20030411 Ver 1_COMPLETE FILE_20030404

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Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
p `C Alan W. Klimek, P.E., Director
Division of Water Quality
May 22, 2003
City of Raleigh
Central Engineering Department
Attn: Mr. Carl R. Dawson, Jr., P.E.
PO Box 590
Raleigh, NC 27602-0590
DWQ Project No. 03-0411
County: Wake
Page 1 of 2
Subject Property: 4025 Balsam Drive, Structural Flooding Project, Raleigh, NC
UT to Crabtree Creek [03-04-02, 27-33-(10), C NSW (nutrient sensitive)]
APPROVAL of 401 Water Quality Certification and AUTHORIZATION CERTIFICATE per the Neuse River Buffer
Protection Rules (15A NCAC 2B.0233) with ADDITIONAL CONDITIONS
Dear Mr. Dawson:
You have our approval, in accordance with the attached conditions and those listed below, to place fill within or
otherwise impact 4 feet of stream and 1,116 square feet (ft) of protected riparian buffers for the purpose of constructing
the proposed structural flooding project at the subject property, as described within your application dated March 31,
2003. After reviewing your application, we have decided that the impacts are covered by the N.C. Division of Water
Quality (DWQ) General Water Quality Certification Number(s) 3376 (GC3376). The Certification(s) allows you to use
Nationwide Permit(s) 3 when issued by the US Army Corps of Engineers (USACE). This letter shall also act as your
approved Authorization Certificate for impacts to the protected riparian buffers per 15A NCAC 26.0233. In addition,
you should obtain or otherwise comply with any other required federal, state or local permits before you go ahead with
your project including (but not limited to) Erosion and Sediment Control regulations. Also, this approval will expire when
the accompanying 404 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 you may be required to 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. If
total fills for this project (now or in the future) exceed one acre of wetland or 150 linear feet of stream, 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 any additional conditions listed below.
Violations of any condition herein set forth may result in revocation of this Certification and may result in criminal and/or
civil penalties. This Certification shall become null and void unless the above conditions are made conditions of the
Federal 404 and/or coastal Area Management Act Permit. This Certification shall expire upon expiration of the 404 or
CAMA permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or stream impacts),
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.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved buffer impacts)
shall be referred in writing to the Director for a decision. The Director's decision is subject to review as provided in
Articles 3 and 4 of G.S. 150B.
North Carolina Division of Water Quality, WETLANDS / 401 UNIT
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands
Page 2 of 2
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act and the
Neuse riparian buffer protection rule as described within 15A NCAC 2B .0233. If you have any questions, please
telephone John Dorney at 919-733-9646 or Bob Zarzecki at 919-733-9726.
Sincerely,
Alan W. Klimek, P.E.,
NC DWQ, Director
Attachments: Certificate of Completion
GC 3376
Cc: USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
File Copy
Central Files
DWQ # 030411
Date: May 22, 2003
bz
MEMORANDUM
TO: John Dorney Regional Contact: Steve Mitchell
Non-Discharge Branch WO Supervisor:
Date:
SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS
Facility Name 4025 Balsam Drive County Wake
Project Number 03 0411 County2
Recvd From APP Region Raleigh
Received Date 4/4/03 Recvd By Region
Project Type construction of Berm to prevent flooding
Certificates Stream Stream Impacts (ft.)
Permit Wetland Wetland Wetland Stream Class Acres Feet
Type Type Impact Score Index Prim. Supp. Basin Req. Req. ME
NBR Buffers OO Y _0N F__ 27-33-(10) F c NSW 30,402. 0.03 4.00 F-
.....r.Y....C.. O
Mitigation Wetland
MitigationType 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? 0 Y O N Recommendation: 0 Issue 0 Issue/fond 0 Deny
Provided by Region: Latitude (ddmmss) 355020 Longitude (ddmmss) 784240
Comments:
May 1, 2003
HOLD
From the information submitted, I cannot tell where the gropsed berm is located . There is no plat
map indicating if the berm' s in or out of the buffer. If out, ISSUE. If not, we will need to do
something about the stormwater that it will collect .
cc: Regional Office
Central Office Page Number 1
Triage Check List
Date: Project Name: -LJ62-5 A PAI
t,'d--t-
DWQ#: 0.3 - Q f !
County:
To: ? ARO
? FRO
? MRO
C° RRO
From: 44, .4"t
Mike Parker ? WaRO Tom Steffens
Ken Averitte ? WiRO Noelle Lutheran
Alan Johnson ? WSRO Cyndi Karoly (Central Office)
Steve Mitchell
Telephone : (919)
The file attached is being forwarded to your for your evaluation.
