HomeMy WebLinkAbout20080868 Ver 2_Wetland Hydrology Monitoring - 2018 Update_20190903idutrien-
Feeding the Future -
Federal Express
August 30, 2019
Ms. Karen Higgins
401 and Buffer Permitting Unit Supervisor
NC DEQ —Division of Water Resources
512 N. Salisbury St, ff942-E
Raleigh, NC 27604
Dear Ms. Higgins:
The NC Division of Water Resources issued to PCS Phosphate Company, Inc. 401 Certification No. 3771,
DWQ #2008-0868 version 2.0 on January 15, 2009, for our mine expansion in Beaufort County. Portions
of Conditions 9, 12 and 13 of the Certification require groundwater monitoring of the protected portion
of the Bonnerton Road Non-Riverine Wet Hardwood Forest in order to ensure that the existing hydrology
of this site is maintained.
Monitoring of the hydrology has occurred since 2015, and the first deep well in Bonnerton pumping water
from the Castle Hayne Aquifer was turned on in December 2016. Enclosed is a report titled "Wetland
Hydrology in the Bonnerton Road Non-Riverine Wet Hardwood Forest — 2018 Update, Beaufort County,
North Carolina" reporting on the monitoring results.
If you have any questions, please call me at (252) 322-8249, or email at jeff,furness@nutrien.com.
Sincerely,
1
Jeffrey C. Furness
Senior Scientist
Enclosure
PC: Anthony Scarbraugh— DWR,Washington w/encl.
K. Alnandy w/Intro & Summary
23-01-004-29 w/encl.
S. Cooper — CZR w/o encl.
1530 NC Hwy 306 South, Aurora, NC USA 27806
1 Effective January 1, 2018, PCs Phosphate Company, Inc. is an indirect subsidiary of Nutrien Ltd. PCS Phosphate Company, Inc.
remains the legal operating entity and permittee.
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WETLAND HYDROLOGY IN THE
BONNERTON ROAD NON-RIVERINE WET HARDWOOD FOREST
BEAUFORT COUNTY, NORTH CAROLINA
Prepared for:
PCS Phosphate Company, Inc.
Prepared by:
CZR Incorporated
August 2019
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LIST OF APPENDICES
Appendix A Soil Profile Descriptions at Bonnerton NRWHF and Upper Porter Creek Monitoring Wells
Appendix B 2017, 2016, and 2015 Wetland Hydroperiods for Bonnerton NRWHF and Upper Porter
Creek Monitoring Wells
Appendix C 2018 Hydrology Graphs of Bonnerton Level TROLLS
Bonnerton NRWHF Wetland Hydrology iv PCS Phosphate Company, Inc.
2018 Update August 2019
1.0 Introduction
Per Conditions 9 and 13 of the modified 401 Water Quality Certification issued in January 2009 for the
PCS Phosphate mine continuation near Aurora NC (DWQ#2008-0868, version 2.0), wetland hydrology of
the portions of the Bonnerton Road non-riverine wet hardwood forest (NRWHF) shown as "135A" and
"58A" on Figure 1 shall be monitored before and after the mine moves through the area between the
avoided NRWHF areas and within the permitted mine boundary (Figure 2). The data collected are to
ensure that the wetland hydrology of the two NRWHF areas avoided by the permitted mine boundary is
maintained after mine impacts are completed and/or the mined -through area has been reclaimed.
1.1 Area Description
The Bonnerton Road NRWHF is located on a peninsula between Durham Creek to the west and Porter
Creek to the east; both creeks flow north to the nearby Pamlico River (Figure 1). Surface water flow of
the peninsula into the two creeks is separated by the divide known as the Suffolk Scarp, a geomorphic
feature whose highest elevation in this vicinity is just to the west of the 135A NRWHF (Figure 1). Slope
of the terrain on the most eastern side of the scarp towards Porter Creek is —0.2 percent, while the slope
approaches 1 percent nearer to the eastern toe of the Suffolk Scarp. Similar to other outer coastal plain
interfluves in North Carolina, where the underlying Castle Hayne limestone is close to the surface, the
forested landscape of the peninsula is gently rolling with occasional small closed depressions and small
non-hydric areas of higher elevation.
2.0 Methodology
2.1 Water Level
To monitor the pre -mine hydrology of the monitored area, a total of 14 semi -continuous electronic Level
TROLL 500 data -logger water level monitoring wells, manufactured by In -Situ, were installed in June and
July 2015 at the locations shown in Figure 3 (BHW1-BHW14). In addition to the 14 wells installed in
2015, there are six additional wells used to monitor the wetland hydrology adjacent to upper Porter
Creek for a separate project (locations shown on Figure 3). Two other types of monitoring wells have
been used at four of these locations (PCW1, PCW3, PCW4, and PCW6) since 2006 [Remote Data Systems
(RDS) WL20s and WL80s and RDS Ecotone 20s and Ecotone 80s] but Level TROLL 500s have been in place
at all six locations since 2011 (wells at PCW2 and PCW5 were added).
Each of the 14 Level TROLLS is housed inside a 2-inch diameter PVC well screen (0.010-inch slots)
installed to a depth of approximately 32 inches and backfilled with filter sand. The recorder is
suspended on a 43.75-inch cable in the well screen to record water levels within at least -20 inches
below the ground surface and up to +20 inches above the surface. Among the 14 wells the range of
water levels which can be recorded below the surface ranges from -24.25 to -31.75 inches and the range
of surface water which can be recorded ranges from +18 to +26 inches. The units record the water level
every 1.5 hours (16 times per day). The six upper Porter Creek wells are housed inside a 3-inch diameter
PVC well screen with 0.010-inch slots, but the Level TROLL cable is 60.25 inches long and among these
wells, the range for below ground water level is -29.75 to -33.25 inches, and the range of surface water
Bonnerton NRWHF Wetland Hydrology 1 PCS Phosphate Company, Inc.
