20080868 Ver 2_Cover and TOC 2020 PCS Creeks Report_20210701

ANNUAL CREEKS REPORT
2020 DATA COLLECTION YEAR
PCS PHOSPHATE COMPANY, INC.
Prepared for:
PCS Phosphate Company, Inc.
Environmental Affairs Department
Aurora, NC
Prepared by:
CZR Incorporated, Wilmington, NC
Dr. Suelen Tullio, Principal Investigator (Water Quality)
Dr. Sid Mitra, Contributor (DOC/TDN)
East Carolina University
Greenville, NC
Mr. Larry Eaton, Contributor (Macroinvertebrates)
Eaton Scientific, LLC
Raleigh, NC
J U LY 2021

ANNUAL CREEKS REPORT
FOR 2020 DATA COLLECTION YEAR
PCS PHOSPHATE COMPANY, INC.
Prepared for:
PCS Phosphate Company, Inc.
Environmental Affairs Department
Aurora, North Carolina
Prepared by:
CZR Incorporated
Wilmington, North Carolina
and
Dr. Suelen Tullio, Principal Investigator (Water Quality)
Dr. Sid Mitra, Contributor (DOC, TDN)
East Carolina University
Greenville, North Carolina
Mr. Larry Eaton, Contributor (Macroinvertebrates)
Eaton Scientific LLC
Raleigh, North Carolina
July 2021
Cover photos (upper right top to lower left bottom):
New Huddles Cut rain gauge location
Gizzard shad collected in Little Creek, 22 April 2020
Benthos sweep collection upstream Tooley Creek, 20 May 2020
DCUT11 view upstream from DC11W1B, 22 September 2020
Porter Creek downstream Aqua TROLL (PCS2), 22 September 2020

TABLE OF CONTENTS
LIST OF FIGURES viii
LIST OF TABLES xxiv
LIST OF APPENDICES xxix
EXECUTIVE SUMMARY xxx
I. INTRODUCTION I-A-1
A. BACKGROUND I-A-1
1.0 Drainage Basin Acreage Adjustments 1-A-2
2.0 Pre- and Post -Mod Alt L Year Data Set Revisions 1-A-3
B. CREEKS MONITORED IN 2020 I-B-1
C. CUMULATIVE AND 2020 MINING, MINE -RELATED ACTIVITIES, AND DRAINAGE BASINS I-C-1
D. DROUGHT I-D-1
E. EXTREME EVENTS OR STORMS I-E-1
F. RAINFALL I-F-1
G. TAR RIVER DISCHARGE I-G-1
II. CORPS PERMIT SPECIAL CONDITION S - SIX QUESTIONS II-A-1
A. QUESTION 1-HAS MINING ALTERED THE AMOUNT OR TIMING OF WATER FLOWS WITHIN THE CREEKS? II-A-1
1.0 History of Flow Monitoring II-A-1
2.0 Requests from the 2019 Science Panel Meeting II-A-3
a. 2020 Flow Videos, Observations, and Summary II-A-3
b. Skaggs 2006 simulations for Huddles Cut and CZR observations II-A-5
c. Unobserved flow II-A-6
i. Jacks Creek Pre- and Post -Mod Alt L I I-A-6
ii. Drinkwater Creek Pre- and Post -Mod Alt L I I-A-7
iii. Porter Creek Pre- and Post -Mod Alt L I I-A-7
iv. DCUT11 Creek Pre- and Post -Mod Alt L I I-A-7
d. Water Depth II-A-8
B. QUESTION 2-HAS MINING ALTERED THE GEOMORPHIC OR VEGETATIVE CHARACTER OF THE CREEKS? II-B-1
C. QUESTION 3- HAS MINING ALTERED THE FORAGE BASE OF THE CREEKS? II-C-1
1.0 Fish II-C-1
2.0 Fish Guilds II-C-3
a. Pre -Mod Alt L Creek II-C-4
i. Broomfield Swamp Creek II-C-4
b. Post -Mod Alt L Creeks I I-C-4
i. Jacks Creek I I-C-4
ii. Jacobs Creek I I-C-5
iii. Drinkwater Creek II-C-5
iv. Tooley Creek I I-C-5
v. Huddles Cut II-C-6
vi. Porter Creek II-C-6
vii. DCUT11 II-C-6
c. Mod Alt L Control Creeks I I-C-6
i. SCUT1 I I-C-6
ii. Little Creek II-C-7
iii. PA2 II-C-7
iv. Long Creek II-C-7
v. Muddy Creek II-C-7
vi. DCUT19 II-C-8
I I

vii. Duck Creek II-C-8
3.0 Grass Shrimp II-C-8
4.0 Penaeid Shrimp and Blue Crab II-C-9
5.0 Macroinvertebrates II-C-9
6.0 Macroinvertebrate Guilds II-C-12
D. QUESTION 4- HAS MINING ALTERED THE USE OF THE CREEK BY MANAGED FISH? II-D-1
E. QUESTION 5- HAS MINING INCREASED CONTAMINATE [SIC] LEVELS WITHIN CREEK SEDIMENTS TO LEVELS THAT COULD IMPACT FISH
OR INVERTEBRATES? II-E-1
F. QUESTION 6-HAS MINING ALTERED OVERALL WATER QUALITY WITHIN CREEKS? II-F-1
III. ADDITIONAL DISCUSSION OF SUMMARY RESULTS BY PARAMETER III-A-1
A. SALINITY AND ENVIRONMENTAL VARIABLES III-A-1
1.0 Environmental Variables III-A-1
a. Salinity and Tar River Discharge III-A-1
b. Salinity and Water Depth III-A-2
c. Salinity and Rainfall III-A-2
d. Salinity and Wind III-A-2
2.0 Interannual and/or Monthly Comparisons III-A-4
a. Broomfield Swamp Creek and SCUT1 (control) III-A-4
3.0 Pre/Post- Mod Alt L Comparisons III-A-4
a. Jacks Creek III-A-5
b. South Creek (SS1) (control) III-A-6
c. Little Creek (control) III-A-6
d. Jacobs Creek III-A-6
e. PA2 (control) III-A-7
f. Drinkwater Creek III-A-8
g. Long Creek (control) III-A-8
h. Tooley Creek III-A-9
i. Pamlico River (PS1) (control) III-A-9
j. Huddles Cut III-A-10
k. Porter Creek III-A-11
I. Durham Creek DCS1 (control), DCUT11, and DCUT19 (control) III-A-12
m. Duck Creek (control) III-A-12
4.0 Summary and Conclusions 11-A-13
B. WETLAND HYDROLOGY III-B-1
1.0 Wetland Hydroperiods by Creek III-B-1
a. Broomfield Swamp Creek III-B-1
b. SCUT1 III-B-1
c. Jacks Creek III-B-1
d. Jacobs Creek III-B-2
e. Drinkwater Creek III-B-2
f. Long Creek (control) III-B-2
g. Tooley Creek III-B-3
h. Huddles Cut III-B-3
i. Main Prong III-B-3
ii. West Prong III-B-4
i. Porter Creek III-B-4
j. DCUT11 III-B-4
k. DCUT19 (control) III-B-5
I. Duck Creek (control) III-B-5
2.0 PCS Deep Wells and Water Levels in CZR Wetland Level TROLLS 111-8-5
a. Methods III-B-5
b. Porter Creek Results III-B-6
c. Conclusions III-B-7
C. WATER QUALITY III-C-1
1.0 History III-C-1

