20080868 Ver 2_Section III D Metals 2021 PCS Creeks Report_20220605

D. METALS
Additional comparisons of summary metals data were conducted and are included here
for information. Tables or figures showing only 2021 values are included in Appendix F (only on
flash drive).
For this report, pairwise comparisons (i.e., Student's t-tests) were run for individual
sediment metals and water column metals to compare average concentrations of pre- versus
post -Mod Alt L years as well as pre- and post -Mod Alt L creeks to control creeks. Pairwise
comparisons also were made within individual creeks to compare average sediment and water
column metals of pre- versus post -Mod Alt L years. However, due to the lack of replicates per
creek, creeks were treated as pseudo -replicates, which decrease the specificity of the statistical
analysis. The need for pseudo -replicates is a problem most commonly associated with
environmental data where true experimental replicates are impossible. In this case, "control"
samples are collected from multiple reference sites and "impact" samples are collected from
multiple impacted sites. In this analysis, data from Jacks Creek, Jacobs Creek, Drinkwater Creek,
Tooley Creek, Huddles Cut, Porter Creek, and DCUT11 were essentially treated as "impacted"
samples and data from all control creeks were treated as control samples. Individual differences
among creeks could skew the data in such a way as to increase the risk of false positive or false
negative statistical findings. For this reason, it is also not possible to statistically evaluate how
metal concentrations change over time within a single creek as only one sample is collected per
creek per year. It is possible to visualize trends, but no additional statistical analyses are possible
on a per -creek basis other than to compare pre -Mod Alt L years to post -Mod Alt L years and treat
each year within a creek as a replicate.
In tabular depictions of the data across multiple years (Table III-D1), the current year is
shown but not included in the calculation of the average for the previous years so that it is readily
apparent how the current year concentration relates to the value of the ongoing average of the
previous years, and how it and the average of all previous years compare to the previous Pamlico
River Estuary study, average continental and marine sediment crust, and the ERL/ERM (the
ERL/ERM guidelines are explained in more detail in Section II-E Q5). Note that when a metal
was not detected, the LOQ/CL/RL (reporting limit/detection limit shown with < in the tables) was
used as a data point for graphs and statistics. However, it is anticipated that as more data are
collected yearly, trends in metal concentrations over time can be visualized to better understand
the potential relationship between metal concentration and time.
1.0 Sediment Metals
The creek sediment samples were also analyzed for bulk density since 2011 and
Total Organic Carbon (TOC) since 2013. Figure III-D1 shows TOC in the sediments for each
creek each year since 2013. TOC in the impact creeks (Porter, Jacks, Jacobs, Tooley, and
DCUT11) and the control creeks (Duck, Long, and Muddy) increased from 2013 to a high in 2016,
TOC declined in these creeks since 2016. The impact creek Drinkwater had its highest TOC in
2019, while the control creeks Little and PA2 had their highest TOC in 2017 and 2021,
respectively. TOC in DCUT19 has been declining from a high in 2013. The predominantly sandy
sediment in Huddles Cut resulted in nearly zero TOC values in all years. With the exception of
DCUT19 in 2013, DCUT11 had the highest TOC values every year followed closely by DCUT19
(Figure III-D1). Bulk density and TOC values are also shown for each creek by year on Table III-
D1. The highest bulk density values occurred in 2011, with the exception of DCUT11, DCUT19,
Broomfield Swamp, and SCUT1, which were not sampled. That year was the final sediment
sample analysis was performed by the Florida Institute of Technology (FIT) lab. The FIT lab dry
III-D-1

