20231194 Ver 1_More Info Received_20240524 (7)

Clean Water Act (CWA) Section 404 & 401 Application
Runway 5L/23R Replacement Project
Raleigh -Durham International Airport, Wake and Durham Counties, NC
MITIGATION PLAN
Updated April 2024
Clean Water Act (CWA) Section 404 & 401 Application — MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 1 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC

1. INTRODUCTION
The applicant proposes compensatory mitigation to offset unavoidable adverse impacts to wetlands, streams and other
aquatic resources authorized by Clean Water Act section 404 permit and section 401 water quality certification. This
proposed mitigation is consistent with 40 CFR part 230, Compensatory Mitigation for Losses of Aquatic Resources, Final Rule
(aka "2008 Mitigation Rule") and will satisfy the national goal of "no net loss" of wetland acreage and function.
2. METHOD TO PROVIDE COMPENSATORY MITIGATION
The 2008 Mitigation Rule allows for three mechanisms for providing compensatory mitigation. These include in order of
preference as established by the regulations: (1) mitigation banks, (2) in -lieu fee programs, and (3) permittee-responsible
mitigation. Mitigation banks with available credits do exist within the watershed, but do not have sufficient credits to cover all
the required mitigation for the project. The N.C. Division of Mitigation Services (DMS) in -lieu fee program has sufficient credits
to meet all the required mitigation for the project. As such, permittee-responsible mitigation is not the preferred option under
the regulations to satisfy the required mitigation. The applicant therefore proposes to purchase mitigation credits from
mitigation banks that have available credits. The applicant proposes to purchase mitigation credits from the DMS in -lieu fee
program to cover the balance of any required mitigation in which the mitigation banks do not have available credits.
Statement of Availability (SOA) letters are attached for mitigation banks that currently have mitigation credits available and
from the DMS in -lieu fee program.
3. SECTION 404/401 COMPENSATORY MITIGTION
a. MITIGATION RATIOS
The applicant will provide compensatory mitigation for the loss of all jurisdictional wetlands and streams as listed in the
tables provided in sections 3.b. and 3.c below. The applicant proposes to provide compensatory mitigation at a 2:1
ratio for the loss of all jurisdictional streams and wetlands except for those streams and wetlands that were specifically
classified using the N.C. Stream Assessment Method (NCSAM) and N.C. Wetlands Assessment Method (NCWAM) in
the jurisdictional determination request package as either "MEDIUM" or "LOW" quality. The applicant proposes to
provide a 1.5:1 mitigation ratio for the loss of jurisdictional streams and wetlands classified as "MEDIUM", and a 1:1
ratio for those classified as "LOW".
The applicant does not propose mitigation for temporary stream and wetland impacts that would not result in
a permanent loss. The applicant also does not propose compensatory mitigation for impacts (temporary or
permanent) to jurisdictional open waters (ponds).
Clean Water Act (CWA) Section 404 & 401 Application — MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 2 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC

b. JURISDICTIONAL STREAM MITIGATION
3
Number
3
Name
S20
(LF)
279.08
*
Ratio
2:1
(LF)
558.17
3
6
S45
83.56
*
2:1
167.11
3
8
S21
326.22
*
2:1
652.43
3
11
S22
95.23
*
2:1
190.46
3,4
13
S23
195.86
*
2:1
391.71
4
16c
S25
429.91
LOW
1:1
429.91
4,5
19b
S26
474.93
*
2:1
949.85
4,5
19c
S26
392.34
LOW
1:1
392.34
5,6
26c
S34
741.90
*
2:1
1,483.79
6
28c
S39
1,352.80
*
2:1
2,705.61
6
29
S35
200.94
*
2:1
401.87
6
30b
S37
418.37
LOW
1:1
418.37
7
33a
S41
47.13
*
2:1
94.26
7
33b
S41
53.30
*
2:1
106.60
7
33c
S41
554.09
LOW
1:1
217.51
7
34
S40
168.76
*
2:1
337.53
7
36a
S42
378.16
*
2:1
756.32
7
36b
S42
452.21
*
2:1
904.41
8
38
S43a
287.12
*
2:1
574.23
6
39
S46
23.60
LOW
1:1
23.60
Total Impact / Loss = 6,955.49
Total Mitigation = 11,756.10
Note: Streams exhibiting characteristics conducive to them receiving medium to high functional rating and/or mitigation values did not have a
NCSAM form completed for them and are represented by an asterisk (*).
Clean Water Act (CWA) Section 404 & 401 Application - MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 3 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC

