20030124 Ver 1_COMPLETE FILE_20030205

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February 7, 2003
Wake County
DWQ Project #: 03-0124
APPROVAL of 401 Water Quality Certification including ADDITIONAL CONDITIONS
City of Raleigh - Central Engineering Dept.
Attn: Mr. Carl Dawson, Jr.
Post Office Box 590
Raleigh, NC 27602
Dear Mr. Dawson:
You have our approval, in accordance with the attached conditions, to impact 15 feet of streambank
and .009 acres of buffers for the purpose of streambank stabilization at 4436 Oak Park Road as you
described in your application dated January 31, 2003. After reviewing your application we have
decided, this fill is covered by General Water Quality Certification Number 3353. This Certification
allows you to use Nationwide Permit Numbers 13 when the Corps of Engineers issues it. This approval
is also valid for the Neuse River buffer rules (15A NCAC 2B .0233). In addition, you should get any
other federal, state or local permits before you go ahead with your project including (but not limited to)
Sediment and Erosion Control, Coastal.Stormwater, Non-Discharge and Water Supply Watershed
regulations. Also this approval will expire when the accompanying 404 or CAMA permit expires
unless otherwise specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application. If you
change your project, you must notify us and send us a new application. If the property is sold, the new
owner must be given a copy of this Certification and approval letter and is thereby responsible for
complying with all conditions. This approval shall expire when the corresponding Nationwide Permit
expires or as otherwise provided in the General Certification. If total wetland fills for this project (now
or in the future) exceed one acre, compensatory mitigation may be required as described in 15A NCAC
2H.0506 (h). For this approval to be valid, you must follow the conditions listed in the attached
certification and those listed below.
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E., Director
Division of Water Quality
Upon completion of all work approved within the 401 Water Quality Certification or applicable
Buffer Rules, and any subsequent modifications, the applicant is required to return the attached
certificate of completion to the 401/Wetlands Unit, North Carolina Division of Water Quality,
1650 Mail Service Center, Raleigh, NC, 27699-1650.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory
hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing, send
a written petition, which conforms to Chapter 150B of the North Carolina General Statutes to the Office
of Administrative Hearings, P.O. Box 27447, Raleigh, N.C. 27611-7447. This certification and its
conditions are final and binding unless you ask for a hearing.
N. C. 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)
[phone] (phone), 919-733-6893 (fax), (http://h2o.enr.state.nc.us/ncwetlands
r
City Of 6Raleigh
5Vorth earolina
January 31, 2003
Mr. John Dorney 3 ?YF
North Carolina Department of Environment
And Natural Resources
Division of Water Quality
401/Wetlands Unit
1650 Mail Service Center
Raleigh, North Carolina 27699-1650
RE: Pre-Construction Notification Application Form for
Streambank Stabilization at:
4436 Oak Park Road
Raleigh, NC 27612-5628
Dear Mr. Dorney:
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SECTION
Please find enclosed seven copies of a completed "Pre-Construction Notification
Application Form" for the referenced project. I Aronl4ting one copy of this application
concurrently to Ms. Amanda D. Jones with the gni to Corps of Engineers.
As noted in the application, the repairs are to address e i of the driveway to
the property at 4436 Oak Park Road and to stabilize a short len h stream bank along
the left side of the channel, approximately 10 feet in length. Written approval is
sought solely for Buffer Rules, and thus the application fee does not apply for this
project.
Thank you for your assistance in processing this application. If I may answer any
questions concerning the application or if you or a member of your staff would like to
meet me for a site inspection, please contact me at telephone number [phone].
Sincerely,
James K. Leumas, P. E.
Stormwater Services Engineer
JKL/
Enclosures
cc: Mr. H. Daniel Bowden, P. E.
