20110910 Ver 1_Application_20111010

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STATE OF NORTH CAROLINA ��sr'�A, >>
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DEPAR'TMENT OF TRANSPORTATION qTF��
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BEVERLY EAVES PERDUE EUGENE A. CO�R7,JR.
. Goveiwox � � Sscneraxr
. October 6,2011 - �
Ms. Amy Euliss y y 0 � � Q
NC DENR Division of Water Qnality 1 1
585 Waughtown SVeet
Winston-Salem,NC 27107
Mr. Andrew Williams
US Army Corps of Engineers
6508 Falls of the Neuse Suite 120
Raleigh, NC 27615-6814
(Two Copies)
Subject: Orange County, A7alea Drive Chapel Hill
Project Number# 7C. 206811
To Whom It May Cancern:
The North Cazolina Department of Transportation (NCDOT) proposes to replace an undersized culvert,
repair an eroded bank and place riprap in the stream to improve severely perched downstream end of an
exiating culvert in Orange County. The proposed work is necessary in order to stop severe scouru�g at the
end of the culvert and to bring the aite up to NCDOT standards. This activity will result in permanent
impacts to an UT of Motgan Creek. The NCDOT anticipates that the activity will be authorized under
Nationwide Permit (NWP) 14. This application is intended as a request for written authorization from the
US Army Corps of Engineers for the Nationwide 14. This package is also being forwazded to the NC
Division of Water Quality for authorization as prescribed under General Water Quality Certification 3820.
Although the project falls cvithin the Jordan Lake watershed, all work involvu�g buffered azea is proposed to
be within the existing transportation facility. Also. the unnamed tributary at the site doea not appeaz on the
topo maps nor the soil aurvey. The following information is being provided to satisfy conditions of the
Nationwide Permit and General Water Quality Certification.
P.O. Box 14996 Greensboro, NC 27415-4996 Telephone No. [phone] Faac No. [phone] -

PROJECT INFORMATION
Road Name Stream Project Length Classification
miles
Azalea Drive UT to Mor an Crcek N/A Subdivision
River Basin: DID� De`s r�von %Impervious Surface
Cape Fear 16-41-2-(5.5) WS-IV;NSW N/A
Buffer Rules°� Buffer Rule Condidons(where appficable)
Yes Jordan Lake Buffer
Protec[ed Species Presentb M3pped HiStoric CAMA Essential Fishery Habitat
Pro erties ��
No No No No
a Separate doaunentation attached as nceded: See[he attached Endangered Species Review Sheet for further information: `When
Applicable-See the attached Historic Review Letter for further information
CULVERT REPAIR
Site Station NIA Straam T Perennial
Existing Stream 4-6 feet Proposed 5-8 feel
�dth Stream Width
Construction Replace undersized culvert(2@ 8(Ht X 36 Dewatering NIA
Method inch)with new culvert(2�80 ft X 48 inch), Device'
repair eroded bank and line e�tis6ng
blowhole(not filq with Class II riprap in
sVeam to alleviate scouring fmm severety
perched culvert. No aquipment is proposed
to be in the stream.
Burial Depth N/A E/C Plan NIA
Date
ConsWcfion As soon as pracficable Duration One week
Date
I cts ft. roximatel 10 linear feet of rmanent sVeam im acts and 10 ft of te ra i cts.
Special
Conditions -
Restorafion Plan Wthin 15 working days of the project completion any disturbed area adjacent to the stream will be
restored and seeded.
RCP=reiMorced concrete pipe; CMP=Cortugated metal pipe;CMPA= Cortugated metal pipe arch; E/C=Eroaon control. 'A less inWsive
dewatering device may be used in lieu of fhe one proposed.

