20051533 Ver 1_Complete File_20050913

y ~~F W A rF9p Michael F. Easley, Governor
~Q G William G. Ross Jr., Secretary
r North Carolina Department of Environment and Natural Resources
Alan W. Klimek, P.E. Director
Division of Water Quality

September 13, 2005
DWQ Project # 20051533
Wake County

Topaz Moon, LLC
Attn: C. David Johnson Jr.
5839 Capital Blvd.
Raleigh, NC 27616
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:
Amount Approved nits Plan Location or Reference
Buffers 507 (square 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).
None Carol~'na
at
llCQ
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: httn://h2o.enr.state.nc.us/ncwetlands
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
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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 .0233O 5 is not achieved, then the DWQ shall be notified and
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corrective actions to restore diffuse flow shall be taken if necessary to impede the formation of
erosion gullies
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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
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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
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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 self-monitoring, record keePin
plan, g, g
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t 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
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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,

Q I
i
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

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• Soil & Environmental Consultants, PA
11010 Raven Ridge Road Raleigh, North Carolina 27614 • Phone: [phone] Fax: [phone]
www.SandEC.com
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20051533
August 10, 2005

NCDENR-DWQ D ~~"D V R D
Attn: Ms. C di Karol y Y
AUG 1 n ~QQS
2321 Crabtree Blvd
Parkview Building p.yy~1 .r
Raleigh, NC 27604 w ANdp` ~4'OROPA;,

RE: Buffer Compliance Only (No Check Fee Required For Application) U1, P
Hyundai ofCary
Cary, Wake County, North Carolina
S&EC Project 9320.W1

Dear Ms. Karoly:
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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: Greensboro Office:
236 LePhillip Court, Suite C 3817-E Lawndale Drive
Concord, NC 28025 Greensboro, NC 27455
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]

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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

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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

3. 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 cJwck_here-_

D
II. Applicant Information D
AUG ~ n 2Qa~
1. Owner/Applicant Information DftNMt , WAP~I~ t41 LI PY
Name: Topaz Moon LLC VAMA ~etrn p . A S
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: KMartinASandEC.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
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7. Name of nearest receiving body of water: Williams Creek

8. River Basin: Neuse
(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/.)
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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

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10. Describe the overall project in detail, including the type of equipment to be used:
Construction of an auto dealership ltypical utilizin construction equipment.
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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
open water, and stream channe1
wetlands,
s 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.
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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 Type of Wetland Located within Distance to Area of
100-year Nearest Impact
Site Number Type of Impact (e.g., forested, marsh,
Floodplain Stream (acres)
(indicate on map) herbaceous, bog, etc.)
( es/no) (linear feet)

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, multi 1 length X width, then divide by 43,560.
Stream Impact Perennial or Average Impact Area of
Number Stream Name Type of Impact Intermittent? Stream Width Length Impact
(indicate on ma) Before Impact linear feet) (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 Type of Waterbody Area of
Site Number Name of Waterbody Type of Impact (lake, pond, estuary, sound, bay, Impact
indicate on ma (if applicable)
( p) ocean, etc.) (acres)
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Total Open Water Impact (acres) None
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6. List the cumulative impact to all Waters of the U.S. resulting from the project:
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.
II,

8. 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.

1. 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 feet
) (acreage/linear )
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
(919) 715-0476 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

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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 ?
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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 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.
Zone* Impact Multiplier Required
(square feet) Mitigation
1 352 3 (2 for Catawba) 0
2 155 1.5 0
Total 507 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.
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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
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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
Design.
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XII. Sewage Disposal (required by DWQ)
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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.
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XIII. Violations (required by DWQ)

Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
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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:

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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.

00
Applicant/ gen"signature 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

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AGENT &THORIZATION 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
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Project Name/ Description: -Hyundai of C S&EC Project # 9320.W1
Date: _August 6, 2005