Ms. Veronica K. Erby
Ms. Amanda D. Jones
OFFICES • 222 WEST HARGETT STREET • POST OFFICE BOX 590 • RALEIGH, NORTH CAROLINA 27602
Recycled Paper
City Of CRaleigh
9Vorth Gvarolina
January 31, 2003
Ms. Amanda D. Jones
Raleigh Regulatory Field Office
United States Army Corps of Engineers
6508 Falls of Neuse Road
Suite 120
Raleigh, North Carolina 27615
RE: Pre-Construction Notification Application Form for
Streambank Stabilization at:
4436 Oak Park Road
Raleigh, NC 27612-5628
Dear Ms. Jones:
Please find enclosed one copy of a completed "Pre-Construction Notification Application
Form" for the referenced project. I am submitting seven copies of this application
concurrently to Mr. John Dorney with the North Carolina Department of Environment and
Natural Resources, Division of Water Quality, 401/Wetlands Unit. As noted in the
application, the repairs are to address the undermining of the driveway to the property at
4436 Oak Park Road and to stabilize a short length of stream bank along the left side of
the channel, approximately 10 feet in length.
Thank you for your assistance in processing this application. If I may answer any
questions concerning the application or if you would like to meet me for a site inspection,
please contact me at telephone number [phone].
Sincerely,
4M__1_ k' - ,?
James K. Leumas, P. E.
Stormwater Services Engineer
J KL/
Enclosure
cc: Mr. H. Daniel Bowden, P. E.
Ms. Veronica K. Erby
Mr. John Dorney
OFFICES • 222 WEST HARGETT STREET • POST OFFICE BOX 590 • RALEIGH. NORTH CAROLINA 27602
Hecvded Prapor
Pre-Construction Notification Application Form
Table of Contents
Project: Driveway Undermining and Stream Bank Stabilization
4436 Oak Park Road
Raleigh, NC 27612-5628
1. Pre-Construction Notification Application Form (Pages 5 of 13 through 13 of 13)
II. Vicinity Map (One Sheet)
III. United States Geological Survey 7.5-Minute Bayleaf Quadrangle Map, Photorevised
1987 with Drainage Area Delineated (One Sheet)
IV. Wake County Soil Survey, Issued November 1970, Map 38, with Drainage Area
Delineated (One Sheet)
V. Stream Bank Repair Summary - 4436 Oak Park Road (Two Sheets)
VI. Figures 1 and 2, Digital Pictures of Site (One Sheet)
VII. Figures 3 and 4 , Digital Pictures of Site (One Sheet)
VIII. Figure 5, City of Raleigh Geographic Information System Map Showing Property
Location and Plan View of Existing Problem Areas and Referencing Stream Impact Site
Number S-1 from Pre-Construction Notification Application Form, Section VI.3 on Page
9 of 13 (One Sheet)
IX. Figure 6, City of Raleigh Geographic Information System Map Showing Property
Location and Plan View of Proposed Repair Areas (One Sheet)
X. Figure 7, Typical Repair Section for Eroded Stream Bank (One Sheet)
Office Use Only: Form Version February 2002
USACE Action ID No. DWQ No.
If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A" rather than
leaving the space blank.
I. Processing
1. Check all of the approval(s) requested for this project:
® Section 404 Permit
? Section 10 Permit
? 401 Water Quality Certification
® Riparian or Watershed Buffer Rules
2. Nationwide, Regional or General Permit Number(s) Requested: NWP 13
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here:
4. If payment into the North Carolina Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (see section VIII - Mitigation), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: City of Raleigh
Mailing Address: Post Office Box 590
Central Engineering Department
Raleigh, NC 27602
Attention: Mr. Carl R. Dawson, Jr., P. E.
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: Carl.Dawson(a),ci.raleigh.nc.us
2. Agent Information (A signed and dated copy of the Agent Authorization letter must be
attached if the Agent has signatory authority for the owner/applicant.)
Name:
Company Affiliation:
Mailing Address:
Telephone Number:
E-mail Address:
Fax Number:
Page 5 of 13
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: 4436 Oak Park Road Streambank Stabilization Proiect
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0786.20 81 3955
4. Location
County: Wake Nearest Town: Raleigh
Subdivision name (include phase/lot number):Oak Park Subdivision/Lot D
Directions to site (include road numbers, landmarks, etc.): From downtown Raleigh, take
Glenwood Avenue (U. S. 70) going northwest. Take left turn (heading southwest) onto
Hollyridu Drive. Hollyridge Drive will "tee" into Oak Park Road. Turn left onto Oak
Park Road and go 0.32 mile. 4436 Oak Park Road is on the left side of the road at the
stream crossing culvert.
