20090277 Ver 1_401 Application_20090309

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March 12, 2009
Ms. Laurie Dennison
North Carolina Department of Environment
and Natural Resources (NC-DWQ)
Division of Water Quality
401/Wetland Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Re: Preconstruction Notification Application Form for
Streambank Stabilization at:
Dixon Drive, Raleigh, NC 27628
Dear Ms. Dennison:

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Please find enclosed five copies of a completed "Preconstruction Notification Application Form" for the
referenced project. I am submitting one copy of this application concurrently to Mr. Monte Mathews with
the United States Army Corps of Engineers.
This stream stabilization project impacts less than 500 linear feet and meets the criteria established under
the US Army Corps Nation wide (NWP 13) Permit. This stream is subject to the Neuse River Riparian
Area Protection Rules and the proposed stabilization activities are not exempt under Neuse Riparian Buffer
Protection Rules - Rule .0233 (15A NCAC 213.0233). Therefore written concurrence from NC-DWQ is
sought per conditions established in Condition 6 under NC-DWQ's General Permit - GC3495.
We are also attaching a check for a total of $810.00. The check is the total for this project and another
PCN being submitted along with this application (unrelated project). The fees apportionment is as follows:
Dixon Drive: $240.00
Upper Longview: $570.00
Thank you for your assistance in processing this application. If I may answer any questions concerning the
application, please contact me at [phone].
Sincerely
M ? Q,-?
Sheila Thomas-Ambat
Stormwater Project Engineer
STA/
Enclosures
cc: Mr. Monte K. Matthews
OFFICES • 222 WEST HARGETT STREET • POST OFFICE BOX 590 • RALEIGH, NORTH CAROLINA 27602
RECYCLED PAPER
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March 12, 2009
Mr. Monte K. Matthews
Raleigh Regulatory Field Office
U. S. Army Corps of Engineers
3331 Heritage Trade Drive
Suite 105
Wake Forest, NC 27587
Re: Preconstruction Notification Application Form for
Streambank Stabilization at:
Dixon Drive, Raleigh, NC 27628
Dear Mr. Matthews:
Please find enclosed one copy of a completed "Preconstruction Notification Application Form"
for the referenced project. This stream stabilization project impacts less than 500 linear feet and
meets the criteria established under the US Army Corps Nation Wide (NWP 13) Permit.
I am submitting five copies of this application concurrently to Ms. Laurie Dennison with the
North Carolina Department of Environment and Natural Resources, Division of Water Quality,
401 Wetlands Unit.
Thank you for your assistance in processing this application. If I may answer any questions
concerning the application, please contact me at [phone].
Sinc 1 ,
Sheila Thomas-Ambat
Stormwater Project Engineer
STA/
Enclosures
cc: Ms. Laurie Dennison
OFFICES • 222 WES i HARGFTT STREET • POST OFFICE BOX 590 • RAI SIGH. NORTH CAROLINA ?_7602
RFCYCI_ED PAPER

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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.0 November 2008
Pre-Construction Notification (PCN) Form
A. Applicant Information
P A ir
1. Processing ? ?_
1 a . Type(s) of approval sought from the
Corps:
®Section 404 Permit E] Section 10 Permit
1 b . Specify Nationwide Permit (NWP) number: NW 13 or General Permit (GP) number:
1 c. Has the NWP or GP number been verified by the Corps? ? Yes ® No
1 d . Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ® Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ® Riparian Buffer Authorization
le. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes ® No For the record only for Corps Permit:

? Yes ® No
1f. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ? Yes ® No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below. ? Yes ® No
1h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
2. Project Information
2a. Name of project: 100 & 5999 Dixon Drive
2b. County: Wake
2c. Nearest municipality / town: Raleigh
2d. Subdivision name: N/A
2e. NCDOT only, T.I.P. or state

project no: N/A

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3. Owner Information La ?,
1
3a. Name on Recorded Deed: Northclift Townhome Association c\o J.J. Andrews MAR 1 8; 0
3b.
3c. Deed Book and Page No.
