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AWWA ABC Water Distribution Grades 1 & 2 Exam 2024
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AWWA ABC Water Distribution Grades 1 & 2 Exam 2024 ...
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AWWA ABC Water Distribution Grades 1 & 2 Exam 2024 Which agency sets legal limits on the concentration levels of harmful contaminants in potable water distributed to customers? - ANSWER US Environmental Protection Agency The number of monthly distributions system bacteriologiacal samples required is - ANSWER Based on the population served What is the maximum contaminant level for total trihalomethanes (TTHM) in the united States? - ANSWER 0.080 mg/L Under the Surface Water Treatment Rule, disinfection residuals must be collected at the same location in the distribution system as - ANSWER coliform samples Iron can cause "red water" and thus customer complaints when its concentration is above its secondary maximum contaminant level of - ANSWER 0.30 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. - ANSWER State What is the objective of Total Coliform Rule? - ANSWER To 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 ? - ANSWER EPA Explain the difference between the different tiers of violations. Which tier is the most serious? - ANSWER Tier 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? - ANSWER 24 hours How is the required number of monthly bacteriological samples determined? - ANSWER Population served What is the action level for lead in first-draw samples taken from customer taps? - ANSWER 0.015 mg/L A water system is designated a community public water system if it serves how many homes? - ANSWER 15 or more What authority provides specific water sampling instructions? - ANSWER The state primacy agency According to the Lead and Copper Rule, what is the action level for lead? - ANSWER 0.015 mg/L Head is measured in - ANSWER Feet A plat is - ANSWER a map At which time of the day is the age of the water stored in the distribution system the highest? - ANSWER Early morning Water mains should primarily be sized based on - ANSWER adequate fire flow at an appropriate pressure The most desirable residential pressure ranges from - ANSWER 50 to 75 psi (345 to 517kPa) Domestic water use includes water that is supplied to residential areas, ____________, and institutional facilities. - ANSWER commercial districts Riparian doctrine is sometimes called the "rule of - ANSWER reasonable sharing." During which season is water typically the highest? - ANSWER summer Of the common types of distribution system, which type is considered least desirable? - ANSWER Tree system The velocity of water is calculated as the quantity of water that flows through a pipe - ANSWER divided 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? - ANSWER Gage pressure In hydraulics, how is head expressed? - ANSWER ft-pounds per pound What is the term for pressure measured in terms of the height of water ( in meters or feet)? - ANSWER Head What are three types of head? - ANSWER Elevation head velocity head pressure head The highest degree of protection for the exterior of a coating steel pipe is - ANSWER Cathodic protection The C value is a measure of a pipe wall's - ANSWER roughness, which retards flow due to friction. Type of joint for ductile iron piping? - ANSWER Push-on joint What is the term for a sudden repeated increase and decrease inVoordelen van het kopen van samenvattingen bij Stuvia op een rij:
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