20180049 Ver 1_More Info Received_20180326

Goss, Stephanie
From: Goss, Stephanie
Sent: Friday, March 23, 2018 10:34 AM.
To: 'Rajit Ramkumar'
Subject: City of Durham -Eno River Outfall Phases I and II
Rajit,
I started preparing the letter for the above mentioned site. However, I, cannot proceed with the approval letter until I
have the following:
• On the PCN and impact maps, the buffer impacts are not specified 'as to whether they are permanent or
temporary. Please resend/e-mail me page 8 and,9 bf the PCN with column 6b competed.
Thanks!
Stephanie Z..Goss
Environmental Senior Specialist.
Division of Water Resources
Raleigh Regional Office
3800 Barrett Drive
Raleigh., NC 276o9
919=791-425,6.
E-mail correspondence to and from this address may be subject to the .
North Carolina Public Records Law and,may be disclosed to third parties
1

kc'd = 3 f 2c. 1 i ,-z
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually,list all buffer impacts
.below. If any impacts require mitigation, then you IIAUST fill out Section D of this form.
6a. Project is in which protected basin?
® Neuse ❑ Tar -Pamlico,❑ Catawba ❑ Randleman ❑ Other: .
6b.
Buffer impact
number-
Permanent (P) or
Temporary T
6c.
Reason for
impact
6d.
Stream name
6e.
Buffer mitigation
required?
6f.
Zone 1 impact
(square feet)
6g.
Zone 2 impact
(square feet)
Site 1 (T)
Sewer line
Eno River
No*
3665.62
2454.2.6
Site 1 (P)
Sewer line
. Eno River
No**
8236.08
Site 2 (T)'
Sewer line
Eno River
No*
3605.51
2419.97
Site 2 (P)
Sewer line
Eno River
No**
884.03
Site 2 (T)
Sewer line
Eno River
No***
319.74
Site 3 (T)
Sewer line
Eno River
No*
3693.69
2605.26
Site 3 (P)
Sewer line
Eno River
No**
12733.72
Site 3 (T)
Sewer line
Eno River
No***
1686.17
Site 3 (P)
Sewer line
Eno River
Yes****
120.92
Site 4 (P)
Sewer line
Eno River
No**
36377.27
Site 4 (T)
Sewer line
Eno River
No***
20344.09
Site 4 (P)
Sewer line
Eno River
Yes****
3875.74
Site 5"(T)
Sewer'line
Crooked Creek
No*
2922.82
1620.26
Site 5 (P)
Sewer line
Eno River
No**.
16981.01
Site 5 (T)
Sewer line
Eno River
No
4995.45
Site 5'(P) .
Sewer line
Eno River
Yes****
1016.62
Site 6 (T)
Sewer line
Eno River
No*
3711.37
2488.88
Site 7(P)
Sewer line
Jumping Run
No**
928.53
Site 8 (T)
Sewer line
Jumping Run
No*
3660.36
2441.80
Site 8.(P)
Sewer line
Jumping Run
No**
9654.15
Site'8 (T)
Sewer line
Jumping Run
No***
4068.72
Site 8, (P)
Sewer line
Jumping Run
Yes****
263.10
Site 9 (T)
Sewer line
Jumping Run
No*
3753.26
2510.93
Site 9 (P)
Sewer line
Jumping Run
No**
10835.58
''Site 9 (T)
Sewer line
Jumping Run
No
3848.06
Site 1,0 (P)
Sewer line
Jumping Run.
No**
3562.20
Site 11 (T)
Sewer line
Jumping Run
No*
2860.99
1558.17
Site 11 (P)
Sewer line
Jumping Run
No**
1293.16 ,
Site 12 (T)
Sewer line
UT to Mill
Creek/Mill Creek
No*
5452.75
1017.17
Site 12 (P)
Sewer line
UT to Mill
Creek/Mill Creek
No
4237.66
Site 13 (P)
Sewer line
Mill Creek
No**
2888.74
Site 13 (T)
'Sewer -line
Mill Creek
No***
1420.91
Page 8 of 13

