20071012 Ver 1_Bay City Farm Mitigation Site Closeout Request_20170825

PotashC®rpa
Helping Nature Provide
Hand Delivered
August 24, 2017
Mr. Tom Steffens
U.S. Army Corps of Engineers
Washington Regulatory Field Office
2407 West 5a' Street
Washington, North Carolina 27889
Mr. Anthony Scarbraugh
NC Division of Water Resources
Department of Environmental Quality
943 Washington Square mall
Washington, North Carolina, 27889
Dear Mr. Steffens and Mr. Scarbraugh:
PotashCorp - Aurora
RECff1V60114CpE1V;MwR
AUG 25 2017
rsNOno Aeglonat
Washington p Section
agionai oMO9
The Bay City Farm mitigation site south of Aurora NC, approved for mitigation under a
404 permit issued to PCS Phosphate on June 10, 2009 (Action ID 200110096), and 401
Water Quality Certification DWQ #2008-0868, version 2.0 (January 15, 2009), has been
verbally "signed off' as successful by the Corps of Engineers and the NC Division of
Water Resources. Attached is our determination of wetland, stream and buffer mitigation
credits for the site based on the 5 -year monitoring program and the mitigation ratios
specified in the 404 permit. Also attached is the mitigation ledger as of 8/24/17, as
required by Condition N of the 404 permit, updated to incorporate the Bay City Farm
wetland, stream and buffer mitigation credits shown in the attached credit calculations. I
am now requesting written approval of the successful completion of the mitigation site
and the attached credit calculations.
I will explain the ** footnote at the bottom of the mitigation ledger table which references
mitigation linear feet needed after adjustments to stream quality (1:1 for poor/fair, 2:1 for
good, and 3:1 for excellent). During the Environmental Impact Statement process, CZR
Incorporated biologists utilized the Corps and DWR (DWQ) stream rating forms and
scored stream segments along every intermittent and perennial stream on the NCPC,
Bonnerton and South of 33 tracts, and determined the linear foot lengths of each of the
segments. The rating scores were used in conjunction with field observations of physical
stream features (channelized, incised, natural, channel poorly defined, etc.), to divide
stream segments into the poor/fair, good and excellent categories. The linear foot lengths
for each segment were then multiplied by the corresponding ratio to determine the linear
feet of impacts that were required to be mitigated for.
1530 NC Hwy 306 South, Aurora, NC USA 27806 T [phone]
PotashCorp. i www.potaskorp.com

Attached is the table developed by CZR that shows (among other things), the breakdown
of lengths of poor, good, and excellent perennial and intermittent stream segments
impacted in each 2 -year impact block. These lengths were then multiplied by either 1:1,
2:1 or 3:1 to determine the Stream Impact numbers in the mitigation ledger table.
If you have any questions, please call me at [phone], or e-mail me at
jfurnessna notashcoro.com.
CSincerely,
V"'U4 —'
Jeffrey C. Furness
Senior Scientist
Attachments
PC: Mac Haupt, NCDWR – Raleigh w/attach (Fed Ex)
S. Cooper/J. Berger, CZR Incorporated - w/attach (Fed Ex)
23-16-006 – w/attach

MITIGATION CREDIT CALCULATIONS FOR BAY CITY FARM MITIGATION SITE
(Based on Combined 2013 and 2014 Annual Report for the Bay City Farm Restoration Site (Sixth and
Seventh Years) and Monitoring Summary, by CZR Incorporated, dated October 2015, (refer to this
report for data)
WETLAND (See enclosed Credit Figure for depiction of areas of types of mitigation).
Vegetation: Overall Site 331 tpa of planted trees after 5 years
Hydrology:
• Nonriparian restoration: 48 of 50 wells > 6.0% hydrology over 4 normal or below normal
years. The two wells <6.0% were intentionally located to measure the drainage effect of
the roadside ditch along SR 1002. This width and acreage has been pulled out of the
success area. Bay City Farm 501.66 acres @ 2:1= 250.83 credits plus Hollowell 5.92
acres @2:1= 2.96 credits. 250.83 + 2.96 = 253.79 credits.
• Riparian restoration: 10 of 10 wells > 8.2% hydrology over 5 normal or below normal
years, with 8 of 10 > 12.5% over 5 years. Bay City Farm Headwater Stream Valley 32.29
acres @ 2:1 = 16.15 credits.
• Wetland enhancement: Northeast corner of Hollowell former agricultural field 3.30
acres @ 3:1= 1.10 credits, and Hollowell headwater stream valley 3.63 acres @ 3:1 =
1.21 credits. 1.10 + 1.21= 2.31 credits.
• Wetland preservation: Bay City Farm 49.10 acres @ 8:1 = 6.14 credits, plus Hollowell
48.61 acres @ 8:1= 6.08 credits. 6.14 + 6.08 =12.22 credits.
TOTAL WETLAND CREDITS: 284.47 (Note that wetland mitigation requirements in the 404
permit and the 401 WQC were only for total wetlands, and did not require separate accounting
for riparian vs. nonriparian wetlands).
STREAM (See enclosed Credit Figure for depiction of observed flow lengths).
• Coastal Plain Headwater Stream Restoration
1. Bay City Farm: 4,084 I.f. @ 1:1 = 4,084 credits.
2. Hollowell: 517 I.f. @ 1:1 = 517 credits
TOTAL STREAM CREDITS: 4,601

