Chapter 6 Flashcards
Water in an aquifer is called _______water
Ground
A well drilled into a water table aquifer is usually a _________well
Shallow
Aquifers sandwiched between impermeable layers of rock or clay are called confined aquifers or artesian wells ( true or false )
True
Wells dug into artesian aquifers are considered _________wells
Deep
Porosity is the percentage of openings or pores within a formation ( true or false)
True
Permeability is the ability to ________water through the aquifer
Transmit
Some artesian aquifer recharge areas ( outcrop) are located many miles away from the well development site ( true or false)
True
No public well can be within ______feet of a livestock , sewer lines, septic tanks, storm sewers, or cemeteries
50 feet
No public well can be within. __________feet of a septic tank drain field , improperly constructed water well , or underground fuel or chemical tank
150 feet
A sanitary control easement covering land within _______feet of a public well must be recorded in county courthouse records
150 feet
Abandoned wells, not plugged, within ______mile of proposed well site must be reported to TCEQ
1/4 mile
Well casing supports the bore hole and helps protect the aquifer from contamination. ( true or false )
True
The casing must extend at least _____inches above the floor of the pump room or ground surface
18 inches
The well screen prevents _______ from entering the well.
Sand
The well casing ________acts as a vacuum breaker
Vent
TCEQ REQUIRES A faucet for raw water sampling on the discharge pipe of each PWS WELL ( true or false )
True
TCEQ requires a _______on the discharge side of each well to measure yields for water production data.
Meter
Two types of well pumps in common use are the line shaft vertical turbine and the _________
Submersible
The line shaft turbine is driven by a motor located above the pump at ground level ( true or false)
True
The submersible pump is driven by a _________motor locate under the pump
Waterproof
The water level in the well casing when the pump is off is called the static level ( true or false)
True
The water level in the well casing when the pump is on is called the _______
Pumping level
The difference between the static level and pumping level is called the _____
Drawdown
Three ways to measure water levels is the wetted tape, electric sounder, and the ________
Air line
A bacteriological sample, taken from a newly constructed well, on ________successive days, must show negative results
3
The state requires a physical and chemical analysis of the new well water after ______ hours of pumping
36
The state requires wells be protected by ________fences or locked well houses
Intruder resistant
Groundwater has more minerals and dissolved solids than surface water ( true or false)
True
Ground water is usually clear and void of ______
Bacteria
Treatment for excessive mineral content includes softening, ion exchange, EDR, and _______
Reverse osmosis
Hydrogen sulfide gas can be removed by an ________process
Aeration
A type of poly phosphate can be used to _________clear water iron ( dissolved iron ) before it is oxidized and becomes red ,suspended iron
Sequester
Treatment of corrosive ground water can be accomplished by adding alkalinity as lime or soda ash to adjust the PH ( true or false )
True
