20150539 Ver 1_401 Application_20150615

PIETA Environmental Consultant$ AU®
34 Castlewood Drive
Clayton, NC 27520
(919) 624 -8825
May 22, 2015 2 O
,
NC DWQ, WBSCP Unit
1650 Mail Service Center
Raleigh, NC 27699 -1650
Raleigh Regulatory Field Office
USACE
3331 Heritage Trade Drive — Suite 105
Wake Forest, NC 27587 FJ Re: Pre - Construction Notification for Parkview Subdivision City Road, Clayton, NC 27520 2015
PIN #:165912 -97 -7376 + I
Dear Sir /Madam:
Please find attached the PCN, plans, and supporting documentation for the Parkview Subdivision,
a proposed residential subdivision located in Clayton, North Carolina. There are three impact
areas — Impact Area B -1, Impact Area B -2, and Impact Area B -3. Impact Area B -1 consists of
removing an existing culvert and installing a larger culvert required to construct a Town of
Clayton standard road to serve the first phase of the subdivision consisting of 42 single- family
lots located on a 32.24 acre tract. Impact area B -1 is proposed to have stream impacts authorized
under a NWP 29 and riparian buffer impacts. Impact Areas B -2 and B -3 are proposed to have
riparian buffer impacts only.
Description of Stream Impacts (Impact Area B-1):
The existing 22 LF 18" RCP culvert is located on the south (upstream) side of a constructed farm
pond located on the eastern portion of the site. There is an additional 1 foot of stream impact
associated with fill on the inlet side of the existing culvert used as inlet protection. The total
existing stream impact is 23 LF. A dirt/gravel farm path currently crosses the stream at this
location. The proposed improvements include replacing the existing culvert with a longer and
larger RCP pipe that will be sized to adequately convey at minimum the 25 -year, 24 -hour storm
event as required by the Town of Clayton's roadway design construction standards. The length of
the pipe will be approximately 63 linear feet with headwalls at both the inlet and outlet of the
pipe. An additional 10 feet of riprap is proposed at the outlet of the culvert to prevent scouring
for a total proposed impact of 73 linear feet. The net increase in stream impact for this crossing is
50 LF (73 LF Proposed — 23 LF Existing).

Description of Riparian Buffer Impacts:
Impact Area 13-1:
There is currently 1,646 ft' of existing Zone l impact and 547 ft' of Zone 2 impact associated
with the existing farm path crossing at the culvert. This summary does not include the existing
riparian buffer impacts associated with the farm path around the pond. Other than the impacts
associated with a� level spreader bypass pipe (see Impact Area B -2 below) no additional riparian
buffer impacts are proposed around the pond. The proposed subdivision road will use the same
alignment as the farm path crossing, but will have a larger footprint and increased buffer impacts
associated with the increased roadway width, sidewalk, and right -of -way. The total proposed
new buffer impacts for the roadway include 3,636 ft2 in Zone I and 2,395 ft' in Zone 2.
Impact Area B -2:
The riparian buffer impacts for this area are all associated with the high flow bypass pipe and
riprap dissipater pad. There are proposed 450 ft' Zone l and 266 ftZ Zone 2 impacts.
Impact Area B -3:
The riparian buffer impacts for this area are all associated with the high flow bypass channel lined
with riprap and geotextile fabric. There are proposed 546 ft' Zone l and 285 ftZ Zone 2 impacts.
Stormwater and Diffuse Flow
The proposed development is subject to the Nutrient Sensitive Waters (NSW) stormwater
regulations administered by Johnston County. The farm pond water elevation is currently
controlled by a 34 LF 18" vitrified clay pipe (VCP) outlet. This outlet will be replaced with an
engineered riser structure so that the pond can be used to attenuate the additional runoff
associated with the proposed impervious surfaces of the subdivision. The Town of Clayton has
an intergovernmental agreement with Johnston County for stormwater review and approval for
new developments. Full construction plans, stormwater calculations, and nutrient calculations
will be sent to Johnston County concurrently with this PCN for approval.
Diffuse flow will be achieved by the use of flow splitter boxes and level spreaders. Impact Area
B -1 will have a double splitter box which divides the expected flow generated from the 1" per
hour storm event into two equal flows of approximately 1 CFS each. Each of the low flow outlets
will be piped using 6" CPP to proposed pre - formed scour hole level spreaders. All flows higher
than the 1" per hour storm will flow through a 24" high flow bypass RCP. The high flow bypass
pipe will discharge via a flared end section into a dissipater pad prior to flowing into the existing
pond.
Impact Area B -2 will meet the diffuse flow requirement by the use of a splitter box manhole and
a standard 40 ft. long level spreader used to treat 0.77 CFS expected from the 1" per hour storm
event. Higher flows will be directed into a 24" RCP that outlets into a riprap w/ geotextile fabric
lined channel that will discharge into Sam's Branch.
If any additional information is needed, please advise.
Sincerely,
amie Guerrero, PE, CPSWQ
PNTA Environmental Consultants

PNTA Environmental Consultants
34 Castlewood Drive
Clayton, NC 27520
(919) 624 -8825
AGENT AUTHORIZATION FORM
PROPERTY LEGAL DESCRIPTION:
Property Site Address: N/A
Description /Location: A 34.24 acre parcel located within the Town of Clayton, Johnston
County North Carolina on the west side of City Road and 1500 feet north of -the intersection of
City Road and W. Stallings Street in Clayton, North Carolina.
NC PIN #: 165912 -97 -7376
Property Owner(s): City Road, LLC
DEED: 04557 Book 0814 Page
Property Owner(s):
The undersigned, registered property owner(s) of the above noted property, do hereby authorize
Jamie B. Guerrero, PE, CPSWQ of PNTA Environmental Consultants to act on my behalf
and take all actions necessary for the processing, issuance, and acceptance of this permit or'
certification and any and all standard and special conditions attached associated with obtaining
Jurisdictional Determinations and Clean Water Act, Section 401 Certifications /Permits for the
above described property.
Property Owner's Address (if different than property above):
205 Athletic Club Blvd Clayton North Carolina 27527
Property Owner's Telephone: 919 - 763 -7278
EXECUTED THIS . DAY OF , 20 /9
iy
I!' Alt C� ,&o CL C
SIGNATURE OF PPIOPERTY OWNER
SIGNATURE OF PROPERTY OWNER