Responsible Party (for LLC if
applicable): DB 02212 PG 0279 DENR • WATER 00AL1; Y
3d. Street address: P.O. Box 6053
3e. City, state, zip: Raleigh, NC 27628
3f. Telephone no.: 919-755-0864
3g. Fax no.:
3h. Email address:
Page 1 of 13
PCN Form - Version 1.0 November 2008 Version
Section A. Applicant Information, continued
4. Applicant Information (if different from owner)
4a. Applicant is: ? Agent ® Other, specify: City of Raleigh performing repairs under city program
4b. Name: Mr. Danny Bowden, P.E.
4c. Business name
(if applicable): City of Raleigh Public Works Department
4d. Street address: 222 West Harget Street PO BOX 590, RM 301
4e. City, state, zip: Raleigh, NC 27602
4f. Telephone no.: 919-890-3030
4g. Fax no.: 919-890-3832
4h. Email address: [e-mail]
5. Agent/Consultant Information (if applicable)
5a. Name: Becky L. Ward, PE
5b. Business name
(if applicable): Ward Consulting Engineers, P.C.
5c. Street address: 8386 Six Forks Road Ste 101
5d. City, state, zip: Raleigh, NC 27615-5088
5e. Telephone no.: 919-870-0526
5f. Fax no.: 919-870-5359
5g. Email address: [e-mail]
Page 2 of 13
PCN Form - November 2008 Version
B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): 1706382826
1b. Site coordinates (in decimal degrees): 35.51.27`N - 78.39.01`W
1 c. Property size: 3.26 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to
proposed project: UT to Mine Creek
2b. Water Quality Classification of nearest receiving water: C:NSW
2c. River basin: Neuse River Basin
Page 3 of 13
PCN Form - Version 1.0 November 2008 Version
B. Project Information and Prior Project History
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
The stream is a unnamed tributary to Mine Creek. The stream is located directly behind an existing townhome
development. The watershed is mostly made up of multi-family and single-family residences. A small amout of
commercial space exists in the eastern portion of the watershed. The segment of UT to Mine Creek that is included in this
study is located between the second and third building from the western entrance into the Northdift Townhome complex.
An outside bend in the stream is located adjacent to the rear of the buildings. The stream is currently approximately 10
feet southwest of the existing deck. The banks are currently steep and eroding at this location. It is the concern of the
Homeowners association that as the stream bend continues to migrate it will reach the the existing deck structure and
also cut off access to the rear of the building for owners to carry their trash to the street.
Currently the buffer is mowed to the top of the existing bank on the eastern side where the townhomes are located. The
southwestern bank buffer is forested. Beyond the southwest buffer is a sanitary sewer easement. Several multi stem
trees are to be removed along the north east stream bank. This existing vegetation is either currently undermined or in
the vicinity of proposed grading operations to slope back the banks. The UT has incised over time due to the
development stressors and maintained stream buffer. Larger than bankfull storm events are now contained within the
channel causing higher shear stresses on the stream banks. The north eastern stream bank is the primary concern as it
is located on an outside bend of the stream and is severely eroding. The stream has eroded down to bedrock in much of
the repair reach. The Wake County Soil Survey classifies the soils in the area as Chewacla and Cecil Sandy Loam.
Sandy Loam Soils have a non-erosive velocity of 2.5 ft/sec. With an existing stream slope of 1.07%, the expected channel
velocities of 5.5 ft/sec are erosive to the insitu soils.
3b. List the total estimated acreage of all existing wetlands on the property:
No wetlands exist within the project area.
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
The property owned by the Townhome Association includes approximately 1460 LF of UT to Mine Creek, which is a
perennial stream.
3d. Explain the purpose of the proposed project:
The purpose of this project is to stabilize the currently severely eroding stream banks and to prevent future damage to
structures located in dose proximity to the stream. The repair of the stream banks will prevent future sediment deposition
into the stream. Other goals of the project are to improve the channel eroded dimensions and provide for better
vegetation stability on the stream bank face and buffer.