2018 Update August 2019
TABLE OF CONTENTS
1.0 Introduction............................................................................................................................................1
1.1 Area Description.................................................................................................................................1
2.0 Methodology...........................................................................................................................................1
2.1 Water Level.........................................................................................................................................1
2.2 Rainfall and Drought........................................................................................................................... 2
2.3 PCS Deep Wells and Water Levels in CZR Level TROLLs......................................................................3
3.0 Results and Discussion............................................................................................................................4
3.1 Soil Series and Soil Profiles.................................................................................................................4
3.2 Rainfall and Drought in 2018, 2017, 2016, and 2015.........................................................................4
3.3 Wetland Hydrology.............................................................................................................................5
3.4 Mine Perimeter Deep Well Pumps and Near Surface Hydrology.......................................................6
4.0 Summary.................................................................................................................................................7
5.0 Literature Cited.......................................................................................................................................8
Cover Photo: view to northwest from vicinity of wells BHW 12/BHW13, 30 March 2018
Bonnerton NRWHF Wetland Hydrology ii PCS Phosphate Company, Inc.
2018 Update August 2019
LIST OF FIGURES
Figure 1 401 Water Quality Certification Conditions 9 and 13 Wetland Hydrology Monitoring .. F-1
Figure 2 Non-riverine Wet Hardwood Forest Areas (135A and 58A) avoided by Mod Alt L......... F-2
Figure 3 Bonnerton NRWHF Hydrology Monitoring Wells............................................................ F-3
Figure 4 Bonnerton NRWHF Wells and Soil Series........................................................................ F-4
Figure 5 2018 Porter Creek and WETS -Aurora 6N Rainfall........................................................... F-5
Figure 6 2017 Porter Creek and WETS -Aurora 6N Rainfall........................................................... F-6
Figure 7 2016 Porter Creek and WETS -Aurora 6N Rainfall........................................................... F-7
Figure 8 2015 Porter Creek and WETS Aurora 6N Rainfall............................................................ F-8
Figure 9 Bonnerton NRWHF Hydrology Monitoring Sites and Deep Well Locations .................... F-9
Figure 10 2015 — 2018 Hydrology during Deep Well Pump Operations ........................................ F-10
LIST OF TABLES
Table 1 Monthly and annual rainfall for 2018, 2017, 2016, and 2015 recorded at the Porter
Creek rain gauge and at the PCS Aurora 6N station....................................................... T-1
Table 2 Drought conditions for the south side of Pamlico River in the vicinity of South Creek for
theyears 2012-2018....................................................................................................... T-1
Table 3a Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper
Porter Creek during WETS normal and below normal rainfall in 2018 .......................... T-2
Table 3b Hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and upper
Porter Creek independent of WETS thresholds in 2018................................................. T-3
Table 4a Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and
upper Porter Creek during WETS normal or below normal rainfall from 2015-2018.... T-4
Table 41b Summary of hydroperiods for monitoring wells in and near Bonnerton NRWHF areas and
upper Porter Creek independent of WETS thresholds from 2015- 2018........................ T-5
Table 5 Bonnerton Deep Well Operation Dates.......................................................................... T-6
Table 6 Details of the final models for Level TROLLs in Bonnerton Hardwood Forest ............... T-7
Bonnerton NRWHF Wetland Hydrology iii PCS Phosphate Company, Inc.
2018 Update August 2019
is +32.75 to +36.5 inches. (The longer cable is used for the upper Porter Creek wells as part of a different
monitoring project methodology and protocol.) To prevent damage by bears, the above -ground portions
of all well screens were surrounded by a fence enclosure made of metal T-posts and strands of barbed
wire. All 20 monitoring wells were checked and downloaded once a month. Most of the 14 wells are
located in portions of the hardwood flat at slightly higher elevations than the six Porter Creek wells;
however, no elevations have been surveyed so perceived differences in elevation are not quantified.
Wetland hydroperiods were calculated for each monitoring well during the growing season. A
hydroperiod is defined as consecutive days during the growing season that the water table is within 12
inches of the surface or the surface is inundated, and is expressed as a percentage of the growing
season. For this project, the growing season is defined by the Regional Supplement to the Corps of
Engineers Wetland Delineation Manual: Atlantic and Gulf Coastal Plain Region (Version 2.0) (USACE
ERDC 2010) to match the Natural Resources Conservation Services' (NRCS) WETs tables and is 282 days
long in non -leap years (28 February-6 December). For the purposes of this report, a hydroperiod for 6
percent or more of the growing season is considered a wetland hydroperiod.
2.2 Rainfall and Drought
Rainfall was collected and measured using a RDS tipping bucket style rain gauge until 2018 when it
became obsolete; it was replaced with a Texas Electronic TR-525USW style bucket with similar function
and accuracy (+/- 1% at 0-2 inches/hour). Rainfall lands in the funnel of the rain gauge and is directed
down to the bottom of the funnel where it drips into two carefully calibrated "buckets" balanced on a
pivot. Once the bucket has reached its calibrated amount, 0.010 inch of rain, it tips down registering the
event as the opposite bucket rises to begin collecting the next calibrated amount of rain. Water is
allowed to drain out of a hole on either side of the rain gauge underneath each bucket. The Porter
Creek rain gauge was used for local rainfall data (Figure 3) except during a data gap or malfunction when
the Aurora Station 6N data was used (located approximately 4.7 miles away). Since 2013, another rain
gauge (located 3.3 miles away at DCUT19) may also serve during data gaps.