5. Site coordinates, if available (UTM or Lat/Long): Lat/Long 35°50' 36" / -78° 42' 07"
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Describe the existing land use or condition of the site at the time of this application:Existin
land use is 1/4-acre residential; site is a local unnamed intermittent stream channel that
drains into Crabtree Creek and is located approximately 500 feet upstream of the
confluence of the unnamed intermittent stream and Crabtree Creek.
7. Property size (acres):Lot size is 0.54 acre; streambank stabilization area is
approximately 0.01 acre.
8. Nearest body of water (stream/river/sound/ocean/lake): Tributary to Crabtree Creek
Page 6 of 13
9. River Basin: Neuse River
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://li2o.enr.state.nc.us/adinin/maps/.)
10. Describe the purpose of the proposed work: The purpose of the proposed work is to
stabilize a driveway that is being undermined and to stabilize a section of stream bank
(approximately 10 feet in length) on the left side of the channel adjacent to the driveway
that has eroded. Also, a small concrete drainage flume that discharges down the slope
will be replaced with a catch basin and slope drain that will discharge onto existing
riprap.
11. List the type of equipment to be used to construct the project: Because of the steep slope, a
track-mounted backhoe with a 20- to 25-foot reach is expected to perform
shaping/grading activities and materials placement. A dump truck will be used for
disposition of materials. All work is expected to be performed from the driveway.
Placement of ripray materials in the 15-foot eroded channel section located
immediately downstream of the concrete flume is to be placed with the track-mounted
backhoe from the driveway (i. e., from the top of the slope) and supplemented by hand
placement of stones so construction equipment will not need to get in the channel.
Work is to be performed only on the left side of the channel adjacent to the driveway
for 4436 Oak Park Road. No work is to be performed on the right side of the channel.
The driveway is to be replaced following construction.
12. Describe the land use in the vicinity of this project: Residential, single-family homes on
1/4-acre to 1/2-acre lots. Oak Park Swim Club is located immediately upstream of Oak
Park Road from this property.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules.
N/A
Page 7 of 13
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
None anticipated.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must be shown on a
delineation map, whether or not impacts are proposed to these systems. Wetland and stream
evaluation and delineation forms should be included as appropriate. Photographs may be
included at the applicant's discretion. If this proposed impact is strictly for wetland or stream
mitigation, list and describe the impact in Section VIII below. If additional space is needed for
listing or description, please attach a separate sheet.
Provide a brief written description of the proposed impacts: There are no indicators of
wetlands on the site. A field investigation by staff of the City of Raleigh Central
Engineering Department/Stormwater Services Division was made to determine the
severity of the streambank erosion and sedimentation as a result of the erosion. Please
see the enclosed report titled "Stream Bank Repair Summary - 114436 Oak Park Road"
for a narrative including digital photographs of the site.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
(indicate on ma)
Type of Impact* Area of
Impact
(acres) Located within
100-year Floodplain**
(es/no) Distance to
Nearest Stream
(linear feet)
Type of Wetland***
N/A

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: mechanized clearing, grading, fill,
excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http:;/www.1enia.,,,o,,!.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.)
Page 8 of 13
List the total acreage (estimated) of all existing wetlands on the property: 0.0 acres
Total area of wetland impact proposed: 0.0 acres (No indicators of wetlands observed.)
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
(indicate on ma
Type of Impact* Length of
Impact
(linear feet
Stream Name** Average Width
of Stream
Before Impact Perennial or
Intermittent?
(please secif
S-1 (See Stabilization 10 UT-Crabtree Creek - 8-Foot Intermittent per
Enclosed Report) Bottom Width 1970 Wake County
Soil Survey
And Raleigh West
USGS Quad Map

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is
proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usas..ov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mapquest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: 15 linear feet
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
(indicate on ma)
Type of Impact* Area of
Impact
(acres) Name of Waterbody
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.