BUFFER (See enclosed Credit Figure for depiction of areas of buffer mitigation).
Vegetation: Five tree plots within 0-200 feet from valley edge, including planted stems and
woody native volunteers average 1,068 tpa after 5 years.
• 0-100 foot buffer restoration within Bay City Farm 18.84 acres @ 1:1= 18.84 credits
• 0-100 foot buffer restoration within Hollowell 2.25 acres @ 1:1= 2.25 credits
• 100-200 foot buffer restoration within Bay City Farm 19.70 acres @ 2:1= 9.85 credits
• 100-200 foot buffer restoration within Hollowell 2.25 acres @ 2:1= 1.13 credits
• 0-100 foot buffer preservation along Gum Swamp Run within BCF 1.92 acres @ 10:1= 0.2
credits
• 0-100 foot buffer preservation along Gum Swamp Run within Hollowell 1.73 acres @
10:1= 0.2 credits
• 100-200 foot buffer preservation along Gum Swamp Run within BCF 1.90 acres @ 10:1=
0.2 credits
• 100-200 foot buffer preservation along Gum Swamp Run within Hollowell 1.71 acres @
10:1= 0.2 credits
TOTAL BUFFER CREDITS: 32.87

COMBINED 2013 AND 2014 ANNUAL REPORT FOR THE
BAY CITY FARM RESTORATION SITE
(SIXTH AND SEVENTH YEARS)
AND MONITORING SUMMARY
RICHLAND TOWNSHIP
BEAUFORT COUNTY, NORTH CAROLINA
Prepared for:
PCS Phosphate Company, Inc.
Prepared by:
CZR Incorporated
October 2015

1 _?AURORA c
\
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b9.
t HOLLOWELL TRACT - - -
46L ryP A
- UT 3$ OS 21.74020 h_ ` 1
- LONG BY 03'§72 [ -^
BAY CITY FARM - -
- - - YITIGAiIOX SITE
\
o 4,000 8,000
ZNORZTHCAROLINA
SCALE IN FEET
SITE LOCATION - BAY CITY FARM BAY CITY FARM HOLLOWELL
VICINITY MAP
LEGEN PCS PHOSPHATE COMPANY, INC.
BAY CITY MITIGATION BOUNDARY
BAY CITY FARM/HOLLOWELL BOUNDARY SCALE: AS SHOWN APPROVED BY: DRAWN BY: BFG/TLJ
— - - —
DATE: 01/14/13 FILE: BCF -LOC -RPT -2012
CP#1 745.59.19
SOURCE KRTA ION. GS TOED BY: NORM Cl OB. NO VA EM 4709 COLLEGE ACRES DRIVE
OF 33 FEET. 1:240. -SC TOFCGW 01 WP 13.90 A NO $1AiPVNE. SUITE 2
WDBJ. FEET. 1:24000 -SCALE. USCSfOPOTtE1t3.AD AND USLSfOPO111E140.4D.
USGS OpAONNGLES AURORA SOUTH GREEN, BAYBORO AND VENDEHERE WILMINGTON. NORTH CAROLINA 28403
Wmm MWANCOOT02C 9m.ORFORAT ED TEL [phone] FIGURE 1
[RAID 901!4 [pBAYIIRf F. 910/S92-9139
Fig -1

