20120905 Ver 1_401 Application_20121012

20120905
Soil & Environmental
11010 Raven Ridge Road • Raleigh, North Carolina 27614 -
www.SandEC.com
To: N.C. Division of Water Quality
WebSCaPe Unit
Attn: Karen Higgins
512 N. Salisbury Street -91h floor
Raleigh, NC 27603
From: Nicole Thomson
Soil & Environmental Consultants, P.A.
11010 Raven Ridge Road
Raleigh, NC 27614
Consultants, PA
Phone: [phone] • Fax: [phone]
October 1, 2012
S &EC Project # I I890.PI
Re: Neuse River Buffer Authorization - Trenton Pointe Subdivision, Raleigh, Wake County, NC
On behalf of the Owner, Clifton Woods, LLC (Attn• Mr. Glenn Futrell) please find attached a complete application and
supplemental information requesting Neuse River Riparian Buffer Authorization from the N.C. Division of Water
Quality (DWQ). Please contact me at (919) 846 -5900 if you have any questions or require additional information.
PROJECT SUMMARY
Project Name
Trenton Point Subdivision
Project Type
Residential development
Owner / Applicant
Mr. Glenn Futrell
County
Wake
Nearest Town
Raleigh
Waterbody Name
UT to Reedy Creek
Index Number
27 -33 -8
Class
B; NSW
USGS Cataloging Unit
03020201
IMPACT SUMMARY
Stream Impact (acres).
0
Wetland Impact (acres):
0
Open Water Impact (acres)
0
Total Impact to Waters of the U.S. (acres)
0
Total Stream Impact (linear feet):
0
Total Neuse River Riparian Buffer Impact (square feet)
850 sq. ft. Zone 1 & 358 sq. ft. Zone 2
Attachments
Pre - construction Notification (PCN) Application Form
Agent Authorization Form
USGS Topographic Site Vicinity Map
NRCS Soil Survey Site Vicinity Map
Trenton Pointe Subdivision Stormwater Narrative
Trenton Pointe Subdivision Stormwater Calculations
Impact Maps
R
12o,Z

1VW4 ATE9QG
1� ®�I o Y
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
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
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
-1e.- 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 ❑ 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
® No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑ Yes
® No
1h Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes
® No
2. Project Information
2a. Name of project:
Trenton Pointe Subdivision
2b. County:
Wake
2c. Nearest municipality / town:
Raleigh
2d. Subdivision name:
Trenton Pointe Subdivision
2e. NCDOT only, T.I.P. or state
project no:
N/A
3. Owner Information
3a. Name(s) on Recorded Deed:
Beazer Homes
3b. Deed Book and Page No.
12684/1737
3c. Responsible Party (for LLC if
applicable):
Mr. Patrick Allenl
3d. Street address:
4509 Creedmoor Rd., Ste. 200
3e. City, state, zip:
Raleigh, NC 27612
3f. Telephone no.:
919 - 277 -2406
3g. Fax no.:
N/A
3h. Email address:
N/A
Page 1 of 12
PCN Form — Version 1.3 December 10, 2008 Version

4. Applicant Information (if different from owner)
4a. Applicant is:
❑ Agent ® Other, specify: Applicant is Contract Purchaser as listed on the
Agent Authorization; please copy agent (S &EC) on all correspondence
4b. Name:
Mr. Glenn Futrell
4c. Business name
(if applicable):
Clifton Woods, LLC
4d. Street address:
150 Towerview Ct.
4e. City, state, zip:
Cary, NC 27513
4f. Telephone no.:
919 -612 -5245
4g. Fax no.:
N/A
4h. Email address:
N/A
5. Agent/Consultant Information (if applicable)
5a. Name:
Nicole J. Thomson
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:
NThomson @sandec.com
Page 2 of 12

