Nebraska Administrative Code › Topic - HEALTH AND HUMAN SERVICES SYSTEM › Title 179 - PUBLIC WATER SYSTEMS › Chapter 23 - INITIAL DISTRIBUTION SYSTEM EVALUATION (IDSE) › Section 179-23-002 - DEFINITIONS

Current through June 17, 2024
40/30 Certification
means the
				  certification a system provided to the Department saying the system met
				  criteria specified in 40 CFR 141 Subpart U which exempted it from completing an
				  initial distribution system evaluation.
Combined Distribution System
means
				  the interconnected distribution system consisting of the distribution systems
				  of wholesale systems and of the consecutive systems that receive finished
				  water.
Consecutive System
means a public
				  water system that receives some or all of its finished water from one or more
				  wholesale systems. Delivery may be through a direct connection or through the
				  distribution system of one or more consecutive systems.
Dual Sample Set
means a set of two
				  samples collected at the same time and same location, with one sample analyzed
				  for TTHMs and the other sample analyzed for HAA5. Dual sample sets are
				  collected for the purposes of conducting an IDSE under 179 NAC 23 and
				  determining compliance with the TTHM and HAA5 maximum contaminant levels (MCLs)
				  under 179 NAC 24.
Finished Water
means water that is
				  introduced into the distribution system of a public water system and is
				  intended for distribution and consumption without further treatment, except as
				  treatment necessary to maintain water quality in the distribution system
				  (
e.g
., booster disinfection, addition of corrosion control
				  chemicals).
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 Department. The Department 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.
Haloacetic Acids (five) (HAA5)
means the sum of the concentrations in milligrams per liter of the haloacetic
				  acid compounds (monochloroacetic acid, dichloroacetic acid, trichloroacetic
				  acid, monobromoacetic acid, and dibromoacetic acid), rounded to two significant
				  figures after addition.
Locational Running Annual Average
				  (LRAA)
means the average of sample analytical results for samples
				  taken at a particular monitoring location during the previous four calendar
				  quarters.
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.
Wholesale System
means a public
				  water system that treats source water as necessary to produce finished water
				  and then delivers some or all of that finished water to another public water
				  system. Delivery may be through a direct connection or through the distribution
				  system of one or more consecutive systems.