20051533 Ver 1_COMPLETE FILE_20050810

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
September 13, 2005
Topaz Moon, LLC
Attn: C. David Johnson Jr.
5839 Capital Blvd.
Raleigh, NC 27616
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 20051533
Wake County
Subject Property: Hyundai of Cary
Williams Creek [03-04-02, 27-43-2, WSIII, NSW (nutrient sensitive)]
APPROVAL of Neuse River Buffer Rule (15A NCAC 02B .0233) Authorization Certificate
Dear Mr. Johnson:
You have our approval, in accordance with 15A NCAC 02B .0233 and any conditions listed below, to
impact approximately 352 ft2 of Zone 1 and 155 ft2 of Zone 2 of the protected riparian buffers for the
purpose of constructing the stormwater treatment facility outlet at the subject property as described within
your application dated August 10, 2005 and received by the Division of Water Quality on August 10,
2005. In addition, you should obtain or otherwise comply with any other required federal, state or local
permits before you go ahead with your project including (but not limited to) Erosion and Sediment
Control, Non-discharge regulations.
This approval is for the purpose and design that you described in your application. If you change your
project, you must notify us and you may be required to send us a new application. If the property is sold,
the new owner must be given a copy of this authorization and approval letter and is thereby responsible
for complying with all conditions. This approval requires you to follow the conditions listed below.
The Additional Conditions of the Certification are:
1. Impacts Approved
The following impacts are hereby approved as long as all of the other specific and general
conditions of this Certification (or Isolated Wetland Permit) are met. No other impacts are
approved including incidental impacts:
1 ::1 Amount Approved nits Plan Location or Reference
Buffers 507 s uare ft. Ma NB.2
2. Diffuse Flow
An additional condition is that all stormwater shall be directed as diffuse flow at non-erosive
velocities through the protected stream buffers and will not re-concentrate before discharging into
the stream as identified within 15A NCAC 2B .0233(5).
401 Oversight/Express Review Permitting Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: httv://h2o.enr.state.nc.us/ncwetlands
None Caro Ana
?tarally
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
Topaz Moon, LLC
Page 2 of 3
9/13/05
In an effort to comply with the diffuse flow provision of the Buffer Rule (15A NCAC 02B
.0233(5)), you have provided the DWQ with level spreader designs dated August 10, 2005. The
DWQ believes that if implemented, as per these plans, diffuse flow will be achieved. However, if
diffuse flow as per 15A NCAC 02B .0233(5) is not achieved, then the DWQ shall be notified and
corrective actions to restore diffuse flow shall be taken if necessary to impede the formation of
erosion gullies
3. Certificate of Completion
Upon completion of all work approved within this authorization, and any subsequent
modifications, the applicant is required to return the attached certificate of completion to the 401
Oversight/Express Review Permitting Unit, North Carolina Division of Water Quality, 1650 Mail
Service Center, Raleigh, NC, 27699-1650.
4. Protective Fencing
The outside buffer or water boundary and along the construction corridor within these boundaries
approved under this authorization shall be clearly marked with orange warning fencing (or similar
high visibility material) for the areas that have been approved to infringe within the buffer prior to
any land disturbing activities to ensure compliance with 15A NCAC 2B .0233.
5. Grading and Revegetation within Zone 2
The plans provided along with the application depict grading activities within Zone 2 of the
protected buffer. This activity is designated as "exempt" under the Buffer Rule provided that fill is
not placed in Zone 1, diffuse flow is maintained as per the Buffer Rule, the disturbed areas are
stabilized and revegetated, and the health of the existing vegetation in Zone 1 is not compromised.
6. No Impacts to Zone 1
No additional impacts shall occur to Zone 1 of the protected riparian buffers (except for uses and
activities designated as "exempt" within 15A NCAC 02B .0233), unless otherwise approved by the
DWQ.
7. No Impacts Beyond those in Application
No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas
beyond the footprint of the impacts depicted in the Pre-construction Notification. All
construction activities, including the design, installation, operation, and maintenance of sediment
and erosion control Best Management Practices, shall be performed so that no violations of state
water quality standards, statutes, or rules occur.
8. Construction Stormwater Permit NCG010000
Upon the approval of an Erosion and Sedimentation Control Plan issued by the Division of Land
Resources (DLR) or a DLR delegated local erosion and sedimentation control program, an
NPDES General stormwater permit (NCGO10000) administered by DWQ is automatically issued
to the project. This General Permit allows stormwater to be discharged during land disturbing
construction activities as stipulated by conditions in the permit. If your project is covered by this
permit [applicable to construction projects that disturb one (1) or more acres], full compliance
with permit conditions including the sedimentation control plan, self-monitoring, record keeping
Topaz Moon, LLC
Page 3 of 3
9/13/05
and reporting requirements are required. A copy of this permit and monitoring report forms may
be found at http://h2o.enr.state.nc.us/su/Forms Documents.htm.
Any disputes over determinations regarding this Authorization Certificate (associated with the approved
buffer impacts) shall be referred in writing to the Director for a decision. The Director's decision is
subject to review as provided in Articles 3 and 4 of G.S. 150B. This Authorization Certificate shall
expire five (5) years from the date of this letter.
This letter completes the review of the "No Practical Alternatives" determination under 15A NCAC 2B
.0233. If you have any questions or would like a copy of the buffer rules, please call [phone].
This letter does not authorize any impacts to either Waters of the United States or Waters of the State.
Please contact the US Army Corps of Engineers (USACE) or NC Division of Water Quality (DWQ) if
any impacts are proposed to either of these waters.
Sincerely,
Alan W. Klimek, P.E.
AWK/dae
Enclosures: Certificate of Completion
cc: Eric Kulz, DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Kevin Martin-S&EC, 11010 Raven Ridge Road, Raleigh, NC 27614
Filename: 200515 33HyundaiCary(Wake)NBR
NCDENR-DWQ
Attn: Ms. Cyndi Karoly
2321 Crabtree Blvd
Parkview Building
Raleigh, NC 27604
Environmental Consultants, PA
Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone]
www.SandEC.com
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RE: Buffer Compliance Only (No Check Fee Required For Application)
Hyundai ofCary
Cary, Wake County, North Carolina
S&EC Project #: 9320.W1
Dear Ms. Karoly:
On behalf of Topaz Moon LLC, we request written concurrence from the North Carolina
Division of Water Quality that the project complies with the Neuse Buffer Rules for
impacts associated with proposed stormwater utility lines. A Pre-construction
Notification Application (PCN) is attached, which includes an agent authorization form.
On 1/17/05, S&EC conducted a site evaluation of the tract. We determined that two
streams on-site are subject to the buffer rules. The project engineer (Piedmont Land
Design) has designed the stormwater outlet that impacts buffers in accordance with the
10/10/01 DWQ guidance document posted on your website.
The purpose of this project is to construct a commercial project that will meet the demand
for car sales in the area. No wetland or stream impacts are proposed. 0.012 acres of
impacts to Neuse Buffers are proposed for stormwater outlets. The site is approximately
8.5 acres in size and is located north of Hwy 1, south of Hwy 64, east of MacKenan
Road, and south of Old Raleigh Road. Grading in Zone 2 shown on plans for fill slopes
will be re-vegetated and are therefore exempt activities (these are not a part of this
request but are shown for clarity). Please refer to the attached map for the project's
location on a USGS topographic quadrangle.
Charlotte Office:
236 LePhillip Court, Suite C
Concord, NC 28025
Phone: [phone]
Fax: [phone]
Greensboro Office:
3817-E Lawndale Drive
Greensboro, NC 27455
Phone: [phone]
Fax: [phone]
20051533
?l' August 10, 2005
August 10, 2005
S&EC Project #: 9320.W1
Page 2 of 2
Buffer Impacts
The applicant proposes a stormwater utility line that will impact a total of 0.012 acres of
Neuse Buffers. Because there are no stream or wetland impacts associated with the
proposed utility lines, only Buffer Compliance is required for this activity. Similar
projects designed in accordance with the 10/10/01 guidance have been routinely
approved by DWQ.
NC-DWQ's current policy requires written concurrence for stream impacts of greater or
equal to 150 linear feet of stream length per project. There are no wetland impacts and no
stream impacts proposed, however, we require buffer compliance for the project to cover
0.012 acres of impacts to Neuse Buffers. Because there are no impacts to stream
channels and no wetland impacts are proposed, we do not believe that wetland nor stream
mitigation should be required by NC-DWQ. Because this project does not require 401
certification, we do not believe this project requires a DWQ approved stormwater plan.
Details adequate to show that the Neuse Buffer rules are being complied with are
included.
Sincerely,
Kevin Martin
President
Attachments:
Pre-construction (PCN) notification form
Site Location Map-USGS
Site Location Map - Soil Survey
Proposed Buffer Impact Maps (Overall, NB#1, and Inset NB#2)
Agent Authorization Form
Stormwater calculations and plan provided by project engineer
Office Use Only: Form Version March 05
20051533
USACE Action ID No. DWQ No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
1. Check all of the approval(s) requested for this project:
? Section 404 Permit ® Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
? 401 Water Quality Certification ? Express 401 Water Quality Certification
2. Nationwide, Regional or General Permit Number(s) Requested: None
If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here:
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further detail ?ck_here-_?
II. Applicant Information D
AUG ? n 2005
Owner/Applicant Information DUNN . WATER Q TY
Name: Topaz Moon LLC WITLOn?urnp'I?IM A11AO
Mailing Address: Attn: C. David Johnson Jr.
5839 Capital Blvd.
Raleigh, NC 27616
Telephone Number: 919-876-5398 Fax Number:
E-mail Address:
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Kevin Martin
Company Affiliation: Soil & Environmental Consultants, PA
Mailing Address: 11010 Raven Ridge Road
Raleigh, NC 27614
Telephone Number: 919-846-5900 Fax Number: 919-846-9467
E-mail Address: KMartin(,SandEC.com
Page 1 of 8
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name of project: Hyundai of Cary
2. T.I.P. Project Number or State Project Number (NCDOT Only):
3. Property Identification Number (Tax PIN):
4. Location
County: Wake Nearest Town: Cary
Subdivision name (include phase/lot number):
Directions to site (include road numbers/names, landmarks, etc.):. South of Old Raleigh Rd.
and east of MacKenan Road, Cary, NC (see attached USGS map).
5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that
separately lists the coordinates for each crossing of a distinct waterbody.)
Decimal Degrees (6 digits minimum): ON °W
6. Property size (acres):
8.5 acres
7. Name of nearest receiving body of water: Williams Creek
8. River Basin:
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/maps/.)
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: Undeveloped wooded and cutover woodland and
commercial.
Page 2 of 8
10. Describe the overall project in detail, including the type of equipment to be used:
Construction of an auto dealership utilizing typical construction equipment.
11. Explain the purpose of the proposed work: Allow utilization of uplands for an automobile
dealership which complies with local and state stormwater ordinances.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. None
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
None anticipated.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts: Impacts to buffers are required for a
stormwater treatment facility outlet.
Page 3 of 8
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
separately list impacts due to both structure and flooding.
Wetland Impact
Site Number