MINIMIZATION INFORMATION
Impacts will be miaimized by strlct eaforcemeat of Best Meaegemeat Practices for the protectioa ot
surface watsxs and wetlands, restrictions egaiast the stagiag of equipmeat ia or adjacent to wate:s of
the U8, and coordinatioa �iaclndiag a pra-coastraction meetiag)with the Division Euvimnmantsl
OfQcer.
MITIGATION INFORMATION
Stream mitigatioa is aot aaticipated, as the impacts to eay individnal stream do aot excead 1S0 feat
Wetlead mitigetion is uot anticipated, as wetlaad lmpacts do aot exceed 0.10 acres and do not occur
in a uuiqne natural wetlead.
APPLICATION INFORMATION
Eacloaed pleaae 9nd the Pre-coastractioa NotiScation Form aad sapporting docnmeatatioa for the
alwve refereaced prnj�t. If yon havo eny qnestioas or need eay additional iaformetioa, please
coatact Jerry Perker at �336) 236-2063. Yonr time and effort ere appraclated.
Sincerely,
� � . � 1��
.J.M. Mills, P.E.
Division Engineer,Division 7
Enclosures
CC: Chuck Edwazds,NCDOT
- B. John Howell, NCDOT
Barry Harringtoq NCDOT
NC DENR DWQ We[lands/401 unit(Six copies)

=oF wATF90 OTfice Use Only:
° � Corps action ID no.
� ��� i o -�c DWQ project no.
Form Version 1.3 Dec 1D 20D8
Pre-Construction Notificafion PCN Form
A. A licant Information
1. Processing
1 a. Type(s)of approval sought from the
� Section 404 Permit ❑ Section t0 Permit
Corps:
1 b. SpeciTy Nationwide Permit(NWP)number: 14 or General Permit(GP)number:
tc. Has the NWP or GP number been verified by the Corps? ❑ Yes � No
1 d. Type(s)of approval sougM from the DWQ(check all that apply):
� 401 Water Qual'ity Cerfification—Regular ❑ Non-404 Jurisdictional General Permit
❑ 401 Water Quality Certification—E�ress ❑ Riparian Buffer Authorization
1 e. Is this notification solely for the record For the record only for DWQ 401 For the record anly for Corps Permit:
because written approval is not required? Certification:
, ❑Yes � No ❑Yes � No
1f. Is payment into a mitigation bank or in-lieu fee program proposed for mi�gation �Yes � No
of impacts7 If so, attach the acceptance letter from mfigation bank or in-lieu
fee program.
1 g. is the project located in any of NCs twenty coastal counties, If yes, answer 1 h . ❑ Yes � No
below.
1 h. Is the project located within a NC DCM Area ofEnvironmental Concem (AEC)? ❑Yes � No
2. Project Infortnation
2a. Name of project: Azalea Drive (SR 1210)
2b. County: Orange
2c. Nearest municipality/town: Chapel Hill
2d. Subdivision name: N/A
2e. NCDOT onty,T.I.P. or state WgS 7C.206811
project no:
3. Owner Infortnation
3a. Name(s)on Recorded Deed:
3b. Deed Book and Page No.
3c. Responsibfe Party(for LLC if
applicable):
3d. Street address:
3e. City, stete, zip:
3f. Telephone no.:
3g. Fax no.:
3h. Email address:
Page 1 of 11
PCN Fortn—Version 1.3 December 10, 2008 Version

4. Appliwnt Information(if d"rfferent from owner)
4a. Applicant is: �Agent ❑ Other, specify:
4b. Name: J. M. Mills
4c. Business name Division Engineer NCDOT Division Seven
(if applicable):
4d. Street address: P.O. Box 14996
4e. City, state,zip: Greensboro, NC 27415
4f. Telephone no.: 336 334-3297
_ 4g. Fax no.: .
4h. Email address:
5. Age�rt/Consultant IMortnation(if applicable)
5a. Name: Jerry Parker
5b. Business name Division Environmental Supervisor
(if applicable):
5c. Street address: P.O. Box 14996
5d. City, state,zip: Greensboro, NC 27415
5e. Telephone no.: 336 256-2063
5f. Fax no.:
5g. Email address:
Page 2 of 11
PCN Fortn—Version 1.3 December 10, 2008 Version

