20081026 Ver 1_More Info Received_20081117

?aker
November 7, 2008
NC Division of Water Quality
Attn: Cyndi Karoly
401/Wetlands Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
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Michael Baker Engineering, Inc.
797 Haywood Road
Suite 201
Asheville, North Carolina 28806
828-350-1408
FAX [phone]
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Subject: Robinson Creek Restoration Project
Cane Creek (Robinson Creek to Cane Creek) [040302, 6-57-17, C, TR]
Dear Ms. Karoly:
On July 7, 2008, Riverlink received your request for more information referencing the June 27, 2008
permit application for this stream and riparian restoration project. Riverlink has been waiting on
stormwater information pertaining to the adjacent site development to complete its response to these
matters. Included with this response are the following attachments: (A) Updated Erosion and
Sedimentation Control Plan, (B) Updated planset, (C) Updated financial responsibility form, and (D)
Central Park Development calculations for detention. Some background information and clarification
must be made prior to responding to the specific questions:
a) There is a development underway immediately adjacent to the stream and riparian project being
proposed. The adjacent development, "Central Park", donated a conservation easement to the
N.C. Clean Water Management Trust Fund (CWMTF) so that Riverlink and its consultant
(Michael Baker Engineering, Inc.) could design and construct a stream restoration project to
improve channel stability, water quality, and habitat. The two projects have separate plans,
separate designers, separate funding, and are not part of a common plan of development (or
mitigation). Nevertheless, there is a high degree of coordination that must take place between
Riverlink and the Developer to facilitate two projects taking place at the same time in such close
proximity.
b) As part of this coordination, topography (grading), utilities, and stormwater mapping information
from Central Park have been included on Riverlink's plans as base-mapping. Riverlink's original
plans submitted for permitting showed construction activities involving the removal of
stormwater pipes and installation of "ponds". The plans have been revised as Riverlink's
contractor will not be performing the previously depicted modifications to the stormwater system
for the following reasons:
• There were a number of pipes originally shown on the plans that discharged directly into
the stream. These pipes pertain to the adjacent development and Riverlink has convinced
the developer to shorten the pipes and direct the flow into their other stormwater
infrastructure (primarily a large pond - "Main Pond" as shown on base-mapping).
• While the pipes pertain to the development, they do not gain stormwater inflow from the
Central Park development. They are installed with the sole purpose of extending the
culverts that transmit storm flow from small watersheds on the opposite side of the road
(watersheds that pertain to neither the stream project nor the development project, but
which generate runoff during rain events). The developer has added extra storage volume
to the Main Pond to accommodate runoff from these watersheds.
• In addition, Riverlink has convinced the developer to design detention swales (an
intentionally over-widened segment of swale) to detain flows for water quality benefit
and for wetland habitat. Two Swale detention cells are being installed and both discharge
into a long open channel swale that feeds to the Main Pond.
c) As described above, as part of the Central Park plans, the outlet of an existing ephemeral drainage
feature was extended from its previous location (adjacent to Mills Gap Road, SR-3116) to a
location just inside the conservation easement boundary. The pipe extension is shown on the
plans (attachment B) and it is clearly shown that none of the stormwater from Central Park is
being routed to this drainage path. As previously explained, this ephemeral drainage is now
being routed to the Developer's main stormwater pond at the bottom of the project. Prior to being
routed to the pond through a grass-lined swale, the pipe outlets into a "detention swale" feature
and detail at location D4 on Sheet C2 of the Central Park plans provided by the Developer's
Engineer, Davis Civil Solutions.
As a measure of coordination with the Developer, Riverlink has agreed to have this detention
Swale constructed as part of the stream and riparian restoration project. The Developer's
Engineer has submitted plans and specifications for this feature to Riverlink. These plans are
attached as an addendum to Riverlink's planset. The following points are believed to be true with
relation to this feature:
• There is technically no detention requirement at this location since there has been no
change in the pre- and post-development land conditions of the contributing drainage area
• Despite this, runoff calculations were prepared by the Developer's Engineer to
accommodate the runoff volume from the unmodified watershed as part of the sizing of
the main pond at the bottom of the project. These calculations are submitted as
Attachment D of this response
• The detention swale being constructed (since it outlets to the main pond) is providing yet
another layer of protection above and beyond the local/state stormwater requirements
and will help with attenuation and volume control
Riverlink has developed a planting plan for this feature to ensure that native wetland species are
used to enhance the habitat value of the detention swale. Riverlink hopes to work with the
Developer's Engineer prior to construction to further enhance the habitat value of the swale by
proposing slight variations in the topography inside the swale/basin (to provide diversity typical
of a natural wetland) while maintaining the same storage volume for water quality treatment.
