20080868 Ver 2_Section I A Background 2021 PCS Creeks Report_20220605

I. INTRODUCTION
A. Background
In November 2000, PCS Phosphate Company, Inc. (PCS) applied for authorization to
continue its phosphate mining operations on the Hickory Point peninsula (NCPC Tract) adjacent
to the Pamlico River and South Creek once phosphate reserves were depleted under the 1997
permitted area for Alt E. In 2001, the environmental impact statement (EIS) process was begun
for mine continuation. The Corps established that it would be appropriate to consider holistic
mine plans that included more than one tract; PCS then proposed alternatives in two additional
tracts (Bonnerton and South of Route 33 [S33]). In January 2009, the NC Division of Water
Quality (now Division of Water Resources-NCDWR) issued PCS a 401 Water Quality Certification
(#2008-0868 version 2.0; Certification No. 3771) and in June of 2009, the Corps issued PCS a
404 permit (Action ID 200110096) for activities associated with Modified Alternative L (Mod Alt L)
which would occur over 35 years in the three tracts (Figure I-A1).
As the Mod Alt L mine advance continues temporary drainage basin reductions for several
small estuarine tributaries of South Creek and the Pamlico River, the 2009 USACE permit and
the North Carolina Division of Water Quality Certification contained conditions that required the
continuation of creeks monitoring required under the previous 1997 permit. To detect any
deleterious effects on these tributaries from the Mod Alt L advance, development of a new creeks
plan of study, expanded to include more creeks (from three to 13) and more parameters, and
formation of an advisory Science Panel were also required. The new creeks plan of study was
first approved in February 2011. After the first science panel meeting (2012) and discussion of
the first annual report produced under the new plan of study (2011 year), additional revisions and
clarifications were incorporated into the creeks plan of study which was finalized in September
2012. Table I -Al shows the monitoring by parameter for each creek and Table I-A2 shows the
monitoring parameters, equipment type or field methods, and monitoring frequency.
In April of 2012, the Corps approved a request made by PCS for a one-time modification
to Special Condition V of the 2009 permit/ROD to change the due date of the annual report from
1 May to 1 June 2012. In March of 2013, the Corps approved a request made by PCS to modify
Special Conditions V and W of the 2009 permit/ROD: Special Condition V was modified to allow
the annual creeks monitoring reports to be completed by 1 July (instead of 1 May) of the following
year and Special Condition W was modified to allow the Science Panel to meet no later than 30
August of the following year (instead of 30 July). Recipients of the PCS Creeks Monitoring Plan
of Study were provided addendum pages to document these modifications.
In 2013, pre -Mod Alt L monitoring began in DCUT11 and its control creek, DCUT19, both
of which are tributaries to Durham Creek. A new salinity monitor was also added near the
downstream end of Durham Creek. With the addition of Durham Creek watershed monitoring
sites in 2013 the entire suite of locations and parameters north of NC33 were operational as
specified in the final creeks monitoring plan of study (16 monitoring locations, of which 13 are
creeks monitored for multiple parameters (six control creeks and seven impact creeks), and three
locations serve as additional control locations for water depth and salinity only).
Over the years of the PCS creeks study, rules for state -certified laboratories, laboratory
method and/or laboratory equipment, or field equipment have changed. Occasionally, laboratory
and/or field methods or equipment calibrations are refined, or changed to reflect either better
practices, or new equipment, or both.
I -A-1