N/A

List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. Pond Creation N/A
If constriction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any snaps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.): N/A
Page 9 of 13
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts.
This streambank stabilization project is intended to stabilize a driveway that is being
undermined and to stabilize a section of stream bank (approximately 10 feet in length) on
the left side of the channel that has eroded adjacent to the driveway at 4436 Oak Park
Road. Standard protection measures will be used during construction to minimize erosion
and off-site sedimentation in accordance with the "North Carolina Erosion and Sediment
Control Planning and Design Manual" prepared by the North Carolina Department of
Environment and Natural Resources. If left uncorrected it is expected that further erosion
of soils from beneath the driveway will occur and likely fail the driveway.
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCWRP concurrence shall be placed on hold as
incomplete. An applicant may also choose to review the current guidelines for stream restoration
Page 10 of 13
in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwctlands/strmgide.litml.
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
N/A
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP) with the NCWRP's written agreement. Check the box indicating that
you would like to pay into the NCWRP. Please note that payment into the NCWRP must be
reviewed and approved before it can be used to satisfy mitigation requirements. Applicants
will be notified early in the review process by the 401/Wetlands Unit if payment into the
NCWRP is available as an option. For additional information regarding the application
process for the NCWRP, check the NCWRP website at littn://li2o.enr.state.nc.us/wm/index.litni. If
use of the NCWRP is proposed, please check the appropriate box on page three and provide
the following information:
Amount of stream mitigation requested (linear feet): N/A
Amount of buffer mitigation requested (square feet): N/A
Amount of Riparian wetland mitigation requested (acres): N/A
Amount of Non-riparian wetland mitigation requested (acres): N/A
Amount of Coastal wetland mitigation requested (acres): N/A
IX. Environmental Documentation (DWQ Only)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No ?
If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a
copy of the NEPA or SEPA final approval letter.
Yes ? No ?
Page 11 of 13
X. Proposed Impacts on Riparian and Watershed Buffers (DWQ Only)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
Identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer
mitigation is required calculate the required amount of mitigation by applying the buffer
multipliers.
Zone* Impact
(square feet) Multiplier Required
Mitigation
1 396 3
2 0 1.5
Total 396
* Zone I extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or .0260.
N/A
XI. Stormwater (DWQ Only)
Describe impervious acreage (both existing and proposed) versus total acreage on the site.
Discuss stormwater controls proposed in order to protect surface waters and wetlands
downstream from the property.
Existing impervious acreage includes the house and drivewav on the property. These
features account for approximatelv 12.8 percent of the total property acreage of 0.54 acre.
No additional impervious surfaces are to be constructed. Erosion and sediment control
measures, such as silt fencing, are to be used during construction to minimize the potential
for off-site sedimentation during construction activities.
Page 12 of 13
XII. Sewage Disposal (DWQ Only)
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
XIII. Violations (DWQ Only)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H.0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
XIV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
I L?, 105
Applicant/Agent's Signa r Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
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City Of (Raleigh
5Vorth Carolina
Stream Bank Repair Summary - 4436 Oak Park Road
INTRODUCTION
This narrative supplements the Pre-Construction Notification Application for the
referenced project. The City of Raleigh is submitting this stream bank repair request on
behalf of Mr. Walter Pfieffer, the owner of the property at 4436 Oak Park Road. The City
of Raleigh Stormwater Drainage Policy Resolution (1998)-833 is a cost-share program
that provides financial and technical assistance in alleviating severe erosion, structural
flooding and/or public nuisances on fully-developed private property. This policy is
available to citizens within the City of Raleigh's corporate limits.
PROJECT SCOPE
An unnamed tributary in the Crabtree Creek watershed runs through the referenced
property. The driveway leading to the residence has experienced severe undermining.
Also, there has been erosion along a section of the stream channel on the left side for a
length of approximately 10 feet, just downstream from a concrete flume that discharges
water off the driveway down the slope to the channel. Site inspections were performed
by staff of the City of Raleigh Central Engineering Department, Stormwater Services
Division. The enclosed digital photographs (Figures 1 through 4) depict findings of the
site inspection.
