179 Neb. Admin. Code, ch. 13, § 002
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
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).
Legionellameans 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.
179 Neb. Admin. Code, ch. 13, § 002