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Office Use Only -
Corps action ID no
DWQ project no.
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
1 b. Specify Nationwide Permit (NWP) number: 29 or General Permit (GP) number:
1 c. Has the NWP or GP number been verified by the Corps?
❑ Yes © No
1 d. Type(s) of approval sought from the DWQ (check all that apply):
© 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express © Riparian Buffer Authorization
1 e. Is this notification solely for the record
because written approval is not required?
For the record only for DWQ
401 Certification:
❑ Yes © No
For the record only for Corps Permit.
❑ Yes Q 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
1g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑Yes 0 No
1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes Q No
2. Project Information
2a. Name of project:
Parkview Residential Subdivision
2b. County:
Johnston
2c. Nearest municipality / town:
Clayton
2d. Subdivision name:
Parkview
2e. NCDOT only, T.I.P. or state project no:
3. Owner Information
3a. Name(s) on Recorded Deed:
City Road, LLC
3b. Deed Book and Page No.
DB 04557 PG 0814
3c. Responsible Party (for LLC if
applicable):
Donald C. Adams
3d. Street address:
205 Athletic Club Blvd
3e. City, state, zip:
Clayton, NC 27520
3f. Telephone no.:
(919) 763 -7278
3g. Fax no.:
3h. Email address:
donnie @dcadamspe 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:
4c. Business name
(if applicable):
4d. Street address:
4e. City, state, zip:
4f. Telephone no.:
4g. Fax no.:
4h. Email address:
5. Agent/Consultant Information (if applicable)
5a. Name:
Jamie Guerrero, PE, CPSWQ
5b. Business name
(if applicable):
PNTA Environmental Consultants
5c. Street address:
34 Castlewood Drive
5d. City, state, zip:
Clayton, NC 27520
5e. Telephone no.:
(919) 624 -8825
5f. Fax no.:
5g. Email address:
pntaengineer @embargmail.com
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
165912 -97 -7376
1 b. Site coordinates (in decimal degrees):
I Latitude: 35.6645 Longitude: - 78.46227
1 c. Property size:
34.24 acres
2. Surface Waters
2a. Name of nearest body of water to proposed project:
Sam's Branch
2b. Water Quality Classification of nearest receiving water:
C -NSW
2c. River basin:
Neuse
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
Agricultural farm land adjacent to residential and agricultural zoned areas.
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: 1,074
3d. Explain the purpose of the proposed project:
Development of a residential single- family home and town home subdivision
3e. Describe the overall project in detail, including the type of equipment to be used:
Clearing and grubbing using general mechanized construction equipment Mass grading for purpose of construction roads, infrastructure, and residenti
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past?
❑ Yes 0 No ❑ Unknown
Comments:
4b. If the Corps made the jurisdictional determination, what type
of determination was made?
❑ Preliminary ❑ Final
4c. If yes, who delineated the jurisdictional areas?
Name (if known):
Agency /Consultant Company:
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑ Yes ❑X No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project?
X❑ Yes ❑ No
6b. If yes, explain.
The residential development is planned for two phases. This PCN is for the first phase of the development. Any future phases will include
environmental impacts associated with this first phase.
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 Q 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
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:
2h. Comments:
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 P
Culvert
UT to Sam's Branch
PER
Corps
6
50
S2 -
Choose one
S3 -
Choose one
S4 -
Choose one
S5 -
Choose one
S6 -
Choose one
3h. Total stream and tributary impacts
50
31. Comments -
The existing culvert impacts 23 LF of stream This culvert well be removed and replaced with a larger culvert with an increased impact to the stream of
50 linear feet. Headwalls will be installed on both sides of the culvert in order to minimize total length of new culvert.
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 individually list all open water impacts below.
4a.
Open water
impact number
Permanent (P) or
Temporary
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
4g. Comments-
6. Pond or Lake Construction
If pond or lake construction proposed, the 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
Pi
Choose one
P2
Choose one
5f. Total:
5g. Comments:
5h. Is a dam high hazard permit required?
Yes E] No If yes, permit ID no:
5i. Expected pond surface area (acres):
5l. 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?
pX Neuse [J Tar - Pamlico [3 Catawba [] Randleman ❑ Other:
6b.
Buffer Impact
number —
Permanent (P) or
Temporary
6c.
Reason for impact
6d.
Stream name
6e.
Buffer
mitigation
required?
6f.
Zone 1
impact
(square
feet )
6g.
Zone 2
impact
(square
feet
131 P
Roadway crossing
UT to Sam's Branch
No
3,026
2,168
B2 P
Level Spreader Bypass
UT to Sam's Branch
No
450
266
B3 P
Level Spreader Bypass
Sam's Branch
No
546
285
B4 -
Yes/No
B5 -
Yes/No
B6 -
Yes/No
6h. Total Buffer Impacts:
4,022
2,719
6i. Comments: There is an existing buffer impact associated with the farm path and crossing. The existing buffer impacts have been subtracted
from the new proposed impact leading to the net increase total above
Page 5 of 10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
la Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Proposed new road is located in the same area as the existing farm path crossing. The wasting culvert will be removed and replaced with a larger size
pipe to adequately convey the peak flow from the 25 year, 24 hour storm event.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
This project requires an approved erosion control plan. All erosion control measures will be installed in accordance to the approved plan. The culvert
replacement will occur during low flow /no flow conditions. The use of cofferdams and bypass pumping will be used if necessary to ensure that all work
is conducted in the dry.
2. Compensator 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 ® 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
❑ 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 ln4ieu 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 X❑ 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: All impacts associated with this project are listed as allowable within the Table of Uses for buffer impacts.
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 ❑ 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.
Q Yes ❑ No
2. Stormwater Management Plan
2a. What is the overall percent imperviousness of this project?
10.3%
2b. Does this project require a Stormwater Management Plan?
© Yes ❑ No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why:
2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan -
This project requires an approved Stormwater Management Plan from Johnston County. The SWMP is being submitted to Johnston County in
concurrence with the PCN submittal.
2e. Who will be responsible for the review of the Stormwater Management Plan?
Johnston County (via interlocal agreement)
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
Clayton
❑ Phase II
3b. Which of the following locally - implemented stormwater management programs
© NSW
apply (check all that apply):
❑ USMP
❑ 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
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
letter.)
❑ Yes
❑ No
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
❑ Yes
®No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after -the -fact permit application?
❑ Yes
ZX 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
E] Yes
Eg 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.
This project is a multi-phase residential subdivision subject to the Neuse Riparian Buffer rules and NSW stormwater rules.
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.
Sewer
service will be provided by the Town of Clayton.
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 OX 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?
NC Natural Heritage Database
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
0 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?
FIRM Map as shown on Johnston County GIS mapping website
Applica n s rinted Name
Date
Applicant/Agenrs Signature
(Agents signature is valid only if an authorization
letter from the applicant is provided
Page 10 of 10