The Department of the Army
U.S. Army Corps of Engineers, Wilmingtdnl 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 & Fnvironmental Consultants, PA to
act in my behalf as my agent in the p~roces.Oing 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 liab" ' and professional courtesy reasons, is valid only for
government officials to enter the ro
p pe ,when accompanied b S& EC , by EC staff. You should tail
SSrEC
to arrange a site meeting prior to visiting) the site.
~ jE
_ ~
C. David Johnson, Jr.
,
Print Property Owner's Name
Pro ZM er' ignature
cc: Ms. Cyndi Karoly cc: Kartin
NC DENR - DWQ
Soil & lJrly
i,ronmental
Consultants PA
2321 Crabtree Boulevard
Raleigh, NC 27604
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Project/: Scale: Figure 1- USGS Map
9320M 1:2000
Pmjed Date: Soil & Environmental Consultants PA
Mqu AC 01120105 Old Raleigh Road
BBM Associates 11010 Raven Ridge Rd.- Raleigh, NC 27614
Cary, Wake County, NC [phone] • [phone]
tyApex Quadrangle Web Page: www.SandEC.com
1993
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Ned 1: Scale:
, Figure 2 -Soil Survey
93NAl 1:1320
Proms nee: Soil & Environmental Consultants PA
Mgr.: AC 01/20105 Old Raleigh Road 11010 Raven Ridge Rd.- Raleigh, NC 27614
1313M Associates
Cary, Wake County, NC [phone] • [phone]
Wake County Soil Survey Web Page: www.SandEC.com
Sheet 66
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08/09/2005 09:47 9198457703 PIEDMONT LAND DESIGN PAGE 02/03
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DWQ Project No.

DIVISION OF WATER QUALITY - 4~1 IXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET

I. PROJECT INFOR TION (please complete foiwing information):
Project Name: / ~40 V
Contact Person: /4,445 Phone Number: (17M) dF5 - 74 06
For projects with multiple basins, specify which bast t is worksheet applies to: N/A
Permanent Pool Elevation 347. ft, (elevation of the orifice invert out)
Temporary Pool Elevation
34 11 I ft, (elevation of the outlet structure invert In
i
i
Permanent Pool Surface Area q.4 '740 1 s q. ~ q. (water surface area at permanent pool elevation)
Drainage Area a Bo ; i ac. (on-site and off-site drainage to the basin)
Impervious Area 2 .'s 7 I T ac. (on-site and off-site drainage to the basin)
ForebaY Surface Area D sq. ft.
(at permanent pool elevation approximately 15%)*
Marsh 0"-9" Surface Area 2 o sq. ft. (at permanent pool elevation approximately 35%)* -3 -3 Marsh 9"-18" Surface Area 1 751: sq, ft. (at permanent pool elevation approximately 35%)*
Micro Pool Surface Area 1,400 sq. ft. (at permanent pool elevation approximately 15%)*
iTemporary Pool Volume 90arm, i cu. ft. (volume detained on top of the permanent pool)
i
SAIDA used 72 i (surface area to drainage area ratio)* 2.77 X E Q `+T)
Diameter of Orifice
in. (draw down orifice diameter) i
I
II. REQUIRED ITEMS CHECKLIST
i ~
Initial in the space provided to indicate the following ' esi n requirements
g g have been met and supporting documentation is attached. If a
requirement has not been met attach an explanatio 01 f why . At a minimum,
a complete stormwater management plan submittal includes
a worksheet for each BMP, design calculations, p a s and specifications showing all SMPs and outlet structure details, a detailed
drainage plan and a fully executed operation and m0 tenance agreement. An incomplete submittal package will result in a request for
additional information and will substantially delay fine! review and approval of the project
AoDlicants Initials j
A r The temporary pool controls runoff from the 1 Inch rain.
The basin side slopes are no i pt~eper than 3:1.
A planting plan for the marsh areas with plant species and densities is provided. j
Vegetation above the permaner pool elevation is specified.
An emergency drain is provid to drain the basin.
The temporary ool draws do
p nI in 2 to 5 days.
io/r Sediment storage i
is provided ~in;the permanent pool, \
00 A sediment disposal area is p ovidad. &#PA * r;+ 49 /S/341- .LP50 10
#4- Access is provided for mainta6ce.
site specific, signed and notarized operation and maintenance agreement is provided.
The drainage area '
r (including any sffsite area) is delineated an a site plan.
Access is provided for mainte ahce.
Plan details for the wetland a Rrovided.
r' Plan details for the inlet and o}u~tlet are provided.
.,Mc
'k A site specific operation
and mainier{ance agreement, signed and notarized by the responsible party Is provided
(see
httpalh2o.ehnr.state,nc.6srncwetlands/oandm.doc).
Pocket Wetlands have different design parameters anal are only assumed to remove 35% TSS - See pp. 19 and 20 of the NC DENR
Stormwater BMP Manual, April 1999.10% open water, 50% high marsh, 40% low marsh.
-
4C IV ?W1 S 14// Z. L 45f )^%606Wd9
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DWQ Project No.

DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET

I. PROJECT INFORMATION (please complete the following information):
Project Name : ~ UA/D Off' G~1/1
Contact Person: N G.~S
Phone Number: f9/~918~[S- 7c o~
Level Spreader ID:
Level Spreader Length ~d ft. er endicular to flow
(P P )
Drainage Area 3. $O ac. on-site and off-site draina a to the lev I r
( g e sp eader *
Impervious Area 57 ac. (on-site and, off-site drainage to the level spreader)*
Maximum Filter Strip/Buffer Slope S , % (6% for forested, leaf littler cover, 8% for thick ground cover)'
grass
Max. Discharge from a 10 Year Storm 20, 2 cfs Ya 15 yPAS S 5 y 57ZA4
Max. Discharge to Level Spreader D. OB cfs
Filter Strip/Buffer Vegetation SS (thick ground cover or grass, canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method GOA/5712 eW 6 W_td f,?E 7 L.9A?O
11. REQUIRED ITEMS CHECKLIS
T
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
draina a Ian and a full
g p y executed operation and maintenance agreement. An incomplete submittal package will result in a request for
additional information and will su n
bsta tially delay final review and approval of the project I~
licants Initials
P/j-' 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 S J ~ 1,0-9.4,06 gjC/Z o^/ ,ron
7
,B A
Y-/~ SS 5 ST,~
Y M
If b ass methods cified in the Draft Level S r a
YP Pe p e der Design Option Document:
QP14 Bypass method is specified (if applicable) and plan details and calculations are provided
/4 Dischar a to levels r
~P g p eader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
~p~f No structures are located in protected buffers. ONby P65 RIP 0.4~ AP/ZoN F~eZ Jy -,09 Ss
Y
RP~~ Plan details for the b ass and outlets are rovided.
YP P S T~'M
i YS
rl~ Theo ration and maintenance r
M ~ cement includes annual erasion 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 rotected buffer areas. In an
P y event the second level spreader cannot be located in Zone 1 of a protected buffer area.
~ - D,t2.~1/N~4G~ To G.E?~L S~/zt.g~~~Z I5 G/L~M ,tZu~/ot/G ~/LoM
Flx e r OX A4i~c/%91_ ~ . A l3 y1~.~fsS s ySr~M s Pn o ?/,DJ5O
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i%~/2 L~4 ~ S y5 TLMS.
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SITE

MaNITY MAP

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PROPOSED BULDM

-6 vi
loo,

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N B. 2 0 100 200 300
A CZ,
SCALE IN FEET

HYUNDAI OF GARY PROJECT: JHMRG
~
Piedmont lndDesigkUP MAGKENAN DRIVE AND OLD RALMOH ROAD DATE: SCALE: I° m = 'JULY Zoos
8522-2N k Fods Road RAeigklodhCmhna 2N15 TeI919145.7600 Fai91 964!03 GARY, NORTH GAROLINA
NORTH DWG. # N$, I

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z -0-
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ZONE IM ACTS / ~ ~ •I
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7
46.25
/ 7 .50
PRO 0 D SANIT
SEWFR SERVICE

30-
10
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don
5 46.25 X12% PCP - _ - - - - - - ~ ~

NE CREEK
BONE 1 IMPACTS -
~NE* TREE PROTECTION FENCE
352 SF W/ SIGNAGE TOWN of CARY NEUSE
/ -
/RIPARIAN BUFFER
l /
o , I 5 ry NO DISTURBANCE ALLOWED IN ZONE 3.
ZONE 1 OF NEUSE BUFFER
EXCEPT FOR STORM OUTLET AT
V 115.
/ / NEW 10' LONG RIGID
0 ELEV. LEVEL SPREADER
I ~ \ 11 / • I/l 11 / I ~ .~~~~Jo ~ /~l 346.35
ZONE 2 IMPACTS
1 /,4 ~ (I r ~ / I NEW STORYWATER 155 SF
WETLANDS ~ -
PERMANENT WATER SURFACE ELEN
F / II = 347.0 (REFER TO DETAILS)
1 / GSF / II
I
11 R i
1 ~ \ \ NEW SILT FENCE
\ \`1 I h OG / / lIll EASEMEN SANfIRAY SEWER
\\11 ~
ONE 2 IMPACTS o 40 80 120
\\\\~cr~~ ,466 SF
SCALE IN FEET
HYUNDAI OF GARY PROJECT: JHMRG
DATE: 0-1 JULY 2005
Piedmont Land Design, LLP MA CKENAN PRI VE AND OLP RALE I &H ROAD
SCALE: I - 40
8522-204 % Forks had RaleigkhrlhCarolina 276(5 Tel [phone] Fax [phone] GARY, NORTH CAROLINA NORTH DWG. # N8. 2