(indicate on map)
Type of Impact Type of Wetland
(e.g., forested, marsh,

herbaceous, bog, etc.) Located within
100-year
Floodplain

( es/no) Distance to
Nearest
Stream

(linear feet) Area of
Impact
(acres)

Total Wetland Impact (acres) None
3. List the total acreage (estimated) of all existing wetlands on the property: Unknown
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.
Stream Impact
Number
(indicate on ma)
Stream Name
Type of Impact Perennial or
Intermittent? Average
Stream Width
Before Impact Impact
Length
(linear feet) Area of
Impact
(acres)

Total Stream Impact (by length and acreage) None None
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Open Water Impact
Site Number
indicate on ma
(? p) Name

apcablle)
(if applicable)
Type of Impact Type of Waterbody
(lake, pond, estuary, sound, bay,
ocean etc.
) Area of
Impact

(acres)

Total Open Water Impact (acres) None
Page 4 of 8
6. List the cumulative impact to all Waters of the U.S. resulting from the proiect:
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
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USAGE.
Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.):
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.):
Current land use in the vicinity of the pond:
Size of watershed draining to pond: Expected pond surface area:
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts. Impacts to buffers for the
outlet are the only proposed project impacts. All others are avoided or exempt activities
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
Page 5 of 8
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina, available at
http://h2o.enr.state.nc.us/ncwetlands/strmgide.html.
Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
No mitigation should be required.
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of the NCEEP is proposed, please
check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet): 0
Amount of buffer mitigation requested (square feet): 0
Amount of Riparian wetland mitigation requested (acres): 0
Amount of Non-riparian wetland mitigation requested (acres): 0
Amount of Coastal wetland mitigation requested (acres): 0
Page 6 of 8
IX. Environmental Documentation (required by DWQ)
1. Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ? No
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No ?
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Neuse), 15A NCAC 213.0259 (Tar-Pamlico), 15A NCAC 0213.0243 (Catawba) 15A NCAC
2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please
identify V Yes ® No ?
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
I I * Impact Required
Zone t.-- c o Multiplier A TIl
I 1 352 3 (2 for Catawba) 0
2 155 1.5 0
Total I 507 I I 0
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B.0242 or.0244, or.0260. _None required
Page 7 of 8
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss
stormwater controls proposed in order to protect surface waters and wetlands downstream from
the property. If percent impervious surface exceeds 20%, please provide calculations
demonstrating total proposed impervious level. Please see attached plans by Piedmont Land
Desiun.
XII. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Municipal.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application? Yes ? No
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
development, which could impact nearby downstream water quality? Yes ? No
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description:
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
The project engineer has prepared the design consistent with DWQ Draft Stormwater BMP
design criteria.
Applicant/ gents ignature Date
(Agent's signature i only if an authorization letter from the applicant is provided.)
Page 8 of 8
08/09/2005 09:47 9198457703 PIEDMONT LAND DESIGN PAGE 03103
.I
AGENT,,4 TTHORIZATION FORM
All Blanks To BeIn By The Current Landowner
Name: -Topaz Moon, LLC
Address: 5839 Capital Boulevar
-Raleigh, North Carolina 27616 _
Phone: -(919) 876 - 5398
Project Name/ Description: -Hyundai of ' S&EC Project # 9320.W1
Date: _August 6, 2005
The Department of the Army
U.S. Army Corps of Engineers, Wilmingtdn. District
P.O. Box 1890
Wilmington, NC 28402
Attn: ..-Todd Tugwell
Field Office: Raleigh
Re: Wetlands Related Consulting and Pez"tting
To Whom It May Concern-
1, the current roe owner, hereby desWate and authorize Soil & Environmental Consultants, PA to
act in my behalf as my agent in the p?rocesIsing of permit applications, to furnish upon request
supplemental information in support of applications, etc. from this day forward. The day of
This notification supersedes any previous Jcorrespondence concerning the agent for this project.
NOTICE: This authorization, for liabi*,
and professional courtesy reasons, is valid only for
government officials to eater the property hen accompanied by 5&EC staff. You should call S&EC
to arrange a site meeting prior to visitingi the site. ;
_C. David Johnson, Jr.
Print Property Owner's Name
cc: Ms. Cyndi Karoly
NCDENR - DWQ
2321 Crabtree Boulevard
Raleigh, NC 27604
Soil & Envixonmental Consultants, PA

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Project/: Scale: Figure 2 - Soil Survey
83 AI I'M"'
Proms Date: Old Raleigh Road Soil & Environmental Consultants, PA
Mgr.: AC o1120ros BBM Associates 11010 Raven Ridge Rd.- Raleigh, NC 27614
Cary, Wake County, NC [phone] • [phone]
Wake County Soil Survey Web Page: www.SandEC.com
Sheet 66
08/09/2005 09:47 9198457703 PIEDMONT LAND DESIGN PAGE 02/03
DWQ Project
DIVISION OF WATER QUALITY -
I. PROJECT INFOR ATION (please comJj
Project Name:
/ G
Contact Person: Ile-At d
For projects with multiple basins, specify which
DETENTION (and POCKET*) WETLAND WORKSHEET
information):
Phone Nu
worksheet applies to: J
7fG o0
Permanent Pool Elevation 347.01 1 ft. (elevation of the orifice invert out)
Temporary Pool Elevation 34 7. QI 1 ft, (elevation of the outlet structure invert In)

Permanent Pool Surface Area
q.470
? i
1 s q.
q.
(water surface area at permanent pool elevation)
Drainage Area a 190 ; ac.
T (on-site and off-site drainage to the basin)
Impervious Area 2.4 7 I ac. (on-site and of-*site drainage to the basin)
ForebaY Surface Area D sq. ft.
(at permanent pool elevation approximately 151%)*
Marsh 0"4" Surface Area 2 o sq. ft. (at permanent pool elevation approximately 35%)*
Marsh 9"-18" Surface Area 1 75 I sq, ft. (at permanent pool elevation approximately 35%)*
Micro Pool Surface Area 1,400 sq. ft. (at permanent pool elevation approximately 15%)*