sediment density result was volume -based, while the dry sediment density result from the current
lab is based on dry weight of original sample. Each lab used a different ASTM bulk density
method and both labs had to slightly modify the method procedure as the samples were not
"undisturbed" (i.e., a grab sample not a core sample) and the quantities provided to the labs were
also different. Therefore, the 2011 bulk density values were not used in calculation of averages
shown in any table.
One factor that can influence metal availability in aquatic environments is total or
dissolved organic carbon. Metals dissolved in water can readily bind to organic carbon, which
can then limit bioavailability to living organisms through both aqueous and dietary
bioaccumulation pathways (Chen et al., 2016). Therefore, for many benthic environments
enriched in organic carbon where stronger binding of metals may occur in the sediment, these
metals are generally less available for living organisms to accumulate (Chen et al., 2016). Total
organic carbon (TOC) data were available for sediments beginning in 2013 and statistical
evaluation of creeks began in 2017 with additional creek collections added in subsequent years.
All the TOC and metal concentration data (LOQs used for non -detections) were transformed to
the logo and data from control creeks and creeks with post -Mod Alt L data were evaluated with a
simple linear regression to determine whether metals increased or decreased in a linear fashion
with TOC (significance = p < 0.05). Broomfield Swamp Creek was excluded from the analysis
since post -Mod Alt L impacts have not yet occurred for this creek.
Concentrations of all 10 sediment metals significantly increased statistically with
TOC in the control creeks and in Drinkwater Creek. Concentrations for other impact creeks, with
the exception of DCUT11, also significantly increased statistically with TOC but only for some
metals: Jacks Creek (As, Cr, Cu, Zn, Al, and Fe), Jacobs Creek (Ag, As, Cr, Cu, and Mo), Tooley
Creek (As, Cd, Cr, Cu, Mo, Se, and Zn), Huddles Cut (As), and Porter Creek (Cr). With the data
currently available for TOC and water column metals, it does not appear as if creeks with lower
TOC in the sediment have higher water column metal concentration. Huddles Cut, for example,
which has very low TOC, does not have higher water column metal concentration when compared
to Drinkwater Creek, which has high TOC.
Figures III-D2 — III-D8 illustrate average pre- and post -Mod Alt L sediment metal
data for Jacks Creek, Jacobs Creek, Drinkwater Creek, Tooley Creek, Huddles Cut, Porter Creek,
and DCUT11, respectively, by year. A detailed discussion of pre- and post -Mod Alt L for individual
impact creeks significant differences are presented in Section II-E.
Table III-D1 shows the sediment metals values by year for each monitored creek
and the means and standard deviations of all years previous to the current year. For comparison,
values for the metals sampled in a 1998 study of the Pamlico River estuary, a 1984 study on
average marine sediment crust, and a 1995 study on continental crust are also shown. These
previous studies show Al, Ag, Cd, Cr, Se, and Zn higher in the Pamlico River estuary than in
marine sediment crust; for Ag, As, Cd, Cu, Mo, and Se in some creeks in the PCS study, including
control creeks, this relationship seems to be also true as these metal means were higher than the
1998 Pamlico River estuary values. Jacks Creek had pre -and post -Mod Alt L mean values for
Cd, Mo, and Se above the 1998 Pamlico River estuary values, pre -and post -Mod Alt L mean
values were also above the 1998 Pamlico River estuary values for Cd and Se in Jacobs Creek
and Tooley Creek. Pre -and post -Mod Alt L mean values at DCUT11 for Se and at Drinkwater
Creek for Cd were also above the 1998 Pamlico River estuary values. Control creek means for
all years for Little Creek, Long Creek, Muddy Creek, DCUT19, and Duck Creek were also above
the Pamlico Estuary values for Cd, Mo, and Se. The Cd, Mo, and Se means for the corresponding
Jacks Creek, Jacobs Creek, and Tooley Creek pre- and post -Mod Alt L years in the control creeks
III-D-2