LEVEL SPREADER
CALCULATIONS

PARKVIEW SUBDIVISION
CLAYTON, NORTH CAROLINA
MAY 22, 2015
This is a photograph of the farm pond on the subject property. The dam is in the background. A double
splitter box is proposed so that the runoff generated from a 1" per hour rain event will be split into two
equal flows of about 1 CFS each and discharge into two pre- formed scour hole level spreaders designed
to provide diffuse flow into the pond. No constructed vegetative filter strip is proposed since the area is
already well vegetated.
This is the existing farm path and crossing as shown as identified in the plans as Impact Area B -1. To the
left in the tree lines is a jurisdictional stream that flows through an existing pipe into the farm pond. The
proposed road serving the subdivision will cross the stream /pond at this location. The existing pipe will
be removed and a new larger and longer culvert will be installed. There will be an additional 50 LF of
stream impact from the larger pipe.

This is the farm pond standing on the dam looking upstream toward the existing farm path crossing.
There is an existing farm path that runs around the pond and across the dam. The farm path consists of
compacted earth and crusher run gravel in some areas. With the exception of the proposed road
crossing and level spreader bypass pipe, there will be no additional riparian buffer impacts to the pond.
Just at the wood line is the approximate location of Level Spreader #2. There is no constructed
vegetative filter strip proposed at this location since it is heavily vegetated with a gentle slope (< 5 %). A
splitter box will be used so that the runoff generated from the 1" per hour storm event is directed to the
level spreader. Higher flows will bypass the level spreader and flow into a riprap with geotextile lined
channel that discharges into Sam's Branch. The channel will be lined with riprap due to the heavily
forested riparian buffer will not provide enough sunlight to support a vegetative channel.

Culvert ST 16b
PARKVIEW - BEHIND LOTS 15 & 16
Determine Composite "C" value:
Area in
1
"C" value for area
A *C
acres (A)
574
1 1 92 0.40
077
2
0.00
3
000
4
000
5
0.00
6
000
Total 1 92
077
Composite "C" value:
0.40
Intensity
1"
1
1 yr
493
2 y
574
10 yr
736
25 yr
817
Discharge (Q =CIA)
1"
0 8 CFS
1 yr
3 8 CFS
2 yr
4.4 CFS
10 yr
57 CFS
25 yr
6.3 CFS
FLOWS FOR LEVEL SPREADER DESIGN.xlsx 5/9/2015 10 52 AM

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NCDENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS -VFS) SUPPLEMENT
This kwm must be Maly fi%d ou4 prated, in&W4 and submitted.
4AWBEC[ 1NFQRiIlFATfO' ' = �'
Project name PARiMEW SUBDIVISION
Contact name DONNIE ADAMS, PE
Phone number
Date
Drainage area number
(919) 763 -7278
May 20, 2015
IMPACT AREA B-3
OrJT ,2lRTE9OG
ti
!I. QE II��HIF�fAItQN
The purpose of the LS -VFS Buffer Rule- Diffuse Flow
Stormwater enters LS -VFS from The drainage area
Type of VFS Protected riparian buffer (slope < 5 %)
Explanation of any "Other" responses above
If Stormwater Enters the LS-VFS from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in/hr storm
Time of concentration
Rainfall intensely, 10 -yr storm
Peak flow from the 10 -yr storm
Design stone
Maximum amount of flow directed to the LS -VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
If Stormwater Enters the LS -VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10 -year storm
Maximum capacity of a 100 -foot long LS -VFS
Peak flow directed to the LS-VFS
Is a flow bypass system going to be used?
Explanation of any "Other responses above
83,636 fte
43,400 rye
5189 %
040
077 cis
500 min
736 inthr
5.65 cis
1 inch/hour storm
0 77 cis
Y (Y or N)
Do not complete this section of the form
cis
cis Do not complete this section of the form,
2 cis
cis Do not complete this section of the form
(Y or N)
Form SW401 - LS-VFS - Mune2012 - Rev 10 page 1 of 3