The plan to address Water Quality Certification Condition 13 and 404 Permit Condition S requires
monitoring of one of the South Creek tributary creeks in the South of Hwy 33 (S33) mining tract.
Broomfield Swamp Creek was selected as the monitored impact creek and a nearby unnamed
tributary to South Creek (SCUT1) as control. Mine progress into the Broomfield Swamp Creek
drainage area was originally projected to occur in the 2022-2023 timeframe. To confidently
acquire at least five years of pre -data, 2018 was the target year to begin; however, timing of final
plan approval and completion of the monitoring pier construction did not allow all data to be
collected for the entire year for each parameter. Supplement 2 of the 2018 report contained the
final monitoring plan for Broomfield Swamp Creek and raw data collected in 2018 (wetland
hydrology, fish and benthos, YSI hand-held water quality measurements taken during
fish/benthos collections, and ECU water quality samples from the most downstream proposed
pier location in Broomfield Swamp Creek and in SCUT1). Since not all parameters were collected
for the entire year, no analysis on the 2018 raw data was done; however, ECU laboratory results
for the samples that were collected were also included. The first pre -Mod Alt L year for creeks
south of Hwy 33 with complete data and comparative or statistical analyses was 2019.
1.0 Drainage Basin Acreage Adjustments
Progress of the mine across a watershed is determined on an annual acreage
basis. As evident in Table I -Al , some monitoring parameters are collected once a year only and
others are collected throughout the year. Data collection for a parameter in a specific watershed
may occur prior to the mine progress through that watershed for that year or, in the case of
parameters collected throughout the year, mine progress through the watershed may have
affected only the data collected in the last portion of the calendar year. The NCDWQ (now
NCDWR) agreed during the previous PCS creeks study that "significant measurable results" were
not likely to be determined "until 10 percent or more of the basin was impacted." The 10 percent
threshold was developed specifically for Alt E impacts in Tooley Creek yet remains an important
factor in the determination of the first post -Mod Alt L year in a given creek.
To determine the percentage of basin impact and to increase accuracy of
analyses, drainage basin quantification is recalculated annually at the end of each mine advance
year. Over the course of the creeks study, basin acreage calculations have been refined as past
basin alteration activities were uncovered and digital tools improved (e.g., LiDAR). In calculation
of the percent impacts to assign 2013 as pre- or post -Mod Alt L for a given creek (10 percent
reduction threshold on current basin), it was discovered that the drainage basins of the NCPC
creeks had actually been reduced prior to Alt E by the construction of a canal inside the Alt E
boundary dug in the late 1970s or early 1980s. This canal cut off the NCPC creeks from portions
of their historic drainage basin and resulted in several corrections. It reduced the historic basin
acreage, the Alt E baseline acreage, and the basin remaining after Alt E for each NCPC creek
shown in previous annual reports. These reductions affected the pre -Alt E and pre -Mod Alt L
basins and subsequent percent reductions shown for some creeks in previous annual reports.
This correction prompted PCS and CZR to re -consult the ROD and Science Panel
meeting notes for additional guidance on what is most appropriate to use as the "current" basin
for calculation of Mod Alt L percent reduction. For the new creeks added under the expanded
creeks plan of study, the "current" basin represents conditions prior to Mod Alt L and after Alt E
impacts; thus some years for creeks with longer data sets (Jacks Creek, Tooley Creek, Muddy
Creek, and Huddles Cut) were not included in the 2013 report evaluation of Mod Alt L. Previously,
construction of the perimeter canal has always been used as the first "impact" to a creek.
However, at the 2013 Science Panel meeting (2012 report), it was recognized that in some creeks,
prior to construction of the perimeter canal, there may be other mine development activities in a
basin which interrupt the surface flow of storm water downstream. These other activities may
include construction of perimeter berms or roads or an internal storm water ditch. It was also
I -A-2