That is the end of the clarification. Here are the requests (in italics) from your July 7th letter and
our responses:
1. The cover letter identifies the project as an EEP. idl delivery project, however, the letter and PCN
application also indicate involvement of the CWMTF. Projects receiving CWMTF monies cannot be used
to generate compensatory mitigation credit.
The reference to an EEP project was erroneous. The project is funded by CWMTF and is not for the
purposes of compensatory mitigation.
2. Please provide reference reach data and morphology tables on the existing channel and the proposed
design channel segments.
While the channel was designed using Natural Channel Design principles, a reference reach approach (in
the strictest sense) was not used. Rather, reference reach ratios appropriate to the stream and valley type
were used from our database of reference reaches and successful projects. Given the antecedent and on-
going land use changes in the watershed, an analogous channel design approach (using reference reach
ratios from a specific reach) was not the favored design approach. Instead, some guidance for typical
geomorphic ratios was coupled with a more data intensive analytical design (HEC-RAS modeling and
sediment transport modeling to assess stable channel dimensions using the Copeland Method) and
empirical data (i.e. Regional Curve and USGS Flow Equations). This three-pronged design methodology
and the construction methods specified in the plans comply with engineering standards of care and
address potential threats to the Clean Water Act during the construction and stabilization of the project.
The tables requested were not developed as part of the design. However, the consultant will provide
typical design ratios from our in-house database, HEC-RAS modeling, design worksheets, sediment
transport calculations, and empirical data upon request. To attempt to address the request, the table below
depicts a general comparison of empirical (NC Mountain Regional Curve for a drainage area of 3.81
Square Miles), analytical (HEC-RAS design flow and 2-year flow averages for the modeling of existing
conditions), and the proposed design information along with design ratios from Baker's in-house
database. Sediment transport calculations and form analysis for 35 cross-sections from the existing
channel reach, along with a more robust analysis using HEC-RAS was used in the final determination of
the design values presented.

OBINSON CREEK
RESTORATION Regional
Curve Existing
(HEC-
RAS
Design
Profile) Existing
(HEC-
RAS 2-
yr
Profile) Baker
Project
and
Reference
Reach
Ratios Design
min max min max
bkf 249 250 345 250
Abkf 54 48 62 42.5
Dbkf 2 1.7 2.9 1.9
Wbkf 31 28 21 22
W/D Ratio 15.5 10 14 11.4
Max Depth Ratio (Dmax/Dbkf) 1.1 1.3
Dmax 2.1 2.5
Bank Height Ratio (Dtob/Dmax) 1 1.1
Bank Height Ratio 1 1
Meander Length Ratio (Lm/Wbkf) 7 12
Meander Length (Lm) 154 264
Radius of Curvature Ratio
(Rc/Wbkf)
2
3
Radius of Curvature (Rc) 44 66
Meander Width Ratio Wblt/Wbkf) 3.5 8
Belt Width (Wblt 77 176
Sinuosity K 1.2 1.6 1.2
Valle Slope Sval) 0.005 0.015
Riffle Slope Ratio (Srif/Sch) 1.5 2
Riffle Slope (Srif) 0.015 0.02
Pool Slope Ratio (S ool/Sch) 0 0.2
Pool Slope (Spool) 0 0
Pool Width Ratio (W ool/Wbkf) 1.3 1.7
Pool Width (W pool) 28.6 37.4
Pool-pool Spacing L s/Wbkf 4 7
Pool-pool Spacing (L s) 0 0
3. Please provide details on the "stormwater pools " including design information and a planting plan.
(This was also addressed at the beginning of the response under the background information and
clarification).
The design information for the detention swale that our contractor will construct using plans and details
from the Central Park Developer's Engineer has been attached as a supplement to our updated plans in
Attachment B. As previously noted, the Central Park Engineer provided calculations (Attachment D) that
were used to check the size of the main pond. The detention swale is a supplementary feature that is
providing additional volume and runoff control in excess of the calculated requirement. The outfall from
the detention Swale is provided along with the plan details. Furthermore, the outfall is not a regulated
outfall as it is feeding into the next stormwater feature, a drainage swale which transmits flow to the main
pond.
Riverlink is going to work with the developer to enhance the planting plan from the Central Park
plansheets. Riverlink has provided a planting table sheet on page 22 of the attached plans. Plants will be
utilized based on their tolerance to inundation.
This should address this concern as any design and planting information for the other features shown as
base-mapping should be provided to the state by the Developer as part of the Developer's permitting
process.
As previously stated, we believe that the work being proposed will improve stream stability and stream
and riparian habitat. The conservation easement required by the N.C. Clean Water Management Trust
Fund program we have established a conservation easement on this site that will protect the stream
corridor from on-going development in this watershed. We believe that the results of this project will
improve habitat at this site for native aquatic and terrestrial species and provide long-term protection.