Long-term rainfall collected at the NOAA station PCS Aurora 6N was used by the Natural Resources
Conservation Service (NRCS) to provide what is known as the WETS Aurora Station 6N rainfall data.
These data were downloaded by CZR Incorporated (CZR) and used to build annual rainfall figures to
determine periods of normal rainfall. "Range of Normal" refers to the 30th and 70th percentile
thresholds of the probability of onsite rainfall amounts outside of the normal range (based on historical
averages from 1971-2000). In December of 2016, the long-term historical averages were updated to
include 1981-2010.
Drought conditions are monitored nationally by several indexes. Periods of drought can affect the
hydrology of a site and should be taken into consideration when wetland hydrology is interpreted. As
suggested in the USACE 2010 Regional Supplement, the Palmer Drought Severity Index (PDSI) was used
to determine drought periods for the area. The PDSI is useful because it "takes into account not only
precipitation but also temperature, which affects evapotranspiration, and soil moisture conditions" (US
Army Corps of Engineers 2010). The PDSI is calculated monthly and is based on major climatic divisions
within each state (US Army Corps of Engineers 2010). Although the index is not site -specific, for the
Bonnerton NRWHF Wetland Hydrology 2 PCS Phosphate Company, Inc.
2018 Update August 2019
purposes of this report it provided sufficient information to make general statements about drought
conditions in the area. Drought conditions described by this index by month and year are for the NOAA
Central Coastal Plain region of North Carolina. The US Drought Monitor website
(http://droughtmonitor.unl.edu) provides a synthesis of multiple indices and impacts and reflects the
consensus of federal and academic scientists on regional conditions on a weekly basis (updated each
Thursday). The area used for regional drought conditions includes numerous watersheds of various
sizes and may cover portions of more than one county.
2.3 PCS Deep Wells and Water Levels in CZR Level TROLLS
Water depth within creeks and wetlands should respond to changes in environmental conditions. For
example, precipitation events should increase the amount of belowground and aboveground water. The
operation of pumps within PCS deep wells near impact creeks could potentially disrupt how the
hydrology of surrounding wetlands responds to any change in environmental conditions. If the
relationships between environmental variables and hydrology changes during or after the operation of
pumps within deep wells, then some effect of Mod Alt L activities may be inferred.
Water level data collected by CZR from Level TROLLs in the Bonnerton non-riverine wet hardwood forest
help investigate these potential changes in relationships. Level TROLLS measure water levels across a
range of approximately 5 feet with most data collected from —24 to +24 inches at each location
(configuration/installation varies by site conditions). Information on the operation of pumps within
each 20-inch diameter deep well was provided by PCS. Each deep well is drilled approximately 250-feet
deep through several confining layers in order to depressurize the Castle Hayne Aquifer under the active
mine. Each pump can produce 3,000 gallons/minute.
Daily hydrology data from each Level TROLL was split into three time periods: pre-, during-, and post -
pump operation. For each of these time periods, a dynamic multiple linear regression model was
constructed with hydrology (i.e., water depth) as the response variable and Tar River discharge,
precipitation, wind speed, and wind direction as predictor variables. Tar River discharge was lagged by
1, 5, 10, 15, and 20 days and precipitation was lagged by 1, 2, 3, 4, and 5 days. Wind direction was
converted into a categorical variable to represent eight directions (north, northeast, east, etc.). Water
depth was also lagged one day and included in all models as another predictor variable; however, this
variable was only included to control for temporal autocorrelation and not for any explanatory
purposes.
A full model with all of the predictor variables was first constructed. Predictor variables were removed in
a step -wise manner based on their significance value (i.e., P-value). However, a predictor was not
removed if it was the only representative remaining of the four main predictor types (wind speed, wind
direction, discharge, or precipitation). Thus, each final model included at least one predictor of wind
speed, wind direction, discharge, and precipitation. Final predictor variables were compared to one
another using the absolute values of the calculated t-value. Those variables with the highest t-values for
each final model will be referred to as 'important' to distinguish from significant or non -significant
variables that did not produce high t-values. Models were fit using the dynlm package in R (Zeileis
2016).
Bonnerton NRWHF Wetland Hydrology 3 PCS Phosphate Company, Inc.
2018 Update August 2019
3.0 Results and Discussion
3.1 Soil Series and Soil Profiles
The soil survey for Beaufort County NC (Kirby 1995) and web soil survey data show the area of the
Bonnerton NRHWF as underlain mostly by Tomotley fine sandy loam and several other soil series which
are all considered hydric; two of the soil series are considered non-hydric (Altavista fine sandy loam and
Augusta fine sandy loam) (Figure 4). Since earlier well installation soil profiles were described by several
biologists at different times, in 2016/2017, soil profiles at all 20 well locations were re -described using
the NRCS hydric soil indicators (USDA 2010) as directed by the 2010 regional supplement (Appendix A).
3.2 Rainfall and Drought in 2018, 2017, 2016, and 2015
Monthly rainfall recorded in 2018, 2017, 2016, and 2015 at the Porter Creek rain gauge and at the PCS
Aurora 6N station is shown in Table 1.
In 2018, monthly rainfall totals for January, February, and March were below the WETS 70t' percentile
(Figure 5); the majority of the year was above the WETS normal range. The wettest tropical cyclone on
record in the Carolinas, Hurricane Florence (slow moving Category 1 storm), made landfall in
Wrightsville Beach, NC on 14 September. Rainfall was generally 4 to 8 inches over Beaufort County with
a storm total of 6.95 inches in Belhaven. The heaviest rainfall totals fell across the extreme southern
part of the county which caused flash flooding in some locations.
