20090395 Ver 1_401 Application_20090409

='AMACTEC
engineering and constructing a better tomorrow
April 9, 2009
NCDENR
Division of Water Quality
401 Oversight/Express Unit
2321 Crabtree Boulevard
Suite 250
Raleigh, North Carolina 27604
Subject: LETTER OF TRANSMITTAL
41
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cy
090395 PAID
Pre-Construction Notification Application
Proposed Clayton Parkway
Clayton, North Carolina
MACTEC Project 6470-08-2258
On behalf of the Town of Clayton, please find the attached Pre-Construction Notification Application for
the Proposed Clayton Parkway project in Clayton, North Carolina.
Should you have any question or require additional information, please contact Jeff Mann at (919) 831-
8066.
Sincerely,
MACTEC ENGINEERING AND CONSULTING, INC.
. lo,?_
Je nn, P.E.
C i E weer
Enclosures: PCN Application (7 copies)
MACTEC Engineering and Consulting, Inc.
3301 Atlantic Avenue • Raleigh, NC 37604 • Phone: [phone] • Fax: [phone]
www.mactec.com
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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.0 November 2008
Pre-Construction Notif 8fition (PCN) Form
A. Applicant Information
1. Processing
1a. Type(s) of approval sought from the
Corps:
®Section 404 Permit El Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 14 or General Permit (GP) number:
1 c. Has the NWP or GP number been verified by the Corps? ® Yes ? No
1d. Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification - Regular ? Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ® Riparian Buffer Authorization
1 e. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes ® No For the record only for Corps Permit:

? Yes ® No
If. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ® Yes ? No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below. ? Yes ® No
1h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
2. Project Information
2a. Name of project: Clayton Parkway
2b. County: Johnston
2c. Nearest municipality / town: Clayton
2d. Subdivision name: N/A
2e. NCDOT only, T.I.P. or state
project no: N/A
3. Owner Information
3a. Name on Recorded Deed: James B. Hunt (Estate of)
3b. Deed Book and Page No. Book No. 0509 and Page No. 0031
3c. Responsible Party (for LLC if
applicable): c/o Robert B. Hunt
3d. Street address: 1441 NC 42 East
3e. City, state, zip: Clayton, NC 27527
3f. Telephone no.:
3g. Fax no.:
3h. Email address:
Page 1 of 14
PCN Form - Version 1.0 November 2008 Version
Section A. Applicant Information, continued
4. Applicant Information (if different from owner)
4a. Applicant is: ? Agent ® Other, specify: Municipality
4b. Name: Steve Biggs, Town Manager
4c. Business name
(if applicable): City of Clayton
4d. Street address: 111 E. Second Street
4e. City, state, zip: Clayton, North Carolina 27520
4f. Telephone no.: [phone]
4g. Fax no.:
4h. Email address: [e-mail]
5. Agent/Consultant Information (if applicable)
5a. Name: Mr. James Cutler
5b. Business name
(if applicable): MACTEC Engineering and Consulting, Inc. (MACTEC)
5c. Street address: 7347 West Friendly Avenue, Suite E
5d. City, state, zip: Greensboro, NC 27410
5e. Telephone no.: [phone]
5f. Fax no.: [phone]
5g. Email address: [e-mail]
Page 2 of 14
PCN Form - November 2008 Version
B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): 167900-10-0758
1 b. Site coordinates (in decimal degrees): 35.646974'N - 78.423758'W
1 c. Property size: 256.62 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to
proposed project: Neuse River (flows to Pamlico Sound)
2b. Water Quality Classification of nearest receiving water: WS-IV; NSW
2c. River basin: Neuse (USGS 8-Digit Cataloging Unit No. 03020201)
Page 3 of 14
PCN Form - Version 1.0 November 2008 Version
B. Project Information and Prior Project History
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
The project site includes the first section of the proposed Clayton Parkway and the proposed Caterpillar Core PDC
facility. This proposed section of the Clayton Parkway comprises approximately 6.72 acres and is bounded by Highway
42 on the south and mixed pine-hardwood upland forest on the west, east, and north. The Bayer Research Laboratory
facilities extend along a portion of the southwestern boundary of the project site. A private drive extends through the
southern portion of the site. The origin of this road occurs at the intersection of NC Highway 42 and Glen Laurel Road
(SR 1902). The majority of the parkway site is mixed pine-hardwood upland forest. A jurisdictional perennial stream
channel (S1) extends (southwest to northeast) through the parkway portion of the project site. Four, small, wetland
floodplain areas (bottomland hardwood forest) abut the perennial stream channel, outside the extents of the proposed
construction area. A second stream channel extends through the northern portion of the proposed parkway. However,
the portion of the stream reach which occurs on-site (within the project boundaries) is non-jurisdictional (ephemeral).
