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Assessment and Remediation of ChlorideImpacted Groundwater: A Case Study
Gordon MacMillan, Matrix Solutions Inc.
Robert Pockar, Matrix Solutions Inc.
Brent Bowerman, Canadian Natural Resources Ltd.
B
B
88-3
88-8
88-1
86-5-1 86-5-286-6-2
00-1800-19
86-6-1
P97-1A
00-17
88-9
88-2B88-2A
88-7
FORMERAMINE POND
FORMEREVAPORATION
PONDFORMER
BURNPIT
SCALE
0 50 m
WETLAND
ACC ESS
ROAD
LEGEND
GROUNDWATER CONTOUR
GROUNDWATER ELEVATION
MONITORING WELL LOCATION
GROUNDWATER FLOW MAP
BUSH
BUSH
BUSHBUSH
BUSH
88-3
88-8
88-1
86-5-1 86-5-286-6-2
00-18
00-19
86-6-1
P97-1A00-17
88-9
88-2B88-2A
100
0
3000
1 0000
3000
0
88-7
FORMERAMINE POND
FORMEREVAPORATION
PONDFORMER
BURNPIT
SCALE
0 50 m
WETLAND
ACCESS ROAD
ACC ESS
ROAD
LEGEND
MONITORING WELL LOCATION
CHLORIDE CONCENTRATION (mg/L)
A'
A
4,140
6,120
34,100
19,400
1,110
64.4
9,650
11,500
722
6,590
1,760
12,400
30,300
486
5,210
4,140
AREAL CHLORIDE DISTRIBUTION
B
88-7
B
88-3
88-8
88-1
86-5-1 86-5-286-6-2
00-1800-19
WETLAND
86-6-1
P97-1A
00-17
88-9
88-2B88-2A
SCALE
0 50 m
FORMERAMINE POND
FORMEREVAPORATION
PONDFORMER
BURNPIT
LEGEND
MONITORING WELL LOCATION
APPARENT CONDUCTIVITY (mS/m)
50 80 110 140 170 200
ACCESS
ROAD
VERTICAL CONDUCTIVITY
VC23VC24
VC25 VC26
VC22
VC21
VC20
VC1VC2 VC3
VC4
VC5
VC6VC7
VC8
VC19 VC18 VC17 VC16 VC15 VC14 VC13 VC12 VC11VC10
VC9
EM31 APPARENT CONDUCTIVITY DATA VERTICAL DIPOLE
200
200400
400600
600
800
800
1000
600
200
200
200
4,120
30,300
12,400
6,590
97-7A
86-5-2
FORMER PIT AND POND AREA
88-2B
88-897-1A
00-18WETLAND
SOUTHA
NORTHA'
SILTY CLAY FILL
TOPSOIL
SAND
SAND
CLAY TILL
SI LTY SA ND
SAND / SANDY SILT?
?
?
98
97
96
95
94
93
92
91
90
89
88
DEP
TH (m
)
HORIZONTAL SCALE
0 100 m
6,590
WATER LEVEL ELEVATION
SCREEN INTERVAL
TOTAL DEPTH DRILLED
CONDUCTIVITY CONTOUR
CHLORIDE CONCENTRATION (mg/L)
1000
34,400
VC25
VC4
VC14
VERTICAL CHLORIDE DISTRIBUTION MAP
Remediation Objective
Protect wetland from further impact by:
1) Capturing chloride impacted groundwater andprevent elevated chloride from discharging to the wetland.