Please call if you need assistance.
Z-Stream length impacted
0 Stream determination
Wetland determination and distance to blue-line surface waters on USFW topo maps
N Minimization/avoidance issues
Buffer Rules (Meuse, Tar-Pamlico, Catawba, Randleman)
? Pond fill
? Mitigation Ratios
? Ditching
? Are the stream and or wetland mitigation sites available and viable?
EL Check drawings for accuracy
? Is the application consistent with pre-application meetings?
? Cumulative impact concern
Comments:
r''±
HLE COPY
GaitrJ. Of (Raleigh
.Worth C`'arolina
April 1, 2003
Mr. John Dorney
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
4025 Balsam Drive
Raleigh, NC 27612-3605
Dear Mr. Dorney:
WETLANDS/ 401 GROUP

WATER QUALITY SECTION
Please find enclosed seven copies of a completed "Pre-Construction Notification
Application Form" for the referenced project. This project will involve the construction of
a berm in the backyard of the property at 4025 Balsam Drive in Raleigh, North Carolina
to prevent structural flooding of the basement/lower level of the house. The stream
channel located on the property is located approximately 40 to 50 feet from the house,
and thus, the berm will be in the Neuse River Buffer regulated area. The house was
constructed in 1967. 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, please contact me at telephone number (919) 890-
3818.
Sincerely,
James K. Leumas, P. E.
Stormwater Services Engineer
JKL/
Enclosures
cc: Mr. H. Daniel Bowden, P. E.
Ms. Veronica K. Erby
OFFICES • 222 WEST HARGETT STREET • POST OFFICE BOX 590 • RALEIGH. NORTH CAROLINA 27602
Recycled Paper
Pre-Construction Notification Application Form
Table of Contents
Project: 4025 Balsam Drive
Raleigh, NC 27612-3605
I. Pre-Construction Notification Application Form (Pages 5 of 14 through 14 of 14)
II. Vicinity Map (One Sheet)
III. United States Geological Survey 7.5-Minute Raleigh West Quadrangle Map,
Photorevised 1987/Photoinspected 1988 (One Sheet)
IV. Wake County Soil Survey, Issued November 1970, Map 38 (One Sheet)
V. City of Raleigh Geographic Information System Map Showing Property Location (One
Sheet)
VI. Wake County Geographic Information System Map Showing Property Location of 4025
Balsam Drive, Aerial View (one Sheet)
VII. Repair Plan, 11 x 17 (One Sheet)
VIII. Typical Berm Section (One Sheet)
IX. Stream Bank Repair Summary - 4025 Balsam Drive (Four Sheets)
X. Photos (One Sheet)
XI. HEC-1 Output File for 1-Year 24-Hour, 2-Year 24-Hour, 5-Year 24-Hour, 10-Year 24-
Hour, 25-Year 24-Hour, 50-Year 24-Hour, 100-Year, 24-Hour and 1/3 PMP 6-Hour
Storm Events (Four Sheets)
XII. Urban NC Streams Bankfull Equations (One Sheet)
XIII. Flowmaster Worksheets for Irregular Channel for Bankfull Discharge and 100-Year 24-
Hour Storm Events (Four Sheets)
Office Use Only: Form Version May 2002
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
Processing
1. Check all of the approval(s) requested for this project:
? Section 404 Permit ® Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
? 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: N/A
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 (verify availability with NCWRP prior to submittal of PCN), complete
section VIII and check here: ?
If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: City of Raleigh
Mailing Address: Central Engineering Department
Post Office Box 590
Raleigh, NC 27602-0590
Attention: Mr. Carl R. Dawson, Jr., P. E.
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: Carl.Dawson(-,ci.raleigh.nc.us
2. Agent/Consultant 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 14
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: 4025 Balsam Drive, Project to Address Structural Flooding at
2. T.I.P. Project Number or State Project Number (NCDOT Only):
N/A
3. Property Identification Number (Tax PIN): 0786.19 50 6349
4. Location
County: Wake Nearest Town: Raleigh
Subdivision name (include phase/lot number): Section 4 Laurel Hills West / Lot 97
Directions to site (include road numbers, landmarks, etc.): From downtown Raleigh, take
U. S. 70 West (Glenwood Avenue) toward Durham. Take a left turn onto Creedmoor
Road Extension (heading southwest). Take a right turn onto Laurel Hills Road
(heading west). Take a right turn onto Boxwood Road (heading west). Take a right
turn onto Balsam Drive (heading north). House is on left (west) side of street.
