Rules of Department of Natural Resources Division 60—Safe Drinking Water Commission Chapter 2—Definitions Title Page 10 CSR 60-2.010 Installation, Extension, Testing and Operation of Public Water Supplies (Rescinded October 11, 1979) ..................................................3 10 CSR 60-2.015 Definitions .......................................................................................3 10 CSR 60-2.020 Grants for Public Water Supply Districts, Sewer Districts, Rural Community Water Supply and Sewer Systems and Certain Municipal Sewer Systems (Moved to 10 CSR 60-13.010).............................7 ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 1 Secretary of State Chapter 2—Definitions 10 CSR 60-2 Title 10—DEPARTMENT OF liquids, gases, or other substances into the available technology must be at least as effec- NATURAL RESOURCES public water system from any source(s). tive as granular activated carbon. Division 60—Safe Drinking 2. Backflow hazard. Any facility which, 8. Beta particle. A particle, identical Water Commission because of the nature and extent of activities with an electron, emitted from the nucleus of Chapter 2—Definitions on the premises or the materials used in con- a radioactive element. nection with the activities or stored on the 9. Breakpoint chlorination. The point at 10 CSR 60-2.010 Installation, Extension, premises, would present an actual or potential which sufficient chlorine has been applied to Testing and Operation of Public Water health hazard to customers of the public water water to satisfy the chlorine demand which Supplies system or would threaten to degrade the water should result in a total chlorine residual of at (Rescinded October 11, 1979) quality of the public water system should least seventy-five percent (75%) free avail- backflow occur. able chlorine. AUTHORITY: section 192.615, RSMo Supp. A. Class I backflow hazard. A back- (C) Terms beginning with the letter C. 1973. Original rule filed Sept. 21, 1973, flow hazard which presents an actual or 1. Cartridge filters. Pressure-driven sep- effective Oct. 1, 1973. Rescinded: Filed May potential health hazard to customers of the aration devices that remove particulate matter 4, 1979, effective Oct. 11, 1979. public water system should backflow occur. larger than one (1) micrometer using an engi- A list of customer facilities, not all inclusive, neered porous filtration media. They are typ- considered to be Class I backflow hazards is 10 CSR 60-2.015 Definitions ically constructed as rigid or semi-rigid, self- included in 10 CSR 60-11.010. supporting filter elements housed in pressure B. Class II backflow hazard. A back- PURPOSE: This rule defines terms used in 10 vessels in which flow is from the outside of flow hazard which would threaten to degrade CSR 60. the cartridge to the inside. the water quality of the public water system 2. Certificate. The certificate of compe- (1) The terms used in 10 CSR 60 shall have should backflow occur. A list of customer tency issued by the department stating that a the meanings set forth in the Missouri Safe facilities, not all inclusive, considered to be person has met the requirements for the spec- Drinking Water Act, the federal Safe Class II backflow hazards is included in 10 ified operator classification of the certifica- Drinking Water Act and regulations, or this CSR 60-11.010. tion program under the provisions of 10 CSR rule, unless the context of the term clearly 3. Backflow prevention assembly. An 60-14.020. assembly designed to prevent the reverse flow requires otherwise. In the event of any con- 3. Certificate of examination. A certifi- of water or other substances from a customer flict or inconsistency, the more stringent def- cate issued to a person who passes a written facility back into the public water distribution inition shall apply. examination but does not meet the experience system. See also definitions of air-gap sepa- requirements for the classification of exami- ration, double check valve, and reduced pres- (2) Definitions. nation taken. sure principle backflow prevention assembly. (A) Terms beginning with the letter A. 4. Chief operator. The person designat- 4. Backflow prevention assembly tester. 1. Action level. The concentration of ed by the owner of a public water system to A person who utilizes recognized backflow lead or copper in water which determines, in have direct, on-site responsibility for the prevention assembly testing procedures to some cases, the treatment requirements, sys- operation of a water treatment plant or water tem modifications, public education, or other determine whether or not an assembly is distribution system, or both. requirements as specified by the department functioning properly. Requirements for back- 5. Chloramines. All amino or imino that a water system is required to complete. flow prevention assembly tester certification groups in which the hydrogen has been 2. Air-gap separation. A backflow pre- are in 10 CSR 60-11. replaced totally or in part by chlorine. vention assembly consisting of