c. JURISDICTIONAL WETLAND MITIGATION
rpac'
um berl
Impact
(Ac)
Ratio
(Ac)
3
2
W37
0.01
*
2:1
0.02
3
4
W36
0.21
*
2:1
0.42
3
7
W40
0.01
*
2:1
0.03
3
10
W39
0.20
*
2:1
0.41
3
12
W38
0.03
MEDIUM
1.5:1
0.04
3,4
14
W41
0.20
*
2:1
0.39
4
18
W59
0.10
MEDIUM
1.5:1
0.15
4
20b
W43
0.08
*
2:1
0.15
4
21
W42
0.12
MEDIUM
1.5:1
0.18
5,6
27
W49
0.05
*
2:1
0.09
718
37
W57
0.28
LOW
1:1
0.28
Total Impacts/Loss = 1.28
Total Mitigation = 2.16
Note: Wetlands exhibiting characteristics conducive to them receiving medium to high functional rating and/or mitigation values did not have a
NCSAM form completed for them and are represented by an asterisk (*).
4. ADDITIONAL REQUIRED MITIGATION
The following mitigation is required by regulations other than CWA Section 404 & 401.
a. NEUSE BUFFERS [SL2023-137 (H600)]
All Neuse River Basin Riparian Buffer (Neuse Buffer) impacts depicted in the application are covered under section
21.(c)(2) of Session Law 2023-137 House Bill 600 as "work in connection with an Airport Impacted Property" and as such
no Authorization Certificate is required from the N.C. Division of Water Resources. Mitigation will be provided as listed in
the table below for all "uses" that otherwise would be designated as "Allowable with Mitigation Upon Authorization" in
conformance with 15A NCAC 02B .0714 as required by the Session Law.
Clean Water Act (CWA) Section 404 & 401 Application — MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 4 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC

=Sheet
7Number
FN a Mme
ImpactImpac IrMnel
(sq.ft.)
Zone 2
..ctj
(sq.ft.)
4VV
"MitigaV
Required
ne 1
F
IV
(sq.ft.)
Zone 2
(sq.ft.)
iga
ig f
(lSqf
2
1a
Brier
Creek
Reservoir
3,937.88
2,617.63
6,555.52
(a)(iii)
Yes
11,813.65
3,926.45
15,740.10
2,3
1b
Brier
Creek
Reservoir
10,336.74
5,019.64
15,356.38
(a)(iii)
Yes
31,010.21
7,529.47
38,539.67
3
1C
Brier
Creek
Reservoir
1,500.91
1,000.34
2,501.25
(a)(iii)
Yes
4,502.73
1,500.51
6,003.24
3
3
S20
18,456.53
8,509.35
26,965.87
(a)(iii)
Yes
55,369.58
12,764.02
68,133.60
3
5
P4
43,566.11
30,923.47
74,489.57
(a)(iii)
Yes
130,698.32
46,385.20
177,083.52
3
6
S45
8,770.47
9,002.26
17,772.73
(a)(iii)
Yes
26,311.40
13,503.39
39,814.79
3
8
S21
17,034.35
10,503.23
27,537.23
(a)(iii)
Yes
51,103.05
15,754.85
66,857.9
3
9
P5
15,001.72
9,426.29
24,428.01
(a)(iii)
Yes
45,005.15
14,139.44
59,144.59
3,4
13
S23
9,472.96
5,639.73
15,112.69
(a)(iii)
Yes
28,418.88
8,459.59
36,878.48
3,4
14
W41
14,199.98
10,223.80
24,423.77
(a)(iii)
Yes
42,599.93
15,335.69
57,935.62
4
15
P6
1,545.42
1,029.07
2,574.49
(a)(iii)
Yes
4,636.27
1,543.60
6,179.88
4
16a
S25
4,480.62
2,432.04
6,912.66
(a)(iii)
Yes
13,441.86
3,648.06
17,089.92
4
16b
S25
29,726.44
22,972.31
52,698.76
(a)(iii)
Yes
89,179.33
34,458.47
123,637.80
4
17
P7
29,814.90
19,578.34
49,393.24
(a)(iii)
Yes
89,444.70
29,367.50
118,812.20
4
19d
S26
460.68
2,051.60
2,512.27
(a)(iii)
Yes
1,382.03
3,077.39
4,459.43
4,5
19b
S26
29,810.17
19,495.65
49,305.82
(a)(iii)
Yes
89,430.51
29,243.47
118,673.99
Clean Water Act (CWA) Section 404
Runway 5L/23R Replacement Projec
Raleigh -Durham International Airport.
& 401 Application — MITIGATION PLAN
Wake and Durham Counties, NC
Updated April 2024
Page 5 of 8