a. Description of Analysis Techniques III-C-1
2.0 Results III-C-3
a. Temporal variability (2012-2020) in all creeks III-C-3
i. Broomfield Swamp Creek water quality station BSCWQ1 III-C-4
ii. Broomfield Swamp Creek water quality station BSCWQ2 III-C-4
iii. Broomfield Swamp Creek water quality station BSCWQ3 III-C-4
iv. SCUT1 water quality station SC1WQ1 III-C-4
v. SCUT1 water quality station SC1WQ2 III-C-4
vi. SCUT1 water quality station SC1WQ3 III-C-4
vii. Jacks Creek water quality station JWQ1 III-C-4
vii. Jacks Creek water quality station JWQ2 III-C-4
viii. Little Creek water quality station LCWQ1 III-C-5
ix. Little Creek water quality station LCWQ2 III-C-5
x. Jacobs Creek water quality station JCBWQ1 III-C-5
xi. Jacobs Creek water quality station JCBWQ2 III-C-5
xii. PA2 water quality station PA2WQ1 III-C-5
xiii. PA2 water quality station PA2WQ2 III-C-5
xiv. Drinkwater Creek water quality station DWWQ1 III-C-5
xv. Drinkwater Creek water quality station DWWQ2 III-C-6
xvi. Long Creek water quality station LOCWQ1 III-C-6
xvii. Long Creek water quality station LOCWQ2 III-C-6
xvix. Tooley Creek water quality station TWQ1 III-C-6
xx. Tooley Creek water quality station TWQ2 III-C-6
xxi. Tooley Creek water quality station TWQ3 III-C-6
xxii. Huddles Cut water quality station HWQ1 III-C-6
xxiii. Huddles Cut water quality station HWQ2 III-C-6
xxiv. Huddles Cut water quality station HWQ3 III-C-7
xxv. Huddles Cut water quality station HWQ4 III-C-7
xxvi. Porter Creek water quality station PCWQ1 III-C-7
xxvii. Porter Creek water quality station PCWQ2 III-C-7
xxviii. DCUT11 water quality station DC11WQ1 III-C-7
xxix. DCUT19 water quality station DC19WQ1 III-C-7
xxx. Duck Creek water quality station DKCWQ1 III-C-7
xxxi. Duck Creek water quality station DKCWQ2 III-C-7
b. Spatial variability (2012-2020) in all creeks III-C-8
i. Depth III-C-8
ii. Temperature III-C-8
iii. Salinity III-C-8
iii. Conductivity III-C-9
iv. Turbidity III-C-9
v. Dissolved oxygen III-C-9
vi. pH III-C-9
vii. NH4 (ammonium) III-C-9
viii. NO3 (nitrate) III-C-9
ix. DKN (dissolved Kjeldahl nitrogen) III-C-9
xi. PN (particulate nitrogen) III-C-9
xii. Total dissolved nitrogen III-C-9
xiii. PO4 (orthophosphate) III-C-10
xv. PP (particulate phosphate) III-C-10
xvi. Chlorophyll a III-C-10
xviii. DOC (Dissolved organic carbon) III-C-10
c. Interannual Variability (Pre- and Post -Mod Alt L Creeks) III-C-10
i. Jacks Creek III-C-10
ii. Jacobs Creek III-C-10
iii. Drinkwater Creek III-C-11
iv. Tooley Creek III-C-11
v. Huddles Cut III-C-11
vi. Porter Creek III-C-11
iv

vii. DCUT11 III-C-11
3.0 Summary and Conclusions III-C-11
a. Temporal variability III-C-11
b. Spatial variability III-C-12
D. METALS III-D-1
1.0 Sediment Metals III-D-1
2.0 Water Column Metals III-D-3
E. VEGETATION III-E-1
1.0 Results and Discussion III-E-1
a. Broomfield Swamp Creek III-E-1
b. SCUT1 (control) III-E-2
c. Jacks Creek III-E-2
d. Jacobs Creek III-E-3
e. Drinkwater Creek III-E-3
f. Tooley Creek III-E-4
g. Long Creek (control) III-E-4
h. Huddles Cut Main Prong III-E-5
i. Huddles Cut West Prong III-E-5
j. Porter Creek III-E-5
k. DCUT11 III-E-6
I. DCUT19 (control creek) III-E-6
m. Duck Creek (control creek) III-E-6
2.0 Summary and Conclusions III-E-7
F. FISH III-F-1
1.0 Results and Discussion III-F-1
a. Pre -Mod Alt L Creeks III-F-1
i. Broomfield Swamp Creek III-F-1
b. Post -Mod Alt L Creeks III-F-2
i. Jacks Creek III-F-2
ii. Jacobs Creek III-F-4
iii. Drinkwater Creek III-F-5
iv. Tooley Creek III-F-7
v. Huddles Cut III-F-9
vi. Porter Creek III-F-10
vii. DCUT11 III-F-12
c. Mod -Alt L Control Creeks III-F-12
i. SCUT1 III-F-12
ii. Little Creek III-F-13
iii. PA2 III-F-14
iv. Long Creek III-F-14
v. Muddy Creek III-F-15
vii. DCUT19 III-F-16
vii. Duck Creek III-F-16
2.0 Summary and Conclusions III-F-17
G. BENTHOS III-G-1
1.0 Results and Discussion of Sweep and Ponar Data III-G-1
a. Pre -Mod Alt L Creeks Sweep and Ponar Grab Data III-G-3
b. Post -Mod Alt L Creeks Sweep and Ponar Grab Data III-G-3
i. Jacks Creek Upstream Sweeps III-G-3
ii. Jacks Creek Downstream Sweeps III-G-4
iii. Jacks Creek Upstream Ponar Grabs III-G-5
iv. Jacks Creek Downstream Ponars III-G-5
i. Jacobs Creek Upstream Sweeps III-G-6
ii. Jacobs Creek Downstream Sweeps III-G-6
iii. Jacobs Creek Upstream Ponar Grabs III-G-7
iv. Jacobs Creek Downstream Ponar Grabs III-G-7
i. Drinkwater Creek Upstream Sweeps III-G-8