a physical sep- 5. Bag filters. Pressure-driven separa- 6. Class I backflow hazard. See back- aration between the free-flowing discharge tion devices that remove particulate matter flow hazard. end of a public water system pipeline and an larger than one (1) micrometer using an engi- open or nonpressurized receiving vessel. An neered porous filtration media. They are typ- 7. Class II backflow hazard. See back- approved air-gap separation shall be at least ically constructed of a non-rigid, fabric filtra- flow hazard. twice the diameter of the system pipe mea- tion media housed in a pressure vessel in 8. Coagulation. A process using coagu- sured vertically above the overflow rim of the which the direction of flow is from the inside lant chemicals and mixing by which colloidal vessel. In no case shall the distance be less of the bag to the outside. and suspended materials are destabilized and than one inch (1"). 6. Bank filtration. Water treatment pro- agglomerated into flocs. 3. Alpha particle. A particle identical cess that uses a well to recover surface water 9. Combined chlorine residual. That with a helium nucleus, emitted from the that has naturally infiltrated into ground portion of the total chlorine residual which is nucleus of a radioactive element. water through a river bed or bank(s). not free available chlorine. 4. Applicant. The legal name of the pub- Infiltration is typically enhanced by the 10. Combined distribution system. The lic water system for purposes of 10 CSR-60. hydraulic gradient imposed by a nearby interconnected distribution system consisting 5. Auxiliary intake. Any piping, connec- pumping water supply or other well(s). of the distribution systems of wholesale sys- tion, or device whereby water may be secured 7. Best available technology. The best tems and of the consecutive systems that from a source other than the primary source. technology, treatment, or other means which receive finished water. 6. Auxiliary water system. Any supply the department finds, after examination for 11. Community water system. A public or source of water other than the approved efficacy under field conditions and not solely water system which serves at least fifteen public water system. under laboratory conditions, are available (15) service connections and is operated on a (B) Terms beginning with the letter B. (taking cost into consideration). For the pur- year-round basis or regularly serves at least 1. Backflow. The undesirable reversal of pose of setting maximum contaminant levels twenty-five (25) residents on a year-round flow of water or mixtures of water and other for synthetic organic chemicals, any best basis. ROBIN CARNAHAN (9/30/09) CODE OF STATE REGULATIONS 3 Secretary of State 10 CSR 60-2—DEPARTMENT OF NATURAL RESOURCES Division 60—Safe Drinking Water Commission 12. Compliance cycle. The nine (9)-year lowed by secondary rapid mix, flocculation, fectant concentration (C) is measured as calendar year cycle during which public water and sedimentation, operated in series, fol- determined by a department-approved study systems must monitor. Each compliance cycle lowed by filtration and disinfection contact as outlined in the Missouri Guidance Manual consists of three (3), three (3)-year compli- storage. Raw water quality characteristics for Surface Water System Treatment ance periods. The first calendar year cycle may require additional treatment. Requirements, 1992. begins January 1, 1993 and ends December 20. Corrosion inhibitor. A substance 6. Disinfection. A process which inacti- 31, 2001; the second begins January 1, 2002 capable of reducing the corrosivity of water vates pathogenic organisms in water by chem- and ends December 31, 2010; and the third toward metal plumbing materials, especially ical oxidants or equivalent agents. begins January 1, 2011 and ends December lead and copper, by forming a protective film 7. Domestic or other nondistribution 31, 2019. on the interior surface of those materials. system plumbing problem. A coliform con- 13. Compliance period. A three (3)-year 21. Cross-connection. Any actual or tamination problem in a public water system calendar year period within a compliance potential connection or structural arrange- with more than one (1) service connection cycle. Each compliance cycle has three (3), ment between a public water system and any that is limited to the specific service connec- three (3)-year compliance periods. Within the other source or system through which it is tion from which the coliform-positive sample first compliance cycle, the first compliance possible to introduce into any part of the pub- was taken. period runs from January 1, 1993 to lic water system any used water, industrial 8. Dose equivalent. The product of the December 31, 1995; the second from January fluid, gas, or substance other than the intend- absorbed dose from ionizing radiation and 1, 1996 to December 31, 1998; and the third ed potable water with which the system is factors that account for difference in biologi- from January 1, 1999 to December 31, 2001.