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. 325.10716 - Collection and analysis of samples for VOCs

Current through Vol. 24-12, July 15, 2024
Rule 716.
(1)
				  Beginning with the initial compliance period, suppliers of community and
				  nontransient, noncommunity water supplies shall collect samples and cause
				  analyses to be made under this rule for volatile organic chemicals to determine
				  compliance with the state drinking water standards in R 325.10604b. Each
				  supplier shall monitor at the time designated by the department within each
				  compliance period. The department may increase required monitoring where
				  necessary to detect variations within a water system.
(2) For transient, noncommunity and type III
				  public water supplies, the department may require samples to be collected and
				  analyzed at prescribed frequencies for organic chemicals.
(3) Suppliers of groundwater systems 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, treatment plant, or within
				  the distribution system.
(4)
				  Suppliers of surface water systems or combined surface water and groundwater
				  systems 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, treatment plant, or within the distribution
				  system.
(5) If the system draws
				  water from more than 1 source and the sources are combined before distribution,
				  then the system shall be sampled 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.
(6)
				  Suppliers of each community and nontransient, noncommunity water system shall
				  take 4 consecutive quarterly samples for each contaminant, except for vinyl
				  chloride, in R 325.10604b during each compliance period, beginning in the
				  initial compliance period. Suppliers that use grandfathered samples and that
				  did not detect any VOCs in R 325.10604b, shall, beginning with the initial
				  compliance period, monitor annually under subrule (7) of this rule.
(7) If a supplier does not detect a
				  contaminant in R 325.10604b in the first of the 4 consecutive quarterly
				  samples, then the supplier shall take 1 sample annually beginning with the
				  initial compliance period.
(8)
				  After a supplier has performed annual sampling for not less than 3 years, the
				  department may allow a groundwater supplier that has not previously detected
				  any contaminant in R 325.10604b to reduce monitoring to 1 sample during each
				  compliance period.
(9) Suppliers of
				  each community and nontransient noncommunity groundwater system that do not
				  detect, at or above 0.0005 milligrams per liter, a contaminant in R 325.10604b
				  may apply to the department for a waiver from portions of the requirements of
				  subrules (6) and (7) of this rule after completing the initial monitoring. A
				  waiver shall be effective for not more than 6 years. The department may also
				  issue waivers to small systems for the initial round of 1,2,4 trichlorobenzene
				  monitoring.
(10) The following
				  factors shall be evaluated to determine if a waiver may be granted:
(a) Knowledge of previous use, including
				  transport, storage, or disposal, of the contaminant within the watershed or
				  zone of influence of the system.If a determination by the department reveals no
				  previous use of the contaminant within the watershed or zone of influence, then
				  a waiver may be granted.
(b) If
				  previous use of the contaminant is unknown or the contaminant has been used
				  previously, then all of the following factors shall be used to determine
				  whether a waiver is granted:
(i) Previous
				  analytical results.
(ii) 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 or at manufacturing, distribution, or storage
				  facilities or from hazardous and municipal waste landfills and other
				  waste-handling or treatment facilities.
(iii) The environmental persistence and
				  transport of the contaminants.
(iv)
				  The number of persons who are served by the public water system and the
				  proximity of a smaller system to a larger system.
(v) How well the water source is protected
				  against contamination, such as whether it is a surface water or groundwater
				  system. Groundwater supplies shall consider factors such as depth of the well,
				  the type of soil, and wellhead protection. Surface water supplies shall
				  consider watershed protection.