WASTE WATER GRADE 2 EXAM 2025 WITH
ACTUAL CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY
GRADED A+|BRAND NEW!!|GUARANTEED
PASS|LATEST UPDATE
The USEPA SDWA National Primary Drinking Water Standard "secondary standards" are meant to
Optional Answers:
1. Limit levels of hazardous chemicals in drinking water to protect public health
2. Reduce taste and odor in drinking water
Reduce taste and odor in drinking water
Briefly explain how reverse osmosis purifies water
Reverse osmosis purifies waters by using a semi-permeable membrane and applying pressure on the
salt-water side to the fresh water side. Particles that have a higher charge, size, and weight will likely not
pass the semipermeable membrane.
An example treatment technology that restricts chemicals by structure includes
1. Membrane filtration
2. Activated carbon
3. Ion exchange
4. Sorption
Membrane filtration
The Eau Claire well field was contaminated with VOCs from:
1. Improperly discarded waste from manufacturing by Presto Industries in the 1980s
2. A contaminated superfund site
3. The Eau Claire drinking water treatment plant air stripper
4. Improperly discarded waste from the manufacturing of small arms and radar tubes in the 1940s
Improperly discarded waste from manufacturing by Presto Industries in the 1980s
Explain what the USEPA Contaminant Candidate List is
1|Page
, The USEPA Contaminant Candidate List is a list of biological and chemical contamination.
1.Not currently regulated in drinking water,
2.Anticipated to cause health effects,
3.Known to occur in public water systems, and
4.May require future regulation
Slide 16 from chemical containment slide.
Of the 12 chemicals found in the Eau Claire well field plume, how many are on the NPDWR list?
1. Twelve
2. Five
3. Eight
4. One
Five
Hazard identification is:
1. Figuring out what chemical you are concerned about
2. Using data from lab animal toxicity studies to calculate risk
3. Used to calculate intake rate
Figuring out what chemical you are concerned about
Dose-response is:
1. Used to calculate intake rate
2. Using data from lab animal toxicity studies to calculate risk
3. Figuring out what chemical you are concerned about
Using data from lab animal toxicity studies to calculate risk
Exposure assessment is:
1. Used to calculate intake rate
2. Figuring out what chemical you are concerned about
3. Using data from lab animal toxicity studies to calculate risk
Used to calculate intake rate
Calculate the hazard quotient (HQ) for each trichloroethylene concentration. Based on the HQs for each
[trichloroethylene] is there a risk?
-Assume the average person consumes 5L of water/day 350 days/yr for 60 years and weighs 50kg, what
is the intake rate of trichloroethylene?
-If someone's water consumption pre-air stripper matched these exposure scenarios were they at risk?
Intake rate (C x IR x EF x ED/ BW x AT) /RfD= HQ
1. 0.00002 mg/L and 0.013 mg/L
2. 5x10^-4 rfD
c= 0.00002 mg/L
2|Page
ACTUAL CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |FREQUENTLY TESTED
QUESTIONS AND SOLUTIONS |ALREADY
GRADED A+|BRAND NEW!!|GUARANTEED
PASS|LATEST UPDATE
The USEPA SDWA National Primary Drinking Water Standard "secondary standards" are meant to
Optional Answers:
1. Limit levels of hazardous chemicals in drinking water to protect public health
2. Reduce taste and odor in drinking water
Reduce taste and odor in drinking water
Briefly explain how reverse osmosis purifies water
Reverse osmosis purifies waters by using a semi-permeable membrane and applying pressure on the
salt-water side to the fresh water side. Particles that have a higher charge, size, and weight will likely not
pass the semipermeable membrane.
An example treatment technology that restricts chemicals by structure includes
1. Membrane filtration
2. Activated carbon
3. Ion exchange
4. Sorption
Membrane filtration
The Eau Claire well field was contaminated with VOCs from:
1. Improperly discarded waste from manufacturing by Presto Industries in the 1980s
2. A contaminated superfund site
3. The Eau Claire drinking water treatment plant air stripper
4. Improperly discarded waste from the manufacturing of small arms and radar tubes in the 1940s
Improperly discarded waste from manufacturing by Presto Industries in the 1980s
Explain what the USEPA Contaminant Candidate List is
1|Page
, The USEPA Contaminant Candidate List is a list of biological and chemical contamination.
1.Not currently regulated in drinking water,
2.Anticipated to cause health effects,
3.Known to occur in public water systems, and
4.May require future regulation
Slide 16 from chemical containment slide.
Of the 12 chemicals found in the Eau Claire well field plume, how many are on the NPDWR list?
1. Twelve
2. Five
3. Eight
4. One
Five
Hazard identification is:
1. Figuring out what chemical you are concerned about
2. Using data from lab animal toxicity studies to calculate risk
3. Used to calculate intake rate
Figuring out what chemical you are concerned about
Dose-response is:
1. Used to calculate intake rate
2. Using data from lab animal toxicity studies to calculate risk
3. Figuring out what chemical you are concerned about
Using data from lab animal toxicity studies to calculate risk
Exposure assessment is:
1. Used to calculate intake rate
2. Figuring out what chemical you are concerned about
3. Using data from lab animal toxicity studies to calculate risk
Used to calculate intake rate
Calculate the hazard quotient (HQ) for each trichloroethylene concentration. Based on the HQs for each
[trichloroethylene] is there a risk?
-Assume the average person consumes 5L of water/day 350 days/yr for 60 years and weighs 50kg, what
is the intake rate of trichloroethylene?
-If someone's water consumption pre-air stripper matched these exposure scenarios were they at risk?
Intake rate (C x IR x EF x ED/ BW x AT) /RfD= HQ
1. 0.00002 mg/L and 0.013 mg/L
2. 5x10^-4 rfD
c= 0.00002 mg/L
2|Page
