Texas Class D Water License Questions and Answers What removes tastes, odors, and certain organics and gases, and oxidizes iron and manganese? This process includes the incorporation of air into the water by means of spray nozzles , steps or cascades, or trays of diffusers? - Correct Answer Aeration TCEQ regulation states that Shore installations , marinas, boats and houses on the watershed must have sewage? - Correct Answer disposal Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese, turning them into solid? - Correct Answer particles Well casing and cementing protect the well from collapse and surface ? - Correct Answer contamination Sequestering does not remove iron from the water, but prevents it from combining with oxygen and? - Correct Answer reddening The quantity of water a formation yields depends on the formations thickness and? - Correct Answer permeability Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate? - Correct Answer water Aeration can be used to remove what from the water supply? - Correct Answer iron and manganese Hydrogen sulfide has a rotten egg odor and is oxidized by? - Correct Answer super- chlorination When Iron levels get this high, it can cause red stains on clothing, colored water, or turbidity? - Correct Answer 0.3 mg/L Excess Manganese can cause? - Correct Answer black stains Another method of iron control is the use of? - Correct Answer sequestering agents What is a sequestering agent? - Correct Answer polyphosphates Well water is sometimes? - Correct Answer corrosive Low ph, dissolved gases, high temperatures, and high mineral levels can cause well water to be? - Correct Answer corrosive 1 / 2
What is the process of removing calcium and magnesium by adding lime or by exchanging ions? - Correct Answer softening An ion exchange replaces calcium ions with? - Correct Answer sodium ions A process available for removing arsenic, fluoride, lead, mercury, nitrate, and silver from raw water is? - Correct Answer coagulation followed by sedimentation and filtration A process that forces water through a membrane is? - Correct Answer reverse osmosis In reverse osmosis a sheet of synthetic material (membrane) under pressure prevents passage of dissolved materials and larger particles and ejects them in a? - Correct Answer waste stream The Surface Water Treatment Rule (SWTR) requires community and non-community wells, springs, and infiltration galleries ( a subsurface tunnel that collects groundwater) to determine possible direct influence of? - Correct Answer surface water Changes in groundwater quality can indicate influence of surface water organisms such as giardia cysts, algae or other? - Correct Answer microorganisms If well is deeper than 50 feet and more than 200 feet from a nearby surface water body, extensive evaluation of the influence of surface water on a water supply is? - Correct Answer not required Surface water evaluations are needed on a water supply when shifts in water quality occur such as turbidity, temperature, pH, and the presence of? - Correct Answer surface water organisms What are underground, water-bearing formations yielding useful quantities of water? - Correct Answer Aquifiers Problems caused by what are declining water levels and subsidence (sinking of land)? - Correct Answer overpumping The purpose of the well screen is to keep out birds and? - Correct Answer sand the most important feature of the well screen is the size of the? - Correct Answer opening The mesh size of the screen is determined by the size of the aquifer material, the size of the gravel in the gravel pack, and the type of well ? - Correct Answer development The gravel pack is fine gravel placed around the screen to reduce pumping? - Correct Answer sand
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