20010442 Ver 1_COMPLETE FILE_20010326

3
City of
Wilmington
North Carolina
Mr. John I
NC Divisio
4401 Reed
Raleigh, N
Dear Mr. I
SUBJECT: l
1, 2002
i of Water Quality
Creek Road
27607
Development
Services
305 Chestnut Street
PO Box 1810
Wilmington, NC 28402-1810
[phone] tdd
r? LS Q7 R . ,
iY. bli {
BRANCH DRAINAGE REPAIR PROJECT (DWQ # 010442)
Please be advised that the City of Wilmington no longer wants to pursue the Marsden
Branch Drainage Repair Project (DWQ# 010442). Consider this project withdrawn. We
will resubmit a new application and fee at a later date.
Sincerely, i
e e obles, E.I.
Staff Engineer
Enclosures (7)
Community Development Planning Engineering Development Management
[phone] telephone [phone] telephone [phone] telephone [phone] telephone
[phone] facsimile [phone] facsimile [phone] facsimile [phone] facsimile
173
City of
Wilmington
North Carolina
March 19,
1 z)o e (
0 ( b'4 u(d--
NeuJ dDevelopment
Services
305 Chestnut Street
PO Box 1810
Wilmington, NC 28402-1810
[phone] tdd
John Dornep
Wetlands / 401 Unit Supervisor
NC Division' of Water (?uality
1617 Mail Service Center
Raleigh, NC 7699-1617
Dear Mn Dorney,
I
SUBJECT: THE MARSDEN BRANCH PROJECT, DWQ 010442
i
I am writing 1n response to your letter dated February 28, 2002 concerning The City of Wilmington's
Marsden Branch Drainage Repair Project. Dave Mayes with the City Stormwater Management office and I
met with Todd St. John from your office, Joanne Stienhouse from the DWQ Regional Office, and ;Angie
Penncok froT the Wilmington office of the Army Corps of Engineers on January 16, 2002 to discuss our
options for this project. One of the options that was discussed was the use of turf reinforcement mats to
stabilize the 1.5H:1V slopes in a similar fashion as the articulating concrete blocks that were originally
proposed for the channel cross section. We are currently in the process of trying to determine whether the
use of turf reinforcement mats is feasible for the existing site and soil considerations. There are concerns
with the ability of turf reinforcement mats to withstand continuous flow at the relatively steep side slopes in
what is a very sandy, highly erodible soil. The site topography and close proximity of existing residences does
not allow a flatter side slope.
The use of tuff reinforcement mats would allow vegetation growth, and would most likely req*e the
installation of I sod for quicker root development to anchor the system. Per the January 16th meeting and a
February 11, 2002 telephone call with Todd St. John, this system would not be considered as bank-to-bank
hardening. It is our understanding that if a design solution, such as turf reinforcement mats, can be used, that
there will be no requirements for mitigation, nor will a FONSI or a ROD be required.
I
4
The City is still committed to completing this project, and we are still investigating all of our options at this
time. It is my goal that we have a solution that is agreeable to all parties within the next few weeks. If you
have any questions please call me at [phone].
Sincerely,
Jeffrey
Staff F
cc:
Community Developn
[phone] telephone
[phone] facsimile
k. ?M-L?
City of Wilmington Stormwater Manager
City of Wilmington Capital Projects Manager
Planning Engineering Development Management
[phone] telephone [phone] telephone [phone] telephone
[phone] facsimile [phone] facsimile [phone] facsimile
O?O? w AT ?RpG `
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o ?
CERTIFIED MAIL -
Mr. Jeff Nobles
City of Wilmington
P.O. Box 1810
305 Chestnut St.
Wilmington, NC 2E
Re: New Hanover
DWQ 010442
Dear Mr. Nobles:
On December
bank hardening and cu
incomplete and was be
have not received this,
letter, we will consider i
as withdrawn. Please I
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Gregor y J. Thorpe. Ph.D.
Acting Director
Division of Water Quality
February 28, 2002
TURN RECEIPT REQUESTED
neering
8, 2001 the Division of Water Quality wrote to you concerning your plans to construct bank to
rerting 541 streams in New Hanover County. This letter informed you that the project was
ig placed on hold until the additional information outlined in the letter was supplied. To date, we
dditional information. Unless we hear from you in writing within 3 weeks of the receipt of this
iat you no longer want to pursue this project and we will retire the file and consider the application
e aware that reapplication for this project will require a Certification fee and new applications.
Please call Mr. Mike Horan of my staff at 919-733-3574 if you would like to discuss this matter.
Sjpcerely yours,
OF W AP- I Michael F. Easley; Governor
q William G. Ross Jr., Secretary
0 North Carolina Department of Environment and Natural Resources
> Gregory J. Thorpe, Ph.D.
d t Acting Director
Division of Water Quality
December 28, 2001
d
Mr. Jeff Nobles
City of Wilmingto' Engineering
PO Box 1810
305 Chestnut Street
Wilmington, NC 28402
Dear Mr. Nobles:
The Div;sion of Water Quality has reviewed the additional information, received November 30,2001,
regarding the Environmental Assessment (EA) and application for the subject project. It is clear from the
correspondence Kt you intend to proceed with the design that calls for bank to bank hardening and culverting 541
feet of stream. Based on this design, 541 feet of stream mitigation will be required. Also, this Office believes that a
FONSI or ROD will be required from the State Clearing House before a 401 Water Quality Certification can be issued
since the stream impacts exceeds 500 feet.
It is my understanding that you had discussed the possibility with Mr. Todd St John this office, of using
bioengineering or'rsoft" techniques to stabilize the majority of the channel. I would like to emphasize again that the
use of these techniques could reduce the impacts below 500 feet so that FONSI or ROD would not be required. Also,
if the channel hardening and culverting could be reduced to 150 feet or lees, then no compensatory mitigation would
be required. Primarily, however, impacts to the stream must be minimized. Since the use of the "soft' techniques that
you have discussed with Mr. St. John would be considered minimization, you must provide information to show that
these techniques cannot be feasibly used for all or part of the proposed project. No information was provided in your
submittal to show that the "soft" techniques are not feasible.
As such, this Office recommends that the use 9f "bank to bank" hardening and culverting be limited to less
than 150 feet to avoid any mitigation requirements. If this cannot be accomplished then you must provide information
to show that the bank hardening is necessary.
In any evont, this Office still requires that alternatives to the hard structures be specifically explored. Also, if
the "bank to bank's hardening and culverting combined is greater than 150 feet then compensatory mitigation for
those impacts must be provided. A compensatory mitigation plan shall be required in order to have a complete 401
Water Quality Certi fication application. Finally, this Office will assume that the current plan requires a FONSI or ROD
and cannot issue a 401 Water Quality Certification until such a document is provided. This information is needed by
DWQ in order for us to decide whether this project is approvable. _
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place
this project on hold !due to incomplete information. (15A NCAC 2H.0507(a)(4)).
? Sincerely,.- /J
p2?
John R. Domey
Cc: Wilmington DWR
USACE Wilmington
Milt Rhodes
Filp rnpy
NbM
Wetlands/401 Unit 1650 Mail Service Center Raleigh, NC 27699-1650 Ph: [phone] Fax: [phone] Customer Service
1 800 623-7748
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CC I A .' \J f-r
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Mr. Jeff Nobles
City of Wilmington Engineering
PO Box 1810
305 Chestnut Street
Wilmington, NC 28402
` Kw-
December 21, 2001
Re: Marsden Branch
New Hanover County
DWQ # 010442
Dear Mr. Nobles:
The Division of Watee Quality has reviewed the additional information, received November 30, 2001, regarding the
Environmental Assessment (EA) and application for the subject project. It is clear from the correspondence that you
intend to proceed with the design that calls for bank to bank hardening and culverting 511 feet (net) of stream. Based on
this design, 511 feet of stream mitigation will be required. Also, this Office believes that a FONSI or ROD will be required
from the State Clearing House before a 401 Water Quality Certification can be issued since the stream impacts exceed
500 feet.
It is my understanding that you had discussed the possibility with Mr. Todd St. John of this Office of using bioengineering
or "soft" techniques to stabilize the majority of the channel. I would like to emphasize again that the use of these
techniques could reduce the impacts below 500 feet so that a FONSI or ROD would not be required. Also, if the channel
hardening and culverting could be reduced to 150 feet or less, no compensatory mitigation would be required. Primarily,
however, impacts to the stream must be minimized. Since the use of the soft techniques that you had discussed with Mr.
St. John would be considered minimization, you must provide information to show that these techniques cannot be
feasibly be used for all or part of the proposed project. No information was provided in your submittal to show that the soft
techniques are not feasible.
As such, this Office recommends that the use of "bank to bank" hardening and culverting be limited to less than 150 feet
to avoid any mitigation, requirements. If this cannot be accomplished then you must provide information to show that the
bank hardening is necessary.
In any event, this Office still requires that alternatives to the hard structures be specifically explored. Also, if the "bank to
bank" hardening and culverting combined is greater than 150 feet then compensatory mitigation for those impacts must be
provided. A compensatory mitigation plan shall be required in order for to have a complete 401 Water Quality Certification
application. Finally, thi? Office will assume that the current plan requires a FONSI or ROD and cannot issue a 401 Water
Quality Certification un?il such a document is provided. This information is needed by DWQ in order for us to decide
whether this project is approvable.
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place this project on
hold due to incomplete information (15A NCAC 2H .0507(a)(4)).
n R. Dorn y
a er Quality Certifi atio Program
cc: Wilmington DWQ Regional Office f
USACE Wilmingto Regulatory Field Office
Milt Rhodes, DWQ
File
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail "Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.uslncwetiands/
i
The never ending...
Subject: The never ending...
Date: Mon, 10 Dec 2001 10:05:25 -0500
From: j'Todd St. John" <[e-mail]>
Organization: DWQ Wetlands Unit
To: j'joanne.steenhuis" <[e-mail]>
CC: i'john.domey" <[e-mail]>
... Marsden Branch... DWQ# 010442...
Joanne,
I discussed t:
of geotextile
look at it...
tells me they
a ROD or FONS
show why the
him why the g
rejected the
kind of meeti:
the project o:
the soft tech
hurdle, a FON
Please see
comments, if.
thanks,
Iof I
is project with Jeff Nobles a while ago regarding the use
fabric vs channel hardening... He said that they would
if they could pull it off we'd be done... but, now he
want to proceed with the hardening, and as such, they need
and they need a mitigation plan... They also need to
eotextile is unacceptable (i.e. minimization)... I asked
otextile wouldn't work, he said that his superiors
I dea... He then discussed the possibility of having some
g to resolve this thing... in any event, we have to put
(hold again since they haven't provided any info as to why
I iques can't be used and, assuming they get over that
I or ROD w/a mitigation plan.
attached draft letter for your review. please provide
ou'd like by 12/20/01...
v
the
12/14/01 10:12 AM
O?OF W A rFRQG
r
o ?
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
December 7, 2001
Memorandum To:
From:
Subject:
As you are
this project could r
would be possible
November 30, 20C
techniques. I callei
indicated that the i
boxed us into a co
plan. I spoke with I
FONSI or ROD. A,,
hardening technigi
project back on ho
Nobles had indical
matters.
John Dorney
Todd St. John I
Marsden Branch
New Hanover County
DWQ#
aware, I had discussed this project with Jeff Nobles and we had determined that
)ssibly be achieved using soft techniques. He was supposed to determine if this
ind get back to me. Danny Smith apparently received a fax from them on
1, in which they revised their impacts numbers but still were proposing the hard
Mr. Nobles and asked why they had abandoned the soft techniques and he
lea was rejected by his superiors. It is not clear why. In any event, they have
ner where they have to get a FONSI or ROD and they have to provide a mitigation
lilt Rhodes and he said that he had indicated to them that they would need a
such, since they have not provided any information as to why these proposed
es must be used, I have drafted another letter for your signature placing the
J. I have made every effort to provide a suitable compromise in this situation. Mr.
;d that he would try to set up an on site meeting so that we can discuss these