Thank you for your patience in our delayed response. If you have any questions, please contact me as
soon as possible at 828-350-1408 ext. 2007 or 828-545-3865.
Sincerely,
Michael Baker Engineering, Inc.
Jacob McLean, PE
Project Manager
ATTACHMENT A. UPDATED EROSION AND
SEDIMENTATION CONTROL PLAN
EROSION AND SEDIMENT CONTROL PLAN
Robinson Creek Restoration Project
Asheville, Buncombe County, North Carolina
Original: June 16, 2008 Updates: November 3, 2008
Prepared by
Michael Baker Engineering, Inc.
797 Haywood Road
Suite 201
Asheville, North Carolina 28806
Phone: [phone]
Fax: [phone]
Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
Introduction
This narrative is submitted as part of a Sediment and Erosion Control Plan for the Robinson
Creek Restoration Project. The project is being sponsored by the North Carolina Clean Water
Management Trust Fund (CWMTF) in partnership with RiverLink. The goals of the project are
to improve water quality, reduce stream bank erosion by improving channel stability, improve
the hydrologic connections between creek and floodplain, and enhance aquatic and terrestrial
habitat. The project includes the following elements:
• Restoration of currently channelized, eroding stream reaches by creating a stable channel
with access to the floodplain.
• Enhancement of an unnamed tributary.
• Improve in-stream habitat by providing stable riffles and pools, creating deeper pools,
introducing woody debris, and reducing bank erosion.
• Establishment of native stream bank and floodplain vegetation to increase storm water runoff
filtering capacity, improve bank stability, provide shading to decrease water temperature,
provide cover, improve wildlife habitat and protect this area with a permanent conservation
easement.
• Improvement to terrestrial (and aquatic), habitat by restoring a dense stand of native trees,
shrubs and other vegetation within the riparian zone and throughout easement area, creating a
diverse native plant community.
While only 7 acres are actually being impacted in some way by the project, the smallest area that
could be drawn to encompass the limits of disturbance without having island pieces was 11
acres. Within this area, all grading, staging, and haul roads are contained. This application
represents land disturbing activities associated solely with the Robinson Creek Restoration
Project. Other areas adjacent to the Robinson Creek Restoration Project that have been disturbed
are not associated with the scope of work for which Michael Baker Engineering, Inc., RiverLink,
or the Clean Water Management Trust Fund is responsible. An application fee of $455.00 is
enclosed.
The project will be permitted under a US Army Corps of Engineers (USACE) Nationwide permit
27. Project review and comments have been solicited from the North Carolina Wildlife
Resources Commission. Water quality 401 certification will be sought from the N.C. Division of
Water Quality in conjunction with the permit application submittal to the USACE.
Existing Site Conditions
The Robinson Creek restoration site is located off of Mills Gap Road, 1.7 miles east of the
intersection of Mills Gap Road and Sweeten Creek Road. The site begins at Mills Gap Road
and extends approximately 3,837 feet downstream through what was the Brookwood Golf
Course. (Figure 1). Robinson Creek is a "blue-line" stream, as shown on the USGS topographic
quadrangle for the site, and is perennial, based on field evaluations using NCDWQ stream
assessment protocols. Located in the French Broad River Basin, Robinson Creek is a low
gradient, gravel bed stream. The project reach on Robinson Creek is listed by the state as
supporting a wild trout population. One unnamed tributary (UT) to Robinson Creek is included
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
in the project. The total current length of Robinson Creek and its tributary within the proposed
conservation easement is 3,837 linear feet (LF).
The Robinson Creek Restoration Project streams drain a watershed that contains a mixture of
residential development and forest land. The general land use surrounding the site has been in
medium-density residential development and in recreational use (golf course). Future plans for
the surrounding properties include construction of a multi-family development. However, the
restoration project area will be set aside as part of a green space and park to protect the
floodplain and increase the recreational value of the site. Existing land cover within the project
site consists of golf fairways with some exotic, invasive vegetation and forested area adjacent to
the course. There is currently no riparian buffer present as the majority of the project area is
between fairways. Most of the project reach is moderately unstable as evidenced by bank
erosion, bed scour and some bed aggradation. As a result, Robinson Creek is transporting an
excessive load of sediment to areas of the channel downstream of the project site and to Cane
Creek. A lack of riparian buffer and unstable streambed has also led to poor aquatic habitat.
Restoration and enhancement activities proposed will stabilize the channel, significantly
diminish bank erosion, restore aquatic and terrestrial habitat and establish a diverse riparian plant
community.