agreed that there would be no effort to identify these activities retroactively; such activities would
be identified and used to determine first onset of impacts only from 2013 forward.
2.0 Pre- and Post -Mod Alt L Year Data Set Revisions
As indicated above, some mine -related impacts may have occurred in previous
years, but basin reductions must exceed 10 percent of a creek basin before a year is included in
the post -impact data set for all parameters. However, in 2011, the Science Panel recognized that
of all the parameters, vegetation is the most likely to have a delayed response to mine impacts
and that vegetation would not be surveyed as the mine moved through a basin (transition year[s])
nor the first year after the mine had progressed beyond the basin (post -transition year).
Therefore, the years of post -Mod Alt L vegetation in a creek do not always match the post -Mod
Alt L years for other parameters in the same creek.
At the August 2014 Science Panel meeting (2013 report), there was discussion
about the pre- and post -Mod Alt L arrangement of years used for 2013 report analysis (post- Alt
E years were considered baseline or "current condition" or pre -Mod Alt L, i.e., a creek was
presumed stabilized post -Alt E and pre -Alt E data were excluded). It was decided that the Corps,
NCDWR, PCS, and CZR should meet to determine the most sensible arrangement of data within
the regulatory framework of the Section 404 permit/ROD and the NCDWR water quality
certification (monitor effects from mine continuation under the permitted Mod Alt L boundary) and
the scientific framework (more data are considered better even if not perfect). This meeting
occurred 15 January 2015 at the Corps' Washington NC regional office and also included Dr.
Dave Kimmel from East Carolina University.
The natural variability within and between these tributaries, acknowledgment of
transition years in response to impacts, the difficulty of interpretation of data in dynamic systems,
and the imperfection of the data (virtually no creek has been unaffected by prior mine or other
human activities), were important factors considered during the January 2015 meeting. Since
inclusion of all data increases the statistical power and is likely beneficial to the overall question
about stability of creek functions, despite data imperfections, it was determined at the January
2015 meeting that all data years for each creek would be included in all future analysis and data
collected prior to Mod Alt L impacts will be considered pre -Mod Alt L. For some creeks, this
combines data from the years before impacts from Alt E, the years during impacts of Alt E, and
the years post -Alt E (potential years of "stabilization" to a reduced basin condition) as pre -Mod Alt
L data. In Huddles Cut, pre -Mod Alt L years include pre -Alt E years and during -Alt E years but
would lack any post -Alt E years because Alt E impacts stopped and Mod Alt L impacts began in
the same year (2010).
The final creeks study plan (CZR 2011; revised September 2012) indicated
vegetation data did not need to be collected every year and agencies had already agreed that
vegetation did not need to be sampled during the year(s) of impact to the drainage basin or the
first transition year post -impact (CZR 2014). At the August 2017 Science Panel meeting (2016
data report review) further clarifications were discussed about the interval between post -Mod Alt
L vegetation surveys. It was agreed that as originally planned, five years of pre -Mod Alt L
vegetation data would be collected when possible, that four years of post -Mod Alt L data would
be collected after the transition year(s), and that after four years of post -Mod Alt L vegetation data
collection the fifth year would be skipped. In a certified letter sent to USACE and NCDWR on 12
September 2017, PCS made further clarifications on the frequency and proposed that after the
fifth year post -Mod Alt L (the first skipped year), that vegetation be surveyed every other year until
such time that the agencies or Science Panel members deem otherwise. At the 2018 Science
Panel meeting (2017 data report review), the agencies agreed to the interval described in the
PCS September 2017 letter. A copy of the August 2018 USACE letter of approval for the clarified
I-A-3

vegetation monitoring interval was included in Supplement 1 of the 2018 report (CZR 2019).
At the August 2020 Science Panel meeting, to discuss the 2019 data collection
report, a need to change the equipment at two Huddles Cut data collection locations was
presented; it was proposed to replace the Aqua TROLLs at HS1 and HS2 in Huddles Cut with
Level TROLLs for depth (measurements every 1.5 hour) and handheld YSI meters for twice a
month salinity measurement at the HS1 and HS2 locations. The members of the Science Panel
endorsed the proposition and agency representatives requested a formal request be made for
this equipment change; PCS sent a formal request to agencies in a letter dated 12 November
2020. Approval was received from the USACE in January 2021 for adjustment of the sampling
methodology. From 2021 forward, water level data from the Level TROLLS at HS1 and HS2 will
be downloaded once a month and salinity will be measured by handheld YSI meter twice a month.
Salinity and depth at HS3 will continue to be monitored by an Aqua TROLL as before.
A summary of data collected at impact creeks through 2021; the years below are
used for pre -Mod Alt L and post -Mod Alt L evaluations.
• Broomfield Swamp Creek:
Flow: Not Applicable
Benthic: Pre- (2019-2021)
Fish: Pre- (2019-2021)
Metals: Pre- (2019-2021)
Water Quality: Pre- (2019-2021)
Salinity: Pre- (2019-2021)
Hydrology: Pre- (2019-2021)
Vegetation: Pre- (2019-2021)
• Jacks Creek:
Flow (Observation): Pre- (2012-2014); Post- (2015-2021)
Benthic: Pre- (1998-2005, 2011-2014); Post- (2015-2021)
Fish: Pre- (1998-2005, 2011-2014); Post- (2015-2021)
Metals: Pre- (1998, 2000-2005, 2011-2014) Post- (2015-2021)
Water Quality: Pre- (1999-2005, 2011-2014); Post- (2015-2021)
• 1999- Data collection started in May 5
• 2002- No data collection from May 15 thru August
• 2011- Data collection started in November 9
Salinity: Pre- (1999-2005, 2011-2014); Post- (2015-2021)
• 1999- Data collection started May 5
• 2011- Data collection started July 20
Hydrology: Pre- (2000-2005, 2011-2014); Post- (2015-2021)
Vegetation: Pre- (1998-2005, 2011-2014); Post- (2017-2020);
Transition Years (2015-2016); Skip Year (2021)
I -A-4

