Texas Class D Water License(Complete)Questions And Answers.
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Course
TCEQ
Institution
TCEQ
Texas Class D Water License(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?
Aeration
...
Texas Class D Water License(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?
Aeration
TCEQ regulation states that Shore installations , marinas, boats and houses on
the watershed must have sewage?
disposal
Water aerated or chlorinated at proper pH levels oxidizes the iron and
manganese, turning them into solid?
particles
Well casing and cementing protect the well from collapse and surface ?
contamination
Sequestering does not remove iron from the water, but prevents it from
combining with oxygen and?
reddening
The quantity of water a formation yields depends on the formations thickness
and?
permeability
Cascade aerators, packed air-stripping towers, and air diffusers are used to
aerate?
water
Aeration can be used to remove what from the water supply?
iron and manganese
Hydrogen sulfide has a rotten egg odor and is oxidized by?
super-chlorination
When Iron levels get this high, it can cause red stains on clothing, colored water,
or turbidity?
0.3 mg/L
Excess Manganese can cause?
black stains
Another method of iron control is the use of?
sequestering agents
What is a sequestering agent?
polyphosphates
Well water is sometimes?
corrosive
Low ph, dissolved gases, high temperatures, and high mineral levels can cause
well water to be?
corrosive
What is the process of removing calcium and magnesium by adding lime or by
exchanging ions?
softening
, An ion exchange replaces calcium ions with?
sodium ions
A process available for removing arsenic, fluoride, lead, mercury, nitrate, and
silver from raw water is?
coagulation followed by sedimentation and filtration
A process that forces water through a membrane is?
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?
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?
surface water
Changes in groundwater quality can indicate influence of surface water
organisms such as giardia cysts, algae or other?
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?
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?
surface water organisms
What are underground, water-bearing formations yielding useful quantities of
water?
Aquifiers
Problems caused by what are declining water levels and subsidence (sinking of
land)?
overpumping
The purpose of the well screen is to keep out birds and?
sand
the most important feature of the well screen is the size of the?
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 ?
development
The gravel pack is fine gravel placed around the screen to reduce pumping?
sand
The well vent is a vacuum breaker allowing the casing to breathe as water levels
change when the pump?
cycles
All public wells must be provided with a steel sealing block, a meter, a screened
vent, and a sampling?
faucet
No source of contamination is allowed within how many feet of a public well?
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