20141037 Ver 1_More Info Received_20141030

E
McGill
A S S O C I A T E S
NC DENR DWR
401 and Buffer Permitting Unit
1617 Mail Service Center
Raleigh, NC 27699 -1617
RE: Beetree Creek Bank Stabilization
Buncombe County, NC
DWR Project # 14 -1037
To Whom It May Concern:
P -�/
OCT 3 0 2014 i .1
We have received comments for the referenced by way of letter dated October 17, 2014 from
G. Langdon Davidson in the Asheville Regional Office. We hope this letter and related
attachments will satisfactorily address all the outstanding issues. Below are numbered
responses to each comment contained in the letter:
1. Registered Agent: We checked with the Gods Way Church and Mr. Fred Hyatt is not
known to or affiliated with the church. The Trustee and Deacon of the church is Mr.
Billy J. Wilson. Attached is a signed form labeled Site Access Agreement (Attachment
1), in which Mr. Wilson designates Pastor Joel Burton at the responsible party for
making decisions for the church.
2. Gravel Bar Removal: The existing gravel bar in the vicinity of Goss Section 5 has formed
as a point bar in response to a channel shift upstream caused by the severe bank
erosion. As a result of the proposed project (actually a goal of the proposed project),
the bend in the stream around this gravel bar will be softened and slightly reversed,
causing the formation of a point bar on the left side of the channel instead of the right
side. The term "removal" was a poor choice of words to describe the proposed activity,
a more accurate description would be that the gravel will be modified or shifted in this
area. Examination of Cross Section 5 (provided in the PCN) shows that there will be
essentially no change in bankfull cross sectional area between pre and post -
construction channel dimension. Based on XS-5 the change in cross sectional area pre
to post will be + 1.25 sq. -ft. Total post construction cross sectional area at this location
will be approximately 90 sq.-ft.. The NC State regional curve for the mountain region
indicates streams with similar drainage area ( +/- 14 sq. -mi.) would have mean cross
sectional area of roughly 125 sq.-ft. As it turns out, Beetree Creek, upstream of the
Project Site, is a data point on this curve and this point falls below the curve. This,
combined with the fad that there is at least one impoundment upstream (that might
provide some peak flow attenuation), and that the site has a broad, accessible
floodplain, provides sound verification for both measured and proposed cross sections
throughout the project reach.
Environmental o Planning 9 Finance
McGill Associores. P.A. - 3'64 RominRer Road. Banner Elk. North Carolina ?S604
Office: 823 -297 -6946 - Far: S28 -20' -I98_