The upstream portion of the project begins at a culvert below Mills Gap Road. This section of
Robinson Creek has several areas of channel instability and streambank erosion. We will
stabilize these areas with multiple constructed riffles and bioengineering measures. The buffer
area will be re-planted with native riparian vegetation. Offline Reach 1 starts immediately
downstream of the first project section of Robinson Creek and ends below the confluence of a
280 LF unnamed tributary and Robinson Creek as shown on the Tributary Reach sheet. This
reach is eroding the right stream bank/hillslope and is causing mass wasting along most of its
length. The left stream banks along this reach are regularly mowed, and the lack of deeply
rooted vegetation has produced unstable stream banks. The project will re-establish a stable
dimension, profile and pattern through this section. Restoration activities planned for the Offline
Reaches 1, 2 and 3 sections of the project will primarily consist of creating new channel
segments that are designed to direct Robinson Creek away from the toe of the right hillslope. In
turn, this will prevent further sediment loading from slope and streambank instability in this
section of the Robinson Creek corridor.
Geology
The project site lies within the Blue Ridge Belt of the Blue Ridge physiographic province of
western North Carolina. According to the 1985 North Carolina Geological Survey Map and a 1
degree by 2 degree geologic map of the Knoxville Quadrangle prepared by the USGS (Hadley,
and Nelson, 1971, Map I-654), the project site is primarily underlain by an undivided, medium to
thick bedded, largely feldspathic metasandstone with interbeds of quartz-mica schist or gray
phyllite common to the Great Smoky Group of the Ocoee Supergroup. The origin of the Ocoee
Supergroup is placed in the Late Proterozoic during continental rifting episodes (USGS Bulletin
1979). The metasedimentary rocks of the Great Smoky Group also include local beds of quartz-
feldspar pebble conglomerate, graphitic and sulfidic mica schist, kyanite- or sillimanite bearing
garnet-mica schist, and rare thin interbeds of garnet-hornblende-quartz-feldspar granofels.
Immediately south of the project area, this rock unit gives way to a category of rock associated
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
with the Brevard Fault Zone whose age is unknown. At this location, feldspathic metasandstones
and mica schists associated with the Great Smoky Group are interlayered with blastomylonite,
blastomylonitic gneiss and phyllonitic mica schists.
Soils within the proposed stream restoration areas are primarily mapped as the Udorthents series
by the NRCS in Buncombe County. The Udorthents soils on-site consist of loamy material that
is found across the Robinson Creek floodplain which is currently serving as golf fairways.
Channel Cross Section and Flow Characteristics
The proposed channel cross-sections for the various reaches on this project are shown in the
attached plan set. The proposed Robinson Creek channel was designed to crest at a flow of 300
cubic feet per second, which relates to a return interval of 1.5 to 2 years. HEC-RAS modeling
indicates that the project reach will experience average velocities during bankfull events between
4 and 6 feet per second. Stream structures will be used to direct flow to the center of the
channel, and bank revetments of bioengineering and wood will increase stability.
Design Standards
Erosion control practices, methods, and procedures described in the plans and specifications are
based on those presented in the North Carolina Erosion and Sediment Control Planning and
Design Manual.
Erosion and Sedimentation Control Measures
Erosion control methods to be used in the project shall include construction entrances/exits, silt
fences, temporary rock check dams, channel plugs, temporary stream crossings, mulch,
temporary seeding, permanent seeding, vegetative plantings, erosion control matting and bypass
pumping of flow around instream work areas. All sediment and erosion control measures are to
be installed according to the plans and specifications. When working in the stream, the
contractor shall be permitted to disturb only as much channel bank as can be stabilized with
temporary seeding, mulch and erosion control matting by the end of each workday. The attached
plan sheets include details for each of the measures listed above.
Excavation of the floodplain and channel sections outside the existing channel banks shall be
accomplished from outside the active channel whenever possible. The contractor will need to
stockpile excavated material on-site for use in backfilling the original channels. Silt fences (or a
state-approved silt sock substitute where "silt barriers" are specified) shall be used to prevent
sediment migration from the stockpiles toward the open channels. Excess excavated material
shall be hauled to a disposal area at least 50 feet away from any surface water. All graded
ground surfaces will be seeded with temporary and permanent seed, mulched and matted to
prevent erosion. Floodplains will not be matted unless they are a disturbed area sloping at
greater than 10:1 without a downstream sediment barrier. Point bars will not be matted due to
the transient nature of sediment erosion and deposition on these features.
Construction of the in-stream structures within the existing alignment and at locations where the
proposed and existing alignments intersect will take place in the live stream. Where this occurs
flow will be pumped around the active work area.
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
The work in Robinson Creek shall be divided into four sub-reaches. Reach 1 (Tributary Reach)
extends from the upstream end of the project at Mills Gap Road downstream to Station 14+50
below the confluence of Robinson Creek and the unnamed tributary. Offline Reach 1 continues
at Station 14+50 and ends at Station 22+55. Offline Reach 2 extends from Station 22+55 to
Station 29+60 which is upstream of an existing stormwater wetland. Offline Reach 3 is 597 LF
and ends at Station 35+57 below a pair of pond outfalls that do not pertain to the project.
