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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 performing a coliform sample from a new water main before placing it into service, how many consecutive satisfactory samples are typically required by US regulations?

    Answer: 2

    The Total Coliform Rule generally requires two consecutive satisfactory bacteriological samples before a new main is approved for service.

  2. Which test is performed in the field to quickly estimate the biological oxygen demand (BOD) trend without laboratory incubation?

    Answer: COD rapid test

    Chemical Oxygen Demand (COD) is a rapid surrogate that correlates to BOD and can be completed with field test kits.

  3. An operator notices the turbidity of filtered water has increased from 0.1 NTU to 0.45 NTU. Under the Surface Water Treatment Rule, the regulatory action level is:

    Answer: 0.3 NTU in 95% of samples per month

    SWTR requires filtered water turbidity to be ≤0.3 NTU in 95% of monthly measurements for conventional filtration.

  4. What is the purpose of performing a chlorine demand test on a water sample?

    Answer: To determine how much chlorine is consumed before a residual remains

    Chlorine demand is the difference between the chlorine dose applied and the residual remaining after contact time.

  5. A wastewater inspector observes foam formation in an activated sludge aeration basin. The MOST likely cause is:

    Answer: Excessive filamentous organism or surfactant presence

    Persistent foam in aeration basins is commonly caused by filamentous bacteria (e.g., Nocardia) or surfactants in the influent.

  6. Which container material is required when collecting samples for volatile organic compound (VOC) analysis?

    Answer: 40 mL glass vial with Teflon-lined septum cap, no headspace

    VOC samples must be collected in 40 mL vials with no headspace to prevent volatilization losses during transport.

  7. What field inspection step verifies the integrity of a water storage tank's roof vent?

    Answer: Inspecting the screened vent for blockage and intact mesh

    Roof vents must be screened to prevent insects, birds, and debris from entering the tank; blocked vents create pressure problems.