REHS/RS Waste Water and Potable Water Questions and Answers Graded A

REHS/RS Waste Water and Potable Water Questions and Answers Graded A What is the best way to fix a leaking septic tank? inject seam with an epoxy resin What are the four common causes of septic tank seepage field system failure? leaky fixtures, improper sizing, non-suitable soil, non-servicing After servicing a septic tank, what should be done with the tank or lid? replaced and secured for security purposes After a septic tank is cleaned, why shouldn't it be disinfected? Sludge on unclean walls has seeding effect and assists in renewing bacterial activity. Also, cleaning it is a safety hazard. What things will reduce EPA priority pollutants in water? lime coagulation, mixed media filtration, and activated carbon filtration Sludge can be disposed of in which ways? How can it not be disposed? composting, landfill, incineration. NO OCEAN DUMPING. What is the first thing to do when a new septic tank is installed? use as normal How deep and level should the absorption beds and trenches in a septic system drain field be? shallow (1-5 feet) and level When the water table is 6 inches, what formation should the absorption bed be? mounded How often should a septic tank be inspected? Biannually How often should septic tanks be pumped? Every 3-5 years, depending on use What is a possible consequence of a septic tank sitting in a high water table? Tilting or floating of the tank. How soon can a new septic system be used after installation? Immediately what is a bad way of taking groundwater samples? percolation test What type of filtration system should be implemented in a small community? slow sand filter What filters are best at removing amebic cysts? diatomaceous earth. What does a septic system not include? filtration What disease is a wastewater treatment plant employee at high risk of contracting? Hepatitis A How is the amount of coliforms in water detected? Total Coliform Count or colilert test What establishment produces the most Biochemical Oxygen Demand? restaurant, followed by school What percent of BOD is taken out from a trickling filter? 45% Using wastewater for irrigation and consumable plant products may present a health hazard to humans if the water contains what metal? cadmium What does/doesn't affect the reliability and interpretation of the soil percolation test? does: size of hole, soil condition, site evalution. doesn't: shape of test hole Which soils would be most suitable for subsurface absorption of wastewater? red, yellow, and brown. What soil is least suitable for subsurface absorption of wastewater? mottled brown What is the most effective method discovered for running a percolation test? To make tests in holes that have been filled with water overnight. If there is a disaster and there is no running water for flushing toilets, what is the best way to control raw sewage? pit or privy toilet with dug out