HomeMy WebLinkAbout19961190 Ver 3_401 Application_20171002ATKINS
Atkins North America, Inc.
1616 East Millbrook Rd, Suite 310
Raleigh, North Carolina 27609
Telephone: +1.919.876.6888
Fax: +1.919.876.6848
www.atkinsglobal.com/northamerica
September 20, 2016 D � @
Jean Gibby V D
US Army Corps of Engineers 0C T 2017
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105 DEQ -WATER RESOURCES
Wake Forest, NC 27587
401 g BUFFER P KNITTING
Re: Request for Permit 199501141 Modification for the Town of Hillsborough - West Fork
Eno Reservoir Phase 2 project in Cedar Grove, Orange County, NC
Dear Mrs Gibby,
Atkins North America, acting as an authorized agent for the Town of Hillsborough,
respectfully requests your authorization to modify permit 199501141 (see Book 286 Page
297) associated with the West Fork Eno Reservoir (WFER). This request, is to provide
revised information on temporary dewatering impacts associated with spillway
improvements in support of efforts by the Town to raise the normal pool from the Phase I
elevation (632.2 feet [NAVD88]) to the Phase II elevation (642.2 feet [NAVD88]) already
authorized under this permit (see Figure 1). For your ease of use, we have separated this
request into the following sections: Revised Impacts, Reconciliation of Section 401
Certification, and Supporting Information.
Revised Impacts
For the purposes of this request, two temporary areas of proposed dewatering are needed
to facilitate the other construction improvements necessary for the dam spillway.
Collectively, these improvements will upgrade the dam spillway to accommodate the Phase
II normal pool for the WFER. Besides these two areas of dewatering, the other dam and
spillway improvements will occur outside of waters of the U.S. The location and details of
these two temporary impacts are provided in Figure 2. These two temporary impacts are
most likely already covered in the original permit 199501141, since it allows for the overall
impacts related to improving Phase I to Phase II. Also, both temporary impact areas fall
within the Phase I construction limits or normal pool level. However, the Town is
interested in providing the Corps and N.C. Division of Environmental Quality with details
on these impacts to ensure permit compliance. Table 1 summarizes the impacts of these
two temporary impacts.
This requested revision remains consistent with the overall permit schedule, and will
result in no changes to the overall permit impacts. Since no new areas of impact are
proposed, the mitigation required for these impacts are described in Special Permit
Condition (x).
Page 1 of 5
ATKINS
Spillway Diversion Cofferdam
Upon its original construction, the WFER earthen dam was originally built to the necessary
size to support the development of both Phases I and II. However, the spillway and pool
control structure will require modification so the normal pool elevation can be increased to
the Phase II elevation. To facilitate this modification, the pool elevation of the WFER will be
lowered 4 feet to temporary elevation of 628.2 feet [NAVD88], and then a temporary
diversion cofferdam will be built in the dry. The elevation of the base of the cofferdam will
be at approximately 629 feet [NAVD88], and the top of the cofferdam will be 633 feet
[NAVD88]. This will result in temporary fill impacts from the cofferdam, and temporary
dewatering impacts within the interior of the cofferdam. The area of these impacts is
provided in Table 1. Turbidity curtains will be installed within the lowered pool to provide
sedimentation protection to the reservoir and downstream waters. These impacts will be
temporary in nature, and will be removed once the spillway improvements are complete
and the WFER is raised to the new Phase II normal pool elevation.
Outlet Cofferdam for Filter Diaphragm Installation
A filter diaphragm is an important component of design for both new construction and the
renovation of older embankment dams. The design engineer for the Phase II improvements
recommends the installation of a filter diaphragm around the outlet conduit at the base of
the WFER dam. The intent of the filter diaphragm is to intercept flow that can occur in the
interface between the conduit and soil and filter it to prevent the migration of fine soil
particle out of the embankment.. To facilitate this modification, the outlet conduit will be
plugged with sandbags, and a temporary cofferdam will be constructed around the outlet
within the West Fork Eno River. The plugged flow in the outlet conduit will be pumped
around the dewatered area during construction. These activities will result in temporary
fill impacts from the cofferdam, and temporary dewatering impacts within the interior of
the cofferdam. The area of these impacts is provided in Table 1.
