Section R. 325.10717 - Collection and analysis of samples for synthetic organic chemicalsRule 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.(10) If a contaminant in R 325.10604d is detected in any sample, then all of the following provisions apply:(a) Each supply shall monitor quarterly at each sampling point that resulted in a detection. The department may decrease the quarterly monitoring requirement specified in this subrule if it has determined that the supply is reliably and consistently below the MCL. A groundwater supplier shall take not fewer than 2 quarterly samples and a surface water supplier shall take not fewer than 4 quarterly samples before this determination.(b) After the department determines that the supply is reliably and consistently below the MCL, the department may allow the supply to monitor annually. Supplies that monitor annually shall monitor during the quarter that previously yielded the highest analytical result.(c) A supplier that conducts 3 consecutive annual samples and does not detect a contaminant may apply to the department for a waiver as specified in subrule (9) of this rule.(d) If monitoring results in detection of 1 or more of the following contaminants, then subsequent monitoring shall analyze for all the following related contaminants: (iii) Aldicarb sulfoxide.(11) A supplier that violates R 325.10604d shall monitor quarterly. If not fewer than 4 quarterly samples show that the supply is in compliance and the department determines the supply is reliably and consistently below the MCL, then the supplier shall monitor at the frequency specified in subrule (10)(b) of this rule.(12) The department may require a confirmation sample for positive or negative results. If a confirmation sample is required, then the result shall be averaged with the first sampling result and the average shall be used for the compliance determination. The department may delete results of obvious sampling errors from this calculation.(13) The department may reduce the total number of samples a supplier is required to analyze by allowing the use of compositing. Composite samples from not more than 5 sampling points within the same system are allowed if the detection limit of the method used for the analysis is less than 1/5 of the MCL. Compositing of samples shall be done in the laboratory and shall be analyzed within 14 days of sample collection. Both of the following provisions apply to compositing: (a) If the concentration in the composite sample detects 1 or more contaminants in R 325.10604d, then the supplier shall take a follow-up sample within 14 days from each sampling point included in the composite and shall analyze the sample for that contaminant.(b) If duplicates of the original sample taken from each sampling point used in the composite are available, then the supplier may use these duplicates instead of resampling. Duplicates shall be analyzed and the results reported to the department within 14 days after completion of the composite analysis or before the holding time is exceeded, whichever is sooner.(14) If monitoring data that are collected after January 1, 1990, are generally consistent with the requirements of this rule, R 325.10604d, and R 325.10605, then the department may allow systems to use that data to satisfy the monitoring requirement for the initial compliance period.(15) To detect variations within a system, due to fluctuations in concentration due to seasonal use or changes in water source, the department may increase the required monitoring frequency.(16) A determination of compliance may be based upon analytical results and other information compiled by the department.(17) All new supplies or supplies that use a new source of water shall demonstrate compliance with the MCLs before serving water to the public. The supply shall also comply with the initial sampling frequencies specified by the department to ensure a supply can demonstrate compliance with the MCLs.Mich. Admin. Code R. 325.10717
1979 AC; 1984 AACS; 1989 AACS; 1993 AACS; 1994 AACS; 1998 AACS; 2000 AACS; 2005 AACS