Michigan Administrative Code › Department - Environmental Quality › Drinking Water And Municipal Assistance Division › Supplying Water to the Public › Part 1 - GENERAL PROVISIONS › Section R. 325.10105 - Definitions; F to L

Current through Vol. 24-12, July 15, 2024
Rule 105. As used in these rules:
(a) "Federal act" means the safe drinking
				  water act of 1974,
				  42
				  U.S.C. §
											300f et seq. and the state and
				  local assistance set forth in 40 C.F.R. part 35, §35.600 to §35.630;
				  national primary drinking water regulations set forth in 40 C.F.R. part 141;
				  and national primary drinking water regulations implementation set forth in 40
				  C.F.R. part 142 promulgated by EPA (2014) under the federal act.
(b) "Filter profile" means a graphical
				  representation of individual filter performance, based on continuous turbidity
				  measurements or total particle counts versus time for an entire filter run,
				  from startup to backwash inclusively, that includes an assessment of filter
				  performance while another filter is being backwashed.
(c) "Finished water" means water that is
				  introduced into the distribution system of a public water supply and is
				  intended for distribution and consumption without further treatment, except as
				  treatment necessary to maintain water quality in the distribution system, for
				  example, booster disinfection, addition of corrosion control
				  chemicals.
(d) "Firm capacity," as
				  applied to wells, pumping stations, or units of treatment systems, means the
				  production capability of each respective part of the waterworks system with the
				  largest well, pump, or treatment unit out of service.
(e) "First draw sample" means a 1-liter
				  sample of tap water which has been standing in plumbing pipes for not less than
				  6 hours and which is collected without flushing the tap.
(f) "Flowing stream" means a course of
				  running water flowing in a definite channel.
(g) "GAC10" means granular activated carbon
				  filter beds with an empty-bed contact time of 10 minutes based on average daily
				  flow and a carbon reactivation frequency of every 180 days, except that the
				  reactivation frequency for GAC10 used as a best available technology for
				  compliance with TTHM and HAA5 MCLs based on a locational running annual average
				  under
				  R
				  325.10610 is 120 days.
(h) "GAC20" means granular activated carbon
				  filter beds with an empty-bed contact time of 20 minutes based on average daily
				  flow and a carbon reactivation frequency of every 240 days.
(i) "Gravity storage tank" means an elevated
				  or ground level finished water storage reservoir that, during normal use,
				  operates under atmospheric pressure.
(j) "Ground water" or "groundwater" means the
				  water in the zone of saturation in which all of the pore spaces of the
				  subsurface material are filled with water.
(k) "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, that closely correlate to
				  climatological or surface water conditions. The department will determine
				  direct influence for individual sources in accordance with this definition and
				  R
				  325.10611(1) and will notify the
				  supply of its determination.
(l)
				  "Grout" means neat cement, concrete, or other sealing material which is
				  approved by the department and which is used to seal a well casing in a
				  well.
(m) "Haloacetic acids (five)
				  (HAA5)" mean 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
				  2 significant figures after addition.
(n) "Imminent hazard" means that, in the
				  judgment of the director, there is a violation, or a condition that may cause a
				  violation, of the state drinking water standards at a public water supply
				  requiring immediate action to prevent endangering the health of
				  people.
(o) "Initial compliance
				  period" means January 1993 to December 1995. For a supply that has less than
				  150 service connections, the initial compliance period is January 1996 to
				  December 1998 for contaminants listed in part 6 of these rules that have an
				  effective date of January 17, 1994.
(p) "Lake/reservoir" means a natural or
				  man-made basin or hollow on the Earth's surface in which water collects or is
				  stored that may or may not have a current or single direction of
				  flow.
(q) "Large water supply" or
				  "large water system," for the purpose of lead and copper control, means a
				  public water supply that serves more than 50,000 persons.
(r) "Lead service line" means either a
				  service line which is made of lead or any lead pigtail, lead gooseneck, or
				  other lead fitting that is connected to the service line, or both.
(s) "Level 1 assessment" means an evaluation
				  to identify the possible presence of sanitary defects, defects in distribution
				  system coliform monitoring practices, and (when possible) the likely reason
				  that the supply triggered the assessment. Level 1 assessment shall be conducted
				  by the supply operator or owner. Minimum elements include review and
				  identification of atypical events that could affect distributed water quality
				  or indicate that distributed water quality was impaired; changes in
				  distribution system maintenance and operation that could affect distributed
				  water quality (including water storage); source and treatment considerations
				  that bear on distributed water quality, where appropriate (for example, whether
				  a ground water supply is disinfected); existing water quality monitoring data;
				  and inadequacies in sample sites, sampling protocol, and sample processing. The
				  supply shall conduct the assessment consistent with any department directives
				  that tailor specific assessment elements with respect to the size and type of
				  the supply and the size, type, and characteristics of the distribution
				  system.
(t) "Level 2 assessment"
				  means an evaluation to identify the possible presence of sanitary defects,
				  defects in distribution system coliform monitoring practices, and (when
				  possible) the likely reason that the supply triggered the assessment. A level 2
				  assessment provides a more detailed examination of the supply (including the
				  supply's monitoring and operational practices) than does a level 1 assessment
				  through the use of more comprehensive investigation and review of available
				  information, additional internal and external resources, and other relevant
				  practices. Level 2 assessment shall be conducted by the department. Minimum
				  elements include review and identification of atypical events that could affect
				  distributed water quality or indicate that distributed water quality was
				  impaired; changes in distribution system maintenance and operation that could
				  affect distributed water quality (including water storage); source and
				  treatment considerations that bear on distributed water quality, where
				  appropriate (for example, whether a ground water supply is disinfected);
				  existing water quality monitoring data; and inadequacies in sample sites,
				  sampling protocol, and sample processing. The department shall conduct the
				  assessment tailoring specific assessment elements with respect to the size and
				  type of the supply and the size, type, and characteristics of the distribution
				  system. The supply shall comply with any expedited actions or additional
				  actions required by the department in the case of an E. coli MCL
				  violation.
(u) "License" means the
				  license that is issued by the department to a water hauler, or for a water
				  hauling tank, under section 18 of the act.
(v) "Limited treatment system" means a
				  treatment system, including, but not limited to, disinfection, fluoridation,
				  iron removal, ion exchange treatment, phosphate application, or filtration
				  other than complete treatment.
(w)
				  "Living unit" means a house, apartment, or other domicile occupied or intended
				  to be occupied on a day-to-day basis by an individual, family group, or
				  equivalent.
(x) "Locational running
				  annual average (LRAA)" means the average of sample analytical results for
				  samples taken at a particular monitoring location during the previous 4
				  calendar quarters.