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CWEA - Lab Analyst III Test Questions & 100% Correct Answers
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CWEA - Lab Analyst III Test Questions& 100% Correct Answers
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? - ✔✔6,684 cu ft/day
Which of the following formulas determines chlorine demand? - ✔✔Chlorine dose - chlorine
residual = chlorine demand
What is the most important measurable parameter to judge the performance of an anaerobic sludge
digester? - ✔✔Volatile solids reduction
What is a multicopy shipping document that accompanies hazardous waste shipments called? -
✔✔Manifest
The HAZWOPER Standard, 29 CFR 1910.120 addresses which of the following situations? -
✔✔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: -
✔✔ignitability, corrosivity, reactivity, and toxicity.
Performance standards do not place emphasis on which of the following? -
✔✔Personality characteristics
Of the following inquiries during an interview, which one is appropriate? - ✔✔"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? - ✔✔$11.62 /test
The lower warning limit (LWL) on an LCS control chart indicates: - ✔✔The recovery which is
two standard deviations below the average recovery.
When two of three successive determinations fall outside the warning limits: - ✔✔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? - ✔✔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? - ✔✔Collect in fluoropolymer bottle and preserve with HCl within 48 hours.
Alkalinity - Bottle, Preservation, Hold Time - ✔✔250mL plastic/glass, unpres, 14 days
1,4 Dioxane - Bottle, Preservation, Hold Time - ✔✔500ml amber, sulfite/bisulfate, 28 days
Ammonia - Bottle, Preservation, Hold Time - ✔✔500ml plastic/glass, pH<2 H2SO4, 28 days
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