Temporary Pool Volume i?
90ara, i
cu. ft.
(volume detained on top of the permanent pool)
II
i i
SAIDA used $. 7Z --L--! (surface area to drainage area ratio)*2.7-7 a E Q`
+7)
Diameter of Orifice 1.5 ; i in. (draw down orifice diameter)
II. REQUIRED ITEMS CHECKLIST
i
Initial in the space provided to indicate the following e i Isign requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explane of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, p ar,s and specifications showing all SMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay fins! review and approval of the project
-WAR r The temporary pool controls
The basin side slopes are no
A planting plan for the marsh
»- Vegetation above the permar
An emergency drain is provid
The temporary pool draws do
Sediment storage is provided
A sediment disposal area is p
Access is provided for mainte
A site specific, signed and no'
The drainage area (including
Z4W I -*'Access is provided for mainte
ooPlan details for the wetland ar
r' Plan details for the inlet and o
A site specific operation and main)
http://h2o.ehnr,state,nc.i
Pocket Wetlands have different design parameters
Stormwater BMP Manual, April 1999.10% open wate
off from the 1 Inch rain,
eper than 3:1.
as with plant species and densities is provided.
pool elevation is specified.
o drain the basin.
in 2 to 5 days,
he permanent pool,
dad, &OWA--S/ r;+ 49 /SA-5-3 44 ALP40 10?
ad operation and maintenance agreement is provided.
offsite area) is delineated on a site plan.
are provided,
ice agreement, signed and notarized by the responsible party Is provided (see
are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
)% high marsh, 40% low marsh.
• . Tf/is WlG c. d? pisb?I Iea?o ?? 7J'?C M-/// cvc
y
DWQ Project No.
1. PROJECTINFOR
Project Name : _
Contact Person: -2
Level Spreader ID: _
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
se complete the followin
rcS
/d ft.
3. fjo ac.
ac.
g information):
Phone Number: (9/?9 )B¢$- 7G oo
(perpendicular to flow)
(on-site and off-site drainage to the level spreader) * 4.
(on-site and, off-site drainage to the level spreader)* *
(6% for forested, leaf littler cover, 8% for thick ground cover)'
Level Spreader Length
Drainage Area
Impervious Area
Maximum Filter Strip/Buffer Slope
grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter Strip/Buffer Vegetation
Pre-treatment or Bypass Method
II. REQUIRED ITEMS CHECKLIST
20, 2 cfs 72> 15 yPA5 S 5 y 57ZA1
0.06 cfs
S5 (thick ground cover or grass, canopied forest with leaf litter
groundcover)
4:: oA/5772 ue- W_t9 WJ5F TL AA/O
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
A.volicants Initials
Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
Pre-Form Scour Holes are on flat slopes only
/Z No structures are located in protected buffers' ONL Y' P£S Q/D-,r2.lP *Cd z o^/ ,ron
,By-/CASs 5 yS7&1-f
If bypass method specified in the Draft Level Spreader Design Option Document:
Q014 Bypass method is specified (if applicable) and plan details and calculations are provided
/Z014 Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
C.00 No structures are located in protected buffers. ONLy P65 4 R/A`04-0 AP/ZoN Are-AZ Jay-'a9 Ss
Plan details for the bypass and outlets are provided. S ysT?'M
rlr The operation and maintenance agreement includes annual erosion and vegetation repair.
# #? fir The operation and maintenance agreement signed and notarized by the responsible party is provided.
Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
- Q,t24 /N.4G6- To L..E05 L 5,0At=.4Ve1Z I5 G/L -M ,CUA10 P /G r- &0-* /
F'//1sr 1" OX A41AA/ Wl-t- . 4 l3y1?.?fSS 5 ySIX5M /S Pn00000
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42
ILG
PID Piedmont Land Design, LLP V
8522-204 Six Forks Road • Raleigh, NC 27615 • [phone] • Fax: [phone]
June 20, 2005
Hyundai of Cary
103 MacKenan Drive
Cary, North Carolina
Stormwater Calculations
Peak Discharge Calculations
\\0 IIIII////
A II
2 OFE .S? • ?
4 L
16
NGINE? • ?
?5\
Ptey'?My N,D
l0/ •???? 5
Using Rational Method, II = 4.61hr; I10 = 7.50 in/hr, Composite c values are based on
c = 0.95 for impervious areas and c = 0.2 for pervious areas. Using HDS No. 3, n = 0.015
for pipe sizing:
Total Site Area = 5.90 acres
Existing Impervious Area = 0 acres
Total Impervious Area after construction = 2.57 acres (44%)
Pre-development Runoff Calculations
Q1=cIA=0.20(4.61)5.90=5.44 cfs
Q10 = 0.20(7.50) 5.90 = 8.85 cfs
Post-development Runoff Calculations
Q1= 0.53(4.61) 5.90 = 14.42 cfs
Q10 = 0.53(7.50) 5.90 = 23.45 cfs
The post-development flows are more than 10% greater than the pre-development flows. Since we
are above this 10% threshold we are required to provide detention. Since we are in a Watershed
Protection Overlay District, constructed wetlands will be required to treat the site, refer to
Constructed Wetlands Calculations.
Nitrogen Runoff Calculations
Site Information
Total Site Area = 5.90 acres
Existing Impervious Area = 0 acres
New Impervious Area = 2.57 acres
Total Pervious Area after Construction = 3.33 acres
Civil Engineers • Landscape Architects • Land Planners
Page 2
Pre-development Nitrogen Loading
Site TN Export TN Export TN Export
Type of Land Cover Area Coeff. By Land Use From Site
(Acres) (lbs/ac/ r (Ibs/ r) (lbs/ac/ r)
Permanently preserved undisturbed
o ens ace (forest, unmown meadow) 5.05 0.6 3.03
Permanently preserved managed

o ens ace (grass, landscaping, etc.) 0.85 1.2 1.02
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage 0 21.2 0
areas, etc.)
Tota[ 4.05
Average for Site ' 0.69
Post-develoment Nitroiien Loading
Site TN Export TN Export TN Export
Type of Land Cover Area Coeff. By Land Use From Site
(Acres) (Ibs/ac/ r (Ibs/ r) (lbs/ac/ r)
Permanently preserved undisturbed