North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-7$3-1786 (phone), 919-733-6893 (fax), hftp://h2o.enr.state.ne.us/ncwetlands/
W A rF9p?
o lii? ?
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
December 10, 2001
Mr. Jeff Nobles I
City of Wilmington Eng neering
PO Box 1810
305 Chestnut Street
Wilmington, NC 28402
Mr. Nobles:
Re: Marsden Branch
New Hanover County
DWQ # 010442 y`I, f
The Division of Water Quality has reviewed the additional information, received N embel:40, 2001, regarding the
Environmental Assessment (EA) and application for the subject project. It is Ilea from t e correspondence that you
intend to proceed with the design that calls for bank to bank hardening and cul rting 41 feet of stream. Based on this
design, 541 feet of stream mitigation will be required. Also, this Office believe that FONSI or ROD will be required from
the State Clearing House before a 401 Water Quality Certification can be is ed ifice the stream impacts exceed 500
feet. 1
It is my understanding !that you had discussed the possibility with Mr. Tod St. ohn of this Off icet of using
bioengineering or "soft" techniques to stabilize the majority of the chann . I ould like to emphasize again that the use of
these techniques could reduce the impacts below 500 feet so that a F S or ROD would not be required. Also, if the
channel hardening and culverting could be reduced to 150 feet or lesspo mitigation would be required. Primarily,
however, impacts to tflie stream must be minimized. Since the use of the soft techniques that you had discussed with Mr.
St. John would be considered minimization, you must provide information to show that these techniques cannot be
feasibly be used for all or part of the proposed project. No information was provided in your submittal to show that the soft
techniques are not feasible.
As such, this Office recommends that the use of "bank to bank" hardening and culverting be limited to less than 150 feet
to avoid any mitigation requirements. If this cannot be accomplished then you must provide information to show that the
bank hardening is necessary.
In any event, this Office still requires that alternatives to the hard structures be specifically explored. Also, if the "bank to
bank" hardening and culverting combined is greater than 150 feet then compensatory mitigation for those impacts must be
provided. A compensatory mitigation plan shall be required in order for to have a complete 401 Water Quality Certification
application. Finally, this Office will assume that the current plan requires a FONSI or ROD and cannot issue a 401 Water
Quality Certification until such a document is provided. This information is needed by DWQ in order for us to decide
whether this project is approvable.
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place this project on
hold due to incomplete information (15A NCAC 2H .0507(a)(4)).
Sincerely,
cc: Wilmington DW9 Regional Office
USACE Wilminciton Regulatory Field Office
Milt Rhodes, DWQ
Files
John R. Dorney
Water Quality Certification Program
North Parolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-7;33-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetiandst
CITY OF WILMINGTON
P.O. BCC 1810
305 cf?ptnut 6tr4*
WPM' . NOM Ca INM 28402
[phone] ft"hom
(910)34 1 I-SUI &card&
I
To. j Danny Smith
Fax:[phone] Nov 30 '01 12:02 P.01/01
City of Wilmington
Engineering
Fr *M Jeff Nobles
Fig 1 (919) 733-683
7339716
Onto 11/30/01
Roo I Marsden Branch Dralrw a Repair Pmjert CCr
O UrawA ® F4w Rwrlww 01Memo Cwmnwst © Plwr" Reply CI Nomw Recycle
mw 1 is ft inf0lwition that you requested for the Marsden Branch Drainage Repair
If you rme<d "brig also plow call me.
Fatal ProjerGt Length-S03 If
Usbrts under road cx,iv+" length - 62 If
P culvert € oth -138 If ---:> ?J --?---1
i
Ejdstirtg corn to filied ft b t form {to be removed) - 30 If
I
Total {a OWNG pnacast black lined channel -403 if
All of ttl i) s infoririation apes with the numbers given in the environmental assessment.
I
The leAoths given on the NatimtAde Permit and Narrative reffed a couple of changes that have been
made sirs the appti-StiOn was submitted. The propCSed culvert at the upstr3am end vas shorwnw,
while the inlet of the dp m culvert remained the same. The outlet for the cimmstream culvert
was ler?gtt>ened. This would explain the change in the'AfW channel length Change from 374 if to 403
If, Th? 510 H CFm" Ungth Before' v" mewured from the outlet of the existing under roadway
cull not the inlet. This is why the overall length does not match between the EA and the Nationwide
Permit iaatibtl atld Nairallve.
i
CITY OF WILMINGTON Fax:[phone] Nov 30 '01 1159 P.01f01
P.0, Bax 1810
305 Chestnut SUW
Wllmu", Nodh Cwolkm 28402 o
{910) X41,780]' feleprx7ng
Enaineerinci
(910) 3415881 fa =krds
TO: bunny Smith Fr*W Jeff Nobles
PAM 1(919) 73a4M
Pt1MlM 1919) 7339718
p- 1 4 11/30101
Ike Motoden Brach Prainsge Repair Project M
C] UrvatA 0 Far R.wsw C3 pwae* c atnm«1rt M Ptsmm RaWy 0 PMmm Recydr
I
alt Core,ri mbm Were Is the inti m ibon that you requested for the Marsden Branch Drainage Repair
Pmjea If you need SVthing else plena OWI me.
'Cotal Prl jw L&Xoh - 603 If
Existing urx* meld culvert lortgth -82 if
Proposed culvert lersgth -139 If
Euistir? corrcr+st>e filled fabric ft n (to be removed) - 30 If
total procasst brook lined ohartnel - 403 If
All of this Informiatian agrees with the numbers given in dw environmental assessment.
I
The lengths given on the Nationwide Permit and Narrative reflect a couple of changes that have bw
made s nce the application was submitted. The proposed culvert 8d the upstream end was attort ,
while ttla inlet of the dowrVxe ern culvert rem9ned the same3. The wilet for the dow am culvert
was I4. This would explain tote change in the "After" channel length change f orn 374 If to 403
If. The 510 If Channel `Leregth Sefa'e" was meawvd from the outlet of the eAsfing under roadmy
culvat, not the inlet This is why the overall lerigttt does not mach between the EA and the Nationwide
Permit ipolcatiiart and Narrative,
CITY OF W
Fax:[phone] Sep 25 '01 8:18 P.01/12
Development
Services
City of
Wilmington
North Carolina
TO
305 Chestnut Street
PO Box 1810
Wiimin9ton, NO 28402-1810
[phone] rdd
FACSIMILE COVER SHEET
. 1? h FROM jepr
0
PHONE FAX: I9r9
DATE:
IT
PHONE/FAX
TOTAL PAGES: 1
?1, b 1tes
(INOUJC3040 CCVrA SHEET
SUBJECT
? Urgent
E;Oa j Por- oss i ble- a l f e..vr1ak ? Confidential
? Waiting for your response
Cjjo,rj S?a 6 t jjL4 ?o rsde y% ? Response to your request
? For your approval
l r o' ,e- C XFor your review
? Route
Trouble with transmission
Contact:
DEVELOPMENT SERVICES
PLANNING ANO DEVELOPMENT
ZONING I DEVELOPMENT REvtEW
910 254-0900 341-3264 FAX
LONG RANGE 1 TRANSPORTATION

i 910 341-3258 341-7801 FAx
ENGINEERING
CAPITAL PROJECTS/ SURVEY
CONSTRUCTION MANAGEMENT
910 341-7807 341-55b1FAX
STORM WATER SERVicES
914 343.7477 341-7801 FAX
COMMUNITY DEVELOPMENT
j HOUSING
910 341-71336 341-7502 FAX
- CODE FNFORCEMHNT
910 341-3266 341-7802 FAX
CITY OFIWILMINGTON Fax:[phone]
Sep 25 '01 8:19 P.02/12
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Seeding
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C
C
E
Fyramate high performance turf reiat (Cerl10nt mat is Covered by U•$. Patents 15,567,087 and 5,616,399. Pyramat is a registered trademark of 310 Corporation,
02000 aP' corpora6ori Pant lm in USA
i ccu
opo-rM•too
CITY OF WILMINGTON Fax:[phone] Sep 25 '01 8:20 P.04/12
Engineering Specitications
The HIGH PERFbRMANCE T'URF REINFQRCEMENT
MAT shall be a three-dimensional, lofty, woven polypropylene
geotextile specially designed for erosion control applications
on steep slopes, water containment structures and vegetated
waterways. The matrix shall be composed of polypropylene
monofilament yarns woven into a uniform, dimensionally

? J
stable configuration of resilient pyramid-like projections. The
material shall exhibit very high interlock and reinforcement
capacity with both soil and root systems and demonstrate high
tensile modulus. The high performance TKM shall conform to
the property values listed below under dry or saturated
conditions.

.?rV
)
FL V;
R
I
j ASTM 0-4595 3,200 X 2,200 Ib/fl 46.7 X 32,1 kN/m
Tensile Sirengt t
ASTM 0-5035
9,100 X 2,000 Wit
45.2 X 29.2 kN/m
ASTM 0-4595 80% (max) 800/ (Max)
Tensile Elanga one
ASTM D-5035
)
55%. (max
55% (max)
?{$?'
t
`
u !
)
':
rk J
' 2,. •,' ' i:•l . P h
UV Resistance @ 1000 hours ASTM D-4355 80% 80%
'•.!E },',i.,,uxa Y.-.. ^Ns.i'"',?t .

'-yI • i ? i..?: :/.•. X •? ':.y ; fly . .7a'.?' !:;j'.. . ;6? •' ••''tr'
x0-
'. 11: .: ???irl .1 ?..J,'? ;• r _ •• ?r . ( ?y 1 _
Thickness ASTM 0-1777 0.5 in 12.7 mm
Resiiiencys ASTM 0-1777 80% 80°19
Mass Per Unit!Area ASTM D-5621 14 Widz 475 O/m2
around CoverFador' Light Projection Analysis 75 % 75%

Velocity
I rt-Term (Va hr)
7 Long-Term (50 firs)
Veaetater? 7.6 Met; 14 fUsec 4.3 m/sec

Unvegetated
i ,,
tsee 6.1 Mel;
10 Moo 3.0 m/sec
Shear Stress
Vegetate 10 lb/ft' 48.9 kg/m2 6 Ib/ftr 29.3 k9/m2
Unve0atated 8 Ib/ft' 39.2 kg/m2 3 N/W 14.7 kgrm2
NOTES: (I
1 Ail published values are Minimum Average Roll Mass (MARV) vAlosa
othelwr'se imitated, yleldinp a 95% confidence level. Additional property
values Milable upon request
Z values lot bath mashing and cross machine directions under dry or
saturalod 177dition$1
3 Resiliency defined os percent of original thickness retained after 3 Cycles of
a 100 psi load (690 kpd) for 60 SoConds WA tout 100... rhkknass measured
30 minutes After Toad removed in accordante with ASTM D-1777.
4 Ground Co I r Factor tepre5ents "% shade"form Lumite* Light Pt oction TOW.
5 Values obtai ad atdoWopQndenthydraulles resting laboratory.
STANDARD ROLL SIZE INFORMATION
2.59mx27.4m=71 ml
0.5ttx90ft=785ft-" =8502
9
CITY OF WILMINGTON Fax:[phone]
PYRAMAT° A ncations
Pyramat'l? handles a broad range of discriminating
biotechnical applications requiring vegetated soil reinforce,
ment and stabilization including:
A Stormwater/Drainage High Flow Channels
A Landfill Caps, Slopes & Diversion Structures
A Dam, Dike & Levee Protection
A Bank & Shoreline Stabilisation
A Geosynthetic Reinforced Earth Structures
A Vegetated Geotextile Slope Facings
A Veneer Cover Soil Stabilization
A Inlet/Outlet Protection
Ocher potential applications include:
Grassed Access Roads/Temporary Parking Areas
A Prc-grown Reinforced Vegetated Carpets
? Bioengineered "Geologs"
A Sports '11irf Protection
High Friction/High Flow Georextile Beneath
Hard Armor
A Grout-Filled Transitional
Matrix for:
• Low Flow, Pilot or
Trickle Channels
v- Outfall Protection
• Pond & Lagoon
Shorelines
?___1

Steep slope stabilization.
25 '01 8:21 P.0!
AAT® lnstallatia
The rugged Pyrarnat matrix will also absorb considerable
installation stress permitting the use of mechanical equip-
ment. The matrix will perform best when installed beneath
the soil surface.
A When used as a vegetative reinforcement rnarrix,
the product should be installed first, seeded, then
a 1/2" - I" veneer of soil placed and compacted
into the "pyra-cells."
A Light weight wheeled equipment or vibratory
tampers may be carefully utilized to facilitate
compaction. '
A Refer to the Synthetic Industries Pyramat
Installation iwtructions as a soil-filled matrix.
A For other installation requirements, please
contact Sl" Geosolutions for prompt
recommendations and on-site construction
assistance at [phone] or toll free in
the USA at (800) FIY.SDIL.
e
CITY OF WILMINGTCN Fax:[phone]
[P-e,ak Performance
Performance of Pyramatt erosion matrix has been
extensively evaluated at two renowned hydraulics
testing laboratories in the western United States.
Establishing a flow race versus time continuum,
performance (see graph below) has been quantified
using vegetated and non-vegetated mattings versus
nonreinforced vegetation and bare soil. These
studies identify the design window which provides
performance guidelines from time of installation,
transit(oning to a mature vegetated condition for
the long-term design life of the project.
Maximum recommended permissible velocities and
shear stresses for Pyrarnat are presented in the table
above. Vegetated, Pyrarnat will resist flow velocities
of up to 7.6 m/sec (25 ft/sec) at shear stresses up to
48.91tg/m2 (10 lb/ft'-).
Additionally, the resistance of unvegetated Pyrarnar
to directly applied shear stresses was measured using a
specially designed flume. The Pyramat three-dimen-
sional structure resisted the maximum shear developed
at full-flume capacity with no deformation whatsoever.
Maximum shear stress developed was approximately
39,Z kg/mt (6 Oft') at a velocity of 6.1 m/sec
(20 ft/occ).
The graph below illustrates the enhanced performance
of Pyramat high performance turf reinforcement mat
above that of conventional Btorechnkal Composites, and.
natural vegetation.

e.o

4.6
3.0
1.6
LONG-TERM
FLOW
".d upon wi- wen (W haw) apw ash.
160V4e1 uorion control WHO. eber Mill# SV41lau, Marw
GUIDELINES*
(hours)
Ns, K
Sep 25 '01 8:21 P.06/12
Vegetated T.6 m/see (20 ft/aec) 14.3 m/sec (14 tvsoo)
Unvegetated S.t m/sec (20 tt/sec) 3.0 m/sec 00 ttlsec)
SHEAR STRESS
Vepetsted 4a.9 k0/,2(1018/tt2) 29.3 ko/m?(6lbiftt)
Unveoetaled 39.2 kg/mt (a 16/ft'l) 14.7 k9/m2 (3 IMP)
S
PyramaI ,*, high
per/ornuince TAM
(HP•TRM) takes turf
reinforcement to
unprecedented levels.
7
High velocity hydraulic flume testing.
CITY OF WILMINGTON Fax:[phone]
Functional Longevity for the Ages
.19Reinforcement matrices must provide long-term perfor-
mance under adverse conditions. In aril to semiarid
regions or rites where establishment of vegetation is slow,
inadequately stabilized TRMs may undergo significant UV
degradation prior to performing their primary function.
The durable Pymmat® erosion matrix is designed to
withstand prolonged exposure in the challenging conditions
of demandiniz iobsites or inhospitable climates. Ultraviolet
stabili:era assure functional longevity when vegetative
establishment is delayed or the matrix is otherwise exposed
to extended periods of sunlight.
tion and
Some PC)
Sep 25 'O1
by
8:22 P. 0712
biodegrada-
d in soils-
to temporary and permanent loss of
polyolefins (polypropylene) absorb negligible amounts of
water, Pyramat will malntairn Its tensile propcrries under
saturated conditions with no long-term lo6s of strength via
hydrolysis.
This corrosion resistant matrix will endure as a key compo-
nent of a shoreline protection system, even In brackish or salt
water conditions. Careful polymer selection, high'strenpth,
resiliency, abrasion and puncture resistance, and unsurpassed
dimensional stability ensure these pyramids will also stand the
test of time.
?F
to
it
d
T
w
a
s?
1
cf
tc
11
CITY OF WILMINGTON Fax:[phone]
FT-he Performance Pyramid
The erosion and sediment control iridustry has rapidly
evolved Into a diverse hierarchy of cost-effective
methods and techniques, The adjacent Performance
Pyramid highlights the four primary divisions of
vegetated erosion control techniques.
In order of increasing functionality and
performance are:
A? Basic Mulching Techniques
? Advanced Mulching Techniques
Turf Reinforcement Mots
High Performance
Turf Reinforcement Mats
Sep 25 '01 8:23 P.08/12
Superior tensile properties combined with rugged
construction, durability, proven performance and
unsurpassed functional longevity clearly separate the
high survivability PyramatQO from existing TRMs.
Cdeosynthetie erosion control materials
h we risen to a new level.
b
CITY OF WILMINGTON Fax:[phone]
Pyramid Power
Pyrarnafo high performance turf reinforcement mat is a
pruciae, highly engineered product possessing the optimal
qualities for geobotanicalTeinfOTcement. Unparalleled strength
and dimensional stability in an open, three-dimensional
geotextile designed to nurture and reinforce vegetation,
makes Pyramat the ultimate "new generation" turf reinforce-
ment mat.
Part of the LandlokQ family of erosion control products,
Pyramat provides many times the strength of popular Turf
Reinforcement Mats (TRMs) currently available. The tensile
properties of Pyrarnat even exceed chose of many conven-
tional, two-dimensional gcotextiles and geogrids. Moreover,
the strength of Pyramat is distributed over three dimensions.
Direct shear and pullout testing has demonstrated that
Pyramat's three-dimensional structure has a very high
coefficient of friction with soils. A high interface shearing
resistance makes Pyramat erosion matrix an ideal material to
stabilize coast lines, embankments and landfill caps. Once
emerging roots of the developing vegetation reach the :one of
reinforcement, the resulting revegetation platform will
provide increased slope stability and erosion control on
critical cites.
P. 09/12
0
Wide width tensile
resting of Pyramat
The abrasion resistant, resilient Pyrarnat structure also
provides maximum resistance to constru ction and mainte•
nance induced stresses. Field surveys hav e demonstrated that
low strength mattings may sustain mech anical damage and
rutting from passes of maintenance (mow ing), emergency,
service and recreational vehicles.
Pyramat provides greater tensile properties than an
AASHTO M288.99", Class 1, Stabilisat ion Geotextile,
ensuring protection from both anticipate d and
unanticipated abuse.
PUBLISHED TENSILE STRENGTHS FOR GEOSYNTHETIC MATERIALS
Y
46
(3000)
w
30
ie=i
18

