11 PROPOSED ADMINISTRATIVE RULES

 

 

ORR # 2002-024

 

DEPARTMENT OF ENVIRONMENTAL QUALITY DRINKING WATER AND RADIOLOGICAL PROTECTION DIVISION

SUPPLYING WATER TO THE PUBLIC

 

Filed with the Secretary of State on

These rules take effect 7 days after filing with the Secretary of State

 

(By authority conferred on the department of  environmental  quality  by  sections  5,  7,  14,  and 19  of 1976 PA 399, MCL 325.1005, 325.1007, 325.1014, and 325.1019, and Executive Reorganization Order

No. 1996-1, MCL 330.3101)

 

R 325.11002 and R 325.11008 of the Michigan Administrative Code are amended and R325.11004 and R 325.11009 of the Code are rescinded as follows:

 

PART 10. TREATMENT SYSTEMS AND PUMPING FACILITIES

 

R 325.11002 Applicability; approval of deviations from minimum standards and requirements.

Rule 1002. (1) The provisions of this part apply to all public water supplies that utilize sources of water requiring complete treatment SUBPART H SYSTEMS, to certain other treatment systems, and to all water pumping facilities. These rules are standards and requirements which shall be considered by the department when issuing permits or approvals for waterworks systems.

(2)        Deviations from the minimum standards and requirements prescribed by this part may be approved by the department upon a showing by an owner of a public water supply that the deviation will not adversely affect public health.

(3)        Any deviations to the requirements for complete treatment of water sources shall not be in conflict with THESE RULES the provisions of 40 C.F.R. part 141 (June 29, 1989). For purposes of this subrule, the provisions of 40 C.F.R. part 141 (June 29, 1989) are adopted by reference. Copies of the adopted material may be obtained from the United States Environmental Protection Agency, Region V, Water Supply Branch, 230 South Dearborn Street, Chicago, Illinois 60604, at no cost, or from the Michigan Department of Public Health, Division of Water Supply, 3423 North Martin Luther King, Jr. Blvd., Lansing, Michigan 48909, at no cost.

 

R 325.11004 Rescinded. Treatment technique requirements for surface water sources and other sources.

Rule 1004. (1) A public water source shall be in compliance with the requirements of R 325.10807, R 325.10808, R 325.10812, R 325.10813, R 325.10816, R 325.10817, R 325.10818, R 325.10819, R

325.10820, and R 325.10822, shall demonstrate a safe microbiological water quality history, and may be

 

 

required to demonstrate stability in other measurements of water quality or the source shall be subjected to complete treatment.

(2)  The department may grant a deviation from the provisions of subrule (1) of this rule where a treatment system which includes filtration is demonstrated to be capable of producing finished water that meets the state drinking water standards. A system for which a deviation has been granted is considered a source of water that requires complete treatment for purposes of determining compliance with other rules.

(3)  All treatment systems for public water supplies that use a surface water source or any source of water that requires complete treatment shall provide sufficient disinfectant contact time at the rated treatment capacity before the water enters the distribution system to assure adequate disinfection. Beginning June 29, 1993, each public water system for which complete treatment is required shall provide disinfection treatment as follows:

(a)The disinfection treatment shall be sufficient to ensure that the total treatment processes of that system achieve not less than 99.9% (3-Log) inactivation or the removal of Giardia lamblia cysts and not less than 99.99% (4-Log) inactivation or the removal of viruses.

(b)           The residual disinfectant concentration in the water entering the distribution system, measured as specified in the approved analytical technique, shall not be less than 0.2 milligrams per liter for more than 4 hours.

(c)            The residual disinfectant concentration in the distribution system, measured as total chlorine, combined chlorine, or chlorine dioxide, as specified in the approved analytical technique, shall not be undetectable in more than 5% of the samples each month for any 2 consecutive months that the system serves water to the public. Water in the distribution system with a  heterotrophic bacteria concentration less than or equal to 500 per milliliter, measured as heterotrophic plate count (HPC) as specified in the approved analytical technique, is deemed to have a detectable disinfectant residual for purposes of determining compliance with this subdivision. (d) If the department determines, based on site-specific considerations, that a system does not have means for having a sample transported and analyzed for HPC by a certified laboratory under the requisite time and temperature conditions specified in the approved analytical technique and that the system is providing adequate disinfection in the distribution system, then the requirements of subdivision (c) of this subrule do not apply.