3e. Describe the overall project in detail, including the type of equipment to be used:
The project will consist of stream bank stabilization along the northern bank for approximately 72 linear feet. The existing
stream profile and alignment will be utilized in the design. The bankfull channel dimensions will be adjusted to provide
better access of the channel to its floodplain. This access will be provided for on the southeastern floodplain as the
existing ground will be graded to create a new floodplain at bankfull elevation. This will allow for high flows to expand onto
the floodplain reducing the shear stress on the proposed Vegetated Geogrids (VGG) proposed for the northern stream
bank. The Vegetated Geogrids are a soil lift planted with vegetation on one foot centers between each lift. The VGG will
be constructed on a rock toe comprised of Class II Riprap for stability. The VGG will begin at three lifts high at the
upstream end of the project and transition to a one foot lift futher downstream as shown on the plans. The total stream
length of soil lifts will be 39 feet. The bank will be graded back to a 2H:1 V slope at the end of the geogrids for a distance
of 21 feet down stream.The bank 2H:1V stream bank slope improvements will tie into the existing bank at a stable section
of the stream at the end of the project. Rip rap will be used on the ends of the VGG and the project tie in downstream end
to bankfull elevation to transition the project at critical points. Vegetation will be placed in two rows alternatively spaced, 5'
on center, at the top of the stream bank repairs. One temporary construction crossing will be utilized in an area of a
bedrock outcrop to convey construction equipment across the stream as shown on plan sheet 1. Construction access will
be from the existing parking lot. It is anticipated that this work will take approximately one week to complete. The low flow
water will be pumped around the work site during construction. It is anticipated that earthmoving equipment and various
other support apparatus will be used on this project. Heavy equipment may include hydraulic excavators, compactors,
bulldozers, skidsteer loaders, and material hauling apparatus such as a dump truck.
Page 4 of 13
PCN Form - November 2008 Version
IJ. Project Information and Prior Project History
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
? Yes ? No ® Unknown
4b. If the Corps made the jurisdictional determination, what type
of determination was made?
? Preliminary ? Final
4c. If yes, who delineated the jurisdictional areas?
Name (if known): Agency/Consultant Company:
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past? ? Yes
? No Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project? ? Yes ® No
[6b. If yes, explain.
Page 5 of 13
PCN Form - November 2008 Version
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
? Wetlands ® Streams - tributaries ® Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of Type of wetland Forested (Corps - 404, 10 Area of impact (acres)
Permanent (P) or impact (if known) DWQ - non-404, other)
Temporary
W1 ? P ? T ? Yes ? No ? Corps
? DWQ
W2 ? P ? T ? Yes ? No ? Corps
? DWQ
W3 ? P ? T ? Yes ? No ? Corps
? DWQ
W4 ? P ? T ? Yes ? No ? Corps
? DWQ
W5 ? P ? T ? Yes ? No ? Corps
? DWQ
W6 ? P ? T ? Yes ? No ? Corps
? DWQ
2g. Total wetland impacts 0
2h. Comments: No impacts will occur to any wetlands on site.
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f.
Stream impact Type of Stream name Perennial (PER) or Average stream width (feet) Impact
number - impact intermittent (INT)? length
Permanent (P) or (linear feet)
Temporary (T)
Bank
S1 ® P ? T stabilizati UT to Mine Creek ® PER ? INT 13 72
on
S2 ? P ? T ? PER ? INT
S3 ? P ? T ? PER ? INT
S4 ? P ? T ? PER ? INT
S5 ? P ? T ? PER ? INT
S6 ? P ? T ? PER ? INT
3g. Total stream and tributary impacts 72
3h. Comments: The impacts will occur for bank stabilization along a reach that is degrading close to an existing structure.
Page 6 of 13
PCN Form - Version 1.0 November 2008 Version
C. Proposed Impacts Inventory, continued
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individual) list all o en water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of
impact number wterbody Type of impact Waterbody type Area of impact (acres)
- Permanent (if
(P) or applicable)
Temporary T
01 ?P?T
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts 0
4g. Comments: No open water impacts will occur with this project.
