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Texas Class D Water License(Complete)Questions And Answers.
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Texas Class D Water License(Complete)Questions And Answers.
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Texas Class D WaterLicense(Complete)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? - Answer Aeration
TCEQ regulation states that Shore installations , marinas, boats and houses on the
watershed must have sewage? - Answer disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and manganese,
turning them into solid? - Answer particles
Well casing and cementing protect the well from collapse and surface ? - Answer
contamination
Sequestering does not remove iron from the water, but prevents it from combining
with oxygen and? - Answer reddening
The quantity of water a formation yields depends on the formations thickness and? -
Answer permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to aerate?
- Answer water
Aeration can be used to remove what from the water supply? - Answer iron and
manganese
Hydrogen sulfide has a rotten egg odor and is oxidized by? - Answer super-
chlorination
When Iron levels get this high, it can cause red stains on clothing, colored water, or
turbidity? - Answer 0.3 mg/L
Excess Manganese can cause? - Answer black stains
Another method of iron control is the use of? - Answer sequestering agents
What is a sequestering agent? - Answer polyphosphates
Well water is sometimes? - Answer corrosive
Low ph, dissolved gases, high temperatures, and high mineral levels can cause well
water to be? - Answer corrosive
What is the process of removing calcium and magnesium by adding lime or by
exchanging ions? - Answer softening
An ion exchange replaces calcium ions with? - Answer sodium ions
, Texas Class D Water
License(Complete)Questions And
Answers.
A process available for removing arsenic, fluoride, lead, mercury, nitrate, and silver
from raw water is? - Answer coagulation followed by sedimentation and filtration
A process that forces water through a membrane is? - 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? -
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? - Answer surface water
Changes in groundwater quality can indicate influence of surface water organisms
such as giardia cysts, algae or other? - 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? -
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? - Answer surface
water organisms
What are underground, water-bearing formations yielding useful quantities of water?
- Answer Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of
land)? - Answer overpumping
The purpose of the well screen is to keep out birds and? - Answer sand
the most important feature of the well screen is the size of the? - 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 ? - Answer development
The gravel pack is fine gravel placed around the screen to reduce pumping? -
Answer sand
The well vent is a vacuum breaker allowing the casing to breathe as water levels
change when the pump? - Answer cycles
All public wells must be provided with a steel sealing block, a meter, a screened
vent, and a sampling? - Answer faucet
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