LS -VFS Design
Forebay surface area
Depth of forebay at stonmwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cis
Computed minimum length of the level lip needed
Length of level lip provided
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10 -year storm)
freeboard (during the 10 -year storm)
Peak velocity in the channel during the 10-yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
100
sq ft
18
in
6
in
50
fticfs
39
ft
40
ft
60
ft
239.10
fmsl
23800
fmsl
1.83
%
N
(Y or N)
N
(Y or N)
Forebay is adequately sized
Depth is appropriate
OK
Y (Y or N)
Y (Y or N) Please provide plan detart of flour splitter & supporting calcs
250 ft
150 ft
1050 ft
180 ft
126 ft
086 Alsec
Other Explained below
N (Y or N)
Y (Y or N)
Bypass is a 24' RCP with FES and engineered nprap dissipater pad
W
B
Form SW401 - LS-VFS - 29June2012 - Rev. 10 page 2 of 3

111. R -QUf jENJITEMSyCHECKUST '
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the
following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been
met, attach justification.
Requried Item: Initials Page or plan sheet number and any notes:
1 Plans (1' - 50' or larger) of the entire site showing-
- Design at ultimate build -out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement
2 Plan details (1" = 30' or larger) for the level spreader showing:
- Forebay (d applicable),
High flow bypass system,
One foot topo fines between the level lip and top of stream bank,
Proposed drainage easement, and
- Design at ultimate build -out
3 Section view of the level spreader (1" = 20' or larger) showing.
- Underdram system (if applicable),
Level hp,
Upslope channel, and I
Downslope filter fabric.
4 Plan details of the flow splitting device and supporting calculations (if applicable).
5 A construction sequence that shows Crow the level spreader will be protected from
sediment until the entire drainage area is stabilized
i
6. If a non - engineered VFS is being used, then provide a photograph of the VFS stowing
that no draws are present
7 The supporting calculations.
i
8 A copy of the signed and notarized operation and maintenance (0 &M) agreement
I
Form SW401 - LS-VFS - 29June2012 - Rev 10 page 3 of 3

A CT Av E A J" �
• e-v,A :�ys-2c:Cte✓ 2_
1 " /HR STORM EVENT
PARKVIEW LEVEL SPREADERS Rainfall Duration =60 min, Inten =1.00 in/hr
Prepared by Microsoft Printed 5/25/2015
HydroCAD® 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 4S: DA -2
Runoff = 0.77 cfs @ 0.09 hrs, Volume= 0.064 af, Depth= 0.40"
Runoff by Rational method, Rise /Fall= 1.0/1.0 xTc, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Rainfall Duration =60 min, Inten =1.00 in /hr
Area (ac) C Description
1.920 0.40
1.920 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
_(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
0.77 cfs
0.7
1
0.5
c 0.4
U-
0.3
0.2
0.1
0
0
Subcatchment 4S: DA -2
Hydrograph
r
Rainfall
Duration =60 min,
lnten =1.00 in/hr
Runoff Area =1.920 ac
Runoff Volume =0.064 of
Runoff Depth = 0.40"
Tc =5.0 min
C =0.40
Time (hours)
2
3
■ Runoff

L:-,v -c-L_ ciZ Z
1 " /HR STORM EVENT
PARKVIEW LEVEL SPREADERS Rainfall Duration =60 min, Inten =9.00 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCAD® 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 6
Summary for Pond 5P: SB -2
Inflow Area =
1.920 ac,
0.00% Impervious, Inflow Depth = 0.40"
Inflow =
0.77 cfs @
0.09 hrs,
Volume= 0.064 of
Outflow =
0.77 cfs @
0.09 hrs,
Volume= 0.064 af, Atten= 0 %, Lag= 0.0 min
Primary =
0.77 cfs @
0.09 hrs,
Volume= 0.064 of
Secondary =
0.00 cfs @
0.00 hrs,
Volume= 0.000 of
Routing by Stor -Ind method, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Peak Elev= 242.68'@ 0.09 hrs
Flood Elev= 246.90'
v Primary OutFlow Max =0.77 cfs @ 0.09 hrs HW= 242.68' (Free Discharge)
t-1= Orifice /Grate (Orifice Controls 0.77 cfs @ 4.69 fps)
Secondary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 241.50' (Free Discharge)
t-2= Culvert ( Controls 0.00 cfs)
t-3=Sh a rp-C rested Rectangular Weir ( Controls 0.00 cfs)
C
C
'v C
c C
" C
C
0
Pond SP: SB -2
Hydrograph
0 1 2 3
Time (hours)
■ Inflow
E-1 Outflow
® Primary
Secondary
Device
Routing
Invert
Outlet Devices
71)
#1
Primary
241.50'
5.5" Vert. Orifice /Grate C= 0.600
#2
Secondary
241.50'
24.0" Round Culvert
L= 71.0' RCP, groove end projecting, Ke= 0.200
Inlet / Outlet Invert= 241.50'/ 240.80' S= 0.0099 T Cc= 0.900
?�
n= 0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3
Device 2
242.68'
4.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s)
v Primary OutFlow Max =0.77 cfs @ 0.09 hrs HW= 242.68' (Free Discharge)
t-1= Orifice /Grate (Orifice Controls 0.77 cfs @ 4.69 fps)
Secondary OutFlow Max =0.00 cfs @ 0.00 hrs HW= 241.50' (Free Discharge)
t-2= Culvert ( Controls 0.00 cfs)
t-3=Sh a rp-C rested Rectangular Weir ( Controls 0.00 cfs)
C
C
'v C
c C
" C
C
0
Pond SP: SB -2
Hydrograph
0 1 2 3
Time (hours)
■ Inflow
E-1 Outflow
® Primary
Secondary

:r'tA m ':T Av,,<R -A3--3
Si- R6'DgR 4i2,
010 STORM EVENT
PARKVIEW LEVEL SPREADERS Q10 Rainfall Duration =60 min, Inten =7.36 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCAD® 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 4S: DA -2
Runoff = 5.70 cfs @ 0.09 hrs, Volume= 0.471 af, Depth= 2.94"
Runoff by Rational method, Rise /Fall= 1.0/1.0 xTc, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Rainfall Duration =60 min, Inten =7.36 in /hr
Area (ac) C Description
1.920 0.40
1.920 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
5.70 cfs
4
0 3
U.
1
Subcatchment 4S: DA -2
Hydrograph
Rainfall
Duration =60 min,
Inten =7.36 in /hr
Runoff Area =1.920 ac
Runoff Volume =0.471 of
Runoff Depth= 2.94"
Tc =5.0 min
C =0.40
0 1 2
Time (hours)
K?
■ Runoff

