Exam (elaborations)
2024 TREEO DRINKING WATER TREATMENT C EXAM WITH CORRECT ANSWERS
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2024 TREEO DRINKING WATER TREATMENT C EXAM WITH CORRECT ANSWERS
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2024 TREEO DRINKING WATERTREATMENT C EXAM WITH
CORRECT ANSWERS
Iron Secondary MCL (affects aesthetic quality) - CORRECT-ANSWERS0.3 mg/l
(red water complaints)
HAA5 MCL - CORRECT-ANSWERS0.060 mg/l
What does the application of sodium hexametaphosphate to the feedwater of
an RO membrane help? - CORRECT-ANSWERSDecrease the amount of
calcium sulfate precipitation on the membrane
The increasing tendency for precipitation of sparingly soluble salts and
deposition of particulate matter on the membrane surface is called -
CORRECT-ANSWERSConcentration polarization
Why are acids commonly fed into the feedwater of an RO unit? - CORRECT-
ANSWERSTo protect membranes from damage by hydrolysis
Brackish water is forced through the membrane with how much pressure and
using what kind of pump? - CORRECT-ANSWERS200-500 psi & Centrifugal
pump
Seawater is forced through the membrane with how much pressure? -
CORRECT-ANSWERS500-1200 psi & Positive Displacement pump
During RO Treatment which valve are NEVER to be fully closed while in
operation? - CORRECT-ANSWERSBrine or Reject
How can concentration polarization be minimized? - CORRECT-
ANSWERSIncreasing flow velocity
What is an instrument used to measure the color intensity of a chemical
solution called? - CORRECT-ANSWERSA spectrophotometer
What is the main instrument used in the Threshold Odor Number analysis? -
CORRECT-ANSWERSThe human nose
What is the antidote for all acid spills? - CORRECT-ANSWERSNeutralization
, Why is sodium thiosulfate added to sample bottles or sample bags used for
total coliform testing? - CORRECT-ANSWERSSodium Thiosulfate neutralizes
all chlorine residual present
What is the correct procedure to make a dilution of concentrated sulfuric
acid? - CORRECT-ANSWERSSlowly add the required amount of acid into the
dilution water, inside a lab fume hood
An operator could have their license permanently revoked for doing what? -
CORRECT-ANSWERSFalsified or misrepresented reports, logs or lab sheets
How often are radionuclide monitoring samples collected? - CORRECT-
ANSWERSEvery 3 years
Who developed the SDWA (safe drinking water act)? - CORRECT-
ANSWERSEPA
Public or privately owned systems are defined as... - CORRECT-ANSWERSAt
least 15 connections/Serve at least 25 people 60 days out of the year
Bacteriological sample analysis results must be kept for how long? -
CORRECT-ANSWERS5 years
Physical, Chemical & Radiological sample analysis results must be kept for
how long? - CORRECT-ANSWERS10 years
Monthly Operational Reports (MORs) must be kept for how long? - CORRECT-
ANSWERS10 years
What is the code of federal regulation for Lead and Copper? - CORRECT-
ANSWERS40 CFR 141, subpart 1
When are Consumer Confidence Reports (CCR) Reports due? - CORRECT-
ANSWERSJuly 1st
What procedure should be followed if actual or suspected sabotage, security
breach or any suspicious incident involving a public water system? -
CORRECT-ANSWERSCall the State Warning Point within 2 hours
Tier 1 public notification of primary contaminant violation must notify the
public when and how? - CORRECT-ANSWERSASAP/no later than 24 hours by
radio and TV station
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