open sace (forest, unmown meadow) 1.08 0.6 0.65
Permanently preserved managed

open sace (grass, landscaping, etc.) 2.25 1.2 2.70
Impervious surfaces (roads, parking
lots, driveways, roofs, paved storage 2.57 21.2 54.48
areas, etc.)
Total 5.90 57.83
Average for Site 9.80
Calculate Nitrogen Removal provided by Constructed Wetlands
DA = 3.80 acres (67.63 % impervious)
TN = 2.57(21.2) + 1.23(l.2) = 55.96 lbs
Reduction (40%) = 55.96(0.40) _ 122.38 lbs
Calculate Nitrogen Loading Rate after BMP
TN = (57.83 - 22.38)/5.90 = 6.01 lbs/acre/year
Calculate Nitrogen Offset Fee
Fee = (6.01 - 3.60)$330(5.90) _ $4,692.27.
No best management practices (BMP's) are required to reduce the total nitrogen export below the
allowable 10.0 Ibs/ac/yr for buy-down for non-residential developments. However, a constructed
wetland, which has an associated nitrogen reduction rate of 40%, has been provided to meet the
requirements of the Watershed Protection Overlay District. A one-time offset payment of $330/lb
is required to bring the nitrogen export down to the acceptable 3.6 lbs/ac/yr. Therefore a payment
of $4,692.27 would have to be paid to the NC Wetlands Restoration Program (WRP). The WRP
will utilize these fees in accordance with the WRP's Basinwide Wetlands and Riparian Restoration
plans. It is the policy of the WRP to utilize the funds where they are generated to the maximum
extent possible as long as they can obtain the cooperation of the local government. The developer
may also chose to use some of he Neuse Buffers as undisturbed open space to further reduce the
nitrogen fees. This will be established prior to the issuance of the grading permit.
Page 3
Runoff Calculations
Using Rational Method, t, = 5 min -> I1 = 4.61 in/hr, llo = 7.50 in/hr; Iloo = 9.72 in/hr
Composite c values are based on c = 0.95 for impervious areas and c = 0.2 for pervious areas. i.e.
(70 % Impervious) --> c = 0.70(0.95) + 0.30(0.20) = 0.73
Using HDS No. 3, n = 0.015 for pipe sizing:
Catch Basin #1
IA = 0.15 acres
DA = 0.15 + 0.21 (RD) = 0.36 acres
QIO= 0.85(7.50) 1.54 = 2.3 cfs
#1 - #2
15" rcp @ 1.0%, vlo = 4.4 fps, dIo = 0.56', HW/D = 2.4, Q. = 9 cfs
Curb Inlet #2
IA = 0.22 acres
DA = 0.22 + 0.17(RD) + 0.36 = 0.75 acres
Qlo = 0.85(7.50) 0.75 = 4.8 cfs
#2-#4
15" rcp @ 2.6%, vlo = 7.7 fps, dIo = 0.65', HW/D =3.92, Qm? = 12 cfs
Double Curb Inlet #3
IA = DA = 1.14 acres
Qlo = 0.85(7.50) 1.14 = 7.3 cfs
#3 - #4
18" rcp @ 1.0%, vlo = 5.8 fps, dIo= 1.05', HW/D = 2.15, Q. = 14 cfs
Curb Inlet #4
IA = 0.30 acres
DA=0.30+0.75+ 1.14=2.19 acres
Qlo = 0.85(7.50) 2.19 = 14.0 cfs
#4-#5
24" rcp @ 1.0%, vlo = 6.9 fps, dIo= 1.2', HW/D = 1.96 effective, Q. = 24 cfs
Catch Basin #6
IA = DA = 0.07 acres
Qlo = 0.85(7.50) 0.07 = 0.5 cfs
#6 - #7
15" rcp @ 1.0%, vlo = 2.9 fps, dIo= 0.25', HW/D = 2.4, Qmax = 9 cfs
Page 4
Catch Basin #7
#7 - #8
IA = 0.04 acres
DA = 0.04 + 0.10(RD) + 0.07 = 0.21 acres
Qio = 0.85(7.50) 0.21 = 1.3 cfs
15" rcp @ 1.0%, vlo = 3.8 fps, dlo= 0.42', HW/D = 3.36, Qma,, = 11.5 cfs
Curb Inlet #8
IA = 0.24 acres
DA = 0.24 + 0.21 = 0.45 acres
Qio = 0.85(7.50) 0.45 = 2.9 cfs
#8-#10
15" rcp @ 9.92%, vio = 11.0 fps, dlo= 0.35', HW/D = 3.30, Qmax = 11.0 cfs
Curb Inlet #9
IA = 0.20 acres
DA = 0.20 + 0.23(RD) = 0.43 acres
Qio = 0.85(7.50) 0.43 = 2.7 cfs
#9-#10
15" rcp @ 2.90%, vlo = 6.7 fps, dio =0.45', HW/D = 2.8, Qma., = 10 cfs
Curb Inlet #10
IA = 0.07 acres
DA = 0.07 + 0.15(RD) + 0.45 + 0.43 = 1.10 acres
Qio = 0.85(7.50) 1.10 = 7.0 cfs
#10 - #11
15" rcp @ 4.0%, vio = 9.6 fps, dio = 0.71', HW/D = 9.42, Qma., = 20 cfs
Junction Box #12
This box is used to drain the 1" rainfall event over a 2 - 5 day period.
Calculate Runoff from 1" Rainfall Event
Rv = 0.05 + 0.0091 = 0.05 + 0.009(67.63) = 0.659"
Volume = Rv(DA) = 0.659"(3.80 acres )(1'/12")(43,560 sf/ 1 acre) = 9,086 cf
Calculate pipe size to drain temporary pool in 2 - 5 days.
Required release rate for drainage in 2 days