• Jacobs Creek:
Flow (Observation): Pre- (2012-2013); Post- (2014-2021)
Benthic: Pre- (2011-2013); Post- (2014-2021)
Fish: Pre- (2011-2013); Post- (2014-2021)
Metals: Pre- (2011-2013); Post- (2014-2021)
Water Quality: Pre- (2011-2013); Post- (2014-2021)
• 2011- Data collection started October 26
Salinity: Pre- (2011-2013); Post- (2014-2021)
• 2011- Data collection started July 26
Hydrology: Pre- (2011-2013); Post- (2014-2021)
Vegetation: Pre- (2011-2013); Post- (2017-2020); Transition Years
(2014-2016)
• Drinkwater Creek:
Flow (Observation): Pre- (2012); Post- (2013-2021)
Benthic: Pre- (2011-2012); Post- (2013-2021)
Fish: Pre- (2011-2012); Post- (2013-2021)
Metals: Pre- (2011-2012); Post- (2013-2021)
Water Quality: Pre- (2011-2012); Post- (2013-2021)
• 2011- Data collection started September 24
Salinity: Pre- (2011-2012); Post- (2013-2021)
• 2011- Data collection started in July 1
Hydrology: Pre- (2011-2012); Post- (2013-2021)
Vegetation: Pre- (2011); Post- (2016-2019, 2021); Transition Years
(2012-2015); Skip Year (2020)
• Tooley Creek:
Flow (Observation): Pre- (no years); Post- (2012-2021)
Benthic: Pre- (1998-2001, 2010-2011); Post- (2012-2021)
Fish: Pre- (1998-2001, 2010-2011); Post- (2012-2021)
Metals: Pre- (1998, 2000-2001, 2010-2011); Post- (2012-2021)
Water Quality: Pre- (1999-2002, 2010-2011); Post- (2012-2021)
• 1999- Data collection started May 5
• 2002- No data collection from July 8 thru December 23
Salinity: Pre- (1999-2002, 2010-2011); Post- (2012-2021)
• 1999- Data collection started May 5
• 2002- No data collection from June 12 thru December 31
Hydrology: Pre- (2000-2001, 2010-2011); Post- (2012-2021)
Vegetation: Pre- (1998-2001, 2010-2011); Post- (2015-2018, 2020);
Transition Years (2012-2014); Skip Years (2019, 2021)

• Huddles Cut:
Flow (Observation): Pre- (no years); Post- (2021)
Benthic: Pre- (1998-2001, 2007-2009); Post- (2010-2021)
Fish: Pre- (1998-2001, 2007-2009); Post- (2010-2021)
Metals: Pre- (1998, 2000-2001, 2007-2009); Post- (2010-2021)
Water Quality: Pre- (1999-2002, 2007-2009); Post- (2010-2021)
• 1999- Data collection started May 5
• 2002- No data collection from May 29 thru December 31
Salinity: Pre- (1999-2002, 2007-2009); Post- (2010-2021)
• 1999- Data collection started May 5
• 2002- No data collection from May 29 thru December 31
Hydrology: Pre- (2000-2001, 2007-2009); Post- (2010-2021)
Vegetation: Pre- (1998-2001, 2007-2009); Post- (2013-2014, 2016-
2019, 2021); Transition Years (2010-2012); Skip Year
(2020)
• Porter Creek:
Flow (Observation): Pre- (2012-2015); Post- (2016-2021)
Benthic: Pre- (2011-2015); Post- (2016-2021)
Fish: Pre- (2011-2015); Post- (2016-2021)
Metals: Pre- (2011-2015); Post- (2016-2021)
Water Quality: Pre- (2011-2015); Post- (2016-2021)
• 2011- Data collection started December 22
Salinity: Pre- (2011-2015); Post- (2016-2021)
• 2011- Data collection started July 27
Hydrology: Pre- (2007-2015); Post- (2016-2021)
Vegetation: Pre- (2011-2015); Post- (2019-2021); Transition Years
(2016-2018)
• DCUT11:
Flow (Observation): Pre- (2013-2017); Post- (2018-2021)
Benthic: Pre- (2013-2017); Post- (2018-2021)
Fish: Pre- (2013-2017); Post- (2018-2021)
Metals: Pre- (2013-2017); Post- (2018-2021)
Water Quality: Pre- (2013-2017); Post- (2018-2021)
Salinity: Pre- (2013-2017); Post- (2018-2021)
Hydrology: Pre- (2013-2017); Post- (2018-2021)
Vegetation: Pre- (2013-2017); Post- (2020-2021); Transition Years
(2018-2019)

