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WASTEWATER OPERATOR CLASS C CERTIFICATION EVALUATION EXAMS 2026 FULL QUESTIONS AND SOLUTIONS

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WASTEWATER OPERATOR CLASS C CERTIFICATION EVALUATION EXAMS 2026 FULL QUESTIONS AND SOLUTIONS

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WASTEWATER OPERATOR CLASS C
CERTIFICATION EVALUATION EXAMS 2026
FULL QUESTIONS AND SOLUTIONS



◉ What is a wastewater operator supposed to do? Answer: Protect the
downstream users



◉ Characteristics of wastewater. Answer: Grayish appearance

Musty odor

6.8-7.2 pH

200-250mg/l BOD5

200-250 mg/l TSS



◉ Disinfection. Answer: The process of killing pathogenic (disease
causing) organisms



◉ Sterilization. Answer: The process of killing all organisms in a water
sample

, ◉ National Pollutant Discharge Elimination System (NPDES). Answer:
Federal or state agency responsible for control of pollutant discharges



◉ Inflow & Inflitration. Answer: Water that enters into the collection
and treatment system from sources other that service connections



◉ Area of a circle. Answer: 3.14xrxr



◉ Volume of a cylinder. Answer: 3.14 x r x r x h or d



◉ Weight of a gallon. Answer: 8.34lbs



◉ Gallons in 1 cubic foot. Answer: 7.48 gallons



◉ 1%. Answer: 10,000 PPM (Parts per million)



◉ Circumference of a circle. Answer: 2(3.14)r or 3.14d



◉ Area of a trapezoid. Answer: (B1+B2)/2 x A



◉ Area of a circle. Answer: (3.14)(r)(r)
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