In 2017, monthly rainfall totals for January, February, October, and November were below the WETS
30`" percentile (Figure 6). April was the only month with total rainfall above the WETS normal range. A
strong coastal low pressure system produced heavy rainfall and flash flooding from 23 April to 25 April.
Based on the 30-day rolling total, rainfall from 24 April through 24 May was considered above normal.
In 2016, monthly rainfall was greater in February, June, July, September and October when compared to
the WETS percentiles (Figure 7). Rainfall for March and mid to late August were below normal with the
remainder of the year within WETS normal range. Hurricane Matthew, a Category 1 storm, made
landfall in Cape Romain National Wildlife Refuge, SC on 8 October 2016. Above average rainfall spikes
began in the PCS area on 7 October, coincident with arrival of the outer rain bands of the hurricane in
North Carolina. There were several periods of above normal rainfall that were excluded when
hydroperiods were calculated for normal and below normal rainfall: 3 February through 5 March, 3 June
through 5 July, 7-30 July, 11-30 September, and 7 October through 7 November.
In 2015, monthly rainfall was greater in June, October, and late November through late December when
compared to the WETS percentiles (Figure 8). At the end of January and March, the 30-day rolling total
was slightly above normal. Rainfall for the month of August was below normal and the rainfall for the
remainder of the year fell within the WETS normal range. Periods of above normal rainfall included 3
June through 3 July, 2 October through 1 November, and 20 November through 20 December.
For 2018, the US Drought Monitor (http://droughtmonitor.unl.edu) indicated one week was considered
abnormally dry (DO); the remaining weeks had no drought status in the vicinity of the Bonnerton Road
NRHWF "135A" and "58A" project areas (Table 2; three years prior to 2015 are also shown). In 2017,
Bonnerton NRWHF Wetland Hydrology 4 PCS Phosphate Company, Inc.
2018 Update August 2019
five weeks were considered abnormally dry (DO). During 2016, three weeks in April were assigned
drought condition (DO — Abnormally Dry) or 6 percent of the entire year and 7 percent of the 41-week
growing season (Table 3). In 2015, all 41 weeks of the growing season were considered normal with no
drought status.
3.3 Wetland Hydrology
Monitoring Year 2018
All BHW and PCW wells exhibited wetland hydroperiods in 2018, even when periods of above normal
were excluded (Tables 3a and 3b). Of the 14 BHW wells, eight wells had hydroperiods for >12.5-25.0
percent and six wells had hydroperiods for >25-75 percent of the growing season during all rainfall
conditions. Similarly, all six PCW wells had hydroperiods for >12.5-25.0 percent.
When hydroperiods that occurred during above normal rainfall were removed (Figure 5), six wells
decreased from >25.0-75.0 percent to >12.5-25.0 percent of the growing season; all other wells
maintained hydroperiods for >12.5-25.0 percent of the growing season.
Monitoring Year 2017
All BHW and PCW wells exhibited wetland hydroperiods, even when periods of above normal were
excluded (Tables B-1a and 1b, Appendix B). Of the 14 BHW wells, eight wells had hydroperiods for
>12.5-25.0 percent and six wells had hydroperiods for >25-75 percent of the growing season during all
rainfall conditions. Similarly, all six PCW wells had hydroperiods for >12.5-25.0 percent.
When hydroperiods that occurred during above normal rainfall were removed, six wells decreased from
>25.0-75.0 percent to >12.5-25.0 percent of the growing season; all other wells maintained
hydroperiods for >12.5-25.0 percent of the growing season.
Monitoring Year 2016
The first full monitoring year for the 14 BHW wells was 2016. All BHW and PCW wells exhibited wetland
hydroperiods during the 2016 growing season (Tables B-la and lb, Appendix B). Of the 14 BHW wells,
hydroperiods for eight wells were >12.5-25.0 percent and six wells were >25.0-75.0 percent of the
growing season. Similarly, all six PCW wells had hydroperiods for>12.5-25.0 percent.
When above normal rainfall was removed (Figure 6), only one well (PCW1) decreased from >12.5-25.0
percent to>_6.0-12.5 percent of the growing season during normal and below normal rainfall conditions.
Monitoring Year 2015
The 14 BHW wells were installed at the end of June 2015 and beginning of July 2015; the six upper
Porter Creek wells collected data all year. All 14 semi -continuous BHW wells exhibited wetland
hydroperiods using all rainfall data between June and December and the six Porter Creek wells exhibited
wetland hydroperiods between February and December (Tables B-la and 1b, Appendix B). Among the
14 wells in the higher elevations of the hardwood flat, BHW6 had the longest hydroperiod of 23.8
Bonnerton NRWHF Wetland Hydrology 5 PCS Phosphate Company, Inc.
2018 Update August 2019
percent of the growing season while longest hydroperiods at the remaining wells were in the range of
>_6.0 - 12.5 percent of the growing season (Table 4b). The six wells in upper Porter Creek are located in
somewhat lower elevations than some of the other 14 wells and using all 2015 rainfall data, longest
hydroperiods were >12.5-25.0 percent of the growing season with PCW6 exhibiting the longest
hydroperiod of 24.5 percent (Appendix B).
When dates with above normal rainfall during 2015 (Figure 7) were removed and only normal and below
normal rainfall periods are used for evaluation, three BHW wells did not exhibit any wetland
hydroperiods between June and December (one of these four exhibited water within 12 inches of the
surface but for less than 6 percent of the growing season), nine had longest hydroperiods in the range of
>_6.0- 12.5 percent, and longest hydroperiod at one well was >12.5-25.0 percent (Table 4a). All six PCW
wells had wetland hydroperiods in the range of >12.5-25.0 percent of the growing season during normal
and below normal rainfall.