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Figure I -Al. Vicinity map of monitored creeks in the PCS creeks study.
I-A-7

Table I -Al. All data collected by parameter and by creek. See text for years of evaluation. The year 2009 marked the end of Alt E activities and the beginning of Mod Alt L activities. Metals were sampled
in the water column and the sediment beginning in 2011; in earlier years only sediment was sampled.
Site/Parameter
1998
1999
2000
2001
2002
2003
2004
2005
2007
2008
2009
2010
2011
2012
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J ASOND
JFMAMJJ ASONDJFMAMJJ
ASONDJFMAMJJASONDJ
FMAMJJASONDJ
F M A M J J A S O N D
J F M A M J J A S O N D
Broomfield Swamp Creek
Salinity
Wetland water le l
Water quality
Vegetation
Fish
Benthos
Metals
SCUT1 (control)
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
Jacks Creek
Flow
Salinity
Wetland water lesel
Water quality
Vegetation
Fish
Benthos
Metals
V/�aW
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/i/
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V///
/ / /
❑
❑
fL1
❑
❑
❑
❑
South Creek (control)
z
0
Salinity/Water depth
Little Creek (control)
NO MONITORING OC(
Salinity
Water quality
Fish
Benthos
Metals
I
1
CI CyMIJacobs
Creek
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
.V.V.
iiiiiiiiiiiiiiiiiiiii/
/aV��
ea w 4
i/���///'
/ / /
r di
PA2 (control)
Salinity
Water quality
Fish
Benthos
Metals
MI
III
MI
MI
III
MI
Drinkwater Creek
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
V
f Z��/7
/////%/////////////////////�///�%////////////////////////
V�//
/lG / /
I no data
Fe .cl
rA
pre -Mod Alt L El post -Mod Alt L
El control creek
I -A-8

Table I -Al (continued).
Site/Parameter
2013
2014
2015
2016
2017
2018
2019
2020
2021
J F MA MJ J AS ON DJ
F MA MJ J AS ON DJ
F MA MJ J AS ON DJ
F MA MJ J A S ON DJ
F MA MJ J A S ON DJ
F MA MJ J A S ON DJ
F MA MJ J A S ON DJ
F MA MJ J AS ON DJ
F MA MJ J AS ON D
Broomfield Swamp Creek
Salinity
Wetland water leuel
Water quality
Vegetation
Fish
Benthos
Metals
r/////////////////////////////////i
///////////////////////////////
/////////////////////////////A
////////////////////////
///////////////////////////////
%//////////////////////////////
///////////////////////////////i
///////////////////////
//
../////////////////////////////
//////////////////////////////A
SCUT1 (control)
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
I
❑
Li
❑
_
J
J
J
❑
Jacks Creek
Flow
Salinity
Wetland water level
Water quality k'////////////////////////////////////////////////////////////
Vegetation
Fish
Benthos
Metals
r/////////////////////////i//////////////////////////////
l//////////////////////////////1////////////////////////////////
��////////////////////////////J////////////////////////////////
ei
In
ei
=1
❑
=1
❑
=I
❑
I
I transition I
I transition I
I
skip
MI
1.1
ei
❑
❑
r,
rar
vr,III
ro,a
❑
❑
❑
South Creek (control)
Salinity/Water Depth
I
Little Creek (control)
Salinity
Water quality
Fish
Benthos
Metals
I
•
❑
❑
❑
❑
1111
=11
=11
=11
I
I I
lli
•
❑
❑
•
•
❑
•
IQ
❑
❑
❑
❑
Jacobs Creek
Flow
Salinity
Wetland water leuel
Water quality
Vegetation
Fish
Benthos
Metals
i/// ///4
I
/ /A///////////////////////////
i/////7
1=1
•
❑
a
❑
=11I
❑
1 transition I
I transition I
I transition I
skip
IM1
111
1=1
111
❑
pp�
MU
=11
I
I
❑
❑
❑
❑
❑
PA2 (control)
Salinity
Water quality
Fish
Benthos
Metals
1
❑
•
•
•
❑
❑
❑
❑
❑
•
❑
❑
❑
❑
❑
❑
❑
❑
Drinkwater Creek
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
.
W
I_
IM
ili
•
❑
❑
❑
❑
❑
I transition I
I transition I
I transition I
❑
•
❑
III
❑
❑
❑
❑
❑
❑
❑
pre -Mod Alt L d post -Mod Alt L
El control creek
I-A-9