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
0775641432
1 b. Site coordinates (in decimal degrees):
Latitude: 35.8230 Longitude: - 78.7438
(DD.DDDDDD) (- DD.DDDDDD)
1 c. Property size:
+/- 18 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to
UT to Reedy Creek
proposed project:
2b. Water Quality Classification of nearest receiving water:
B; NSW; 27 -33 -8
2c. River basin:
Neuse River Basin (USGS Cataloging Unit 03020201)
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:
The site is currently forested and is located adjacent to Interstate 40. There are residential properties located east of the
site and SAS campus located to the west of the site.
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:
Approximately 228 LF Please note that the channel start point is located in the north east quadrant of the site where it
then flows in a north - westerly direction off the property.
3d. Explain the purpose of the proposed project:
The proposed site will be developed as a residential subdivision which results in no jurisdictional impacts. However, the
proposed project is required to meet City of Raleigh Stormwater Management requirements and therefore has proposed
several stormwater Best Management Practice (BMP) devices to treat the stormwater generated by this project. As such,
the applicant is requesting approval of the minor amount of Neuse River Riparian Buffer impact associated with the
overflow /bypass channel for this proposed BMP.
3e. Describe the overall project in detail, including the type of equipment to be used:
The site will be developed as a residential subdivision, but the specific project the applicant is requesting approval for
relates to the bypass /overflow channel for the required stormwater device. Equipment typical to stormwater BMP
construction will be used including backhoes, excavators and dump trucks.
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 ❑ No ® Unknown
Comments:
4b. If the Corps made the jurisdictional determination, what type
❑ Preliminary ® Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas?
Agency /Consultant Company- S &EC,PA /USACE
Name (if known)- Steven Ball /Craig Brown
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
Steven Ball (S &EC) met with Mr. Martin Richmond (DWQ) in June 2012 to review the channel features on the site. Mr.
Richmond determined that the feature shown on the attached maps (Feature B) is subject to the Neuse River Riparian
Buffer rules We are not in receipt of Mr Richmond's determination letter as of yet. In July, Steven Ball met with Mr.
Craig Brown (USACE) to confirm the start point of the channel (Feature B). Mr. Brown also confirmed that there are no
other streams or wetlands on the subject property.
Page 3 of 12
PCN Form — Version 1.3 December 10, 2008 Version

B. Project Information and Prior Project History
S. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑ Yes ® No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project?
❑ Yes ® No
6b. If yes, explain.
Page 4 of 12

C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑ Streams - tributaries ® 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.
2b.
2c.
2d.
2e.
2f.
Wetland impact
Type of jurisdiction
number —
Type of impact
Type of wetland
Forested
(Corps - 404, 10
Area of impact
Permanent (P) or
(if known)
DWQ — non -404, other)
(acres)
Temporary T
W1 ❑ P ❑ T
❑ Yes
❑ Corps
❑ No
❑ DWQ
2g. Total wetland impacts
0
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.
3b.
3c.
3d.
3e.
3f.
3g.
Stream impact
Type of impact
Stream name
Perennial
Type of jurisdiction
Average
Impact
number -
(PER) or
(Corps - 404, 10
stream
length
Permanent (P) or
intermittent
DWQ — non -404,
width
(linear
Temporary (T)
(INT)?
other)
(feet)
feet)
S1 ❑ P ❑ T
E] PER
F1 Corps
❑ INT
❑ DWQ
3h. Total stream and tributary impacts
0
31. Comments:
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 —
(if applicable)
Type of impact
Waterbody type
Area of impact (acres)
Permanent (P) or
Temporary T
01 ❑P ❑T
4f. Total open water impacts
0
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, then complete the chart below.
Page 5 of 12
PCN Form — Version 1 3 December 10, 2008 Version

5a.
5b.
5c.
5d.
5e.
Wetland Impacts (acres)
Stream Impacts (feet)
Upland
Pond ID
Proposed use or purpose
(acres)
number
of pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
P1
P2
5f. Total
5g. Comments:
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 DWO)
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.
® Neuse ❑ Tar - Pamlico ❑ Other:
Project is in which protected basin?
❑ Catawba ❑ Randleman
6b.
6c.
6d.
6e.
6f.
6g.
Buffer impact
number—
Reason for
Buffer
Zone 1 impact
Zone 2 impact
Permanent (P) or
impact
Stream name
mitigation
(square feet)
(square feet)
Temporary T
required?
61 ®P ❑ T
Stormwater BMP
Bypass Swale
UT to Reedy Creek
El Yes
® No
850
358
6h. Total buffer impacts
850
358
6i. Comments:
Page 6 of 12