Page 7 of 13
PCN Form - November 2008 Version
C. Proposed Impacts Inventory, continued
5. Pond or Lake Construction
If and or lake construction pro osed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.

Pond ID
Proposed use or Wetland Impacts (acres) Stream Impacts (feet) Upland

number (acres)
purpose of pond
Flooded Filled Excavated Flooded Filled Excavated Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then ou MUST fill out Section D of this form.
6a.
® Neuse ? Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number-
Permanent (P) Reason
for impact
Stream name Buffer
mitigation Zone 1 impact (square
feet) Zone 2 impact
(square feet)
or Temporary required?
B1 ®P ? T Benching UT to Mine Creek ? Yes ® No 666 0
B2 ®P ? T Grading UT to Mine Creek ? Yes ® No 762 0
B3 ? PH T Access Ut to Mine Creek ? Yes ® No 553 982
6h. Total buffer impacts 1981 982
6i. Comments: The existing buffer is mowed to the top of bank. The stabilization will include the revegetation of the banks
and top of buffer on the north side. This stabilization will introduce vegetation on the bank and at the top of the stream for
approximately 5 feet where there is currently very little woody vegetation. The benching area will be replanted with
vegetation as well.
Page 8 of 13
PCN Form - November 2008 Version
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1 a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Avoidance with this project is not an option due to the current state of the stream bank at this location and the future
potential to cause structural damage. The project will be isolated to the segment of stream that is causing the erosion
problems adjacent to the building structure. The project was minimized to a suitable length to transition this area on the
upstream and downstream length. Minimal work is being completed on the south bank in cutting the floodplain bench and
this area will be revegetated. The largest tree to be removed from this project is 12 inches in diameter. The Vegetated
Geogrids were selected for design to provide structural stability and integration of vegetation within limited space. The
planting of vegetation at the top of the bank will re-establish some buffer in a currently maintained area. The streambank
planting of woody vegetation will provide longterm bank stability.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
The proposed impacts will be minimized through the use of proper dewatering and pump around measures. The
temporary stream crossing will be placed on a existing bedrock outcrop to minimize damage to the channel bed
elevations during removal operations. The use of natural materials of rock, fabric, soils, and vegetation will be
incorporated to provide structural stability of the stream bank just after its construction and in the long term as the
vegetation matures.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for ? Yes ® No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ? DWQ ? Corps

2c. If yes, which mitigation option will be used for this ? Mitigation bank
project? El Payment to in-lieu fee program
? Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter) Type
7
Quantity
3c. Comments:
4. Complete if Making a Payment to In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ? Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: warm, cool, cold
4d. Buffer mitigation requested (DWQ only): square feet
4e. Riparian wetland mitigation requested: acres
4f. Non-riparian wetland mitigation requested:
acres
4g. Coastal (tidal) wetland mitigation requested:
acres
4h.. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
Page 9 of 13
PCN Form - Version 1.0 November 2008 Version
D. Impact Justification and Mitigation, continued
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ? Yes ® No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone Reason for impact Total impact
(square feet) Multiplier Required mitigation
(square feet)
Zone 1 3 (2 for Catawba)
Zone 2 1.5
Total buffer mitigation required:
6c. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
6d. Comments:
Page 10 of 13
PCN Form - November 2008 Version
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
I a. Does the project include or is it adjacent to protected riparian buffers identified
i
hi ? Yes ® No
w
t
n one of the NC Riparian Buffer Protection Rules?