3.4 Mine Perimeter Deep Well Pumps and Near Surface Hydrology
At agency request, PCS provided CZR information about the locations and dates of operation (turn -ON
and turn -OFF dates) of pumps in deep wells around the Bonnerton Mod Alt L mine perimeter for
analysis of potential effects on adjacent wetland hydrology attributed to the pump activity. As of 31
December 2018, three deep well pumps in the vicinity of the Level TROLLS had been in operation since
2017, turned off in 2018, and suitable for the analysis. Graphs of the water levels of the 14 adjacent
wetland wells in the Bonnerton NRWHF were examined in late 2017 through December 2018. The
graphs do not reveal any apparent change in water level in the last weeks of 2017 through December
2018 other than response to rainfall events. These graphs are shown in Appendix C of this report.
Operation dates for the pumps in the PCS deep wells in the Bonnerton Tract as of the end of 2018 are
shown in Table 5. This 2018 update is the first to incorporate an analysis on deep well pump operations
and the wetland hydrology in the non-riverine wet hardwood forest.
There are three deep wells in close proximity to the eastern side of the Bonnerton non-riverine wet
hardwood forest and used for the analysis (Figure 9). The deep well pumps were in operation from
February 2017 to October 2018 in wells 1108, 1109, and 1110; and the 2018 analysis focused on the
on/off dates for pumps in these deep wells. The hydrology at four Level TROLLs was examined from July
2015 forward and those graphs are shown in Figure 10. The Pre time period was set from July 2015
when Level TROLLS were installed through January 2017, the During time period was set from February
2017 through October 2018, and the Post time period was set from November 2018 through December
2018.
Detailed results of all final models are given in Table 6. For all four Level TROLLS rainfall was the
important predictor variable for all three periods and had positive coefficients; the greatest influence
was from rainfall the day of (0 days) for Pre/During/Post except for BHW1 which had a greater influence
for a 1 day lag for During; by Post, rainfall as a variable for BHW1 returned to 0 days. However, the
difference between the influences of rainfall was almost indiscernible between 0 and 1 day. Wind
direction and wind speed were never important variables but direction was significant for each Level
Bonnerton NRWHF Wetland Hydrology 6 PCS Phosphate Company, Inc.
2018 Update August 2019
TROLL in at least one period. Southerly winds increased depth at each LevelTROLL for During and west
winds decreased depth at all Level TROLLS During except BHW1. Northerly winds were responsible for
increased depth at BHW2 and BHW4.
Discharge was only a significant predictor for BHW1 Pre but was never an important variable for any
Level TROLL.
4.0 Summary
During 2018, 2017, 2016, and 2015 monitoring years, all 20 ground water monitoring wells exhibited
wetland hydroperiods when all rainfall data are used to tabulate consecutive number of days of water
levels above -12.0 inches (relative to ground surface) as shown in Table 4a. The 14 Bonnerton wells
were not installed until June of 2015; therefore, the earliest hydroperiods and perhaps the longest
hydroperiods were not recorded for that year. In 2018, 2017, and 2016 all BHW and PCW wells exhibited
wetland hydroperiods, even when above average rainfall was excluded (Table 4a). Over these three
years, longest hydroperiods during WETS normal thresholds or below for 19 of the 20 wells were all
>14.8 percent; the longest hydroperiod for the other well was 12.4 percent in 2016 and >16 percent for
the other two years (Table 4a). At first glance, the 2018 longest hydroperiods appear to have less
variability and be shorter than previous years; however, 64 percent of the 2018 growing season had
rainfall periods above the 70th percentile and not included in the tally (Table 4a).
While the amount of annual rainfall, the months in which more or less rainfall occurs, and the percent of
weeks with drought status varies from year to year, the wetland hydrology in the Bonnerton non-
riverine wet hardwood forest over the four years appears to be relatively consistent when all
hydroperiods are shown (Table 4b); the wettest well (BHW6) remains the wettest and the driest well
(PC1) remains the driest.
Bonnerton NRWHF Wetland Hydrology 7 PCS Phosphate Company, Inc.
2018 Update August 2019
5.0 Literature Cited
Kirby, Robert M. 1995. Soil Survey of Beaufort County, North Carolina. Natural Resources Conservation
Service, United States Department of Agriculture.
Soil Survey Staff. Undated. Natural Resources Conservation Service, United States Department of
Agriculture. Web Soil Survey. Available online at http://websollsurvey.nres.usda.gov/. Accessed
[09/10/2012].
US Army Corps of Engineers. 2010. Regional supplement to the Corps of Engineers wetland delineation
manual: Atlantic and Gulf coastal plain region. Version 2. J.S Wakeley, R.W. Lichvar, and C.V.
Noble, eds. ERDC/ELTR-10-20, Vicksburg, M5.
US Department of Agriculture, Natural Resources Conservation Service. 2010. Field Indicators of Hydric
Soils in the United States, Version 7.0. L.M. Vasilas, G.W. Hurt, and C.V Noble (eds.) USDA, NRCS,
in cooperation with the National Technical Committee for Hydric Soils.
Zeileis, A (2016) dynlm: Dynamic Linear Regression. R package version 0.3-5. URL http://CRAN.R-
proiect.org/package=dynlm
Bonnerton NRWHF Wetland Hydrology 8 PCS Phosphate Company, Inc.