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The proposed site development avoids impacts to the stream located on the property. In fact, in addition to preserving
the Neuse River Riparian buffer, the applicant has set aside an additional tree conservation area that extends beyond the
Neuse Buffer. The riparian buffer impacts requested in this application are solely for the purpose of constructing a
bypass /overflow channel from the stormwater BMP proposed on site. This stormwater BMP is designed to treat the storm
flow that will be generated when this project is completed in compliance with City of Raleigh stormwater requirements,
thereby ultimately improving water quality despite requiring a minimal amount of buffer impact to achieve it.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
The project will meet with the City of Raleigh requirements for Sediment and Erosion Control practices. Tree protection
fencing will be utilized to ensure impacts remain within the permanent swale area as depicted on the impact maps.
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 ® 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
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:
❑ warm ❑ cool ❑cold
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 7 of 12
PCN Form — Version 1.3 December 10, 2008 Version

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 ® 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: The buffer impacts requested are minimal in nature and required solely to construct the bypass /overflow
channel from the proposed stormwater BMPs being built to treat the stormwater generated by this project when
completed. It is our understanding that these impacts are "allowable" per the Table of Uses.
Page 8 of 12

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 F1 No
within one of the NC Riparian Buffer Protection Rules?
1b. If yes, then is a diffuse flow plan included? If no, explain why.
Comments: This project is proposing stormwater BMPs in a series to capture and
treat the stormwater runoff generated by this project upon its completion. The
minor amount of buffer impact requested in this application is associated with the
❑ Yes ® No
bypass /overflow channel for this device. Please see the attached documentation
from the Project Engineer which discusses the types of Stormwater BMPs in detail
and provides the Total Nitrogen (TN) reduction rates.
2. Stormwater Management Plan
2a. What is the overall percent imperviousness of this project?
9.7%
2b. Does this project require a Stormwater Management Plan?
❑ Yes ® No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why:
As this project is not requesting DWQ 401 Approval, the Stormwater condition within the General Certifications does not
apply to this project, and therefore no DWQ Stormwater review is required. However, the City of Raleigh does require
stormwater treatment for the proposed development which is why the applicant has chosen to install several stormwater
BMPs on the property to handle the stormwater run -off generated by this project at its completion.
2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
❑ Certified Local Government
2e. Who will be responsible for the review of the Stormwater Management Plan?
❑ DWQ Stormwater Program
❑ DWQ 401 Unit
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
❑ 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
4a. Which of the following state - implemented stormwater management programs apply
❑ HOW
❑ ORW
(check all that apply):
❑ Session Law 2006 -246
❑ Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
attached?
❑ Yes ❑ No
5. DWQ 401 Unit Stormwater Review
Page 9 of 12
PCN Form — Version 1.3 December 10, 2008 Version

C. Stormwater Management and Diffuse Flow Plan (required by DWQ), continued
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 10 of 12

F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1a. 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)?
1c. 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 ® 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 ED 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.
We have reviewed the "DRAFT Internal Policy, Cumulative impacts and the 401 Water Quality Certification and Isolated
Wetland Programs" document prepared by the NC Division of Water Quality on April 10, 2004, version 2.1. The draft
states that many private development projects, including small residential developments, are unlikely to cause cumulative
impacts. This project does not meet any of the three criteria of private projects that can clearly result in cumulative
impacts. The proposed residential development is relatively small in nature, is within a developed landscape bounded by
existing highway infrastructure and residential developments and therefore, the utility infrastructure (i.e. water and
electricity) are already in place to service the proposed development. We anticipate that you will advise us if a qualitative
or quantitative impact analysis is required.
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.
This project will connect to existing sewer lines. The City of Raleigh will ensure the capacity of their WWTF is not
exceeded.
Page 11 of 12
PCN Form — Version 1.3 December 10, 2008 Version

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
El Yes ®No
impacts?
5c. If yes, indicate the USFWS Field Office you have contacted.
El Raleigh
❑ Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
As this project is only requesting Neuse River Buffer Riparian Authorization, this question is not relevant at this time.
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?
The proposed project is in Raleigh, Wake County which is not near any coastal or tidal habitat that would support EFH
(i.e. salt marshes, oyster reefs, etc.)
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?
As this project is only requesting Neuse River Buffer Riparian Authorization, this question is not relevant at this time.
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?
http: / /floodmaps.nc.gov /fmis /Map.aspx
Nicole J. Thomson
October 1,
2012
Applica A ent's Pii ed Name
Applica ge is i ature
Date
(Agent's signature is valid o aut on letter from the applicant
is nmvi ded.
Page 12 of 12

