT value required for 99.9 percent (3-log) inactivation of
Giardia
				lamblia
cysts;
(38)
				"decommission" means to fill or plug a well so that it is rendered unproductive
				and does not produce water or serve as a channel for water movement;
(39) "deficiency" means a condition of a
				public water system, or an action or omission of an owner or operator of a
				public water system, that directly or indirectly causes, or has the potential
				to cause,
(A) a risk to public
				health;
(B) an unplanned
				interruption of service in the public water system; or
(C) a deviation from professional standards
				of engineering, sanitation, or public health applicable to public water
				systems;
(40)
				"demonstrate" or "demonstration" means to prove or proof through documentation
				or other evidence to the department's satisfaction;
(41) "department" means the Alaska
				Department of Environmental Conservation;
(42) "design criteria" means information and numerical data such
				as rates, loadings, and other parameters upon which a specific facility design
				is based; "design criteria" include
(A)
				engineering guidelines that specify construction details and materials;
				and
(B) objectives, results, or
				limits that a facility, structure, or process must meet in the performance of
				its intended function;
(43) "detected" means that the analytical result exceeds the
				detection limit specified for the method used to analyze a
				contaminant;
(44) "diatomaceous
				earth filtration" has the meaning given to "diatomaceous earth filtration" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(45) "direct filtration" has the meaning
				given to "direct filtration" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(46) "director" means the director of the
				department's division assigned to environmental health;
(47) "disinfectant" means an oxidant or
				equivalent agent that is intended to inactivate pathogenic microorganisms and
				that is added to water during the treatment or distribution process;
				"disinfectant" includes chlorine, chlorine dioxide, chloramines, and
				ozone;
(48) "disinfectant contact
				time" has the meaning given to "disinfectant contact time" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(49) "disinfection" means a
				process that inactivates pathogenic organisms in water by chemical oxidants or
				equivalent agents;
(50)
				"distribution system" means post-treatment storage facilities, conduits, mains,
				lines, fixtures, pumping stations, or other devices used to carry water to the
				consumer;
(51) "domestic or other
				nondistribution system plumbing problem" has the meaning given to "domestic or
				other nondistribution system plumbing problem" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(52) "DPD" means
				N-N-diethyl-p-phenylenediamine;
(53) "drinking water" means water that is provided for human
				consumption;
(54) "emergency"
				means an unforeseen event that causes damage to or disrupts normal operations
				of a public water system and requires immediate action to protect public health
				and safety;
(55) "engineering
				plans" means a set of plans signed, sealed, and dated by a registered
				engineer;
(56) "EPA" means the
				United States Environmental Protection Agency;
(57) "fecal indicator" means microbes whose
				presence indicates that the water may be contaminated with human or animal
				wastes;
(58) "fill-and-draw system"
				means a water system where the storage tanks are filled with treated water on
				an intermittent basis, while water is drawn as needed from the storage
				tanks;
(59) "filtration" means a
				process to remove particulate matter from water by passage through porous
				media;
(60) "finished water" has
				the meaning given to "finished water" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(61) "flocculation" has the meaning given to
				"flocculation" in 40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(62) "free chlorine" means the amount of
				chlorine available as dissolved gas, hypochlorous acid, or hypochlorite ion
				that is not combined with an amine or other organic compound;
(63) "gross alpha particle activity" means
				the total radioactivity due to alpha particle emission as inferred from
				measurements on a dry sample; "gross alpha particle activity" includes the
				radioactivity of radium-226; "gross alpha particle activity" does not include
				the radioactivity of radon and uranium;
(64) "gross beta particle activity" means the total radioactivity
				due to beta particle emission as inferred from measurements on a dry
				sample;
(65) "groundwater" means
				water beneath the surface of the ground; "groundwater" does not include
				GWUDISW;
(66) "groundwater system"
				means a public water system that uses only groundwater as source
				water;
(67) "GWUDISW", or
				"groundwater under the direct influence of surface water," has the meaning
				given to "groundwater under the direct influence of surface water (GWUDI)" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(68) "heterotrophic plate count" or "HPC"
				means the procedure for estimating the number of live heterotrophic bacteria in