N
J
w
r.-
F
Q10 STORM EVENT
PARKVIEW LEVEL SPREADERS Q10 Rainfall Duration =60 min, Inten =7.36 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCAD® 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 6
Summary for Pond 5P: SB -2
Inflow Area = 1.920 ac, 0.00% Impervious, Inflow Depth = 2.94"
Inflow =
5.70 cfs @
0.09 hrs,
Volume=
0.471 of
Outflow =
5.70 cfs @
0.09 hrs,
Volume=
0.471 af, Atten= 0 %, Lag= 0.0 min
Primary =
0.97 cfs @
0.09 hrs,
Volume=
0.085 of
Secondary =
4.73 cfs @
0.09 hrs,
Volume=
0.386 of
Routing by Stor -Ind method, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Peak Elev= 243.22'@ 0.09 hrs
Flood Elev= 246.90'
Device Routing Invert Outlet Devices
#1 Primary 241.50' 5.5" Vert. Orifice /Grate C= 0.600
#2 Secondary 241.50' 24.0" Round Culvert
L= 71.0' RCP, groove end projecting, Ke= 0.200
Inlet/ Outlet Invert= 241.50'/240.80' S= 0.0099 T Cc= 0.900
n=0.012 Concrete pipe, finished, Flow Area= 3.14 sf
#3 Device 2 242.70' 4.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s)
Primary OutFlow Max =0.97 cfs @ 0.09 hrs HW= 243.22' (Free Discharge)
t-1= Orifice /Grate (Orifice Controls 0.97 cfs @ 5.87 fps)
Secondary OutFlow Max =4.73 cfs @ 0.09 hrs HW= 243.22' (Free Discharge)
t- 2= Culvert (Passes 4.73 cfs of 13.48 cfs potential flow)
t-3= Sharp- Crested Rectangular Weir (Weir Controls 4.73 cfs @ 2.35 fps)
3
0
W
Pond 5P: SB -2
Hydrograph
0 1 2 3
Time (hours)
■ Inflow
C' Outflow
i Primary }� L'e
Secondary 3,�:5

��n HWENR
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
LEVEL SPREADER - VEGETATED FILTER STRIP (LS -VFS) SUPPLEMENT
This form must be completely filled out, printed, initialed, and submitted.
1. PROJECT INFORMATION
Project name PARKVIEW
Contact name DONNIE ADAMS, PE
Phone number (919) 763 -7278
Date May 20, 2015
Drainage area number Impact Area B -2
Oa J: W A7fAq
h
Il. DESIGN INFORMATION
The purpose of the LS -VFS Buffer Rule: Diffuse Flow
Stormwater enters LS -VFS from The drainage area
Type of VFS Protected riparian buffer (slope < 5 %)
Diffuse flow for this area is proposed to
be achieve by the use of two level spreader scour
Explanation of any "Other responses above holes each receiving 1 CFS. Higher flows will by directed to a bypass pipe.
If Stormwater Enters the LS -VFS from the Drainage Area
Drainage area
Impervious surface area
Percent impervious
Rational C coefficient
Peak flow from the 1 in /hr storm
Time of concentration
Rainfall intensity, 10 -yr storm
Peak flow from the 10 -yr storm
Design storm
Maximum amount of flow directed to the LS -VFS
Is a flow bypass system going to be used?
Explanation of any 'Other* responses above
If Stormwater Enters the LS -VFS from a BMP
Type of BMP
Peak discharge from the BMP during the design storm
Peak discharge from the BMP during the 10 -year storm
Maximum capacity of a 100 -foot long LS -VFS
Peak flow directed to the LS -VFS
Is a flow bypass system going to be used?
Explanation of any "Other" responses above
217,637 fl?
41,598 ft2
19.11 %
0.40
2.00 cfs
5.00 min
7.36 in/hr
14.71 cfs
1 inch/hour storm
1 cfs
Y (Y or N)
A double splitter box divides the flow from the 1 in/hr storm event into two equal 1.0 CFS
flows.
Do not complete this section of the form.
Pick one:
cis
cfs Do not complete this section of the form.
2 cfs
cis Do not complete this section of the form
(Y or N)
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 1 of 3

LS -VFS Design
Forebay surface area
Depth of forebay at stormwater entry point
Depth of forebay at stormwater exit point
Feet of level lip needed per cfs
Computed minimum length of the level lip needed
Length of level lip provided
Width of VFS
Elevation at downslope base of level lip
Elevation at the end of the VFS that is farthest from the LS
Slope (from level lip to the end of the VFS)
Are any draws present in the VFS?
Is there a collector swale at the end of the VFS?
Bypass System Design (if applicable)
Is a bypass system provided?
Is there an engineered flow splitting device?
Dimensions of the channel (see diagram below):
M
B
W
y (flow depth for 10 -year storm)
freeboard (during the 10 -year storm)
Peak velocity in the channel during the 10 -yr storm
Channel lining material
Does the bypass discharge through a wetland?
Does the channel enter the stream at an angle?
Explanation of any "Other" responses above
sq ft
in
in
50 ft/cfs
50 ft
ft
60 ft
276.50 fmsl
274.00 fmsl
4.17 %
N (Y or N)
N (Y or N)
Y (Y or N)
Y (Y or N) Please provide plan details of flow sphtter & supporting calcs
wrn
It
N/A
ft
N/A
ft
N/A
ft
N/A
ft
tt/sec
Other. Explained below
N (Y or N)
N/A (Y or N)
Bypass is a 24" RCP with FES and engineered dprap dissipater pad. Bypass channel
discharges into an existing farm pond.
'IN
1
B
Form SW401 - LS-VFS - 29June2012 - Rev. 10 page 2 of 3

