20130220 Ver 1_401 Application_20130313

Strickland, Bev
From: Higgins, Karen
Sent: Tuesday, March 05, 2013 3:09 PM
To: Strickland, Bev
Subject: FW: AUCTION DIRECT PROPERTY - PCN 03.04.2013
Attachments: AUCTION DIRECT_PCN_03.04.2013_S &EC 11984.pdf
Importance: High
Hasn't been entered into BIMS yet, but here is the electronic version.
Thanks -
Karen
Karen Higgins
Supervisor, Wetlands, Buffers, Stormwater - Compliance & Permitting Unit
NCDENR - Division of Water Quality
1650 Mail Service Center, Raleigh, NC 27699 -1650
Phone: [phone]
Email: karen.higgins @ncdenr.gov
Website: http: / /Portal.ncdenr.org /web /wq /swp /ws /webscape
E -mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be
disclosed to third parties.
From: Bob Zarzecki [mailto:bzarzecki(a)sandec.com]
Sent: Monday, March 04, 2013 5:11 PM
To: Higgins, Karen; Lucas, Annette; Smith, Cherri L; Dennison, Laurie
Cc: Richmond, Martin; Ed Sconfienza (edCa)thesitegroup.net); Donald. Hyneman(a)Colliers.com; Keya Ushry
Subject: AUCTION DIRECT PROPERTY - PCN 03.04.2013
Importance: High
To All
Attached is the PCN requesting impacts to 1,550 sf of buffer for the pipe replacement at the Auction
Direct property. Three paper copies will be hand delivered to the WBSCP unit tomorrow and one
copy will be hand delivered to the RRO. I believe that the application and attachments include
everything requested and discussed in our pre - application meeting this morning. Please don't
hesitate to contact me if you have any questions or require additional information.
Sincerely,
Bob Zarzecki
Wetlands Department Manager
Soil & Environmental Consultants, PA
11010 Raven Ridge Road

Raleigh, NC 27614
(919) 846 -5900 Office Phone
(919) 256 -4517 Direct Line
(919) 846 -9467 Fax
(919) 270 -2068 Mobile
bzarzeckia- sandec.com
Visit us at SandEC.com!
This electronic communication, including all attachments, is intended only for the named addressee (s) and may contain confidential information. This electronic
communication may not have passed through our standard review /quality control process. Design data and recommendations included herein are provided as a
matter of convenience and should not be used for final design. Rely only on final, hardcopy materials bearing the consultant's original signature and seal. If you
are not the named addressee (s), any use, dissemination, distribution or copying of this communication is prohibited. If you have received this electronic
communication in error, please notify the sender by return e -mail and delete the original communication from your system. Thank you.

Soil & Environmental Consultants, PA
11010 Raven Ridge Road - Raleigh, North Carolina 27614 * Phone: (•19) 846-5900 - Fax: [phone]
www.&qmdEC.-qvm
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& IN
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.4 January 2009
Page 1 of 10
PCN Form — Version 1.4 January 2009
Pre - Construction Notification (PCN) Form
A.
Applicant Information
1.
Processing
1 a.
Type(s) of approval sought from the Corps:
❑ Section 404 Permit ❑ Section 10 Permit
1b.
Specify Nationwide Permit (NWP) number: or General Permit (GP) number:
1c.
Has the NWP or GP number been verified by the Corps?
❑ Yes ❑ No
1d.
Type(s) of approval sought from the DWQ (check all that apply):
❑ 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑X Riparian Buffer Authorization
1 e.
Is this notification solely for the record
because written approval is not required?
For the record only for DWQ
401 Certification:
❑ Yes ❑X No
For the record only for Corps Permit:
❑ Yes ❑ No
1f.
Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank
or in -lieu fee program.
❑ Yes ❑X No
1 g.
Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑ Yes Q No
1h.
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes ❑X No
2.
Project Information
2a.
Name of project:
Auction Direct Storm Drain Replacement
2b.
County:
Wake
2c.
Nearest municipality / town:
City of Raleigh
2d.
Subdivision name:
N/A
2e.
NCDOT only, T.I.P. or state project no:
N/A
3.
Owner Information
3a.
Name(s) on Recorded Deed:
Oberlin Investors, LLC
3b.
Deed Book and Page No.
DB 12778 PG 1383
3c.
Responsible Party (for LLC if
applicable):
Jim Anthony
3d.
Street address:
702 Oberlin Road, Suite 400
3e.
City, state, zip:
Raleigh, INC 27605 -1357
3f.
Telephone no.:
(919) 832 -1110
3g.
Fax no.:
(919) 834 -4488
3h.
Email address:
janthony @aacre.com
Page 1 of 10
PCN Form — Version 1.4 January 2009