Sheet
4,5
Numbe
19c
Name
S26
ImpactImpac Zone 1
27,138.09
Zone 2
..ct
20,675.53
Total
Impact
47,813.61
Table
of
(a)(iii)
Mitigation
Required
Yes
Zone 1
Mitigation.Mitigation
81,414.26
Zone 2
31,013.29
Total
112,427.55
4,5
22
B6/W61
28,936.22
20,886.79
49,823.01
(a)(iii)
Yes
86,808.67
31,330.18
118,138.85
5
23a
S30
3,337.53
2,217.02
5,554.55
(pp)(i)
No
0.00
0.00
0.00
5
23b
S30
2,525.22
1,674.53
4,199.75
(kk)(i)
No
0.00
0.00
0.00
5
24a
SS30
3,522.40
2,287.44
5,809.85
(qq)(ii)
No
0.00
0.00
0.00
5
24b
SS30
2,635.29
1,810.46
4,445.75
(II)(i) /
(II)(iii)
Yes - Zone 1
No - Zone 2
7,905.87
0.00
7,905.87
5,6
26a
S34
4,153.87
3,423.68
7,577.54
(qq)(ii)
No
0.00
0.00
0.00
5,6
26b
S34
5,490.52
2,674.11
8,164.64
(II)(i) /
(II)(iii)
Yes - Zone 1
No - Zone 2
16,471.57
0.00
16,471.57
5,6
26c
S34
47,173.94
31,997.76
79,171.70
(a)(iii)
Yes
141,521.81
47,996.64
189,518.45
6
28a
S39
3,479.32
2,483.73
5,963.05
(qq)(ii)
No
0.00
0.00
0.00
6
28b
S39
3,531.56
1,855.51
5,387.08
(II)(i) /
(II)(iii)
Yes - Zone 1
No - Zone 2
10,594.68
0.00
10,594.68
6
28c
S39
82,350.86
51,070.20
133,421.06
(a)(iii)
Yes
247,052.59
76,605.30
323,657.89
6
30a
S37
0.00
236.88
236.88
(a)(iii)
Yes
0.00
355.32
355.32
6
30b
S37
28,741.23
20,943.38
49,684.61
(a)(iii)
Yes
86,223.69
31,415.07
117,638.76
6
SCM
B8/W62
49,652.71
33,840.08
83,492.79
(a)(iii)
Yes
148,958.14
50,760.12
199,718.26
7
31a
SS45
3,774.57
2,277.66
6,052.22
(pp)(i)
No
0.00
0.00
0.00
7
31b
SS45
2,562.02
1,890.34
4,452.37
(kk)(i)
No
0.00
0.00
0.00
7
33a
S41
3,381.96
2,371.42
5,753.38
(y)0i)
No
0.00
0.00
0.00
7
33b
S41
2,370.85
834.90
3,205.75
(a)(iii)
Yes
7,112.55
1,252.35
8,364.90
7
33c
S41
30,631.63
14,969.89
45,601.51
(a)(iii)
Yes
91,894.89
22,454.84
114,349.73
7,8
33d
S41
5,897.10
4,335.17
10,232.27
(a)(iii)
Yes
17,691.30
6,502.76
24,194.06
7
34
S40
9,006.00
6,626.05
15,632.05
(a)(iii)
Yes
27,018.00
9,939.07
36,957.08
7
35
SS49
2,081.19
2,439.27
4,520.47
(a)(iii)
Yes
6,243.58
3,658.91
91902.49
7
36a
S42
22,434.68
13,970.15
36,404.83
(x)
Yes
67,304.04
20,955.23
88,259.27
Clean Water Act (CWA) Section 404
Runway 5L/23R Replacement Projec
Raleigh -Durham International Airport.
& 401 Application - MITIGATION PLAN
Wake and Durham Counties, NC
Updated April 2024
Page 6 of 8