The area described below was selected as the primary focus of the proposed repairs:
DESCRIPTION PROBLEM
Undermining of Driveway undermined likely from poorly compacted
Driveway fill material; problem exacerbated from surface water flow
over driveway in this location.
10 linear feet of Severe erosion has occurred along the stream
stream channel channel just downstream from riprap at the outlet of
erosion an existing concrete flume that discharges flow from
an area of approximately 0.77 acre to the channel.
OFFICES •'_'22 %^IFST HARGETT STREET • POST OFFICE 130X ::90 • NALEIGH. NORTH CAROLINA 27602
Hecyded 11 mei
Stream Bank Repair Summary
4436 Oak Park Road
Page Two
PROPOSEDIMPROVEMENTS
The City of Raleigh proposes to:
1. remove approximately 120 linear feet of driveway;
2. remove poorly compacted soils from beneath the driveway;
3. replace with suitable structural fill;
4. install 4-inch diameter corrugated plastic pipe gutter slope drains for two
gutters from the property at 4440 Oak Park Road that will discharge onto a
small riprap pad;
5. remove the existing concrete flume;
6. install a City of Raleigh standard catch basin in place of the flume with a 12-
inch diameter corrugated HDPE pipe slope drain that will discharge onto the
existing riprap; and
7. stabilize the eroded channel immediately downstream of the existing riprap
for the existing concrete flume by reinforcing the left (facing downstream) side
slope of the channel with filter fabric and riprap for a length of approximately
10 feet. The USGS Raleigh West 7.5-Minute Quadrangle map dated
photorevised 1987 indicates that the unnamed tributary to Crabtree Creek is
intermittent. The Wake County Soil Survey issued in November 1970 also
indicates that the stream is an intermittent stream. The drainage area of the
channel at the outlet of the 72-inch diameter corrugated metal pipe culvert
beneath Oak Park Road is approximately 381 acres; and
8. replace approximately 120 linear feet of driveway.
The work will be performed from the driveway long the left side of the channel. It is
anticipated that a track-mounted backhoe with a 20-foot to 25-foot reach will be used,
and the backhoe will be able to perform the work from the driveway and will not need to
go down the slope. Riprap would be able to be placed with the reach of the backhoe
bucket, supplemented by hand placement where necessary. Figure 5 shows a plan view
of the existing conditions; Figure 6 shows a plan view of the proposed repairs; and
Figure 7 shows a typical repair section for the repairs to the eroded section of channel.
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Figure 1, 4436 Oak Park Road 1.27.03 - Undermining of driveway to 4436 Oak Park
Road residence. Length along driveway of undermining is approximately 9 feet. Note
two gutter downspouts at 4440 Oak Park Road house that discharge toward driveway.
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? F r'? t; r, `•' -?\?f ,iV V L F; r 1° f ? 1 ?7'^'-? ?„9
Figure 2, 4436 Oak Park Road 1.27.03 - Undermining of driveway to 4436 Oak Park
Road residence. Length along driveway of undermining is approximately 9 feet.
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4436 Oak Park Road
Vegetation
Riprap with.

Filter Fabric
Underliner -
------
Left Side of Channel
(Facing Downstream)
1
3 feet
2

15 feet
Existing Ground Line
Figure 7 - Typical Repair Section
NTS
Vegetation to consist of:
Live Stakes to be planted during fall or winter. Mixture may be selected from the
following species: River Birch, Green Ash, Black Willow, Tag Alder, Silky
Dogwood, Buttonbush, Witch Hazel. 300 live stakes to be planted for this project at a
rate of one live stake for each 2.5 to 3.0 square feet of stabilized area.
Permanent Grass Vegetation to be Tall Fescue (K-31) to be planted from August 20 to
October 25. Temporary Grass Cover to be planted as follows: Rye Grain at 120
pounds per acre from January 1 to May 1 and from October 25 to December 31; and
German Millet at a rate of 40 pounds per acre from May 1 to August 20.