ii. Drinkwater Creek Downstream Sweeps III-G-9
iii. Drinkwater Creek Upstream Ponar Grabs III-G-9
iv. Drinkwater Creek Downstream Ponar Grabs III-G-10
i. Tooley Creek Upstream Sweeps III-G-10
ii. Tooley Creek Downstream Sweeps III-G-11
iii. Tooley Creek Upstream Ponar Grabs III-G-12
v. Tooley Creek Downstream Ponar Grabs III-G-12
i. Huddles Cut Upstream Sweeps III-G-13
ii. Huddles Cut Downstream Sweeps III-G-13
iii. Huddles Cut Upstream Ponar Grabs III-G-14
iv. Huddles Cut Downstream Ponar Grabs III-G-14
i. Porter Creek Upstream Sweeps III-G-15
ii. Porter Creek Downstream Sweeps III-G-16
iii. Porter Creek Upstream Ponar Grabs III-G-16
iv. Porter Creek Downstream Ponar Grabs III-G-17
i. DCUT11 Upstream Sweeps III-G-17
ii. DCUT11 Downstream Sweeps III-G-18
iii. DCUT11 Upstream Ponar Grabs III-G-18
iv. DCUT11 Downstream Ponar Grabs III-G-19
c. Control Creeks Sweep and Ponar Grab Data III-G-19
i. Little Creek Upstream Sweeps III-G-20
ii. Little Creek Downstream Sweeps III-G-20
iii. Little Creek Upstream Ponar Grabs III-G-21
iv. Little Creek Downstream Ponar Grabs III-G-21
i. PA2 Upstream Sweeps III-G-22
ii. PA2 Downstream Sweeps III-G-22
iii. PA2 Upstream Ponar Grabs III-G-22
iv. PA2 Downstream Ponar Grabs III-G-23
i. Long Creek Upstream Sweeps III-G-23
ii. Long Creek Downstream Sweeps III-G-24
iii. Long Creek Upstream Ponar Grabs III-G-24
iv. Long Creek Downstream Ponar Grabs III-G-24
i. Muddy Creek Upstream Sweeps III-G-25
ii. Muddy Creek Downstream Sweeps III-G-25
iii. Muddy Creek Upstream Ponar Grabs III-G-25
iv. Muddy Creek Downstream Ponar Grabs III-G-26
i. DCUT19 Upstream Sweeps III-G-26
ii. DCUT19 Downstream Sweeps III-G-26
iii. DCUT19 Upstream Ponar Grabs III-G-27
iv. DCUT19 Downstream Ponar Grabs III-G-27
i. Duck Creek Upstream Sweeps III-G-27
ii. Duck Creek Downstream Sweeps III-G-28
iii. Duck Creek Upstream Ponar Grabs III-G-28
iv. Duck Creek Downstream Ponar Grabs III-G-29
2.0 Ponar Grabs Benthic Feeding Guild and Trophic Level Results III-G-29
a. Post -Mod Alt L Creeks Guild Data from Ponar Grabs III-G-30
i. Jacks Creek Upstream Guilds/Trophic Levels III-G-30
ii. Jacks Creek Downstream Guilds/Trophic Levels III-G-30
iii. Jacobs Creek Upstream Guilds/Trophic Levels III-G-31
iv. Jacobs Creek Downstream Guilds/Trophic Levels III-G-32
v. Drinkwater Creek Upstream Guilds/Trophic Levels III-G-32
vi. Drinkwater Creek Downstream Guilds/Trophic Levels III-G-33
vii. Tooley Creek Upstream Guilds/Trophic Levels III-G-34
viii. Tooley Creek Downstream Guilds/Trophic Levels III-G-34
ix. Huddles Cut Upstream Guilds/Trophic Levels III-G-35
x. Huddles Cut Downstream Guilds/Trophic Levels III-G-36
xi. Porter Creek Upstream Guilds/Trophic Levels III-G-36
xii. Porter Creek Downstream Guilds/Trophic Levels III-G-37
vi

xiii. DCUT11 Upstream Guilds/Trophic Levels III-G-38
xiv. DCUT11 Downstream Guilds/Trophic Levels III-G-38
b. Control Creeks Guild/Trophic Level Data from Ponar Grabs III-G-39
i. Little Creek Upstream Guilds/Trophic Levels III-G-39
ii. Little Creek Downstream Guilds/Trophic Levels III-G-39
iii. PA2 Upstream Guilds/Trophic Levels III-G-39
iv. PA2 Downstream Guilds/Trophic Levels III-G-39
v. Long Creek Upstream Guilds/Trophic Levels III-G-40
vi. Long Creek Downstream Guilds/Trophic Levels III-G-40
vii. Muddy Creek Upstream Guilds/Trophic Levels III-G-40
viii. Muddy Creek Downstream Guilds/Trophic Levels III-G-40
ix. DCUT19 Upstream Guilds/Trophic Levels III-G-41
x. DCUT19 Downstream Guilds/Trophic Levels III-G-41
xi. Duck Creek Upstream Guilds/Trophic Levels III-G-41
xii. Duck Creek Downstream Guilds/Trophic Levels III-G-41
3.0 Summary and Conclusions III-G-42
IV. LITERATURE CITED IV-1
vii

SECTION I — INTRODUCTION
A. BACKGROUND
Figure I -Al
LIST OF FIGURES
Vicinity map of creeks monitored in the PCS creeks study
B. CREEKS MONITORED IN 2020
Figure I-B1
Figure I-B2
Figure I-B3
Figure I-B4
Figure I-B5
Figure I-B6
Figure I-B7
Figure I-B8
Figure I-B9
Figure I-B10
Figure I-B11
Figure I-B12
Figure I-B13
Figure I-B14
Figure I-B15
Figure I-B16
Figure I-B17
Figure I-B18
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
Data collection
locations in Broomfield Swamp Creek
location in SCUT1 (Control)
location in Jacks Creek
location in South Creek (Control)
locations in Little Creek (Control)
locations in Jacobs Creek
locations in PA2 (Control)
locations in Drinkwater Creek
locations in Long Creek (Control)
locations in Tooley Creek
locations in Muddy Creek
location in Pamlico River (Control)
locations in Huddles Cut
locations in Porter Creek
location in Durham Creek (Control)
locations in DCUT11
locations in DCUT19 (Control)
locations in Duck Creek (Control)
C. CUMULATIVE DRAINAGE BASIN REDUCTION
Figure I-C1
Figure I-C2
D. DROUGHT
No figures
Mine continuation through 2020
Drainage areas impacted by mine activities within monitored
creek study basins
Page
I-A-6
I-B-2
I-B-3
I-B-4
I-B-5
I-B-6
I-B-7
I-B-8
I-B-9
I-B-10
I-B-11
I-B-12
I-B-13
I-B-14
I-B-15
I-B-16
I-B-17
I-B-18
I-B-19
I-C-2
I-C-3
viii

Page
E. EXTREME EVENTS OR STORMS
No figures
F. RAINFALL
Figure I-F1 Rainfall summary across years of creek study: monthly totals I-F-2
at PCS Aurora Station 6 N and 30-year WETS rainfall
Figure I-F2
Annual rainfall for 2020 Aurora 6N as determined by the
USACE's Antecedent Precipitation Tool (APT) compared
to preceding 30 years
G. TAR RIVER DISCHARGE
Figure I-G1
Average daily Tar River discharge at Greenville, NC and daily
rainfall at PCS Aurora Station 6 N during the years of the creek
study
SECTION II -CORPS PERMIT SPECIAL CONDITION S -SIX QUESTIONS
Q1-FLOW
No Figures
Q2-CHARACTER
Figure II-B1 Dendrogram of hierarchical clusters of similarity of Jacks Creek
vegetation survey years based on the presence/absence of all
species
1-F-3
I-G-2
II-B-12
Figure II-B2 Percent of dominant species intolerant of brackish conditions II-B-12
every year surveyed in Jacks Creek with all transects combined
Figure II-B3 Percent of dominant species intolerant of brackish conditions II-B-13
in each transect for Jacks Creek pre- vs post -Mod Alt L years
Figure II-B4 Number of pre- vs post -Mod Alt L dominant herbs by individual II-B-13
transect in Jacks Creek
Figure II-B5 Number of pre- vs post -Mod Alt L dominant shrubs by individual II-B-14
transect in Jacks Creek
Figure II-B6 Dendrogram of hierarchical clusters of similarity of Jacobs II-B-14
Creek vegetation survey years based on presence/absence of
all species
ix