5. Site coordinates, if available (UTM or Lat/Long): N 78 deg 42 min 40 sec Longitude/ W 35
deg 50 min 20 sec Latitude
(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. Property size (acres): 0.47 acre
7. Nearest body of water (stream/river/sound/ocean/lake): Tributary to Crabtree Creek
8. River Basin: Neuse River Basin
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/adniin/niaps/.)
Page 6 of 14
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The existing home was built in 1967. It is on a 0.47-acre
lot. Other houses in the neighborhood are generally on 0.5-acre lots. The land use is
zoned R-4 (0.25-acre residential), but the houses are situated on the lots such that
further subdivision of the lots would not be practical. The lot slopes from east to west
and the tributary to Crabtree Creek at the rear of the property flows north toward
Crabtree Creek.
10. Describe the overall project in detail, including the type of equipment to be used: It is the
intent of this project to construct a berm 18 inches in height through the backyard,
mostly in the fenced area of the backyard, with two 4-inch diameter pipes through the
berm with backflow prevention valves to prevent flooding of the lower level of the
house. The two 4-inch diameter pipes with backflow prevention valves will allow water
that collects in the yard to escape to the creek but prevent out of bank flooding to flood
the lower level/basement of the house. Two pipes are to be installed simply for
redundancy. An existing swale on the south side of the property will be regraded to
direct flow away from the southwest corner of the house. A 12-inch high berm will be
constructed adiacent to Balsam Drive and along the north side of the property along
with modifications to the driveway to prevent flow from the street going down the
driveway and flooding the garage. A damaged 12-inch diameter reinforced concrete
pipe section, approximately 6 to 8 feet in length, that goes through the right bank of the
channel will be removed and graded as a trapezoidal opening to allow water through
the opening rather than through the damaged 12-inch diameter reinforced concrete
pipe. A rubber-tired backhoe will be used for shaping/grading activities and materials
placement; and a dump truck will be used for disposition of materials. Construction
equipment will not need to cross or get into the channel. All graded areas are to be
stabilized with vegetation. Also, sediment control measures, such as sediment traps, are
to be installed at the downstream end of grading activities for regrading the swale at the
south end of the property and oust upstream of the existing 12-inch diameter reinforced
concrete pipe to be removed.
11. Explain the purpose of the proposed work: The purpose of this project is to address
structural flooding at 4025 Balsam Drive. The house is located in a low area with the
stream channel approximately 40 to 50 feet from the house footprint. The lower
level/basement of the house and the garage have experienced flooding from Hurricane
Fran in September 1996 as well as during at least one storm event in 2002. The berm
across the backyard is intended to prevent the 100-Year storm event from flooding the
lower level/basement of the house from surface water runoff. A HEC-1 analysis and
Haestad Methods Flowmaster channel analysis to determine the 100-Year flow depth
were used to design the berm height. These analyses are included with this application.
Page 7 of 14
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
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.
1. Provide a written description of the proposed impacts: A site investigation by City of
Raleigh staff was made to determine potential impacts from this proiect. No indicators
of wetlands species were observed in the field. Sediment control measures, such as
sediment traps, are to be installed at the downstream end of Eradin2 activities for
regrading the swale at the south end of the property and iust upstream of the existing
12-inch diameter reinforced concrete pipe to be removed.
Page 8 of 14
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.fema..i?,ov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 0.0 acres
Total area of wetland impact proposed: 0.0 acres
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 Culvert 4 UT-Crabtree Creek 6.5-foot Intermittent per
Bottom width Wake County Soil
And Survey.
10-foot Perennial per
Top width USGS Quadrangle
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.usgs.?;ov. Several intemet sites also allow direct download and printing of USGS maps (e.g., www.touoz.one.com,
www.inapduest.coin, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: -4 feet
Page 9 of 14
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 construction 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 maps 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
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.
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. In particular, sediment traps will be constructed at
the downstream end of a regarded swale at the south end of the property and iust upstream
of the existing damaged 12-inch diameter reinforced concrete pipe through the high bank
of the channel which is to be removed. Following construction of the berms, the berms will
be stabilized with vegetation (seed and mulch) to restrain erosion.
Page 10 of 14
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
in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetlands/stnngide.htmi.
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
Page I 1 of 14
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.ne.us/wrp/index.htm. 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 (required by DWQ)
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 ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
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:
Page 12 of 14
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 1016 3
2 100 1.5
Total 1116
Zone 1 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 (required by DWQ)
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.