III: REQUIRED ITEMS CHECKLIST
EDIT Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the
following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been
met, attach justification.
Requried Item:
1. Plans (1" - 50' or larger) of the entire site showing:
- Design at ultimate build-out,
Off -site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
Forebay (if applicable),
High flow bypass system,
Maintenance access,
Proposed drainage easement and public right of way (ROW), and
Boundaries of drainage easement.
Plan details (1" = 30' or larger) for the level spreader showing:
Forebay (f applicable),
High flow bypass system,
One foot topo lines between the level lip and top of stream bank,
Proposed drainage easement, and
Design at ultimate build -out.
Section view of the level spreader (1" = 20' or larger) showing:
- Underdrain system (if applicable),
- Level lip,
- Upslope channel, and
- Downslope filter fabric.
4. Plan details of the flow splitting device and supporting calculations (if appkable).
5. A construction sequence that shows how the level spreader will be protected from
sediment until the entire drainage area is stabilized.
If a non - engineered VFS is being used, then provide a photograph of the VFS showing
that no draws are present.
7. The supporting calculations.
8. A copy of the signed and notarized operation and maintenance (O&M) agreement.
Initials Page or plan sheet number and any notes:
Form SW401 - LS -VFS - 29June2012 - Rev. 10 page 3 of 3

Culvert ST 1
PARKVIEW - BETWEEN LOTS 2 & 3
Determine Composite "C" value:
Area in
1
"C" value for area
A'C
acres (A)
5.74
1 5.01 0.40
2.00
2
0.00
3
0.00
4
0.00
5
0.00
6
0.00
Total 5.01
2.00
Composite "C" value:
0.40
Intensity
1"
1
1 yr
4.93
2 yr
5.74
10 yr
7.36
25 yr
8.17
Discharge (Q =CIA)
1"
2.0 CFS
1 yr
9.9 CFS
2 yr
11.5 CFS
10 yr
14.7 CFS
25 yr
16.4 CFS
FLOWS FOR LEVEL SPREADER DESIGN.xlsx 5/9/2015 10:52 AM

sr- Av -4ct- ARe 3 -Z
1 " /HR STORM EVENT
PARKVIEW LEVEL SPREADERS Rainfall Duration =60 min, Inten =1.00 in/hr
Prepared by Microsoft Printed 5/25/2015
HydroCADO 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 1
Summary for Pond 3P: DSB -1
(57] Hint: Peaked at 278.76' (Flood elevation advised)
Inflow Area = 5.010 aq 0.00% Impervious, Inflow Depth = 0.40"
Inflow =
2.02 cfs @
0.09 hrs,
Volume=
0.167 of
Outflow =
2.02 cfs @
0.10 hrs,
Volume=
0.167 af, Atten= 0 0/4 Lag= 0.6 min
Primary =
1.01 cfs @
0.10 hrs,
Volume=
0.083 of
Secondary=
1.01 cfs@
0.10 hrs,
Volume=
0.083 of
Tertiary =
0.00 cfs @
0.10 hrs,
Volume=
0.000 of
Routing by Stor -Ind method, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Peak Elev= 278.76'@ 0.09 hrs
Device Routing Invert Outlet Devices
#1 Primary 277.70' 4.0" W x 4.0" H Vert. Orifice /Grate X 2.000= 0.600
#2 Secondary 277.70' 4.0" W x 4.0" H Vert. Orifice /Grate X 2.000= 0.600
#3 Device 4 278.76' 4.3' long x 0.5' breadth Broad - Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00
Coef. (English) 2.80 2.92 3.08 3.30 3.32
'H #4 Tertiary 277.70' 24.0" Round Culvert L= 96.0' RCP, groove end projecting, Ke= 0.200
r I Inlet/ Outlet Invert= 277.70'/276.50' S= 0.0125'/' Cc= 0.900
V+ y� n=0.012, Flow Area= 3.14 sf
14 Primary OutFlowMax =1.01 cfs@ 0.10 hrs HW= 278.76' (Free Discharge)
t- 1= Orifice /G rate (Orifice Controls 1.01 cfs @ 4.55 fps)
Secondary OutFlowMax =1.01 cfs@ 0.10 hrs HW= 278.76' (Free Discharge)
1T2= Orifice /Grate (Orifice Controls 1.01 cfs @ 4.55 fps)
Tertiary OutFlowMax =0.00 cfs@ 0.10 hrs HW= 278.76' (Free Discharge)
t-4= Culvert (Passes 0.00 cfs of 7.21 cfs potential flow)
t-3= Broad - Crested Rectangular WektNeir Controls 0.00 cfs @ 0.05 fps)

�Z' r A CT
1 " /HR STORM EVENT
PARKVIEW LEVEL SPREADERS Rainfall Duration =60 min, Inten =1.00 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCAD® 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 2
Summary for Subcatchment 2S: DA -1
Runoff = 2.02 cfs @ 0.09 hrs, Volume= 0.167 af, Depth= 0.40"
Runoff by Rational method, Rise /Fall= 1.0/1.0 xTc, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Rainfall Duration =60 min, Inten =1.00 in /hr
Area (ac) C Description
5.010 0.40
5.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
2.02 cfs
2 1 H�M
0 1
Subcatchment 2S: DA -1
Hydrograph
Rainfall
Duration =60 min,
Inten =1.00 in /hr
Runoff Area =5.010 ac
Runoff Volume =0.167 of
Runoff Depth = 0.40"
Tc =5.0 min
C =0.40
0 1 2
Time (hours)
3
■ Runoff

zM'''rA C--T- 'fA -Z
Le*VrL sV-F£A s
1 " /HR STORM EVENT
PARKVIEW LEVEL SPREADERS Rainfall Duration =60 min, lnten =1.00 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCADO 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 2
Pond 3P: DSB -1
Hydrograph
2.02 cfs
Inflow Area =5.010 ac
Peak Elev= 278.76'
2
1.01 cfs
0 '19
M E R Ur.
0 1 2
Time (hours)
3
■ Inflow
❑ Outflow
■ Primary
❑ Secondary
■ Tertiary