Figure II-B7
Dendrogram of hierarchical clusters of similarity of Drinkwater
Creek vegetation survey years based on presence/absence of
all species
Page
II-B-15
Figure II-B8 Percent of dominant species intolerant of brackish conditions II-B-15
at each transect for Tooley Creek pre- vs post -Mod Alt L.
Figure II-B9 Linear regression for percent of dominant brackish intolerant II-B-16
each year at TW4 in Tooley Creek.
Figure II-B10 Linear regression for percent of dominant brackish intolerant II-B-16
Species every year at TW1 in Tooley Creek.
Figure II-B11 Number of dominant species in the herb layer in Tooley Creek II-B-17
pre- vs post -Mod Alt L.
Figure II-B12 Number of dominant species in the herb layer in the main II-B-17
prong of Tooley Creek pre- vs post -Mod Alt L
Figure II-B13 Number of pre- vs post -Mod Alt L dominant shrubs by II-B-18
individual transect in Tooley Creek
Figure II-B14 Dendrogram of hierarchical clusters of similarity of Long II-B-18
Creek (control) vegetation survey years based on
presence/absence of all species
Figure II-B15 Dendrogram of hierarchical clusters of similarity of Porter Creek II-B-19
survey years based on presence/absence of all species
Figure II-B16 Dendrogram of hierarchical clusters of similarity of Duck Creek II-B-19
(control) years based on presence/absence of all species
Figure II-B17 Dendrogram of hierarchical clusters of similarity of DCUT11 II-B-20
survey years based on presence/absence of all species
Figure II-B18 Dendrogram of hierarchical clusters of similarity of DCUT19 II-B-20
(control) years based on presence/absence of all species
Figure II-B19 Percent of species in three categories of wetland status II-B-21
documented in vegetation survey years in four impact creeks
compared to control creek vegetation for the same survey
years as the four impact creeks
Figure II-B20
Longest combined pre- and post -Mod Alt L hydroperiod for II-B-23
well in Drinkwater Creek relative to location in the creek system
x

Page
Figure II-B21 Longest combined pre- and post -Mod Alt L hydroperiod for II-B-23
each well in Tooley Creek relative to location in the creek system
Figure II-B22 Longest combined pre- and post -Mod Alt L hydroperiod for II-B-24
well in the main prong of Huddles Cut relative to location in
the creek system
Figure II-B23 Longest combined pre- and post -Mod Alt L hydroperiod II-B-24
and mean rainfall for each period in Huddles Cut
Figure II-B24 Longest combined pre- and post -Mod Alt L hydroperiod for II-B-25
each well in DCUT11 relative to location in the creek system
Q3- FORAGE BASE
Figure II-C1
Figure II-C2
Dendrogram of hierarchical clusters of similarity for fish
community abundance and composition among all fish species
for all creeks and years sampled
II-C-16
Dendrogram of hierarchical clusters of similarity for fish guild II-C-17
data among all fish species for all creeks and years
Figure II-C3 Fish guilds of all creeks from 1999 to 2020 II-C-18
Figure II-C4 Dendrogram of hierarchical clusters of similarity for fish guild II-C-19
data among all trawls in Jacks Creek
Figure II-05 Dendrogram of hierarchical clusters of similarity for fish guild II-C-19
data among all trawls in Jacobs Creek
Figure II-C6 Dendrogram of hierarchical clusters of similarity for fish guild II-C-20
data among all trawls in Drinkwater Creek
Figure II-C7 Dendrogram of hierarchical clusters of similarity for fish guild II-C-20
data among all fyke nets in Huddles Cut
Figure II-C8 Dendrogram of hierarchical clusters of similarity for fish guild II-C-21
data among all fyke nets in DCUT11
Figure II-C9 Dendrogram of hierarchical clusters of similarity for fish guild II-C-21
data among all trawls in Little Creek
Figure II-C10 Dendrogram of hierarchical clusters of similarity for fish guild II-C-22
data among all trawls in Long Creek
Figure II-C11 Dendrogram of hierarchical clusters of similarity for fish guild II-C-22
data among all trawls in Muddy Creek
xi

Page
Figure II-C12 Dendrogram of hierarchical clusters of similarity for fish guild II-C-23
data among all trawls in Duck Creek
Figure II-C13 Dendrogram for macroinvertebrate taxa richness and abundance II-C-24
in upstream sweeps for all creek years
Figure II-C14 Dendrogram for macroinvertebrate taxa richness and abundance II-C-25
In downstream sweeps for all years
Figure II-C15 Dendrogram for macroinvertebrate taxa richness and abundance II-C-26
in upstream ponar grabs for all creek -years
Figure II-C16 Dendrogram for macroinvertebrate taxa richness and abundance II-C-27
downstream ponar grabs for all creek -years
Figure II-C17 a-f Six major components/axes generated from fuzzy II-C-28
correspondence analysis of trophic level and functional feeding
guild designations for every species found in ponar grabs in study
creeks across all years
Figure II-C18 Dendrogram for macroinvertebrate guilds assigned to upstream II-C-29
ponars for all creek years
Figure II-C19 Pre -/post -Mod Alt L upstream ponar benthic guilds II-C-30
FCA comparisons between Jacks Creek and Muddy Creek
and JacksCreek and Little Creek
Figure II-C20 Pre -/post -Mod Alt L upstream ponar benthic guilds FCA II-C-31
Comparisons between Porter Creek and Duck Creek and
Porter Creek and Little Creek
Figure II-C21 Dendrogram for macroinvertebrate guilds assigned to II-C-32
downstream ponars for all creek -years
Figure II-C22 Pre -/post -Mod Alt L upstream ponar benthic guilds FCA II-C-33
comparisons between Drinkwater Creek and PA2 and
Drinkwater Creek and Long Creek
Figure II-C23
Q4-MANAGED FISH
Figure II-D1
Pre -/post -Mod Alt L downstream ponar benthic guilds FCA
comparisons between Tooley Creek and Muddy Creek and
Tooley Creek and Long Creek
Dendrogram of hierarchical clusters of similarity for fish
community abundance and composition among managed fish
species for all creeks and years sampled
II-C-34
II-D-5
xii

Page
Q5-METALS
Figure II-E1 Average sediment metals for all impact creeks with both II-E-6
pre- and post -Mod Alt L data
Figure II-E2 a - d Average sediment metals for all control creeks combined II-E-7
across creeks and years with both pre- and post -Mod Alt L data
Figure II-E3 Sediment metal and TOC means combined into four categories: II-E-8
all years, all pre -Mod Alt L years, all post -Mod Alt L
years, and all control creek years
Figure II-E4a Combined pre -Mod Alt L water column metals concentrations II-E-9
compared to combined post -Mod Alt L values with all
detected values and any <LOQs as detected values
Figure II-E4b Combined pre -Mod Alt L water column metals concentrations II-E-9
compared to combined post -Mod Alt L value with only
detections at or above LOQ
Figure II-E5a Water column metal means for all years for all creeks by type II-E-10
Figure II-E5b
Water column metal means compared for all years by type II-E-10
without Fe shown
Q6- WATER QUALITY
Figure II-F1
Conceptual diagram to show temporal and spatial patterns II-F-3
among impact and control creeks
SECTION III — ADDITIONAL DISCUSSION OF SUMMARY RESULTS BY PARAMETER
A. SALINITY AND ENVIRONMENTAL VARIABLES
Figure III -Al
Tar River discharge from 1998 to 2020 III-A-14
Figure III-A2 Tar River discharge for all years of study and for each impact III-A-15
creek grouped by pre- and post -Mod Alt L
Figure III-A3 Total annual rainfall at four long-term rain gauges over the years III-A-16
of the PCS creeks study
Figure III-A4 Salinity boxplots for Broomfield Swamp Creek stations, III-A-17
Compared to SCUT1 stations on annual basis with both years
Representing Broomfield Swamp Creek pre -Mod Alt L years
Figure III-A5
Salinity box plots for Jacks Creek, South Creek, Little Creek,
and PA2 stations on annual basis with control creek data
arranged to match pre- and post -Mod L years
III-A-18