The existing lot has a deeded acreage of 0.47 acre. Of the total lot acreage, the house, deck.
garage, covered porch, sidewalk and driveway constituting the impervious areas total
approximately 0.08 acre. Thus, the existing impervious surface area is 17 percent of the
total lot acreage. The proposed improvements will not create any additional impervious
surface areas.
XII. Sewage Disposal (required by DWQ)
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 (required by DWQ)
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
Page 13 of 14
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).
v I rr.., r VU-
Applicant/Agent's Sign;
(Agent's signature is valid only i
3
authorization letter from the applicant is provided.)
Page 14 of 14
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4025 Balsam Dr
Raleigh NC
27612-3605 US
Notes:
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4025 Balsam Drive
Typical Berm Section
2H:1 V Side Slopes
Top Width = 2 feet
Berm - 12 inch or 18 inch
height. See Plan View
EXISTING
GROUND LINE
Typical Berm Section
NTS
Berms and other disturbed areas to be seeded with Permanent Grass Vegetation.
Permanent Grass Vegetation to be Tall Fescue (K-31) to be planted from August 20 to
October 25 at a rate of 120 pounds per acre.
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.
Project Repair Summary - 4025 Balsam Drive
INTRODUCTION
This narrative supplements the Pre-Construction Notification Application for the
referenced project. The City of Raleigh is submitting this repair request on behalf
of Ms. Denise A. Knight, the owner of the property at 4025 Balsam Drive. Ms.
Knight has requested assistance from the City of Raleigh through the City Storm
Drainage Policy [Resolution (1998)-833], a cost-share program that provides
financial and technical assistance in alleviating severe erosion, structural flooding
and/or public nuisances. 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 lower level of the house/basement has experienced
flooding during Hurricane Fran in 1996 and subsequently during at least one
storm event in 2002.
The purpose of this project is to address structural flooding at 4025 Balsam
Drive. The house is located in a low area with the stream channel approximately
40 to 50 feet from the house footprint. The lower level/basement of the house
and the garage have experienced flooding from Hurricane Fran in September
1996 as well as during at least one storm event in 2002. The berm across the
backyard is intended to prevent the 100-Year storm event from flooding the lower
level/basement of the house from surface water runoff. A HEC-1 analysis and
Haestad Methods Flowmaster channel analysis to determine the 100-Year flow
depth were used to design the berm height. These analyses are included with
this application.
Project Repair Summary
4025 Balsam Drive
Page Two
Work for the project consists of the following:
• Construct a berm 18 inches in height through the backyard, mostly in the
fenced area of the backyard, with two 4-inch diameter pipes through the
berm with backflow prevention valves to prevent flooding of the lower level
of the house. The two 4-inch diameter pipes with backflow prevention
valves will allow water that collects in the yard to escape to the creek but
prevent out of bank flooding to flood the lower level/basement of the
house. Two pipes are to be installed simply for redundancy. The berm
will have a top width of 2 feet and 2H:1 V side slopes (or flatter).
• An existing swale on the south side of the property will be regraded to
direct flow away from the southwest corner of the house.
• A 12-inch high berm will be constructed adjacent to Balsam Drive and
along the north side of the property along with modifications to the
driveway to prevent flow from the street going down the driveway and
flooding the garage. The berm will have a top width of 2 feet and 2H:1 V
side slopes (or flatter).
• A damaged 12-inch diameter reinforced concrete pipe section,
approximately 6 to 8 feet in length, that goes through the right bank of the
channel will be removed and graded as a trapezoidal opening to allow
water through the opening rather than through the damaged 12-inch
diameter reinforced concrete pipe.
A rubber-tired backhoe will be used for shaping/grading activities and materials
placement; and a dump truck will be used for disposition of materials.
Construction equipment will not need to cross or get into the channel. All graded
areas are to be stabilized with vegetation. Also, sediment control measures,
such as sediment traps, are to be installed at the downstream end of grading
activities for regrading the swale at the south end of the property and just
upstream of the existing 12-inch diameter reinforced concrete pipe to be
removed.
Digital photographs are enclosed with the application showing the existing
conditions of the site with descriptions of work to be performed.
Project Repair Summary
4025 Balsam Drive
Page Three
The USGS 7.5-Minute Raleigh West Quadrangle map shows the project location
to be on a blue line perennial stream. The Wake County Soil Survey, however,
indicates the site location to be on an intermittent stream. The drainage area of
the channel is approximately 241.5 acres at the location of 4025 Balsam Drive.