With the exception of channel sections where aggradation has occurred, streambanks at the
project site will be graded at a 2:1 slope and re-planted with native vegetation. Constructed
riffles will be built throughout the project site to increase channel capacity and competency.
Grading on the first reach will consist of minor bank sloping and the installation of a geolift at
Station 12+00. A floodplain bench will be excavated along the middle of the reach to increase
flood conveyance and reduce flood velocities throughout the reach. Construction activities in the
Offline Reach 1 section consists of excavating the first in a small series of new channel segments
designed to direct flow away from the toe of a hillslope. The design is also intended to preserve
most of the existing mature trees adjacent to Robinson Creek in the project area. These channel
segments continue downstream and are shown in the plan details for Offline Reaches 2 and 3.
Over the course of time, land disturbing activities on-site have resulted in Robinson Creek
gradually undermining the hillslope. This has resulted in unstable banks and excessive sediment
loading downstream. Where this occurs in the existing channel or connections to sections of new
channel have to be made, a temporary barrier will be set in place above the construction area and
water pooled above this barrier will be pumped around the area. While stream flow is pumped
around the work area, intersections with the existing channel will be modified to connect with
the new alignment. The pump and barrier will be removed when the area is stabilized.
A series of temporary rock check dams shall be installed at the following locations:
• Station 6+12,
• Station 2+63 (UT),
• Station 14+18,
• Station 22+21,
• Station 30+20, and at
• Station 35+43
The contractor shall be responsible for inspecting the temporary rock check dams on a daily
basis and cleaning or repairing them as needed. The contractor shall be required to remove
sediment from the check dams once the depth of sediment reaches 12 inches.
Land disturbance beyond the limits of the project shall be kept to a minimum. Existing trees
adjacent to the creek shall be preserved to the extent feasible. Trees not marked for removal on
the plans shall be protected.
Vegetation
The floodplain and banks shall be planted with a combination of herbaceous and woody riparian
vegetation. A planting typical drawing is included in the plan set. All disturbed ground will be
planted with the appropriate seed mix upon reaching final grades. Seeded areas will then be
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Robinson Creek Restoration
Asheville, North Carolina
June 16, 2008
mulched and, on stream banks where higher velocities are expected, coir matting will be
anchored over the mulch and seed. The floodplain bench and the slope from the back of this
bench up to existing ground (terrace slope), will also be seeded and mulched.
RiverLink has contracted with Equinox Environmental Consultation and Design, Inc. (Equinox),
to provide a planting plan that details planting quantities for woody and herbaceous material as
well as seed mixtures for both temporary and long-term ground cover. The planting list below is
an example of planting detail Baker typically provides for other local and state clients.
RiverLink will coordinate with Equinox to ensure the planting plan developed for the Robinson
Creek project is meets the state guidelines for planting densities at stream restoration projects.
Due to the relatively flat existing ground we don't believe that overland flow will cause erosion
problems on these terrace slopes after being seeded and mulched. However, if a problem does
arise we will direct overland flow to a central location using standard erosion control practices in
the North Carolina Erosion and Sediment Control Planning and Design Manual. These erosion
control measures would entail creating a temporary diversion (6.20. 1) where storm flow will be
conveyed across the top of the terrace slope to the flood plain bench using a temporary slope
drain (6.32) or a riprap channel (6.31).
[Table 1. Proposed Bare-Root and Live Stake Species
Stream Restoration and Enhancement Areas- Zone 1 (>15' from top of bank)
Persimmon Diospyros virginiana
Tulip Poplar Liriodendron tulipifera
Green ash Fraxinus pennsylvanica
Willow Oak Quercus phellos
Swamp chestnut oak Quercus michauxii
Blackgum Nyssa salvatica
Alternate Species
River Birch Betula nigra
Sugarberry Celtis laevigata
Redbud Cercis canadensis
Flowering dogwood Cornus florida
Southern red oak Quercus rubra
Red Maple Acer rubrum
Witch Hazel Hamamalis virginiana
Alternate-leaved Dogwood Cornus alternifolia
Stream Restoration Buffer- Zone 2 (<15' from top of bank)
Silky dogwood Cornus amomum
River Birch Betula nigra
Dog Hobble Leucothoe fontanesiana
Silky willow Salix sericea
Page 5
Robinson Creek Restoration
Asheville, North Carolina
June 16, 2008
Elderberry Sambucus canadensis
Alternate Species
Ninebark Physocarpus opulifolia
Black haw viburnum Viburnum prunifolium
Canada Hemlock Tsuga canadensis
White Pine Pinus strobus
White Oak Quercus alba
Pignut Hickory Carya glabra
Cherry Birch Betula lenta
Black Cherry Prunus serotina
Shrubs
Possomhaw Viburnum cassinoides
Black Huckleberry Gaylussacia baccata
Mountain Holly Ilex Montana
Buffalo Nut Pyrularia pubera
Rosebay Rhododendron Rhododendron maximum
Mountain Laurel Kalmia latifolia
Dog Hobble Leucothoe fontanesiana
Swamp Azalea Rhododendron viscosum
Smooth Azalea Rhododendron arborescens
Yellow Root Xanthorhyza simplicissima
Cinnamon Clethra Clethra acumunata
Mountain Hydrangea Hydrangea arborescens
Southern Bush Honeysuckle Diervilla sessilifolia
Hardback Spirea tomentosa
Streambanks (Live Stakes)
Silky dogwood Cornus amomum
Silky willow Salix sericea
Elderberry Sambucus canadensis
Note: Species selection may change due to availability at the time of planting.