I WI(num average roll wmss; waft MOM tvslk Im per AM 94M
2 1MnugMmr "Iy publishes typical vatuaa
' MSM Is an aeronrm for the Amulan Assoeiatlan of State Highway Transportation Millis
n__ nr '0 n.n3
CITY OF WILMINGTON Fax:[phone]
The Matrix of Pyramids
Bl•o-tech-nl-cal coin-pos-item \ V1-o-'tek-ni-kal k'dtn•'pitr-N
\ n (1991) the synergistic, mutually beneficial anion of
I Iving plant tissue and structurally integrated geosynthetic
materials to provide permanently enhanced erosion protec-
tion and stability.
Through the years, flexible soft armor techniques have
emerged as proven and preferred alternatives to traditional
hard erosion control approaches emphasizing expensive and
unattractive rock, concrete and structural materials. Yet
many designers have been hesitant to employ environmen-
tally superior soft solutions due to concerns regarding their
retained strength, durability and performance through time,
the fourth dimension.
Focused on superior, long-term petformance, designers
at Sl's Geosolutions have created PyramatW high
performance turf reinforcement mat. This patented, three-
dimensional wovim geotextile matrix is composed of UV
stabilized polypropylene monofilament yarns woven into
a dimensionally stable, uniform configuration of resilient
pyramid-like projections.
Sep 25 '01 8:24
Using a novel and highly sophisticated
yarns are locked in place to create a un
mat which exceeds the vegetal relnforc
conventional biotechnical composites any
term strength, dimensional stability dt
longevity of a high performance geotaxtit;
The efficient geometry of Pyramat er
stabilize soils and reinforce vegetation.
ward protruding "pyra•celk" capture al
the multiple layers of gridlike "pyra-rib
surrounding soils.
In addition, close inspection of the loft
"hidden chambers" which literally- entc
high flow conditions. Pyramat high pe
Ment mat (HP-TRM) is the product for
control applications - where reinforcer
desired to replace hard armor and incrt
P. 10112
veaving process all
lue turf reinforcement
ment capabilities of
combines the long-
ability and functional
>ion matrix helps
lpward and down-
I contain soil while
' interlock with
matrix will reveal
16 soils, even under
arrnance turf reinforce,
emandin$ erosion
,nt of vegetation is
se soil stability.
CITY OF WILMINGTON Fax:[phone]
The MYster a the Pyramids
1 yr-a-mid \ 'plvc7 mid \ n [L pyramid -, pyramis, fr. Gk. of
unknown origin] (1549) 1 at an ancient massive structure
found esp, in Egypt having typically a square ground plan,
outside walls in the form of four triangles that meet in a point
at the top, and inner sepulchral chambers bt a structure or
object of similar form. i
Sep 25 '01 8:25 P.11/12
Thousands of years later, these structures remain intact.
Scholars still attempt to comprehend and chronicle the
enigmatic history, construction and often inexplicable
properties of these highly efficient structures.
Pyramids have truly stood the test of time.

Thmughour the sands of time, the word "pyramid" has
brought to mind images of strength, power, dominance and
____ _11 .L,.,1—._A t..... .....«i.,..e of C"n "no onA
CITY OF WILMINGTON
ter ., .. Fax:[phone]
.
r
' Se 25 '01 8:25 P.12/12
: ?.
:
?? ?-... _, ...:.:'.x(GYM'?,-'li[IY.:•.?".RM3:•:11R'.' f?. ?v- A. .., v. :.t'rT

-+M
Y
-+r
R1
lJ
P rams
Earthstopping Solutions.
High Performance
Turf Reinforcement Mat
The Fourth Dimension in Soft Armor
A Streambank and Shoreline Stabilization
• Landfill Slopes and Channels
A Wrapped-Face Slopes
A Coastal Protection
? Inland Waterways
"' .1? A? Inlet/Outlet Protection

=:. .

S!° Geosolutions
In\
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
September 25, 2001
Mr. Jeff Nobles
City of Wilmington Engine
PO Box 1810
305 Chestnut Street
Wilmington, NC 28402
Re: Marsden Branch
New Hanover County
DWQ # 010442
Dear Mr. Nobles:
The Division of Water Q
2, 2001. There are seve
application. Additionally,
expedite this process.
In our correspondence c
investigated. The EA do
explored is that the prop
severe degradation or rq
(i.e. the 404 permit) and
Quality Certification can
mitigation for the impact!
Certification no. 3258 an
trigger the need for mitig
ity has reviewed your Environmental Assessment (EA) for the subject project received August
issues that must be resolved in order for this Office to proceed with processing your
is Office would like to provide recommendations that may help to resolve these issues and
ated May, 15, 2001 it was requested that alternatives to the proposed hard structures be
:s not contain any such information. The reason that this Office requested such alternatives be
osed channel hardening is considered to be impacts since these types of activities result in the
moval of aquatic life. Impacts to over 500 feet of perennial channel requiring a Federal Permit
expenditures of public funds require that a FONSI or ROD be obtained before a 401 Water
be issued. Additionally, since the bed of the stream is to be filled via channel hardening,
may be necessary. Alternatives to hard structures such as those described in General
d in the Internal Technical Guide for Stream Work in North Carolina, April 2001 do not typically
As such, this Office recommends that the use of "bank to bank" hardening and culverting be limited to less than 150 feet
to avoid any mitigation requirements. If that is not possible it is recommended that the bank to bank hardening and
culverting be limited to less than 500 feet to avoid the need for a FONSI or ROD.
In any event, this Office still requires that alternatives to the hard structures be specifically explored. Also, if the "bank to
bank" hardening and culverting combined is greater than 150 feet then compensatory mitigation for those impacts must be
provided. Finally, this Office will assume that the current plan requires a FONSI or ROD and cannot issue a 401 Water
Quality Certification until such a document is provided. This information is needed by DWQ in order for us to decide
whether this project isapprovable.
I can be reached at 919-733-1786 if you have any questions. Until this information is received, I will place this project on
hold due to incomplete information (15A NCAC 2H .0507(a)(4)).
n Program
cc: Wilmington DWQ Regional Office
USACE Wilmington Regulatory Field Office
Milt Rhodes, DWQ
Files
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1654 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919;733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands/
Action
i
U.S. ARMY CORPS OF ENGINEERS
WILMINGTON DISTRIC1,C
)100384 County: New Hanover Quad: Wilmington
i
ZRAL PERMIT (REGIONAL AND NATIONI,,vIDE) VERIFICATION
Property pwn : City of Wilmington
Engineering Department
Attn: Jeff Nobles
Address: Post Office Box 1810
Wilmington, NC 28402
Telephon No: [phone]
Zone: 18 UTM: North: 3790950 East: 232900
Size and oca lon of project (water body, road name/number, town, etc.): Approximately 510 linear feet of
Marsden Bran located between Winston Road and Devon Pond, in Wilmington, New Hanover County, North
Carolina. I
Description of ctivity: Discharge of fill material into jurisdictional water;; to stabilize the eroding banks of
Marsden Brine . This will include the use of an interlocking flexible pre-cyst concrete block reventment system
that will allgw r revegetation and the placement of 48 inch pipe in locations where existing structures prohibit the
necessary chanr el width.
Applicable La : X Section 404 (Clean Water Act, 33 U.S.C. 1344)
(check all that ply) Section 10 (River and Harbors Act of 1899)
Authcri tion: NATIONWIDE PERMIT 13
DEPARTMENT OF THE ARMY
CORPS OF ENGINEERS
F AL NOTICE OF ISSUANCE AND MODIFICATION OF NATIONWIDE PEF-HITS
FEDERAL REGISTER
MARCH 9, 2000
I 1
Bank Stabiliza ion. Bank stabilization activities =cssary for erosion prev:ntion provided the activity meets all of
the following's teria:
a. No mate lia is placed in excess of the minimum needed for erosion protection;
i
b. The ba? s abilization activity is less Eh. -n 500 feet in length; i
c. fhe activt will not exceed an average of one cubic yard per running foot placed along the bank below the
plane of the o nary high water mark or the high tide line;
d. No mater} is placed in any special aquatic site, including wetlands;
e. No material is of the type, or is placed in any location, or in azy manner, so as to impair surface water flow into
or out of any tland area;
I
f. No materi is placed in a manner that will be eroded by normal or expected high flows (properly anchored
trees and treeto s may be used in low energy areas); and,
Z00'd t306s4 :r0 Cti.fi'I,M GaV911 GeotT5ZOT6 6 :TT 100Z,9:'`r1V
S. The acii
Bank stabi
running foo
general con
the NWP and
be used for 4
£00'd 80bS
is part of a single and complete project
ion activities in excess of 500 feet in length or greater than.an average of one cubic yard per
be authorized if the permittee notifies the Distrct Engineer in accordance with the "Notification"
and the District Engineer date:mines the activity complies:with the other terms and conditions of
adverse environmental effects arc minimal both individually and cumulatively. This NWI' may not
annelization of a water of the L:nitied States. (Sections 10 and 404)
NO:CK:XMIA GZV9n SZObTSZOTc OZ:TT TOOZ,9:'C:I'd
NATIONWIDE PERMIT #13. BANX STA11LI7. ATIOly
Sections 10 and 404
PERMIT
1.
2. Proper
ensure put
3. Soil En
maintained
work belov
date.
?i?3V?\Jff No activity may cause more than a minimal adverse effectioa navigation.
rtenanee. Any structure or fill authorized shall be properly maintained, including maintenance to
defy.
1 and Sediment Controls. A?propriate soil erosion and sedunent controls must be used and
`fective operating condition during construction, and all exposed soil and other fills, as well as any ?
ordinary high water mark or high tide line, must be permanently stabilized at the earliest practicable
4. Aquatic Li Movements. No activity may substantially disrupt the movement of those species of aquatic life
indigenous io a waterbody, including these species, which normally migrate through the area, unless the activity's
primary purpos is to impound water. Culverts placed in streams must be installed to maintain low flow conditions.
5. EquipmIntHeavy equipment working in wet!ands must be placed on mats, or other measures must be taken to
minimize so disturbance.
6. Regional d Case-By-Case Conditions. the activity must comply with any regional conditions which may
have been a4de by the Division Engineer (se: 33 CFR 330.4(e)) and with any case specific conditions added by the
Corps or by the State or tribe in its Section 401 water quality certification and Coastal Zone Management Act
consistency de rmination.
7. Wild andl! S enic Rivers. No activity may occur in a component of the Islational Wild and Scenic River System;
or in a river of eially designated by Congress; as a study river" for possibl,: inclusion in the system, while the river
is in an official tudy status; unless the appropriate Federal agency, with direct management responsibility for such
river, has deih! od in writing that the proposed activity will not adversely effect the Wild and Scenic River
designation, or tudy status. Information on Wild and Scenic Rivers may bo obtained from the appropriate Federal
land managem -it agency in the area (e.g., National Park Servicc, U.S. Forest Service, Bureau of Land Management,
U.S. Fish andj ildlife Service.)
8. Tribal right . No activity or its operation may :repair reserved tribal rights, including, but not limited to,
reserved wate ights and treaty fishing and huunirg rights.
i
9. Water Qua i Certification. The perminee mus-, comply with all condit ions of General Water Quality
Certification N . 3257, issued by the North Carolina Division of Water Qu?iliry (NCDWQ) on November 22, 1999.
10. Coastal Z? to Management. The North Carolina Division of Coastal lvlanagement (NCDCM) has determined
that this NWP i conditionally consistent with :h.- North Carolina Coastal IvIanagement Program. Notification to
and written con urrence from the NCDCM is reguirud prior to wore in the wenry (20) coastal counties of North
Carolina.
11. Endangere,f Species.
a. No ctivity is authorized under any NIXP that is likely to jeopardize the continued existence of a
threatened orendangered species or a species proposed for such designation, as identified under the Federal
Endangered Sp cies Act, or which is likely to destroy or adversely modify -:he critical habitat of such species. Non.
Federal permitt es shall notify the District Engineer if any listed species or designated critical habitat mi-°,ht be
q
tc0'd BOVS# NO ?Ki;,Z:.u Qe'dSn SZOtTSZOTc OZ:TT TOOZ,9:'CaV
affected 4r is ' the vicinity of the project, or is located in the designated critical habitat and shall not begin work on
the aetivify unti notified by the District Engineer that the requirements of dte Endangered Species Act have been
satisfied end th t the activity is authorized. For activities that may affect Federally-listed endangered or threatened
species or desig ated critical habitat, the notification must include the name (s) of the endangered or threatened
species that trsa be affected by the proposed work or that utilize the designiited critical habitat that may be affected
by the propose work. As a result of formal or informal consultation with tale FWS or NMFS, the District Engineer
may add specie -specific regional endangered species conditions to the NWP's.
bi Au orization of an activity by a ` ,VP does not authorize the "take" of a
threatenedI or a dangered species as defused under the Federal Endangered Species Act-
In the abse ce f separate authorization (e.g., an ESA Section 10 Permit, a Biological
Opinion w?th "i cidental take" provisions, etc.) f om the U.S. Fish and Tai ildlife Service
or the National arine Fisheries Service, bota lethal and non-lethal "takes' of protected
species are ,in v lation of the Endangered Species Act. Information on the location of
threatened and ndangered species and their critical habitat can be obtained directly
from the office of the U.S. Fish and Wildlife Service and National Marine :r'ishcries
Service or their world wide web pages at htroJ/www.fws.gov/r9endspp/end;:pp.html and
http://nfms.?ov rot res/esahome.htn 1, respectively. ;
12. Historiq Properties. No activity that may affect historic properties listed, or eligible for listing, in the National
Register of Hist ric Places is authorized, until the District Engineer has coa.,plied with the provisions of 33 CFR part
325, Appendix . The prospective permittee aunt notify the District Engineer if the authorized activity may affect
any historic pro erties listed, determined to be eligible, or which the prospective permittee has .reason to believe
may be eligible or listing on the National Resiste: of Historic Places, and slsall not begin the activity until notified
by the Distriii t ngineer that the requirements of the National Historic Preservation Act have been satisfied and that
the activity 4 a thorized. Information on the location and existence of histcrie resources can be obtained from the
State Historic eservation Office and the National Register of Historic places (see 33 CFR 330.4(8)). For activities
that may affect istoric properties listed in, or eligible for listing in, the National Register of Historic Places, the
notification m state which historic property may be affected by the proposed work or include a vicinity map
indicating th J 1o atioa of the historic property-
13. Notificatso :
a. I i g. Where required by the terms of the 'WP, the prospecevo permittee must notify the District
Engineer with a reconstruction Notification (PCN) as early as possible. The District Engineer must determine if
the PCN is com fete within 30 days of the da*w of receipt and can request th,; additional information necessary to
make the PCN c mplete only once. However, if the prospective permittee does not provide all of the requested
information, rile the District Engineer will notify tie prospective pe mi'Vec that the PCN is still incomplete and the
PCN review p>;o ess will not commence until the District Engineer has received all of the requested information.
The prospective l ermittee shall not begin the activi y:
II !
(1) Until notified in writing by th-- District Engineer that the activity may proceed under the NWP
with any special conditions imposed by the District or Division Engineer; or
(2) If notified by the District or Division Engineer that an individual permit is required; or
(3) Unless 45 days have passed from the District Engineer's receipt of the complete notification
and the prospi et vc permittee has not received wriaen notice from the District or Division Engineer. Subsequently,
the 4JLJ ht to proceed under the NWT may be modified, suspended, or revoked only in accordance with
the procedure se forth in 33 CFR 330.5(d)(2); and
b.
of notification. The notificaticn must be in writing, and include the following information:
(1) Name, address and telephone numbers of the prospect.ve permittee;
SCO'd 80654 CZYM 5Z06T5Z0T6 TZ:TT T00Z19 *C.1V
I
(2) Location of the proposed project; and
used or ini
c.
as the no
of Generdl
d.
determine
adverse en
submit a pt
proposed c
environmei
determines
environmet
Engineer d
(3) Brief description of the proposed project; the project's purpose; direct and indirect adverse
tai ffects the project would cause; and other NWP(s), regional general permit(s) or individual permit(s)
ide to be used to authorize any part of the proposed project or!any related activity.
For of Notification: The standard individual permit application form (Form ENG 4345) may be used
:atin but must clearly indicate that it is a PCN and must include all the information required in b.(I)-(3}
;on it ion 13. A letter containing the requisite information may also bo used.
:rict Engineer's Decision: In reviewing the PCN for the pro•osed activity, the District Engineer will
ter the activity authorized by the NWP will result in more titan minimal individual or cumulative
mental effects or may be coatrary to the public interest. Tne prospective permitter may, optionally,
ed mitigation plan with the PCN to expedite the process and the District Engineer will consider any
:nsatory mitigation the applicant has included in the proposal in determining whether the net adverse
ffects to the aquatic environment of the proposed work are minimal. If the District Engineer
the activity complies with the terms and conditions of the I?WP and that the effects on the aquatic
minimal, the District Engineer will notify the permittee and include any conditions the District
necessary,
Any c mpensatory mitigation proposal must be approved by the District Engineer prior to commencing
work. If the pr spoetive permittoo is required to submit a compensatory mitigation proposal with the PCN, the
proposal may b either conceptual or detailed. If the prospective permittee elects to submit a compensatory
mitigation pan ith the PCN, the District Engineer will expeditiously review the proposed compensatory mitigation
plats. The Dis ct Engineer trust review the plan within 45 days of receiving a complote PCN and determine
whether the co ceptual or specific proposed mitigation would ensure no more than minimal adverse effects on the
aquatic enviio ent. If the net adverse effects of the project on the aquatic, environment (after consideration of the
compensatory 'tigation proposal) are determined by the District Engineer *to be minimal, the District Engineer will
provide a tittiel written response to the appi'cant stating that the project can proceed under the terms and conditions
of the nation* a permit.
If the District Engineer determines :bat the adverse effects of the proposed work arc more than minimal,
then he will of fy the applicant either:
(1) that the project does not qualify for authorization undtT the NWP and instruct the applicant on
the procedures seek authorization under an individual permit;
mitigation
adverse effect
the necessary
would reduce
included, or a
until the Distr
agencies concei
mitigation to rep
(2) that the project is authorsed under the N"" subject to the applicant's submission of a
sal that would reduce the adverse effects on the aquatic environment to the minimal level; or
(3) that the project is authorized under the NWP with specific modifications or conditions.
lie District Engineer determi :es that mitigation is required in order to ensure no more than minimal
n the aquatic environment, the activity will be authorized within the 45-day PCN period, including
nceptual or specific mitigation or a requirement that the applicant submit a mitigation proposal that
: adverse effects on the aquatic environment to the minimal level. When conceptual mitigation is
tigation plan is required under item (2) above, no work in waters of the United States will occur
Engineer has approved a specific mitigation plan.
Coordination. The District Er.rrineer will consider any ;omments from Federal and State
the proposed activity's compliance with the terms and conditions of the 14ws and the need for
the project's adverse effects on the aquatic environment to a minimal level.
9oo'd Bobs# :IO= ti-TX1:1A CZYM SZObT.ZOTE ZZttT TOOZ,9"--Td
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`C'i?s ogr arol; sfhou ssaoxa Vululmal 10(apTAad olgt0tnD2Jd IValxa wnwTStu1 aqr Ol 9ST1D¢ f7IAt 3V tLL -sMO Si
pma;idxa pug?sxpTM nsntu I2?Ia;tw Ili} ;so pa9nalp;o ail ost
P Io al Dn1;s ZIP P ( p g g
asodmd f?1Rwi d a ; ssa an sMOT un Put dams unod t o; st I13 ZIP ;o
q l ) 3 I pa;DZdxD se IRUUOU;o aSESSrd aq; apadwl 1013?sisal ? llua uwd iou;snur
&TAilDt aqI alowJatPn j •(sa;RJ Mold pun `t -?pdEO luopnol '•g.a) suoi;tpuoo tool; wralrsumo uoilongsuoDald
Ulmuirur on p;u3Tsap oq rsnw AunlrDt aui `algBxmwd raaixa wnwncsw oq; oy snnoi3 IareM;o r awa38uRy?l 'IZ
aazuOtpne sou an talu 3uTumrds iaE;lodun uE;o (,yt igim lutnutnsgns