ENGINEERING ANALYSES
HEC-1 analysis was performed for the watershed of the creek to the project site.
Discharges determined from the HEC-1 analyses are as follows:
1-Year 24-Hour Storm Event - 145 cfs
2-Year 24-Hour Storm Event - 171 cfs
100-Year 24-Hour Storm Event - 695 cfs
Using the Urban North Carolina Streams Bankfull Equations, the Bankfull
discharge is calculated to be 166 cfs. This compares favorably with the HEC-1
analyses. The 100-Year 24-Hour storm event peak water surface with the
proposed berm in place is estimated to be at Elevation 95.7 with the top of berm
at elevation 96.3, thus giving 0.5 foot of freeboard during the 100-Year 24-Hour
storm event.
CONSIDERATION OF ALTERNATIVES
Alternatives that have been considered for the site include the following:
• Constructing a concrete masonry unit (CMU) or brick wall across the
backyard. This alternative was not selected because there was no additional
benefit from constructing a CMU or brick wall than constructing a vegetated
berm. It is preferred to not use hardened structures in the 50-foot Neuse
River buffer.
• "Do Nothing". This approach would allow out of channel bank flow to
continue to flood the lower level/basement of the house at 4025 Balsam
Drive. The house on this property was constructed in 1967, prior to passage
of the Neuse River Buffer Rules.
Project Repair Summary
4025 Balsam Drive
Page Four
It is felt that the selected design will best address the structural flooding channel
erosion and provide a sound repair that will enhance water quality within the
Neuse River Basin. It is the intent of the design to maximize the use of turf
reinforcing matting, grass vegetation and live stakes, except at the outlet of the
24-inch diameter reinforced concrete pipe flared end section where high
discharge velocities require the use of a riprap energy dissipator to protect the
channel.
It should be noted that this project is not in conjunction with new development of
property, but to correct an existing structural flooding problem. Thus, a finding of
"No Practical Alternatives" appears to be warranted for the use. Best
management practices (BMPs) will be used for this project. (Reference North
Carolina Administrative Code, Title 15A, Subchapter 213, Section .0233(6) [15A
NCAC 2B .0233(6)] and 15A NCAC 2B .0233(8)(a).) The intent of this project is
to provide protection to an existing house in a manner that will minimize land
disturbance to the riparian buffer, preserve aquatic habitat, and protect water
quality within the Neuse River Basin. BMPs to control the impacts associated
with construction activities include using erosion and sediment control measures
as outlined in the North Carolina "Erosion and Sediment Control Planning and
Design Manual."
--000--

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Photo 1 - Balsam Drive, 4/17/02
Backyard of house. Photo taken facing southeast. Drainage channel is not visible, but
is to the right of the photo. There is a swale running from the lower level back door
toward the low point of the chain-link fence. The flow then follows the swale to a
concrete pipe (only two short sections) approximately 12 inches in diameter or smaller
where it discharges into the tributary to Crabtree Creek.
Existing 12-inch
diameter reinforced
concrete pipe
Sediment Deposition just upstream from concrete pipe that discharges into drainage
channel. Photo taken facing west.
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Project: 4025 Balsam Drive
Name: JKL
Date: 3.27.03
Urban NC Streams - Bankfull Equations
Drainage Area, Acres = 241.50
Drainage Area, square miles = 0.38
Drainage Area, square kilometers = 0.98
Bankfull Cross Sectional Area, square feet = 32.02 r2=0.95
Bankfull Discharge, cfs = 166.03 r2=0.94
Bankfull Width, feet = 17.68 r2=0.88
Bankfull Mean Depth, feet = 1.76 r2=0.87
Worksheet
Worksheet for Irregular Channel
Project Description
Worksheet 4025 Balsam Drive - 100-Year St
Flow Element Irregular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Slope 030000 ft/ft
Discharg 695.00 cfs
Options
Current Roughness Methc rved Lotter's Method
Open Channel Weighting wed Lotter's Method
Closed Channel Weighting Horton's Method
Results
Mannings Coefficiei 0.041
Water Surface Elev 95.71 ft
Elevation Range .65 to 97.60
Flow Area 80.0 ft2
Wetted Perimeter 48.73 ft
Top Width 46.90 ft
Actual Depth 4.06 ft
Critical Elevation 95.93 ft
Critical Slope 0.021270 ft/ft
Velocity 8.69 ft/s
Velocity Head 1.17 ft
Specific Energy 96.88 ft
Froude Number 1.17
Flow Type Supercritical
Roughness Segments
Start End Mannings
Station Station Coefficient
0+00 0+35 0.035
0+35 0+45 0.060
0+45 0+66 0.035
Natural Channel Points
Station Elevation
(ft) (ft)
0+00 97.60
0+19 95.60
0+35 93.60
0+37 91.80
0+40 91.65
0+44 92.50
0+45 93.80
0+63 94.70
0+66 96.30
Title: 4025 Balsam Drive Project Engineer: James K. Leumas, P. E.