Lcw- L
Q10 STORM EVENT
PARKVIEW LEVEL SPREADERS Q10 Rainfall Duration =60 min, Inten =7.36 in/hr
Prepared by Microsoft Printed 5/25/2015
HydroCADO 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Pape 2
Summary for Subcatchment 2S: DA -1
Runoff = 14.87 cfs @ 0.09 hrs, Volume= 1.229 af, Depth= 2.94"
Runoff by Rational method, Rise /Fall= 1.0/1.0 xTc, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Rainfall Duration =60 min, Inten =7.36 in /hr
Area (ac) C Description
5.010 0.40
5.010 100.00% Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
5.0 Direct Entry,
14.87 cfs
14-
12
42 10
3 $
_o
U. 6
4
2
0
0
1
Subcatchment 2S: DA -1
Hydrograph
Rainfall
Duration =60 min,
Inten =7.36 in /hr
Runoff Area =5.010 ac
Runoff Volume =1.229 of
Runoff Depth= 2.94"
Tc =5.0 min
C =0.40
Time (hours)
2
M
■ Runoff

4 i" its► -Y_- I J-tKEA �= Z
L rwe-L_ �l�i Er2g
Q10 STORM EVENT
PARKVIEW LEVEL SPREADERS Q10 Rainfall Duration =60 min, lnten =7.36 in/hr
Prepared by Microsoft Printed 5/25/2015
HydroCADV 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 1
Summary for Pond 3P: DSB -1
(57] Hint: Peaked at 279.69' (Flood elevation advised)
Inflow Area = 5.010 ac, 0.00% Impervious, Inflow Depth = 2.94"
Inflow = 14.87 cfs @ 0.09 hrs, Volume= 1.229 of
Outflow = 14.87 cfs @ 0.09 hrs, Volume= 1.229 af, Atten= 0% Lag= 0.0 min
Primary = 1.44 cfs @ 0.09 hrs, Volume= 0.125 of
Secondary= 1.44 cfs @ 0.09 hrs, Volume= 0.125 of
Tertiary = 11.99 cfs @ 0.09 hrs, Volume= 0.978 of
Routing by Stor -Ind method, Time Span= 0.00 -3.00 hrs, dt= 0.01 hrs
Peak Elev= 279.69'@ 0.09 hrs
Device Routing Invert Outlet Devices
#1 Primary 277.70' 4.0" W x 4.0" H Vert. Orifice /Grate X 2.000= 0.600
#2 Secondary 277.70' 4.0" W x 4.0" H Vert. Orifice /Grate X 2.000= 0.600
#3 Tertiary 277.70' 24.0" Round Culvert L= 96.0' RCP, groove end projecting, Ke= 0.200
Inlet/ Outlet Invert= 277.70'/ 276.50' S= 0.0125'P Cc= 0.900
n= 0.012, Flow Area= 3.14 sf
#4 Device 3 278.76' 4.3' long Sharp - Crested Rectangular Welt End Contraction(s)
Primary OutFlowMax =1.44 cfs@ 0.09 hrs HW= 279.69' (Free Discharge)
'L1= Orifice /G rate (Orifice Controls 1.44 cfs @ 6.49 fps)
Secondary OutFlowMax =1.44 cfs@ 0.09 hrs HW= 279.69' (Free Discharge)
t-2=Orifice/G rate (Orifice Controls 1.44 cfs @ 6.49 fps)
Tertiary OutFlowMax =11.99 cfs@ 0.09 hrs HW= 279.69' (Free Discharge)
t-3= Culvert (Passes 11.99 cfs of 18.57 cfs potential flow)
t-4= Sharp- Crested Rectangular Wei(Weir Controls 11.99 cfs @ 3.15 fps)

SMPl4CCT (j{Eq b = Z
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Q10 STORM EVENT
PARKVIEW LEVEL SPREADERS Q10 Rainfall Duration =60 min, Inten =7.36 in /hr
Prepared by Microsoft Printed 5/25/2015
HydroCADS 10.00 s/n 05088 © 2011 HydroCAD Software Solutions LLC Page 2
v
3
0
Pond 3P: DSB -1
Hydrograph
0 1 2 3
Time (hours)
■ Inflow
% Outflow
■ Primary
Secondary
® Tertiary

BYPASS CHANNEL
CALCULATIONS

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Page 1 of 2
Tensar International Corporation
5401 St. Wendel - Cynthiana Road
Poseyville, Indiana 47633
Tel. [phone]
Fax [phone]
www.nagreen.com
Erosion Control Materials Design Software
Version 5.0
Project Name: Parkview
Project Number: 68421
Project Location: Clayton, North Carolina
Channel Name: Bypass for Level Spreader #2
Discharge
6.3
Peak Flow Period
3
Channel Slope
0.028
Channel Bottom Width
1.8
Left Side Slope
2.5
Right Side Slope
2.5
Low Flow Liner
Retardance Class
Vegtation Type
N
Vegetation Density
Shear Stress
Soil Type
Sandy Loam
Rock Riprap
Phase
Reach
DisekargeVclocity
Normal
Mannings
Permissible
Calculated
Safety
Remarks
Staple
Depth
N
Shear Stress
Shear Stress
Factor
Pattern
Rock Riprap
Straight
6.3 cfs
3.73
0.54 ft
0.034
2 lbs/ft2
0.94 ibs /ft2
2.13
STABLE
--
Unve etated
ft/s
http : / /www.ecmds.com/print/analysis /68421/68424 5/25/2015