also were above the 1998 Pamlico Estuary values. Control creek PA2 had a value for Se only
that was above the 1998 Pamlico River estuary value for all years. Post Mod Alt L values for Se
in DCUT11 and Cd in Drinkwater Creek were also above the 1998 Pamlico River Estuary values.
However, changes in laboratory methods and laboratory equipment may contribute to some of
the differences when results are compared to the earlier studies.
2.0 Water Column Metals
Figures III-D9 a — d illustrate average water column metals for all creeks in different
combinations: a) pre- and post -Mod Alt L water column metal data for Jacks Creek, Jacobs Creek,
Drinkwater Creek, Tooley Creek, Huddles Cut, Porter Creek, and DCUT11 combined across
years, b) average pre -Mod Alt L creek concentrations combined and compared to controls, c)
average post -Mod Alt L creek concentrations combined and compared to controls, and d) average
post -Mod Alt L creek 2021 concentrations only combined and compared to controls. No increases
in metal water column concentrations in post -Mod Alt L years were significant statistically relative
to pre -Mod Alt L years.
Table III-D2 displays the water column metals results on a per creek basis with
years divided into pre- and post -Mod Alt L categories and for comparison shows values for total
and dissolved metals sampled in 1998 in three of the same creeks in the current study, a 1983
study on trace elements in the world's oceans, a 1995 report on trace elements in natural waters,
and current US EPA national recommended water quality criteria for aquatic life (freshwater and
marine, acute and chronic for four of the 10 metals measured in this study and partial criteria for
another four in this study). In every creek, at least two of six metals with means higher than earlier
studies (As, Cr, Cu, Mo, Se, and Zn) have occurred (averages for Fe were lower than earlier
studies in all creeks); higher averages for all six metals have occurred in post -Mod Alt L
Drinkwater Creek while three control creeks have also had higher means for all six metals (Little,
PA2, and Duck). For a number of the six metals, averages in many of the creeks also were higher
than the world's oceans or rivers, and higher than the values collected from the three local creeks
in the 1998 study. All creek averages were above chronic marine aquatic life criteria for Cu, and
with the exception of pre -Mod L DCUT11, pre -Mod Alt L Cu averages in Broomfield Swamp,
Drinkwater, and Jacobs creeks and post -Mod L Huddles Cut exceeded acute marine aquatic life
criteria, as did the averages in five control creeks (SCUT1, Little, PA2, Long, and Muddy).
As noted in the sediment discussion above, changes in laboratory methods and
laboratory equipment may contribute to some of the noted differences when results are compared
to the earlier studies.
III-D-3

300
250
200
150
100
50
0
Total Organic Carbon in sediments by creek and year
1
i
iil
1
i
1.I
11
�ti away o\e4 as L�" 6 ��
Q O�,cN� �o `o eJ) aa\z v QLJ Q -, o�
•G
Asterisks indicate control creeks
2013 ■ 2014 ■ 2015 ■ 2016 ■ 2017 ■ 2018 2019 ■ 2020 ■ 2021
Figure III-D1. Total organic carbon values in each study creek each year since 2013.
III-D-4

120
100
in
W
_ 80
Z
0
60
0
cc
O
w
c
X
X
X
JACKS CREEK
XCr -Zn XCr -Zn
Reported as(µg/g
Pre -Mod Alt L Years
X
40 X
20
0
X
Post -Mod Alt L Years
X
X
a
1998 2000 2001 2002 2003 2004 2005 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
JACKS CREEK
•As Cu♦•Ma ■As Co♦•Mo
40 Reported as {µg/g
35
J 30
H
w
25
H
z
0 20
0
r 15 ♦
0
CC w
10
5
0
♦
♦
♦
•
Pre -Mod Alt LYears
• • • • • •
• • • • v V
• • • : • • •
Post -Mod Alt L Years
•
•
•
•
♦
♦
• •
•
4
•
•
c
♦
• •
IP ■
•
1998 2000 2001 2002 2003 2004 2005 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
REPORTED SEDIMENT METALS
7
6
5
4
3
2
+
1 ♦
0
+ •
♦
+
♦
+
•
+
♦
JACKS CREEK
•Ag ♦Cd +Se •Ag ♦Cd +Se
Reported as(µg/g
Pre -Mod Alt LYears
+
1998 2000 2001 2002 2003 2004 2005 2011 2012
+
♦
+
♦
+
+
Post -Mod Alt L Years
+
•
f
2013 2014 2015 2016
+
T
+
f
+
+
t
b
+
2017 2018 2019 2020 2021
REPORTED SEDIMENT METALS
8
7
6
5
4
3 X X X
2
1
X
X
X
X
JACKS CREEK
—Al XFe —Al xFe
Reported as(%)
Pre -Mod Alt L Years
X
x X
Post -Mod Alt L Years
X
X
X
X
X
d
X
o ;•E
1998 2000 2001 2002 2003 2004 2005 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Figure III-D2 a - d. Reported sediment metals (pg/g) for Jacks Creek pre- and post -Mod Alt L through 2021. Average concentration of Ag, Mo, and Se in Jacks Creek was statistically higher (p < 0.05) in
post -Mod Alt L years relative to pre -Mod Alt L years. LOQ/CURL (shown in red) used if metal was not detected or detected below LOQ/CL/RL. Significant changes to Ag and Mo reflect changes in LOQ
rather than changes in detected concentrations of these sediment metals.
III-D-5