				a water sample;
(69) "holding
				tank" has the meaning given to "holding tank" in
				18 AAC 72.990;
(70) "holding time" means the time elapsed
				from the time a water sample is gathered into the sample bottle until it is
				analyzed;
(71) "human consumption"
				means the use of water for drinking, bathing, showering, cooking, dishwashing,
				maintaining oral hygiene, and other similar uses;
(72) "infiltration gallery" means a system
(A) of perforated pipes, cribbed pits, or
				similar collection devices that are laid along the banks or under the bed of a
				stream, lake, or other surface waterbody; and
(B) that is installed to collect water from the formation beneath
				or adjacent to the waterbody;
(73) "initial compliance period" has the meaning given to "initial
				compliance period" in 40
				C.F.R. 141.2, adopted by reference in
				18 AAC 80.010(a);
(74) "innovative technology or
				device" means water system technology that is new, non-conventional,
				alternative, or untested in this state; "innovative technology or device"
				includes technology related to
(A)
				disinfection and inactivation methods;
(B) removal of pathogens;
(C) particulate reduction;
(D) turbidity reduction;
(E) storage tank materials; and
(F) computer models for water
				treatment;
(75)
				"inspection" means an onsite review by an individual approved by the department
				to determine compliance with this chapter;
(76) "install" means to construct or fabricate components
				necessary to create a public water system or a portion of a public water
				system; installation may be done by the owner or an individual who is
				contracted to do the work for the owner;
(77) "Level 1 assessment" has the meaning given to "Level 1
				assessment" in 40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(78) "Level 2 assessment" has the meaning
				given to "Level 2 assessment" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(79) "master meter" means a water meter or a
				system of water meters that measures both instantaneous and total flow of water
				for a public water system;
(80)
				"maximum contaminant level" or "MCL" means the maximum permissible level of a
				contaminant in water that is delivered to a user of a public water
				system;
(81) "maximum residual
				disinfectant level" or "MRDL" means a level of a disinfectant added for water
				treatment that may not be exceeded at the consumer's tap without an
				unacceptable possibility of adverse health effects;
(82) "method detection limit" has the
				meaning given in Appendix C of the
Manual for the Certification of
				Laboratories Analyzing Drinking Water: Criteria and Procedures, Quality
				Assurance,
adopted by reference in
				18 AAC 80.010(b);
(83) "method reporting limit" has
				the meaning given in Appendix C of the
Manual for the Certification of
				Laboratories Analyzing Drinking Water: Criteria and Procedures, Quality
				Assurance,
adopted by reference in
				18 AAC 80.010(b);
(84) "microbial contaminant" means a living
				organism that is in water, that is not visible individually without a
				microscope, and that, in sufficient quantity, makes the water unsafe for human
				consumption; "microbial contaminants" include bacteria, viruses and parasites
				such as
Cryptosporidium parvum
;
(85) "MIL" means Military Standards and Specifications;
(86) "monthly average" means the result
				obtained by dividing the sum of the result of sample analyses taken in a month
				by the number of samples taken during that month;
(87) "near the first service connection" has
				the meaning given to "near the first service connection" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(88) "new community water system" means
(A) a community water system that is
				constructed after October 1, 1999;
(B) a community water system that has not received a public water
				system identification number under
				18 AAC 80.210(c)(3) as of October 1, 1999;
				or
(C) an existing water system
				other than a community water system, if as a result of expanding its
				infrastructure, the system falls within the definition of a community water
				system;
(89) "new
				non-transient non-community water system" means
(A) a non-transient non-community water system that is constructed
				after October 1, 1999;
(B) a
				non-transient non-community water system that has not received a public water
				system identification number under
				18 AAC 80.210(c)(3) as of October 1, 1999;
				or
(C) an existing water system
				other than a non-transient non-community water system, if as a result of
				expanding its infrastructure, the system falls within the definition of a
				non-transient non-community water system;
(90) "new transient non-community water
				system" means
(A) a transient non-community
				water system that is constructed after October 1, 1999;
(B) a transient non-community water system
				that has not received a public water system identification number under
				18 AAC 80.210(c)(3) as of October 1, 1999;
				or
(C) an existing water system
				other than a transient non-community water system, if as a result of expanding
