CWEA LABORATORY ANALYST EXAM ALL
GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING
WITH A STUDY GUIDE AND KNOWLEDGE
CHECK FLASHCARDS | GUARANTEED PASS
/BRAND NEW!!
A plant serving a city of 50,000 population has an influent
settleable solids of 10 mL/L. If per capita contribution to
the plant flow is 100 gallons/day, how much sludge is
produced in the plant in cubic feet/day? -
....ANSWER...6,684 cu ft/day
Which of the following formulas determines chlorine
demand? - ....ANSWER...Chlorine dose - chlorine residual
= chlorine demand
What is the most important measurable parameter to
judge the performance of an anaerobic sludge digester? -
....ANSWER...Volatile solids reduction
,What is a multicopy shipping document that accompanies
hazardous waste shipments called? -
....ANSWER...Manifest
The HAZWOPER Standard, 29 CFR 1910.120 addresses
which of the following situations? -
....ANSWER...Requires documentation of training for the
handling of major spills and acutely hazardous materials
A waste is considered hazardous if it has at least one of the
following properties: - ....ANSWER...ignitability,
corrosivity, reactivity, and toxicity.
Performance standards do not place emphasis on which of
the following? - ....ANSWER...Personality characteristics
Of the following inquiries during an interview, which one
is appropriate? - ....ANSWER..."By whom were you
referred for a position here?"
,You are asked to determine the cost per test of the COD
analysis. Use the following information:
The base salary of an analyst is $30,000; employer paid
benefits add 35% to the base salary; administrative
overhead adds another 45% to the base salary; there are
10 paid holidays, 15 days paid vacation leave, and 12 days
paid sick leave per year; the hourly salary is determined by
dividing the monthly salary by 174. Each COD test
requires an average of 20 minutes of labor from sample
preparation to cleanup. Costs for chemicals, glassware, and
equipment use average $1.00 per test. Disposal costs
average $2000/year for reagents from 1,000 tests.
What is the total cost per test? - ....ANSWER...$11.62
/test
The lower warning limit (LWL) on an LCS control chart
indicates: - ....ANSWER...The recovery which is two
standard deviations below the average recovery.
When two of three successive determinations fall outside
the warning limits: - ....ANSWER...Another determination
should be made, and if it is within the warning limits no
action is needed.
, Which of the below statements is NOT correct when
collecting samples for the detection of mercury by EPA
245.1 or SM 3112B? - ....ANSWER...a. Collect in
polyethylene bottle and preserve with nitric acid and
measure within 2 weeks.
b. Collect in glass bottle and preserve with nitric acid and
measure within 28 days.
c. Collect in fluoropolymer bottle and preserve with nitric
acid and measure within 28 days.
d. All of the above are true.
Which of the below statements is correct when collecting
samples for the detection of mercury by EPA 1631? -
....ANSWER...Collect in fluoropolymer bottle and preserve
with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time -
....ANSWER...250mL plastic/glass, unpres, 14 days
1,4 Dioxane - Bottle, Preservation, Hold Time -
....ANSWER...500ml amber, sulfite/bisulfate, 28 days
GRADES 2025/2026 BANK | ACCURATE REAL
EXAM VERSIONS | CURRENTLY TESTING
WITH A STUDY GUIDE AND KNOWLEDGE
CHECK FLASHCARDS | GUARANTEED PASS
/BRAND NEW!!
A plant serving a city of 50,000 population has an influent
settleable solids of 10 mL/L. If per capita contribution to
the plant flow is 100 gallons/day, how much sludge is
produced in the plant in cubic feet/day? -
....ANSWER...6,684 cu ft/day
Which of the following formulas determines chlorine
demand? - ....ANSWER...Chlorine dose - chlorine residual
= chlorine demand
What is the most important measurable parameter to
judge the performance of an anaerobic sludge digester? -
....ANSWER...Volatile solids reduction
,What is a multicopy shipping document that accompanies
hazardous waste shipments called? -
....ANSWER...Manifest
The HAZWOPER Standard, 29 CFR 1910.120 addresses
which of the following situations? -
....ANSWER...Requires documentation of training for the
handling of major spills and acutely hazardous materials
A waste is considered hazardous if it has at least one of the
following properties: - ....ANSWER...ignitability,
corrosivity, reactivity, and toxicity.
Performance standards do not place emphasis on which of
the following? - ....ANSWER...Personality characteristics
Of the following inquiries during an interview, which one
is appropriate? - ....ANSWER..."By whom were you
referred for a position here?"
,You are asked to determine the cost per test of the COD
analysis. Use the following information:
The base salary of an analyst is $30,000; employer paid
benefits add 35% to the base salary; administrative
overhead adds another 45% to the base salary; there are
10 paid holidays, 15 days paid vacation leave, and 12 days
paid sick leave per year; the hourly salary is determined by
dividing the monthly salary by 174. Each COD test
requires an average of 20 minutes of labor from sample
preparation to cleanup. Costs for chemicals, glassware, and
equipment use average $1.00 per test. Disposal costs
average $2000/year for reagents from 1,000 tests.
What is the total cost per test? - ....ANSWER...$11.62
/test
The lower warning limit (LWL) on an LCS control chart
indicates: - ....ANSWER...The recovery which is two
standard deviations below the average recovery.
When two of three successive determinations fall outside
the warning limits: - ....ANSWER...Another determination
should be made, and if it is within the warning limits no
action is needed.
, Which of the below statements is NOT correct when
collecting samples for the detection of mercury by EPA
245.1 or SM 3112B? - ....ANSWER...a. Collect in
polyethylene bottle and preserve with nitric acid and
measure within 2 weeks.
b. Collect in glass bottle and preserve with nitric acid and
measure within 28 days.
c. Collect in fluoropolymer bottle and preserve with nitric
acid and measure within 28 days.
d. All of the above are true.
Which of the below statements is correct when collecting
samples for the detection of mercury by EPA 1631? -
....ANSWER...Collect in fluoropolymer bottle and preserve
with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time -
....ANSWER...250mL plastic/glass, unpres, 14 days
1,4 Dioxane - Bottle, Preservation, Hold Time -
....ANSWER...500ml amber, sulfite/bisulfate, 28 days