REPORTED SEDIMENT METALS
120
100
80
60 X
40
20
0
2011
Pre -Mod Alt LYears
x
x
2012 2013
JACOBS CREEK
XCr -Zn XCr -Zn
Reported as (µg/g)
Post -Mod Alt LYears
x
x
x
x
x
a
x
2014 2015 2016 2017 2018 2019 2020 2021
YEAR
REPORTED SEDIMENT METALS
40
35
30
25
20
15
l
10
■
5
•
0
2011
Pre -Mod Alt LYears
1
■
•
■
■
•
2012 2013
JACOBS CREEK
•As Cu••Mo •As •Cu •Mo
Reported as (µg/g}
Post -Mod Alt L Years
1
■
•
•
■
1 ■
1
I
1
•
■
1
■
l
•
■
c
1
•
■
2014 2015 2016 2017 2018 2019 2020 2021
YEAR
REPORTED SEDIMENT METALS
7
6
5
4
3
2
1
0
Pre -Mod Alt LYears
i
•
+
t
JACOBS CREEK
•Ag •Cd +Se •Ag •Cd +Se
Reported as (µg/g)
Post -Mod Alt LYears
+
4
2011 2012 2013 2014
+
•
i
+
f
+
f
+
f
+
f
b
+
f
2015 2016 2017 2018 2019 2020 2021
YEAR
REPORTED SEDIMENT METALS
8
7
6
5
4
X
3
2
1
Pre -Mod Alt LYears
x
0 }�
2011 2012 2013
JACOBS CREEK
—Al X Fe —Al X Fe
Reported as (%)
Post -Mod Alt LYears
X
x
X
x
x
x
x
d
2014 2015 2016 2017 2018 2019 2020 2021
YEAR
Figure III-D3 a - d. Reported sediment metals (pg/g) for Jacobs Creek pre- and post -Mod Alt L through 2021. Average concentration of Ag, Cd, Mo, and Se in Jacobs Creek was statistically higher (p < 0.05) in post -
Mod Alt L years relative to pre -Mod Alt L years. LOQ/CL/RL (shown in red) used if metal was not detected or detected below LOQ/CURL. Significant changes to Ag, Cd, and Mo reflect changes in LOQ rather than
changes in detected concentrations of these sediment metals.
III-D-6