PID Piedmont Land Design, LLP V
8522-204 Six Forks Road • Raleigh, NC 27615 • [phone] • Fax: [phone]

June 20, 2005 ~C
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•9'
Hyundai of Car a L
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16
103 MacKenan Drive
Cary, North Carolina '%9l G1NE
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Stormwater Calculations
Peak Discharge Calculations
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

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CiYil Engineers Landscape Architects Land Planners

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Page 2

Pre-development Nitro en 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
open sace (forest, unmown meadow) 5.05 0.6 3.03
Permanently preserved managed 0.85 1.2 1.02
open sace (grass, landscaping, etc.)
Impervious surfaces
roads, parkin
lots, driveways, roofs, paved storage 0 21.2 0
areas, etc.)
Total 5.90 4.05
Average for Site 0.69
Post-development Nitrogen
L
oadin
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 1.08 0.6 0.65
o ens ace (forest, unmown meadow)
Permanently preserved managed 2.25 1.2 2.70
open sace (grass, landscaping, etc.)
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(1.2) = 55.96 lbs
Reduction (40%) = 55.96(0.40) _ 22.38 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.

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Page 3

Runoff Calculations

Using Rational Method, t, = 5 min I1 = 4.61 in/hr, Ilo = 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
I,
#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

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Page 4

Catch Basin #7
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
#7 - #8
15" rcp @ 1.0%, vio = 3.8 fps, dlo= 0.42', HW/D = 3.36, Qmax = 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%, vlo = 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, Qmax = 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, Qmax = 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

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Page 5

Try 1 1/z" diameter pipe
Average head = 0.90'/2 - 0.0625' = 0.39'
Q = cdA(2gh)os = 0.6(0.0123)(2(32.2)(0.39))o" = 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)°'S = 0.6(0.0123)(2(32.2)(1.44))0.5 = 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%, vto = 1.7 fps, dlo= 0.11', HW/D = 3.35, Q111eJC = 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
Qlo= 0.71(7.50) 3.80 = 20.2 cfs
Qloo= 0.71(9.72) 3.80 = 26.2 cfs

Calculate required weir opening size. Try 4' x 4' box.

QW = Qlo - Max. Pond Outflow (Refer to Detention Calculations)
QW = 20.2 - 4.8 = 15.4 cfs
QW=cWLh",cW=3.0,L= 16'
hlo = 0.47'

QW = Q100 - Max. Pond Outflow (Refer to Detention Calculations)
a QW = 26.2 - 5.0 = 21.2 cfs
QW=cWLh",cW=3.0,L= 16'
hloo= 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
II, Q = cdA(2gh)0' = 0.6(0.196)(2(32.2)(0.95))0" = 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)
j (150 lbs/cf - 62.4 lbs/cf) = 8,045 lbs

Weight of Soil above base = (241f (1' thick) 3.4' high) 100 lbs/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%, vlo = 7.5 fps, dlo=1.4', HW/D = 1.9, Qmax = 45 cfs

Curb Inlet #16
IA = DA = 0.8 acres
Q10= 0.85(7.50) 0.8 = 5.1 cfs

#16 - #17
15" rcp @ 1.5%, vlo = 6.0 fps, d1o= 0.8', HW/D = 3.2, Qm. = 11 cfs

Hydraulic Grade Line Calculations
Use n = 0.012 for rcp per NCDOT Design Guidelines
Calculate friction slopes and full flow velocities
0.67
2
S = / 1.486/n)AR
f (Q ( h )
Vf = Q/A
#1 - #2, Q10 = 2.3 cfs, 15" rcp
S f = 0.0011
Vf= 1.87 fps
#2 - #4, Qlo = 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 Q =2.7cfs 15"rc
P
Sf = 0.0015
Vf= 3.92 fps
#10 - #11, Qio = 7.0 cfs, 15" rcp
Sf = 0.010
Vf= 5.70 fps

