CWEA - LAB ANALYST III EXAM QUESTIONS WITH
COMPLETE SOLUTIONS
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
Ammonia - Bottle, Preservation, Hold Time -- Answer ✔✔ 500ml plastic/glass, pH<2
H2SO4, 28 days
BNAS - Bottle, Preservation, Hold Time -- Answer ✔✔ 1L amber glass, sod thiosulfate,
7 days
COMPLETE SOLUTIONS
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
Ammonia - Bottle, Preservation, Hold Time -- Answer ✔✔ 500ml plastic/glass, pH<2
H2SO4, 28 days
BNAS - Bottle, Preservation, Hold Time -- Answer ✔✔ 1L amber glass, sod thiosulfate,
7 days