structure.
4. Bulkheads
cloth and in v
i riprap structures must be impervious through structural tightness or the use of a suitable filter
before discharge of backfill material.
5. I2iprap shall a of such a size so as not to be able to be carried off by wave action and consist of clean rock or
masonry matcria free of debris or toxic pollutants. Stream substrate is not to be used as a source of riprap.
No exeavation'is permitted except for that required for installation of the bulkhead wall, deadmen, cables, etc.
This permit is $ t applicable to any work on Atlantic Ocean beaches.
If the proposed ctivity is greater than or equal to 500 feet in length and is within the North Carolina Coastal Area,
the applicant rti t receive written concurrence from the North Carolina Division of Coastal Management (N"CDCM)
that the activity s consistent with the North Carolina Coastal Management Program.
SPECIAL CONDITIONS
1. Soil taken fro the stream bottom during the sItcrrtion of the channel will be used for the finished stream bottom
2. Pipes shall llet buried a minimum of IS" in tae existing creek channel. No stone or concrete shall be placed in the
channel at the or outlet end of the pipe except the interlocking system c.escribed above.
3. Fill materialjdver the pipe should be properly stabilized.
Your work is au orized by this l?sgienal-Fie^°?',.' Nationwide Permit (,NW) provided it is accomplished in
strict aeeordanc with the attached conditions and your submitted plans. If yot;r activity is subject to Section 404 (if
Section 404 biq above is checked), before beginning work you must also receive a Section 401 water quality
certification fr the N.C. Division of Environmerml Management, telephone; [phone]. For any activity within
the twenty coast 1 counties, before beginning work you must contact the N.C. Division of Coastal Management,
telephone (919J 33-2293.
Please read and arefully comply with the attached conditions of the l WP. Any violation of the conditions of
dwAW&- of the r referenced above may subject the permittee to a stop work order, a restoration order, and/or
appropriate lega action. '
I ;
This Departmen of the Army RFAX-of NWP vcriacadon does not relieve the permittee of the responsibility to obtain
any other requir d Federal, State, or local approva!.,?'permits.'ihe permittee m:?y need to contact appropriate State and
local agenci:n:? fore beginning work.
If there are uestions regarding this authorization or any of the conditions of the Qs?al44ffait-of Nationwide
Permit, please ntact the Corps Regulatory Official specified below.
Date: S March 001
Corps Regulat ry Official: Angie pennockTclephone No.- (910) 251-46; 1
Expiration pa a of Verification: 11 Februan• 2002
SURVEY PLA S, FIELD SKETCH, WETLAN-D DELINEATION FORMS, PROJECT PLANS, ETC., MUST BE
ATTACHED THE FILE COPY OF THIS FORM, IF REQUIRED OR AVAILABLE.
CESAW Form 91
Revised July 1 95
OTO'd 80tS
:IO??\:n"I*,?? C3FISII SZOfiTSZ0T6 SZ?TT TOOG,9:'?1`?
usden Branch Drainage
Subject: Ma' sden Branch Drainage
Date: Fri, 14 Sep 2001 15:15:59 -0400
From: "Tofid St. John" <todd.st [e-mail]>
Organization: DWI Q Wetlands Unit
To: "joanne.steenhuis" <[e-mail]>,
"danny.smith" <[e-mail]>, "john.dorney" <[e-mail]>
CC: "Todd St. John" <[e-mail]>
I
I
DWQ#010442
Marsden Branch Drainage
I have reviewed the subject project and it appears that there are some
issues that we n ed to resolve to get this project moving:
1) The applicant_is proposing to pipe or provide a hardened V shaped
channel for 510 feet of stream.
2) Assuming thisis over 500 feet of perennial stream impact, a 404
Permit is required, and public $$$ is being spent that the SEPA triggers
have been "pulled". As such, a FONSI or ROD is required before we can
issue a 401 WQC. This can be avoided by reducing the channel hardening
by 11 feet. I.e. if a "soft" technique were employed for only 11 feet we
could get out of this mess.
3) Additionally, assuming this is a perrenial stream with aquatic life
indicators present, mitigation would be required. This could be avoided
by only hardening the channel banks, possibly replacing the bottom
hardening with grade control structures such as cross vanes. If finding
"natural rock" is a problem or they don't want to use log vanes, i don't
see why they couldn't use other materials such as concrete, for
instance, to construct cross vanes.
4) Also, note that the City did not discuss the use of any enhancement
type techniques !in their EA, only the channel hardening vs. piping. That
issue would undoubtedly come up if they decide to go through the SEPA
process. I would suggest that they explore the other options or at least
enough to avoid lthe SEPA and or mitigation.
I
This is how I p]? I an to respond to the City of Wilmington, unless my
assumptions are not correct. Please advise if you have any issues with
my approach.
i
Todd St. John, P.E.
Environmental Engineer II
DWQ
Wetlands Unit
of 1 9/14/013:16 PN/.
Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Return Receipt Requested
Jeff Nobles, staff Engineer
City of ilmington
P.O. Boc 1810
305 Chestnut Street
Wilmington, NC 28402
September 8, 2001
Subject: Marsden Branch Drainage Repair Project
Additional Information
City of Wilmington
New Hanover County
Dear Mr. Nobles:
Danny Smith of this office has reviewed your Pre-Construction Notification Application (PCN)
Environmental Assessment for the City of Wilmington's Marsden Branch Drainage Repair Project. Your
indicated a total of approximately 510 feet of stream is proposed to be hardened or culverted. Specificall}
would be hardened and approximately 136 feet would be culverted.
In addition, the respective Environmental Assessment for this project indicated that 403 feet of 1
(Marsden Branch) is to be modified to a 5 foot wide and 5 foot deep channel with 1 V2 H: 1V side slope .
Specifically, a v-shaped channel will be formed using the interlocking flexible pre-cast concrete block, ev
system. Also, it is staffs understanding that the interlocking concrete block will extend into the bottgm o
channel.! The modified stream channel floor will then be filled with native soil to create a trapezoid 1 chat
In additipn, a 50 foot and an 80 foot segment of Marsden Branch is proposed to be culverted and bkk-f 1
I
Accordingly, the following items have been identified to be problematic, given your current proposal:
i /
• TheGeneral Certification for stream bank stabilization does not correspond/apply to hard ning and filling the
footprint of the stream floor.
/ • In addition, it appears that approximately 130 feet of the stream channel is proposed to culverted. This
activity does not correspond to activities permitted under NW 13 or the respective sta issued 401 Certification
for stream bank stabilization.
This office requests that you provide alternatives to the placement of interlocking t' a and fill in the stream
floor. If this is not possible, this activity as proposed would require mitigation. Also, t present the project is
problem i tic with respect to State 401 Certification issuance for activities covered by 13. Thank you for your
?. attention to this matter. If you have any question or wish to discuss this matter furth please call me at (919) 733-
9664.
i c
Sincerely, i
1
John Dorney
cc: Wilmington DWQ Regional Office -Joanne Steenhuis
• \?
Wilmington Field Office Corps of Engineers ,
Central Files M f\
File Conv
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Cra4tree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), hftp://h2o.enr.state.nc.us/ncwetlands/
i
SEP.14.2001 3:149PM NCDENR WIRO NO.7eo P.1
TO: SMITH DORNEY EW SCI
State of North Carolina
Department of l: Vironment and Natur4 Resources
Wilmi4ston Regional Offict
Michael F. Easle , Governor William G. Ross jr., Secretary
'TAX COVER SHEET
K
Date:
Tor
CO:
VAX
REMARKS:
M
No. Qf jagm-
Fro
CO: 7
FA.X#: 010-350-2004
127 Cardinal Drive t;xtension, WHiningtoq, N,C. 28405.3845 Telephont [phone] F-IN [phone]
An Equnl Opportunity Affirmative Action Tmployer