O
5-
REPORTED SEDIMENT METALS
120
100
80
X
60
40
20
40
35
W
25
Z
W
E 20
N
0
0
Pre -Mod Alt L
Years
X
Post -Mod Alt
L Years
x
DRINKWATER CREEK
XCr -Zn *Cr -Zn
Reported as (µg/g)
x
x
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
cc 15 •
10
■
s
•
0
2011
Pre -Mod Alt L
Years
♦
■
•
2012
Post -Mod Alt
L Years
2013
YEAR
DRINKWATER CREEK
a
c
7
6
Q ▪ 5
H
Z 4
W
E
W
0 3
W
H
cc
O
EL: 2
cc
1
0+
Pre -Mod Alt L
Years
4
+
2011 2012
Post -Mod Alt
L Years
DRINKWATER CREEK
•Ag ♦Cd +Se •Ag ♦Cd +Se
Reported as(µg/g)
+
+
+
•
+
+
+
• i 4
2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR
b
DRINKWATER CREEK
•As ♦Cu •Mo •As ♦Cu •Mo —Al XFe —AI XFe
Reported as (µg/g)
•
♦
■ ■
•
• 1
8 Reported as(%)
7
•
•
2014 2015
•
A
•
• • • •
2 • ■ ■
2016 2017
♦
•
■
2018 2019 2020 2021
, 6
J
Q.
F
W
5
cZ
0 4
W
N
-3X
0
w
CC 2
Pre -Mod Alt L
Years
x
Post -Mod Alt
L Years
x
x
•
X
x
0 �E
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR YEAR
d
Figure III-D4 a - d. Reported sediment metals (pg/g) for Drinkwater Creek pre- and post -Mod Alt L through 2021. Average concentration of Ag, Cd, Mo, and Se in Drinkwater Creek was statistically higher (p <
0.05) in post -Mod Alt L years relative to pre -Mod Alt L years. LOQ/CL/RL (shown in red) used if metal was not detected or detected below LOQ/CURL. Significant changes to Ag, Cd, and Mo reflect changes
in LOQ rather than changes in detected concentrations of these sediment metals.
III-D-7

REPORTED SEDIMENT METALS
120
100
80
60
40
20
0
40
35
30
H
L 25
z
z
L
p 20
0
i 15
0
ce
10
5
0
X
X
1998 2000
♦
■
•
•
Pre -Mod Alt LYears
X
2001
X
X
TOOLEY CREEK
XCr =Zn Crx=Zn
Reported as (Reg)
Post -Mod Alt L Years
X
X
X
. X X
X
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
TOOLEY CREEK
•As Cu♦•Mo •As ♦Cu •Mo
Reported as (Reg)
Pre -Mod Alt L Years
•
•
♦
■
■ ■
• • • •
■
Post -Mod Alt L Years
•
•
• •
• • •
• • • • V •
•
• • •
1
a
X
X
2020 2021
• •
•
i •
1998 2000 2001 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
a
c
REPORTED SEDIMENT METALS
REPORTED SEDIMENT METALS
7
6
5
4
3
2
• •
1 +
0
1998 2000
8
7
6
5
4
3 X X
2
1
0
1998 2000
TOOLEY CREEK
•Ag ♦Cd +Se ♦Ag ♦Cd +Se
Reported as(µg/g)
Pre -Mod Alt L Years
•
+
2001
•
•
+
Post -Mod Alt L Years
•
+
•
•
+
♦
+
•
+
f
f
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Pre -Mod Alt LYears
X
2001
X
X
TOOLEY CREEK
—Al XFe —Al
Reported as (%)
2010 2011
Post -Mod Alt L Years
X
x Fe
x
X
X
04
2012 2013 2014 2015 2016 2017 2018 2019
+
f
2020 2021
X
2020 2021
b
d
Figure III-D5 a - d. Reported sediment metals (pg/g) for Tooley Creek pre- and post -Mod Alt L through 2021. Average concentration of Ag, Mo, and Se in Tooley Creek was statistically higher (p < 0.05) in post -
Mod Alt L years relative to pre -Mod Alt L years. LOQ/CURL (shown in red) used if metal was not detected or detected below LOQ/CL/RL. Significant changes to Ag and Mo reflect changes in LOQ rather than
changes in detected concentrations of these sediment metals.
III-D-8