B. Project InformaUon and Prior Project History
1. Property IdeMiFcation
ta. Property identification no. (tax PIN or parcel ID): N/A
Latitude: 35.8895945 N Long'itude: -
1 b. SRe coordinates(in decimal degrees): 79.05331�B W
� � (DD.DDDD�D) (-DD.DDDDDD)
1 c. Property size: N/A acres
2. Surface Waters
2a. Name of nearest body of water(stream, river, etc.)to UT to Morgan Creek
praposed project:
2b. Water Quality Classfication of nearest receiving water: WSIV; NSW
2c. River basin: Cape Fear
3. Project Description
3a. Describe the existing condfions on the site and the general land use in the viciniry of the project at the time of this
application:
Residential subdivision
3b. List the total estimated acreage of all existing wetlands on ihe property:
0
3c. List the total estimated linear feet of all existing streams(intermitterrt and perennial)on Uie property:
N/A
3d. Explain the purpose of the proposed project:
Replace undersized culvert, repair eroded bank at downstream end of culvert and line existing blowhole in stream with
Class II riprap to act as a dissipation pad for severety perched culvert. It is recommended that the inlet end of the pipe is
not buried (See attached letter from Hydraulics Manager)
3e. Describe the overall project in detail, includi�g the type of equipment to be used:.
The site will be de-watered,riprap will be placed along eroded downstream bank and then riprap will be used to line
stream bed in existing blowhole. Backhoe,trackhoe and excavator will be utilized during the project. No equipmeM is
praposed to be in the stream.
4. Jurisdictional Determinations
4a. Have jurisdiclional wetland or stream determinations by the
Corps or SWte been requested or obtained for this property!
projec[(including ali prior phases) in the past? ❑ Yes � No ❑ Unknown
Comments:
4b. If Uie Corps made the jurisdictional determination,what type
of determination was made? ❑ Preliminary � Final
4c. If yes,who delineated the jurisdictional areas? Agency/Consultant Company:
Name (if known): Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
Sa. Have permits or certifications been requested or obtained for �Yes � No ❑ Unknown
this project(including all prior phases) in the past?
5b. If yes, e�lain in detail according to "help file"instructions.
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PCN Fortn—Version 1.3 December 10, 2008 Version

6. Future Project Plans
6a. Is this a phased project? ❑ Yes � No
6b. If yes, explain.
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PCN Fortn—Version 1.3 December 10, 2008 Version

C. Proposed Impacts Inverrtory
1. Impacts Summary
1 a. Which sections were completed below for your project(check all that apply):
❑Wetlands � Streams-tributaries ❑ Bufiers
❑ Open Waters ❑ Pond Construction
2. Wetland Impacts �
If ihere are wetland impacts proposed on the si[e,then complete tfiis question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number— Type of impact Type of weUand Forested (Corps-404, 10 Area of impact
PermaneM(P) or (if known) DWQ—non-404, other) (acres)
Tem ora
W7 ❑ P ❑T ❑ Yes ❑ Corps
❑ No ❑ DWQ
� ❑ P ❑ T ❑ Yes ❑ Corps
❑ No ❑ DWQ
W3 ❑ P ❑ T ❑ Yes ❑ Corps
❑ No ❑ DWQ
W4 � P 0 T ❑�'es ❑ Corps
❑ No ❑ DWQ
W5 ❑ P 0 T ❑ Yes ❑ Corps
❑ No ❑ DWQ
W6 ❑ P ❑ T ❑ Yes ❑ Corps
� No ❑ DWQ
2g. Total wetland impacts
2h.CommeMs:
3. Stream Impacts
If ihere are perennial or intermitterrt stream impacts(including temporary impacts)praposed on the site,then complete tfiis
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3g.
Stream impact Type of impact Stream name Perennial Type of jurisdiction Average Impad
number- (PER) or (Corps-404, 10 stream length
Permanent(P)or i�termittent DWQ—non�04, Width (linear
Temporary(� ��N�� other) (feet) feet)
Riprap in stream UT to Morgan � PER � Corps
S1 � P �T to serve as Creek ❑ INT � DWQ 4�ft 10 feet
dissipator pad
Sandbags or UT to Morgan � PER � Corps
S2 ❑ P �T riprap for Creek ❑ INT � DWQ 4-6 ft 10 feet
dewatering
S3 ❑ P ❑ T ❑ PER ❑ Carps
❑ INT ❑ DWQ
� � P � T ❑ PER ❑ Corps
❑ INT ❑ DWQ
S5 ❑ P ❑ T ❑ PER ❑ Corps
❑ INT ❑ DWQ
S6 ❑ P � T ❑ PER ❑ Corps
❑ INT ❑ DWQ
3h. Total stream and tributary impacts 20 feet
3i. Commerrts:
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PCN Fortn—Version 1.3 December 10, 2008 Version

