20140486 Ver 1_RS Preliminary Tech Memo 4-22-2014_20140422

TECHNICAL MEMORANDUM
Preliminary Information:
Hollowell Mitigation Site in Johnston County
Date: April 22, 2014
Prepared For: US Army Corps of Engineers
NC Department of Environment and Natural Resources
Prepared By: Restoration Systems
Ecosystem Planning and Restoration
Restoration Systems (RS) is in the process of evaluating
the mitigation potential of the Hollowell Property
(Site), located in Wayne County. The purpose of this
memorandum is to provide preliminary information to
the US Army Corps of Engineers — Wilmington District
(USACE) and the NC Department of Environment and
Natural Resources in order to solicit comments that
may be helpful in developing formal mitigation plans
for the site. The Site is rather large and complex, and
is expected to make use of the NC Coastal Plain Stream
Guidance; therefore, agency input and comments are
requested to aid understanding the potential of the
Site for mitigation purposes.
Overview
The Site is located in Wayne County, approximately six miles west of Goldsboro (Figures 1, 2, and 3), and lies
within HUC 03020201 of the Neuse River Basin (Figure 4). The Site includes two unnamed tributaries (UT1 and
UT2) that flow directly to the Neuse River, as well as extensive floodplain and wetland areas adjacent to the
Neuse River itself (Figure 2). As a result, the Site offers the unique opportunity to work at a watershed scale
and also enhance/protect valuable riparian areas and wetlands along the Neuse River. In its current condition
(Figure 5), the property is used for agricultural crops and timber production. The conceptual mitigation plan for
the site includes stream restoration and enhancement, riparian wetland restoration and enhancement, riparian
buffer restoration, and nutrient buffer restoration.
Hollowell Mitigation Site — Wayne County Page 1

TECHNICAL MEMORANDUM
Preliminary Assessments
Field assessments have been performed by RS staff,
Kevin Tweedy and Erin Bennett with Ecosystem
Planning and Restoration (EPR), and Mike Wood and
Tom Dickinson with the Catena Group (Catena).
Assessments to date have focused on preliminary
evaluations of stream, wetland, and buffer conditions
onsite, sources of degradation, wetland and hydric soil
boundaries, and uplift/mitigation potential. EPR staff
members have walked the Site streams in October
2013 and February 2014 to assess stream conditions,
sources and levels of degradation, buffer conditions,
and mitigation options. EPR also provided initial
estimates of wetland mitigation potential for the Site.
Catena performed site evaluations in March and April 2014 to evaluate hydric soil and jurisdictional wetland
boundaries (Figure 5), and refine area estimates for wetland mitigation. Catena also identified significant
mussel communities along the wooded portion of UT2 that offer the unique opportunity for preservation and
enhancement of these critical aquatic habitats. NWI wetland mapping and NRCS soils are provided in Figures 6
and 7, respectively, for reference.
Mitigation Concept Plan
The conceptual mitigation plan for the Site involves the
following components: stream restoration and
enhancement, riparian wetland restoration and
enhancement, buffer restoration, and protections of
additional uplands and existing buffers. Each
component is described briefly below, proposed
mitigation amounts are summarized in Table 1, and the
mitigation concept plan is illustrated in Figure 8.
Stream Restoration is proposed along UT1 and UT2.�x
Both stream systems currently exist as channelized
headwater streams that are functioning as agricultural
ditches. Restoration reaches will be restored to their Photo 3. Wooded section of UT2 that contains mussel
historic floodplains through valley restoration practices communities. Reach is proposed for stream
that incorporate a small pilot channel sized to enhancement.
approximately the inner berm return period flow (less
than one year return period). This approach will promote the development of in -stream habitat that could be
colonized by aquatic mussel species that have been observed on the Site. This design approach will also
provide frequent overbank flooding to hydrate the adjacent wetland restoration areas.
Hollowell Mitigation Site — Wayne County Page 2

TECHNICAL MEMORANDUM
Stream Enhancement is proposed along the
downstream wooded portion of UT2. High quality
mussel assemblages have been identified along this
wooded portion of UT2; therefore, stream
enhancement is proposed for this reach allowing
minimal disturbance to the existing stream system. The
wooded reach of UT2 is relatively stable in its existing
condition, and exhibits good instream habitat, but there
are several small headcuts primarily on the lower end of
the stream that are threatening further incision and
degradation of the system. The headcuts appear to be
primarily the result of past stream channel
manipulation and an old culverted stream crossing that
has since blew out. Instream grade control structures
will be selectively installed along the reach to prevent
future incision, protecting the existing mussel
communities and the stream's existing connection with
its wetland floodplain.
Riparian Wetland Restoration is proposed along UTI and UT2 in areas where existing hydric soils have been
drained for agricultural crops. The stream restoration approaches proposed will reconnect the streams with
these historic floodplain wetland areas, decreasing drainage and restoring wetland hydrology. Lateral drainage
features will also be filled and removed as part of the proposed restoration.
Riparian Wetland Enhancement is proposed for existing wetland areas along the Neuse River that have been
cleared for timber production. Enhancement will be achieved by replanting appropriate native tree and shrub
species, filling several existing drainage ditches and swales, and by replanting a substantial amount of adjacent
upland buffers that will further protect water quality of the system and provide habitat diversity along the
Neuse River corridor
Riparian Buffer Restoration is proposed along all streams within the project area that do not currently have a
riparian buffer. Existing cleared areas of buffer include agricultural fields and areas that have been cleared for
timber production along UT1 and UT2.
Nutrient Buffer Restoration is proposed along all stream segments and ditches, including approximately 7,400
feet of the Neuse River, out to a distance of approximately 200 feet from the stream/ditch channels. Adding
the additional width of nutrient buffers along all stream reaches will provide additional protection to the water
quality of the tributary streams and the Neuse River.
Hollowell Mitigation Site — Wayne County Page 3

TECHNICAL MEMORANDUM
Table 1. Conceptual Mitigation Summary — Hollowell Site
Mitigation ApproachSize
III i
Proposed Credit
Ratio
Potential Credits
Stream Restoration
9500 ft
1 :1
9500
Stream Enhancement
2000 ft
2 : 1
1000
Wetland Restoration
25 ac
1 : 1
25
Wetland Enhancement
62 ac
3 : 1
20
Riparian Buffer Restoration
17 ac
1 :1
17
Nutrient Buffers
59 ac
Upland Buffer
76 ac
No Credit Buffer
11 ac
Constraints
There are few constraints to the proposed project. Two existing farm road crossings, one on UT1 and one on
UT2, will be incorporated to allow land access after the proposed mitigation project is implemented. These
crossings will not interfere with the hydrologic restoration of the stream or wetland systems upstream or
downstream of the roads. An existing overhead utility line runs approximately east to west across the site and
crosses UT1 and UT2 once. The area of the road crossings and the utility easement will be cut out of the
proposed conservation easement boundary for the site.
Hollowell Mitigation Site — Wayne County Page 4

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