2018 Update August 2019
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LEGEND I
NON-RIVERINE WET HARDWOOD FOREST
AREAS 135A AND 58A
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135A 2,100 0 2,100 Feet
401 Water Quality
�o Certification Conditions 9 and 13
Wetland Hydrology Monitoring
PCS PHOSPHATE MINE CONTINUATION
Scale: As shown Drawn by: TLJ
D 174579eONN_RmnN NRwnF z0
Date: 08/07/18 File[ eonz NewRF_roPo_zo nRPr
Pv jApproved by: Figure 1
Rnnnartnn NIP\A/HF \A/Atlanrl Nvr'Irnlnav F-1 Drc Dh,.,h-,+a r'n.r, r,o n,r Ins
?018 Update August 2019
LEGEN
MODIFIED ALT L PERMIT BOUNDARY
NON—RIVERINE WET HARDWOOD FOREST
AREAS 135A AND 58A AVOIDED BY
S , PERMITTED MOD ALT L MINE BOUNDARY
4
Bonnerton
Non—Riverine Wet Hardwood Forest
® Areas Avoided by Mod Alt L
PCS PHOSPHATE MINE CONTINUATION
SOURCE: Scale: As shown Drawn by: TLJ
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2018 Update August 2019
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SOIL SURVEY OF BEAUFORT COUNTY, NORTH CAROLNA, US DEPARTMENT
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SYMBOL SOIL NAME
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PCS PHOSPHATE MINE CONTINUATION
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Figure 10. 2015 —2018 hydrology during deep well pump operations. Four Level TROLLS were in proximity to the deep wells during the time the pump was in operation; horizontal bars at top right of graphs depict the period of pump
operation.
Bonnerton NRWHF Wetland Hydrology
2018 Update
F-10
PCS Phosphate Company, Inc.
August 2019
Table 1. Monthly and annual rainfall for 2018, 2017, 2016, and 2015 recorded at the Porter Creek rain gauge and at the PCS Aurora 6N station.
MONTH
2O18 RAINFALL (INCHES)
2017 RAINFALL (INCHES)
2016 RAINFALL (INCHES)
2015 RAINFALL (INCHES)
Porter Creek
PCS Aurora 6N
Porter Creek
PCS Aurora 6N
Porter Creek
PCS Aurora 6N
Porter Creek
PCS Aurora 6N
January
4.55
4.82
3.96
2.68
2.93
3.77
3.95
4.29
February
1.36
0.96
1.35
1.33
5.83
6.80
4.43
4.88
March
4.92
5.06
4.71
3.90
3.20
4.39
3.46
3.53
April
5.82
5.41
5.45
4.72
1.79
2.29
2.50
2.92
May
8.75
6.62
4.82
3.56
3.58
5.15
4.39
4.32
June
8.17
6.92
3.62
3.80
6.22
5.43
8.86
8.44
July
7.59
5.59
5.56
5.81
6.63
5.73
5.65
5.57
August
4.59
3.96
5.93
6.47
3.79
4.00
2.74
2.74
September
8.11
7.30
5.24
3.77
8.27
9.49
6.61
6.61
October
1.84
2.41
2.82
1.23
9.20
8.11
5.70
5.96
November
4.83
6.20
1.43
1.42
0.99
1.05
5.63
8.72
December
7.08
6.78
4.01
2.52
3.50
3.71
5.04
5.04
TOTAL
67.61
62.03
48.09
41.21
55.93
59.92
58.96
63.02
Table 2. Drought conditions for the south side of Pamlico River in the vicinity of South Creek for the years 2012-2018.
The drought conditions for each week were provided by the US Drought Monitor.
No drought
Abnormally
Moderately
Severe
Extreme
Exceptional
percent of weeks
Year
status
dry(DO)
dry(D1)
drought(D2)
drought(D3)
drought(D4)
with a drought
classification
2012
28
4
20
0
0
0
46
2013
39
13
0
0
0
0
25
2014
45
52
7
0
0
0
0
0
0
0
0
0
13
0
2015
2016
49
3
0
0
0
0
6
2017
47
5
0
0
0
0
10
2018
51
1
1 0
1 0
0
0
2
Bonnerton NRWHF Wetland Hydrology T-1 PCS Phosphate Company, Inc.
2018 Update August 2019
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Table 5. Operation dates for the pumps within deep water wells in the Bonnerton Tract as of the
end of 2018; well locations are shown on Figure 9. Bold indicates earliest on date and latest off
date of the pumps for the deep wells used in analysis (*). These three deep wells were in closest
proximity to the LeveITROLLs in Bonnerton non-riverine hardwood forest and were no longer in
operation. Other dates show on/off dates for other deep wells in the Bonnerton Tract.
Deep Well Date Pump On Date Pump Off
DWI 108*
February 2017
October 2018
DWI 109*
February 2017
October 2018
DWI 110*
February 2017
October 2018
DW1111
August 2017
September 2018
April 2019
Still on
DWI 112
October 2017
Still on
DWI 113
October 2017
Still on
DWI 114
December 2017
February 2019
DWI 115
February 2018
March 2019
DWI 116
August 2018
April 2019
DWI 117
September 2018
Still on
DWI 118
September 2018
Still on
DWI 119
April 2019
Still on
DWI 120
May 2019
Still on
DWI 121
May 2019
Still on
Bonnerton NRWHF Wetland Hydrology T-6 PCS Phosphate Company, Inc.
2018 Update August 2019
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APPENDIX A
Soil Profile Descriptions at Bonnerton NRWHF and Upper Porter
Creek Monitoring Wells
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APPENDIX B
2017, 2016, and 2015 Wetland Hydroperiods for Bonnerton
NRWHF and Upper Porter Creek Monitoring Wells
Table B-la. 2017, 2016 and 2015 wetland hydroperiods for Bonnerton NRWHF and upper Porter Creek monitoring wells during WETS normal and below normal
rainfall. Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall.