Q = (9,086 cf/48 hours)(1 hour/3600 sec) = 0.053 cfs
Required release rate for drainage in 5 days
Q = (9,086 cf/120 hours)(1 hour/3600 sec) = 0.021 cfs
Page 5
Try 11/2" diameter pipe
Average head = 0.90'/2 - 0.0625' = 0.39'
Q = cdA(2gh)o'S = 0.6(0.0123)(2(32.2)(0.39))0" = 0.04 cfs
Use 11/2" drainpipe since it will drain temporary pond in 2 - 5 days.
Calculate Maximum Outflow when Constructed Wetlands is at maximum capacity.
Maximum head = 3.0'/2 - 0.0625' = 1.44'
Q = cdA(2gh)o.s = 0.6(0.0123)(2(32.2)(1.44))05 = 0.077 cfs
Calculate anti-floatation block at 4' x 4' JB
Displacement = 5.00'(5.00') 3.45' tall = 86.25 cf
Buoyant Force = 86.25 cf (62.41bs/cf) = 5,382 lbs. x 1.1 Safety Factor = 5,9201bs.
Weight of walls and base = (181f(0.5' thick)3.45' tall wall + 7.0(7.0) 1.0' thick base)
(1501bs/cf - 62.4 lbs/cf) = 7,012 lbs
Weight of Soil above base = (241f (1' thick) 1.97' high) 100 lbs/cf = 4,728 lbs.
Total weight of walls, base, and soils = 11,740 lbs. which exceeds the buoyant force. This
calculation excludes friction forces of soils, weight of grout, and the top slab, which will
provide an additional factor of safety.
#12- #13
12" rcp @ 1.0%, v10 = 1.7 fps, d10= 0.11', HW/D = 3.35, Q,,. = 7.0 cfs
Raised Top Catch Basin #14
IA = DA = 3.80 acres (67.63% impervious)
Q1= 0.71(4.61) 3.80 = 12.4 cfs
Q10 = 0.71(7.50) 3.80 = 20.2 cfs
Q100 = 0.71(9.72) 3.80 = 26.2 cfs
Calculate required weir opening size. Try 4' x 4' box.
QW = Q10 - Max. Pond Outflow (Refer to Detention Calculations)
QW = 20.2 - 4.8 = 15.4 cfs
QW=cWLh",cW=3.0,L= 16'
h1o = 0.47'
QW = Q1oo - Max. Pond Outflow (Refer to Detention Calculations)
QW=26.2-5.0=21.2 cfs
QW = cWLh3n , cW = 3.0, L = 16'
h100= 0.58', Use 8" opening.
Page 6
Calculate pipe size to drain pool in 24 hours.
Required release rate for drainage in 24 hours
Q = (10,529 cf/24 hours)(1 hour/3600 sec) = 0.12 cfs
Try 6" diameter pipe
Average head = 2.4'/2 - 0.25' = 0.95'
Q = cdA(2gh)0'S = 0.6(0.196)(2(32.2)(0.95))0'S = 0.92 cfs
Use 6" drainpipe since it will drain temporary pond in less than 24 hours.
Calculate anti-floatation block at 4' x 4' RTCB
Displacement = 5.00'(5.00') 4.76' tall = 119.0 cf
Buoyant Force = 119.0 cf (62.41bs/cf) = 7,426 lbs. x 1.1 Safety Factor = 8,168 lbs.
Weight of walls and base = (181f(0.5' thick)4.76' tall wall + 7.0(7.0) 1.0' thick base)
(150 lbs/cf - 62.4 lbs/cf) = 8,045 lbs
Weight of Soil above base = (241f (1' thick) 3.4' high) 1001bs/cf = 8,160 lbs.
Total weight of walls, base, and soils = 16,205 lbs. which exceeds the buoyant force. This
calculation excludes friction forces of soils, weight of grout, and the top slab, which will
provide an additional factor of safety.
#14 - #15
30" rcp @ 1.0%, v10 = 7.5 fps, dio=1.4', HW/D = 1.9, Qm,,, = 45 cfs
Curb Inlet #16
IA = DA = 0.8 acres
Qio= 0.85(7.50) 0.8 = 5.1 cfs
#16 - #17
15" rcp @ 1.5%, vlo = 6.0 fps, dlo= 0.8', HW/D = 3.2, Q.. = 11 cfs
Hydraulic Grade Line Calculations
Use n = 0.012 for rcp per NCDOT Design Guidelines
Calculate friction slopes and full flow velocities
S f = (Q/(1.486/n)ARh0.67)2
Vf = Q/A
#1 - #2, Qio = 2.3 cfs, 15" rcp
S f = 0.0011
Vf= 1.87 fps
#2 - #4, Qio = 4.8 cfs, 15" rcp
S f = 0.0047
Vf= 3.91 fps
Page 7
#3 - #4, Qio = 7.3 cfs, 18" rcp
Sf = 0.0041
Vf=4.13 fps
#4 - #5, Qio = 14.0 cfs, 24" rcp
S f = 0.0033
V f= 4.46 fps
#6 - #7, QIO = 0.5 cfs, 15" rcp
Sf = 0.00005
Vf= 0.40 fps
#7 - #8, Qio = 1.3 cfs, 15" rcp
S f = 0.00034
Vf= 1.06 fps
#8 - #10, Qio = 2.9 cfs, 15" rcp
Sf = 0.0017
Vf= 2.36 fps
#9 - #10, Qio = 2.7 cfs, 15" rcp
Sf = 0.0015
Vf= 3.92 fps
#10 - #11, Qio = 7.0 cfs, 15" rcp
Sf = 0.010
Vf= 5.70 fps
#14 - #15, Qio = 20.2 cfs, 30" rcp
Sf = 0.0021
Vf= 4.11 fps
#16 - #17, Qio = 5.1 cfs, 15" rcp
Sf = 0.0053
Vf= 4.16 fps
Riprap Apron Calculations - Using NYDOT chart
FES #5
d = 24", v = 6.9 fps
Requires Zone 2 light stone filling
L=6xd=12'
W=3xd=6'
Thickness = 22"