Figure III-A6
Salinity box plots for Jacobs Creek stations compared to
Long Creek, Little Creek, South Creek, and PA2 stations on
Annual basis with control creek data arranged to match pre -
post -Mod Alt L years
Page
III-A-19
Figure III-A7 Salinity box plots for Drinkwater Creek stations compared to III-A-20
Long Creek, South Creek, and PA2 stations on annual basis with
control creek data arranged to match pre- and post -Mod Alt L
years for Drinkwater Creek
Figure III-A8
Figure III-A9
Figure III-A10
Salinity boxplots for Tooley Creek stations compared to Long
Creek and South Creek stations on annual basis with control
creek data arranged to match pre- and post -Mod Alt L years
for Tooley Creek
Salinity boxplots for Huddles Cut stations compared to
Duck Creek stations on annual basis with control creek data
arranged to match pre- and post -Mod Alt L years for Huddles Cut
Salinity boxplots for Porter Creek stations and the DCUT11
station compared to Durham Creek stations and Duck Creek
stations on annual basis with control creek data arranged to match
pre- and post -Mod Alt L years for Porter Creek and DCUT11
III -A-21
III -A-22
III -A-23
Figure III -Al 1 Monthly salinities at non -control Aqua TROLLs: Jacks Creek, Ill-A-24
Jacobs Creek, and Drinkwater Creek
Figure III-Al2 Monthly salinities at non -control Aqua TROLLs: Tooley Creek III-A-25
Figure III-A13 Monthly salinities at non -control Aqua TROLLs: Huddles Cut, Ill-A-26
Porter Creek, and DCUT11
Figure III-A14 Monthly salinities at control Aqua TROLLs: Little Creek, South III-A-27
Creek, PA2, and Long Creek
Figure III -Al 5 Monthly salinities at control Aqua TROLLs: Duck Creek, Durham III-A-28
Creek, DCUT19, and Pamlico River
B. WETLAND HYDROLOGY
Figure III-B1 Longest hydroperiod for each well in Jacks Creek by year with III-B-8
total annual rainfall for each year
Figure III-B2 Longest hydroperiod for each well in Jacobs and Drinkwater III-B-8
creeks by year with total annual rainfall for each year
Figure III-B3 Longest hydroperiod for each well by year in Long Creek and III-B-9
total annual rainfall for each year
xiv

Page
Figure III-B4 Longest hydroperiod for each well by year in Tooley Creek III-B-9
and total annual rainfall for each year
Figure III-B5 Longest hydroperiod for each well in Huddles Cut main prong III-B-10
by year and total annual rainfall for each year
Figure III-B6 Longest hydroperiod for each well by year in Huddles Cut III-B-10
west prong and total annual rainfall for each year
Figure III-B7 Longest hydroperiod for each well in Porter Creek by year and III-B-11
total annual rainfall for each year
Figure III-B8 Longest hydroperiod for each well in DCUT11 by year and III-B-11
total annual rainfall for each year
Figure III-B9 Longest hydroperiod for each well in DCUT19 by year and III-B-12
total annual rainfall for each year
Figure III-B10 Longest hydroperiod for each well in Duck Creek by year and III-B-12
total annual rainfall for each year
Figure III-B11 Locations of deep wells and Level TROLLs in Porter Creek III-B-13
Figure III-B12 Hydrology of Level TROLLs in Porter Creek and times of deep III-B-12
well pump operation
C. WATER QUALITY
Figure III-C1 Principal Components Analysis biplot of interrelationships III-C-13
among all water quality variables
Figure III-C2 Intra-annual variability of Principal Component 1 and III-C-14
Principal Component 2 over time at Broomfield Swamp Creek
Station BSCWQ1
Figure III-C3 Intra-annual variability of Principal Component 1 and III-C-14
Principal Component 2 over time at Broomfield Swamp Creek
Station BSCWQ2
Figure III-C4 Intra-annual variability of Principal Component 1 and III-C-14
Principal Component 2 over time at Broomfield Swamp Creek
Station BSCWQ3
Figure III-05 Intra-annual variability of Principal Component 1 and III-C-15
Principal Component 2 over time at SCUT1 Station SC1WQ1
Figure III-C6 Intra-annual variability of Principal Component 1 and III-C-15
Principal Component 2 over time at SCUT1 Station SC1WQ2
xv

Page
Figure III-C7 Intra-annual variability of Principal Component 1 and III-C-15
Principal Component 2 over time at SCUT1 Station SC1WQ3
Figure III-C8 Interannual variability of Principal Component 1 and Principal III-C-16
Component 2 over time at Jacks Creek Station JWQ1
Figure III-C9 Interannual variability of Principal Component 1 and Principal III-C-16
Component 2 over time at Jacks Creek Station JWQ2
Figure III-C10 Interannual variability of Principal Component 1 and Principal III-C-17
Component 2 over time at Little Creek Station LCWQ1
Figure III-C11 Interannual variability of Principal Component 1 and Principal III-C-17
Component 2 over time at Little Creek Station LCWQ2
Figure III-C12 Interannual variability of Principal Component 1 and Principal III-C-18
Component 2 over time at Jacobs Creek Station JCBWQ1
Figure III-C13 Interannual variability of Principal Component 1 and Principal III-C-18
Component 2 over time at Jacobs Creek Station JCBWQ2
Figure III-C14 Interannual variability of Principal Component 1 and Principal III-C-19
Component 2 over time at PA2 Station PA2WQ1
Figure III-C15 Interannual variability of Principal Component 1 and Principal III-C-19
Component 2 over time at PA2 Station PA2WQ2
Figure III-C16 Interannual variability of Principal Component 1 and Principal III-C-20
Component 2 over time at Drinkwater Creek Station DWWQ1
Figure III-C17 Interannual variability of Principal Component 1 and Principal III-C-20
Component 2 over time at Drinkwater Creek Station DWWQ2
Figure III-C18 Interannual variability of Principal Component 1 and Principal III-C-21
Component 2 over time at Long Creek Station LOCWQ1
Figure III-C19 Interannual variability of Principal Component 1 and Principal III-C-21
Component 2 over time at Long Creek Station LOCWQ2
Figure III-C20 Interannual variability of Principal Component 1 and Principal III-C-22
Component 2 over time at Tooley Creek Station TWQ1
Figure III-C21 Interannual variability of Principal Component 1 and Principal III-C-22
Component 2 over time at Tooley Creek Station TWQ2
Figure III-C22 Interannual variability of Principal Component 1 and Principal III-C-22
Component 2 over time at Tooley Creek Station TWQ3
xvi