1 b. If yes, then is a diffuse flow plan included? ? Yes ? No
2. Determination if the Project Requires a Stormwater Management Plan
2a. Does the project require a Non-404 Jurisdictional General Permit? ? Yes ® No
2b. Is the project subject to General Certification 3704 or 3705? ? Yes ® No
3. Determination of Stormwater Review Jurisdiction
3a. Is this project subject to any of the following state-implemented stormwater ? Coastal counties
management programs (check all that apply)? ? HQW
If so, attach one copy of the approval letter from the DWQ and one copy of the ? ORW
? Session Law 2006-246
approved stormwater management plan. ? Other:
3b. In which local government's jurisdiction is this project? City of Raleigh
3c. Is this local government certified to implement a state stormwater program? ® Yes ? No
If so, attach one copy of the approval letter from the local government and one copy
f th ?/VOT 5 v6 ?J >= 0T- Tp A
o
e approved stormwater management plan (or one copy of the approved
Stormwater management plan stamped as approved). rat_ l" J)
4. Information Required for DWQ 401 Unit Stormwater Review
4a. What is the overall percent imperviousness according to the most current site plan? N/A
4b. Does this project contain any areas that meet the criteria for "high density" per
General Certifications 3704 and 3705? ? Yes ? No
4c. If the site is over 24% impervious and/or contains high density areas, then provide a brief narrative description of the
stormwater management plan.
4d. Has a completed BMP Supplement Form with all required items been submitted
for each stormwater BMP? ? Yes ? No
Page 11 of 13
PCN Form - Version 1.0 November 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the
use of public (federal/state) land? ®Yes ? No
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ? Yes ® No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.) ? Yes ? No
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ? Yes ® No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after-the-fact permit application? ? Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in
additional development, which could impact nearby downstream water quality? ?Yes No
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
N/A
Page 12 of 13
PCN Form -Version 1.0 November 2008 Version
F. Supplementary Information, continued
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
h
bit
? ® Yes No
?
a
at
5b. Have you checked with the USFWS concerning Endangered Species Act
i
t
? ® El Yes No
mpac
s
5c. If yes, indicate the USFWS Field Office you have contacted. ? Raleigh
? Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
The site is in an existing urban residental area that has been previously impacted by development. Bald Eagles prefer
much larger bodies of water. Michauz's sumac prefers open areas and are relatively shade intolerant - Since the site is
forested there should not be any associated T/E issues. Other open areas on site are currenlty being mowed.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? T[:] Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
status (e.g., National Historic Trust designation or properties significant in
? Yes No
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
8. Flood Zone Designation (Corps Requirement)
Will this project occur in a FE MA-designated 100-year floodplain?
[ ? Yes ® No
8b.
yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination? Wake County FEMA Maps
Danny Bowden, P.E. i j f (?rJ
i
Applicant/Agent's Printed Name pp icant/Ag nt's ignature
(Agent's signature is valid only if a authorization letter from the applicant Date
is provided.)
Page 13 of 13
PCN Form - November 2008 Version
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Raleigh West Quadrangle, North Carolina - Wake County
7.5 Minute Series (Topographic)
Scale: 1 inch e 2,000 feet
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Dixon Drive, Raleigh, NC 27628
Scale: 1 inch = 403 feet
Online Source: Wake County and the City of Raleigh IMAPS, North Carolina

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Source: Wake County and the City of Raleigh IMAPS
Scale: 1 inch =146 feet
Cm: Chewacla (Flood Prone Soils), ApC2: Appling Sandy Loam, ApD: Appling Sandy
Loam, CeF: Cecil Sandy Loam, CgC2: Cecil Gravelly Sandy Loam,
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WAKE COUNTY AND THE CITY Or RALEIGH
Nap created on 12/19/200812:01:23 PM
Copyright 2008. City of Raleigh, Wake County.
PA111 J I &
WAKE
(Y)U N 11'
ADDR3:
DEED BOOK:
DEED PAGE:
DEED DATE:
DEED ACRES:
BLDG VAL:
LAND VAL:
BILLING CLASS:
0090305
NORTHCLIFT
TOWNHOUSE ASSOC %J
J ANDREWS
%JJANDREWS
PO BOX 6053
RALEIGH NC 27628-6053
02212
0279
1 /1 /9999
3.26
0
200
DESCRIPTION: NORTHCLIFT VILL SEC-1
BM1974-7
MAP NAAAE: 170606
PIN NUM: 1706382826
PIN EXT: 000
CITY: RAL
TOWNSHIP: HOUSE CREEK
YEAR BUILT: 1974
SALEPRICE: 0
SALEDATE:
TYPE USE: Bath House
DESIGN STYLE: Conventional
UNITS: 0
LAND CLASS: HOMEOWNERS ASSOC.