Environmental Consultants,
Ate, tNTALTMORIT.AIT[ON FORM
Naase:���,` in Ltd cod a l ,�G
address:_ t 5 0 To wary, e— wr Court .
C. Our , N _21513 ,.
Phone: Q 9 %i - 4 35
Project KarnejDcspoption l� .,,� ..,, -C.Saw Pm eec # 1 1 8 q o
Date. 9 :2 2
the Dvartrttettt of riseAmny
U.S. Anny Cogs of Eaganem. Wilmington Disrsicc
P.U. Box 1890
Wli ntington, NC 2840_
At= TA M US L _ T 1 N &I 2 Field OfSce: KAL (tr,J3
Re: Wetlands Related Consulting and Pe_maitting
To %XIhom It Mgy Concern:
I, the curmat wm>2g& .ppw mM hereby designate and autharcize Soil & Entiiammental Consultants. PA to act in
my behalf as my agent in the wedand and stream vedfication process to obtaio fonmal appmval by the L"S.ACE and
.4c DWQ of Soil & Envkownental Consultants, PA vPv&W and stream detaminatic o for the pmpeaty described
herein and in the processing of permit applicannrq to famish upon "gut" rafoUaatxm in st.pposr of
- Mbmaons, etc. fram this day forumd. The �I1 day of i s= � U 1 Z
This notifieatina supersedes any pmvious correspondence concerning theageat for this proitet
NOTICE: This authorization, for liability and professional couttaT reasons, is vaffd ortlg for government
o>lickds to enter the propettf when accompanied by S&BC stafL You shaeild call S&EC to wamige a site
meeting prior to visiting the sine,
It ^r% Fk. +re I1
Print Caatract Purchaser's Name
cc: M. Karen Biggins
NMEI\R -DS4Q WeDSCAP,
Archdale Building
512 N. Sal,sbwy SL. 9L% Floor
la'nleiSkNC 27604
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Contract Pumbare es Sigetaarte
cc: 161m N,mleTho,mon
Soil & Enviroasncntal Consultants PA

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11500.W 1 Topographic Quadrangle
Project Mgr.: 3 103 Trenton Road ' Soil & Environmental. Consultants, PA
SB Clifton Woods, LLC ' 11010 Raven Ridge Rd.- Raleigh, NC 27614
Scale: Wake Co, NC (919)846- 5900•(919)846 -9467
1 " = 2,000' Web Page: www.SandEC.com
6/20! 12 Raleigh West Quad

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Wake Co Soil Survey
G/20/12 Sheet 47