The proposed Caterpilar Core PDC comprises approximately 294.90 acres and is bounded by pine-hardwood upland
forest on the north, south and west, and by the Neuse River on the east. The majority of the Caterpillar site is mixed
pine-hardwood upland forest. Four, jurisdictional, intermittent stream channels (SA, SB, SC and SD) have been identified
on the Caterpillar site, which are located adjacent to areas of proposed development. However, the proposed
development will not impact these channels or associated buffers. There are additional jurisdictional perenniel and
intermittent stream channels are located along the northern and western property boundaries, respectively. However,
these channels are a significant distance from the proposed development.
Values of elevation on the subject site range from approximately 314 to 140 feet above mean sea level. Surface water
runoff generally is to the northeast to the Neuse River. Figure 4 (attached herein) depicts the location of the existing
property on the U.S. Geological Survey (USGS) topographic quadrangle map (Clayton, NC). Figure 2 (attached herein)
presents the Natural Resources Conservation Service (NRCS) soil map units that occur within the existing property, as
presented on an aerial photograph background (2005 imagery). The existing property boundary which is depicted on
Figures 1 and 3 represents the boundary of the area of investigation for the Jurisdictional Determination for the proposed
Clayton Parkway project. The location of the on-site, U.S. Army Corps of Engineers (USACE) jurisdictional surface
waters, i.e., the limits of the perennial and intermittent stream channels which occur within the project site are presented
on the specific purpose survey. Note: The permit applicant requests that the Notification of Jurisdictional Determination
for the proposed Clayton Parkway project be made a part of the Nationwide Permit 14 (issued permit). Information on
current site conditions is also provided in the April 2, 2009 stormwater report for the proposed project (Stormwater
Narrative and Supporting Calculations) (attached herein), which was prepared by McKim & Creed, PA for the Town of
Clayton.
3b. List the total estimated acreage of all existing wetlands on the property:
Total wetland acreage within proposed construction area = 0.00 ac.
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
Total stream linear feet = 297 ft., as solely comprised of Stream S1 (perennial).
3d. Explain the purpose of the proposed project:
The purpose of the proposed Clayton Parkway project is two fold. The first phase on the project will involve the
construction of a two-lane roadway (Clayton Parkway) to provide access from Highway 42 East to a proposed Caterpillar
site, which is currently land locked. The second phase of the project will involve the construction of the Caterpillar Core
PDC facility and associated service road to connect to the Clayton Parkway (Drawing OP-1).
Page 4 of 14
PCN Form - November 2008 Version
B. Project Information and Prior Project History
3e. Describe the overall project in detail, including the type of equipment to be used:
The proposed Clayton Parkway project, as described in Section 3d, involves the construction of a two-lane roadway to
provided access to the proposed Caterpillar Core PDC. This section of the proposed Clayton Parkway will be constructed
per NCDOT engineering standards, but is not a NCDOT directed project. The roadway portion of the project will entail
the backfilling of 297 ft. (296.58 ft.) of a jurisdictional, perennial stream channel (Stream No. S1) for placement of a 60-
inch diameter reinforced concrete pipe (RCP) and fill material for construction of the roadway. No dredge or fill impacts
are proposed for the four, jurisdictional floodplain wetlands located outside the proposed construction area. Likewise, the
four, intermittent stream channels located on the Caterpillar site will not be impacted by the proposed Caterpillar Core
PDC. Heavy construction equipment including track excavators, bulldozers, pans, rubber tired tractors, paving machines
and/or dump trucks are anticipated for the proposed construction activities. Coordination with the prime contractor
regarding implementation of construction methodologies that further minimize permitted impacts to jurisdictional surface
waters will be evaluated where feasible. The site development plan and other pertinent drawings for the proposed
Clayton Parkway project are included herein. Drawing No. DA-MAP is the project drainage area map. Drawing No. C-1
is a drawing of the existing site conditions. The proposed segment of impact of Stream No. S1 (perennial surface water)
is presented on Drawing C-2. The profile and cross section of the proposed 60-inch diameter, reinforced concrete
culvert, along with the associated inlet and outlet cross sections, are presented on Drawing No. PP-1. The grading plan
for the proposed project is presented in Drawing CG-101. Finally, the design details for the proposed bioretention cell
(BMP #1 details) are presented in Drawing CG-102.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property / ® Yes ? No ? Unknown
project (including all prior phases) in the past?
4b. If the Corps made the jurisdictional determination, what type ? Preliminary ® Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company:
Name (if known): Mr. Chad Coggins and Mr. Byron Bateman Other: NC Department of Transportation
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
A request for Notification of Jurisdictional Determination was submitted to Mr. Thomas Brown of the Raleigh regulatory
field office of the USACE on September 24, 2008 by MACTEC. A request to review the project for applicability under the
Neuse River Riparian Buffer Rule was provided to Mr. Martin Richmond of the Raleigh office of the North Carolina
Department of Environment and Natural Resources (DENR), Division of Water Quality (DWQ) on September 24, 2008.
