Exam (elaborations)
AWWA ABC Water Distribution Grades 1 & 2 Questions and Answers
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AWWA ABC Water Distribution Grades 1 & 2
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AWWA ABC Water Distribution Grades 1&2
Which agency sets legal limits on the concentration levels of harmful contaminants in
potable water distributed to customers? - answerUS Environmental Protection Agency
The number of monthly distributions system bacteriologiacal samples required is -
answerBased on the population served
What is the maximum contaminant level for total trihalomethanes (TTHM) in the united
States? - answer0.080 mg/L
Under the Surface Water Treatment Rule, disinfection residuals must be collected at the
same location in the distribution system as - answercoliform samples
Iron can cause "red water" and thus customer complaints when its concentration is
above its secondary maximum contaminant level of - answer0.30 mg/L
The goal of the Surface Drinking Water Act is for each ________ to accept primary
enforcement responsibility (primacy) for the operation of the state's drinking water
program. - answerState
What is the objective of Total Coliform Rule? - answerTo promote routine surveillance of
distribution system water quality to search for fecal matter and/or disease-causing
bacteria
Which agency sets standards on the concentration levels of harmful contaminants in
drinking water? - answerEPA
Explain the difference between the different tiers of violations. Which tier is the most
serious? - answerTier 1 = 24 hours (most severe)
Tier 2= 30 days
Tier 3= 1 year
A positive E. Coli test must be reported to the primacy health agency within what time
period? - answer24 hours
How is the required number of monthly bacteriological samples determined? -
answerPopulation served
, What is the action level for lead in first-draw samples taken from customer taps? -
answer0.015 mg/L
A water system is designated a community public water system if it serves how many
homes? - answer15 or more
What authority provides specific water sampling instructions? - answerThe state
primacy agency
According to the Lead and Copper Rule, what is the action level for lead? - answer0.015
mg/L
Head is measured in - answerFeet
A plat is - answera map
At which time of the day is the age of the water stored in the distribution system the
highest? - answerEarly morning
Water mains should primarily be sized based on - answeradequate fire flow at an
appropriate pressure
The most desirable residential pressure ranges from - answer50 to 75 psi (345 to
517kPa)
Domestic water use includes water that is supplied to residential areas, ____________,
and institutional facilities. - answercommercial districts
Riparian doctrine is sometimes called the "rule of - answerreasonable sharing."
During which season is water typically the highest? - answersummer
Of the common types of distribution system, which type is considered least desirable? -
answerTree system
The velocity of water is calculated as the quantity of water that flows through a pipe -
answerdivided by the cross-sectional area of pipe
What is the term for water pressure in a main or in a container that is measured by a
gauge? - answerGage pressure
In hydraulics, how is head expressed? - answerft-pounds per pound
What is the term for pressure measured in terms of the height of water ( in meters or
feet)? - answerHead
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