2650 East 40 th Avenue • Denver, Colorado 80205 • www.geotechenv.com 2650 East 40 th Avenue • Denver, Colorado 80205 • www.geotechenv.com GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS CHARACTERIZING GROUND-WATER FLOW VELOCITY AND PREFERENTIAL FLOW ZONES The Nielsen Environmental Field School, Inc. 2012 North American Environmental Field Conference & Exposition (East)
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Characterizing Groundwater Flow Velocity And Preferential Flow Zones
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2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com
GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
CHARACTERIZING GROUND-WATER
FLOW VELOCITY AND PREFERENTIAL
FLOW ZONES
The Nielsen Environmental Field School, Inc.
2012 North American Environmental Field Conference & Exposition (East)
2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com
GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Agenda
• Introductions
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com
GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Audience Introductions
• Name
• Company name
• Experience with site characterization
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Why Characterize Groundwater Flow
• Plan efficient remediation
– Quantify extent and magnitude of underlying
contaminants
– Define exposure routes
– Define flow velocity
– Identify and assess risks
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Criteria for Characterizing
Groundwater Flow• Site geology
– Distribution of geologic materials
– Stratigraphic and structural relationships
– Features that affect the subsurface migration of contaminants
• Rate and direction of ground water flow– All impacted aquifers
• Groundwater– Contaminants present
– Concentrations of contaminants
– Vertical and lateral extent of contaminants
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Methods of Groundwater Flow
Characterization
• Groundwater level measurements
• Potentiometric maps
• Well clusters screened at different depths
• Seasonal and temporal factors
• Hydraulic conductivity
• Tracer tests
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
How Does the Borescope Work?
• Directly observes groundwater flow velocity
• Measures flow at selected depths within a well and thus the ability to measure flow from individual fractures
• Allows capture of an aerial and vertical distribution of groundwater flow velocities that is useful for the interpretation of contaminant migration in complex flow systems
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Why is a Borescope Better?
• Hydraulic conductivity values calculated from most aquifer tests in fractured rocks are meaningless
• Groundwater flow directions in fracture porous media can be diagonal to the hydraulic gradient
• Groundwater flow and contaminant transport in fractured porous aquifers is complicated by flow in porous blocks
• Flow in sandstone or siltstone blocks may be in the direction of the hydraulic gradient while groundwater in the fractures will migrate in a direction parallel to the fractures
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Conceptual Diagram
Source: Oak Ridge National Laboratory, “Characterization of a Fractured Aquifer Using the Colloidal Borescope”
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
AquaLITE 7.2x
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
AquaLITE 7.2xSoftware Outputs
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Video digitizer
Computer
92 cm
9 cm
MSC047
GroundwaterFlow
SandPack
High-ResolutionMonitor
Manometer
EffluentWater Level
InfluentWater Level
Reservoir/SandMembrane Screen
5-cm FullyPenetrating Well
10-cm FullyPenetrating Well
Electronic cable
Borescope
PackSand
132 cm
153 cm
Colloidal
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
EXPERIMENT #4
EXPERIMENT #3
EXPERIMENT #2
Sand #5
Sand #3
Sand #4
Groundwater Flow
Layered Flow
Sand #3
Groundwater Flow
Fully vs Partially Penetrating Well
Sand #3
Groundwater Flow
Sand Pack Influence
Sand #2
Well Diameter ComparisonEXPERIMENT #1
Groundwater Flow
Sand #1
5-cm FullyPenetrating Well
FullyPenetrating Well
No Sand Pack
Penetrating Well5-cm Fully
Screen
Screen
Coarse-GrainSand Pack
Penetrating WellPartially
Screen
Coarse-GrainSand Pack
Screen
10-cm FullyPenetrating Well
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Laboratory tracer test results using sodium chloridewith an average linear porewater velocity in thesand equal to 0.10 m/d. (Sudicky et al., 1985)
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
110
50
Dep
th (c
m)
Dep
th (
cm)
60
70
80
90
100
120
110
120
100
90
80
70
60
50
0.01 0.1
Degree from expectedflow direction
Velocity in well (cm/s)
110
Degree from expected
60120
80100
flow direction
4020
4020 60
80100
Dep
th (
cm)
100
90
80
70
60
50
110
Velocity in well (cm/s)
120
Dep
th (
cm)
100
90
80
70
60
50
1.0
0.10.01 1.0
Fine (#4)
Medium (#3)
Coarse (#5)
Fine (#4)
Coarse (#5)
Medium (#3)
Fine (#4)
Medium (#3)
Coarse (#5)
Fine (#4)
Medium (#3)
Coarse (#5)
a) b)
c) d)
6010080 4040
20 20 6080
100
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Well Bore Well Borer
r ii
Well BoreWell Bore
Finite Skin orDevelopment Zone
Filter Pack
Filter PackFilter Pack
r
r
r
123 K
a b
c d
MSC102
r
r
r
1
2
3
1 2 3
1
2
3
K K
Groundwater Flow
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
0 20 40 60 80 100 120 140
0
0.5
1.0
0
0.5
1.0
0
1.0
0.5
0
1.0
0.5
0
1.0
0.5
MSC028
Point #5
Point #4
Point #3
Point #2
Point #1
Time (hr)
Rel
ativ
e B
rC
once
ntr
atio
n (m
easu
red
/inje
cted
)
Screen
#1
#2
#3
#4
#5
Well
6
5
4
3
2
1
0
Dis
tanc
e F
rom
Bo
ttom
Of
Wel
l (m
)
Development of fresh water zone within thescreened interval of sampling well
(Bromide tests) After Robin and Gillham (1987)
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
0
0
FEET
400200
METERS
50 100
600
150
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Courtesy: ORNL
2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com2650 East 40th Avenue • Denver, Colorado 80205 • www.geotechenv.com
GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Courtesy: ORNL
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Preferential Flow
• Preferential flow
• Preferential flow
• Preferential flow
• Preferential flow
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
843
875
883818
H O L L O W
R O A D
W-20
C
W-18
880
891B873
891A
877
871
870
876
B
R O
U T
E
3
A
811
882
R O U T E1
R O
U T
E
2
B
879
A
M70
W- 7
841
840
C O
R R
A L
H O
L L
O W
R O
A D
879
W-25N-18
W-25N-11
W-25N-13
W7B
W873-06W872-02
MSC116
Colloidal Borescope Well
Building
RoadStream
0 150120906030METERS
FEET400300 5002001000
N
Direction and Magnitude
N
N N
N
NN
of Groundwater Flow
25% 50%
BORESCOPE TEST SITE
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
90
120
150
180
210
240
270
300
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
X
X
X
X
X
X
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
X X X X X X X X X X X X X X X X X X X
X
XX
X
X X X
XX
XXX
X X
X
XX
X
X
X
X X
X XX
X
XXX
X
X
X
X
X X
X
X
X
X
0 15 01209 06 03 0METERS
FEET4 0 0300 5002001000
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
X
X
X
X
X
X
X
X
X
X
X
0 1501209 06 030METERS
FEET400300 5002001000
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Tidal Influence on Groundwater Flow
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS
Groundwater
Flow in a Perched
Aquifer
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GROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTSGROUND WATER SAMPLING • WATER LEVEL & PRESSURE • WATER SAMPLE FILTRATION • GROUND WATER REMEDIATION • GEOPHYSICAL MEASUREMENTS