20200154 Ver 1_CAMA Impacts table_20200319

Strickland, Bev
From: Hales, Jason C. < [e-mail] >
Sent: Thursday, March 19, 2020 11:50 AM
To: Mairs, Robb L
Subject: [External] RE: CAMA Impacts table
External email. Do not click links or open attachments unless you verify. Send all suspicious email as an attachment to
[e-mail]
Greg Currey requested additional description of the wetland impacts on Mt. Misery Rd and impacts at the river. This is
the text DCM and USACE have. Thank you!
The bay forest wetlands along Mt. Misery Road with proposed impacts contains a sparse understory with thick
greenbrier and a canopy of young sweet gum, red maple and loblolly pine. The planned impacts are primarily within the
maintained road right-of-way. Limited clearing of the young tree species beyond the maintained road right-of-way
maybe necessary for the pipeline installation. Areas of tree clearing beyond the maintained road right-of-way in the
wetlands will be allowed to revegetate following the pipeline installation. Erosion and sedimentation control measures
will be used throughout the project to prevent sediment from reaching downstream waters and wetlands.
A detailed construction outline describing the materials and methods for the Cape Fear River outfall is attached. The
outfall at the Cape Fear River will be constructed with excavation using a cofferdam. Work at the Cape Fear River
includes the installation of an 18-inch diameter outfall pipe with protection below the NHW line. The outfall pipe will be
reduced to 8-inches in diameter at the end prior to discharge. Construction will include upland excavation and bank
stabilization, horizontal directional drilling (HDD) and in -water excavation using a cofferdam.
The dimensions of the outfall protection area is approximately 30' wide by 70' long. The portion above NHW is
approximately 30' wide by 30' long. The portion below NHW is approximately 30' wide by 40' long. The portion below
NHW will include rip rap and a cast in place concrete frame at the end of the outfall pipe. The frame is approximately 6'
wide by 13' long by 7' tall. Approximately 120 feet of temporary sheet pile will be used for the outfall installation.
Jason Hales, PWS
Coastal Wetland Scientist
CDM Smith 1 5400 Glenwood Ave., Suite 400 1 Raleigh, NC 27612
t: 919.325.3588 1 c: 910.520.18321 [e-mail]
From: Hales, Jason C.
Sent: Thursday, March 19, 2020 11:35 AM
To: Mairs, Robb L <[e-mail]>
Subject: CAMA Impacts table
Jason Hales, PWS
Coastal Wetland Scientist
CDM Smith 15400 Glenwood Ave., Suite 400 1 Raleigh, NC 27612
t: 919.325.3588 1 c: 910.520.18321 [e-mail]

NWTP Wetland and Stream Crossings and Impacts Summary
Crossing
Feature
Label
Impact
Label
Impact Description
Impact Type
Impact Area
square feet
Impact
Length
linear feet
Crossing
Length
under
feature
linear feet
Crossing
Depth
under
feature
feet
Stream Feature
PS1
Si
bank stabilization
Permanent
30
Cape Fear River
PS1
OHW1
install outfall
Permanent
1200
Cape Fear River
PS1
OHW2
staging pipe in river
Temporary
2180
Cape Fear River
1
W1
HDD
45
-20
IS1
HDD
10
-20
UT to Cape Fear River
W2
HDD
650
-30
W2
W2
HDD staging and access
Temporary
5020
2
W2
HDD
300
-15
IS2
HDD
10
-151
UT to Hood Creek
3
W4
HDD
100
-15
PS2
HDD
10
-15
Bay Branch
4
W8
W8
surface installation
Permanent
5340
900
-3
5
W12
W12
surface installation
Permanent
3040
480
-3
6
W13
W13
surface installation
Permanent
730
120
-3
7
W22
W22
surface installation
Temporary
1085
50
-3
IS4
S2
surface installation
Temporary
250
25
10
-3
UT to Hood Creek
8
W24
W24
surface installation
Temporary
356
20
-3
IS5
IS3
surface installation
ITemporary
1 250
251
10
-3
UT to Hood Creek
Impact Totals
Total Temporary Wetland Impacts
Total Permanent Wetland Impacts
Total Temporary Stream Impacts
Total Permanent Stream Impacts
Total Temporary OHW Impacts
Total Permanent OHW Impacts
square feet linear feet acres
6461
0.148
9110
0.209
500
50 0.011
30
2180
0.050
1200
0.028