#14-#15 =20.2 cfs 30"r
QIO cP
Sf = 0.0021
Vf= 4.11 fps
#16-#17 Qio =5.1cfs 15 rc
p
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'
I
Thickness = 22"
Use Class B erosion control stone

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Page 8

FES #11
d=15",v=9.6fps
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
t 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.
i
i

i

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

i

Ili

DATE

/HYDRAULIC GRADE LINE ~
I.D. NO,PROD. NO. -~t~Mll G SHEET ~ OF ~
DESCRIPTION: l•1~?Qq / c ¢ - f AUNTY W DESIGNED BY.
INLET OR OUTLET f 2 "I CHECKED BY.
JUNCT. NO. W., ELEV. Do 00 Lo HEAD LOSES INLET
RIM
Hf Hc- He H h HE W.S. ELEV, ELEV. REMARKS
S 3449. 5 ~ 24 14 U /Oo p og
CIO
3-4 350, l2 7 3 S2 0,24- L/;,)07 D o9
0.~3 0,4 3 35~ ~ a ~
-4- 350,
1 r6 11 rG 35+.7 of

D. o O o.~o
o, 7 D, 47 354 4 35~
8--35 4 IS'~ 24 o'
0 2- _D
75 5g 4, 15" 1, 102- ;v
tS7 go 5
s
4c FF:

/ 07 _ v

- x

I
CzJ
3 '
SCI 4

6/17/2005

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 6: •,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 = 2.77

Surface Area = 0.11 ac = 4,579 ft'

Min. Forebay Volume = 1,612 cf

(Vol) P.1 = 8,061 cf *Note: See Table Below - P.W.E. 347.00
(VOI)Runoff = 9,086 cf * Note: Design Rainfall - 1 " - @ Elev. 347.90
(VOI)t.Yefl,= 14,844 cf 1-Yr Elev. 349.03
(VOI)Total = 65,569 cf Berm Elev. 351.00

BASIN VOLUME

atA wi suifa e. u.:

sf ,
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)

I

I

CONSTRUCTED WETLAND # 1 DETENTION CALCULATIONS

ON-SITE DRAINAGE AREA TO SYSTEM = DAON = 3.80 ACRES
OFF-SITE DRAINAGE AREA = DAOFF = 0.00 ACRES
DRAINAGE AREA AWAY FROM SYSTEM = DAAWAY = 0.00 ACRES
TOTAL DRAINAGE AREA TO SYSTEM = DA= 3.80 ACRES
HEIGHT OF REMOTE POINT IN WATERSHED ABOVE OUTLET = H = 12 FEET
HYDRAULIC LENGTH OF WATERSHED = L = 500 FEET
COMPOSITE RUNOFF COEFFICIENT AFTER DEVELOPMENT = COSST = 0.71 (68%)
COMPOSITE RUNOFF COEFFICIENT BEFORE DEVELOPMENT = 'CPRE = 0.20
COMPOSITE RUNOFF COEFFICIENT OFF-SITE = COFF = 0.20
COMPOSITE RUNOFF COEFFICIENT (AWAY) = CWWAY = 0.20
SCS CURVE NUMBER AFTER DEVELOPMENT = CN = 86 (68%)

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 'BASED ON EXIST. DA - 3.8 AC
(POST) '(PRE)
Qn = C(IJA = 12.44 CFS Qn = C(IJA = 3.50 CFS

OFF-SITE RUNOFF TO POND
Qn = C(In)A = 0.00 CFS

TOTAL RUNOFF TO POND
(POST) (PRE)
Qn = C(I„)A = 12.44 CFS Qn = C(IJA = 3.50 CFS
RUNOFF AWAY FROM POND
(POST) (PRE)
QAWAY = C(IJA = 0.00 CFS QAWAY = C(IJA = 0.00 CFS

MAXIMUM RELEASE
Qw~, = OPM - AQ81ay = 3.50 CFS

COMPUTE DEPTH OF RUNOFF (0,)