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LEGEND & SUMMARY OF IMPACTS
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PROPOSED ZONE 2 IMPACTS
IMPACT AREA B -1
NEW ZONE 1 3,636 SO FT
NEW ZONE 2 2,395 SO FT
EXISTING STREAM IMPACT (CULVERT) 23 LF
PROPOSED PERMANENT STREAM IMPACT 73 LF
NET INCREASE IN STREAM IMPACT 50 LF
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GENERAL NOTE
_TO'�MGATL 5Y CONTLCII 5TOKMWATEK 50LUTION5; PORTLAND, OR (800) 5 18-4GG7; 5KA,R13OROUGt1, ME [phone],
_IN-idICUM, MD [phone].
�); PRt CA5T M'ANI!Olt= TO L3C CON5TRUCI-C,) IN ACCORDANCL WIT-I� A5TV 0478. DE AIL DRA tVING R1:fLECT5 DE51GN INTENT ONLY,
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WATER QUALITY --
FLOW OUTLET PIPE 5 ! Rt C iL JRr AND ACCE55 COVER5 TO MELT AA5HTO r1-20 LOAD RATING.
`dL t. AND OL;1 LET FFING ' 0 5r 5PEC °IED BY ENGINEER AND PROVIDED 6Y CONTRA,C-OR. °�RECA5T `ORMGATE MAN 1OLE 12°` 24" 3` 3`
(5 E NOTE �} �s - ::�L. PPu.:D NfiTti EiTt k %' COKED OP aNING5 OR lKNOCKOUT, 5 AT INLET AND O,. TLLT LOCATiOt ':.
C 0"�TRAC? OK TO APJU;-)T WFI R 1-0 D'51GN 'ffVAPON 5PECIff('D IN DATA TABLE 15ItLOW ,. 1' r NOT EXCEED 5.O FT-I_55 TORQUE
q.~,EIS TIGtl'-ENING SCBE W5 ON WEIR PRAN'E. ,ffAL WEIR TO FRAME Willi RTV 51LICONE 5E .ANT AFTER J iiNAL ADJU5TMEN
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(5EE NOTE 4) DATA 9,
STRUCTURE iD 5E3-1 EL.240,10 _-..
,r.
WATER QUALITY FLOW ^ .AT ifs} Ca.B t ua, �`g BLIND d�+ALE
PEAK. FLOW ir, Q e r cf} F.3 $ ���� I� w.
( w ,+ � C/L E.L. = 240.10 6" DEEP x 24'LONG LONG x 6'WIDE ±
VARIABLE DIAMETER MANHOLE DIAMETER (4,,`, GO', '72) 48 12 WIDE #57 40 LF % HORIZONTAL
(5EE NOTE E 2) RIM ELEVATION 246.50 O l
4" MIN STONE 3" DEEP
GRADE SLOPE
INLET PIPE
PIPE pATA. E. PIENTATION MATERIAL DIA, ETER NATURAL GRADE EL 240.00 24" CONCRETE SPILL
(5EE NOTE } INi_ET PIPE 24 .5 0 RCP 24' CU (AIF ENTRAINED
® gi 3,000 I 2 DAYS} a .... ......... µ , �k '
WATEP� Qe.3Af_I i ;` _ _,�
2 FLOW OUTLET PIPE 24 ' .5 143.5 CPP G" SECTION
5ET 5CRE'Td5 (TYP) PEAK FLOW 24 ; .5 1800 RCP 24"
STORMGATE MANHOLE - PLAN `/ (5EE NOTE 5) OUTLET PIP FES
INV OUT= 240.4
OR'FICE TYPE (PIPE 'A?, PLATE} r v o� � � ee v es ®r
!�!F'E t r t r I e a [ t t t
EI TIL L VIE ORINCE DIAMETER (1n) �"
W"P CR ST ELfVAT'O�, 242.68co
WEIR. WALL ELEVATION
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W5E at Q eak 243.22 SPLITTER BOX L,= 240.1 r U�1110 LIN SPIAL
WEIR ORIENTATION 151 .4°
I'LOQR r-LCVA[!ON 241 .5
NOTES/5'ECIAL RE wEI ENTS:
PIPE ORIENTATION KEY: T/C EL.® 240.f0 L E TtC EL.� 240.60 (� J� (� I
G/L EL.= 240°10 G1L EL.= 240.10 6-4
24" O FRAME
GRADE RING AND COVER (5 a D) WEIR FRAM t 1 80° O° 24 SPILL CU O% HORIZONTAL GRADE LOPE 44
3' EL.= 240,01} ., . , <, ,.,; EL.= 240.00 0.4
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WEIR PLATE 2700 41
(5EE NOTE E)
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(TYF') LEGEND
T/C= TOP OF CURB SUMMARY IMPACTS
4' fViN � GIL� GUTTED LINE :FILE
NATURAL GRADE UNIFORM—� � � � �
WEIR DETAIL - TION VIEW
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WEIR (5EE DETAIL. 112} � � ! L I ( CHECKED
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EXISTING ZONE 2 IMPACTS
DATE
5/20/15
JO PID.
CONTECFi eta wtr Dlt�trDrt
02006 CONTECH Sto +pater Solutions IMPACT AREA 13m (LEVEL SPREADER BYPASS)
MANHOLEIBYPASS
DRAWING I � T L I L oRAvuo�r � � ZONE 1: 546 SG. F. SHEET
STORMGATE .� r. PLAN AND TION VIEWS T TOP VIEW, I DETAIL, T
ZONE 2; 285 SCS. FT.
STANDARDSTORMWER ,- I STANDARD'T IL,
to tt3 water. ry DATE: m0aiQS CAt E; NE F!t E NAGE: SG-phi"C TL D WN: nAJ� GhlECtCE�: Ait cont tormwater. m FATE: 0 &1041 8 SCALE: NC?NE EiLE hd : S N-CTL C9 : t 1w GMECiCED: ASG