2017 GROWING SEASON
Well
Consecutive days
Wr-12"or above
Dates
Cumulative days of
wetland hytlroperiods
longest hydroperiod%
263-day growing season
Hydrologic zone of longest hydroperiod
767>_632.5% >32.5-2596 >2575%
BHW2
48
2/284/16
50
17.0
X
BNW2
53
_
2/28-4/21
53
188
18,
%
BHW3
48
2/28-4/16
50
ITO
X
8HW4
48
_ 2/28-4/16
51
17.0
X
BHWS
55
2/28-4/23
65
19.5
_
X
BHW6
;17; 28
554/23;5/266/30;
2/28- 8/29-9/25
_
111
19.5
X
_
BHW]
55; 17; 33
2/28-4/23; 5/25-6/30; 8/29-9/28
130
19.5
%
_
BHWB
55; 31
2/2"/23; 8/29-9/28
102
19.5
_
-x-
BHW9
55
2/28-4/23
63
19.5
X
BHW10
55
2/284/23
56
19.5
_
X
BHW31
55
2/284/23
63
19.5
X
BHW32
53
2/28-4/21
54
18.8
X
BHW33
55
2/28-4/23
54
19.5
%
BHW14
52
2/28-4/20
52
18.4
%
- -
PC1
45
2/28:4/13
46
16.0
X
PC2
47
2/284/15
49
167
X
PC3
46
2/28-4/14
46
16.3
X
PC4
52
_ 2/28-4/20
52
184
%
PC5
53
_ 2/28-4/21
53
18.8
X
PC6
53
2/28-4/21
53
18.8
X
_
2016 GROWING SEASON
Well
Consecutive days
Wr-12"or above
Dales
Cumulative days of
wedandhydroperiods
longest hydroperiod%
283-daygrowing season
Hydrologic zone of longest hydroperiod
16% >_6-12.5% >12.5-25% 125-75%
BHW3
04
3/"/19
44
25.5
It
BHW2
46
3/6-4/21
46
16.3
X
BHW3
45
3/6-4/20
BHW4
45
3/6-4/20
45
15.9
X
BHWS
80
3/65/24
80
28.3
X
BNW6
82
3/65/26
82
29.0
X
_ BHW2
80
3/6-5/24
80
28.3
X
BHWB
44; 18
3/6-4/19;5/3-5/20
62
15.5
X
BHW9
80
3/6-5/24
80
28.3
X
BHW1U
72
3/6-5/16
R
25.4
X -'
BHW31
82
3/6-5/26
82
29.0
x
BHW12
46
3/6-4/21
_
46
16.3
x
BHW13
51; 14
3/6-4/26; 5/3 5/16
65
18.0
X
BHW14
51
3/6-4/26
51
18.0
X
PC1
35
3/6-4/9
35
12.4
%
PC2
44
3/64/19
44
15.5
X
PC
42
3/6-4/17
42
14.9
X
_ PC4
44
3/6-4/19 _
_ 44
15.5
_ _
x
PC5
46
3/6-4/21
46
_
36.3
x
PC6
44
3/6-4/19 1
44
_
15.5
X
2015 GROWING SEASON (BMW wells not installed until June/July)
Well
Consecutive days
AT 12"or above
Dates
Cumulative days of
wetland hydroperiods
longest hydroperiod%
282-day growing season
Hydrologic zone of longest hydroperiod
a6% >_6-12.5% >32.5-25% 125J5%
BHW3
0
None_
0
0.0
X
BHW2
0
None
0
0.0
%
BHW3
17
11/331/19
17
%
BHW4
0
_ None
0
_6.0
BHWS
18
_
_ 11/2-11/19
18
_
6 .4
X
BHW6
16; 18
7/12-7/2T,11/2-11/19
34
64
X
BHW]
18
11/2-11/19
16
6.4
%
BHWB
15; 18
7/12 7/26; 11/2-11/19
33
i
X
BHW9
16
11/4-11/19
_
16
SJ
X
BHW10
17
11/3-11/19
17
6.0
X
__BHW33
15;18
_
]/124/26; 11/2-11/19
_ 33
6A
X
BHW32
17
il/3-ll/19
_
17
6.0
X
BHW33
17
11/3-11/19
ll
6.0
x
BHW14
17
_ 11_/3-11/19
17
6.0
X
_
PCl
65;17
2/28-5/3; 11/3-11/19
82
23.0
X
PC2
65;D
2/28-5/3; 11/3-11/19
82
PC3
65;ll
_ 2/28-5/3; 11/3-11/19
82
23.0
%
PC4
67;15
_
2/285/5; I1/5-11/19
_
80
23.8
X
PC5
67j5
2/28-5/5; 11/541/19
_
80
_
PC6
69;17
2/28-5/7; 11/3-11/19 j86
24.5
_
X
Bonnerton NRWHF Wetland Hydrology Appendix B-2 PCS Phosphate Company, Inc.
2018 Update August 2019
Table B-lb. 2017, 2016 and 2015 wetland hydroperiods for Bonnerton NRWHF and upper Porter Creek monitoring wells independent of WETS thresholds.
Rainfall from NOAA station Aurora 6N used for long-term percentiles and to determine periods of normal rainfall.