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 individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number— ('rf applicable) Type of impact Waterbody type Area of impact(acres)
PermaneM(P)or
Tem ora
01 ❑ P❑ T
02 ❑ P� T
03 ❑ P❑ T
04 ❑ P� T
4f.Total open water impaMs
4g. Commertts:
5. Pom1 or Lake Construcfion
If ond or lake construction ro osed,then com lete the chart below.
5a. Sb. 5c. 5d. Se.
WeUand Impacls(acres) Stream Impacts(feet) Upiand
Pond ID Proposed use or purpose (acres)
number of pond
Flooded Filled Excavated Flooded Filled F�ccavated Flooded
P1
P2
Sf.Total
5g. Comments:
Sh. Is a dam high hazard permit required?
❑Yes ❑ No If yes, permit ID no:
5i. E�ected pond surtace area (acres):
Sj. Size of pand watershed(acres):
Sk. Metliod 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 im acts re uire mfi ation,then ou MUST fill out Section D of this form.
6a.
❑ Neuse ❑Tar-Pamlico � Other:Jordan
Project is in which protected basin? ❑ Catawba ❑ Randleman
6b. 6c. 6d. 6e: 6f. 6g.
Buffer impact
number— Reason Buffer Zone 1 impact Zone 2 impact
Permanent(P) or for Stream name mitigation (square feet) (square feet)
Tem ora im act re uired?
Bt ❑ P � T ❑ Yes
❑ No
B2 ❑ P �T ❑ Yes .
❑ No
B3 ❑ P �T ❑ Yes
❑ No
6h Total buffer impacts
6i.CommeMs: Project site does not appear as a stream on the topo map nor the soil survey
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PCN Form—Version 1.3 December 10, 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.
ib. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
r
2. Compensatory Mitigation for Impacts to Waters of the U.S.or Waters of the State
2a. Does ihe project require Compensatory Mfigation for ❑Yes � No
impacts to Waters of the U.S. or Waters of the State?
26. If yes,mitigation is cequired by(check all that apply): ❑ DWQ ❑ Corps
❑ Mitigation bank
2c. If yes,which mitigation op6on will be used for tliis
project? ❑ Payment to in-lieu fee program
❑ Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of MiGgation Bank:
3b. Credits Purchased (attach receipt and letter) Type Quarrtity
3a Comments:
4. Complete'rf Making a Paymentto In-lieu Fee Program
4a.Approval letter from in-lieu fee progrem is attached. ❑Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: ❑warm ❑ cool ❑cold
4d. Buffer mitigation requested(DWQ onty): square feet
4e. Riparian wetland miGgation requested: acres
4f. Non-riparian wetland mfigation requested: aaes
4g. Coastal(tidal)wetland mitigation requested: aaes
4h. Commerrts:
5. Complete if Using a Permittee Responsible Mkigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
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PCN Fortn—Version 1.3 December 10, 2008 Version

6. Bufler Mitigation (State Regulated Riparian Buffer Rules)—required by DWQ
6a.Will the project result in an impact within a protected riparian buffer that requires ❑ Yes � No
buffer mitigation?
6b. If yes,then identity the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amourrt of mitigation required.
6c. 6d. 6e.
Zone Reason for impact Total impact MuRiplier Required mitigation
(square feet) (square feet)
Zone 1 3(2 for Catawba)
Zone 2 1.5
6f.Total buifer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparien buffer restoration, payment iMo an approved in-lieu fee fund).
6h. Comments:
�-+,..
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PCN Fortn—Version 1.3 December 10, 2008 Version

