Introduction to Groundwater Monitoring
questions with verified answers
Approximately how thick should the primary seal be Ans✓✓✓ 30cm
At what range and change in elevation can a barometric pressure
transducer accurately compensate for water level logger Ans✓✓✓
30km radius and every 300m change in elevation
Auger drilling rigs are well suited for drilling in what conditions
Ans✓✓✓ Fine to medium grained unconsolidated material, or poorly
consolidated bedrock
Boreholes must be at least ___ larger than the OD of the casing and
screen Ans✓✓✓ 10cm
Casing must be cut off at least ___ below ground level Ans✓✓✓ 0.5m
Define aquifer Ans✓✓✓ saturated geologic unit that can store transmit
and yield groundwater in sufficient quantity to constitute a usable
supply
Describe an anisotropic geological formation Ans✓✓✓ when the
horizontal and vertical hydraulic conductivity are unequal to each other
,Describe an isotropic geological formation Ans✓✓✓ when the
horizontal and vertical hydraulic conductivity are equal to each other
Describe glaciofluvial Ans✓✓✓ deposited by glacial melt water
channels
Describe glaciolacustrine Ans✓✓✓ fine-grained sediments deposited in
glacial lakes
Downgradient well are placed in location that allows interception of
water ____ the site Ans✓✓✓ exiting
Flow direction maps are ____ specific Ans✓✓✓ aquifer
Groundwater levels can fluctuate due to what three factors Ans✓✓✓
Changes in storage, leakage, and loading
Horizontal hydraulic conductivity is determined by conducting what test
Ans✓✓✓ slug test
How many piezometers are required in order to determine flow
direction and hydraulic gradient Ans✓✓✓ 3
, If the properties of the geologic formation are invariable in space, the
formation is considered to be what Ans✓✓✓ homogeneous
In order to ensure accurate water level contours all wells must be
drawing from the same what? Ans✓✓✓ aquifer
In what situations are hollow-stem augers used in Ans✓✓✓ unstable
borehole conditions
In what situations would be steel be inappropriate to use as a casing
material Ans✓✓✓ to measure concentrations of metal
In what type of aquifers do changes in barometric pressure change the
water level the most Ans✓✓✓ Confined aquifers
Monitoring piezometers are most commonly constructed of what
Ans✓✓✓ threaded PVC pipe
Most monitoring piezometers are constructed of what Ans✓✓✓ 2.5"
PVC pipe
Name four different instruments for measuring groundwater depth
levels Ans✓✓✓ steel tape, e-tape, pressure transducer, and float
recorder
questions with verified answers
Approximately how thick should the primary seal be Ans✓✓✓ 30cm
At what range and change in elevation can a barometric pressure
transducer accurately compensate for water level logger Ans✓✓✓
30km radius and every 300m change in elevation
Auger drilling rigs are well suited for drilling in what conditions
Ans✓✓✓ Fine to medium grained unconsolidated material, or poorly
consolidated bedrock
Boreholes must be at least ___ larger than the OD of the casing and
screen Ans✓✓✓ 10cm
Casing must be cut off at least ___ below ground level Ans✓✓✓ 0.5m
Define aquifer Ans✓✓✓ saturated geologic unit that can store transmit
and yield groundwater in sufficient quantity to constitute a usable
supply
Describe an anisotropic geological formation Ans✓✓✓ when the
horizontal and vertical hydraulic conductivity are unequal to each other
,Describe an isotropic geological formation Ans✓✓✓ when the
horizontal and vertical hydraulic conductivity are equal to each other
Describe glaciofluvial Ans✓✓✓ deposited by glacial melt water
channels
Describe glaciolacustrine Ans✓✓✓ fine-grained sediments deposited in
glacial lakes
Downgradient well are placed in location that allows interception of
water ____ the site Ans✓✓✓ exiting
Flow direction maps are ____ specific Ans✓✓✓ aquifer
Groundwater levels can fluctuate due to what three factors Ans✓✓✓
Changes in storage, leakage, and loading
Horizontal hydraulic conductivity is determined by conducting what test
Ans✓✓✓ slug test
How many piezometers are required in order to determine flow
direction and hydraulic gradient Ans✓✓✓ 3
, If the properties of the geologic formation are invariable in space, the
formation is considered to be what Ans✓✓✓ homogeneous
In order to ensure accurate water level contours all wells must be
drawing from the same what? Ans✓✓✓ aquifer
In what situations are hollow-stem augers used in Ans✓✓✓ unstable
borehole conditions
In what situations would be steel be inappropriate to use as a casing
material Ans✓✓✓ to measure concentrations of metal
In what type of aquifers do changes in barometric pressure change the
water level the most Ans✓✓✓ Confined aquifers
Monitoring piezometers are most commonly constructed of what
Ans✓✓✓ threaded PVC pipe
Most monitoring piezometers are constructed of what Ans✓✓✓ 2.5"
PVC pipe
Name four different instruments for measuring groundwater depth
levels Ans✓✓✓ steel tape, e-tape, pressure transducer, and float
recorder
