Texas Class D Water Test Updated Questions and Answers (2024 / 2025) (Verified Answers)

Texas Class D Water Test Updated Questions and Answers (2024 / 2025) (Verified Answers).1. Who is authorized to remove a lock and tag placed on a piece of equipment to isolate it for maintenance? ANS Only the person who placed the lock and tag 2. In addition of an emergency residual pressure of 20 psi, what is the mini- mum normal operating pressure a public water supply system should main- tain? ANS 35 psi 3. What is the minimum distance separating installed water mains from any sewer lines or other possible contaminated lines? ANS 9 feet 4. What is the minimum distance required to separate grazing livestock and septic tanks from a public well? ANS 50 feet 5. What color does the sample turn when the DPD reagent is added to water containing chlorine? ANS Red 6. A system is operating at a flow rate of 2.2 MGD. A chlorine dose of 10 mg/L is required to maintain a disinfectant residual of 0.4 mg/L. Calculate the daily chlorine demand in pounds. ANS 176 pounds 7. A tank with 1 foot of water above a pressure gauge at the bottom will register a reading of ANS 0.433 psi 8. Pipe and fittings used in public water systems may not contain more than % lead or solder and flux may not contain more than % lead. ANS 0.25%, 0.2%