4.
Applicant Information (if different from owner)
4a.
Applicant is:
❑ Agent ❑ Other, specify:
4b.
Name:
Oberlin Investors, LLC
4c.
Business name
(if applicable):
4d.
Street address:
702 Oberlin Road, Suite 400
4e.
City, state, zip:
Raleigh, NC 27605 -1357
4f.
Telephone no.:
(919) 832 -1110
4g.
Fax no.:
(919) 834 -4488
4h.
Email address:
janthony @aacre.com
5.
Agent/Consultant Information (if applicable)
5a.
Name:
Bob Zarzecki, S &EC, PA
5b.
Business name
(if applicable):
Soil & Environmental Consultants, PA
5c.
Street address:
11010 Raven Ridge Road
5d.
City, state, zip:
Raleigh, NC 27614
5e.
Telephone no.:
(919) 846 -5900
5f.
Fax no.:
(919) 846 -9467
5g.
Email address:
bzarzecki @sandec.com
Page 2 of 10

B.
Project Information and Prior Project History
1=
Property Identification
1a.
Property identification ''no. (tax PIN or parcel ID):
0787.17.21.2125
1b-
Site coordinates (in decimal degrees):
Latitude: 35.8685 Longitude:'; 78.7225
1 c.
Property size:
8.52 acres
2.
Surface Waters
2a.
Name of nearest body; of water to proposed project:
Turkey Creek (Lake Ann) (Stream Index No. 27- 33 -9 -2)
2b.
Water Quality Classification of nearest receiving water:
B; NSW
2c.
River basin:
Neuse River (HUC 03020201)
3.
Project Description
3a.
The
Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
property is an existing car dealership (Auction Direct, previously Hertz Auto Sales).
3b.
List the total estimated acreage of all existing wetlands on the property: 0
3c.
List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 825
3d. Explain the purpose of the proposed project:
Existing 30" CMP has collapsed and is causing flooding onto the car dealership. The project purpose is to replace the failing CMP w/ new 54" RCP.
3e. Describe the overall project in detail, including the type of equipment to be used:
Pipe closest to the stream will be installed by boring & jacking or tunneling; remaining pipeinstalled byopen cut; riprap @ outfall will be hand placed.
4.
Jurisdictional Determinations
4a.
Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
roject includin all rior hases in the ast?
❑X Yes ❑ No ❑X Unknown
Comments: USACE has verified OHWM of Turkey Creek.
4b.
If the Corps made the jurisdictional determination, what type
of determination was made?
❑X Preliminary ❑ Final
4c.
If yes, who delineated the jurisdictional areas?
Name (if known): Bob Zarzecki
Agency /Consultant Company: S &EC, PA
Other: Verified by Dave Shaeffer (Corps)
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
Dave Shaeffer of the Raleigh Regulatory Field Office of the USACE made the OHWM determination on November 29, 2012 (desk top verification of
S &EC flags & photos). Mr. Shaeffer is in the process of providing a "No Permit Required" verification letter for the project.
5.
Project History
5a.
Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
E] Yes ❑ No ❑X Unknown
5b. If yes, explain in detail according to "help file" instructions.
This is a maintenance project to replace an existing failed storm drain. (USACE verified NWP3 if impacts were needed below OHWM.)
6.
Future Project Plans
6a.
Is this a phased project?
❑ Yes ❑X No
6b.
If yes, explain.
Page 3 of 10
PCN Form - Version 1.4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑ Streams — tributaries ❑X Buffers ❑ Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a.
Wetland impact
number
Permanent (P) or
Temporary T
2b.
Type of impact
2c.
Type of wetland
2d.
Forested
2e.
Type of jurisdiction
Corps (404,10) or
DWQ (401, other)
2f.
Area of
impact
(acres)
W1
Choose one
Choose one
Yes /No
W2
Choose one
Choose one
Yes /No
W3
Choose one
Choose one
Yes /No
W4
Choose one
Choose one
Yes /No
W5
Choose one
Choose one
Yes /No
W6
Choose one
Choose one
Yes /No
2g. Total Wetland Impacts:
0
2h. Comments:
No wetlands exist with the project limits.
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a.
Stream impact
number
Permanent (P) or
Temporary (T)
3b.
Type of impact
3c.
Stream name
3d.
Perennial (PER) or
intermittent (INT)?
3e.
Type of
jurisdiction
3f.
Average
stream
width
(feet)
3g.
Impact
length
(linear
feet)
S1
S2
Choose one
S3
Choose one
S4
Choose one
S5
Choose one
S6
Choose one
3h. Total stream and tributary impacts
o
3i. Comments:
USACE verified the OHWM of Turkey Creek and no impacts /fill proposed below the OHWM. No other waters or streams exist within the project limits.
Page 4 of 10
PCN Form — Version 1.4 January 2009