Use Class B erosion control stone
Page 8
FES #11
d = 15", v = 9.6 fps
Requires Zone 2 light stone filling
L=6xd=7.5'
W=3xd=3.75'
Thickness = 22"
Use Class B erosion control stone
FES #13
d = 12", v = 1.7 fps
Requires Zone 1 fine stone filling
L=4xd=4'
W=3xd=3'
Thickness = 9"
Use Class A erosion control stone
FES #15
d = 30", v = 7.5 fps
Requires Zone 2 light stone filling
L=6xd= 15'
W=3xd=7.5'
Thickness = 22"
Use Class B erosion control stone
FES #17
d = 15", v = 6.0 fps
Requires Zone 1 fine stone filling
L=4xd=5'
W=3xd=3.75'
Thickness = 9"
Use Class A erosion control stone
Level Spreader Calculations - Using DWQ requirement of 13' of level spreader per cfs of
flow for grassed areas and 100' of level spreader per cfs for forested areas.
FES #13 - maximum flow for 10 year storm - 0.071 cfs
Required Length = 0.071 x 100' = 7.1'
Use 10' minimum length
Erosion and Sedimentation Control Calculations
Temporary Sediment Basin No.1
Drainage area = 3.80 acres
Disturbed Area = 3.80 acres
Q2 = cIA = 0.5(5.76) 3.80 = 10.9 cfs
Qio= cIA = 0.5(7.22) 3.80 = 14.3 cfs
Calculate Minimum Surface Area
Area = 0.01 Q2 = 0.01(10.9) = 0.11 acres = 4,792 sf
Use proposed constructed wetland since it exceeds this surface area.
Page 9
Calculate Minimum Volume
Volume = Drainage Area (1800 cf) = 3.8(1800) = 6,840 cf
Use proposed constructed wetland since it exceeds this volume.
For emergency spillway
Use permanent Raised Top Catch Basin No. 14
JHMRC RPH/rph
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APPENDIX ITEM 12
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Constructed Wetland #1 Calculations
Drainage Area = 3.80 ac
Impervious Area = 2.57 ac
% Impervious Cover = 68 %
Avg. Permanent Pool Depth =
Table 1.1 Surface Area to Drainage Area Ratio For Permanent Pool Sizing For 85% Pollutant Removal
Efficiency in the Piedmont
Impervious <Permanent Pool Depth -feet
Cover. 3 4 .,.`5, •,7 n.; 8 9
10 0.59 0.49 0.43 0.35 0.31 0.29 0.26
20 0.97 0.79 0.70 0.59 0.51 0.46 0.44
30 1.34 1.08 0.97 0.83 0.70 0.64 0.62
40 1.73 1.43 1.25 1.05 0.90 0.82 0.77
50 2.06 1.73 1.50 1.30 1.09 1.00 0.92
60 2.40 2.03 1.71 1.51 1.29 1.18 1.10
70 2.88 2.40 2.07 1.79 1.54 1.35 1.26
80 3.36 2.78 2.38 2.10 1.86 1.60 1.42
90 3.74 3.10 2.66 2.34 2.11 1.83 1.67
Notes: Numbers given in the body of the table are given in percentages.
SA/DA =
Surface Area =
Min. Forebay Volume =
(Vol) P.1 = 8,061 cf
(VOI)RUnoff = 9,086 cf
(VOI)t.Yefl,= 14,844 cf
(V0I)TOt81 = 65,569 cf
BASIN VOLUME
2.77
0.11 ac = 4,579 ftZ
1,612 cf
*Note: See Table Below
* Note: Design Rainfall - 1 "
- P.W.E. 347.00
- @ Elev. 347.90
1-Yr Elev. 349.03
Berm Elev. 351.00
_ ate ?i . Surface u., at`
s,
0 1,970 345.5 0 0
0.5 3,775 346 1,436 1,436
1.5 9,475 347 6,625 8,061
2.5 11,980 348 10,728 18,789
3.5 14,480 349 13,230 32,019
4.5 16,825 350 15,653 47,671
5.5 18,970 351 17,898 65,569
JHMRC_Pondl Wetpond.xls
Wetpond #1 (Away)
CONSTRUCTED WETLAND # 1 DETENTION CALCULATIONS
ON-SITE DRAINAGE AREA TO SYSTEM =
OFF-SITE DRAINAGE AREA =
DRAINAGE AREA AWAY FROM SYSTEM =
TOTAL DRAINAGE AREA TO SYSTEM =
HEIGHT OF REMOTE POINT IN WATERSHED ABOVE OUTLET =
HYDRAULIC LENGTH OF WATERSHED =
COMPOSITE RUNOFF COEFFICIENT AFTER DEVELOPMENT =
COMPOSITE RUNOFF COEFFICIENT BEFORE DEVELOPMENT =
COMPOSITE RUNOFF COEFFICIENT OFF-SITE _
COMPOSITE RUNOFF COEFFICIENT (AWAY) =
SCS CURVE NUMBER AFTER DEVELOPMENT =
ESTIMATE PEAK RUNOFF (OP)
Design Storm = 1 -YR
T, = 3.93 MIN -- USE 5.00 MIN
(In)POST = 4.61 IN/HR
ON-SITE RUNOFF TO POND
(POST)
Qn = C(QA = 12.44 CFS
OFF-SITE RUNOFF TO POND
Qn = C(In)A = 0.00 CFS
TOTAL RUNOFF TO POND
(POST)
Qn = C(I„)A = 12.44 CFS
RUNOFF AWAY FROM POND
(POST)
QAWAY = C(I,,)A = 0.00 CFS
MAXIMUM RELEASE
Qwl,, = QPM - AQ81ay = 3.50 CFS
COMPUTE DEPTH OF RUNOFF (0,*)
Pn= 3.00 IN
ESTIMATE SOIL STORAGE
S =1000/CN -10 = 1.63
Q' = (Pn-0.2S)2/(Pn+0.8S)
Qn' = 1.66 IN
JHMRC_Pond1 Detention Away.xls
