ABC Field Test and Inspection Procedures 4

Question 1

When conducting a sanitary survey, which item represents a significant deficiency requiring immediate corrective action?

Accepted Answer

An uncovered finished water reservoir

Answer

An uncovered finished water reservoir is a direct pathway for contamination and a critical regulatory deficiency.

Question 2

What is the correct procedure when a field pH meter reading drifts more than 0.2 units during a calibration check?

Accepted Answer

Recalibrate the meter using fresh buffer solutions

Answer

Drift >0.2 pH units indicates calibration error; the meter must be recalibrated before any samples are measured.

Question 3

A sewer main inspection reveals root intrusion at multiple joints. The BEST long-term corrective measure is:

Accepted Answer

Cured-in-place pipe (CIPP) lining or joint replacement

Answer

Structural rehabilitation via CIPP or joint replacement eliminates the entry points that allow recurring root growth.

Question 4

During a pump station inspection, the inspector records a 10-minute pump runtime per cycle and a 5-minute off time. What is the pump duty cycle?

Accepted Answer

67%

Answer

Duty cycle = run time / (run time + off time) = 10 / 15 = 67%; excessive duty cycles indicate potential undersizing or inflow/infiltration.

Question 5

What does a negative pressure reading on the suction side of a centrifugal pump indicate?

Accepted Answer

The pump is drawing water from a source below the impeller (suction lift)

Answer

Negative (below atmospheric) pressure on the suction side is normal when the pump is lifting water from a lower source.

(ABC) Association of Boards of Certification Practice Test