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 indivi ually list all open water impacts below.
4a.
Open water
impact number
Permanent (P) or
Temporary T
4b.
Name of waterbody
(if applicable)
4c.
Type of impact
4d.
Waterbody
type
4e.
Area of impact (acres)
01
Choose one
Choose
02
Choose one
Choose
03
Choose one
Choose
04
Choose one
Choose
4f. Total open water impacts
0
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, then complete the chart below.
5a.
Pond ID number
5b.
Proposed use or
purpose of pond
5c.
Wetland Impacts (acres)
5d.
Stream Impacts (feet)
5e.
Upland
(acres)
Flooded
Filled
Excavated
Flooded
Filled
Excavated
P1
Choose one
P2
Choose one
5f. Total:
5g. Comments: n/a
5h. Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If any impacts require mitigation, then you MUST fill out Section D of this form.
6a. Project is in which protected basin?
❑X Neuse ❑ Tar - Pamlico ❑ Catawba ❑ Randleman ❑ Other:
6b.
Buffer Impact
number —
Permanent (P) or
Temporary (T)
6c.
Reason for impact
6d.
Stream name
6e.
Buffer
mitigation
required?
6f.
Zone 1
impact
(square
feet)
6g.
Zone 2
impact
(square
feet)
B1 P
Streambank Stabilization
Turkey Creek
No
550
1,000
B2
Yes /No
B3
Yes /No
B4
Yes /No
B5
Yes /No
B6
Yes /No
6h. Total Buffer Impacts:
550
1,000
6i. Comments:
See attached "Buffer Impact Plan for: AUCTION DIRECT PROPERTY ". DWQ verified activity as an "ALLOWABLE" use.
Page 5 of 10

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.
Pipe replacement is in same area and alignment of as existing pipe. To realign pipe would require additional buffer impacts. An "Evaluation of
Potential for Stream Bank Erosion on Opposite Side of Turkey Creek" analysis and report was prepared by the project engineer (see attached).
Construction methods specified to minimize disturbance to existing bank. Construction does not encroach into stream bed.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Pipe installation is by bore & jack as opposed to open cut. Rip rap is to be hand placed.
2.
Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a.
Does the project require Compensatory Mitigation for
impacts to Waters of the U.S. or Waters of the State?
❑ Yes ❑X No
2b.
If yes, mitigation is required by (check all that apply):
❑ DWQ ❑ Corps
2c.
If yes, which mitigation option will be used for this
project?
❑ Mitigation bank
El Payment to in -lieu fee program
❑ Permittee Responsible Mitigation
3.
Complete if Using a Mitigation Bank
3a.
Name of Mitigation Bank:
3b.
Credits Purchased (attach receipt and letter)
Type: Choose one
Type: Choose one
Type: Choose one
Quantity:
Quantity:
Quantity:
3c. Comments:
4.
Complete if Making a Payment to In -lieu Fee Program
4a. Approval letter from in -lieu fee program is attached.
❑ Yes
4b.
Stream mitigation requested:
linear feet
4c.
If using stream mitigation, stream temperature:
Choose one
4d.
Buffer mitigation requested (DWQ only):
square feet
4e.
Riparian wetland mitigation requested:
acres
4f.
Non - riparian wetland mitigation requested:
acres
4g.
Coastal (tidal) wetland mitigation requested:
acres
4h.
Comments:
5.
Complete if Using a Permittee Responsible Mitigation Plan
5a.
If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 6 of 10
PCN Form — Version 1.4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
❑ Yes Q No
buffer mitigation?
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
6c.
6d.
6e.
Zone
Reason for impact
Total impact
Multiplier
Required mitigation
(square feet)
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
6h. Comments: DWQ verified the activity as an "ALLOWABLE" use.
Page 7 of 10