				its infrastructure, the system falls within the definition of a transient
				non-community water system;
(91) "non-community water system" means a public water system that
				is not a community water system; a non-community water system is either a
				non-transient non-community water system or a transient non-community water
				system;
(92) "nonresidential," with
				respect to buildings, means occupied by an individual, but not as that
				individual's primary place of abode;
(93) "non-transient non-community water system" means a public
				water system that is not a community water system and that regularly serves at
				least 25 of the same individuals over six months per year;
(94) "NSF" means NSF International, also
				known as the National Sanitation Foundation;
(95) "NTU" means nephelometric turbidity unit;
(96) "operator" means a person engaged in
				the operation of a public water system; "operator" does not ordinarily mean an
				official, such as the city engineer or public works superintendent, exercising
				only general administrative supervision;
(97) "organic drilling fluid" means a synthetic polymer drilling
				fluid that is not specifically designed for use in the potable water well
				drilling industry;
(98) "owner"
				means a person who owns a public water system;
(99) "person" has the meaning given to "person" in
				AS
				46.03.900;
(100) "pilot" means serving as an experimental trial apparatus or
				operation in which processes or techniques planned for use in full-scale
				operation are tested in advance;
(101) "pilot plant study" means an evaluation, on a scale larger
				than laboratory or bench scale but smaller than full scale, of the amenability
				of drinking water to treatment with the proposed method, operation, or
				process;
(102) "pit privy" has the
				meaning given to "pit privy" in
				18 AAC 72.990;
(103) "point-of-entry treatment device"
				means a water treatment device that is located where water enters a building
				and before the point of use, and is for the purpose of reducing contaminants in
				the drinking water distributed throughout that building;
(104) "point-of-use treatment device" means
				a water treatment device applied to a single tap and used for the purpose of
				reducing contaminants in drinking water at that one tap;
(105) "pollution" has the meaning given to
				"pollution" in
				AS
				46.03.900;
(106) "potable water system" means a source
				of water, intake works, collection system, water treatment works, storage
				facility, or distribution system from which water is available for human
				consumption;
(107) "practical
				quantitation limit" has the meaning given to "method reporting limit" in this
				subsection;
(108) "private sewer
				line" has the meaning given to "private sewer line" in
				18 AAC 72.990;
(109) "private water line" means a line,
				pipe, or conduit used to carry water as part of a private water
				system;
(110) "private water
				system" means a potable water system that is not a public water
				system;
(111) "professional
				geologist" means a geologist certified under
				AS
				08.02.011;
(112) "proficiency testing sample" has the meaning given to
				"proficiency testing sample" in Appendix C of the
Manual for the
				Certification of Laboratories Analyzing Drinking Water: Criteria and
				Procedures, Quality Assurance,
adopted by reference in
				18 AAC 80.010(b);
(113) "public utility" has the meaning given
				to "public utility" in
				AS
				42.05.990;
(114) "public water system"
(A)
				means a system for the provision to the public of water for human consumption
				through pipes or other constructed conveyances, if the system has at least 15
				service connections or regularly serves an average of at least 25 individuals
				daily at least 60 days out of the year;
(B) is either a community water system or a non-community water
				system;
(C) includes
(i)  a collection, treatment, storage, or
				distribution facility, including a water haul vehicle, under control of the
				operator of the system and used primarily in connection with the system;
				and
(ii)  a collection or
				pretreatment storage facility not under control of the system operator that is
				used primarily in connection with the system;
(D) does not include a private water
				system;
(115) "quality
				assurance" means ensuring that analytical data is of a known and documented
				degree of excellence; "quality assurance" covers the general areas of accuracy,
				completeness, representativeness, and comparability of data;
(116) "quality assurance plan" means a
				totally integrated program for quality assurance, ensuring reliability of
				measurement data;
(117) "quarter"
				or "quarterly" means January through March, April through June, July through
				September, or October through December;
(118) "rain catchment system" means a public water system for
				which the primary source of drinking water is precipitation caught by a manmade
				device;
(119) "record drawings"
				means the original plans prepared for construction and department approval,
				revised to reflect how the system was constructed or installed;
