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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 inspecting a drinking water well, which condition is the MOST critical indicator of potential surface-water contamination of the aquifer?

    Answer: Annular seal grouting that extends less than 18 feet below land surface

    An inadequate annular seal allows surface water, including pathogens, to migrate directly into the well casing along the borehole.

  2. A flow meter at a wastewater plant effluent reads 2.8 MGD but the plant's rated permitted flow is 2.5 MGD. The inspector should FIRST:

    Answer: Document the exceedance, notify the permitting authority, and initiate bypass protocols per the permit

    Permit exceedances must be documented and reported to the regulatory authority; operators cannot alter meter readings to mask violations.

  3. What does the term 'CT value' represent in disinfection calculations?

    Answer: Disinfectant concentration (mg/L) multiplied by contact time (minutes)

    CT = concentration (C) × time (T) and is used to demonstrate adequate inactivation credit for pathogens under the SWTR.

  4. During a wastewater treatment plant inspection, the secondary clarifier shows a rising sludge blanket reaching the effluent weir. The MOST likely cause is:

    Answer: Denitrification causing buoyant sludge or sludge bulking from low dissolved oxygen

    Rising sludge in clarifiers is typically caused by denitrification gas lift or filamentous bulking from low DO in the aeration basin.

  5. An inspector must verify the accuracy of a magnetic flow meter in a water main. The most practical field verification method is:

    Answer: Replacing the meter with a temporary ultrasonic clamp-on meter and comparing readings

    A calibrated ultrasonic clamp-on meter installed adjacent to the magnetic meter provides a non-intrusive comparison without service interruption.

  6. What is the primary reason for collecting a field blank sample during a water quality sampling event?

    Answer: To detect contamination introduced by the sampling equipment or process itself

    A field blank (reagent-grade water processed through the sampling equipment) identifies contamination from bottles, tubing, or field handling.

  7. Under the Lead and Copper Rule, first-draw lead samples must be collected after water has stood motionless in the plumbing for at least:

    Answer: 6 hours

    The Lead and Copper Rule requires a minimum 6-hour standing time before first-draw sampling to capture lead leaching from service lines and plumbing.