Wastewater Collection GRADE 1 Questions with 100% Correct Answers

When should atmospheric monitoring in a confined space be performed? Correct Answer Continuously from pre-entry to exit Below what maximum percentage is an atmosphere considered oxygen deficient? Correct Answer 19.5% Which type of pipe is recommended when crossing another underground utility? Correct Answer Ductile Iron pipe Which chemical may be used to remove sulfides by precipitation? Correct Answer Ferric Chloride (FeCl3) What is a Hydro-brake? Correct Answer A vortex flow regulator What is the purpose of LAMPING a new collection system? Correct Answer Test for obstructions and straightness How can most failures of a lift station be prevented? Correct Answer Proper preventative maintenance What info does a station book provide? Correct Answer ID Numbers and maps of stations Which pieces of equipment would be expected in a DRY WELL? Correct Answer Electric controls, motors, pumps (NOT FLOATS) What piece of equipment is used to prevent the discharged wastewater from flowing back into the wet well when the pump shuts off? Correct Answer Swing check valve Which piece of equipment is used to aid he testing for insulation resistance in a submersible pump motor? Correct Answer Megger What are the major reasons for a motor failure? Correct Answer Overloading, voltage imbalance, short cycling What is OLFACTORY FATIGUE? Correct Answer Loss of smell What instrument do you use to measure the pressure head in a pipe, tank, or soil? Correct Answer Piezometer What items should be listed on a Service Line Location Card? Correct Answer Location of a tap. Pipe size. Type of pipe. Cleanout location. What are indicators of a blockage in a sewer system? Correct Answer Overflowing manholes. septic wastewater. Flooded basements and buildings.