E. Stortnwater Management and Diffuse Fbw Plan(required by DWQ)
1. Diffuse Flow Plan
i a. Does the project include or is it adjacent to protected riparian buffers identified � Yes � No
wilhin one of the NC Riparian Buffer Protecfion Rules?
1 b. If yes,then is a difiuse flow plan i�duded? If no, euplain why.
❑ Yes � No
Commerds:
2. Stormwater Mana ement Plan
2a. What is the overell percent imperviousness of this project? N/A%
2b. Does this projed require a Stormwater ManagemeM Plan? ❑ Yes � No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why: No increased permanent impervious
coverage is anticipated. Therefore,stormwater flow will not increase.
2d. If this project DOES require a Stormwater Managemerrt Plan, then provide a brief, narzative description of the plan:
❑ Certified Local Government
2e. Who will be responsible for the review of the Stormwa[er Management Plan? � DWQ Stormwater Program
❑ DWQ 401 Unit
3. Certified Local GovemmeM Stormwater Review
3a. In which local governmenYs jurisdiction is this project? N/A
❑ Phase II
- 3b. Which of the following locally-implemented stormwater management programs � N� '
apply(check all that appy): ❑ USMP
❑Water Supply Watershed
❑ Other:
3c. Has the approved Stormwater Management Plan with proof of approval been ❑Yes � No
attached?
4. DWQ Stortnwater P ram Review
❑ Coastal counties
❑ HQW
4a. Which.of the following s[ate-implemented stormwater managemeM programs apply � p�yy
(check all that apply): ❑ Session Law 2006-246
❑ Other:
4b. Has the approved Stormwater Managemerit Plan with proof of approval been
attached? ❑ Yes � No
5. DWQ 401 Unit Stortnwater Review
5a. Does the Stormwater Management Plan meet fhe appropriate requirements? ❑ Yes'' ❑ No
Sb. Have ali of the 401 Unit submikal requirements been met? �Yes ❑ No
Page 9 of 11
PCN Fortn—Version 1.3 December 10, 2008 Version

F. Supplementary Infortnation
1. Environmerrtal Documentation(DWQ RequiremeM)
i a. Does the project invoive an expenditure of public(federal/state/local)funds or the � yes ❑ No
use of public(federallstate) land?
1 b. If you answered`�es"to the above, does the project require preparation of an
environmental document pursuant to the requiremenLs of the National or State ❑ Yes � No
(North Carolina) Environmental Policy Ad(NEPAISEPA)?
1 c. If you answered'�es"to the above, has the documeM review been finalized by the
State Clearing House? (If so, attach a copy of ttie NEPA or SEPA final approval
letter.) ❑ Yes ❑ No
Comments:
2. Violations (DWQ Requireme�t)
2a. Is the site in violation of DWQ Wetland Rules(15A NCAC 2H .0500), Isolated
Wetland Rules(15A NCAC 2H .1300),DWQ Surtace Water or Wetland.Standards, ❑ Yes � No
or Riparian Buffer Rules (15A NCAC 28 .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 tlie violation(s):
3. Cumulative Impacts(DWQRequiremeM�
3a. Will this project(based on past and reasonably anticipated firture impacfs)resutt in �Yes � No
additional developmeM,which could impad nearby downstream water quality?
3b. If you answered"yes"to the above, submit a qual'Rative 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 ul�mate treatrneM methods and disposition (non-discharge ar discharge)of wastewater generated from
tlie proposed project, or avaitable capaciry of the subject facility.
NA
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PCN Fortn—Version 1.3 December 10, 2008 Version