McGill
�a
A S S O C I A T E S x:
3. Wetland Question: Yes, the area shown is the only wetland area within the ProjectSite.
This area was discussed with the USACE during a field visit on.sitel9 -16 -2014 attended
by Tim Fox, Andrea Leslie, and Tasha Alexander.
*• t , t n ^j
4. Flow Diversion and Work in the Dry: Beetree Creek at the Project •Site`is toowbig to.=
pump so the creation of a "dry' work area will be accomplished •by'shifting,flow'aWag'
from the immediate work zone. The project will occur in two steps:'
a. Upstream Section (Boulder -Toe Area)
I. Rough grade left bank to establish area of proposed shifted channel,
this will be accomplished by working, f orri'tFie'left bank; starting at
the downstream end of this area and working upstream: , -
ii. Create a non-erodible berm or install a nonzerodible-bardert(Jersey
barrier or similar) to shift flow Into the new channel area and away
from the proposed boulder -toe area along the'right bank'
Ill. Construct boulder toe with soil lifts above as shown on the plans.
r ' iv.. Install two J -Hook rode vanes, It will'not be'possible to construct these
two structures entirely in the dry. f -
" b. Downstream Section (Left Bank Stabilisation Area) '.
I. Create a non - erodible berm -or- install a non-erodible barrier'(Jersey
barrier or similar) to shift flow away from the left bank.
'
Ii. Add boulders to,reinforoe undercut bank-irea, shape left°bank and
4 channel to move thalweg,towards center of channel:
lL.-Stabiliie •'disturbed areas with coir chat 40. or 'similar; seed with
temporary erosion control mix and overseed with native riparian seed
mix (ERNST 304 or similar): • ^ - F• _ : -
r.
5. Plan Detail and,Cross�Section: A.symbol1of the boulder=toe was not included on the
- Plan, View drawings so as riot to obsaire,the contour labels., We did indude a note that
references the. boulder -toe detail. and Cross Sections. This. comment -was discussed
with DWR staff and no additionahinformation is- needed.
6. ',Scour at Base of Boulder- ToeWaII: The two J -Hook vanes.willhdMect the °thalwq away
" , ,from'thesboulder -toe wall and, to a large extent; prevent-scour. We`wilf add a ,note to
the; plans ,W.severaCadditional,bwlders;Wbe placed next to,the'bouider- -toe to create
an irregular,edge'and further minimize scour potential. (see Attachment, 2)
r, r 7. . Detail and Success - Criteria 'for "live Staking: 'The Boulder. Toe Stabilization detail
' .provides, construction.notes4br live stake installation,. we All:add- to,these notes to
i:. 'lid" Jndude t(or�.referenee) a 'specification 'ind -the' minimum number Wlstakes to be
installed:`WedWll,;alsotindude the following.Monitoringmand Success Criteria to the,
projects +documents:(see,Attachment;3) .;: '� - , e '
- a: L Monitoring'and,Success Criteria for'Project Plantings�4' — - . _�
z..Y• - t : fit Monitoring:�Visdal, monitoringr-of the, stabilization project shall be,
'conducted:at'aaminimum - of t quarterly for the;flrsfyeaP of 2- bankfull
events (whichever is longer), and thentannWilyluntii the "site is`stable
E- a: v:ir- o:n'mentaI •' Prlannina F=ina•n°'cse-1
Me•Gill, 4sioeiare3 PA • S'64 Ronnngei Rood Biinnei Elk Voirh Caiol+nd-0V604
`Olin e ' S. N- `9' -6046 • Foi 'Sc'R- 29'498"

McGill
A S S O C I A T E S
.;;i'
(particularly after storm events) and vegetation is successful (see
- AkcessT,criteria)�, � Any. ,failures -of stnictures, ,stream banks, or
wegetatiomvuill;bereporteci +to Asheville Re gional,Off'im,cyf DENR DWR.
• - 4
Ii. Success Criteria: Minimum 8096 cover for, herbaceous species and
minimum 320 stems;per,acre.survivaffor woody species.
Left Bank Revegetation: Our-understanding,is that this comment applies to the'left
bank area, in the vicinity,. of XS-5. Currently this, areas. Is grassed with several larger
mature trees scattered such that during the summer months` there is ,full canopy
coverage. The church currently mows this area and1iii4ied by church:members'and
children on a regular basis. The proposed plan calls for stabilization,of disturbed areas
with,,grass, over - seeded with a °native,d rian seed mix. We,believe this specification
will return the area to.its.current vegetated state with,the added benefit,of•additional
native species along the,immediate stream bank. This particular area is very important
to the church and they have specifically requested -that it remain -ac essible'to its
members.
If you have any questions regarding this information,or need additional information please call
me at 828 -297 -6946, thank you.
Sincerely,
zJo s
Director of Environmental Services
cc: Ed Williams, NC DWR
Tim Fox, NC DWR
Tasha Alexander, USACE
Andrea Leslie, NCWRC
Joel Burton, Gods Way Baptist Church
Greg Isreal, Buncombe County
Mark Cathy, McGill Associates
Environmental Planning Finance
McGill 4 vsac tares PA - 3 "64 Romin¢eo Road Banner Elk Not rh C'ar olrnd _'1604
Omee &18-29- -6946 • Fax (2.S- 297- 19.E -'

IV
Site Access Agreement
as a- Trustee an dDeacomol.13od'sWay Baptist Church am in
`hill'adriefniht with the Site Access Agreementfor the Bee Tree Creek Project. The
ctiurchi has voted and agreed to allow Buncombe Countyand agencies designated by
Buncombe Cbunty'td tisive'accets'cf�Bee-Tree,Creek4actoss our property. We also
understand that the project requires grading and use,df our property and are'in
I-aireenierit'fbrthfi-ptojimcito move fbrwird,iiiin,iorebriieiit,' and 'specifications spelled
out in the plans. ',We also give bur�pistqr Joel Burtoh'ifie fighko, Make,dbcisions for the
church as "a as he remains our'Pastor.
ATp�CN►"I'ENT