OLD PARCEL NUMBER: 379-00000-1038
RALEIGH SITE ADDRESSES 1
STREET NUN, 6998
STREET SUITE:
STREET DIR PRE:
STREET NAME: DIXON
STREET TYPE: DR
STREET DIR SUF:
ADDRESS TYPE: Parcel
ADDRESS STATUS

CODE DESCR: ACTIVE
Creeks and Rivers
Wake County
Elevation Contours
Topo
Streets
¦ Lakes
Parcels
Security Screen
2005 Color Orthos:
County-wide (zoom t(
Neel
1:1 Wake County
Boundary
2/26/2009 10:43 AM
0 101 ft
Photo Log
6989 Dixon Drive
Beginning of project at
Existing Sanitary Sewer Line
Looking Upstream. Vegetated
Geogrids will tie in on left
bank just below Utility Line.
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Vegetated Geogrid Soil Lift
The Vegetated Geogrid consists of constructed soil lifts used to rebuild eroded slopes. Each lift
of soil is wrapped in a non-biodegradable Turf Reinforcement Mat (TRM).
Turf Reinforcing Matt
The composite turf reinforcement mat (C-TRM) shall be a machine produced mat of 100%
coconut fiber matrix incorporated into a permanent three dimensional netting structure.
The matrix shall be stitch bonded between a heavy duty UV stabilized bottom net with 0.50 x
0.50 inch (1.27 x 1.27 cm) openings, a heavy duty UV stabilized, dramatically cuspated
(crimped) intermediate netting with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings, and a super
heavy duty UV stabilized top net with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings. The cuspated
netting shall form prominent closely spaced ridges across the entire width of the mat. The three
nettings shall be stitched together on 1.50 inch (3.81 cm) centers with UV stabilized
polypropylene thread to form a permanent three dimensional structure. All mats shall be
manufactured with a colored thread stitched along both outer edges (approximately 2-5 inches
[5-12.5 cm] from the edge) as an overlap guide for adjacent mats.
Material Content
Matrix 100% Coconut Fiber (0.50 lb/ sq yd) (0.27 kg/sq m)
Nettings Top -Heavy UV Stabilized Polypropylene 0.50 lbs/1,000 sq ft(4.15 kg/100 sq m)
Mid -Super heavy UV Stabilized Polypropylene 201b/1,000 sq ft(10.21 kg/100 sq m)
Bottom - Heavy UV Stabilized Polypropylene 8.50 lbs/1,000 sq ft(4.15 kg/100 sq m)
Thread UV Stabilized Polypropylene
Physical Specifications (per roll)
En lish Metric
Width 6.50 ft 2.00 in
Length 55.50 ft 16.90 in
Weight 37.00 lbs f 10% 16.80 kg
Area 40.00 yd2 33.40 m2
Stitch Spacing 1.50 in 3.81 cm
The composite turf reinforcement mat (C-TRM) shall be a machine produced mat of 100%
coconut fiber matrix incorporated into a permanent three dimensional netting structure. The
matrix shall be stitch bonded between a heavy duty UV stabilized bottom net with 0.50 x 0.50
inch (1.27 x 1.27 cm) openings, a heavy duty UV stabilized, dramatically cuspated (crimped)
intermediate netting with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings, and a super heavy duty UV
stabilized top net with 0.50 x 0.50 inch (1.27 x 1.27 cm) openings. The cuspated netting shall
form prominent closely spaced ridges across the entire width of the mat. The three nettings shall
be stitched together on 1.50 inch (3.81 cm) centers with UV stabilized polypropylene thread to
form a permanent three dimensional structure.
Biaxial Geotextile Matt
The biaxial geotextile matt shall be composed of a high molecular weight, high tenacity
polyester multifilament yarns which are woven in tension and finished with a PVC coating. The
matting shall be inert to biological degradation and resistant to naturally encountered chemicals,
alkalis, and acids.