SEP.14.2001
3:49PM
NCDENR WIRO NO.780 P.2
!
U.S. ARMY CORPS OF RNC?A HERS
WILMINGTON DISTRItjC
Action
Property
100384 County: New Hanover Quad: Wihnington
i
RAL pXp.MT (REGIONAL AND NATIONWIDE)'VEPIFIC,ATION
I
City of will ihGtou
Eng'eisering Department ;
Atttti: 7eff Nablus
Address: Post t?fllce B*% 1810
W tmtngtvn, NC 28402
Tolephona''Nae [phone]
ZonO: 16 I UTM: North: 3790950 ]Fast: 232900
Size and )Getz on of project (water body. road namolnumber, town,low-): Approximately $101,inear feet of
Marsden Braac loaattd 13Ctw0ea Winston Bead and l7cyon PaMd, is WUM14to116 New K,never Connly, North
Csrol6ia. ??
Description of ctivityr Discharge of fill material into jurisdictional waken tp stabiliZe the eroding banks of
Matsdaa >3? .'T'his will iuclude the use of an interloolans flexible pr¢-cpat concrete block reveutruoat system
Shat will allow r revegamrlon and the placement of 48 inch pipe W lacatio?s whore ealstiuS strucntres prohibs; dip
r1wossary chaw el width.
I
Appllo;tbl'L a : X_ Section 404 (Clau Water M4 33 U,S,C, 1344)
(chock all ib4t ply) _ ;;Cotton 10 (River and Iicuhois tact of 1099)
Authorizations NATIONW33)E ERKTIS
DEPARTMENT OF'= ARgy'
CORPS OF ENCtngms
AL N077CT. O7! ISSUANCE AND X40DWICA77ON OF, NATIOWMDE PERMITS
MERAL REGISTER
MAKH 9, 2000
i !
Hank Stabl!122 lon. Bank stabilim6on activities oacOOM for LvOsiOR Ptclution provided the activity meets All of
the follow] i term,
ku Ne is pl" in excess of the Titirdnu= needed tbY erosion protection;
i
b. T1to bank s bIzadon activity is less than $00 fact in length;
a. The nctivi will riot exceed= avarage of ono cubic yard per ranni4g foal placed along th& batik brlow dit
plane of th nrd nary b4h water muk or the high tide line; I
I
d. NQ I;er, iaplarod i¢ any apccial aquaria site, including wetlands; i
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e. No =tetla is of the type, or is placed in any iocarioo, or is spy manner, 50 as to impair sarfaea water flow into
or out of nny w tland Iron;
g No Matorlo is mated in a manner shat will be eroded by normal or oxp4od high flows (properly alichored
trees 4ad tridsto may be used in low energy Amu); 8nd,
I I
Z00 'a a I OW NOMMIMIX tI3'd?n 980 TSV16 6T;TT T0M9'['aav
?I
SEP.14.2001 3t49PM NCDENR WIRO
F, no A01,
BIWk stab
rming fbo
generwlconc
the N"° ,
ba udad fog t
NO. 760 P.3
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l
it; pen Of a single and domplete project. '
5
I
ion no6yitias i* oxoasa of 500 fcot to lepgth or Major r}{anl nn average of and eubie yard pe,r
be aud=ized if the pmwJtwe m fees the District Eag*ear in aeeordanca with the °Notifieatlon"
and %bo District Engineer determines the activity comptiesywith The other terms and conditions of
AdV0f60 mryjrOAmdotal aMCM are: rrtiaiM I both iD&Vidµal ly and C=Ulmtively. IIW NWP may not
nnueEudon of a water of the Untied States. (Sections 10 and 404)
eco.-I g6t4 NOMMIb4 IX Olysa SZM99015 OZ:TT 100Z,9T`,]aV
SEP.14.2001 3:49PM NCDENR WIRO
I
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NATION'9VME PERWT 013. DANX S7'.t4t ZZA-TION
Sections 10 and 404
N0.780 P.4
1. Navigation No activity May ea'ats8 Mora than a minimal advmc effeJon nav)Qorlon,
2. Proper hTa' tenaraeet:. Any atraacturc or fill arathori2ad shall b? proeerly hragintairaod, ftlohadiatg maintenance co
=M publics oty.
3. Sail Erosio and Sedimcpt Cottols. AppropFiats soil erosion qnd ar4ijuent controls must be used and
Maintained in a feetive operatiAg condition during ccnstivction, gild all oarsed soil and other MIS, As well as anY
work below the ordinary high water rragrk at high tide UA must be permaz=tly stabilized at the earliest practicable
date,
4. A4%zlit} Lif Movements. No acsvity may sobstantially disrupt the Tpovermilt of those species of aquatic As
indlgenoua tot wgtt:rbody, including these species, which ni=ally tplgrate tttreuo the Area, unless the activity's
prltnary pUrP03 is to Impound water. Culverts placed In su enas must be ?csmlled w mtalau,in tow slow cond.,Tloals.
.
5. Egtripment,l Heavy equipment working in Watlads must be placed on gnats, or other measures must be taken to
6, Re$iptt CAse.ByCa8a Cgnditieng The activity must comply with tnly regional coadidoas Which may
hav6 best Od by The Division Engineer (set: 33 CFR 330,4(x)) and with;any case specific condillons added by tree
Corps or by Stacc or tribe is its Sualoa 401 ware!' gtWIV cerdflowtion and Coastal Zona 14 =Semen Acs
consistency det ination.
9. Wild and 5 enie Rivers, No Activity may occur in a component of to Kativnal old and Scenic River system;
or in a river of eially daaigasted by CorVosa as a "study river" for posslbla int;lUGlon in The syaatem, whim rho river
is in an official tudy status; unless the appropriate Federal Ag=y. with-dBw management reaponsibiliry for such
river, has.'. ad in writing drat the proposed activity will not Adverael? effect the Wild and Scenic River
dol;- tion. or turfy status. L%torar don an Wfid and Scenic Rivers may bey obtained from Silo apptoptlato Fcdo1411
land mattagem t agengy in the area National park Service, U.S. For?.St Service, Bureau of Land Management,
U.S. Fish and Wildlife Service.) ?
8, Tribal tight. No activity or its opcrAdon may impair reserved uib4l righta, including, baT not limited to,
reserved Wier -ights and treaty fishing and humtim rights.
9. water quo H Ce tifwAdotn. The parmittee must comply Wits 4 con lions of General Water Quality
Cerlificatiop N e, 3257, Issued by the North Caroliat Division of Watcr Q Zc=nt (NCD WQ) on November 22, 1999,
10, Coastal Zo it Matia?sment, The North Carolina Division of Coastal (NCDCM) has dopjx teed
that this nV Tj cartdtt(onally consistent with the Nofth Corollas Coastal Managemem Program. Notification to
grid wrlacalco urteneo from tho NCDCM is requirLd prior to work in tho -minty (20) coastal counties ofNorth
Carolina.
i I
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11. >aidaagan: Spccios
a. No ctivity is authorized under any NWA chat is Ucly to jegpardizo the continued Watence of a
threatened or a danRorod dpeeios or a specie proposed foe such deslgnaVou, as identified under the Federal
Enddnga ed' Sp vies Act, or which is likoly to destroy or adversely modify the c;ideal habitat of suph *Ocies, Non-
F'edoral porrpltt as shall noddy The Distrlct Engineer if any listed species or designated critical hablot might be
Bogc# ?I?S9xT5?'I! tIS?lslt 520Ui5Ztlta aZtlt tOt}Z,9T'`Jtlh'
50619
SEP.14.2001 3NCDENR WIRO NO.780 P.5
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afftew er is in the vidnOy of the project, or is located in the designated orb noel habitat and shall notbe& work on
the activity, uati notified by tho District Engineer that the requirements of t?c• Endangered Species Act hove been
satisfied at}d th t the activity Is authorized. For activities that may pffcci )Fq derally-listed endangared or threatened
apseies or dcsig tcd criticol habitat. tho notiRrAtion must include rho nag(s) of the ondan3mod or tiucatened
species thaF ma be atfeoted by the proposed work or that utilize the designated critical habim chat maybe affected
by the propose work. As a result of formal or informal eonsultaRon, with the FWS or NMFS, the District Engineer
tray add specie specific regional endange;ud vpoc* conditions to the Ny1?P's.
b, I Au oriudon of aq activity by it NW8 does not authorize the aka:" of a
ftv ambn ore dangerod species u defined under the Federal "Wa.garod $peciw Act.
In the abst;nce f scp=r. anthorizatlon as ESA Section 10 Pemut; s Biological
Opinion with cidcnud tool, provisions, atcJ from the U.S. Pish aad Vvsl air* Service
or the National arine Fisherles Service, both lethal aid non.lethat I t*=" o f protected
species Are is v lotion of tho Endangered Species ,pct. Infamimtion 0)100 locution of
threatened sad adangered spccios and their cOticul habitat can be obtained directly
from the office of the U_S. Fiab and Wildlifit Service nod National Maxine isheries
Service or their world wide web pages to hap://wrvw.fws.gov/r9endspp/endi pp,html and
http:!/tifine.ov rot ras/esahoma.haYrl, rtsspectively. E
12. I3istoriq Pr patties. No activity &at may affect historic properties hate 1, or eligible far Iisting, in the National
Reglstar of Hist ric Places is autho ind, until the District Engineer has complied with the provisions of 33 CFR part
325, Appendix . The prospective pcrmittee =0 rectify the J)ktrict Fingin mr if ilea authorized activity may affect
any historic Apr ernes listed, data =d to be oligib% or which rho pfospo -,Uya permitter has reason to bolicvo
tray be eft"010 or listing on the National Register of Historic places, and shell not begin the activity until notified
by the Disttfct agineer that the requirements of the National Historid PN a,rvatlors Act have been sati4w and that
the activity is at tborized. Infortrtstii= oat ffw location and existence of historric resources can be obtained from the
Stare flister' ation Office and tho National RoEister of Mstozia places (ago 33 = 330.4(8)). Fat activltica
that tray affect istorie properties listed in„ or eligible for listing in, the National Register of Historic places, the
noofiication m state which hislaric property rasy be affoettd by the propol''sed work or include a viainity map
ln4c4ting ili i a le adott of the hisrerto property.
13. Notifica?tio
I I
i
IL T s? Wham ;squired by the imps of tho'NWP, the prosp;l tivo p=Tlittec artist notify the wwcr
Edshimr Willi i reConstmction Notification (PCN) as early as pmAihle, 'niL- District Engineer mast determine If
the PCN is co wi thin 3a days of the do of rtcbipt And can request ?th? additional information necessary to
make the PCN mploio only once, Eowever, ii; the prospective permittee oes not provide all of the requested
information. tfhc District En3inocr will notify the prespec tivc ptrrmirm that this PCN is 51111 incompleto and the
PCN review bens will not comraeaee until the bistact Hngiriesr bs8 reee'ved alt of the requested inforssratiorl.
The prosper. va ertnirrem shall not begin the activity, i
(1) Until actiiicd In wrldrig by tie Dim ct Engineer that the activity may proceed Undcr the NwP
with any spOal conditions imposed by The District or Division Pttlinear, or",
(2) If notified by the District or Division FAST eer that An individual permit is required; or
(3) 'U'nless 45 days have passed from the District Engwdes recaipt of the complete nodficatfon
and the Popee vc peaaittoc has not received writtea notice from the District or Division EnAiacpr. Subsequently,
the permittee's r' t to procecd under the NWP may be modi94 stlspen , or revoked only in accordance with
the procedufe , se forth is 33 CPSL M-5(d)(2); and
of notification. The notification must be in wrift, andl include the followia s its_fbrmation:
(1) Name, ad&mg and talcphone numbers of tha prospective pemiiltea;
Good 60,bS !Zt]Z?HIIRZIM tIBttSri S20bTSZOT6 TZtTt i002s9:'??1t
SEP.14.2001 13:50PM NCDENR WIRO
NO. 760 P. 6
(2) I.ocatior} of the proposed project; and
0) Sriof doscription of the proposed project; the projcec!'s purpose; direct and Indireor adverse
enviroflmental (feats the prejeot wooid cause; and other NWP(s), regiogpl general permit(s) or individual pfttr6t(B)
used or ink nde to be used to authorize any pan of the proposal projeor or)aMy tell" activity.
a o Of NOtiiiCtikail: '!ho standard individual parmie applicad%,M form (Form ENO 4345) may be used
ass da noti5o9ti n but must clearly indicate that it is a PCN and must inclu jo all tho infortnation roquired in b.(1).(3)
a G&nerat Ca itioa 13. A learn containing the requisite information MAY also be used,
d. Dim "ct lrngfnsee's Decision, In reviewing the PCN for the projposed activity, the District Engineer will
determine who er the activity authorized by the NWP will result iu mor0 Wma minimal individual or cumulative
adverse (MV!, eaW t6cos or maybe aantrary to the ppbiic iatarest a prnapoctive petzniitec may, opponally,
subm# a prop ed. mitigation plan with the PCN to mtpt lilt: t11e pro=s t the district EnEtA wig consider spy
proposed camlithe nsatary mitiytation the applicant has included to the propos;sl is determtnlap whether the net adverse
envirail PTA[ i'l'ects to Tice aquatic erivirotut ; of the proposed W0* axe jminirrittl. If the District Basiaeer
det=ines activity compiles with the terms and conditions of the NWP and that the effects an the auntie
environutWa ar mini ml, the District Engiaccr will notify the parmlmo anti include any conditions the ]district
Easiness da necessary?. '
Any a mponsatory mitigation proposal musk bq approved by thg Pismiet Engineer prior to commmcing
work. V'ih? I pt, porciittoo is rcquirad to farn4 a gompr?satary tnitigati4sn proposal with the PCN, she
proposal may b either conceptual or detailed, If the prospective perrnittee elects to submit a compensatory
mitigation plant +vid1 the PCN, the Midex Z'nginear will expedidoasly review the proposed compensatory mitigAtion
plM The XASti ct Engifter must review the plan within 45 days 9 =0" 4 a compiow PCN and dc-t4mino
whothsr tho oo aappal or apacifle proposed caltigation would ensure no xagre than minimal adverse effhotc on the
Aquade eau re ear, If the set adverse effects of the project on the apatid environment (after eonsldcrWoa of the
compensatory ligation proposal) are determined by the District EAgir4orjto be Minimal, the District SSngi = will
provide a time[ written response to the applicant stating Wet the project cod proceed under the rarms and conditions
of tE,a aatiotiwi a petmitw ?
i,
if ate
then he wM'no
I
the procedaTes
?I
mitigation p{ol
adverse e
1441 aeoes
would rep
included,
ubtii the l
o.
agencies cl
mitigation
900'2 BtY
istricr Engineer determines that the advarm effects of the proposed work Oro more thaw minimal,
'y the applicant eio=. I
(1) that the project does not qualify for Auihorixation "T the Ai" and imtruct the applicant on
seek authorization under tin individual pemaut;
(2) that the project is authorized under the NWP subject the tipplicant's subrnilsion of n
all that would roduce the adverse effects on the aquatic envtironment to the minimal level; or
(3) that the prajccr is owthorized under she NM wish 5pe?Iifio modifications or conditions,
a
he District Engineer determines that rniagadoa is req"Irad'in order to ensure no more [hall minimal
n the aquzrtic ertviuosunenr, the 4crlviry will be auihori=4 vritimin the 45-day PCN period, lncluding
ueptuAl of speolfie mitigation or a requiremaat that tho applicant submit a mitigation proposal that
r advcno ef`f'ects at the agtmtie environment to tha mkkpal levol. When eonecptaal mitigation is
ti ation plan is required udder item (2) above, no work in }Yates of the United States will occur
Engbtaar has approved a specific mitigation plan. '
Coordination, The District Fj&ccr will consider Any =Meats from Fcdoral and State
the proposed activity's compliance with the tetra and condirions of the NWFs and the need for
the project's adverse clYbcts on the aquatic onyiroaman: co a minimal level.
NOZ9NIMIM tI3E n 5ZOMrOT6 2ZtTT 100Z+9T'Ony
SEP.14.2001 13.51PN NCDENR WIRO
N0.780 P.7
yor ac vines raquiriag aotiScgrioa to rho 171stylct Eagincor thut jrjult in the loss Of zreatar tt= h acre of
waters of the Tr ited States, the nistrict Engineer Will. upon receipt of a notification, provide irr mediatoly (e,g,, via
facsimile ri'A= ission, ovarnightrmil, or other expeditious ma:mcr), a 4py tp the appropiiara offices of the FM
and Weil Se ice, Smto natural resource or water quality agency, EPA, k1a e N k;orie Preservation Officer
(SHPO), arid, i appropriate, the N2tiar4l Marine l~isheries Saryice. Theeo t,getlcics wlli thou hawm 30 calendar days
from tit; 4QW th Tnntcdgl is tratntttlnitted to telephone or fax the Dlsarict Fargineer notice that they intend to provide
swbstantlvo' s specific Comments, Ifso coatacted by an agetncy, the M*ct Engitoer will Wait an additional is
041en40 4aV% b fore waWng a &GIsion on the no Wctltlon, The nisariet ji?giaeer will rally consider agency
comments secti ed within the specified time frame, but Will provide no rest attso ro the resooreo agency, except: as
provided below The District Bnghwot will indicate In the ad=t Wstradve record associated with each wtifieation
that the res4 agencies' concerns were considered, As required by Seetidn 305(b)(4)($) of the Magnvson-
StQveips FiShory C user ation and MaaegczncW Act, the Dintricr Eagintte; v?-ill provIclo s response to Nstiotlal
Marino Fisl Brie Service urithin 34 bays ofreeeipt of any Essential Fish H 4tut conservation recon mendations.
APP =IV gra coutaged to provide d= Co;W multiple copies of notMcagons to expedite agency notification,
F ?'a Dtl"tieua, Wetland dolincations anist bo prepared Im accordance with the current mcuma
r4quitod by ihs erns. The pet>ssittot: may ask the Corps to dclincate the sp?=ial aqu atic site. There may ba some
delay if the 9C A does rho deliwatiast, Fut*annorc, the 45•6y period will not start until The wetland delingation
has bean r vmp tcd and submitted to the Carps, where appmprim
I
g, For vetiviti that may advarsoly affect Fedemlly-Ilead endangered or Oreareged species, the PCN must include
the name(s) of i Lose endangered at thea;L=od species that may be 4ffatod py the proposed work or utillze the
dmipated cod t habitat that may be aiYaoted by the proposed worle.
I For aetiviti that may affect historic ptoperdes listed in, or eligible for IistinS in, the Nplianal Register of
Historic Places, PCN must state which hiamia propteq may be affected by the proposed weak or include a
vicinity crag is icata g the location of tho historic propa ry, i
ld, Compliartc Cettificatim Every permittee wbo has received a Ny riopcyida permit verification from the Corps
will subltrit a st lied aertlifo4tiert ragardinll the completed work and any rp4airod mitigation. 'I'be certification will
be fitrwardad b the Corps with iho nurhorigatioa Iona. 71certification wpl ittcludet
L A 8 temont that the authorized work was done in accordance W;111 the Corps authorization, itlcludiug
tiny general or a Idc; conditions; i
b, A s temez that say required mitigation was completed in accordance with the permit conditions; and
c. 'L1te signature oTt?seperntiTtee oot'iiiytttg the completion ot'the cror[t, itt?d tnikigation,
i
15. Vso of Mul iple Nadoawide Parfaits. The ue of trtore tbaa one NW 5)r a singly and eompltte praiser is
prohibited, We twhan the acreage loss ofwattrs of the United States autrized by the Ms does aci exceed the
smears liaait of c Nm with the highest Ppacilied acreage limit, For =4 ple, if a road crossing over tidal waters
is constructed der NWP 14, with t ssoaUtad bank tsr ilizatina authorind py NWY? 13, th& Max"= aarrsago lose
of waters of die nited States for rite toMl pmjbct cannot exceed 14 acre,
I
14. WG49. c„rr y m„t.... ?T..*Hvti?•, t.?stu i:np rLrnTh rte. end ?vw.ts tw yp I' i?ty ?••wtvrY vP SSa9 VPt19 ?r PiaSCO 9i
discharges of d: dgod or fill material, may occur in the proximity of a public water supply intake except whare thrr
activity is Per re pit of rho public water ?,ppiy inrako structures or adjacent bank snsbilizatian.
17. Shellfish ds. Mo setivity, including structures and work in navigabia waters of the United States or
discharaes of dr gad or fit l Tuator1al, may occur in arras of concentrated ;;bellfish populations, unless the activity is
directly related a shelif4sh harvesting activity authorized by NW? 4.
18. Suiwbla M rlal, No activity, including structures azid work in navigable waters of the United States or
L00'd 6065# 9010NIN"11A a9yort SZOVT5ZOT6 MIT Tna?,P' '?
SEP.14.2001 I
and
367
3:51PM NCDENR WIRO NO.780 P.8
a of edged er Fiil umterial, may cowist oFun9uimbIa material {chg., trash, debris, cot bodies, asphalt, etc.)
ial d for construction or discharged must be free from toxic pollutants in tayie amounts (sae Sece;oa
C1041 Water Act).
19. Mitisx 'on The project trntsz be desionad uad constructed to avoid aaa r„?;n,czc adverac cffb.U w waters Of
the United Sts 6 to the Maxim= extent practicable at the project site &e.j on ita). Mfrigation will be required
wpett accessa to onmura that the adverse atl;'octs to the aquatic enviro=crt are minimal. The I ;strict zPaineer
will consider tb; factors discuM*4 below whca datetmiaius the accopmwliiy of appropriate alai practicable
trtid$Arion nee sary to offset adverse effects on the oquafie anvirar=ont tljst era mare than Minimal.
lt.' lii pentatory mitigation at a minirAum 1:1 ratio will be Kagpimd for all wetland impacts requiring a
Ft r, Consiste it wit National Policy, tlto District Enginow will catabtish ii preference for resteMon of wetlands
to mser um compensatory miditatton ratio, with preservation usall only is Exception&I eircunutwwoo.
7131 To c pracdcable, rho mitigolionmust be nvailnbla and capable of being clone conpideringcosts,