Pn= 3.00 IN 1 YR 24 HR PRECIP CARY, NC

ESTIMATE SOIL STORAGE

S =1000/CN -10 = 1.63 la =.2S = 0.33

Q'= (Pn-0.2S)2/(Pn+0.8S)
Qn- 1.66 IN

JHMRC_Pond1 Detention Away.xls M /T
1-YR DESIGN STORM - 6/17/2005 I'

I

J

CALCULATE TIME TO PEAK

TP = VOLUME/1.39QP = Q'DA/1.39QP

TP = 22.1 MIN

ESTIMATE REQUIRED STORAGE

S= (POST Q-PREQ+AAWAY QT
P
S" = 11,847 CF+25% = 14,808 CF
STAGE STORAGE

0 11,730 347.90 0 0

1.10 14,480 349.0 13,230 14,415

3.10 18,970 351.0 17,898 47,965

Ymp X., W..:

1 -YR STORM ELEV. 349.03
STAGE DISCHARGE QP = 12.44 CFS ( 2) 9 " ORIFICES

K = 2.01
QP = CdA(2gh)os
0 0 0 Cd = 0.6
A = 0.44
1.5 2.00 4.51 g = 32.2
3.5 4.67 7.52 IF HW/D<1, Op K(stage)1-5

5.5 7.33 9.63

7.5 10.00 11.36
9.5 12.67 12.85

1 -YR STORM PEAK = 3.36 CFS

i

JHMRC_Pond1 Detention Away.xls
i
1-YR DESIGN STORM - 611712005 Pilo

CHAINSAW ROUTING TABLE
QP = 12.44 CFS
MAX RELEASE = 3.50 CFS
Tp = 22.1 MIN
dT = 3 MIN
U TIME INFLOW STORAGE STAGE OUTFLOW
(MIN) (CFS) (103 CF) (FT) (CFS)
IS AS
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
i
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 -0.03 14:82 1.13 3.35
19 54 2.3 -0.12 14.70 1.12 3.33
20 J7 1.9 -0.19 < . 14:50 1.11? 3.29
INFLOW CALCULATED USING THE FOLLOWING FORMULAS:
For 0 < I < 1.25 Tp Q= Qp 11 - cos (T-01
2 Tp
For I > 1.25 T Q = 4.34 Op e VTP)1
p p
STORAGE CALCULATED USING THE FOLLOWING FORMULA:
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
111

J1,Mae

05
0
Nitrogen Control Plan
Commercial / Industrial / Residential Sites with Known Impervious Area
I
Project Title: _ A 6~u/(nz "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 ~1A
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 TN export
Area TN export coeff. from use
Type of Land Cover
(acres) (Ibs/ac/yr) (Ibs/yr)
Permanently protected undisturbed open
space (forest, unmown meadow) 5.,05 0.60 3.0 3
Permanently protected managed open space
(grass, landscaping, etc.) 0.85 1.20 1.02.
Impervious Area
O 21.20
O
TOTAL 6j v 4-06
Nitrogen Loading R = 4. (o
ate (Ibs/ac/yr) 9
c. Post-development loading:
TN export
Area TN export coeff. from use
Type of Land Cover (acres) (Ibs/ac/yr) (Ibs/yr)
Permanently protected undisturbed open
S
space (forest, unmown meadow) 09 0.60 to.
Permanently protected managed open space
(grass, landscaping, etc.) 2.25 1.20 :2.-70
Impervious Area .57 21.20 54-40
TOTAL
.9D 57.9%
Nitrogen Loading R 0\11111//q//
ate Ibs/ac/ r ( Y) \\,\~H CAR
Proposed BMP(s) M44 0 !,145TL.4A10 ESS/ • `~y~i
Nitrogen Load after BMPs = . O O'j'~•'~
II Y
Nitrogen Load Offset by Payments = 2.41 s/w/y/L : a SEAL
Net change in on-site N Load = f2. 1 /f elye 20163
Part III. Control of Peak Stormwater Flow (for 1 year, design storm) GINE~
O G
Calculated Pre-development Peak Flow GiS
~ ?nit
Flow Control Method GnKISTI~GIcsXO l~,~TL.~lA/0 A// pXy F.,. rl oh/
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).
2c o
r'~ S
Supply notes & details showing control of Nitrogen and peak stormwater runoff.

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97 d-

DWQ Project No.

DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET

1. PROJECT INFORMATION (please complete the following information):
Project Name : H UA/D Off' G. ,12
y .AZ- y
Contact Person: Phone Number: (9/~9 )B¢S- 7G ov
Level Spreader ID:,
Level Spreader Length ~D ft. (perpendicular to flow)
Drainage Area 3. $O ac. (on-site and off-site drainage to the level spreader) +N
Impervious Area 2.57 ac. n i
s to and off-site drainage
(o to the levelspreader)*
~Fc
Maximum Filter Strip/Buffer Slope S_ / (6% for forested, leaf littler cover, 8% for thick ground cover)
grass
Max. Discharge from a 10 Year Storm 20. 2 cfs 73 j5 ypASS 5 yS7_M
Max. Discharge to Level Spreader 0.'06 cfs
Filter Strip/Buffer Vegetation 612,4<5 (thick ground cover or grass, canopied forest with leaf litter
groundcover)
Pre-treatment or Bypass Method 0A15 719 UG 7rO WE rLAA/o
II. REQUIRED ITEMS CHECKLIST
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
Levelspreader is at least 13 ft. per cf for
p s 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
No structures are located in protected buffers' o~L y s / 2/P-0-4.0 q d~ "A/ A40/7
,By-14-.4 S S 5 y S7W1,f
If bypass methods specified in the Draft Level Spreader Design Option Document:
QP~4 Bypass method is specified (if applicable) and plan details and calculations are provided

P 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. ONX y PES 4 A1^09P AP/zoiv )Q,¢ 5y-/49 ss
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.
- o12A/N.grG~ To LEVY L S.dl1 ~4~~~2 I S wiz ~A4 0"A10 C/G PrzON/
i s pn o ?~v~o
F/n s r v~ /zqi c/fi~9~ ~4 !3 yo~fss s ySTX_:: Al
PvX Z_ 4/ZGE/7 S X5 TAMS.
- en ! Al ,¢G?2E~'M to sh" ~~C GU70t:2 G?r IV' P7` TaWA/O,G G~~ y

PROPOSED BACK OF CURB
3 LF PVC DRAW-DOWN PIPE
PROPOSED RETAINING WALL (EXTEND 6" BELOW P.W.E.)
(TOP VARIES) PROPOSED 4'x4' PRE-CAST BOX #12
(REFER TO DETAIL)
10' WIDE
BERM - 251.0

3:1
349.68 - MAX. 100-YR W.S.E. }
349.03 - MAX. 1-YR W.S.E. CONCRETE ANTI-SEEP COLLAR J
347.90 - 1" RUNOFF W.S.E MIN. 18" AROUND PIPE AND
12" THICK.
347.00- PERMANENT W.S.E.
345.5 - VARIABLE WIDTH BOTTOM 30 LF 12" RCP ® 1.0%
FES #13
INV = 346.35

WETLAND CROSS-SECTION (BOX #12)
NOT TO SCALE

PROPOSED BACK OF CURB

8 LF 6" PVC ® 1.0%
PROPOSED RETAINING WALL (EMERGENCY DRAW-DOWN PIPE W/ VALVE)
(TOP VARIES) PROPOSED 4'x4' PRE-CAST RTCB #14
(REFER TO DETAIL)
10' WIDE
BERM - 251.0
- 3:1 3:1
349.68 - MAX. 100-YR W.S.E. '1
349.03 - MAX. 1-YR W.S.E.
347.90 - 1' RUNOFF W.S.E CONCRETE ANTI-SEEP COLLAR
347.00- PERMANENT W.S.E. MIN. 18" AROUND PIPE AND
12" THICK.
345.5 - VARIABLE WIDTH BOTTOM
34 LF 30" RCP ® 1.0%
FES #15
INV = 345.00

WETLAND CROSS-SECTION (RTCB
#14)
NOT TO SCALE

PROVIDE MANHOLE RING
& COVER PER STD. AREA
INLET DETAIL
350.10 - TOP OF SLAB

349.68 - MAX. 100-YR W.S.E. a
349.03 - MAX. 1-YR W.S.E. a

PROVIDE STEPS PER
347.90 - 1" RUNOFF W.S.E CURB INLET DETAIL
a
346.70 - PERMANENT W.S.E.
1Xz" PVC DRAW-DOWN PIPE
FILL WITH GROUT TO _ INV = 347.00
ELEV. - 346.65
BOTTOM -
ELEV. = 345.65 d
•d~ CONCRETE BASE
12„ RCP OUTLET PIPE d• MIN. 7'L x 7'W x 1' TH
INV = 346.65
112- 16-1 4.00' 16-1 12"
4' x 4' PRE-CAST BOX #12
NOT TO SCALE