2017 GROWING SEASON
Well
Consecutive days
Wr-12"or above
Dates
Cumulative days of
wetland hydroperiods
Longest hydroperiod%
283-day growing season
Hydrologic zone of longest hydroperiod
<6% >-6-12.5% >12.5-25% >25 75%
BHWI
48
2/28-4/16
60
17D
%
BHW2
53
2/28-4/21
69
18.8
17.0
17.0
%
BHW3
BHW4
49
48
2/28-4/16
2/28-4/16
_
65
67
%
%
BHW5
80
2/28-5/18
96
28.4
_ _
x
BHW6
9HW7
103,28
103; 31
_
2/28-6/10; 8/299/25
2/28-6/10;8/2M/28
14S
164
36.5
x
36.5
x
BHW8
79; 31
2/28-5/17; 8/29-928
133
28.0
If
BHW9
79
2/28-5/17
93
28.0
%
BHW30
65
2/28-5/3
83
23.0
x
BHW31
81
2/28-5/19
96
28.7
x
BHW32
53
2/28-4/21
75
19.8
%
8HW33
65
_
2/28-5/3
79
23.0
%
BHW14
52
2/28-4/20
_
73
18.4
%
PC3
45
2/28-0/13
51
16.0
%
PC2
47
2/28 4/15
57
16.7
_
PC3
46
2/28-0/14
53
16.3
_
_%
x
PC4
52
2/284/20
67
18A
%
PC5
53
_
2/284/21
IRA
%
PCs
53
2/28A/21
_69
69
18.8
%
2016 GROWING SEASON
Well
Consecutive days
Wr-12"or above
Dates
Cumulative days of
wetland hydroperiods
Longest hydroperiod%
283-day growing season
Hydrologic zone of longest hydroperiod
<6% a6-12.5% >32.5-25% >25-05%
BHWI
52
2/284/19
52
18.4
x
BHW2
54
2/28-4/21
54
19.1
x
BHW3
53; 29
2/28-4/20; 9/20-10/lB
_ _
82
18.8
%
BHW4
53
2/28-4/20
53
18.8
%
BHW5
87,18, 48
2/28-5/24; 5/29-6/15; 9/20-11/6
153
_
30.7
x
BHW6
89; 25; 56
2/28-5/26; 5/29-6/22; 9/12-11/6 _
2/28-5/24; 5/29-6/16; 9/20-11/6
2/28-4/19; 5/3 5/19; 5/29 6/14; 9/12-10/30
2/_28 5/24; 5/29-6/14, 9/12-10/29
2/28-5/16; 5/29-6/13; 9/12-10/25
170
31.4
%
BHW7
87; 19; 48
154
30.7
x
BHW8
52;17;17;49
135
18.4
x
BHW9
BHWIO
_ 87; _17; 48
79; 16; 44
152
170
30.7
%
x
27.9
BHW ll
99; 25; 56
2/28-5/26; 5/29-6/23; 9/12-11/6
170
31.4
x
_BHW32
BHW 13
54; 14; 33
59; 14;14; 42
2/28-4/21; 5/30-6/12; 9/20-10/22
2/28-4/26; 5/3-5/16; 5131-6/13; 9/12-10/23
101
129
19.1
20.8
x
x
BHW14
59; 15; 41
2/29-4/26; 5/29-6/12; 9/12-10/22
115
20.8
x
PCI
42
2/28-4/9
2/28-4/19; 9/30-10/17
42
70
14.8
18.4
x
x
PC2
52; 18
PC3
50
2/28-4/17
50
17.7
PC4
PC5
52; 17
_
2/28-4/19; 9/30-10/16
2/28-4/21; 9/20-10/19
69
73
18.4
19.1
x
x
54; 29
PCs
52; 28
2/28-4/19; 9/20-10/17
80
18.4
x
2015 GROWING SEASON (BH W wells not installed until June/July)
Well
Consecutive days
WI-12" or above
Dales
Cumulative days of
wetland hydroperiods
Longest hydroperiod It
282-day growing season
Hydrologic zone of longest hydroperiod
<6%
>_6-125%
>32.5-25%
>25-75%
BHWI
17
11/20-12/6
17
6.1
It
BHW2
18
11/19-12/6
18
6.4
%
BHW3
15; 34
10/2-10/16; 11/3-12/6
49
12.1
%
_
BHW4
18
11/19-1216
18
6.4
x
BHW5
25; 35
10/1-10/25; 11/2-12/6
60 _ _
12.4
%
BHW6
16; 67
7/12-7/27; 10/1-12/6
_
83
23.8
x
BHW7
25; 35
10/1-10/25; 11/2-12/6
60
_
12A
%
BHW8
15; 35
7/12-7/26; 11/2-12/6
50
12.4
%
BHW9
15; 33
_
10/1-10115; 11/4-12/6
48
11.7
%
BHW30
16; 34
10/2-10/17; 11/3-12/6
_
47
12.1
%
BHWII
15; 25; 35
7/1_2-7/26; 10/2-10/26; 1112-12/6
_ _
75
%
BHW32
15; 34
10/2-10/16; 11/3-12/6
10121G/17;11/31216
10/2-10/16; 11/3-12/6
49
_12.4
12.1
x
BHW33
16; 34
50
12.1
%
BHW14
15; 34
49
12.1
x
65;16;34
2/28-5/3;10/1-10/16;11/3-12/6
115
23.0
x
_PCI
PC2
65114117;34
2/28-5/3;6/3-6/16;10/1-30/17;11/3-12/6
130
23.0
x
PC3
t 65;16;34
2/28-5/3;30/1-10/16;11/3-12/6
115
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132
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1 2/28-5/7;6/3-6/18;10/1-10/18;11/3-12/6
_
137
24.5
x
Bonnerton NRWHF Wetland Hydrology Appendix B-3 PCS Phosphate Company, Inc.
2018 Update August 2019
APPENDIX C
January— December 2018 Hydrology Graphs
NOTE: water levels greater than —30 inches below the ground surface exceed the length of the
well casing for the shallow hydrology LevelTROLL monitors. Periods of horizontal water level
shown on the hydrology graphs indicate the actual water level is deeper than that horizontal
value.
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