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Field Test and Inspection Procedures Flashcards

7 cards from real ABC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Field Test and Inspection Procedures flashcards as text

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

    Answer: An uncovered finished water reservoir

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

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

    Answer: Recalibrate the meter using fresh buffer solutions

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

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

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

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

  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?

    Answer: 67%

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

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

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

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

  6. Under 40 CFR Part 141, what is the minimum free chlorine residual required in a public water system distribution system?

    Answer: 0.1 mg/L detectable

    The Total Coliform Rule requires a detectable (measurable) disinfectant residual throughout the distribution system; EPA guidance cites 0.2 mg/L but 0.1 mg/L is the detectable threshold.

  7. What is the purpose of a jar test performed during a water treatment plant inspection?

    Answer: Simulating coagulation and flocculation to optimize chemical dosing

    The jar test replicates the coagulation–flocculation–settling process at bench scale to find the optimal coagulant dose and pH.