Section R. 325.10739a - Groundwater supply rules; compliance monitoringRule 739a.
(1) This subrule applies to existing groundwater sources. A groundwater supply that is not required to meet the source water monitoring requirements of R 325.10612, R 325.10612a, R 325.10739, this rule, or R 325.10739b for 1 or more groundwater sources because it provides not less than 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for 1 or more groundwater sources before December 1, 2009, shall notify the department in writing that it provides not less than 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for the specified groundwater source and begin compliance monitoring under subrule (3) of this rule by December 1, 2009. Notification to the department shall include engineering, operational, or other information that the department requests to evaluate the submission. If the groundwater supply subsequently discontinues 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for a groundwater source, the supply shall conduct groundwater source monitoring as required under R 325.10739.(2) This subrule applies to new groundwater sources. A groundwater supply that places a groundwater source in service after November 30, 2009, that is not required to meet the source water monitoring requirements of R 325.10612, R 325.10612a, R 325.10739, this rule, or R 325.10739b because the groundwater supply provides not less than 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for the groundwater source shall comply with all of the following: (a) The groundwater supply shall notify the department in writing that it provides not less than 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for the groundwater source. Notification to the department shall include engineering, operational, or other information that the department requests to evaluate the submission.(b) The groundwater supply shall conduct compliance monitoring as required under subrule (3) of this rule within 30 days of placing the source in service.(c) The groundwater supply shall conduct groundwater source monitoring under R 325.10739 if the groundwater supply subsequently discontinues 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer for the groundwater source.(3) This subrule applies to monitoring requirements. A groundwater supply subject to the requirements of R 325.10612a or subrule (1) or (2) of this rule shall monitor the effectiveness and reliability of treatment for that groundwater source before or at the first customer as follows:(a) Both of the following apply to chemical disinfection:(i) A groundwater supply that serves more than 3,300 people shall continuously monitor the residual disinfectant concentration using analytical methods adopted by reference in R 325.10605 at a location approved by the department and shall record the lowest residual disinfectant concentration each day that water from the groundwater source is served to the public. The groundwater supply shall maintain the department determined residual disinfectant concentration every day the groundwater supply serves water from the groundwater source to the public. If there is a failure in the continuous monitoring equipment, the groundwater supply shall conduct grab sampling every 4 hours until the continuous monitoring equipment is returned to service. The groundwater supply shall resume continuous residual disinfectant monitoring within 14 days.(ii) A groundwater supply that serves 3,300 or fewer people shall monitor the residual disinfectant concentration using analytical methods adopted by reference in R 325.10605 at a location approved by the department and record the residual disinfection concentration each day that water from the groundwater source is served to the public. The groundwater supply shall maintain the department determined residual disinfectant concentration every day the groundwater supply serves water from the groundwater source to the public. The groundwater supply shall take a daily grab sample during the hour of peak flow or at another time specified by the department. If any daily grab sample measurement falls below the department determined residual disinfectant concentration, the groundwater supply shall take follow-up samples every 4 hours until the residual disinfectant concentration is restored to the department determined level. Alternatively, a groundwater supply that serves 3,300 or fewer people may monitor continuously and meet the requirements of paragraph (i) of this subdivision.(b) A groundwater supply that uses membrane filtration to meet the requirements of R 325.10612, R 325.10612a and R 325.10739, this rule, and R 325.10739b shall monitor the membrane filtration process under all department specified monitoring requirements and shall operate the membrane filtration under all department specified compliance requirements. A groundwater supply that uses membrane filtration is in compliance with the requirement to achieve not less than 4-log removal of viruses when all of the following conditions are met: (i) The membrane has an absolute molecular weight cut off (MWCO), or an alternate parameter that describes the exclusion characteristics of the membrane, that can reliably achieve not less than 4-log removal of viruses.(ii) The membrane process is operated under department specified compliance requirements.(iii) The integrity of the membrane is intact.(c) A groundwater supply that uses a department approved alternative treatment to meet the requirements of R 325.10612, R 325.10612a and R 325.10739, this rule, and R 325.10739b by providing not less than 4-log treatment of viruses (using inactivation, removal, or a department approved combination of 4-log virus inactivation and removal) before or at the first customer shall comply with both of the following:(i) Monitor the alternative treatment under all department specified monitoring requirements.(ii) Operate the alternative treatment under all compliance requirements that the department determines to be necessary to achieve not less than 4-log treatment of viruses.(4) A groundwater supply that discontinues 4-log treatment of viruses under R 325.10612a (3) is subject to the source water monitoring requirements of R 325.10739.(5) Failure to meet the monitoring requirements of subrules (1) to (3) of this rule is a monitoring violation and requires the groundwater supply to provide public notification under R 325.10404.Mich. Admin. Code R. 325.10739a