(120) "regional health corporation" means a
				federally recognized corporation under
				25 U.S.C.
				450f that receives federal money for the
				purpose of providing health care to Alaska Natives;
(121) "registered engineer" means a
				professional engineer registered to practice in this state under AS
				08.48;
(122) "repeat compliance
				period" has the meaning given to "repeat compliance period" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(123) "repeat sample" means a follow-up
				sample taken in the same way as a routine sample to confirm the results
				obtained from a routine sample;
(124) "resident" means an individual occupying a dwelling unit as
				a primary place of abode;
(125)
				"residual disinfectant concentration" means the concentration of disinfectant
				measured in mg/l in a representative sample of water;
(126) "routine maintenance" means activity
				normally required to maintain the components of a public water system in good
				working order; "routine maintenance" includes the replacement of 40 feet or
				less of pipe, a valve, a hydro-pneumatic tank, or an in-kind replacement of a
				pump; "routine maintenance" does not include changes that affect the system's
				configuration, material, treatment, or capacity;
(127) "routine sample" means a sample required by
				18 AAC 80.300 -
				18 AAC 80.355,
				18 AAC 80.405, or
				18 AAC 80.500 -
				18 AAC 80.505;
(128) "sampling site" means a location
				identified within a public water system where a water sample is collected for
				analysis;
(129) "sanitary defect"
				has the meaning given to "sanitary defect" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(130) "sanitary seal" means a device that
(A) is attached to the top of a well casing
				or pipe sleeve;
(B) prevents
				insects, dirt, or water or other liquid from entering the well under normal
				conditions; and
(C) allows air to
				flow in and out of the well;
(131) "sanitary survey"
(A)
				means a review consisting of
(i)  an onsite
				inspection and review of the water source, treatment, the distribution system,
				finished water storage, each pump and pump facility and controls, monitoring,
				reporting, data verification, and management and operation of a public water
				system to evaluate the adequacy of the source, facilities, equipment,
				operation, and maintenance for producing and distributing safe drinking water;
				and
(ii) a review of operator
				compliance with 18 AAC 74 and this chapter; and
(B)  includes writing, signing, and submitting the
				completed report to the department and owner;
(132) "sealed" means prepared by a
				registered engineer or an individual under that engineer's direct supervision,
				and bearing the signature and seal of that engineer as required by
				AS
				08.48.221 and
				12 AAC 36.185;
(133) "seasonal system" has the meaning
				given to "seasonal system" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(134) "sedimentation" has the meaning given
				to "sedimentation" in 40
				C.F.R. 141.2, adopted by reference in
				18 AAC 80.010(a);
(135) "septic tank" has the meaning given to
				"septic tank" in
				18 AAC 72.990;
(136) "serve" means to cause or allow the
				provision of water for human consumption;
(137) "service connection" means a single building or structure
				that receives water for human consumption from a public water system; "service
				connection" includes a residence, school, hospital, clinic, office, restaurant,
				gas station, hotel, motel, washeteria, RV connection, or watering point;
				"service connection" does not include mobile facilities; for purposes of this
				paragraph, "mobile facilities" includes planes and boats;
(138) "service line" means the pipe works
				that extend from a water distribution main line to a single service
				connection;
(139) "sewer" or
				"sewer line" has the meaning given to "sewer" or "sewer line" in
				18 AAC 72.990;
(140) "sewerage" has the meaning given to
				"sewerage" in
				18 AAC 72.990;
(141) "significant deficiency" means a
				defect, including a failure or malfunction, in a public water system's source,
				design, treatment, storage, distribution, operation, management, maintenance,
				or security, that the department determines to be causing, or to have potential
				to cause, contamination of water delivered to consumers or any other risk to
				public health or safety;
(142)
				"slow sand filtration" has the meaning given to "slow sand filtration" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
(143) "soil absorption system" has the
				meaning given to "soil absorption system" in
				18 AAC 72.990;
(144) "surface water" means water that is
				open to the atmosphere and subject to surface runoff;
(145) "surface water system" means a public
				water system that uses surface water for a source;