ATTACFUvIENT 2
N 0 co CD C114
Ln Ln Ln .d-
Pro
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Reconst-ucted
Riqht Bank
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RECONSTRUCTED RIGHT BANK
BEETREE CREEK
McG
TYPICAL SECTION
BANK STABILIZATION
SEPTEMBER 2014
ASSOCIATES
REVISED: OCTOBER 27, 2014
BUNCOMBE COUNTY
ENVIRONMENTAL SERVICES
NORTH CAROLINA
3764 ROWUNGER RD BANNER aX, NC 28604 pH, (Ug) 297-&%

Erosion Control Mat
(See Notes)
- -- ------------ - - -� -�
0
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a
Existing
Bank
Cross- section
Dead Stout
Stakes
Construction Notes:
Boulder Dimensions Table 1. Grade back streambank to allow access to toe of slope, create a berm using non-
2 Description Dimension erodible materials to isolate the work area to prevent sedimentation of riper.
Boulder Length 6
4 -''
Boulder Width 2 -6 2. Outer edge of boulder wall and top elevation of boulder wall will be field located
by engineer or designer.
♦ Boulder Thickness 1 -2'
'�y` _ _
Top of Bank I Footer rocks for boulder wall shall•be installed 2' below streambed unless bedrock
/ VI is encountered.
4. Geotextile non -woven filter fabric (Mirafi 1100N or similar) ,shall be installed
I s 11 between boulder wall and soil bank, washed ballast stone (3 -6 ") shall be placed
♦ behind boulder wall to fill voids.
I ♦
5. Construct boulder wall to deigned elevation; wall slope should be roughly 0.5:1.
Temp. Bench for
Construction, Access
Approx.
Streambed Elev.
. :12 " -16..
$0,1 Lift sleight -
31-41
Non -woven Filter Cloth
(See Notes)
Live
Stakes
6. Place coir mat;geotextile (900 Coir Mat or equivalent) over header boulder with
Coir Mat Geotextile back edge anchored behind boulders using dead stout stakes. Set batter board with
desired soil lift face height (12 " -16 ") along front edge and drape coir mat
Wrapped Soil Lifts overhanging board. Place topsoil fill to designed vertical depth (12 " -16 ") and tarnp
(See Notes) firmly to 85 -90 percent standard Proctor density (ASTM D698). Pull coir mat back
to existing slope face covering soil lift and staple at 2 -foot 'intervals. Repeat process
until designed soil lift section is complete. Maintain 2 :1 slope through soil lift
section based on soil lift height and setback distance'between lifts.
Approx. Bankfull' 7. Add topsoil fill above soil' lift section in compacted'layers to tie into top bank
V elevation; maintain,2:1 slope. Stabilize with erosion control mat (Double sided
Straw Erosion Blanket) and staked according to manufacturers recommendations.
Seed topsoil fill, slope and soil lift section with erosion control mix and overseed
with Native NC, Mountains Riparian seed mix (ERNST seed mix #304 or similar)
8. Live stakes shall be soaked in water 2448 hours prior to installation: Live stakes
shall be planted in the dormant season (October 1 through May 1). Live stakes to be
tamped into upper edge of lift face at right angles to the slope, minimum depth of
18" with 6" of stake end protruding from the, ground. Liye stakes should be, spaced at
j
Approx. 2' intervals along soil lift horizontal rows.
Normal Flow Live Stake Specifications
Live stakes shall be dormant cuttings of one or more of the following
species with median dimensions of 1/2" diameter and 2' length:
•�• Cornus amomum,
�..� Cornus sericea
Approx. Salix sericea
1 - — Streambed Salix cotletii
Salix discolor
Total # of lave stakes to be planted is approximately 210.
Ballast Rock Backfill
Install Footer Boulders
Approximately 2' Below Streambed
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ATTACHMENT 3