Introduction to Groundwater Monitoring
Auger drilling rigs are well suited for drilling in what conditions - ANSWER-Fine to
medium grained unconsolidated material, or poorly consolidated bedrock
Boreholes must be at least ___ larger than the OD of the casing and screen -
ANSWER-10cm
Casing must be cut off at least ___ below ground level - ANSWER-0.5m
Define aquifer - ANSWER-saturated geologic unit that can store transmit and yield
groundwater in sufficient quantity to constitute a usable supply
Describe an anisotropic geological formation - ANSWER-when the horizontal and
vertical hydraulic conductivity are unequal to each other
Describe an isotropic geological formation - ANSWER-when the horizontal and vertical
hydraulic conductivity are equal to each other
Describe glaciofluvial - ANSWER-deposited by glacial melt water channels
Describe glaciolacustrine - ANSWER-fine-grained sediments deposited in glacial lakes
Downgradient well are placed in location that allows interception of water ____ the site -
ANSWER-exiting
Flow direction maps are ____ specific - ANSWER-aquifer
Groundwater levels can fluctuate due to what three factors - ANSWER-Changes in
storage, leakage, and loading
Horizontal hydraulic conductivity is determined by conducting what test - ANSWER-slug
test
How many piezometers are required in order to determine flow direction and hydraulic
gradient - ANSWER-3
If the properties of the geologic formation are invariable in space, the formation is
considered to be what - ANSWER-homogeneous
In order to ensure accurate water level contours all wells must be drawing from the
same what? - ANSWER-aquifer
In what situations are hollow-stem augers used in - ANSWER-unstable borehole
conditions
, In what situations would be steel be inappropriate to use as a casing material -
ANSWER-to measure concentrations of metal
In what type of aquifers do changes in barometric pressure change the water level the
most - ANSWER-Confined aquifers
Monitoring piezometers are most commonly constructed of what - ANSWER-threaded
PVC pipe
Most monitoring piezometers are constructed of what - ANSWER-2.5" PVC pipe
Name four different instruments for measuring groundwater depth levels - ANSWER-
steel tape, e-tape, pressure transducer, and float recorder
Name three factors that influence hydraulic conductivity - ANSWER-soil grain
size,porosity of the soil matrix, soil saturation
Name three kinds of unconsolidated rock - ANSWER-colluvial, fluvial, lacustrine
Name three properties of the soil, soil logging describes - ANSWER-grain size, soil
texture, and lithology
Name three reasons why narrow diameter monitoring wells are most commonly used -
ANSWER-less expensive to install, volume of cuttings reduced, significantly less purge
volume
Name three unconsolidated surficial deposits - ANSWER-colluvial, fluvial,lacustrine
Name two objectives of GW level monitoring - ANSWER-assessing depth to water level,
detecting impact of GW recharge and discharge
Name two objectives of GW quality monitoring - ANSWER-tracking changes in GW
quality, identifying potential contaminant sources
Of the type of formations that contain water which one has the lowest permeability -
ANSWER-Aquiclude
Ph is dependent on what physical parameter - ANSWER-temperature
Porosity not considered effective includes what - ANSWER-unconnected pores, water
bound to clay particles
PVC screens must have what two things - ANSWER-threaded flash joints, O-rings
Auger drilling rigs are well suited for drilling in what conditions - ANSWER-Fine to
medium grained unconsolidated material, or poorly consolidated bedrock
Boreholes must be at least ___ larger than the OD of the casing and screen -
ANSWER-10cm
Casing must be cut off at least ___ below ground level - ANSWER-0.5m
Define aquifer - ANSWER-saturated geologic unit that can store transmit and yield
groundwater in sufficient quantity to constitute a usable supply
Describe an anisotropic geological formation - ANSWER-when the horizontal and
vertical hydraulic conductivity are unequal to each other
Describe an isotropic geological formation - ANSWER-when the horizontal and vertical
hydraulic conductivity are equal to each other
Describe glaciofluvial - ANSWER-deposited by glacial melt water channels
Describe glaciolacustrine - ANSWER-fine-grained sediments deposited in glacial lakes
Downgradient well are placed in location that allows interception of water ____ the site -
ANSWER-exiting
Flow direction maps are ____ specific - ANSWER-aquifer
Groundwater levels can fluctuate due to what three factors - ANSWER-Changes in
storage, leakage, and loading
Horizontal hydraulic conductivity is determined by conducting what test - ANSWER-slug
test
How many piezometers are required in order to determine flow direction and hydraulic
gradient - ANSWER-3
If the properties of the geologic formation are invariable in space, the formation is
considered to be what - ANSWER-homogeneous
In order to ensure accurate water level contours all wells must be drawing from the
same what? - ANSWER-aquifer
In what situations are hollow-stem augers used in - ANSWER-unstable borehole
conditions
, In what situations would be steel be inappropriate to use as a casing material -
ANSWER-to measure concentrations of metal
In what type of aquifers do changes in barometric pressure change the water level the
most - ANSWER-Confined aquifers
Monitoring piezometers are most commonly constructed of what - ANSWER-threaded
PVC pipe
Most monitoring piezometers are constructed of what - ANSWER-2.5" PVC pipe
Name four different instruments for measuring groundwater depth levels - ANSWER-
steel tape, e-tape, pressure transducer, and float recorder
Name three factors that influence hydraulic conductivity - ANSWER-soil grain
size,porosity of the soil matrix, soil saturation
Name three kinds of unconsolidated rock - ANSWER-colluvial, fluvial, lacustrine
Name three properties of the soil, soil logging describes - ANSWER-grain size, soil
texture, and lithology
Name three reasons why narrow diameter monitoring wells are most commonly used -
ANSWER-less expensive to install, volume of cuttings reduced, significantly less purge
volume
Name three unconsolidated surficial deposits - ANSWER-colluvial, fluvial,lacustrine
Name two objectives of GW level monitoring - ANSWER-assessing depth to water level,
detecting impact of GW recharge and discharge
Name two objectives of GW quality monitoring - ANSWER-tracking changes in GW
quality, identifying potential contaminant sources
Of the type of formations that contain water which one has the lowest permeability -
ANSWER-Aquiclude
Ph is dependent on what physical parameter - ANSWER-temperature
Porosity not considered effective includes what - ANSWER-unconnected pores, water
bound to clay particles
PVC screens must have what two things - ANSWER-threaded flash joints, O-rings
