REHS Study Guide 620 Questions With Complete Solutions.

What is the depth at which flies can emerge from a landfill? correct answer: 6 inches compacted and 5 inches noncompacted Why is the use of cooper sulfate crystals recommended for some septic tanks systems correct answer: It will destroy roots that the solutions comes in contact with What is the overall purpose of bar screens, comminutors, and grit chambers when it comes to wastewater treatment? correct answer: It removes larger solid What is the most plentiful form of available water? correct answer: Groundwater What are Waterborne Diseases? correct answer: Results from ingestion of water that is harboring a pathogen example: Typhoid fever. What are Water-washed Diseases? correct answer: Spread by fecal-oral route or person to person contact. Facilitated by lack of personal hygiene. What are Water-based Diseases? correct answer: Caused by infection arising through ingestion of pathogenic agent Example: guinea worm larvae, Termatode larvae. What are Water-related Diseases? correct answer: Facilitated by insects vector that breed in water: example filariastus abthropods that carry Dengue fever.