front 1 What is potentially the most hazardous situation to deal with at a water plant? | back 1 A chemical spill |
front 2 What is the recommended finished water target turbidity level? | back 2 0.1 NTU |
front 3 These metallic elements can cause staining of plumbing fixtures and clothes | back 3 Iron and manganese |
front 4 What is the goal of all water plants? | back 4 To produce a filtered water with the lowest practical level of turbidity |
front 5 Most accidents at a water treatment plant are the result of what? | back 5 Carelessness and/or negligence |
front 6 The treatment of water may depend on factors such as the impurities in the raw water source, the finished water quality standards, the demand for the water by the community and what other condition? | back 6 Treatment cost considerations |
front 7 What is the MCL for radium 226 & 228? | back 7 5 pCi/L |
front 8 What is the secondary MCL for iron? | back 8 0.3 mg/L |
front 9 What is the purpose of adding a coagulant, like aluminum sulfate (alum), to the raw water? | back 9 To help remove light, fine particles from the water |
front 10 What are sources of water for a water treatment plant? | back 10 A stream, river or well |
front 11 What are the three major water quality indicators that effect the efficiency of copper sulfate as an algicide? | back 11 •Alkalinity, algae species, and outdoor temperature •pH, chlorine residual and conductivity •Alkalinity, settleable solids and chlorine demand •Water temperature, suspended matter and alkalinity |
front 12 Items essential to a sanitary survey include identification of potential hazards, the determination of factors that affect water quality and which other condition? | back 12 •The selection of treatment requirements •The demand of the finished water product •The amount of process waste products •Hiring of qualified operators |
front 13 A condition where surface waters warm rapidly, expand, and become lighter than the lower, colder waters is called? | back 13 Thermal stratification |
front 14 According to the SDWA, a Public Water System is one that: | back 14 Has at least 15 service connections and serves an average of 25 people daily for at least 60 days per year |
front 15 If a lake has a surface area of 5 acres, what is the surface area as square feet? | back 15 217,800 sq ft |
front 16 Convert 9,785,500 cubic feet to gallons | back 16 73,195,540 gallons |
front 17 Aeration and Re-aeration are methods of what? | back 17 Reservoir destratification |
front 18 A disagreeable rotten egg odor noticed in a groundwater source is caused by what? | back 18 Hydrogen sulfide |
front 19 How many Nephelometric Turbidity Units (NTU) will produce a water that is usually objectionable for aesthetic reasons? | back 19 5.0 NTU |
front 20 Soft water, turbidity, suspended solids and microbial contamination are characteristics of what raw water source? | back 20 Surface water |