PROVIDE MANHOLE RING
& COVER PER STD. AREA
INLET DETAIL
350.10 - TOP OF SLAB
8" OPENINGS
ON ALL 4 SIDES
349.10 - WEIR OPENING
349.68 - MAX. 100-YR W.S.E.
349.03 - MAX. 1-YR W.S.E. 19" 14.5"

a
77
347.90 - 1" RUNOFF W.S.E
PROVIDE 2 - 9" DIAMETER
347.00 - PERMANENT W.S.E. HOLES AT ELEV. - 347.90
s
PROVIDE STEPS PER
6" PVC EMERGENCY • CURB INLET DETAIL
a
DRAW-DOWN PIPE W/
VALVE - INV = 345.42
30" RCP OUTLET PIPE ° CONCRETE BASE
INV = 345.34 _ • MIN. 7'L x 7'W x 1' TH
12" 4.00' 6" 12"
RAISED TOP CATCH BASIN X14
NOT TO SCALE

SPREADER LIP- CONSTRUCT THE LEVEL LIP ON UNDISTURBED SOIL
TO UNIFORM HEIGHT AND ZERO GRADE OVER THE LENGTH OF THE -y-W'Y~'Y~~N~ ~I C
SPREADER. PROTECT IT WITH AN EROSION RESISTANT MATERIAL 1~ -y-
SUCH AS SURGE STONE TO PREVENT EROSION, TO BECOME -y~ '`r N
ESTABLISHED. Y1 Y -y-
W W
OUTLET AREA- THE OUTLET DISPOSAL AREA MUST BE GENERALLY - Y ' -v
SMOOTH AND WELL VEGETATED WITH A MAXIMUM SLOPE OF 10%. Y Y
VEGETATE ALL DISTURBED AREAS -y-
CONSTRUCTION SPECIFICATIONS Y' y- Y u
1. THE MATTING SHOULD BE A MINIMUM OF 4 FEET WIDE -Y"- -y' -y- Y-- y,
EXTENDING 6 INCHES OVER THE LIP AND BURIED 6 INCHES -y- J
DEEP IN A VERTICAL TRENCH ON THE LOWER EDGE.l
THE UPPER EDGE SHOULD BUTT AGAINST SMOOTHLY CUT -y- -y-
SOD AND BE SECURELY HELD IN PLACE WITH CLOSELY Y- -y- LIL STABILIZED
SPACED HEAVY DUTY WIRE STAPLES AT LEAST 12 INCHES LONG. d~-'"mil SLOPE
2. ENSURE THAT THE SPREADER IS LEVEL, FOR UNIFORM SPREADING k11
OF STORM RUNOFF. STABLE
UNDISTURBED kJ&
3. CONSTRUCT THE LEVEL SPREADER ON UNDISTURBED SOIL. Y- OUTLET AREA y' ~I
(NOT ON FILL) Y 4 u&
4 111
i
4. CONSTRUCT A 20 FOOT TRANSITION SECTION FROM THE DIVERSION CHANNEL TO BLEND SMOOTHLY WITH THE WIDTH AND DEPTH OF THE LEVEL SPREADER. .y'- mil' ' ~e .11
5. DISPERSE RUNOFF FROM THE SPREADER ACROSS A PROPERLY hI
STABILIZED SLOPE, NOT TO EXCEED 10%, MAKE SURE THAT -y-
THE SLOPE IS SUFFICIENTLY SMOOTH TO KEEP THE FLOW FROM - 3 ELEVATION POINTS ON
CONCENTRATING. Y- -y- SPREADER ALL AT SAME
6. IMMEDIATELY AFTER IT'S CONSTRUCTION, APPROPRIATELY SEED r ELEVATION (TYPICAL)
AND MULCH THE ENTIRE DISTURBED AREA OF T Y~
HE LEVEL
SPREADER. r
g
d' U rt .
K
1'
I
SURGE STONE LIP
DETAIL No.
STANDARD LEVEL SPREADER 04000.22
EFFECTIVE: 07/01/04
SHEET 1 OF 2