Table 2. Riparian Buffer, Native Seed Mix (application rate of 15 lbs/acre)
Scientific name Common name Percent of Mixture
Scirpus cyperinus Bull Rush 5%
Agrostis alba Redtop 15%
Carex vulpinoidea Fox Sedge 10%
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
Elymus virginicus Virginia Wild Rye 20%
Juncus effisus Soft Rush 5%
Panicum clandestinum Deer Tongue 10%
Polygonum pennsylvanicum Smartweed 5%
Bidens frondosa Beggers Ticks 5%
Coreopsis lancolata Lance leafed Coreopsis 15%
Cassia fasciculata Partridge Pea 5%
Verbesina alternifolia Wingstem 5%
Temporary Seed for all areas of
disturbed roLmd
Rye Grain (fall, winter; 130 lbs/acre) Secale cereale 100
Browntop Millet (spring, summer; 45
lbs/acre)
Brachiaria ramosa
100
Maintenance Plan
All temporary erosion and sediment control practices shall be evaluated for stability and
operation by qualified personnel on a daily basis. Any necessary repairs shall be performed
immediately to maintain all practices as designed.
For questions about this plan or to discuss sediment control issues during construction, please
contact the project manager:
Micky Clemmons
Baker Engineering NY, Inc.
797 Haywood Road, Suite 201
Asheville, NC 28806
[phone] x2002 or 828-734-7445
References
Hadley, J.B. and Nelson, A.E., 1971, Geologic map of the Knoxville quadrangle, North Carolina,
Tennessee, and South Carolina: U.S. Geological Survey, Miscellaneous Geologic Investigations
Map I-654, scale 1:250000. http•//njzmdb ups aov/Prodesc/proddesc 9432.htm.
North Carolina Geological Survey, 1985, Geologic map of North Carolina: North Carolina Department of
Natural Resources and Community Development, scale 1:500000.
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
be applied throughout these reaches as well.
14. The new channel sections shall be stabilized with in-stream structures, erosion control
matting, seed, and transplants before turning water into these sections. Compacted soil
channel plugs shall be installed in areas where the new channel diverges from the original
channel, and the original, abandoned channel sections will be backfilled.
15. Earthwork shall be staged such that no more channel will be disturbed than can be stabilized
by the end of the work day or before flow is diverted into a new channel segment.
16. Dewatering of off-line channel sections is expected to be minor. Any water pumped during
dewatering operations in the off-line sections will be diverted through a sediment filter
before being discharged into the downstream reach. The pumping detail outlines this
procedure.
17. Excess soil materials will be stockpiled outside the floodplain in the staging areas, with silt
barriers installed on the stream (or downslope) side(s) of the base of the stockpiles and
maintained when sediment has accumulated above one third of the height of the silt barrier
and/or it has failed. This excess material will be hauled outside the conservation easement or
used to backfill abandoned channel before demobilization.
18. The flow diversions and stream crossings will be removed when no longer needed and the
banks in these areas stabilized with seeding and matting.
19. Bank and floodplain vegetation, including brush materials and live stakes, will be installed
during dormant season, November to April.
20. Construction entrances, staging areas and silt fences will be removed once planting is
complete or once they are no longer needed.
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Robinson Creek Restoration June 16, 2008
Asheville, North Carolina
General Construction Sequence
Construction shall be performed in general accordance with the following sequence:
1. The property encompassing this stream restoration project belongs to the Central Park
development. This property and its facilities are available to the public who are interested in
purchasing property or are already property owners, for use on a daily basis. Extreme
caution must be taken to protect the general public using these facilities.
2. Construction activities will be under public scrutiny and scrutiny of the developers; therefore,
the utmost care should be taken to minimize unnecessary ground disturbances and tree
removal and protect water quality.
3. All walking trails disturbed to accommodate construction activities shall be repaired and re-
opened as work is completed.