D. Impact Justification and Mitigation'
1. Avoidance and Minimization
UT to Crooked .
Theproposed alignment was selected based on geotechnical investigations, a Phase I property assessment, minimization of
floodplain impacts, minimization of environmental and cultural resources impacts (5 Alignments Considered).' The alignment
follows the existing sewer easement where possible but is constrained by steep topography and development along sections
Site 14 (P)
Sewer line
Creek;. Crooked
No**
plant mix and allowed to revegetate naturally. Erosion control are proposed along the entire construction corridor: A
7273.42
1 b. Specifically describe measures taken'to avoid or minimize the proposed impacts through construction'teohniques.
I
Logging mats will be used in wetlandareas. Temporary fencing will be placed on wetland edges'where 'practicable to
Creek
following construction. Stream crossings will occur at 90 -degree angles where possible. Temporay st'ream.impacts will
be restored to preconstructionj elevations using native materials. Permanent stream impacts will be restored to
preconstruction elevations using rip.rap allowing native bed material to reestablish over time. Paralle[Zone 1 buffer
impacts that occur within forested areas within the temporary project construction corridor will be replanted using two
native tree, shrub, or forest species and monitored until a species density of 260 trees per.acre at maturity are
UT to Crooked
credits will be purchased fromi a mitigation bank for parallel Zone 1 buffer impacts occurring within the permanent
maintenance easement. These credits will be located in same HUC (Neuse 03020201 and upper Falls Lake Basin) in
which the impacts occur.
Site 14 (T)
Sewer line,
Creek; Crooked
No
5759.25
2b: If yes, mitigation is required by (check all that apply):
❑ DWQ, ❑ Corps .
Creek
2c. If yes, which mitigation option will be.used for this
❑ Payment to in -lieu fee program
project?
Site 15 (P)
Sewer line,
Crooked Creek
No**
155T.25
Site, 151 (T)
Sewer line
Crooked Creek
No***
327.31
6h. Total buffer impacts
81,372.44
136,559.50
6i. Comments: *Allowable. non=electric utility line perpendicular crossing. **Allowable non -electric utility line impacts' other than
perpendicular in Zone 2 only. ***(Replanted Buffer Areas, Zone 1) Allowable with -mitigation non -electric utility, line .impacts
other than perpendicular in Zone -1: ****(Permanent Maintenance Corridor, Zone.1) Allowable with mitigation non -electric
utility line impacts other than perpendicu,lar'in Zone 1.
D. Impact Justification and Mitigation'
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.-
roject.The
Theproposed alignment was selected based on geotechnical investigations, a Phase I property assessment, minimization of
floodplain impacts, minimization of environmental and cultural resources impacts (5 Alignments Considered).' The alignment
follows the existing sewer easement where possible but is constrained by steep topography and development along sections
of the Eno River, Crooked Creek! and Jumping Run. The alignment generally follows the toe of the grade and avoids streams
and wetland areas where possibl'e�-with stream crossings generally occurring at a perpendicular angle. Temporary stream
impacts will be restored to preconstruction elevations using native material. Permanent stream impacts will.be restored to
preconstruction elevations using rip rap allowing native bed material to reestablish over time. Construction•equipment will'
utilize mats in wetland areas to minimize wetland impacts and temporary wetland impact areas will reseeded,with a wetland
plant mix and allowed to revegetate naturally. Erosion control are proposed along the entire construction corridor: A
permanent 10 -foot utility maintenance easement will be maintained following construction.
1 b. Specifically describe measures taken'to avoid or minimize the proposed impacts through construction'teohniques.
I
Logging mats will be used in wetlandareas. Temporary fencing will be placed on wetland edges'where 'practicable to
minimize temporary wetland !impacts, Temporary wetland impact areas will be reseeded and allowed to revegetate
following construction. Stream crossings will occur at 90 -degree angles where possible. Temporay st'ream.impacts will
be restored to preconstructionj elevations using native materials. Permanent stream impacts will be restored to
preconstruction elevations using rip.rap allowing native bed material to reestablish over time. Paralle[Zone 1 buffer
impacts that occur within forested areas within the temporary project construction corridor will be replanted using two
native tree, shrub, or forest species and monitored until a species density of 260 trees per.acre at maturity are
established. The restoration' plan is located on the detail sheets of the Phase I and Phase II design plans. Mitigation
credits will be purchased fromi a mitigation bank for parallel Zone 1 buffer impacts occurring within the permanent
maintenance easement. These credits will be located in same HUC (Neuse 03020201 and upper Falls Lake Basin) in
which the impacts occur.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for
❑ Yes ® No
impacts to Waters of the U.S. or Waters of the State?
2b: If yes, mitigation is required by (check all that apply):
❑ DWQ, ❑ Corps .
❑ Mitigation bank
2c. If yes, which mitigation option will be.used for this
❑ Payment to in -lieu fee program
project?
❑ Permittee Responsible Mitigation
Page.9 of 13