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Certification Rules and Exam <br /> SYSTEM AND FACILITY CLASSIFICATION <br /> (Revision Proposed for Winter 1996) <br /> In accordance with iota Laws of 1971,Chapter 928 Nnnesota Statute,Section 115.71, <br /> persons in direct responsible charge of a water supply system must obtain a certificate from the <br /> water and wastewater operators advisory council in a class equal to or higher than the class of his <br /> or her system or facility. <br /> The classification of all public water supply systems is based on the degree of hazard to the <br /> public health,togetim with the type of plant and the population affected. The classification is <br /> based on the following rating values: <br /> ITEM POINTS <br /> A. Water Supply Source <br /> Q Groundwater <br /> 2. Surface water 15 <br /> B. Quality of Water Supply <br /> © Less than 1.0 Coliform per <br /> 100 ml(milliliters) (1� <br /> 2. 1.0 to 100 Coliform per 100 ml 4 <br /> 3. 100 to 1,000 Coliform per 100 ml 6 <br /> 4. 1,000 to 5,000 Coliform per 100 ml 8 <br /> 5. 5,000 to 20,000 Coliform per 100 ml 10 <br /> 6. More than 20,000 Coliform per 100 ml 12 <br /> C. Unit Treatment Proms <br /> 1. Groundwater Source <br /> (0 Aeration �2 <br /> b. Chemical Precipitation(Softening) 16 <br /> © Filtration other than after <br /> softening piss <br /> d. Ion Exchange 5 <br /> (0 Disinfection <br /> L Chemical Oxidation 2 <br /> Stabilization 2 <br /> Fluoridation Q <br /> i. Ammonia Addition 5 <br /> j. Taste and Odor Control 2 <br /> 2. Surface Water Source <br /> a. Aeration 2 <br /> b. Coagulation 10 <br /> c. Sedimentation 5 <br /> d. Filtration 10 <br /> e. Disinfection 5 <br /> f. Ion Exchange 5 <br />