Table 1. Summary
of impacts to waters of the U.S. associated with modifrcotion to permit 199501141
Wetland
Tributary
Project
Impact
Open Water
Impact Length
Component
Feature Name Feature Type Permit Drawing Impact Type Duration
(ACRES)
Impact (ACRES)
(FT)
Spillway
Site 01 Open Water Figure 2 Fill Temporary
N/A
0.19
N/A
Diversion
Cofferdam
Site 02 Open Water Figure 2 Dewatering Temporary
N/A
0.42
N/A
Cofferdam for
Filter Site 03 Tributary Figure Fill Temporary N/A N/A 38
Diaphragm
TOTAL 0 0.61 38
Page 2 of 5
Request for Permit 199501141 Modification for the Town of Hillsborough
Reconciliation of Section 401 Certification
As noted by N.C. Division of Environmental Quality in their certification of the permit
modification issued in June 2016, "the Water Quality Certification was issued to construct
Phase 1 of the proposed reservoir and authorized wetland impacts that correspond to Phase 1
and stream impacts that correspond to Phases 1 and 11 of the reservoir". Since the Phase II
impacts currently included in the Water Quality Certification do not match the impacts
authorized by the 404 permit, this modification request attempts to reconcile these
documents. It is believed that the original Water Quality Certification was issued based
upon the initial permit application materials, rather than the supplemental information
provided by the Town during review that led to the 404 -permit authorization in September
1998. Table 2 itemizes the impacts summarized in the original application (leading to the
Water Quality Certification), as well as the supplemental information provided by the Town
of Hillsborough (leading to the 1998 404 permit). Figure 3 provides the wetland locations
associated with the 404 permit issued in 1998 that need to be included in the modified
Water Quality Certification. The Town of Hillsborough desires to proceed with raising the
WFER to the Phase II normal pool elevation originally authorized, in accordance with the
schedule as noted in Figure 4.
Table 2. Wetland impact information from 1998 404 permit application and supplemental information
provided to the Corps
Streams
(See units Total Phase I Phase 11
Date Item below) (ACRES) (ACRES) (ACRES)
12/19/1995 Town submitted original 404/401 Application 12.42 acres 15.85 acres
3/25/1996 Town submitted additional information, increasing impacts 7.54 miles 28.72 acres 16.65 12.07
4/11/1996 Town submitted revised Application (Phase I only) 6.39 miles 17 acres
4/25/1996 Corps letter to NCDWQ requesting 401 review
9/25/1997 NCDWQ issues Water Quality Certification 9.94 miles 16.65 acres
Various Applicant continues to coordination with Corps
10/21/1998 Corps Issues Permit 7.1 miles 22.96 Acres 16.40 5.7•'
*Source: Special condition (b)
'* Source: Special condition (x)
Supporting Information
Bald Eagle permits
During 2017, Atkins has continued to coordinate with the USFWS and has performed an
additional winter 2017 aerial helicopter survey. The 2017 re -survey confirmed that the
two bald eagle nests, one active since 2015 and the other inactive nest since 2013 remain
in the same locations as previously observed (see Figure 5). No other alternative bald eagle
nests were identified. The Town recognizes that an Eagle Nest Take Permit (Take Permit)
in accordance with 50 CFR 22.27 will be required, and that coordination is underway. Once
coordination with the USFWS for the Take Permit is complete, the inactive nest, which
occurs within the Phase II clearing limits, will be destroyed. See Figure 6 for a draft Phase II
Page 3 of 5
ATKINS
clearing plan. This nest take will occur as soon as the Take Permit is authorized (see Figure
4).
Conditional Letter of Mapping Revision (CLOMR)
A CLOMR letter has been submitted and is currently under review by the N.C. Division of
Emergency Management for the Phase II construction. The Phase II dam modifications are
planned to start construction in October 2017, and the completion of this construction will
lead to the authorized impacts to Waters of the U.S. at some time during the second half of
2018 once the Efland Cedar Grove, Mill Creek, and Cedar Grove Road improvements have
been completed. The road improvements have been designed to accommodate the
proposed new Phase II pool, and these improvements will not be at risk since they have
incorporated this issue into their design.
Mitigation
In the June 2016 permit modification, the proposed Phase 2 mitigation was approved,
which included a surplus of 1.8 acre of wetland credits from the completed Water Quality
Impoundments developed for Phase 1 mitigation, and 7.8 acres of wetland credits from the
North Carolina Division of Mitigation Services. This mitigation would offset the 5.7 acres of
wetland impact for Phase 2 described in Special Permit Condition (x) of the original permit.
Table 3. Summary of wetland mitigation for Phases I and 11 of the West Fork Eno Reservoir. In the "Credit
Transaction" column, wetland impacts are tracked using F ed, while mitigation credits are tracked using
black.