1.0 INTRODUCTION
1.1 History.
The main restoration earthwork at Bay City Farm occurred between August 2007
and March 2008. These mitigation activities were permitted under US Army Corps of
Engineers (Corps) Nationwide Permit 27 dated 27 July 2007 (Action ID No. SAW -2007-
01848), NC Division of Water Quality 401 Water Quality Certification dated 24 July 2007
(Project # 07-1012 and as modified by # 2008-0868) (copies of these materials are in
Supporting Document A of the Bay City As -Built Report, CZR 2009a), and Division of
Land Resources Erosion and Sediment Control Plan dated 27 August 2007 (Beauf-
2008-007). Additional remedial earthwork to reduce elevations of linear hummocks
occurred during August and September 2008. All earthwork was performed by Sawyer's
Land Developing, Inc. under the supervision of PCS Phosphate Company Inc. (PCS),
Jonathan T. Ricketts, Inc., the design engineer, and CZR Incorporated (CZR), the
environmental consultants. This mitigation site is proposed as part of compensatory
mitigation for impacts to wetlands associated with the PCS mine continuation authorized
by Corps Action ID No. SAW -2001-10096. The site is monitored by CZR.
1.2 Location.
The Bay City Farm project site is owned by PCS and is located on the west side
of Bay City Road (SR 1002) approximately 4 miles south of the Town of Aurora,
Richland Township, Beaufort County, North Carolina and occurs on the USGS Bayboro
quadrangle (Figure 1). The approximate center of the site lies at latitude +35.241158
and longitude -76.787764 (35.14.25 degrees north, 76.46.41 degrees west). The
mitigation site is comprised of the 72 -acre Hollowell Tract (forested portion on the north
side of the property) and the 640 -acre Bay City Tract (prior converted agricultural fields
and a forested wetland north and northeast of the concrete pads). The western
boundary of the Hollowell portion of the site borders the east side of South Creek, and
Gum Swamp Run drains through the northeast corner of both parcels to South Creek.
The site is located within the South Creek subbasin of the Pamlico Hydrologic Unit
03020104 in the Tar -Pamlico River Basin.
1.3 Goals of the Project.
As estimated in the 2008 PCS Final Environmental Impact Statement (FEIS)
mitigation plan (US Army Corps of Engineers 2008a, Volume III- Appendix 1), the
purpose of restoration activities at Bay City Farm is to successfully restore
approximately:
529 acres of non -riparian wet hardwood flat,
25 acres of riparian wetland,
3,000 linear feet of riparian coastal headwater valley stream system,
11 acres of existing wooded parcel,
7 acres of riparian buffer,
and preserve approximately:
12 acres of riparian wetland (preservation/enhancement) and
107 acres of wetland hardwood forest.
Bay City Farm Mitigation Site 1 PCS Phosphate Company, Inc.
2013 and 2014 Annual Monitoring Report October 2015

2
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TY MITIGATION AREA
PS 5
DETAIL A
0 800 1.800
---------------
SCALE IN FEET
LEGEND
BAY CITY MITIGATION SITE
®
SOUTH CREEK CORRIDOR EXISTING
WETLANDS
®
BAY CITY FARM/HOLLOWELL EXISTING
WETLANDS
O
UPLAND (DRAINED OR FILLED WETLAND)
AREAS PLANTED:
ZONE 1 — TREES IN THE LOWEST
CONTOURS
®
ZONE 1A — SHRUB IN THE LOWEST
CONTOURS
[
ZONE 2 — TREES
15
ZONE 2A — SHRUBS
O
ZONE 3 — TREES
l
ZONE 3A — SHRUBS
O
ZONE 4 — TREES IN THE HIGHEST
CONTOURS
®
ZONE 4A — SHRUBS IN THE HIGHEST
CONTOURS
•
ELECTRONIC WELL
QM
MANUAL WELL
m
TREE SAMPLING PLOT
BCW -35
WELL NUMBER (BAY CITY FARM)
H-5
WELL NUMBER (HOLLOWELL TRACT)
F-1
WELL NUMBER (FORESTED TRACT)
S-1
WELL NUMBER (STREAM ARRAY)
PSI
PHOTO STATION NUMBER
•
PHOTO STATION
RAIN GAUGE
■
FLOW STATION
BCF -1 FLOW STATION NUMBER (BAY CITY FARM)
HF -5 FLOW STATION NUMBER (HOLLOWELL TRACT)
BAY CITY MITIGATION SITE
MONITORING LOCATIONS
PCS PHOSPHATE COMPANY
SCALE: AS SHOWN APPROVED BY: DRAWN BY: TLJ
DATE: 10/07/15 FILE: ZOFaMor9_aHoro.
{]OB COLIECE ACRES
SUM2 CP#1745.59.19
IE 3
Am�ORYOR AT EO WIWTEL 9110%382 NC �9,3 FIGURE 2
ommwortR� mmRiuns To 910/992-9139
Fig -2