5. Endangered Species and Designated Critical Habitat(Corps RequiremeM)
5a. Will this project occur in or near an area with federaliy protected species or �yes � No
habitat?'
5b. Have you checked with the USFWS conceming Endangered Species Act �Yes � No
impacis?
❑ Raleigh
Sc. If yes, indicate the USFWS Field Office you have contacted.
❑ Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
US Fish and Wildlife Web Site
6. Esse�ial Fish HabiFat(Corps Requirement)
6a.Will this project occur in or near an area designated as essential fish habitat? ❑ Yes � No
6b. What data sources did you �e to determine whether your sfte would impact Essential Fish Habihat?
N/A
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 cuttural preservation � Yes � No
status(e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
National Historic Register Web SAe
8.Flood Zone Designatian(Corps Requireme�rt)
8a.Will this project occur in a FEMA-designated 100-year floodplain? ❑ Yes � No
8b. If yes,explain how project meets FEMA requiremeMs:
8c.What source(s) did you use to make the floodplain determination? NC Floodplain Mapping Information System
J.M. Mills n � '�. ,n nn _ I ��� 10-6-11
r�'/ � �'�C,r.�U (
ApplicanUAgenYs Printed Name � App���nUAgenYs Signature Date
(AgeM's signature is valid only if an authorization letter from the applicant
is rovided.
Page I 1 of 11
PCN Form—Version 1.3 December 10, 2008 Version

, N.C. D.O.T.
DISTRICT OFFICE
EROSION CONTROL SEQUENCE
ORANGE CO. 336 570 6833
SR 2010
AZALIA DRIVE
PIPE No. N/A
PROJECT
No.
7C.206811
DESCRIPTION: REMOVAL OF EXISTING PIPE STRUCTURE 2-80' LONG 36" RCP 8 REPLACE WITH
2-80' LONG 48" RCR
1 INSTALL A ROCK SILT DAM DOWNSTREAM THE WORK AREA TO PREVENT
INCIDENTAL SEDIMENT LOSS. '
2 INSTALL ABC AGGREGATE OR A LESS INTRUSIVE DEWATERING DEVICE TO
ALLOW DEWATERING OF THE WORK AREA.
3 INSTALL PUMPS TO DIVERT FLOW AROUND THE WORK AREA.
4 REPLACE 2 EXISTING LINES OF 80' OF 36" RC PIPE.
5 USE EXISTING CHANNEL, PLACE BASE STONE, AND
REPLACE DOUBLE 80' OF 36" RCP WITH DOUBLE 80' OF 48" RCP.
6 BACKFILL THE NEW LINE OF PIPE AND PLACE RIP RAP ONLY AS NEEDED.
7 STARTING FROM THE DOWNWARD END, REMOVE THE DEWATERING
STRUCTURE, AND RESTORE THE NATURAL STREAM CONTOURS.
8 NOTIFY LANDSCAPE DEPARTMENT FOR FINAL SEEDING.
. 9 SILT FENCES TO BE PLACED AS SITE CONDITIONS REQUIRE.
10 A 10'X15' DIRT BAG WILL BE USED TO REMOVE EXCESS WATER IN THE HOLE
WHERE THE NEW PIPE IS BEING REPLACED.
11 SITE CONDITIONS AND WEATHER MAY ALTER THESE PLANS.
12 A METHOD LESS INTRUSIVE THAN A PUMP AROUND SYSTEM MAY BE UTILIZED
IF SITE CONDITIONS ALLOW.
APPROXIMATE PROJECT START DATE October, 2012
PREPARED BY D,K. WAGONER TRANSPORTATION TECH. V DATE 9/23/2011
kwagoner

, September 23,20l!
Si[e A
Construc[ion Sequence m:d Erosion Contro(Plan for Replucement of Pipe Using a Pump Around-Orange Counry
ORANGE CO.
SR 2012
AZALIA DRIVE
PIPE No.
N/A 1 tnstalll a rock silt dam downstream of the work area to prevent incidental sediment loss.
2 Install ABC aggregate or a less intrusive dewatering device to allow dewatering of the
work area.
3 Install pumps to divert flow around the work area.
4 Replace double 80'-36" RCP with double 80'-48" RCP
5 Use existing channel, place base stone, and replace double 80'-36" RCP
with double 80'-48" RCP.
6 Backfill the new line of pipe and place rip rap only as needed.
7 Starting from the downward end, remove the dewatering structure and restore the natural
sream contours.
� SR 2010
�
; 20, �
� ASPHALT ��
60' �
' � 10'X1S
� � DIRT BAG
� ;
' �
Pipe 1
� LOW AREA
�
SANBAGS �
�
� �
�
' SR 2010 rn sandbags
�
"�J
; �
� � �y� �� � �riprep
' ; v b
;' � o O�
,
, "� , ',;trees
SR 1008
kwagoner

