Safety and Regulations Flashcards
7 cards from real WTO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Safety and Regulations flashcards as text
What is the minimum acceptable dissolved oxygen level in a well-ventilated confined space before a water treatment worker may enter without supplied-air respiratory protection?
Answer: 19.5%
OSHA defines an oxygen-deficient atmosphere as one with less than 19.5% oxygen by volume; spaces must meet or exceed this level before entry without supplied-air protection.
Under the Lead and Copper Rule, if more than 10% of first-draw samples exceed the lead action level, what must the water system do?
Answer: Take corrosion control treatment steps and notify affected customers
When lead samples exceed the action level (15 µg/L) in more than 10% of homes sampled, the system must optimize corrosion control, enhance monitoring, and notify customers within required timeframes.
A water plant operator is washing down a chemical feed area and notices an unusual odor. What is the safest immediate response?
Answer: Stop work, leave the area, and report the observation to a supervisor
An unusual chemical odor may indicate a hazardous release; the safest response is to immediately vacate the area and notify a supervisor so a proper hazard assessment can be conducted.
Which document establishes the legal framework requiring states to set and enforce drinking water standards equivalent to or stricter than federal standards?
Answer: Safe Drinking Water Act (SDWA)
The SDWA, enacted in 1974 and amended multiple times, authorizes the EPA to set national drinking water standards and requires states to obtain primacy to enforce regulations at least as stringent as the federal standards.
What is the key difference between a Treatment Technique (TT) and a Maximum Contaminant Level (MCL) in drinking water regulations?
Answer: A TT requires a specific process be used rather than specifying a numeric contaminant limit
A Treatment Technique is an enforceable procedure or level of technological performance used when measuring a contaminant is not economically or technically feasible, whereas an MCL is a numeric concentration limit.
What must a water treatment operator do FIRST upon discovering that a chemical storage tank is leaking and the spill is reaching a floor drain?
Answer: Block the floor drain to prevent the chemical from entering the sewer system
Blocking the floor drain prevents the chemical from entering the sewer system or waterways, which could cause environmental harm and regulatory violations; containment is the first priority.
Which EPA program requires water systems to assess their vulnerability to physical, chemical, and cyber threats and submit certification to the EPA?
Answer: America's Water Infrastructure Act (AWIA) Risk and Resilience Assessments
The America's Water Infrastructure Act of 2018 requires community water systems serving more than 3,300 people to conduct Risk and Resilience Assessments and certify completion to the EPA on a six-year cycle.