existing t4ohno say, and logi;tics is light ofthm overall ptojeor pstrpo¢cs, Ptxrmpies ofn-U&ation lhatrnay be
Appropriate an practicable include, but Ara trot limited to; reducing the size of the pmjaer cbmNishina and
maintaining we lpd or upland vegomted buffers to protect open wateis sac L as srroams; and replacing losses of
aquatic rescuer fuucdons and values by cmina, restoring, enfmneing, or preserving similar functions and veylum
preferably in th same wamrahed,
c. iTh District Engindar will require rastoratiort, creation, enhagcq;rizenr, or preservation of other aqu4c
rosorucea its o cir to offact the authorized impacts to the extent nopessary tin ensure that me adverse effects oa the
aquatic erw? ent are minimal. A11 hnMrtant element of any compensatopry nutigatier< pion for projaak4 in or
near sire= or other opem wrators is the cstnblisbtnent sad maintenance, to ttto taeximum extent practicable, of
vegetated Miff next to open waters on tho project site. The vegetated bul;fer should consist of nadve species. The
Disaim Rnginq r will determine the appropriate width of the vegetated bufior and in which cases iz will be required.
NottvWly, the agetated buffer Will be 25 to 50 feet wide on each side df ie trream, but rite District Engiaeax ftAy
require wider v getated buffers to address documenred water quality conacihs, If there era open waters oa the
project a"uc and to District F.nlritloer requires compensatory mitigation for +,vbtiand impacts to ensure that the net
adverse affectz q the aquatla envirvrunent my minimal, any vagatatcd bull:r will compiUa no more than IA of cho
zetaaiaing corlti ansatory mitigation acreage After the permanently filled wetands have been roptaaed ens one-to.
one acreage 4' , fa addiriorl, compensatory mitigation must address adve rao effects on watlarid functions and
values and of be used to offset rho acreage of wetland losses that weul4 occur in order to meet the arreage
limits of sorlte Me NNYPs (a.g., for NWP 39, '/- acre of wotlaeds aannot be crealed to oha n$c a A Acre loss of
wetlands to A %. acre loss; however, % acre of croaW wotlend3 can be used reduce the impacts of a 113 acre loss
cf wetlands) the prospective pettnittae is raqulred to subrAlt a compeasa,tory nslrlgatlon proposal with the )PCN,
the proposal ? be eitl ar coamptual or domilect. 1
d. To he extent appropriate, pormittoos phopld consider rnitigarioir banktag and other appropriate farms of
omnp&Mtory tiftatioa. If the District Ex gincor detuzw.inas that conVensinlory mitigation is necessary Do offset
losses of waters of the Uaitcd States and ensure that the nut adverse effects pf the authorized work on the aquaria
envirouzacata minimal, eonsolidatai mitigation appmaches, such as mill#stiorrbankc, will be the preferred
atethod of pr4v ding earapansatory rrlitIgation, ttnlless the Dfstriet Engineer g0terSri t" that acttvityspecifie
evtnpensatpry ideation is nlorp appropriate, based on which is best for the aquatic envirotiraent. These types of '
tnlslggtion psi p fared becaase they Involve larger blocks of protected Aquatic environrucat, ate more likrtly to
sheet the mitiga iou goals, and are more easily checked for compliance. If q mitigation bank or other conrolldated
Wtigton appr, achy is not available in the water shed, the District Engineer, will consider other Appropriate forms of
eompenaawry, pgation to offset the lassos of waters of the United States tp camro tbat the net advcrst effects of
rho authorixed ertc as th@ tuluncio GnvirontnCnt are rainiarnl.
20, Spowning tans. Activities, including =auras and wofk its navisablt; waters ofibe United States or
discharges of dged or fill matcrtsl, in spawning areas dtirirlg spawniao seasons must be avoided to the tr+aximutn
extent practical e. Activities that result in the physical desauctlorr (eo, txcavate, fill, or smother downetre&m by
800.3 806;5# Hosertixzrrt CRYM 8'cc?TIFOT6 ea:TT TOO?,9T-,nrV
SEP.14.2001 3:51PN NCDENR WIRO NO.780 P,9
Substantial f llrbif lity) of an Qnportaer spawnlas urea ore not suthvrized.
21. Matagem Z of WaTer Flows. To the maximum extent pzr,eticable, she 46vity multi be desiped to mainmia
pr!leanstamueltina ownstraam flow sandiness (e.g., iochdon, copwcity, and flew rates). Furthermore, the aettvily
must not p0, ently restrict or impede the passage of normal or expeetod ?lah Rows (unless the prImgry p?rpoaa
ofthe fill isto i aund waters) and the 6tmcprre or discharge of dredged 0 fill material must withstand expected
high flews. I acdvity tnusy to the tttaxtmum e%:cac practicable, provide f'or relgining excess flowa from tho site,
provlde for fns' twining surf$ea flow rases from the site similar ro precoaaaitcrian sonditious, and must not Increase,
Witter flows; fro the ppjcct site; rrioeate water, or redirect water flow beyc o,3 preconstruedon coTvihiane, Its
addition, t11Q qc vity must, to tam maximum extent ptucricable, reduce edvexse effects ouch as flooding or erosion
downetroarn am upauoam of the project site, unless the activity is part of a huger system designed to rn4nnge water
flows,
22, Adversq E 03 FrMn Impoundr7agats, If the activity, including strvptures And work in navignbio waters of the
t:Tsurcd Staeeo o discharge of dredged ar i'rt1 material, creates rtia lrnpou?,nt of Water, 4dveTae offsets on the
aquatic sy8tam aused by the aceeleratod passage of water andlor the resrricVoa of its flow shall be rrtiinimizcd to tl,u
mdximmnexten practicable
23. Waterfowl reeding Areas. activities, ineludirs& structu vs and wor%iii navigable waters of the United states
or disehar$e1of edged or fill tl wrial, into bree&;; areas for migratory u?trrfowl nw! be avoided m the
tntrximmut eaten praodmble. ;
let, kemaval o empormy Fills. ABLY temporary fills mast be removed in j;ocir a4acly and the aft mo areas
returned to the' pToexistiag elevation,
2S, Dc6laaaied titical Resource Waters. Ctitical resource Waers inoiudp, NOAA-designated marine sglctrwios,
Nadensl Estp Research Reserves, National wild and Saeaia Riyefs, OdHoal habitat for Federally 11sred
threatened aid agered species, coral reef's, State astuml h4ritege sites, and outstanding national rmurce waters
or other wrnte' freially designated by a State as having pard=lar cmvi wt pental or ecological sigailltnnee and
idontifkd by %lu District nnglucor after notice an4 opportunity for public cgraraent
' I
215. FAIs Wi 100-Year Floodplains. For purposes of this general wadidon 100-year floodplains will be
pidealed tru h the Federal A=gency ManaacmautAgency" (PPMA) Flood Insurance Ruts Maps orF9MA-
approvcd loci1 edplain maps.
27. The pertnil t mdcrstands and ag=es that; if future opetaO=s by the Unied States require the removal,
relocodou, of o alteration, of tiro s=ctwo or Work lleteua awthudzzd, qr ?f, In the opinion of the SoMlary of the
Army or his aqt orized reprawntaave, said structure or work shall cause tin -aasonable obstr=tioa to the Arm
n4vigativn of navigable waters, tits pennittee will be requited, upon dueorice from the Corps of Fttgiaeers, to
remove, reloc t , ar alter the stmcnial work or obstnictions causod therebyy without expense to rho United Stares.
Na claim shop made against the tlnitod States an account of any such roraoval or alteration,
STATE CONSISTENCY CONDITIONS
1. Use of treca ? d troetopA as stabilization m4terW is not allovved,
Z, Bulkhead 4 riprap srruomm alignmenra will not extent! farther than alt •avamge distance of r&v (2) lbat
waterward or i xitttuat of five (S) feet from the =UL high water elevatiou contour in tidal areas or from the
nouml water a clav$kion contour in non-Fidel waretz.
3. All backfill +atrrial will be obtained from an upland source and cenFned landward of the bulkhead of riprap
600-d 90D5# 9OXONIN71M a9yu SZobT9ZOT6 fi?;TT IOOZOT'On`d
SEP.14.2001 3:52PM NCDENR WIRO NO.780 P.10
' i
stnrctum. ? i
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4. Bulkheads in I ripmp structures most be impervious through structural Tf?ly xtss or the use of a suitable filter
olorh and is plod bofvrc disohasga of bedWill mutraial.
I
5. (trap shall 4 of such a size so as not to bo able to be cat'ried Off by Wave action and consist of clean rook or
roomy Irate ' free of debris of tonic p9llumnts. Stream substttiu: is not to bo used as a source of riprap.
No excavation . permitted except for that required for installation of f3ra bulkhead wall, deadmoti, cables, ac.
i
371W porrtut Is tt t applicable m aqy Work on Atlantic 0ceaa bcachco
if the proposed tivity is greater 0= or equal to 500 Pear is l=th and iS v?itl is the North Camliua Coastal urea,
the applicant m t receive written concurrence from the North Qrolina Division of Coastal Management (NCDCM)
that Ilia activity eortsi Unt with the North Carolina Coastal Man 991ric tt >?ra81fi .
SPECIAL CONDI"CYONS
1. Soil rakan,£r4 the sttc=bottom during thn altnredoa of *a ebaanel w1)il be tuod rot the wished stream bona"
2. Pipes dial[ b0 buxi(;d a nsinimum of 18" in the existing creek channel, XI stone or CO"Ottte shall be placed in too
chaaael at the ' et or outlet end of the pipe except the interlocking system 40scri'bed above,
3. Fill material ver the pipe should be pv*ady stabilized.
Your wort is, air iod2ed by This l Nationwide permit (NWP) provided it is accomplished in
strict tsoaerd4 with the attached cantUdons and your %brnitted Plana, If yo r activity is gubyect to Sacft 404 of
Section 404 bloc Abova is cbtaW4 buf'oro beginning work you moat also rei;give a Sectica 401 water quality
eei tt$catiotr J?0 the N.C. Divislon ot'>rrtviraamanial lviansgement, tdlephonq; [phone]. For any activity wtthln
die twenty ooa ootn ti4a. before beginning work you must contact the N.C.IDlvision of coastal Management,
telephone [phone]. ...,
Please tied turd ttreRtUy t:otngly,witb the t< d cortdition3 oEtho I`CM. Any violaana of the aandidons of
the UT-w the tefbremed above may subject the permittee to a stop wgr>c order, a restoration order, and/or
appropr m leli Action, II
Thin Dap ctt of the Amy RQP-ae NWP verification does not 7611eYe the R==ttee of tho responsibility to 4btaia
any other tequ' d redetal, State, or local a pprova10pamits,11W permittee any need to coamcr Appropriate State and
local tagendes b fore beginning work.
I ''
If th= an any ucstions-ragta'diRB thin aWthorizsaaa or troy of the Condlido5 of the Gn?slalar?-cwNudonwide
Permit, please nwra the Corps Regulatory Official sp&444 below. ;
Trite: S 001
CorpsRogulmt ry Dffieialz Anzio .PannockTolephoae No.: 910j 1251.4611
Expiration Da of V'er1flcatlon::1_Febmaty2002
SLTRVEY FLA &, Flkl.'O SKETCI; WETLAND DELINEATION Fo1:?, PROJB= PLANS, h" W., MUST HE
AT "11"D =3 FILE COPY OF THM FORM. V ARQUIRFsD OR AVAILABLE.
CESAV? Form 91
Revised July 19S
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ENVIRONMENTAL ASSESSMENT
FOR
THE CITY OF WILMINGTON'S
EN BRANCH DRAINAGE REPAIR PROJECT
PREPARED BY
JEFF NOBLES, STAFF ENGINEER
CITY OF WILMINGTON
P.O. BOX 1810
305 CHESTNUT STREET
WILMINGTON, NC 28402
[phone]
Extreme flow velocities caused by an undersized pipe culvert at Winston Blvd. is
believed to have started the scour of the stream banks of Marsden Branch. Several
decades of high velocity flow during large storm events has continued to severely erode
the banks to dangerous conditions. Roots of many trees have been exposed or undercut
due t' this problem. Several buildings are also in danger of being undercut. One
building, near the end of the project, has already had its foundation undercut.
Environmental And Geographic Makeup
The stream drains a 42 acre watershed is comprised of single family residential, multi-
family {residential, and commercial land uses. In addition, the new Independence Blvd.
extension is expected to substantially increase storm runoff when it is completed. The
entire run of the existing stream is adjacent to single or multi-family residential lots on
both sides. The existing stream banks are overgrown with trees of all sizes. Trees and
the steepness of the banks prevent the ability to maintain the stream in its current state.
The stream empties into an existing, permanent detention pond that overflows into Devon
Pond. Devon Pond then empties into the Burnt Mill Creek, which is not classified as
Trout, Tidal Saltwater, High Quality Waters, Outstanding Resource Waters or Water
Supply.
Project Need and Purpose
The existing stream cross section is not large enough to allow uniform flow during large
storm events. The irregular cross section leads to higher than normal velocities, which
leads to more erosion of the stream banks. As a result, the stream banks along a large
portion of the run are extremely steep and unstable. Because of the steep banks and
undercutting caused by scouring during normal flows, the stream is extremely dangerous
for the property owners adjacent to it.
i
The North Carolina Department of Transportation Independence Boulevard Extension
Project also presents a significant increase in runoff within this watershed. NCDOT has
installed an outlet at the far upstream end of Marsden Branch near Wilshire Blvd, as a
direct drainage outfall for this project. The section of stream between Wilshire and
Winston is' also in dire need of similar repair, but due to budget constraints it was
determined that the lower section had a more severe and immediate need.
The intent 60 the proposed repair is to stabilize the stream banks to eliminate erosion, as
well as to provide a uniform and properly sized cross section to allow uninterrupted flow
during large storm events.
Design Alternatives
In an effort to prevent future problems and repair existing problems, the City of
Wilmington,proposes the following improvements. The tight working conditions and an
i
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unev In terrain have limited the options for repair of the existing channel. The existing
36-inch storm drain pipe under Winston Blvd. will be replaced with a 48 C pipe to
allow lfor larger flow volumes. This pipe will be extended approximately 50' t the
existing outfall to accommodate terrain restrictions. The invert of the ou is too deep
to achieve the side slope necessary to carry the expected flow and also stay within the
easement constriction. The 48-inch RCP will outfall into a trapezoidal channel: 5' wide,
5' deep, with 1 '/s H:1 V side slopes. The channel will be lined using an interlocking
flexible pre-cast concrete block revetment system that will allow regrowth of riparian
vegetation while also preventing future erosion. The space between each block is to be
backfilled with soil and seeded to allow grass growth. A V-shaped channel will be
formed using the interlocking flexible pre-cast concrete block revetment system. The
bottom i of the channel will be filled with native soil excavated on site to create-the
trapezoidal shape. The channel run is 403 feet long, draining into a aigh foot ection of
60-incl? RC pipe. This pipe also is necessary because of terrain rest the
location of an existing building that is being undercut by the existing stream. The pipe
then empties into the existing fiber form lined channel, leading to the existing sediment
basin. Approximately thirty feet of existing fiber formed channel will be removed near
the outlet of the pipe.
In order to construct the channel and leave room for future maintenance, many trees will
need to be removed. The City has proposed to provide two 3"-4" caliper trees per
property owner to be set on or near the easement line in an effort to provide shade for the
proposed channel. The following is a list of trees that the residents may choose from:
COMMON NAME BOTANICAL NAME NOTES
River Birch Betula Nigra One per owner
Flowering Dogwood Corpus Florida One per owner
Crape-Myrtle Lagersroemia Indica One per owner
i Japanese Cherry Prunus Serrulata One per owner
Red Maple Acer Rubrum
Sweetgum Liquidambar Styraciflua
Longleaf Pine Pinus Palustris
Loblolly Pine Pinus Taeda
Live Oak Quercus Virginiana
Weeping Willow Salix Babylonica
Pi in thel Existing Channel.
One alternative design would be to pipe the entire run of the existing stream. Concrete
pipe from 48" to 60" diameter would be needed. Tree removal would also be necessary
for this proposed design. Two primary downfalls are associated with this design
alternative. First, the obvious downfall is the loss of the stream and home place for many
animals. Second, the necessity of having to pay a $125.00 per lineal foot mitigation fee
for removing the stream would make this design alternative grossly over budget.
Another alternative is to leave the stream in its current condition. This alternative would
obviously make no improvements to the deteriorating stream banks. Eroison and
flooding would continue during large storm events. Damage to private property would
also continue due to possible stream bank sloughing and flooding due to the undersized
pipe culvert at Winston Blvd.
Wetlands:
This project will have minimal wetlands impact. Wetlands are located only at the bottom
of the existing stream. Less than one tenth of an acre will be affected.
Topography:
The overall topography of the watershed will remain unchanged. There significant
changes are minimal with the proposed work included in this project.
Soil Tybes:
No new soil types should be introduced to the project area. All fill material should be
soil that has been excavated on site.
Forest Resources and Vegetation:
Approximately forty large trees and large quantities of undergrowth are going to be
removed during the course of this project. In an effort to offset the removal of these
trees, each property owner adjacent to the channel will receive two P-4" caliper trees to
be planted as near to the channel as possible and still allow maintenance access. A list of
the tree selection can be seen in the Lined Channel Design Alternative section. The lined
channel be revegetated with grass once the project is finished.
Shellfishlor Scaled Fish:
There are no shellfish or scaled fish habitats in this stream, nor will any be effected by
this project.
Current Noise:
The only effects on current noise levels will be temporary during construction of the
channel.
As stated 'previously, Marsden Branch empties into an existing sediment basin.
Therefore, sediment and debris are removed from the storm water prior to entering Burnt
Mill Creek'. During construction water will be by-pass pumped from the Winston Blvd.
end to the sediment pond. A pump will also be in use in the active construction area to
divert flow, around the open soil directly to the pond.
The contractor will be limited to 200 linear feet of the channel corridor fully excavated
and exposed at a time. Once the channel has been lined with the pre-cast block revetment
system and'the exposed areas have been seeded and either mulched or covered with
biodegradable erosion control blankets, the contractor can expose and excavate further
down the channel. All areas disturbed outside of the proposed channel will be seeded and
i
mulched for stabilization. The pre-cast block area will be seeded as soon as the voided
area b?l tween blocks (approximately 20% of the surface area is voids) is backfilled.
Vegetation will be replaced to the extent possible. Two trees will be planted at or near
the easement line of each individual property to allow access to the channel for
maintenance. Plantings will follow the stabilization activities listed above.
North Carolina Department of Environmental and Natural Resources, Division of Water
Oualitv, - 401 Certification PENDING
United States Army Corps of Engineers - Nationwide Permit 13 AUTHORIZED
ATTACHMENT "A"
Sheet 1- Plan View of Project
Sheet 2 ?; Plan View of Project
Sheet 3 ,, Proposed Cross Section of Channel
Sheet 4 7 Aerial Photo/Topography Map
Sheet 5i Existing Conditions Photographs
Sheet 6, Existing Conditions Photographs
Sheet 7 -', Sample Photographs of Interlocking
Precast Block Revetment System
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DATE: 7/19/01
PROJECT NO. XXX-XX , XXXX
DRAWN BY J. RHYNE
CHECKED BY J. NOB L? ES
SCALE 1°=50'
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DRAINAGE IMPROVEMENTS
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PROJECT NO. xxx-xx ;-xxxx MAR S D E N' S BRANCH DRAWN BY J. RHYNE DRAINAGE IMPROVEMENTS r
CHECKED BY J. NOBLES 1 • _,37s'' o
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PROJECT NO. XXX-XX-XXXX MAR S D E N S BRANCH ?j of W Lµ r
DRAWN BY J. NOBLES DRAINAGE IMPROVEMENTS • .
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PHOTOS TAKEN FROM THE
WINSTON BLVD. BRIDGE LOOKING
DOWNSTREAM.
V
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INTERLOCKING FLEXIBLE PRE-CAST BLO(
(PROJECT LOCATED IN MT. AIRY, NC)
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I