1-YR DESIGN STORM - 611712005
'(PRE)
Qn = C(In)A =
(PRE)
Qn = C(In)A =
(PRE)
QAWAY = C(IJA =
1 YR - 24 HR PRECIP
la =.2S = 0.33
DAON = 3.80 ACRES
DAOFF = 0.00 ACRES
DAAWAY = 0.00 ACRES
DA= 3.80 ACRES
H = 12 FEET
L = 500 FEET
CPOST = 0.71 (68%)
*CPRE = 0.20
COFF = 0.20
CAWAY = 0.20
CN = 86 (68%)
'BASED ON EXIST. DA - 3.8 AC
3.50 CFS
3.50 CFS
0.00 CFS
CARY,NC
P
CALCULATE TIME TO PEAK
Tp = VOLUME/1.39QP = Q'DA/1.39QP
TP = 22.1 MIN
ESTIMATE REQUIRED STORAGE
S = (POST Q - PRE Q + A AWAY Q)Tp
S" = 11,847 CF+25% = 14,808 CF
( 2 ) 9 " ORIFICES
K = 2.01
OP = CdA(2gh)os
Cd = 0.6
A = 0.44
g = 32.2
IF HW/D<1, Op = K(stage)1-5
JHMRC_Pond1 Detention Away.xls Pilo
1-YR DESIGN STORM - 611712005
1 -YR STORM ELEV. = 349.03
1 -YR STORM PEAK = 3.36 CFS
CHAINSAW ROUTING TABLE
0, = 12.44 CFS
MAX RELEASE = 3.50 CFS
Tp = 22.1 MIN
dT = 3 MIN
U TIME
(MIN) INFLOW
(CFS) STORAGE
(103 CF)
IS AS STAGE
(FT) OUTFLOW
(CFS)
1 0 0 0 0 0 0
2 3` 0.6 0.00 0 0 0
3 6 2.1 0.10 0.10 0.01 0.02
4 9 4.4 0.38 0.48 0.04 0.11
5 12 7.1 0.78 1.26 0.11 0.30
6 15 9.5 1.22 2.47 0.20 0.56
7 18 11.4 1.61 4,09 0.32 0.91
8 21, 12.4 1,89 5.98 0.46 1.31
9 24 12.2 1.99 7.97 0.61 1.77
10 27, 11.0 1.88 9.85 0.75 2.21
11 30 9.2 1.58 11.43 0.87 2.58
12 33 7.7 1.20" 12.63 0.96 2.86
13 36 6.5 0.88 13.51 1.03 3.06
14 39 r 5.4 0.62 14.13 1.08 3.21
15 42 4.6 0.40 14.53 1.11 3.30
16 '48 3;8 0.23 - 14.76 1.12 3.34
17 48 3.2 0.09 14.84 1.13 3.36
18 51 2.7 ,003 7 14:82 1.13 3.35
19 54 2.3 -0.12 14.70 1.12 3.33
20 ,57 1.9 -0.19 14:50 1.11 3.29
INFLOW CALCULATED USING THE FOLLOWING FORMULAS:
For 0 < I < 1.25 Tp
For I > 1.25 Tp
STORAGE CALCULATED USING THE FOLLOWING FORMULA:
Q = Qp 11 - cos (T-01
2 Tp
Q = 4.34 Op e1.1.30 ( vrv)j
STORAGE _ [INFLOW(cfs) - OUTFLOW(cfs)J ' DTIME(min) ' 60 sec
1 (min)
CONCLUSION: MAXIMUM DISCHARGE FROM THE SYSTEM IS 3.36 CFS (WATER ELEVATION - 349.03)
WHICH IS LESS THAN THE ALLOWABLE DISCHARGE OF 3.5 CFS FOR A 1-YR STORM.
DESIGN IS ACCEPTABLE.
JHMRC_Pond1 Detention Away.xls T
1-YR DESIGN STORM - 611712005 pl,fl
.MmAc
Nitrogen Control Plan Commercial / Industrial / Residential Sites with Known Impervious Area
Project Title: 4:?_412
Part I. Riparian Buffers
Area includes riparian buffers? [ ] No Pflyes ]Exempt
If yes, [ ] 50 foot 1--r/100 foot
River Basin? "euse [ ] Cape Fear
Basis for exemption W-M
Show buffers on site plan.
Part II. Nitrogen Calculations (Method 2, Appendix C):
a. Site Information
Total area of property incl. RAN Gjp
Denuded Area 5. do
Impervious Area incl. R/W 2.677
Managed open space 2.1,
Protected open space /-08
b. Pre-development loading
Type of Land Cover
Permanently protected undisturbed open
space (forest, unmown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
Impervious Area
TOTAL
TN export
Area TN export coeff. from use
(acres) (Ibs/ac/yr) (Ibs/yr)
5.0 5 0.60 3.0 3
0.85 1.20 l- 2
O 21.20 O
5 v .05
Nitrogen Loading Rate (Ibs/ac/yr) = e. 617_
c. Post-development loading:
Type of Land Cover
Permanently protected undisturbed open
space (forest, unmown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
Impervious Area
TOTAL
TN export
Area TN export coeff. from use
(acres) (Ibs/ac/yr) (Ibs/yr)
/.09 0.60 D. co q
2.25 1.20 2.70
• 57 21.20 54. 40
. 90 57.9%
Nitrogen Loading Rate (Ibs/ac/yr) _ 4C> \\\\I CARD/
Proposed BMP(s) J)U4e. b W451'44A/D `?pQ:' ....
Nitrogen Load after BMPs = . O / yet _. ??? O'j'?•'?
Nitrogen Load Offset by Payments, = 2.41 s/w/y/L . a SEA L
Net change in on-site NLoad = 2, 91 1hS1,1e,1 ye 2 016 3 •: ?_
Part III. Control of Peak Stormwater Flow (for 1 year, design storm) GI•NE?
Calculated Pre-development Peak Flow
Flow Control Method 4?97?G/t,7XQ l.,,?TL•?l?t/4? A// OEyJFAlrl DA/
Calculated Post-development Peak Flow 5. 30 G=5
I, th u ersi ne ce ' y to the best of my knowledge that the above information is correct (affix seal).
Supply notes & details showing control of Nitrogen and peak stormwater runoff.