SOURCE
AS BUILT UDAR PROVIDED W.
JONATHAN RICKETS ENGINEERING.
34W NORTHW(E BLVD., PAUL BEACH
GAROENS, RORIDA, PHONE 561 630_6700
DATED: MAY 14, 2010
LEGEND
Bay City Farm Mitigation Site (712.11 acres)
Restored Coastal Plain Headwater Stream at 1:1
Bay City Farm 4,084 If
Hollowell 517 If
Total Stream Credits = 4,601 If
® 100 Foot Buffer Restored within Bay City Form (18.84 acres)
(0-100 Foot Buffer Credits at 1:1 = 18.84)
® 100 Foot Buffer Restored within Hollowell (2.25 acres)
(0-100 Foot Buffer Credits at 1:1 = 2.25)
® 200 Foot Buffer Restored within Bay City Form (19.70 acres)
(101-200 Foot Buffer Credits at 2:1 = 9.85)
® 200 Foot Buffer Restored within Hollowell (2.25 acres)
(101-200 Foot Buffer Credits at 2:1 = 1.13)
100 Foot Buffer Preserved along Gum Swamp Run
within Bay City Farm (1.92 acres)
(101-200 Foot Buffer Credit at 10:1 = 0.2)
® 200 Foot Buffer Preserved along Gum Swamp Run
within Bay City Farm (1.90 acres)
(101-200 Foot Buffer Credit at 10:1 = 0.2)
i 100 Foot Buffer Preserved along Gum Swamp Run
within Hollowell (1.73 acres)
(101-200 Foot Buffer Credit at 10:1 = 0.2)
i
i 200 Foot Buffer Preserved along Gum Swamp Run
within Hollowell (1.71 acres)
(101-200 Foot Buffer Credit at 10:1 = 0.2)
Total buffer Credits = 32.87
Restored Wetlond at 2:1
Bay City Farm (501.66 acres = 250.83 Credits)
Bay City Headwater Stream Valley (32.29 acres = 16.15 Credits)
Hollqwell (5.92 acres = 2.96 Credits)
(Credits = 269.94)
Enhanced Wetland at 3:1
Hollowell (3.30 acres =1.10 Credits)
Hollowell Headwater Stream Valley (3.63 acres = 1.21 Credits)
(Credits = 2.31)
Preserved Wetland at 8:1
Bay City Farm (49.10 acres = 6.14 Credits)
Hollowell (48.61 acres = 6.01 Credits)
(Credits = 12.22)
Total Wetland Credits = 284.47
Upland (Drained or Filled Wetland)
Bay City Farm (14.25 acres)
Hollowell (3.05 acres)
0 800 1.800
SCALE IN FEET

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PERENNIAL(1B) L.F. INTERMITUONT(1C) L.F.
EF
U
HUDDLES CUT 2574
dNCCBS
UT4 00
TOOLEY CREEK 0 687
.i-
JACOBS CREEK 0 662
SUP
p\�
os""' TOTAL L.F. 0 3981
2p�6�2
IMPACTS OUTSIDE NCPC MODIFIED ALT L BOUNDARY
ucac uaani0 ALT L - sNunxc AH0 P11 CS -
N f.. XMNM<Y Ll6 RRIMF [X11MHG A1111 I.—
IA PU6UC TRUST NtE/5 b L.F. (0.02 ACRES)
EEY.
NCPC Yd161m AIT 1 - NC HKMAY ]08
.1NGµ5 Oft
to PFRFNNNL 51REW1(G\NAL)RELOCATON 220 LF. (0.18 ACRES)
Syg\Lµ
GREE
2p�6, z
2 YEAR IMPACT PERENNIAL INIERMfDENT
BLOCK6 (1 B) (1C) TOTAL LF.
zo o o zZ � ziia
-2D11
zolz-ems o sa] sa]
zou-zm6 0 662 fifiz
2016-2017
C0.µ
,1N\\SL�U0.5t
Modi11 d Allem IvePL� NCPC
PCS PHOSPHATE MINE CONTINUATION
0 1600
3200 Seale: Aa shown Drawn b : BFG TLJ
Date: 11 20 09 r........i
A roved
0
0
0
TOTAL Li.
0
3981
3881

INlEN41LRN1 - 126 L r
X F1010
18 - 101TL Lr
1..
- vwa rom LF
163 L r
un Lr.
822 Lr 15B Lr
123 LF
2020-2021 61 Lr
1056 LI
"all B2 LF
128 L r
mm PRpIG M
� YNY
2016-207
10 - 11,. Ornl TOTAL a 2016-207
033-3033
0 1.600 1,200
]66 L F
296 L F
13 LF
161 L F
2R4 -M23 PERENNM(1B) LF. TOTAL L.F.
206 IOr.LL L F
PORTER CREEK 2.533
TOTAL L.F.
INIERMMEW(1C) L.F. 4,786
PORTER CREEK (2.356)
DURt1AM CREEK (2,430)
St.. Impact LF
Modlfled Alt6rnativa L — Benn.d6n
PCS PHOSPHATE MINE CONTINUATION
SaDate: 11/20/09
Approved by:
As Shown Drawn by: BFG TLJ
2 YEAR IMPACT PERENNNL IMERMOTENi
BLOCKS (18) (1C) TOTAL L.F.
2016-201]
1]65
1]8
1913
2018-2019
788
2304
30]2
202D-2021
0
0
0
2022-2023
0
2100
2100
zoza—zOzs
a
zoa
zoo
TOTAL LF.
2533
47Bfi
]319