Page 1
Trenton Pointe Subdivision
Stormwater Operations Narrative
This project includes the development of this lot for single family residential subdivision
containing 28 lots and two public streets. The development is located on the west side of
Trenton Road adjacent to Interstate 40 in Raleigh. One underground detention system, a
wet detention pond, a dry detention pond, and a sand filter are being provided to meet the
stormwater runoff control requirements contained in Section 10- 9022 and 9023 of the
City of Raleigh Code. They are designed to reduce the runoff rate after development to
pre - development runoff rates for the 2 -year storm and 10 -year storm and also to reduce
the nitrogen runoff rate to below 6 lbs /acre /year.
Underground Detention System No. 1 is located in the northwest corner of Lot 11. This
system is composed of approximately 316 linear feet of 48" perforated corrugated metal
pipe, gravel storage, and associated structures. It has an approximate storage volume of
6,075 cubic feet. The invert elevation of the pipe is 366.3. The outlet control structure for
the 2 and 10 -year storm is Raised Top Catch Basin No. 36. Structure No. 36 has a 2.5
inch diameter orifice with an invert elevation of 366.30 and a 6 inch diameter orifice with
an invert elevation of 368.60 to reduce the runoff rate to pre - development rates for the 2
and 10 -year storm. A 4 foot wide weir overflow is provided inside the junction box at
elevation 370.30 to convey storms that exceed the design storms. A 15 inch reinforced
concrete pipe is provided from this structure to the discharge point adjacent to the
existing buffer. Maintenance access to the underground detention system is provided
from Trenton Park Lane. The underground detention system is located adjacent to the
street.
Wet Detention Pond No. 1 pond has a permanent pool with a 5.5' depth and surface area
of 6,923 square feet at elevation 358.00. It has a temporary storage volume of 56,354
cubic feet above the permanent pool. The wet pond is approximately 115' long by 100'
wide and is located on the west side of Lot 28. The top of the pond berm is 10' wide at an
elevation of 364. Side slopes on the inside of the main pond embankment are 10:1. Side
slopes on the inside of the forebays are 2:1. The bottom elevation of the main pond is
352.50. The outlet control structure for the 2 and 10 -year storm is Raised Top Catch
Basin No.19. Structure No. 19 has a 2" diameter orifice with an invert in elevation of
358.00, a 10" orifice with an invert elevation of 359.50, a 1.5' wide weir overflow at
elevation 360.50 and a 3.5' wide weir overflow at elevation 362.00 on one side, and a 5'
wide weir overflow at elevation 362.00 on the other 3 sides to reduce the runoff rate to
pre - development rates for the 2 and 10 -year storm. The weir overflow will also convey
storms that exceed the design storms. A 30" reinforced concrete pipe is provided from
this outlet control structure to its discharge point to the existing stream. The pipe
discharges to a 15' long by 9' wide by 18" thick NCDOT Class `B" rip rap apron on
geotextile fabric. Maintenance access to the wet pond is provided from Umstead View

Page 2
Court. A 10' wide grassed berm is provided above and between the retaining walls from
the street to the permanent water surface. Access around the wet pond is provided on the
vegetated shelf. A permanent ladder is not provided on the retaining walls to prevent
people from climbing them. A ladder shall be brought to site to make inspections and
perform maintenance activities in the pond bottom.
Dry Detention Pond No. 1 has a surface area of 7,900 square feet and an approximate
storage volume of 16,600 cubic feet at the weir elevation. The basin is approximately 240
feet long by 50 feet wide and is located on the east side of Lot 28. The top of the pond
berm is 10 foot wide at an elevation of 374.00. Side slopes on the outside of the
embankment are 3:1. Side slopes on the inside of the embankment are 3:1. The bottom
elevation of the pond is 268.50. The outlet control structure for the 2 and 10 -year storm
is Raised Top Catch Basin No. 25. Structure No. 25 has a 12" diameter orifice with an
invert elevation of 368.50 a 4' wide weir overflow at elevation 371.30, 4' wide weir
overflow at elevation 372.40 on the other 3 sides to reduce the runoff rate to pre -
development rates for the 2 and 10 -year storm. The weir overflow will also convey
storms that exceed the design storms. A 24" reinforced concrete pipe is provided from
this outlet control structure to its discharge point to the existing stream. The pipe
discharges to a 12' long by 6' wide by 18" thick NCDOT Class `B" rip rap apron on
geotextile fabric. Maintenance access to the dry pond is provided from Umstead View
Court. A 10' wide grassed berm is provided above the retaining wall on the dam from the
street.
Underground Sand Filter No. 1 is located on the east side of Lot 23. This device has a
sediment chamber and a sand chamber. Each chamber has a surface area of 200 square
feet. The bottom elevation of each chamber is 383.0. The sediment chamber has 2.3 feet
of storage below the weir overflow to the sand chamber. The sand chamber consists of 8
inches of gravel with a 6 -inch perforated pipe, 18 inches of sand, and 60 inches of flood
storage above it. The 6 inch pipe flows to Junction Box No. 9A. A concrete weir is
provided 60 inches above the sand as an emergency overflow in Curb Inlet No. 8 to
bypass flows in excess of the 1" storm. An 18 inch pipe is provided from this curb inlet to
Curb Inlet No. 9 to bypass the flows. Maintenance access to the sand filter is provided
from Trenton Park Lane. The sand filter is located adjacent to the street.
PLD