ORANGE CO.
SR 2010
8 Notify landscape department for final seeding.
9 Silt fences to be placed as site conditons require.
10 A 10'X15' dirt bag will be used to remove excess water in the hole where new pipe
PIPE No. is being replaced.
N/A 11 Site conditions and weather may alter these plans.
12 A method less intrusive than a pump around system may be utilized if site conditions
allow.
�
�
�
� SR 2010 �
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SR 1008
60' R/W
kwagoner '

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STATE OF NORTH CAROLINA
DEPARTMENT OF TRANSPORTATION
� BEVERLY EAVES PERDUE ' EUGEN£A.CONTI,JR.
GOVERNOR � SECRETARY
August 19, 2011
COiTNTY: Orange
MEMORANDUM TO: Mr. C.N. Edwazds, Jr., PE
Dishict Engineer
FROM: J. L. Lindsey, PEo��
Hydraulics Manager f azntenance Studies
SUBJECT: Sufficiency of Existing 2-36"RCP
SR 2010 (Azalea Drive)
As you requested by letter ofJuly 21,2011, a review of subject site has been made and
the following is the result.
During the on-site review it was found that 2@ 36"RCP provides conveyance of surface
stormwater runoff beneath SR 2010. The inlet was in good shape with about 3' of cover
over the pipe. There was an estimated 10' diameter blowhole at the outlet. The outlet end
of the pipes aze perched about 2' above the bed. The outlet channel is deeply entrenched.
There is a narrow band of rock outcrop at the pipe outlet and a wider band of rock
outcrop about 50' downstream. Tlus rock outcropping is serving as a natural barrier that
impedes headcutting that was noted downstream.
It has been determined that the drainage azea to this site is approximately 90 acres.
Hydrologic and hydraulic analysis indicates the exisling 2@ 36" would provide .
conveyance of an estimated 5 yeaz frequency storm. Analysis also indicates that 2@ 48"
would be required to meet NCDOT current desirable design criterion which is
conveyance of an estimated 25 year frequency storm.
It is recommended that the 2@ 36" RCP be replaced with 2@ 48" CMP with headwall.
The CMP material will help to slow the velociry through the pipe. Due to the potential for
inducing a headcut upstream of the road, it is recommended that the inlet im�ert of the 48"
be placed at the same elevation as the existing 36"invert. Do not bury the inlet as is
standard installation. The outlet invert of the 48" should be placed so that it is not
perched. The existing blowhole should be lined (not completely filled) with class II rip
rap. This wili serve as a plunge pool\energy dissipater. „
� , MAILINGADORE55: . . Te�aHOHE: 91H-250-0100 ' . -� LOCA710N:
NC DEPARTMENTOF TflANSPpRTAT10N FAX: [phone]' ' CENTl1RY CENTER COMPLE% �
HYDRAUUCSUNIT ` � . . � BUIL�INGO
� �1590MntLSE0.VICECENTER . WEgS/7E: WWYV.00H.D07.STATENC.US 702061RCHRIDGEDRWE
- Rn�iGn NC 276894590
' . RALEIGn NC .

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Pg. 2 (SR 2010 Orange County)
During the course of the review it was noted that the downstreain side of the road is
located in a FEMA regulated 100 yeaz flood hazard zone associated with Morgan Creek.
Some of the upsh�eam properiy is located in a FEMA designated 500 yeaz flood plain. It
should be noted that the recommended pipe replacement would not be anticipated to fully
eliminate the potential for flooding of adjacent properties. Howevet, it would be
anticipated to reduce frequency and\or depth of flooding.
If further assistance can be provided,please contact this office.
JLL

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Name:CHAPEL HILL Location: 035°53'46.7" N W9°03'202" W
. Date: 10/62011 . . Caption:Azalea Drive(SR 1210) -
Scale: 1 inch equals 2000 feet . Chapel Hill .
Orange CouMy
Copyrigh�(C)1997,Maptech.Inc. -