Credit
Phase Item Description Transaction
A Phase I Mitigation Created from Water Quality Impoundments 15.8
Phase I B Phase I Impacts (Special condition: section n. Book 286, Page 301)
C Phase I Remaining Mitigation Credits (A -B) 1.8
D Phase II Impacts (Special condition: section x: Book 286, Page 303) 4 e
Phase II C Phase I Remaining Mitigation Credits 1.8
E Phase II Remaining Impact (D -C) 3,S
Total F Phase II Required Mitigation Credits (E ' 2) using 2:1 Ratio 7.8
Since this permit modification seeks to reconcile Water Quality Certification for Phase II
wetland impacts, the mitigation payments have not been made. The Town of Hillsborough
is also considering whether mitigation bank credits within the Neuse 01 River Basin may
come available during the dam improvements and roadway construction projects but prior
to raising the WFER normal pool above the Phase 1 level. The NC Division of Mitigation
Services has extended their acceptance (see Attachment 2), so that the Water Quality
Certification could be reconciled and the final roadway improvement designs could be
completed and prepared for construction. The mitigation payment to NCDMS will be
completed prior to raising the normal pool the Phase II elevation. As stated in earlier
documents, the wetland mitigation for Phase I, as well as the stream and riparian buffer
mitigation for Phases I and II have already been satisfied (see Special Permit Condition (y)).
Page 4 of 5
ATKINS
If you wish to schedule a meeting at the project site, please contact me at 919-431-5255 or
matt.cusack@atkinsglobal.com.
Thank you for your consideration of this request. If any additional information is needed,
please do not hesitate to contact me (919-431-5255) or Rebecca Berzinis.
Sincerely,
h6b�&4tA�
Matt Cusack
Atkins North America, Inc.
Cc (electronic):
Rob Ridings, NC DWR
Jennifer A. Burdette, NC DWR
Kenny Keel, Town of Hillsborough
Dean Goodison, Atkins
Attachment 1: Figures
Figure 1. Project Location
Figure 2. Temporary Waters of the U.S. Impacts
Figure 3. Wetland Impacts from Original 404 Permit
Figure 4. Proposed schedule for completing permit related activities
Figure S. Nest Locations and Surrounding Land Use
Figure 6. Reservoir Clearing Plan
Attachment 2: Mitigation acceptance extension letter from N.C. Division of Mitigation
Services
Page 5 of 5
ATTACHMENT 1
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Prepared By: Prepared For
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Schnabel Engineering Dam Safety Submittal
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Note:
110-129 Impacted wetlands digitized from 404 Permit Application
199501141 from Book 286 pages 297-307.
Wetlands within one vertical foot of Phase I or Phase II elevation
are considered impacted by that phase.
Phase I and Phase II boundaries shown here are updated layers
based on 2009 USGS 3D Elevation Program (3DEP) Mapping.
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Note:
Impacted wetlands digitized from 404 Permit Application
199501141 from Book 286 pages 297-307.
Wetlands within one vertical foot of Phase I or Phase II elevation
are considered impacted by that phase.
Phase I and Phase II boundaries shown here are updated layers
based on 2009 USGS 3D Elevation Program (31DEP) Mapping.
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ORANGE COUNTY, NORTH CAROLINA
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Project No.:
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Figure 4. Proposed construction schedule for remaining tasks associated with West Fork Eno Reservoir
Start Date End Date
Dam Structural Modifications 10/15/2017 10/31/2011
Borrow Area
3/1/2018
9/30/2018
Clearing
2/1/2018
2/28/2018
Excavation
3/1/2018
7/31/2018
Restoration
10/1/2018
10/31/2011
Phase 2 Pool Tree gearing
2/1/2018
10/31/2011
Construct Access/Egress Roads
2/1/2018
3/31/2018
Construct Skid Roads
2/1/2018
3/31/2018
Tree Clearing
8/1/2018
9/30/2018
Restoration
10/1/2018
10/31/2018
Elland Cedar Grove Road
3/1/2018
9/30/2018
Carr Store Road / Mill Creek Road
3/1/2018
9/30/2018
onmental Tasks
Inactive Eagle Nest Take Permit Review
10/1/2017
11/1/2017
Inactive Eagle Nest - REMOVAL WINDOW
11/1/2017
11/15/201;
Active Eagle Nest Disturbance Permit Review
10/1/2017
11/1/2017
Window for Winter 2018 Eagle Nest Helicopter
Survey
1/15/2018
1/31/2018
Active Eagle Nest Protection: Tree Clearing within
660 -foot buffer requires monitoring per Eagle
Disturbance Permit
11/1/2017
7/31/2018
404/401 Permit expiration
12/31/2018
12/31/2011
2017
Permit 1S
These dates are approximate, and may be affected by construction or
2018
2019
Prepared By:
Prepared For.
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Nest Location and Surrounding Land Use
West Fork Eno River Reservior Phase II
ORANGE COUNTY, NORTH CAROLINA
Dwn By: RLG
FIGURE
Ckd By:
BEC
Date:
6r14/2017
5
Project No.:
100041454
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GENERAL NOTES:
� 1
AREA TO BE MANAGED - ♦�_
/ / 1 - 1. LOCATION OF PROPOSED SKID TRAILS ARE APPROXIMATE. CONTRACTOR SHALL PROPOSED SKID TRAIL
DURING BRIDGE/CULVERT / ♦ \\l` /`
I ! RENOVATIONS DETERMINE THE LOCATION OF THE TRAILS SO AS TO FOLLOW THE NORTH
\ / \ / -- \ .1 ♦ , CAROLINA FORESTRY BMP MANUAL STANDARDS FOR SKID TRAILS SO AS TO LIMIT —ROADS y
THE DISTURBANCE OF THE VEGETATION AND SOIL.