untitled.fm2 City of Raleigh FlowMaster v6.0 [614b]
03/27/03 01:12:07 PM © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1
Cross Section
Cross Section for Irregular Channel
Project Description
Worksheet 4025 Balsam Drive - 100-Year St
Flow Element Irregular Channel
Method Manning's Formula
Solve For Channel Depth

Section Data
Mannings Coefficiei 0.041
Slope 0.030000 ft/ft
Water Surface Elev 95.71 ft
Elevation Range .65 to 97.60
Discharge 695.00 cfs
?1 P--f
53?,?m
98.00,
95.50
93.50!
91.50
0+00 0+10 0+20 0+30 0+40 0+50 0+60 0+70
V:1
H:1
NTS
Title: 4025 Balsam Drive Project Engineer: James K. Leumas, P. E.
untitled.fm2 City of Raleigh FlowMaster v6.0 [614b]
03/27103 01:12:31 PM © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1
4025 Balsam Drive - Urban Bankfull Discharge
Worksheet for Irregular Channel
Project Description
Worksheet 4025 Balsam Drive - Urban Bankfull
Flow Element Irregular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Slope 030000 ft/ft
Discharg 166.00 cfs
Options
Current Roughness Methc rved Lotter's Method
Open Channel Weighting wed Lotter's Method
Closed Channel Weighting Horton's Method
Results
Mannings Coefficiei 0.041
Water Surface Elev 94.39 ft
Elevation Range .65 to 97.60
Flow Area 27.9 ft'
Wetted Perimeter 29.63 ft
Top Width 28.14 ft
Actual Depth 2.74 ft
Critical Elevation 94.44 ft
Critical Slope 0.026853 ft/ft
Velocity 5.96 ft/s
Velocity Head 0.55 ft
Specific Energy 94.94 ft
Froude Number 1.05
Flow Type Supercritical
Roughness Segments
Start End Mannings
Station Station Coefficient
0+00 0+35 0.035
0+35 0+45 0.060
0+45 0+66 0.035
Natural Channel Points
Station Elevation
(ft) (ft)
0+00 97.60
0+19 95.60
0+35 93.60
0+37 91.80
0+40 91.65
0+44 92.50
0+45 93.80
0+63 94.70
0+66 96.30
Title: 4025 Balsam Drive Project Engineer: James K. Leumas, P. E.
c:1...4025 balsam drive 100-year storm channel.fm2 City of Raleigh FlowMaster v6.0 [614b]
03/27/03 03:44:54 PM © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1
Urban Bankfull Discharge
Cross Section for Irregular Channel
Project Description
Worksheet 4025 Balsam Drive - Urban Bankfull
Flow Element Irregular Channel
Method Manning's Formula
Solve For Channel Depth
Section Data
Mannings Coefficiei 0.041
Slope 0.030000 ft/ft
Water Surface Elev 94.39 ft
Elevation Range .65 to 97.60
Discharge 166.00 cfs
98.00,E
95.50
93.50
91 .50
0+00
0+10 0+20 0+30 0+40
0+50
0+60 0+70
V:1 L
H:1
NTS
Title: 4025 Balsam Drive Project Engineer: James K. Leumas, P. E.
c:\...4025 balsam drive 100-year storm channel.fm2 City of Raleigh FlowMaster v6.0 [614b]
03/27/03 03:45:12 PM © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA [phone] Page 1 of 1
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4025 Balsam Drive
Typical Berm Section
2H:1 V Side Slopes
Top Width = 2 feet
Berm - 12 inch or 18 inch
height. See Plan View
------ --------------------- -------------------
EXISTING
GROUND LINE
Typical Berm Section
NTS
Berms and other disturbed areas to be seeded with Permanent Grass Vegetation.
Permanent Grass Vegetation to be Tall Fescue (K-31) to be planted from August 20 to
October 25 at a rate of 120 pounds per acre.
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.