CWD Quality Assurance & Improvement 2 — Questions and Answers
Question 1: Which document serves as the primary reference for well construction quality standards in most U.S. states?
- ASTM E2107
- AWWA A100
- ANSI/NGWA-01 (Correct answer)
- EPA Method 600
Correct answer: ANSI/NGWA-01
ANSI/NGWA-01 is the National Ground Water Association's standard for water well construction that most states reference for quality benchmarks.
Question 2: A driller notices that grout is returning to the surface unusually fast during tremie placement. What does this most likely indicate?
- The grout mix is too thick
- A void or lost circulation zone is present (Correct answer)
- The tremie pipe is set too deep
- The annular space is too narrow
Correct answer: A void or lost circulation zone is present
Rapid grout return often signals a void or fracture zone that accepted grout initially, then allowed it to bypass the annulus and return quickly.
Question 3: What is the purpose of a driller's log during quality assurance?
- To track employee hours on the job
- To document formation changes, drilling parameters, and observations for future reference (Correct answer)
- To record the client's payment schedule
- To list equipment maintenance intervals only
Correct answer: To document formation changes, drilling parameters, and observations for future reference
A driller's log provides a permanent record of subsurface conditions, casing depths, grouting, and construction details essential for QA verification.
Question 4: When conducting a pump test for quality assurance, which parameter is most critical for evaluating long-term well performance?
- Static water level before pumping
- Specific capacity (gpm per foot of drawdown) (Correct answer)
- Pump motor amperage draw
- Wellhead discharge pressure
Correct answer: Specific capacity (gpm per foot of drawdown)
Specific capacity relates yield to drawdown and provides a reliable indicator of aquifer productivity and well efficiency over time.
Question 5: Which type of casing inspection method uses electromagnetic technology to detect wall thickness and defects without removing the casing?
- Caliper log
- Gamma ray log
- Electromagnetic casing inspection log (Correct answer)
- Temperature log
Correct answer: Electromagnetic casing inspection log
Electromagnetic casing inspection logs detect metal loss, corrosion, and wall anomalies by measuring changes in the electromagnetic field around the casing.
Question 6: A well produces sand after the initial development period. Which QA corrective action is most appropriate first?
- Immediately abandon the well
- Increase pump rate to flush sand out
- Lower the pump intake above the perforated interval and re-develop (Correct answer)
- Add a gravel pack to the surface casing
Correct answer: Lower the pump intake above the perforated interval and re-develop
Repositioning the pump above the screened zone and redeveloping allows fines to be removed without over-pumping the formation.
Question 7: In a QA audit, what does a 'non-conformance report' (NCR) document?
- Employee performance reviews
- Deviations from specified standards, specifications, or procedures (Correct answer)
- Customer satisfaction surveys
- Equipment purchase orders
Correct answer: Deviations from specified standards, specifications, or procedures
An NCR formally records any instance where work or materials fail to meet the project's quality requirements, triggering corrective action.
CWD Quality Assurance & Improvement 2
Which document serves as the primary reference for well construction quality standards in most U.S. states?