Mechanical Properties
Test Method
Unit Minimum Average Roll
Value
MD CD
Tensile Strength (at ultimate) ASTM D 6637 kN/m lbs/ft 29.2 (2000) 29.2 2000)
Tensile Strength (at 1% strain) ASTM D 6637 kN/m lbs/ft 4.4 (300) 4.4 (300)
Tensile Strength (at 2% strain) ASTM D 6637 kN/m lbs/ft 7.3(500) 7.3 (500
Tensile Strength (at 5% strain) ASTM D 6637 kN/m lbs/ft 13.4 920 13.4 (920
Tensile Modulus (at 1% strain)
ASTM D 6637
kN/m lbs/ft 437.8
30000 437.8
(30000
Uv Resistance (at 500 hours ASTM D 4355 % Strength
retained 70
Physical Properties Test Method Unit Typical Value
Percent Open Area COE CW-
02215 % 70
Grid Aperture Size (MD) -- mm (in) 25.4(l.0)
Grid Aperture Size (CMD) -- mm (in) 25.4(l.0)
Mass/Unit Area ASTM D 5261 g/m2 (oz/yd) 308.5 (9.1)
Roll Dimensions (width x
length)
'-
in (ft)
4(13.1) x 50 (164)
Roll Area -- m2 (yd2) 200(239)
Estimated Roll Weight -- kg (lbs) 80(176)
Plants
Plants are listed in planting specification Section 6.0 and shall be included in the cost of the soil
lifts.
Installation
¦ STEP 1: The baseline condition for the Vegetated Geogrids (VGG) is a gabion basket
stabilized streambank slope toe, with a level plateau of compacted soil or gravel back-fill
extending from the rear face of the installed gabion basket landward to the parent soil
material. Due to the porous nature of the gabion baskets, a woven geotextile filter fabric
is attached and fastened to the entire top surface of the installed gabion baskets, as well as
any exposed gabion basket face on the landward side of the baskets.
¦ STEP 2: Dormant or bare root woody plant material is installed on the geotextile filter
fabric, perpendicular to stream flow, with the tips of the plant materials extending
approximately one (1) foot beyond the stream ward edge of the stabilized toe. Spacing of
the plant material, unless otherwise specified, is on one (1) foot centers. A thin layer of
pulverized topsoil one (1) to two (2) inches in depth is then placed on top of the installed
plant material to insure immediate and complete soil contact and coverage of exposed
roots. The installed soil is then lightly tamped in place with a plate compactor.
STEP 3: The TRM is laid out parallel to the stream flow, with the mid-point of the
width of the TRM centered on the stabilized toe. The finish surface of the TRM is placed
face-down. At locations, where the horizontal width of the installed VGG will exceed six
(6) feet, a biaxial geotextile fabric will be installed in lieu of the TRM to provide internal
slope stabilization. Areas treated with the biaxial geotextile fabric will be compacted to a
95% Proctor Density
STEP 4: Soil fill is placed on the landward half of the TRM to create a soil lift, that
when compacted with a portable plate compactor to approximately an 75% Proctor
Density, will be approximately twelve (12) inches high in vertical elevation. The stream
ward face of this soil lift is left uncompacted, but is hand tamped to a roughly 1:1 slope.
STEP 5: The portion of the TRM extending beyond the stabilized toe is then temporarily
pulled back uniformly towards the streambank. The soil along the front radius of the
VGG is then hand tamped. The TRM is then pulled back towards the stream to allow the
radius of the VGG that will be exposed upon completion to be seeded with the project
specified seed mix. The TRM is then pulled back towards the streambank, using uniform
pressure, and then staked in place with 6-inch turf staples.
STEP 6: Steps 2, 3, 4, and 5 are repeated on successive VGG lifts to meet the final
project specification.
See figures 1 through 5 on the plans that illustrate the installation procedure described the
above steps.
Erosion Control Matting / Coconut Fiber (Coir) Blanket
Description
The coconut fiber channel lining shall be a machine-produced 100% biodegradable mat.
