20080868 Ver 2_Section I C Drainage Basins 2021 PCS Creeks Report_20220605

C. Cumulative and 2021 Mining, Mine -related Activities, and Drainage Basins
Progress of the mine advance through 9 January 2022 is shown on an aerial photograph
in Figure I-C1 along with the approximate historic drainage basins and Alt E and Mod Alt L permit
boundaries north of NC Highway 33 (Figure I-C1). Although the focus of the Corps 404 permit
and the State 401 certification is associated with Mod Alt L permitted impacts, percent basin
reductions are presented for several periods of reference (i.e., pre Alt E, post Alt E/pre Mod Alt L,
and post Mod Alt L). Drainage basin alterations of monitored creeks are depicted on a LiDAR
base map (Figure I-C2) and in Table I-C1. Drainage basin acreages and reductions have been
estimated using these data.
While mine activities continued in the southern portion of the Bonnerton Tract through
2021, no additional reduction of basins occurred for creeks subject to detailed monitoring with this
study; therefore, the acreages and percent reductions have not changed from the 2018 report.
The last year of creek study basin reductions due to Mod Alt L were: 2011 for Huddles Cut, 2013
for Tooley Creek, 2014 for Drinkwater Creek, 2015 for Jacobs Creek and Jacks Creek, 2017 for
Porter Creek, and 2018 for DCUT11. No additional Mod Alt L reductions will occur to study creeks
in the NCPC or Bonnerton tracts.
Durham Creek is not a creek identified in the study plan for multiple parameter data
collection; however, salinity and water depth are collected at one site approximately 2,500 feet
downstream from the mouth of DCUT11 (Figure I-B15). Basin reductions in 2021 occurred within
the Bonnerton Tract south of the Porter Creek drainage basin; and resulted in impacts to
approximately 242 acres (198 in Durham Creek and 44 in Whitehurst Creek).
I-C-1

AERIALS PROVIDED BY: PCS PHOSPHATE COMPANY. INC.
1530 NC HIGHWAY 306 SOUTH. AURORA, NORTH
CAROUNA 27E106, 252-322-5121, DATE: JANUARY 09, 2022
Figure I-C1. Mine continuation through 2021.
I-C-2

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- 2021 Mine Advance Line
ESTIMATED PRE-ALT E CREEK STUDY DRAINAGE BASINS
MOD ALT L BOUNDARIES
AREAS IMPACTED BY ALT E WITHIN CREEK STUDY BASINS
AREAS IMPACTED BY MOD ALT L WITHIN CREEK STUDY BASINS THROUGH 2021
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I-C-3

Table I-C1. Estimated historic and current drainage basin of each control and impact creek in the study
as described in CZR 2011 (PA2, Little Creek, Long Creek, Duck Creek, and DCUT19), in CZR 2017
(SCUT1 and Broomfield Swamp Creek), and in previous annual creeks reports (Jacks, Jacobs,
Drinkwater, Tooley, and Porter creeks, Huddles Cut, and DCUT11). Permitted impacts to all NCPC
creeks north of Highway 306 have been completed; after permitted impacts are completed in the
Bonnerton Tract, the mine will move into the South 33 Tract and Broomfield Swamp Creek will have
permitted basin reductions. (Estimate sources: USGS topoquads, LiDAR, USGS stream stats
https://streamstatus. usgs.gov/ss/)
Control creek
Drainage basin
Basin land use
Historic (ac)
Current (ac)
Reduction (%)
SCUT1
-
1,965
0
Agriculture
Little Creek
1,822
1,722
5
Agriculture
Long Creek
630
223
65
Natural vegetation
PA2
-
22
0
Natural vegetation
Duck Creek
3,118
3,118
0
Silviculture; agriculture
DCUT19
121
121
0
Agriculture
Impact creek
Broomfield Swamp Creek
-
1,946
0
Agriculture
Jacks Creek
645
150
77
Natural vegetation
Jacobs Creek
751
202
73
Natural vegetation
Drinkwater Creek
605
153
75
Natural vegetation
Tooley Creek
563
257
54
Natural vegetation
Huddles Cut
1,014
289
71
Natural vegetation
Porter Creek
3,745
840
78
Natural vegetation
DCUT11
166
81
51
Natural vegetation
Note: Due to heavy agricultural use and flat topography, SCUT1 and Broomfield Swamp Creek historic
basins have not been estimated and are presumed to not be significantly different than what the USGS
stream stats web tool calculated; CZR biologists verified flow direction in all contributory ditches in both
basins in 2017. PA2 was excavated from uplands between Jacobs and Drinkwater creeks and therefore
had no historic basin. Muddy Creek (control) is monitored only for fish/benthos and sediment/water
column metals; its basin is amongst the largest of the creeks in the study and land use is predominantly
silviculture and agriculture. Durham Creek (control) is monitored only for depth and salinity at one
location, has the largest basin, and land use is mixed between natural vegetation, silviculture,
agriculture, and other human development.
I-C-4