PHOTOS TAKEN NEAR DOWNS'.
THE PICTURE IS THE STORAGE
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HE BUILDING IN
WING SHEET 2
SHEET 5
i
City of Wilm Proj # 01
Subject: City of Wilm Proj # 010442
Date: Wed, 13 Jun 2001 16:49:52 -0400
From: Joanne Steenhuis <Joanne. Steenhuis @ ncmail.net>
To: Cyndi Karoly <[e-mail]>
CC: Todd St John <[e-mail]>
Cyndi & Todd,
My newest comments have been entered into FMP. This was the project I
discussed with the both of you (separately) that would be an improvement
to the stream that now exists. There is NO room for restoration and I
agree with the city that it is the best thing for that stream. Call me
if you have questions OR if my second set of comments didn't make it on
FMP.
Joanne
Joanne Steenhuis <Joanne. Steenhuis @ ncmail.net>

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,
MEMORANDUMi,
i
T(r: - - John Dorney Regional Contact:
N 7n-Discharge Branch WQ Supervisor:
Date:
SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS
Facility Name Mar, den Branch Drainage c/o City of Wilmington County New Hanover
Project Number 01 ! 0442 County2
Recvd From APP Region Wilmington
Received Date 3/26/01 Recvd By Region
Project Type drainage improvement
Certificates I Stream'
Permit Wetland Wetland Wetland Stream Class Acres Feet
Type Type Impact Score Index Prim. Supp. Basin Req. Req.
I 13 I Stream IO Y jO N I 118-7463-2 I C
Mitigation j Wetland
MitigationType Type Acres Feet
SW 130,617.1 1 510.00
Is Wetland Rating Sheet,Attached? O Y 0 N
Did you request more info? 0 Y 0 N
Have Project Changes/Conditions Been Discussed With ica V O Y ON
Is Mitigation required? I, O Y ON Recommendati n: OQ ISS e O Issue/Cond ?eny
Provided by Region: Latitude (ddmmss) Longitude (ddmmss)
Comments:

see below
cc: Regional Office
Page Number 1
Central Office
'011/
Facility f me Marden Branch Drainage do City of Wilmington
Project.Number 01 0442 Regional
i
/Comments (continued from page 1):
cc: Regional Office
Central Office
County New Hanover
Contact: Joanne Steenhuis
Date: 6/11/2001
Page Number 2
{?u
.?
4-4
'3`
ay 15, 2001
DWQ Project # 010442
New Hanover County
CERTIFIED MAIL-RETURN RECEIPT REQUESTED
Mr. Jeffrey Nobles
City of Imington
Development Services
Post Office Box 1810
Wilmington. NC 2840-1810
Dear Mr. Nobles:
The Division of Water Quality has reviewed your plans for the discharge of fill material
into 519 linear feet of streams located at Marsden Branch Draining repair project in New Hanover
County for stream work. Insufficient evidence is present in our files to conclude that your project
must be built as planned in waters and/or wetlands in accordance with 15A NCAC 2H .0506.
Therefore, unless modifications of the proposal are made as described below, we will have to
move toward denial of your 401 Certification as required by 15A NCAC 2H .0507(e) and will place
this project on hold as incomplete until we receive this additional information, we are requesting
(by copy of this letter) that the U.S. Army Corps of Engineers place your project on administrative
hold.
Please provide us with information supporting your position that states your project must
be constructed as planned and that you have no practicable alternative to placing fill in these
waters and/or wetlands. Specifically can you provide 1) a map depicting precise locations for the
culvertirg, 2) the length of riprap to be used at culverts, 3) a riparian planting/revegetation plan
and 4) .9Iternatives to the use of hard structures? Also since more than 500 linear feet of stream
channel are to be impacted, we believe that this project will require an Environmental Assessment
under the state Environmental Policy Act. Please contact Mr. Milt Rhodes at [phone] in the
Division's Planning Branch to start this process. Any documentation such as maps and narrative
that you scan supply to address alternative designs for your project may be helpful in our review of
your 4011 Certification.
Please respond within three weeks of the date of this letter by sending a copy of this
informatiopn to me and one copy to Noelle Lutheran, Wilmington Regional Office. If we do not hear
from youiin three weeks, we will assume that you no longer want to pursue this project and we will
consider the project as withdrawn. I can be reached at 919-733-9646 if you have any questions.
cc:
I J o a n ra-
10.
5 Aeen hui 5
Michael F. Easley
Governor -
William G. Roass, Secretary
Department of Environment and Natural Resources
Kerr T. Stevens
Division of Water Quality
n DWQ Regional Office \,_/
1 Field Office Corps of Engineers
Central Files
File Copy
Milt Rhodes
`? 60iR
Division of Water Quality 1650 Mail Service Center Raleigh, NC 27699-1650
Wetlands/401 Unit: [phone]
Fax: [phone]
MEMORANDUM
TO:
SUBJECT: W
Facility Name
n Dorney
i-Discharge Branch
Regional Contact:
WQ Supervisor:
Date:
N. Lutheran/D.Smith
ND STAFF REPORT AND RECOMMENDATIONS
rden Branch Drainage c% City of
Project Number 01
Recvd From AM
Received Date 3/26
Project Type drai
0442
1
Recvd By Region
rent
Certificates i Stream Stream Impacts (ft.)
' Class ..
Permit Wetland Wetland Wetland Stream' Acres Feet
Type Type Impact Score Index Prim. Supp. Basin Req. ; Req.
F 13 Stream O Y p N F- 18-74-63-2 ? r SW 30,617. ?- r 510.00 ?-
Mitigation Wetland
MitigationType t Type Acres Feet
Is Wetland Rating Sheet Attached? 0 Y 0 N Did you request more info? 0 Y 0 N
Have Project Changes/Conditions Been Discussed With Applicant? 0 Y 0 N
Is Mitigation required? Q Y O N Recommendation: 0 Issue 0 Issue/Cond 0 Deny
Provided by Region: La#itude (ddmmss) Longitude (ddmmss)
Comments:
Recommendation: Deny
Through the use of a NW 13, this project imposed to stabilize the stream banks for 374 feet of
modified natural stream and culvert 136 linear feet of a modified natural stream. Further, the
will he increased to a 511 slope and hardened with pre-cast concrete blocks, and the "stream floor"
will be refilled w*th "native soil' as depicted in plan. Neither the NW 13, nor our CG (3258) fits this
proposal
see below
i
cc: Regional Office
Central Office Page Number 1
?I
County New Hanover
County2
Region Wiilmington
Facility Name Marten Branch Drainage c% City of
County New Hanover
Project Number 01 C 0442 Regional Contact: N.Lutheran/D.Smith
Date: 4/26/2001
cc: Regional Office
Page
Central Office Number 2
Development
Services
City of
Wilmington
North Carolina
March 20,',2001
Nit Rob Rdings
Wetlands IJrut
4401 Reedy Creek Road
Raleigh, NI 27601
Dear bin Aidinzs,
Please
by the City
305 Chestnut Street
PO Box 1810
Wilmington, NC 28402-1810
[phone] tdd
010442
MARSDEN BRANCH DRAINAGE REPAIR
the enclose plans, narrative, addendum, a check for $475.00 (application fee), and permit
for the Marsden Branch Drainage Repair Project. This project is being implemented and funded
of Wilmington.
As described in the narrative, disturbance of wetlands is less than 1 /10 of an acre, while impacting more than
150 linear feet of streams. We have received a Nationwide Permit 13, Section 404, from the Army Corps of
Engineers f'or this project. The A.C.O.E. Action Id. is 200100384. The intent of this project is to repair and
improve the drainage way to a stable stream with consistent pattern and profile. If you have any questions, do
not hesitatelto contact me at [phone].
Sincerely,
Jeffiey No
Staff Enai
Enclosures
0
Community Development Planning Engineering Development Management
[phone] telephone [phone] telephone [phone] telephone [phone] telephone
[phone] facsimile [phone] facsimile [phone] facsimile [phone] facsimile
010442
{ K 6}. ,FEB 2 7 2001
ODWQ ID. CORPS ACTION ID: _ .:Js G' C? EPA
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #) 13
PARE-CONSTRUCTION NOTIFICATION APPLICATION
FOR NATION)VIDE PERMITS THAT REQUIRE:
1.1 NOTIFICATION TO THE CORPS OF ENGINEERS
2.! APPLICATION FOR SECTION 401 CERTIFICATION
3. j COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD
OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (7) COPIES MUST
BE SENT TO THE NC DIVISION OF WATER QUALITY ATTN• JOHN DORNEY 4401 REEDY CREEK
ROAD RALEIGH NC 27607. PLEASE PRINT OR TYPE.
1. OWNNR'S NAME: City of Wilmington (Mary Gornto -City , Manager)
2. MAILING ADDRESS: 305 Chestnut St.
SUBDI VISION NAME: N/A
i
i
CITY: WHmin on STATE: NC ZIP CODE: 28402-1810
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
Rosemont Ave./Devon Park
3. TELEPHONE NUMBER: (HOME) _ (WORK) [phone]
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP
OR AERIAL PHOTOGRAPHY WITH SCALE):
COUNTY: New Hanover - NEAREST TOWN: Wilmington
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) Stream is between
Rosemont Ave. and Ashley Cir. (east of Rosemont) Proiect starts at Winston Blvd flows north and ends
downstream at Devon Pond.
6. IMPACTED OR NEAREST STREAM/RIVER: Burnt Mill Creek RIVER BASIN: Cape Fear
7. (a) IS V?WJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER
(SA)
,
,
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-II)? YES 0 NO 0 IF YES, EXPLAIN:
I
(b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANA
EMENT AREA OF ENVIRONMENTAL CONCERN
AEC
? YES 0 NO 0
G
(
)
(c) IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
---
m
COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION? Developed
I y
( . HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PRO, CT? YES ? NO ® IF YES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS PERMIT AND
ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401 CERTIFICATION): -
9.
10.
11
12

13.
14.
(b) ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE?
YES [] NO ® IF YES, DESCRIBE ANTICIPATED WORK:
(a? ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: 0.50
(b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
0.04
(a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: - EXCAVATION:
FLOODING: - OTHER : Restoration
DRAINAGE : _ TOTAL ACRES TO BE IMPACTED: 0.04 (assumed 3' wide bottom continuously
submered for length of stream)
(b) (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF RELOCATED,
PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION:
i
LENGTH BEFORE: 510 FT AFTER: 374 FT
WIDTH BEFORE (based on normal high water contours): 9 FT
AVERAGE DEPTH BEFORE: 3 FT AFTER: 5 FT
(b) (2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: - PLACEMENT OF PIPE IN CHANNEL: X
CHANNEL EXCAVATION: X CONSTRUCTION OF A DAMIFLOODING: -
OTHER: X Restoration
i
IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TO THE POND? - WHAT IS THE EXPECTED POND SURFACE AREA? _
DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF MECHANICAL
EQUIPMENT TO BE USED? (ATTACH PLANS; 81/2 BY 11 DRAWINGS ONLY)
The stream will be restored to provide a uniform cross section and profile to reduce erosion in an already
flexible pre-cast concrete block revetment system to allow re-vegetation while also protecting against
ern.qinn_ 1 A nnrtinn nfthe Pv;ct;na CtPAm ,frill ha rP..1-A 1.0 o A410 ..,..a ,,, -- .,d o.e e. ; ?:« . a «
PURPOSE OF PROPOSED WORK: Repair and restoration of deteriorating stream caused b scour
and erosion of stream banks.
STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT IN
WETLANDS (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND IMPACTS)
1
15. OU ARE REQUIRED TO CONTACT THE US FISH AND WILDLIFE SERVICE AND/OR
NATIONAL MARINE FISHERIES SERVICE REGARDING THE PRESENCE OF ANY FEDERALLY
LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL
HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT.
DATE CONTACTED: _
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHP(?) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREA
WHICH MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED 1/23/01.
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OT THE USE OF
PUBLIC (STATE) LAND? YES ® NO ? (IF NO, GO TO 16)
(a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOC NT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENV?ONMENTAL POLICY ACT? YES ? NO
(b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES ? NO ?
IF ANSWER 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE STATE
CLEARINGHOUSE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
I
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED
ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OR FILL MATERIAL INTO
WETLANDS:
(a) WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES, AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38).
ALL STREAM (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN ON
THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET OR 1 INCH EQUALS 100 FEET
OR THEIR EQUIVALENT.
(b) IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY
PRODUCT.
(c) IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
(d) ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
(e) WHAT IS LAND USE OF SURROUNDING PROPERTY? Residential (0.5acre lots)
(fl IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A
,I
,I
I
f
SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE US MAY NOT BE IMPACTED PRIOR TO:
1. ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2. EITHER THE ISSUANCE OR WAIVER OFA 401 DIVISION OF WATER QUALITY
CERTIFICATION, AND
(IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH
CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM,
l&/o/
OWNER'S/AQ.ENT'S SIGNATURE DA
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED).

MARSDEN BRANCH DRAINAGE IMPROVEMENT PROJECT
NARRATIVE
The project is located between Rosemont Avenue and Ashley Circle. The project starts
at Winston Blvd. and continues to near the outfall at Devon Pond.
Extreme flow velocities caused by an undersized pipe culvert at Winston Blvd. is
believed to have started the scour of the stream banks of Marsden Branch. Several
decades of high velocity flow during large storm events has continued to severely erode
the banks to dangerous conditions. Roots of many trees have been exposed or undercut
due to this problem. Several buildings are also in danger of being undercut. One
building ,l near the end of the project, has already had its foundation undercut.
The strum drains a 42 acre watershed comprised of single family residential, multi-
family residential, and commercial land uses. In addition, the new Independence Blvd.
extension is expected to substantially increase storm runoff when it is complete. The
existing stream cross section is not large enough to allow uniform flow during large
storm events. The smaller wetted perimeter tends to lead to higher than normal
velocities, which leads to more erosion of the stream banks. As a result, the stream banks
along a large portion of the run are extremely steep and unstable. Because of the steep
banks an? undercutting caused by scouring, the stream is dangerous for the property
owners ai jacent to it.
In an effort to prevent future problems and repair existing problems, the City of
Wilmingtpn proposes the following improvements. Single family residences are located
on both sides of the stream for the entire length. These tight working conditions and an
uneven terrain have limited the options for repair of the existing channel. The existing
36-inch storm drain pipe under Winston Blvd. will be replaced with a 48-inch RC pipe to
allow for urger flow volumes. This pipe will be extended approximately 75' past the
existing outfall to accommodate terrain restrictions. The invert of the pipe is too deep to
achieve the side slope needed to carry the expected flow. The 48-inch RCP will outfall
into a trapezoidal channel: 5' wide, 5' deep, with 1.5H:1 V side slopes. The channel will
be lined using an interlocking flexible pre-cast concrete block revetment system which
will allow regrowth of riparian vegetation while also preventing future erosion. Please
see sheet 7 of Addendum "A" for an example of this system. The bottom of the channel
will be fill?d with native soil excavated on site. The channel run is 374 feet long,
draining into a sixty foot section of 48-inch RC pipe. This pipe also is necessary because
of terrain restrictions. The pipe then empties into the existing fiber form lined channel,
leading the; existing sediment basin.
As stated previously, Marsden Branch empties into an existing sediment basin.
Therefore, sediment and debris are removed from the storm water prior to entering Burnt
Mill Creek. During construction water will be by-pass pumped from the Winston Blvd.
end to the sediment pond. A pump will also be in use in the active construction area to
divert flow around the open soil directly to the pond.
The contractor will be limited to 200 linear feet of the channel corridor fully excavated
and exposed at a time. Once the channel has been lined with the pre-cast block revetment
system and the exposed areas have been seeded and either mulched or covered with
biodegradable erosion control blankets, the contractor can expose and excavate further
down tlxe channel. All areas disturbed outside of the proposed channel will be seeded and
mulched for stabilization. The pre-cast block area will be seeded as soon as the voided
area betyveen blocks (approximately 20% of the surface area is voids) is backfilled.
Vegetat Icon will be replaced to the extent possible. Trees and shrubs will be planted at or
near the eight of way line to allow access to the channel for maintenance. Plantings will
follow the stabilization activities listed above.
Wetlands:
This project will have minimal wetlands impact. Wetlands are located only at the bottom
of the existing stream. Less than one tenth of an acre will be effected.
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DATE: 1/24/01 1
PROJECT NO. XXX-XX-XXXX MARS D EN' S BRANCH WILMr
DRAWN BY J. RHYME " ?" • ?
DRAINAGE IMPROVEMENTS
CHECKED BY J. NOBLES y ' s
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DATE: 1/30/01
PROJECT NO. XXX-XX-XXXX
DRAWN BY J. NOBLES
I CHECKED BY J. NOBLES I
MARSDEN'S BRANCH by OF W1 C/p
DRAINAGE IMPROVEMENTS
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PHOTOS TAKEN NEAR DOWNS',
THE PICTURE IS THE STORAGE
NEAR STATION 5+50.
'AM END OF PRC
JILDING SHOWN
SHEET 4
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ILDING IN
SHEET 2
PHOTOS TAKEN FROM THE
WINSTON BLVD. BRIDGE LOOKING
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SHEET 7
SAMPLE PHOTOS OF REVEGETATED CHANNEL SLOPES USING AN
INTERLOCKING FLEXIBLE PRE-CAST BLOCK REVETMENT SYSTEM.
(PROJECT LOCATED IN MT. AIRY, NC)