(146) "too numerous to count" has the
				meaning given to "too numerous to count" in
				40 C.F.R.
				141.2, adopted by reference in
				18 AAC 80.010(a);
				(147) "total chlorine" means the total concentration of chlorine in water,
				including the combined chlorine and the free chlorine that are present in
				water;
(148) "transient
				non-community water system" means a non-community water system that serves at
				least 25 individuals daily for 60 or more days per year, but does not regularly
				serve a daily average of at least 25 of the same individuals for more than six
				months per year;
(149) "treatment
				technique requirement" means a requirement in this chapter that specifies, for
				a contaminant, a treatment technique or a process that leads to a reduction in
				the level of a contaminant sufficient to comply with the requirements of this
				chapter;
(150) "UL" means
				Underwriters Laboratories;
(151)
				"unusual and unpredictable circumstances" means events with a low probability
				of occurrence;
(152) "utilidor"
				means an enclosure constructed above ground or below ground that contains one
				or more water lines, sewer lines, or other utilities and that provides access
				for their installation and maintenance;
(153) "vault privy" has the meaning given to "vault privy" in
				18 AAC 72.990;
(154) "virus" means a virus of fecal origin
				that is infectious to humans by waterborne transmission;
(155) "volatile organic chemical" or "VOC"
				means a carbon-based compound with the property of escaping easily from water
				into the air;
(156) "waiver review
				area" means the area around a water source that is evaluated for activities
				that may use, store, or dispose of synthetic organic chemicals and other
				organic chemicals;
(157)
				"wastewater" has the meaning given to "wastewater" in
				18 AAC 72.990;
(158) "wastewater disposal system" has the
				meaning given to "domestic wastewater disposal system" or "nondomestic
				wastewater disposal system," as appropriate for the context, both defined in
				18 AAC 72.990;
(159) "wastewater treatment works" has the
				meaning given to "domestic wastewater treatment works" or "nondomestic
				wastewater treatment works," as appropriate for the context, both defined in
				18 AAC 72.990;
(160) "water hauler" means a public water
				system that consists of one or more vehicles that are owned by the same person
				and used to distribute potable water; "water hauler" does not include vehicles
				owned or operated solely by a public water system as part of its collection or
				distribution system;
(161) "water
				distribution main" means a line, pipe, or conduit used to distribute potable
				water as part of a public water system; "water distribution main" includes
				trunks, branches, and laterals, and lines used to fill vehicles used to
				distribute potable water but does not include private water lines or service
				lines;
(162) "water line" means a
				pipe or conduit used to carry water as part of a public water system; "water
				line" includes a water distribution main but does not include private water
				lines or service lines;
(163)
				"water treatment works" means the structure and appurtenances, including
				chemical feeders, coagulation and sedimentation tanks, filtration devices, ion
				exchange apparatus, aeration tanks, or other works, used to condition, purify,
				or refine water for human consumption;
(164) "waterborne disease outbreak" means a significant occurrence
				of acute infectious illness, epidemiologically associated with the ingestion of
				water from a public water system that is deficient in treatment;
(165) "watering point" means a common tap
				from which a community gets potable water;
(166) "well" means an excavation, opening, shaft, or hole from
				which water can be extracted;
(167)
				"well log" means a written report that includes the information under
				11 AAC 93.140(a)(1) - (18), and under
				18 AAC 80.210(h);
(168) "working day" means a day other than
				Saturday, Sunday, or a state holiday.
(169) "drain" has the meaning given in
				18 AAC 72.990;
(170) "sewer main" has the meaning given in
				18 AAC 72.990;
(171) "sewer service line" has the meaning
				given in 18 AAC 72.990.