DERR-2024-007834

Kennecott South Facilities Kennecott South Facilities
Groundwater RemediationGroundwater Remediation
ANNUAL PROGRESS REPORT 2004ANNUAL PROGRESS REPORT 2004
Kelly Payne, Kennecott Utah CopperKelly Payne, Kennecott Utah Copper
October 12, 2005October 12, 2005
CERCLA HistoryCERCLA History
„„Site proposed for NPL listing in 1994Site proposed for NPL listing in 1994
„„MOU in 1995 between EPA, State of MOU in 1995 between EPA, State of
Utah, and KennecottUtah, and Kennecott
„„RI/FS completed 1998RI/FS completed 1998
„„ROD issued 2000ROD issued 2000
„„RDRA completed 2002RDRA completed 2002
„„Consent Decree anticipated in 2005Consent Decree anticipated in 2005
ROD Selected RemedyROD Selected Remedy
„„Maintain source controlsMaintain source controls
„„Contain the plume Contain the plume
„„Remediate the aquiferRemediate the aquifer
„„Treat extracted groundwater and Treat extracted groundwater and
dispose of treatment residualsdispose of treatment residuals
Remedial SystemRemedial System
„„East Side Collection SystemEast Side Collection System
„„Two acid wellsTwo acid wells
„„Three barrier wellsThree barrier wells
„„Reverse Osmosis Plant Reverse Osmosis Plant
„„Tailings line and impoundmentTailings line and impoundment
Annual Groundwater Annual Groundwater
ExtractionExtraction
0
1000
2000
3000
4000
5000
6000
7000
2001 2002 2003 2004
A
c
r
e
-
F
e
e
t

P
e
r

Y
e
a
r
Acid Plume
Zone A Sulfate Plume
„„Plume map showing changesPlume map showing changes
<Plot 1146><Plot 1146>
ECG1146 SO4 CONCENTRATION
15000
20000
25000
30000
35000
40000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
SO
4

(
M
G
/
L
)
<Plot 1128A><Plot 1128A>
ECG1128A SO4 CONCENTRATION
15000
20000
25000
30000
35000
40000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
SO
4

(
m
g
/
l
)
<Plots 1115A&B><Plots 1115A&B>
ECG1115A SO4 CONCENTRATION
25000
30000
35000
40000
45000
50000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
SO
4

(
M
G
/
L
)
Acid Plume AcidityAcid Plume Acidity
0
2500
5000
7500
10000
12500
15000
17500
20000
2001 2002 2003 2004 2005
Ac
i
d
i
t
y

(
m
g
/
L

a
s

C
a
C
O
3
)
Acid Well #1
Acid Well #2
46%
36%
<Plots 1115A&B><Plots 1115A&B>
BSG1137A SO4 CONCENTRATION
0
100
200
300
400
500
600
700
800
900
1000
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
SO
4

(
M
G
/
L
)
<Plots 1115A&B><Plots 1115A&B>
W1154A SO4 CONCENTRATION
0
100
200
300
400
500
600
700
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
SO
4

(
M
G
/
L
)
<Plots 1115A&B><Plots 1115A&B>
W363 SO4 CONCENTRATION
80
100
120
140
160
180
200
1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
SO
4

(
M
G
/
L
)
SubsidenceSubsidence
„„Initial ground elevation survey in Initial ground elevation survey in
December 2002December 2002
„„Second survey in March 2004Second survey in March 2004
„„No notable ground elevation changesNo notable ground elevation changes
Looking AheadLooking Ahead
„„Planned annual extractions:Planned annual extractions:
––Barrier Wells/RO Feed:Barrier Wells/RO Feed:4670 afy4670 afy
––Acid Wells:Acid Wells:2020 afy2020 afy
RO PlantRO Plant
„„Pilot plant operated through midPilot plant operated through mid --20042004
„„Plant expansion began late 2004Plant expansion began late 2004
„„Construction complete in October 2005Construction complete in October 2005
„„Drinking Water Permit by end 2005Drinking Water Permit by end 2005
„„First water delivery anticipated in early First water delivery anticipated in early
20062006