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Which criteria must a domestic water supply meet to be considered of good quality?
1. Free of toxic chemicals
2. Free of disease causing organisms
3. Will satisfy, to a maximum degree, the requirements of domestic and industrial
consumers
4. Of such a chemical composition that it may be distributed without undue corrosive
or scale forming effects on the water distribution system
5. Attractive in tasted and appearance
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1. Free of toxic chemicals
2. Free of disease causing organisms
3. Will satisfy, to a maximum degree, the requirements of domestic and
industrial consumers
4. Of such a chemical composition that it may be distributed without undue
corrosive or scale forming effects on the water distribution system
5. Attractive in tasted and appearance
,Which factors may cause water quality degradation?
1. dead ends
2. biological growth and activity
3. time in the system
4. cross-connections
5. corrosion
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1. dead ends
2. biological growth and activity
3. time in the system
4. cross-connections
5. corrosion
Why have drinking water quality standards been prepared and used?
1. to determine the capacity of water storage facilities
2. to ensure that pumps deliver water at all times
3. to provide the needed quality control and ensure the acceptability of the product
4. to require laboratories to develop detailed procedures
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3. to provide the needed quality control and ensure the acceptability of the
product
How can chemicals used at water treatment facilities cause water quality problems?
1. Excessive use of manganese compounds for taste and odor control results in a
, colored water
2. Adding alkalinity for coagulation creates corrosive waters
3. Overdosing alum during coagulation treatment results in turbidity and deposits
4. Chlorinating water containing organic materials results in the formation of THM's
5. Improper chlorination causes objectionable tastes and odors
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1. Excessive use of manganese compounds for taste and odor control
results in a colored water
3. Overdosing alum during coagulation treatment results in turbidity and
deposits
4. Chlorinating water containing organic materials results in the formation
of THM's
5. Improper chlorination causes objectionable tastes and odors
How can water in below ground reservoirs be subject to contamination?
1. From inspection by operators
2. From flooding by surface stormwaters
3. From windblown contamination
4. From materials that enter through failures in the side walls
5. From vandalism
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2. From flooding by surface stormwaters
3. From windblown contamination
4. From materials that enter through failures in the side walls
5. From vandalism
Under what conditions may water mains be located adjacent to sewer lines?