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A S P I AND OLD RALEIGH ROAD
CARY, NORTH CAROLINA
DWQ Project
t. PROJECT INFOR
Project Name : _
Contact Person: 1
Level Spreader ID: _
Level Spreader Length
Drainage Area
Impervious Area
Maximum Filter Strip/Buffer Slope
grass
Max. Discharge from a 10 Year Storm
Max. Discharge to Level Spreader
Filter Strip/Buffer Vegetation
Pre-treatment or Bypass Method
II. REQUIRED ITEMS CHECKLIST
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
complete the following information):
Phone Number: (%" )Z?45- 7G ov
le) ft. (perpendicular to flow)
3, $O ac. (on-site and off-site drainage to the level spreader) +1c
2.57 ac. (on-site and off-site drainage to the level spreader)* ?1Fc
517 % (6% for forested, leaf littler cover, 8% for thick ground cover)'
20.2 cfs 7b j5 yPAS S 5 y 571 M
O, OB cfs
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
G0A15719 uG ,_rd WE 7-LAA/O
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If a
requirement has not been met, attach an explanation of why. At a minimum, a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project.
Applicants Initials
P/1-• Level spreader is at least 13 ft. per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
Pre-Form Scour Holes are on flat slopes only
/1 No structures are located in protected buffers' e>WL,y 21P-0-4.0 q d?Z OA/ ,tbn
oy-lao!vs s ys7wl'f
If bypass method specified in the Draft Level Spreader Design Option Document:
QP?4 Bypass method is specified (if applicable) and plan details and calculations are provided
IZP/-A Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
VA10 No structures are located in protected buffers. ON[ y PES 4 A1^09P AP/Zoiv )9rcAZ 5y-,49 C5
Plan details for the bypass and outlets are provided. 5 ySWA1
rk The operation and maintenance agreement includes annual erosion and vegetation repair.
The operation and maintenance agreement signed and notarized by the responsible party is provided.
Level spreaders in series can be used on slopes of up to 15% in forested areas with leaf littler cover or on slopes of up to 25% in areas
with thick ground cover or grass if designed according to the Draft Level Spreader Design Option Document. This potentially requires a
minor variance in protected buffer areas. In any event the second level spreader cannot be located in Zone 1 of a protected buffer area.
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