2) Removing dissolved chloride from the subsurface
BUSH
BUSH
BUSHBUSH
BUSH
88-3
88-8
88-1
86-5-1 86-5-286-6-2
00-18
00-19
86-6-1
P97-1A00-17
88-9
88-2B88-2A
100
0
3000
1 0000
3000
0
88-7
FORMERAMINE POND
FORMEREVAPORATION
PONDFORMER
BURNPIT
SCALE
0 50 m
WETLAND
ACCESS ROAD
ACC ESS
ROAD
LEGEND
MONITORING WELL LOCATION
CHLORIDE CONCENTRATION (mg/L)
4,140
6,120
34,100
19,400
1,110
64.4
9,650
11,500
722
6,590
1,760
12,400
30,300
486
5,210
4,140
GROUNDWATER REMEDIATION SYSTEM
B
B
88-3
88-8
88-1
86-5-1 86-5-286-6-2
00-1800-19
86-6-1
P97-1A
00-17
88-9
88-2B88-2A
92
93
94
95
88-7
FORMERAMINE POND
FORMEREVAPORATION
PONDFORMER
BURNPIT
SCALE
0 50 m
WETLAND
ACC ESS
ROAD
LEGEND
MONITORING WELL LOCATION
SIMULATED HYDRAULICHEAD CONTOUR (m)
CAPTURE ZONE
CAPTURE ZONE
PREDICTED HYDRAULIC HEAD DISTRIBUTION AFTER SIX MONTHS
0 4 8 12 16 20 240
2
4
6
8
10
12
Duration of Pumping (Months)
it
(
GROUNDWATER INTERCEPTION TRENCHPredicted Groundwater Production Rate
PREDICTED GROUNDWATER RECOVERY RATE
Pre
dict
ed G
roun
dwat
er R
ecov
ery
Rat
e (m
3 /da
y)
NTS V
ALV
E TRE
E
RW2 V
ALV
E TRE
E
RW4 V
ALV
E TRE
E
RW1 V
ALV
E TRE
E
V-170
M
RW1 RW2 RW4RW3
RW3 V
ALV
E TRE
E
P-150
VALVE TREE SCHEMATIC
R-160
LEGEND
V-140
F-130
P-1
00
P-1
00
P-1
00
P-1
00
P-1
00
2"-PVC-80°
1"- P
VC- 8
0°
1"- P
VC- 8
0°
1"- P
V C- 8
0°
1"- P
VC- 8
0°
1"- P
VC- 8
0°
1"- P
E-160
PSI
1"- P
E-160
PSI
1"- P
E-160
PSI
1"- P
E-160
PSI
1"- P
E-160
PSI
2"-PE-100 PSI
2" - CAR
BON ST
EEL
1/2" -SS
1 /2" - S
S
1/2" -SS
1"- P
VC- 8
0°
LOCATED WITHING THEMETERING BUILDING
M M M M
M
PI
PI
PI
CR
FQI
PI
PI
INSULATED AND HEAT TRACED
BALL VALVE
CHECK VALVE
BUTTERFLY VALVE
PRESSURE INDICATOR
UNION
INSTRUMENT ELECTRICAL LINE
HIGH HIGH LEVEL SWITCH
GATE VALVE
REDUCER
TEE
1/2"-NPT THREAD
NEEDLE VALVE
THREE WAY VALVE
FILTER
5
5
GROUNDWATER RECOVERY SYSTEM PROCESS AND INSTRUMENTATION DESIGN
Remediation System Performance
Cumulative Chloride Recovery
0
500
1,000
1,500
2,000
2,500
20-Jul3-A
ug17-A
ug31-A
ug
Date
Rec
over
ed C
l Mas
s (K
g)� System has been in operation
since July 2002.
� Initial groundwater recoveryrate of approximately 5m3/day.
� Recovered groundwater hasan average concentration of9,000 mg/L.
� Average chloride recoveryrate of 50 Kg/day.
� Future work includesestablishing site specificremediation criteria.
Assessment and Remediation Review
� Clearly identify the purpose of the project:� Fresh groundwater
� Aspen stand
� Detailed assessment proved invaluable throughout eachstage of the project:
� Explore possibility of natural attenuation
� Trench and well depth and locations
� Recovery rates
� Simple numerical simulation is a valuable tool for:� Evaluation of the remediation system
� Estimate of capture zones
� Estimation of recovery rates for pump and line sizing
Recommended