(4)  The requirements of this subrule become effective June 29, 1993. The level of representative samples from the plant tap shall be taken at regular intervals and shall not be more than 5 NTU. For systems that use conventional filtration, the turbidity level of representative samples of a system's filtered water shall be less than or equal to 0.5 NTU in not less than 95% of the measurements taken each month, except that if the department determines that the system is capable of achieving a Giardia lamblia removal rate of not less than 99.9% or the inactivation of Giardia lamblia cysts at some turbidity level higher than 0.5 NTU in not less than 95% of the measurements taken each month, the department may substitute this higher turbidity limit for that system. However, a turbidity limit shall not be more than 1 NTU in more than 5% of the samples taken each month. For systems that use slow sand filtration or diatomaceous earth filtration, the turbidity level of representative samples of a system's filtered water shall be less than or equal to 1 NTU in not less than 95% of the measurements taken each month; however, if the department determines, for a slow sand filtration system, that there is no significant interference with disinfection at a higher turbidity level, the department may substitute this higher turbidity limit for that system. A public water system may use a filtration technology other than conventional filtration, slow sand filtration, or diatomaceous earth filtration if the supplier demonstrates to the department, using pilot plant studies or other means, that the alternative filtration technology, in combination with disinfection treatment, consistently achieves a 99.9% removal rate of, or the inactivation of, Giardia lamblia cysts and a 99.99% removal rate of, or the inactivation of, viruses. The system shall meet the turbidity requirements of this subrule pertaining to slow sand filtration.

(5)  The owner or operator of a public water supply that is not excluded from the complete treatment requirements of subrule (1) of this rule shall provide complete treatment by June 29, 1993, or within 18 months

 

 

of the determination by the department that complete treatment is required, whichever is later. The supplier shall provide interim disinfection and monitoring as deemed necessary by the department. The supplier shall collect at least 1 sample near the first service connection for each day that the turbidity level of the source water is more than 1 NTU. The sample shall be analyzed for total coliform. When 1 or more turbidity measurements in any day are more than 1 NTU, the supplier shall collect the sample for coliform analysis within 24 hours of the first determination that a turbidity measurement is more than 1 NTU. Sample results from the coliform monitoring specified in this subrule shall be included in determining compliance with the total coliform standard.

(6)   Disinfection shall be provided for public water supplies that employ phosphate treatment systems or certain iron removal treatment systems.

 

R 325.11008 Complete treatment system; design and operation requirements.

Rule 1008. (1) A minimum of 2 units shall be provided for each treatment process for coagulation, sedimentation, and filtration.

(2)       A sufficient primary coagulant dose shall be added to create a settleable or filterable floc at all times that a complete treatment plant CONVENTIONAL FILTRATION or direct filtration plant is in operation.

(3)       Essential chemical systems for the application of disinfectants, primary coagulants, and other chemicals, as required by the department, shall be equipped to provide service at the maximum allowable treatment rate with the largest unit removed from service.

(4)       Equipment provided for disinfection required under subrule (3) of this rule shall be capable of treatment at the rated treatment capacity with the largest unit removed from service.

(5)      Application points for disinfection shall be provided, or be available, at all of the following locations:

(a)  Before coagulation.

(b)  Immediately preceding filtration.

(c) Immediately following filtration.

(d)  Immediately before entry of finished water into the distribution system.

(6)        Each unit or element of a complete treatment system shall be provided with a means to remove it from service without interrupting the treatment process. However, a complete bypass of the coagulation, sedimentation, or filtration processes is prohibited.

(7)        Each unit or element of a complete treatment system shall be provided with a means to drain and with overflow control sufficient to prevent flooding of the facility.

(8)       There shall be no Common walls between finished water and water of lesser quality ARE PROHIBITED.

(9)       Each complete treatment system shall be provided with a means to measure the volume and rate of raw water supplied and finished water produced.

(10)        A complete treatment system shall be protected from the highest recorded flood elevation or the 100-year flood elevation, whichever is greater.

(11)       Components of a complete treatment system which are essential for the protection of the public health and which are required for the production of drinking water on a continuous basis shall be protected from flooding.

 

R 325.11009 Rescinded. Treatment system operator.

Rule 1009. An operator certified in accordance with part 19 of these rules shall be present at all times during operation of the treatment processes at a complete treatment system or other treatment system using a surface water source.