Piedmont Land Design, LLP
8522 -204 Six Forks Road
(919) 845 -7600 •
August 23, 2012
• Raleigh, NC 27615 •
Fax: [phone]
Trenton Pointe Subdivision
Trenton Road
Raleigh, North Carolina
Stormwater Calculations
Narrative
The site is 18.66 acres and is located in the northwest quadrant of the intersection of Trenton Road
and Interstate 40. This site is wooded and is divided into three drainage basins. Most of the site
currently drains to the north and west. The proposed development includes construction of new
public streets and twenty seven single family homes.
Nitrogen Runoff Calculations
Total Area = 18.66 acres
Existing Impervious Area = 0 acres
New Home Total On -site Impervious Area is unknown, therefore use Figure 3 -2 to calculate
Nitrogen Export from Lots — Refer to Appendix B.
Dwelling units per acre = 27 lots /14.33 acres = 1.88
TN Export Coeff. = 3.4 lbs /ac /yr
Use Figure 3 -2 to calculate Nitrogen Export from internal street right of way (2.32 acres) — Refer to
Appendix B.
71 % impervious
TN Export Coeff. = 13.5 lbs /ac /yr
Total On -site Impervious Area on Lot 28 after Construction = 0.10 acres maximum
Total On -site Pervious Area on Lot 28 after Construction = 1.91 acres
Additional Impervious Area in adjoining Public R/W = 0.09 acres
Additional Landscaped Area in adjoining Public R/W = 0.55 acres
Civil Engineers • Landscape Architects • Land Planners
Site
TN Export
TN Export
TN Export
Type of Land Cover
Area
Coeff.
By Land Use
From Site
(Acres)
(lbs /ac/ r
(lbs /yr)
(lbs /ac/ r-)
Permanently preserved undisturbed
open space (forest, unmown meadow)
0.00
0.6
0.00
Permanently preserved managed
open space (grass, landscaping, etc.)
2.46
1.2
2.95
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage
0.19
21.2
4.03
areas, etc.)
Lots 1
14.33 1
3.4
48.72
Civil Engineers • Landscape Architects • Land Planners

Page 2
Right of way
2.32
13_.5
31.32
Total
19.30
87._02
Average for Site
4.51
Since the nitrogen export load is less than the allowable export for buy -down (6 lbs /ac /yr), no
nitrogen reduction measures are required, however a wet detention pond and a sand filter has been
provided to meet the Neuse Buffer requirements.
Nitrogen Reduction by Stormwater BMP's
Sand Filter No. 1
Drainage Area = 1.96 acres (0.64 acres impervious)
Total Nitrogen = 1.32 (1.2) + 0.64 (21.2) = 15.15 lbs
Nitrogen Reduction = 0.35(15.15) =15.30 lbs
Wet Detention Pond No. 1
Drainage Area = 9.54 acres (3.30 acres impervious)
Total Nitrogen = 6.24 (1.2) + 3.30 (21.2) - 5.30 (Sand Filter J) = 72.15 lbs
Nitrogen Reduction = 0.25(72.15) = 118.04 lbs
Total Nitrogen Removal = 5.30 + 18.04 = 23.34 lbs /year
Total Nitrogen Export after reductions = 87.02 - 23.34 = 63.68 lbs /year
Average Nitrogen Export leaving the site = 63.68/19.30 = 3.30 lbs /acres /year
Required Payment
Since the resultant Total Average Nitrogen Export is less than the maximum acceptable loading
rate of 3.6 lbs /ac /yr, a one -time offset payment is not required.
Calculate Percentage Nitrogen Reduction at Wet Detention Pond Discharge
Sand Filter's Drainage Area is treated by the Wet Detention Pond also.
TN Removal = 35% + 25% - 0.35(25 %) = 51.25% for its drainage area.
Wet Detention TN Removal = 25%
Total Percentage of Nitrogen Reduction based on wet pond drainage area =
[51.25 %(1.96 acres) + 25 %(7.58 acres)] /9.54 acres = 30.39%
PLD

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150 TOWERVIEW COURT
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PIEDMONT LAND DESIGN, LLP
8522 -204 SIX FORKS ROAD
RALEIGH, NORTH CAROLINA 27615
919.845.7600 PHONE
919.845.7703 FAX
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