CWD Quality Assurance & Improvement 2

Question 1

Which document serves as the primary reference for well construction quality standards in most U.S. states?

Accepted Answer

ANSI/NGWA-01

Answer

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?

Accepted Answer

A void or lost circulation zone is present

Answer

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?

Accepted Answer

To document formation changes, drilling parameters, and observations for future reference

Answer

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?

Accepted Answer

Specific capacity (gpm per foot of drawdown)

Answer

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?

Accepted Answer

Electromagnetic casing inspection log

Answer

Electromagnetic casing inspection logs detect metal loss, corrosion, and wall anomalies by measuring changes in the electromagnetic field around the casing.

(CWD) Certified Well Driller Practice Test

(CWD) Certified Well Driller Practice Test

CWD Quality Assurance & Improvement 2