4. Utility locations shown on these plans are approximate. The Contractor shall have all
underground utilities within the project limits located and marked prior to beginning
construction.
5. Access to work areas shall be from Mills Gap Road onto the Central Park property through
an entrance to the Brookwood Golf Course off Weston Road. Upon mobilization of
equipment and materials to the site, access to work areas shall be along a path designated by
the landowner and it shall be marked prior to equipment moving to the site. Trucks and
equipment shall use the facility's roads to access the project reach. Where roads are not
adjacent to the stream, centralized stream accesses shall be used as shown in the plans.
6. Construction access and a staging area will be established at stations 0+00 (right), 1+50
(left), 12+00 (left), and 34+00 (left). Equipment and materials will be mobilized to these
locations.
7. Construction will proceed upstream to downstream. Temporary sand bag coffer dams will be
installed upstream of each work area and flow in the work reach will be diverted with a pump
and piping. The length of each diversion will be approximately 200 to 700 linear feet.
8. A gravel "construction entrance" that consists of class A stone, at least 50 feet in length, shall
be incorporated into every access point that connects to a public road.
9. Temporary check dams shall be installed as shown in the plans. Temporary check dams shall
be removed when grading work upstream has been completed.
10. Temporary timber mat stream crossings may be installed at locations shown on the plans.
11. The clearing and grubbing required within the grading limits shall be performed so as to limit
sediment migration off-site. Logs and root wads from trees larger than 10 inches in diameter
shall be stockpiled for use as in-stream structures. In areas where new channel will be
constructed salvageable native vegetation (doghobble, rhododendron, yellowroot, etc.), mats
or individual plants will be harvested for transplanting. These mats will be excavated and
moved to the banks of the new channel sections.
12. Work in Reach 1 (Station 0+00 to 14+50) will be limited to placement of in-stream grade
control structures, minor bank grading, planting and some removal of bridge debris in
Robinson Creek.
13. Activities for Offline Reaches 1, 2, and 3 will involve both enhancement to the existing
channel and creation of new off-line channel. Flow diversions will be staged according to
lengths of sub-reaches and site constraints. See the pump around detail for a more detailed
explanation of flow diversion. Grade control structures and bank stabilization measures will
Page 8
Robinson Creek Restoration
Asheville, North Carolina
Figure 1. Project Location
June 16, 2008
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LEGEND • D re areal photgnpl -- M06
Pr,D*t Site Map
Proiect Reach. Proposed Easement Bo.usdarr Robinson C reek Restoration
Buncombe Counh•, INC
Parcels
fa?tl
Page 10
ATTACHMENT C. UPDATED FINANCIAL RESPONSIBILITY FORM
FINANCIAL RESPONSIBILITY/OWNERSHIP FORM
SEDIMENTATION POLLUTION CONTROL ACT
No person may initiate any land-disturbing activity on one or more acres as covered by the Act before this form and
an acceptable erosion and sedimentation control plan have been completed and approved by the Land Quality
Section, N.C. Department of Environment and Natural Resources. (Please type or print and, if the question is not
applicable or the e-mail and/or fax information unavailable, place N/A in the blank.)
Part A.
1. Project Name Robinson Creek Restoration Project, a N.C. Clean Water Management Trust Fund
Qroiect
2. Location of land-disturbing activity: County Buncombe City or Township Asheville
Highway/Street Mills Gap Rd & Weston Rd Latitude 35.480839 °N Longitude 82.491547 °W
3. Approximate date land-disturbing activity will commence: August 11, 2008
4. Purpose of development (residential, commercial, industrial, institutional, etc.): Clean Water
Management Trust Fund Project for mitigation of stream impacts in the watershed.
5. Total acreage disturbed or uncovered (including off-site borrow and waste areas): 7 Acres
6. Amount of fee enclosed: $455.00 . The application fee of $65.00 per acre (rounded up to the next acre) is
assessed without a ceiling amount (Example: a 9-acre application fee is $585).
Has an erosion and sediment control plan been filed? Yes No Enclosed X
Person to contact should erosion and sediment control issues arise during land-disturbing activity:
Name Jacob McLean. PE E-mail Address imclean(a?mbakercorp.com
Telephone [phone] x2007 Cell # 828.545.3865 Fax # [phone]
Landowner(s) of Record (attach accompanied page to list additional owners):
KDG Development, Inc.
Name Telephone
Fax Number
1059 Columbine Rd. same
Current Mailing Address Current Street Address
Asheville NC 28803 _
City State Zip City
State Zip
10. Deed Book No. 3934,1158 Page No. 463, 361 Provide a copy of the most current deed.
Part B.