120
100
Q
80
60
H
O
40
20
X
Pre -Mod Alt LYea rs
0 R )
1998 2000 2001 2007 2008 2009
HUDDLES CUT
XCr -Zn:Cr -Zn
Reported as (µg/g)
Post -Mod Alt LYears
a
)14
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
HUDDLES CUT
•As ♦Cu •Mo •As ♦Cu •Mo
70 Reported as (µg/g)
60
4 50
2
z 40
2
30
O
a
LU 20
10
0
•
•
Pre -Mod Alt LYea rs
•
■
• •
■ 1 1
1998 2000 2001 2007
2008
2009
•
Post -Mod Alt L Years
•
c
• 1 ! � ■ i • i i i • •
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
7
6
1
Pre -Mod Alt LYea rs
♦ +
+
+
o • • • ! ! !
1998 2000 2001 2007 2008 2009
HUDDLES CUT
♦Ag ♦Cd +Se ♦Ag ♦Cd +Se
Reported as (Pg/R)
Post -Mod Alt LYea rs
e
+
•
+ f
* * f f
* * ♦ 4 ♦ f
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
8
7
6
2 5
z
4
0
0
1— 3
O
d
L.„
2
1
0
X
X
Pre -Mod Alt LYears
HUDDLES CUT
—Al XFe —Al XFe
Reported as(%)
Post -Mod Alt LYea rs
X
1998 2000 2001 2007 2008 2009 2010 2011 2012 2013 2014
2015 2016 2017 2018 2019 2020
d
2021
Figure III-D6 a - d. Reported sediment metals (pg/g) for Huddles Cut pre- and post -Mod Alt L through 2021. Average concentration of Ag in Huddles Cut was statistically higher (p < 0.05) in post -Mod Alt L years relative
to pre -Mod Alt L years. LOQ/CURL (shown in red) used if metal was not detected or detected below LOQ/CL/RL. Significant changes to Ag reflect changes in LOQ rather than changes in detected concentrations of
these sediment metals.
III-D-9

120
100
5
2 80
z
5
0
." , 60
0
F
pc
a 40
ce
20
x
0
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR
PORTER CREEK
X Cr - Zn )C Cr -Zn
Reported as Wig)
Pre -Mod Alt LYears
x
Post -Mod Alt L Years
X
x
a
rX'
REPORTED SEDIMENTMETALS
40
35
30
25
20
•
15
10
■
5
•
0
2011
•
PORTER CREEK
•As Cu••Mo •As •Cu •Mo
Reported as (pg/g)
Pre -Mod Alt LYears
•
! ■ i V
•
Post -Mod Alt L Years
•
• •
■
V
•
•
■
c
• •
•
•
■ ■ ■
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR
7
6
14
0♦
PORTER CREEK
♦Ag •Cd +Se ♦Ag •Cd +Se
Reported as(pg/g)
Pre -Mod Alt LYears
f
Post -Mod Alt LYears
+
•
+
•
•
+
+
f
+
A
b
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR
8
7
6
r
2 5
z
z
g X
p 4
0
s 3
O
a
c,
2
R
1
PORTER CREEK
—Al X Fe —Al x Fe
Reported as (%)
Pre -Mod Alt LYears
o4
X
Post -Mod Alt L Years
R
X
Xi
d
X
0 -
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
YEAR
Figure III-D7 a - d. Reported sediment metals (pg/g) for Porter Creek pre- and post -Mod Alt L through 2021. Average concentrations of Ag, Cd, Cu, Mo, and Se in Porter Creek were statistically higher (p < 0.05) in post -Mod
Alt L years relative to pre -Mod Alt L years. LOQ/CL/RL (shown in red) used if metal was not detected or detected below LOQ/CURL. Significant changes to Ag, Cd, and Mo reflect changes in LOQ rather than changes in
detected concentrations of these sediment metals.
III-D-10

