Texas Class D: Water License
CORRECT AND VERIFIED Q AND A
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
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
CORRECT AND VERIFIED Q AND A
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
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
