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AWWA WSO Water Treatment Grades 3&4 Questions and Answers Fully Solved
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AWWA WSO Water Treatment Grades 3&4
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AWWA WSO Water Treatment Grades3&4
Which disinfectant would work best against cryptosporidium? - answer Ozone
The pH of a water sample is greater that the pHs so the Langlier index? - answer
Indicates the water is scale forming.
When water high in calcium bicarbonate is softened by ion exchange - answer Sodium
bicarbonate remains in the product water.
Lime softening can effectively disinfect water because: - answerThe pH level is higher
than 10.5
A noncarbonate hardness compound is - answerMgSO4
What term refers to the reintroduction of carbon dioxide into water either during or after
lime-soda ash softening? - answerRecarbonation
___________ is the oxidation of unprotected metal surfaces. - answerCorrosion
What is the cause of carbonate hardness? - answerCalcium Bicarbonate
Which two ions are most commonly associated with water hardness? - answerCalcium
and Magnesium
For noncarbonate hardness to be removed, what must be added to remove the
noncarbonated calcium compounds? - answerSoda Ash
If a water system collects at least 40 samples per month for the analyses of total
coliforms, what percentage of total coliform positive samples are acceptable for the
system to remain in compliance with the maximum contaminant level for total coliforms?
- answerNo more than 5%
Water systems are required to achieve at least ____________ removal and/or
inactivation of viruses between a point where the raw water is not subject to
recontamination by surface water runoff and a point downstream before or at the first
customer. - answer4 log
, Where are the sampling points located for required sampling of organics (except
trihalomethanes) in a community water system? - answerEntry points to the distribution
system
Where are the sampling point(s) located for required sampling of natural radionuclides
in a community water system? - answerEach entry point to the system
Continuous chlorine residual monitoringis required where the water enters the
distribution system under the Surface Water Treatment Rule when the -
answerpopulation served is >3,300 people.
A community water system must post the Consumer Confidence Report on a publicly
accessible website if it serves more than - answer100,000 people.
Public water systems that cannot meet the required removal of total organic compounds
(TOCs) can comply if the source-water TOC level is __________, calculated quarterly
as a running annual average. - answer<2.0 mg/L
The Surface Water Treatment Rule does not specify which of the following treatment
technology? - answerChloramine disinfection
A regulated organic contaminant concentration that exceeds the MCL - answeris a Tier
2 violation requiring public notification within 30 days.
Operators must balance satisfying regulations on the amount of certain chlorinated
organic compounds with - answermeeting disinfection limits.
A water system using conventional filtration treatment does not have to use enhanced
coagulation to achieve the total organic carbon (TOC) percent removal if - answerthe
treated water quarterly running average TOC is less than 2.0 mg/L.
The Stage 1 DBPR established an MCL of __________ for TTHM (total
trihalomethanes). - answer0.08 mg/L
The Safe Drinking Water Act defines a public water system as a supply of piped water
for human consumption that has at least ________ service connections, or serves
_________ or more persons 60 or more days each year. - answer15; 25
Under the enhanced coagulation requirements of the DBPR, treatment plants must
remove specific percentages of total organic carbon based on their source water total
organic carbon and what other factor? - answerAlkalinity levels
The Filter Backwash Recycle Rule applies to what sizes of systems? - answerAll sizes
Which rule most directly guards against the presence of Escherichia coli (E-coli) in the
water supply? - answerTotal Coliform Rule
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