The blanket shall be of consistent thickness with the coconut fiber evenly distributed over
the entire area of the mat. Coconut Fiber Blankets will only be used in locations specified
by the Engineer. Locations will be on all disturbed streambanks prior to turning the
streamflow into the newly constructed channel. Other problem areas may also require the
placement of coconut fiber blankets.
Materials
Coconut fiber matting shall be provided to meet the s ecifications rovided below
Matrix 100% Coconut Fiber
Weight 20 oz/SY 678 gm/m2)
Tensile Strength 1348 x 626 lb/ft minimum (1650.5 x 766.5
kg/m)
Elongation 34% x 38%
Open Area measured 50%
Thickness 0.30 inches minimum 7.6 mm
Flexibility m - cm 65030 x 29590
Recommended Flow 11 feet/second 3.35 m/s
Size 6.6 x 164 feet 120 SY) or 100 SM
"C" Factor 0.002
Stakes will be wooden stakes 12 in. (300 mm) in length with a notch cut l in. (25 mm)
from the top. These stakes shall be used to stake the matting along the slopes. Wooden 3
ft. stakes spaced approximately 4 ft. apart shall be used to secure the matting at the toe of
the slope. The toe stakes shall have a minimum 1-inch by 1-inch cross-section and shall
be designed so that the matting can not slide past the exposed end of the stake.
Construction Methods:
Provide a smooth soil surface free from stones, clods, or debris that will prevent the
contact of the matting with the soil. Place the matting immediately upon final grading.
Take care to preserve the required line, grade, and cross section of the area covered. All
cut slopes shall be stabilized at the end of each working day with erosion control matting.
Apply fertilizer, seed, lime, and straw mulching prior to installing the matting.
Unroll the matting and apply without stretching such that it will lie smoothly but loosely
on the soil surface. Bury the top slope end of each piece of matting in a narrow trench at
least 6 inches (150 mm) deep and tamp firmly. Where one roll of matting ends and a
second roll begins, overlap the end of the upper roll over the buried end of the second roll
so there is a 6 inches (150 mm) overlap. Construct check trenches at least 12 inches (0.3
m) deep every 50 feet (16 m) longitudinally along the edges of the matting or as directed
by the Project Engineer. Fold over and bury matting to the full depth of the trench, close
and tamp firmly. Overlap matting at least 6 inches (150 mm) where 2 or more widths of
matting are installed side by side.
Place stakes across the matting at ends, junctions, and check trenches approximately 1
foot (90.3 m) apart with notch facing upslope. Place stakes along the outer edges and
down the center of each strip of matting 3 feet (1 meter) apart. Place stakes along all
lapped edges 1 foot (0.3 m) apart. Refer to details in the plan sheets.
The Engineer may require adjustments in the trenching or staking requirements to fit
individual site conditions.
Basis of Payment
The quantity of "Erosion Control Matting/Coir Matting" measured as provided above
will be paid for at the contract unit price per square yard for "Erosion Control
Matting/Coconut Fiber (Coir) Blanket" and shall include all work and materials required
in this section. Payment for staples, stakes, and twine will be included in the contract unit
price for "Erosion Control Matting".
Payment will be made under:
Erosion control matting ............ ... Sy
..............................
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Manning's Equation Q=(1.486/n)*A*R^(2/3)*S"(1/2)
Cross Section 1 Cross Section 2
BKF E I e = 321.64 BKF Ele =F-32-0.-5-8-1
n = 0.035 n = 0.035
A = 18.75 A = 20.23
R = 1.41 R = 1.42
S=0.0107 S=0.0107
Q = 103.54 Q = 112.34
Cross Section 4 Cross Section 5
BKF Ele = 320.34 BKF Ele = 320.08
n = 0.035 n = 0.035
A=17.79 A=18.48
R= 1.42 R= 1.24
S=0.0129 S=0.0129
?Q= 108.21 Q= 102.71
Cross Section 3
BKF Ele =F-32-05-4--l
n = 0.035
A = 19.86
R = 1.40
S = 0.0107
?^ Q = 109.22