Michigan Administrative Code › Department - Environmental Quality › Drinking Water And Municipal Assistance Division › Supplying Water to the Public › Part 7 - SURVEILLANCE, INSPECTION, AND MONITORING › Section R. 325.10717 - Collection and analysis of samples for synthetic organic chemicals

Current through Vol. 24-12, July 15, 2024
Rule 717.
(1)
				  Suppliers of community and nontransient, noncommunity water supplies shall
				  collect samples and cause analyses to be made under this rule for synthetic
				  organic chemicals to determine compliance with the state drinking water
				  standards in R 325.10604d. Each supplier shall monitor at the time designated
				  by the department within each compliance period.
(2) A groundwater supplier shall take at
				  least 1 sample at every entry point to the distribution system that is
				  representative of each well after treatment, also known as sampling point. Each
				  sample shall be taken at the same sampling point unless conditions make another
				  sampling point more representative of each source or treatment plant.
(3) A surface water supplier, or combined
				  surface water and ground water, shall take at least 1 sample at points in the
				  distribution system that are representative of each source or at each entry
				  point to the distribution system after treatment, also known as sampling point.
				  Each sample shall be taken at the same sampling point unless conditions make
				  another sampling point more representative of each source or treatment
				  plant.
(4) If a system draws water
				  from more than 1 source and the sources are combined before distribution, then
				  the supplier shall sample at an entry point to the distribution system during
				  periods of normal operating conditions when water that is representative of all
				  sources is being used.
(5) Each
				  community and nontransient, noncommunity water supplier shall take 4
				  consecutive quarterly samples for each contaminant in R 325.10604d during each
				  compliance period beginning with the initial compliance period.
(6) A supplier serving more than 3,300 people
				  that does not detect a contaminant in the initial compliance period may reduce
				  the sampling frequency to not fewer than 2 quarterly samples in 1 year during
				  each repeat compliance period.
(7)
				  A supplier serving fewer than 3,301 people that does not detect a contaminant
				  in the initial compliance period may reduce the sampling frequency to at least
				  1 sample during each repeat compliance period.
(8) Each community and nontransient water
				  supply may apply to the department for a waiver from the requirements of
				  subrule (5), (6), or (7) of this rule.A supplier shall reapply for a waiver for
				  each compliance period.
(9) The
				  department may grant a waiver if a determination by the department does not
				  reveal previous use, including transport, storage, or disposal, of the
				  contaminant within the watershed or zone of influence. If previous use of the
				  contaminant is unknown or if the contaminant has been used previously, then all
				  of the following factors shall be used to determine whether a waiver is
				  granted:
(a) Previous analytical
				  results.
(b) The proximity of the
				  system to a potential point or non-point source of contamination. Point sources
				  include spills and leaks of chemicals at or near a water treatment facility, at
				  manufacturing, distribution, or storage facilities or from hazardous and
				  municipal waste-handling or treatment facilities. Non-point sources include the
				  use of pesticides to control insect and weed pests in agricultural areas,
				  forest lands, homes, and gardens and also include other land application
				  uses.
(c) The environmental
				  persistence and transport of the pesticide or PCBs.
(d) How well the water source is protected
				  against contamination due to factors such as depth of the well, the type of
				  soil, and the integrity of the well casing.
(e) Elevated nitrate levels at the water
				  supply source.
(f) Use of PCBs in
				  equipment that is used in the production, storage, or distribution of
				  water.