Page
Figure III-C23 Interannual variability of Principal Component 1 and Principal III-C-23
Component 2 over time at Huddles Cut Station HWQ1
Figure III-C24 Interannual variability of Principal Component 1 and Principal III-C-23
Component 2 over time at Huddles Cut Station HWQ2
Figure III-C25 Interannual variability of Principal Component 1 and Principal III-C-23
Component 2 over time at Huddles Cut Station HWQ3
Figure III-C26 Interannual variability of Principal Component 1 and Principal III-C-23
Component 2 over time at Huddles Cut Station HWQ4
Figure III-C27 Interannual variability of Principal Component 1 and Principal III-C-24
Component 2 over time at Porter Creek Station PCWQ1
Figure III-C28 Interannual variability of Principal Component 1 and Principal III-C-24
Component 2 over time at Porter Creek Station PCWQ2
Figure III-C29 Interannual variability of Principal Component 1 and Principal III-C-25
Component 2 over time at DCUT11 Station DC11 WQ2
Figure III-C30 Interannual variability of Principal Component 1 and Principal III-C-25
Component 2 over time at DCUT19 Station DC19WQ1
Figure III-C31 Interannual variability of Principal Component 1 and Principal III-C-26
Component 2 over time at Duck Creek Station DKCWQ1
Figure III-C32 Interannual variability of Principal Component 1 and Principal III-C-26
Component 2 over time at Duck Creek Station DKCWQ2
Figure III-C33 Agglomerative, hierarchical cluster analysis of annual means III-C-27
of each water quality parameter at each water quality station
Figure III-C34 Comparison of mean depth for each group of water quality III-C-28
stations identified by cluster analysis
Figure III-C35 Comparison of mean temperature for each group of water III-C-28
quality stations identified by cluster analysis
Figure III-C36 Comparison of mean salinity for each group of water quality III-C-29
stations identified by cluster analysis
Figure III-C37 Comparison of mean conductivity for each group of water III-C-29
quality stations identified by cluster analysis
Figure III-C38 Comparison of mean turbidity for each group of water quality III-C-30
stations identified by cluster analysis
xvi i

Page
Figure III-C39 Comparison of dissolved oxygen for each group of water III-C-30
quality stations identified by cluster analysis
Figure III-C40 Comparison of mean pH for each group of water quality III-C-31
stations identified by cluster analysis
Figure III-C41 Comparison of mean ammonium for each group of water III-C-31
quality stations identified by cluster analysis
Figure III-C42 Comparison of mean nitrate for each group of water quality III-C-32
stations identified by cluster analysis
Figure III-C43 Comparison of mean dissolved Kjeldahl nitrogen for each III-C-32
group of water quality stations identified by cluster analysis
Figure III-C44 Comparison of mean particulate nitrogen for each group of III-C-33
water quality stations identified by cluster analysis
Figure III-C45 Comparison of mean total dissolved nitrogen for each group III-C-33
of water quality stations identified by cluster analysis
Figure III-C46 Comparison of mean orthophosphate for each group of water III-C-34
quality stations identified by cluster analysis
Figure III-C47 Comparison of mean total dissolved phosphate for each III-C-34
group of water quality stations identified by cluster analysis
Figure III-C48 Comparison of mean particulate phosphate for each group of III-C-35
water quality stations identified by cluster analysis
Figure III-C49 Comparison of mean chlorophyll a for each group of water III-C-35
quality stations identified by cluster analysis
Figure III-050 Comparison of mean total dissolved organic carbon for each III-C-36
group of water quality stations identified by cluster analysis
D. METALS
Figure III-D1 Total organic carbon values in each study creek each year III-D-4
since 2013
Figure III-D2 Reported sediment metals for Jacks Creek pre- and post -Mod III-D-5
Alt L through 2020
Figure III-D3 Reported sediment metals for Jacobs Creek pre- and post -Mod III-D-6
Alt L through 2020
Figure III-D4 Reported sediment metals for Drinkwater Creek pre- and III-D-7
post -Mod Alt L through 2020
xvi i i

Figure III-D5 Reported sediment metals for Tooley Creek pre- and post -Mod III-D-8
Alt L
Figure III-D6 Reported sediment metals for Huddles Cut pre- and post -Mod III-D-9
Alt L
Figure III-D7 Reported sediment metals for Porter Creek pre- and post -Mod III-D-10
Alt L
Figure III-D8 Reported sediment metals for DCUT11 pre- and post -Mod III-D-11
Alt L
Figure III-D9 a—d Average water column metals for creeks with both pre- and III-D-12
post -Mod Alt L data combined across creeks and years and
all control creeks combined across years and creeks
E. VEGETATION
Figure III-E1 Percent of dominant species intolerant of brackish conditions III-E-9
at Jacks Creek transects arranged by distance from mouth of
creek for pre- and post -Mod Alt L years
Figure III-E2 Percent of dominant brackish intolerant species for Jack Creek III-E-10
transects by year and by pre- and post -Mod Alt L years combined
Figure III-E3 Percent of dominant species intolerant of brackish conditions III-E-11
at Tooley Creek transects arranged by distance from
mouth of creek for pre- and post -Mod Alt L years
Figure III-E4
F. FISH
Percent of dominant speciesintolerant of brackish III-E-11
conditions for Tooley Creek transects by year
Figure III-F1 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all trawls
in Jacks Creek
Figure III-F2 Catch -per -unit -effort for commonly captured fish species in
Jacks Creek with statistically significant differences between
pre -Mod Alt L and post -Mod Alt L years
Figure III-F3 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all trawls
in Jacobs Creek
Figure III-F4 Catch -per -unit -effort for commonly captured fish species in
Jacobs Creek with statistically significant differences between
pre -Mod Alt L and post -Mod Alt L years
III-F-19
III-F-20
III-F-21
III-F-22
xix

Figure III-F5 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all trawls
in Drinkwater Creek
Figure III-F6 Catch -per -unit -effort for commonly captured fish species
in Drinkwater Creek with statistically significant differences
between pre -Mod Alt L and post -Mod Alt L years
Figure III-F7 Dendrogram of hierarchical clusters of similarity for annual fish
community abundance and composition among all trawls in
Tooley Creek
Figure III-F8 Catch -per -unit -effort for commonly captured fish species at
Tooley Creek with statistically significant differences
between pre -Mod Alt L and post -Mod Alt L years
Figure III-F9 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all fyke
nets in Huddles Cut
Figure III-F10 Catch -per -unit -effort for commonly captured fish species in
Huddles Cut with statistically significant differences between
pre -Mod Alt L and post -Mod Alt L years
Figure III-F11 Catch -per -unit -effort for commonly captured fish species in
Porter Creek with statistically significant differences between
pre -Mod Alt L and post -Mod Alt L years
Figure III-F12 Catch -per -unit -effort for commonly captured fish species in
DCUT11 with statistically significant differences between
pre -Mod Alt L and post -Mod Alt L years
Figure III-F13 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all trawls
in Little Creek
Figure III-F14 Dendrogram of hierarchical clusters of similarity for annual
fish community abundance and composition among all trawls
in Muddy Creek
Figure III-F15 Dendrogram of hierarchical clusters of similarity for annual fish
community abundance and composition among all trawls
in Duck Creek
G. BENTHOS
III-F-23
III-F-24
III-F-25
III-F-26
III-F-27
III-F-28
III-F-29
III-F-30
III-F-31
III-F-32
III-F-33
Figure III-G1 a-d Dendrograms of clusters based on taxa richness and III-G-44
abundance for all years in Jacks Creek
Figure III-G2 Dendrograms of clusters based on taxa richness and III-G-45
abundance for all years in Jacobs Creek
xx