Table of Uses 15A NCAC 02B .0714(11):
(a)(iii) Airport facilities that impact greater than one-third of an acre of riparian buffer. (Allowable with Mitigation Upon Authorization)
(x) Road, driveway or railroad — impacts other than perpendicular crossings of streams and other surface waters subject to this Rule. (Allowable with
Mitigation Upon Authorization)
(y)(ii) Road, driveway or railroad — perpendicular crossings of streams and other surface waters subject to this Rule. (ii) Impact greater than one-third of a
acre but equal to or less than one-third of an acres of riparian buffer. (Allowable Upon Authorization)
(kk)(i) Utility — Sewer Lines — New Line Construction/Installation Activities — Perpendicular crossings of streams and other surface waters subject to this
Rule or perpendicular entry into the riparian buffer that does not cross a stream or other surface water subject to this Rule provided that vegetation is
allowed to regenerate in disturbed areas outside of the permanent maintenance corridor: (i) Construction corridor of less than or equal to 40 linear feet
wide and a permanent maintenance corridor that is equal to or less than 30 feet wide. (Deemed Allowable)
(II)(i) & (II)(iii) Utility — Sewer Lines — New Line Construction/Installation Activities — Impacts other than perpendicular crossings provided that vegetation is
allowed to regenerate in disturbed areas outside of the permanent maintenance corridor: (i) Zone 2 impacts (Deemed Allowable) / (iii) Zone 1 impacts
other than those listed above. (Allowable with Mitigation Upon Authorization)
(pp)(i) Utilities — Non -sewer aerial lines — Perpendicular crossings of streams and other surface waters subject to this Rule or perpendicular entry into the
riparian buffer that does not cross a stream or other surface water subject to this Rule: (i) Disturb equal to or less than 150 linear feet wide of riparian
buffer provided that a minimum zone of 10 feet wide immediately adjacent to the waterbody is managed such that only vegetation that poses a hazard or
has the potential to grow tall enough to interfere with the line is removed, that no land grubbing or grading is conducted in Zone 1, and that poles or aerial
infrastructure are not installed within 10 feet of a waterbody. (Deemed Allowable)
(qq)(ii) Utilities — Non -sewer aerial lines — Impacts other than perpendicular crossings of streams and other surface waters subject to this Rule or
perpendicular entry into the riparian buffer that does not cross a stream or other surface water subject to this Rule: (ii) Impacts in Zone 1 provided that a
minimum zone of 10 feet wide immediately adjacent to the waterbody is managed such that only vegetation that poses a hazard or has the potential to
grow tall enough to interfere with the line is removed, that no land grubbing or grading is conducted in Zone 1, and that poles or aerial infrastructure are
not installed within 10 feet of a waterbody. (Allowable Upon Authorization)
April 2024 Updates = Impact 8 / S21; also Impact 16a/16b/16c were combined into the new 16a & 16b; no changes to streams, wetlands or FAA EO
11990 Wetlands.
Clean Water Act (CWA) Section 404 & 401 Application — MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 7 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC

b. FAA EO 11990 WETLANDS
The United States Executive Order 11990 concerns the protection of wetlands and states as follows.
Federal agencies are required to "avoid to the extent possible the long- and short-term adverse impacts associated with the
destruction or modification of wetlands and to avoid direct or indirect support of new construction in wetlands wherever there is
a practicable alternative." The stated purpose of this Executive Order is to "minimize the destruction, loss, or degradation of
wetlands, and to preserve and enhance the natural and beneficial values of wetlands." (USEPA, 1977)
The FAA applies these protections to all wetlands regardless of jurisdiction under Sections 404 and 401 of the Clean Water Act or
not. As such, the applicant will provide mitigation for the loss of non -jurisdictional wetlands protected under EO 11990 as listed in
the table below.
Sheet Impact
umber
etland Impact Mitigation RaE(i
Name (Ac)
tion
)
Impacts/LossTotal
Clean Water Act (CWA) Section 404 & 401 Application — MITIGATION PLAN Updated April 2024
Runway 5L/23R Replacement Project Page 8 of 8
Raleigh -Durham International Airport, Wake and Durham Counties, NC