Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 13 - SURFACE WATER TREATMENT › Section 179-13-002 - DEFINITIONS

Current through June 17, 2024
Code of Federal Regulations (CFR)
means the Code of Federal Regulations as it existed on the effective date of
				  these regulations, and any CFR citations mentioned in these regulations are
				  hereby incorporated by reference. Copies of the CFR as it existed on the
				  effective date of these regulations can be obtained on the DHHS website at
http://dhhs.ne.gov/publichealth/Pages/enh_pwsindex.aspx
or by requesting a copy via email from the Department at:
DHHS.drinkingwater@nebraska.gov
or by calling
				  402-471-2541.
Conventional filtration treatment
means a series of processes including coagulation, flocculation, sedimentation,
				  and filtration resulting in substantial particulate removal.
CT or CTcalc
means the product of
				  "residual disinfectant concentration" (C) in milligrams per liter determined
				  before or at the first customer, and the corresponding "disinfectant contact
				  time" (T) in minutes, i.e., "C" x "T".
CT( 99.9)
means the CT value required for 99.9% (3-log) inactivation of
Giardia
				  lamblia
cysts. CT( 99.9) for a variety of
				  disinfectants and conditions appear in Tables 13.1 to 13.8 of 179 NAC
				  13-007.02C.
Department
means the Division of
				  Public Health of the Department of Health and Human Services.
Diatomaceous earth filtration
means
				  a process resulting in substantial particulate removal in which
1. A precoat cake of diatomaceous earth
				filter media is deposited on a support membrane (septum), and
2. While the water is filtered by passing
				through the cake on the septum, additional filter media known as body feed is
				continuously added to the feed water to maintain the permeability of the filter
				cake.
Direct filtration
means a series of
				  processes including coagulation and filtration but excluding sedimentation
				  resulting in substantial particulate removal.
Director
means the Director of
				  Public Health of the Division of Public Health or his/her authorized
				  representative.
Disinfection
means a process which
				  inactivates pathogenic organisms in water by chemical oxidants or equivalent
				  agents.
Disinfection contact time
("T" in
				  CT calculations) means the time in minutes that it takes for water to move from
				  the point of disinfectant application or the previous point of disinfectant
				  residual measurement to a point before or at the point where residual
				  disinfectant concentration ("C") is measured.
Filtration
means a process for
				  removing particulate matter from water by passage through porous media.
Flocculation
means a process to
				  enhance agglomeration or collection of smaller floc particles into larger, more
				  easily settleable particles through hydraulic or mechanical means.
Ground water under the direct influence of
				  surface water
(GWUDI) means any water beneath the surface of the
				  ground with significant occurrence of insects or other macroorganisms, algae,
				  or large-diameter pathogens such as
Giardia lamblia
or
Cryptosporidium
, or significant and relatively rapid shifts in
				  water characteristics such as turbidity, temperature, conductivity, or pH which
				  closely correlate to climatological or surface water conditions. Direct
				  influence must be determined for individual sources in accordance with criteria
				  established by the Director. The Director determination of direct influence may
				  be based on site-specific measurements of water quality and/or documentation of
				  well construction characteristics and geology with field evaluation as
				  described in 179 NAC 13 Attachment 2 which is hereby incorporated by
				  reference.
Halogen
means one of the chemical
				  elements chlorine, bromine, or iodine.
Inactivation ratio
means the ratio
				  of CT to CT( 99.9),
i.e.
, CT divided by
				  CT( 99.9).
Legionella
means a
				  genus of bacteria, some species of which have caused a type of pneumonia called
				  Legionnaires Disease.
Sedimentation
means a process for
				  removal of solids before filtration by gravity or separation.
Slow sand filtration
means a
				  process involving passage of raw water through a bed of sand at a low velocity
				  (generally less than 0.4 m/h) resulting in substantial particulate removal by
				  physical and biological mechanisms.
Surface water
means all water which
				  is open to the atmosphere and subject to surface runoff.
Surface water system
means a water
				  system utilizing surface water as the source of water.
Treatment technique
means the use
				  of aeration, settling, filtration, or other physical process and/or the
				  addition of any chemical or chemicals for the purpose of removing,
				  deactivation, or adjusting the level of one or more contaminants present in the
				  raw water source.
Trihalomethane
(THM) means one of a
				  family of organic compounds, named as derivatives of methane, wherein three of
				  the four hydrogen atoms in methane are each substituted by a halogen atom in
				  the molecular structure.
Total trihalomethanes
(TTHMs) means
				  the sum of the concentration in milligrams per liter of the trihalomethane
				  compounds [trichloromethane (chloroform), dibromochloromethane,
				  bromodichloromethane, and tribromomethane (bromoform)], rounded to two
				  significant figures.
Virus
means a virus of fecal origin
				  which is infectious to humans by waterborne transmission.
Waterborne disease outbreak
means
				  the significant occurrence of acute infectious illness, epidemiologically
				  associated with the ingestion of water from a public water system which is
				  deficient in treatment as determined by the Director.