Table I -Al (continued).
Site/Parameter
1998
1999
2000
2001
2002 2003
2004
2005
RING OCCURRED IN 2006
T
.I L N
O
O
2008
2009
2010
2011
2012
J FMAMJJ ASONDJ
FMAMJ JASONDJ
FMAMJ JASONDJFMAMJJASONDJ
F M A M J J A S O N D J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
J F M A M J J A S O N D
Long Creek (control)
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
I
AM
MI
III
•
•
Tooley Creek
p��
f'��(7�j������///
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals1.1
�c l
/i//////a////,/////////////
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I transition I
�'!!l,000Ga
p�1
KGGiGGiG
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ror,
rA•
Muddy Creek (control)
■
MI
•
MI
•
MI
•
MI
.
MI
.
MI
•
MI
•
■
MI
•
•
MI
•
•
MI
•
y
MI
•
a
MI
•
a
Fish
Benthos
Metals•
no data I
•
•
Pamlico River (control)
NO MONITO
Salinity/Water Depth
Huddles Cut
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
/I/
///
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�////
// /// /
//.
%///////47
a
I incomplete
/////////////////////////////////////////////////////////////q/////////////////////r�//////r�//////////////////////�//////��
./ �/////
//A
I transition I
I transition I
I transition I
Porter Creek
r
�/,
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
///%///����%���/��%��/����%��/����%��/�/��%��/�/.Ii
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////
p�7
p
FA
re,
FA
pre -Mod Alt L .1 post -Mod Alt L
• control creek
I-A-10

Table I -Al (continued).
Site/Parameter
2013
2014
2015
2016
2017
2018
2019
2020
2021
J FMAMJJ ASONDJ
FMAMJJ ASONDJ
FMAMJJ ASONDJ
FMAMJ J ASONDJ
FMAMJJ ASONDJ
FMAMJJ ASONDJ
FMAMJJ ASONDJ
FMAMJ J ASONDJ
FMAMJJ ASOND
Long Creek (control)
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
I
I
I 1
I
I
I
I
P
P
P
P
P
P
P
P
Il
I I
1
I I
I I
II
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Tooley Creek
s
Flow
Salinity
Wetland water level
Water qualityII
Vegetation
Fish
Benthos
Metals
1=1-
I transition I
I transition I
I skip I
I skip
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
MI
❑
❑
❑
❑
Muddy Creek (control)
-
Fish
Benthos
Metals
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
•
NI
❑
❑
❑
❑
Pamlico River (control)
1
Hurricane damaged
Water depth
Salinity
pier- no data Oct
1
2018-Dec 2019
Huddles Cut
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
skip
skip
-
❑
❑
❑
•
•
•
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Porter Creek
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
%%/////////////%/////////////////////%///////////////////// %�////////////%///////////////
l�/////////////7/////////////////7 .4%////////////7///////////////
�./7///////////�/7//////////////////�/7//////////////////Xt//////////�/7///////////////
%%////////////%////////////)/////%////////////////////%/////////////%///////////////
I transition I
I transition I
I transition I
FJ
FJ
FJ
-
®
ra
ea
r,
a
em❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
pre -Mod Alt L
El post -Mod Alt L El control creek
I-A-11