E.
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1.
Diffuse Flow Plan
1 a.
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes ❑X No
within one of the NC Riparian Buffer Protection Rules?
1 b.
If yes, then is a diffuse flow plan included? If no, explain why.
Replacement
of existing pipe is "ALLOWABLE" as determined by DWQ as protection of existing use.
❑ Yes ❑X No
Project involves the replacement of an existing failed stormwater pipe with a new pipe. No new
stormwater
added. Erosion analysis was performed for Turkey Creek (see attached).
2.
Stormwater Management Plan
2a.
What is the overall percent imperviousness of this project?
2b.
Does this project require a Stormwater Management Plan?
❑ Yes Q No
2c.
If this project DOES NOT require a Stormwater Management Plan, explain why:
No
new impervious surface proposed. The project only involves replacement of an existing storm drainage pipe.
2d.
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative
description of the plan:
2e.
Who will be responsible for the review of the Stormwater Management Plan?
3.
Certified Local Government Stormwater Review
3a.
In which local government's jurisdiction is this project?
City of Raleigh
❑X Phase II
Q NSW
3b.
Which of the following locally - implemented stormwater management programs
El USMP
apply (check all that apply):
❑ Water Supply Watershed
❑ Other:
3c.
Has the approved Stormwater Management Plan with proof of approval been
❑Yes ❑ No
attached?
4.
DWQ Stormwater Program Review
❑Coastal counties
❑HQW
4a.
Which of the following state - implemented stormwater management programs apply
❑ORW
(check all that apply):
❑Session Law 2006 -246
❑Other:
4b.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
5.
DWQ 401 Unit Stormwater Review
5a.
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b.
Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1.4 January 2009

F.
Supplementary Information
1.
Environmental Documentation (DWQ Requirement)
1 a.
Does the project involve an expenditure of public (federal /state /local) funds or the
❑ Yes
Q No
use of public (federal /state) land?
1 b.
If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑Yes
❑ No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c.
If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
❑ Yes
❑ No
letter.)
Comments:
2.
Violations (DWQ Requirement)
2a.
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
[]Yes
0 No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b.
Is this an after - the -fact permit application?
❑Yes
0 No
2c.
If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3.
Cumulative Impacts (DWQ Requirement)
3a.
Will this project (based on past and reasonably anticipated future impacts) result in
❑Yes
0 No
additional development, which could impact nearby downstream water quality?
3b.
If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
Further development of contributory upstream property can reasonably be expected. However, the replacement of the existing storm drainage pipe
shouldn't impact future development one way or the other.
4.
Sewage Disposal (DWQ Requirement)
4a.
Clearly detail the ultimate treatment methods and disposition (non- discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
Not applicable
Page 9 of 10
PCN Form — Version 1.4 January 2009

5.
Endangered Species and Designated Critical Habitat (Corps Requirement)
5a.
Will this project occur in or near an area with federally protected species or
❑ Yes ❑ No
habitat?
5b.
Have you checked with the USFWS concerning Endangered Species Act
❑ Yes ❑ No
impacts?
5c.
If yes, indicate the USFWS Field Office you have contacted.
-
5d.
What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
6.
Essential Fish Habitat (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 use to determine whether your site would impact Essential Fish Habitat?
7.
Historic or Prehistoric Cultural Resources (Corps Requirement)
7a.
Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
❑ 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?
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA- designated 100 -year floodplain?
❑ Yes ❑ No
8b.
If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination?
Digitally
Robert DNtcn Robert Zarzecki, o =S &EC!
PA, ou= Wetlands Department,
email= bzarzecki @sandec.com,
S &EC, PA (Attn: Bob Zarzecki)
Zarzecki ° =us
Date: 2013.03.04 15:36:10 - 05'00'
March 4, 2013
Applicant/Agent's Printed Name
Date
Applicant/Agent's Signature
(Agent's signature is valid only if an authorization
letter from the applicant is provided.)
Page 10 of 10

Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
AGENT AUTHORIZATION FORM
All Blanks To Be Filled In By The Contract Purchaser
Name: Oberlin Investors, LLC
Address: 702 Oberlin Road, Suite 400, Raleigh, NC 27605
Phone: 1?1 -j -5,az - 3l eO
Project Name/ Description: 7601 Glenwood Avenue (Auction Direct Site) / Storm Sewer Replacement
S &EC Project #
Date:
4'Z1 z
The Department of the Army
U.S. Army Corps of Engineers, Wilmington District
P.O. Box 1890
Wilmington, NC 28402
Attn: David Shaeffer or Craig Brown
rown
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
6 WN� rn7+aca
I, the c ^^ r, hereby designate and authorize Soil & Environmental Consultants, PA to act in
my behalf as my agent in the processing of permit applications, to furnish upon request supplemental
information in support of applications, etc. from this day forward. The J - 9 ' day of i 20 1 Z-
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE: This authorization, for liability and professional courtesy reasons, is valid only for
government officials to enter the property when accompanied by S &EC staff. You should call S &EC
to arrange a site meeting prior to visiting the site.
dB 11, I P ! V V K5 ; 1. Gz—
Print C---'----`" °- 's Name
cc: Ms. Karen Higgins
NCDENR - DWQ WeSCAPe
Archdale Building
512 N. Salisbury Street, 91h Floor
Raleigh, NC 27604
Co a Purchaser's Signature
cc: Mr. Bob Zarzecki
Soil & Environmental Consultants, PA

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0511711,
Attention
From:
Project:
Subject:
Cc:
Lisa Booze, City of Raleigh
Ed Sconfienza, P.E.
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MEMQRANDUM
28 February 2013
Job: US70A❑
Auction Direct Storm Drainage Replacement (Transaction # 351243)
Evaluation of Potential for Stream Bank Erosion on Opposite Side of Turkey Creek
DWQ: Annette Lucas, Martin Richmond; S &EC: Bob Zarzecki
We have prepared this memo to address plan review comment on the above reference project dated 216113:
"Staff also is concerned abort the erosive velocity of stormwater (206 cfs) at 27 fps and possible
erosion on the opposite bank."
In evaluating this concern, we relied on Floodway Data and Flood Profiles from the Wake County Flood
Insurance Study (attached) using the 10 year storm for our analysis. Based on this data source, we
established the following for the stream channel:
d,o - 6' W. S. Elev,o - 293.5 010 — 1060 cfs @ 4.5 fps
The object of the analysis was to determine if the opposite bank of the channel would be subject to erosive
forces due to replacement of the existing 30" CMP with a 54" RCP. The methodology we used to analyze
this potential was an evaluation of combining the momentum from the existing stream with the momentum
from the proposed 54" RCP. The basic momentum equation is:
P = (m'v)Ig where: P = momentum (lbs); m = mass (dimensionless); v = velocity; g = 32.2 ftlsec2
For the stream: P = (1060 ft3lsec )(62,4 Iblft3)(4.5 ft/sec)/(32.2 ftlsec2) = 9,245 lb
For the 54" RCP: P = (206 ft3 /sec)(62.4 Ib1ft)(27 ft/sec)/(32.2 ftlseC2) = 10,780 lb
For the purpose of the analysis; the force vector of the upstream channel was used as the inertial coordinate
system; that is, coincidental and normal force vectors are relative the direction of the force vector of the
upstream channel. The attached Momentum Analysis Schematic shows the component and resultant
momentum force vectors of the upstream channel, the piped now and the downstream flow. It also shows the
angle of the force vectors relative to the inertial reference frame.
Our analysis indicates the force of the flow in Turkey Creek will divert the flow from the 54" RCP such that
any effect to the opposite channel will occur well downstream of the proposed outfal1. Further, it appears that
the flow in Turkey Creek flow is adequate to turn the momentum of the pipe now such that any erosive effect
will be negligible. This is in part due to a change in direction of the existing channel at the point where the
existing and proposed pipes discharge to the stream. We considered the momentum analysis as well as
other factors, including observing existing well established buffer vegetation on the opposite shore, the
bedrock stream channel and a 6' depth of flow in the stream during the 10year storm event that serve to
mitigate any impact from the proposed pipe replacement in reaching our conclusion.
Our conclusion is that the proposed pipe replacement will not result in erosion on the opposite bank and that
rip rap or other stabilization measures on the opposite bank are not warranted.
The Site Group Phone: 919 - 835 -4787
1111 Oberlin Road Fax: [phone]
Raleigh, North Carolina 27605 www.thesitegroup.net

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