ACCESS ROAD A5 \ - I DECKS /LANDINGS
♦ + /" \
\� . I 2. EROSION CONTROL MEASURES SHALL BE IMPLEMENTED AS SHOWN AND AS
NEEDED AND SHALL BE INSTALLED AS DESCRIBED IN THE NORTH CAROLINA \�� a PROJECT: 13821015.02
R / 1 C\.\`♦1V CLEARING LIMITS
C EEK R ! \ FORESTRY BMP MANUAL. € DATE: MAY 2017
OigO \ / CONSTRUCTION ENTRANCES t DRAWING NO.
3. ORANGE COUNTY GIS DATA WAS USED FOR CLEARING PLAN VIEWS EXCEPT w
WHERE SURVEY DATA COLLECTED BY CH ENGINEERING IS SHOWN, SURVEY C-01
DRAWINGS DENOTING THESE AREAS WILL BE INCLUDED WITH FINAL DRAWING Sc 1'-- >!
SET. x SHEET
1 o 66W 10 03 OF 12
ATTACHMENT 2
Mitigation Services
ENVIRONMENTAL QUALITY
July 6, 2017
Kenny Keel
Town of Hillsborough
PO Box 429
Hillsborough, NC 27278
Project: Permit 199501141 Mod. for WFER Reservoir Ph. 2
ROY COOPER
MICHAEL S. REGAN
Expiration of Acceptance: January 6, 2018
County: Orange
The purpose of this letter is to notify you that the NCDEQ Division of Mitigation Services (DMS) is willing to accept
payment for compensatory mitigation for impacts associated with the above referenced project as indicated in the
table below. Please note that this decision does not assure that participation in the DMS in -lieu fee mitigation
program will be approved by the permit issuing agencies as mitigation for project impacts. It is the responsibility
of the applicant to contact permitting agencies to determine if payment to the DMS will be approved. You must
also comply with all other state, federal or local government permits, regulations or authorizations associated with
the proposed activity including G.S. § 143-214.11.
This acceptance is valid for six months from the date of this letter and is not transferable. If we have not
received a copy of the issued 404 Permit/401 Certification/CAMA permit within this time frame, this
acceptance will expire. It is the applicant's responsibility to send copies of the permits to DMS. Once DMS
receives a copy of the permit(s) an invoice will be issued based on the required mitigation in that permit and
payment must be made prior to conducting the authorized work. The amount of the in -lieu fee to be paid by an
applicant is calculated based upon the Fee Schedule and policies listed on the DMS website.
Based on the information supplied by you in your request to use the DMS, the impacts for which you are
requesting compensatory mitigation credit are summarized in the following table. The amount of mitigation
required and assigned to DMS for this impact is determined by permitting agencies and may exceed the impact
amounts shown below.
Upon receipt of payment, DMS will take responsibility for providing the compensatory mitigation. The mitigation
will be performed in accordance with the In -Lieu Fee Program instrument dated July 28, 2010 and 15A NCAC
0213 .0295 as applicable. Thank you for your interest in the DMS in -lieu fee mitigation program. If you have any
questions or need additional information, please contact Kelly Williams at (919) 707-8915.
cc: Matt Cusack, agent
Sincerely,
Je . B Stanfill
Asset Management Supervisor
State of North Carolina I Environmental Quality I Mitigation Services
1652 Mail Service Center I Raleigh, NC 27699-1652 1 217 W. Jones Street, Suite 3000
919 707 9976 T
River
CU Location Stream (feet) Wetlands (acres) Buffer I -" Buffer II
Basin
(&digit HUC) (Sq. Ft.)
__
Impact
_
Cold Cool Warm RI avian Non-Ri avian Coastal Marsh
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Upon receipt of payment, DMS will take responsibility for providing the compensatory mitigation. The mitigation
will be performed in accordance with the In -Lieu Fee Program instrument dated July 28, 2010 and 15A NCAC
0213 .0295 as applicable. Thank you for your interest in the DMS in -lieu fee mitigation program. If you have any
questions or need additional information, please contact Kelly Williams at (919) 707-8915.
cc: Matt Cusack, agent
Sincerely,
Je . B Stanfill
Asset Management Supervisor
State of North Carolina I Environmental Quality I Mitigation Services
1652 Mail Service Center I Raleigh, NC 27699-1652 1 217 W. Jones Street, Suite 3000
919 707 9976 T