Page
Figure III-G3 a-c Dendrogram of clusters based on taxa richness and III-G-46
abundance for all years in Drinkwater Creek
Figure III-G4 a-d Dendrograms of clusters based on taxa richness and III-G-47
abundance for all years in Tooley Creek
Figure III-G5 a-d Dendrograms of clusters based on taxa richness and III-G-48
abundance for all years in Huddles Cut
Figure III-G6 a-c Dendrograms of clusters based on taxa richness and III-G-49
abundance for all years of in Porter Creek
Figure III-G7 a-b Dendrograms of clusters based on benthic taxa richness and III-G-50
abundance for all years in DCUT11
Figure III-G8 a-d Dendrograms of clusters based on taxa richness and III-G-51
abundance for all years in Little Creek
Figure III-G9 a-c Dendrograms of clusters based on taxa richness and III-G-52
abundance for all years in PA2
Figure III-G10 a-b Dendrograms of clusters based on benthic taxa richness and III-G-53
abundance for all years in Long Creek
Figure III-G11 a-d Dendrogram of clusters based on benthic taxa richness and III-G-54
abundance for all years in Muddy Creek
Figure III-G12 a-c Dendrogram of clusters based on benthic taxa richness and III-G-55
abundance for all years in Duck Creek
Figure III-G13 a—c Dendrograms of clusters of FCA scores and temporal III-G-56
depiction of those scores weighted by relative abundance of each
species in Jacks Creek
Figure III-G14 a-c Dendrograms of clusters of FCA scores and temporal
depiction of those scores weighted by relative abundance of each
species in Jacobs Creek
Figure III-G15 Pre- and post -Mod Alt L boxplots of six axes of FCA scores for
Jacobs Creek years compared to same years as PA2 and
Long creek
Figure III-G16 a-c Dendrograms of clusters of FCA scores and temporal
depiction of those scores weighted by relative abundance of each
species in Drinkwater Creek
Figure III-G17 Pre- and post -Mod Alt L boxplots of six axes of FCA scores for
Drinkwater Creek years compared to same years in Long Creek
and PA2
III-G-57
III-G-58
III-G-59
III-G-60
xxi

Figure III-G18 a-c
Dendrogram of Tooley Creek clusters of FCA scores,
temporal depiction of those scores weighted by relative
abundance of each species, and pre- and post -Mod Alt L
comparisons to control creeks
Page
III-G-61
Figure III-G19 Pre- and post -Mod Alt L boxplots of six axes of FCA scores for III-G-62
Tooley Creek years compared to same years in Muddy and
Long creeks and PA2
Figure III-G20 a-c Dendrograms of clusters of FCA scores and temporal III-G-63
depiction of those scores weighted by relative abundance of each
species in Huddles Cut
Figure III-G21 Pre- and post -Mod Alt L boxplots of the six axes of FCA scores III-G-64
for Huddles Cut years compared to same years in Muddy Creek
Figure III-G22 a-c Six axes of FCA scores, pre- and post -Mod Alt L comparisons III-G-65
to control creeks, and dendrogram of clusters of FCA scores in
Porter Creek
Figure III-G23 Pre- and post -Mod Alt L boxplots of the six axes of FCA scores III-G-66
for Porter Creek years compared to same years in Duck Creek
and Little Creek
Figure III-G24 a-c Dendrogram of clusters of FCA scores and temporal depiction III-G-67
of those scores weighted by relative abundance of each species
in DCUT11
Figure III-G25 Pre- and post -Mod Alt L boxplots of the six axes of FCA III-G-68
scores for DCUT11 years compared to same years in DCUT19
and Duck Creek
Figure III-G26 a—c Dendrogram of clusters of FCA scores and temporal depiction III-G-69
of those scores weighted by relative abundance of each species
in Little Creek
Figure III-G27 a—c Six axes of FCA scores and dendrogram of clusters of FCA III-G-70
scores in PA2
Figure III-G28 a—b Dendrogram of clusters of FCA scores and temporal III-G-71
depiction of those scores weighted by relative abundance of
each species in Long Creek
Figure III-G29 a—c
Dendrograms of clusters of FCA scores and temporal depiction
those scores weighted by relative abundance of each species in
Muddy Creek
III-G-72

Figure III-G30 a—c
Figure III-G31 a-b
Dendrogram of clusters of FCA scores and temporal depiction
of those scores weighted by relative abundance of each species in
DCUT19
Page
III-G-73
Dendrograms of clusters of FCA scores and temporal depiction III-G-74
of those scores weighted by relative abundance of each species in
Duck Creek

SECTION I
A. BACKGROUND
Table I -Al
Table I-A2
LIST OF TABLES
Page
Pre- and post -Mod Alt L data collection by parameter and by creek I-A-7
per the 2011 plan of study
Monitored parameters, equipment, and frequency of data collection I-A-12
B. CREEKS MONITORED IN 2020
No tables
C. Cumulative and 2020 Mining, Mine -related Activities, and Drainage Basins
Table I-C1 Estimated historic and current drainage basin of each control and impact 1-C-4
Creek in the study as described in CZR 2011 and CZR 2017
D. DROUGHT
Table I-D1
Drought conditions for the years 2000-2005 and 2007-2020
E. EXTREME EVENTS OR STORMS
Table I -El
F. RAINFALL
Table I-F1
Table I-F2
Extreme events or storms for the years 1998-2005 and 2007-2020
-D-2
-E-2
Monthly and annual rainfall totals across the years 1998-2005 and I-F-4
2007-2020 for WETS Station Aurora 6N
Annual rainfall totals, maximums, minimums, and averages collected at I-F-5
rain gauges in study creeks and from WETS Station Aurora 6N
SECTION II- CORPS PERMIT SPECIAL CONDITION S - SIX QUESTIONS
Q1-FLOW
Table II -Al
Table II-A2
Observed flow events conducted in conjuction with hydrology and
salinity monitoring 2012- 2020
Number of days in a year flow was inferred based on obsevations
Q2-CHARACTER
Table I I-B1 a
Table I I-B1 b
Percent of the dominant non -wetland and brackish intolerant plant
species in vegetation trainsects in seven impact creeks by year
Percent of dominant non -wetland and brackish intolerant plant
species in vegetation transects in four control creeks by year
I I-A-9
I I -A-10
II-B-26
II-B-28
xxiv