Table I -Al (concluded).
Site/Parameter
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
J FMAMJ JASONDJ
FMAMJJASONDJ
FMAMJ J ASONDJ
FMAMJ J ASONDJ
FMAMJ J ASONDJ
FMAMJ J ASONDJ
F M A M J J ASONDJ
FMAMJJASONDJ
FMAMJJASONDJ
FMAMJJASONDJ
FMAMJ J ASOND
Durham Creek (control)
Salinity/Water Depth
DCUT11
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
/////////////////////////////
////////////////////////////////.%//////////////////////////////////////////////////////////////«///////////////////////////////4
1
I
AI
////f��1f��ff���1f��ff���1f��1f���%��1f��1f��ff���1f//./�1f��ff���1f��1f/f�1f��ff���1f��1f
rr������irrrrrrrrrrrrrr�����t/rrrrrrrrrrrr������irrrrrrr�rrrrrr������irrrrrrrrrrrrrr�,���i������irrrrrrrr������i��i
�irrrrrrrrrrrrrr����47 4
❑
❑
I transition I
I transitionI.
rd
®
ej
r
pa
❑
❑
❑
❑
❑
❑
DCUT19 (control)
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
L
Mr —
11_
III
❑
❑
I no data I
I no data
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
Duck Creek (control)
Flow
Salinity
Wetland water level
Water quality
Vegetation
Fish
Benthos
Metals
10
I
1
I
I I I I I I
I
I
I
1
7
•
❑
III
❑
❑
I no data
•
•
1.1❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
❑
pre -Mod Alt L
1.1 post -Mod Alt L 1. control creek
I-A-12

Table I-A2. Monitored parameters, equipment, and frequency of data collection. Water
quality samples are collected and Aqua TROLLs are downloaded every two weeks.
Rain gauges and Level TROLLs are downloaded once a month.
Parameter
Hydrology - shallow groundwater/surface water
Methods/Equipment
Frequency
Wetland hydrology - alluvial bottomland
Estuarine/creek water levels
Flow events
LeveITROLLs
AquaTROLLs
Observation
Every 1.5 hours/monthly field check
Every 1.5 hours/2 week field check
Monthly field check
Water Quali
ty
Salinity/conductivity/temperature
Total dissolved phosphorus
Dissolved orthosphosphate
Ammonium nitrogen
Nitrate nitrogen
Dissolved Kjeldahl nitrogen
Particulate nitrogen
Particulate phosphorus
Chlorophyll a
Total organic carbon (TOC)
Particulate organic carbon (POC)
Total dissolved nitrogen (TDN)
Metals in water
(Ag, As, Cd, Cr, Cu, Fe, Mo, Se, Zn)
Metals in sediment
(Al, Ag, As, Cd, Cr, Cu, Fe, Mo, Se, Zn)
AquaTROLLs
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Field to lab
Every 1.5 hours/2 week field check
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
Every 2 weeks
August
August
Rainfall by major basin
Texas Electronic TR-525USW
Continuous; every 0.1 inch
Benthos - estuarine
Ponar and sweep
May
Fish - estuarine
Otter trawl/fyke net
Weekly - April thru June
Vegetation - alluvial bottomland
Transects w/herb and shrub plots
Late growing season - Aug/Sept
In -situ water quality parameters
Monitored in conjunction with
fish/benthos sampling, and/or
water quality sample collections
- water temperature
- dissolved oxygen
- conductivity
- specific conductivity
- salinity
- pH
- turbidity w/WQ
- secchi depth w/fish/benthos
- water depth w/fish/benthos
- percent SAV visible w/fish/benthos
YSI handheld
YSI handheld
YSI handheld
YSI handheld
YSI handheld
YSI handheld
Turbidimeter
Secchi disc
Tape measure
Visual
Weekly with fish collections
Spring with benthos collections
Every two weeks w/WQ collections
1Not all creeks are monitored every year.
I-A-13