120
J 100
Q
cw
C
H 80
Z
w
2
Lw 60
in
O
w
H
° 40
O
a
cc
DCUT11
XCr -Zn XCr -Zn
Reported as (µg/g}
Pre -Mod Alt LYears
X
20 X X
X X
0
2013 2014 2015 2016 2017
YEAR
a
Post -Mod Alt L Years
X X
REPORTED SEDIMENT METALS
7
6
5
4
3
+
2
1 •
0
2018 2019 2020 2021 2013
40
35
w
Q 30
H
w
H 25
Z
w
E20 •
w
vs
a 15
H
c[
0
c▪ 10• •
II • •
5
■
0
2013
2014 2015
DCUT11
■As •Cu •Mo •As •Cu •Mo
Reported as(µg/g}
Pre -Mod Alt LYears
•
•
■
•
•
■
2016 2017
YEAR
Post -Mod Alt L Years
•
•
■
■
•
•
■
c
•
•
■
2018 2019 2020 2021
2014
4
2015
DCUT11
♦Ag •Cd +Se ♦Ag ♦Cd +Se
Reported as (µg/g)
Pre -Mod Alt LYears
+
Post -Mod Alt L Years
A
+
+
f •
b
+
2016 2017 2018 2019 2020 2021
YEAR
8
7
1
0EE
2013
2014 2015
DCUT11
— Al XFe — Al XFe
Reported as(%)
Pre -Mod Alt LYears
2016 2017
YEAR
d
Post -Mod Alt L Years
X X X
2018 2019 2020 2021
Figure III-D8 a - d. Reported sediment metals (pg/g) for DCUT11 pre- and post -Mod Alt L through 2021. LOQ/CL/RL (shown in red) used if metal was not detected or detected below LOQ/CL/RL.
III-D-11

WATER COLUMN
AVERAGE WATER METALSACROSSALL SITES
1200.0
1000.0
800.0
600.0
400.0
200.0
d Pre -Mod Alt L 0 Post -Mod Alt L
0
0
0.0 0 0 () 0 0 4
Ag As Cd Cr Cu Fe Mo Se Zn
METALS (ALL YEARS COMBINED)
a
AVERAGE WATER METALSACROSSALLSITES (µfL)
1200.0
1000.0
800.0
600.0
400.0
200.0
0 Post -Mod Alt L ❑ Control
0
0.0 0 0 0 ❑ ❑ 0
Ag As Cd Cr Cu Fe Mo Se Zn
METALS (ALL YEARS COMBINED)
c
AVERAGE WATER METALS ACROSSALL SITES (µjL)
1200.0
1000.0
800.0
600.0
400.0
200.0
0.0 in in
Ag As
0 Pre -Mod Alt L ❑ Control
Cd Cr Cu Fe Mo
METALS (ALL YEARS COMBINED)
Se Zn
b
AVERAGE WATER METALS ACROSSALL SITES (µIL)
1200.0
1000.0
800.0
600.0
400.0
200.0
0 Post -Mod Alt L ❑ Control
0
CI
0.0 0 ❑ ❑ ❑ ❑
Ag As Cd Cr Cu Fe Mo
METALS (2021 DATA ONLY)
Cl
Se Zn
d
Figure III-D9 a — d. Average water column metals (µg/L) for all control creeks combined across years and creeks with both pre- and post -Mod Alt L data combined across creeks and
years. 9a) Average water column metals for pre -Mod Alt L years relative to post -Mod Alt L years. 9b) Average water column metals for pre -Mod Alt L creeks relative to control creeks.
9c) Average water column metals for post -Mod Alt L creeks relative to control creeks. 9d) Average water column metals for post -Mod Alt L creeks relative to control creeks, 2021
concentrations only. No statistical elevations in average water column metals were present in post -Mod Alt L creeks relative to control or pre -Mod Alt L creeks. LOQ/CL/RL used if metal
was not detected or detected below LOQ/CL/RL.
III-D-12

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III-D-13

Se (Ng/g) Zn (Ng/g)
O i
u,
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Table III-D1 (concluded).
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Acute Freshwater
Chronic Marine
Acute Marine
III-D-15

WATER COLUMN TOTAL METALS a
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Acute Freshwater
Chronic Marine
Acute Marine
5
III-D-16