Table II-B2
Table II-B3
Page
Total numbers and percentages of total species assigned a National II-B-29
Wetlands Plant List wetland rating category at each creek on annual basis
for each creek surveyed through 2020
Summary of pre- to post -Mod Alt L differences in parameters
used to discuss changes in vegetation character for each impact
creek as of 2020 collection year.
II-B-32
Q3-FORAGE BASE Page
Table II-C1
Table II-C2
Table II-C3
Table II-C4
Table II-05
Average catch -per -unit -effort for the most abundant fish species
captured across 12 clusters identified by cluster analysis performed
for all PCS fish collections
Guild designations of all fish caught in trawl nets or fyke nets
Summary of trawl and fyke net shrimp and blue crab catch frequency
and score data from 2011 through 2020
Trophic level and functional feeding guild designations for benthic
species identified in the ponar grabs of the PCS creeks study
II-C-35
II-C-36
II-C-38
II-C-39
Calculated averages of three different benthic parameters for pre- II-C-43
and post-Modl Alt L years for each creek
Q4-MANAGED FISH
Table II-D1
Q5-METALS
Table II-E1
Table II-E2
Catch -per -unit -effort average for managed fish species caught
across seven groups identified by cluster analysis in study collection
years through 2020
II-D-6
Average Sediment metal concentration of pre- and post- Mod Alt L II-E-11
years and results of t-test between pre- and post -Mod Alt L years
Means and standard deviations by year for six sediment metals
for which Effects Range Low and Effects Range Medium have
been determined
II-E-12
Table II-E3 Percent of samples for each creek where metals were not detected II-E-13
the sediment or the water column
Q6-WATER QUALITY
Table II-F1
Percent differences in water quality parameters between seven
study creeks impacted by Mod Alt L and five creeks unimpacted
by Mod Alt L
I I-F-4
xxv

SECTION III ADDITIONAL DISCUSSION OF SUMMARY RESULTS BY PARAMETER
A.SALINITY AND ENVIRONMENTAL VARIABLES Page
Table III -Al Monthly means, maximum, minimum and yearly salinity in 2020 at III-A-29
Aqua TROLL stations in the study
Table III-A2 Correlations between 2020 salinity and several climatic variables: Tar III-A-33
River discharge, water depth, rainfall, and wind direction
B. WETLAND HYDROLOGY
Table III-B1 Wetland hydroperiods during the 2020 growing season at Level III-B-15
TROLLs in 12 study creeks
Table III-B2 Operation dates for the pumps within deep water wells in proximity III-B-17
to the Level TROLLs in Porter Creek
Table III-B3 Details of the final models for Level TROLLs in Porter Creek III-B-18
C. WATER QUALITY
Table III-C1 Water quality data record for all years for all study creeks III-C-37
Table III-C2 Loading for each water quality variable on each principal component III-C-38
Table III-C3 Average of water quality parameters across the five groups identified III-C-38
by the cluster analysis
Table III-C4 Comparison of pre- and post -Mod Alt L conditions for Jacks Creek III-C-39
Table III-05 Comparison of pre- and post -Mod Alt L conditions for Jacobs Creek III-C-39
Table III-C6 Comparison of pre- and post -Mod Alt L conditions for Drinkwater III-C-40
Creek
Table III-C7 Comparison of pre- and post -Mod Alt-L conditions for Tooley Creek III-C-40
Table III-C8 Comparison of pre- and post -Mod Alt-L conditions for Huddles Cut III-C-41
Table III-C9 Comparison of pre- and post -Mod Alt L conditions for Porter Creek III-C-41
Table III-C10 Comparison of pre- and post -Mod Alt L conditions for DCUT11 III-C-42
D. METALS
Table III-D1 Sediment metal concentrations by year for each monitored creek III-D-13
Table III-D2 Water column metals concentrations by year for each monitored creek III-D-15
xxvi

Page
E. VEGETATION
Table III-E1a Relative importance values of dominant herbaceous species III-E-12
surveyed in vegetation transects in seven impact creeks through 2020
Table III -El b Relative importance values of dominant herbaceous species in III-E-20
vegetation transects in four control creeks from 2011 — 2020
Table III-E2a Relative importance values for dominant shrub and woody vine III-E-21
species surveyed in vegetation transects in seven impact creeks
through 2020
Table III-E2b Relative importance values by year for dominant shrub and woody vine III-E-26
species in four control creeks through 2020
Table III-E3
F. FISH
Table III-F1
Table III-F2
Cumulative list of dominant species at monitored creeks since 1998,
their tolerance to brackish conditions, and wetland indicator status
through 2020
III-E-27
Comparison of fish community structure by year for each study creek III-F-34
Catch -per -unit -effort average by species for fish caught in Broomfield III-F-35
Swamp Creek
Table III-F3 Catch -per -unit -effort average by species for fish caught in Jacks Creek III-F-36
Table III-F4 Catch -per -unit -effort average by species for fish caught in Jacobs Creek III-F-38
Table III-F5 Catch -per -unit -effort average by species for fish caught in Drinkwater III-F-39
Creek
Table III-F6 Catch -per -unit -effort average by species for fish caught in Tooley Creek III-F-40
Table III-F7 Catch -per -unit -effort average by species for fish caught in Huddles Cut III-F-42
Table III-F8 Catch -per -unit -effort average by species for fish caught in Porter III-F-44
Creek
Table III-F9 Catch -per -unit -effort average by species for fish caught in DCUT11 III-F-45
Table III-F10 Catch -per -unit -effort average by species for fish caught in SCUT1 III-F-46
Table III-F11 Catch -per -unit -effort average by species for fish caught in Little Creek III-F-47
Table III-F12 Catch -per -unit -effort average by species for fish caught in PA2 III-F-48
Table III-F13 Catch -per -unit -effort average by species for fish caught in Long Creek III-F-49
Table III-F14 Catch -per -unit -effort average by species for fish caught in Muddy Creek III-F-50
xxvii

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Table III-F15 Catch -per -unit -effort average by species for fish caught in DCUT19 III-F-51
Table III-F16 Catch -per -unit -effort average by species for fish caught in Duck Creek III-F-52
G. BENTHOS
Table III-G1 Cumulative list of benthic macroinvertebrate taxa and assigned III-G-75
sensitivity values of species collected in study creeks in May 1998
through 2005 and 2007 through 2020
Table III-G2 Abundant benthic macroinvertebrate species for sweep samples
collected in monitored creeks during May of Mod Alt L sample years
1998-2005 and 2007-2020
Table III-G3 Benthic macroinvertebrate community structure data for sweep
samples collected in monitored creeks during May of Mod Alt L sample
years 1998-2005 and 2007-2020
Table III-G4 Abundant benthic macroinvertebrate species for ponar grab samples
collected in monitored creeks during May of Mod Alt L sample years
1998-2005 and 2007-2020
Table III-G5 Benthic macroinvertebrate community structure data for ponar grab
samples collected in monitored creeks during May of Mod Alt L
sample years 1998-2005 and 2007-2020
Table III-G6 Highest Shannon -Weiner diversity score and highest EBI score by
creek per year, highest Shannon -Weiner diversity score and highest
EBI score for each year among all creeks, and summary of ranges and
averages by creek
III-G-77
III-G-85
III-G-89
III-G-97
III-G-102
xxvi i i

LIST OF APPENDICES
Appendix A History and Methods by Parameter
Appendix B Flow Observations 2020 (CD/DVD only)
Appendix C Salinity Graphs 2020 (CD/DVD only)
Appendix D Hydrology Graphs, Tables, and Water Level Trends 2020 (CD/DVD only)
Appendix E Water Quality 2020 (CD/DVD only)
Appendix F Metals 2020 (CD/DVD only)
Appendix G Vegetation 2020 - data and transect photos (CD/DVD only)
Appendix H Fish 2020 (CD/DVD only)
Appendix I Benthos 2020 (CD/DVD only)
LIST OF SUPPLEMENTS
Supplement 1 Amended 2011 Creeks Study Plan Appendix F Water Quality Methods