Person(s) or firm(s) who are financially responsible for the land-disturbing activity (Provide a
comprehensive list of all responsible parties on an attached sheet):
RiverLink riverkeeper(a)riverlink. org
Name E-mail Address
P.O. Box 15488 170 Lyman Street
Current Mailing Address Current Street Address
Asheville North Carolina 28813 Asheville North Carolina 28813
City State Zip City State Zip
Telephone [phone] x114 Fax Number 828-253-6846
2. (a) If the Financially Responsible Party is not a resident of North Carolina, give name and street address
of the designated North Carolina Agent:
Does not apply
(b) If the Financially Responsible Party is a Partnership or other person engaging in business under an
assumed name, attach a copy of the Certificate of Assumed Name. If the Financially Responsible
Party is a Corporation, give name and street address of the Registered Agent:
Name of Registered Agent
Current Mailing Address
City
E-mail Address
Current Street Address
State Zip City
Telephone Fax Number.
State Zip
The above information is true and correct to the best of my knowledge and belief and was provided by
me under oath (This form must be signed by the Financially Responsible Person if an individual or his
attorney-in-fact, or if not an individual, by an officer, director, partner, or registered agent with the
authority to execute instruments for the Financially Responsible Person). I agree to provide corrected
information should there be any change in the information provided herein.
Hartwell Carson
Type or print name
Signature
French Broad Riverkeeper, Project Administrator
Title or Authority
-1y--7 - a
Date
a Notary Public of the County of &Gv7l! Z6 yn i
State of North Carolina, hereby certify that (o+? appeared
personally before me this day and being duly sworn acknowledged that the above form was executed by
him.
Witness my hand and notarial seal, this day of , 20?
Annette R ::t? n Notary
SeaNatary Public
z Z) /,j
Buncombe Cour;ty, NC My commission expires
L y COmmission Expires Play 1 q 20 13
RiverLink
P.O. Box 15488
Asheville, NC 28813-0488
Date 16- 21- 0 $
Re: Robinson Creek Restoration and Enhancement Proiect
I, Hartwell Carson, French Broad Riverkeeper, do hereby authorize Mr. Jacob McLean or Mr.
Micky Clemmons or other employees of Michael Baker Engineering, Inc. to act as "Agent" on
behalf of RiverLink for permitting and engineering services in support of stream and riparian
enhancement activities outlined in the accompanying pre-construction notice. Specifically,
employees of Baker may take those actions necessary to obtain environmental permits from the
U.S. Army Corps of Engineers.
Stream and riparian enhancement work proposed for Robinson Creek will consist of grading
stream banks, constructing several sections of new channel, and installing a series of grade
control structures to improve channel hydraulics. All work within the project area is designed to
restore channel and floodplain habitat and improve channel stability along the reach of Robinson
Creek. Stream banks will be matted and armored in sections to prevent further erosion as the
channel and riparian vegetation become established. The restoration project will also include the
creation a new 1,300 linear foot section of stream that is designed to prevent further introduction
of sediment into the stream from the western hill slope that is failing as a result of the existing
location of the channel. Riparian enhancements will include removal of exotic invasive species
and the conversion of the existing golf course into native riparian floodplain habitat within the
project easement. The floodplain will be replanted with native tree and shrub species.
This work will be completed with the use of track-hoes with hydraulic thumbs and dump trucks to
haul materials at the site.
rVk_Z__,
Hartwell Carson
RiverLink
French Broad Riverkeeper
ATTACHMENT D. CENTRAL PARK DEVELOPMENT CALCULATIONS
FROM DAVIS CIVIL SOLUTIONS, P.A.
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Engineering/Planning a Site/Inframfow Lure
134-A Charlotte Highway • Asheville, North Caroliaa 28803
828.299.9447 PH • 828.299.9449 FX • info®civsoLcom EMAIL
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HydroCAD® 7.10 s/n 003655 © 2005 HydroCAD Software Solutions LLC 9/24/2008
Subcatchment 1S: Runoff
Central Park Offsite #1, 1-yr. Storm Event (Pre-Construction)
Runoff = 1.46 cfs @ 12.25 hrs, Volume= 8,831 cf, Depth> 0.29"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs
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Area (ac) CN Description
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Central Park Offsite#2, 1-yr Storm Event (Pre-Construction) . Type 11 24-hr Rainfall=3.50"
Prepared by (enter your company name here}
HydroCAD® 7.10 s/n 003655 © 2005 HydroCAD Software Solutions LLC 9/25/2008
Subcatchment IS: Runoff
Central Park Offsite #2, 1-yr. Storm Event (Pre-Construction)
Runoff = 1.86 cfs @ 12.15 hrs, Volume= 8,881 cf, Depth> 0.29"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-20.00 hrs, dt= 0.05 hrs
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Area (ac) CN Description
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Runoff = 1.38 cfs @ 13.59 hrs, Volume= 26,023 cf, Depth> 0.10"
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ATTACHMENT B. UPDATED PLANSET
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