On September 30th and November 18th, 2008, site inspections were conducted by Mr. Brown to confirm the landward
limits of USACE regulatory jurisdiction ("Waters of the U.S.") on the proposed Clayton Parkway and Caterpillar Core PDC
site, respectively. The site inspections were also attended by Mr. Richmond, who determined project applicability under
the Neuse River Riparian Buffer Rule. The Notification of Jurisdictional Determination for the project has not been issued
by the USACE at this time. The binding Jurisdictional Determination will be made a part of the Nationwide Permit 14 for
this project, at the time of issuance of the permit by the USACE. Mr. Richmond provided correspondence, dated
November 5, 2008 and January 12, 2009, which presented the results of the review of the project under the Neuse River
Riparian Buffer Rule. Copies of the November 5, 2008 and January 12, 2009 DWQ correspondence are attached herein.
5. Project History
5a. Have permits or certifications been requested or obtained for ? Yes ® No ? Unknown
this project (including all prior phases) in the past?
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project? ? Yes ® No
6b. If yes, explain.
Page 5 of 14
PCN Form - November 2008 Version
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
? Wetlands ® Streams - tributaries ® Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number - Type of Type of wetland Forested (Corps - 404, 10 Area of impact (acres)
Permanent (P) or impact (if known) DWQ - non-404, other)
Temporary T
W1 ? P ? T ? Yes ? No ? Corps
? DWQ
W2 ? P ? T ? Yes ? No ? Corps
? DWQ
W3 ? P ? T ? Yes ? No ? Corps
? DWQ
W4 ? PEI T ? Yes ? No ? Corps
? DWQ
W5 ? P ? T ? Yes ? No ? Corps
? DWQ
W6 ? PEI T ? Yes ? No ? Corps
? DWQ
2g. Total wetland impacts
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f.
Stream impact Type of Stream name Perennial (PER) or Average stream width (feet) Impact
number - impact intermittent (INT)? length
Permanent (P) or (linear feet)
Temporary (T)
S1 ®P ? T Fill and
Culvert UT to Neuse
River ® PER ? INT Five 297
S2 ? P ? T ? PER ? INT
S3 ? P ? T ? PER ? INT
S4 ? P ? T ? PER ? INT
S5 ?P?T ?PER ?INT
S6 ?P?T ?PER ?INT
3g. Total stream and tributary impacts 297
3h. Comments: S1 is identified as Perennial Stream on Drawing C-2 (Stream Impact - Clayton Parkway Culvert Crossing).
Page 6 of 14
PCN Form - Version 1.0 November 2008 Version
C. Proposed Impacts Inventory, continued
4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individual) list all o en water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of
impact number waterbody Type of impact Waterbody type Area of impact (acres)
- Permanent (if
(P) or applicable)
Temporary T
01 ?P?T °
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts
4g. Comments:
Page 7 of 14
PCN Form - November 2008 Version
C. Proposed Impacts Inventory, continued
5. Pond or Lake Construction
If and or lake construction pro osed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or (acres)
number purpose of pond
Flooded Filled Excavated Flooded Filled Excavated Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
? Yes ? No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If an impacts require mitigation, then ou MUST fill out Section D of this form.
6a.
® Neuse ? Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number - Reason Buffer Zone 1 impact (square Zone 2 impact
Permanent (P) for impact Stream name mitigation feet) (square feet)
or Temporary required?
131 ®P ? T Road
Crossing UT to Neuse River ® Yes ? No 17,755 11,814
B2 ?P?T ?Yes ?No
B3 ? P ? T ? Yes ? No
6h. Total buffer impacts 17,755 11,814
6i. Comments: The grading plan (Drawing CG-101) for the proposed Clayton Parkway site includes the limits of the Zone 1
and Zone 2 buffer area impacts.
Page 8 of 14
PCN Form - November 2008 Version
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1 a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The proposed Clayton Parkway portion of the project will involve the backfilling of 297 ft. of jurisdictional, perennial stream
channel (Stream No. S1) for placement of a 60-inch diameter, reinforced concrete culver and fill material during
construction of the roadway. No dredge or fill impacts are proposed for the four, jurisdictional floodplain wetlands located
outside the construction area. The roadway alignment was configured to minimized stream impacts while following the
current site topograph and to avoid impacts to existing wetland areas. The project was modified to reduce the
disturbance to Stream No. S1, from an initial impact of nearly 364 linear feet to the current proposed impact of 297 linear
feet. Complete avoidance of this perennial channel is not feasible, based on the alignment of the proposed parkway and
the existing topography of the site. Therefore, the proposed culvert (297 linear feet of stream impact) is required to
provide access to the Caterpillar site.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Coordination with the prime contractor regarding implementation of construction methodologies that further minimize
permitted impacts to jurisdictional surface waters will be evaluated where feasible. A preconstruction meeting, including
the prime contractor, USACE, DENR and MACTEC, will be conducted to formally establish the limits of proposed
impacts, as the impacts only slightly less than the 300-foot permit threshold.
Sediment/erosion control best management measures have been incorporated into the design of the proposed project.
An Erosion and Sediment Control Plan (ESCP) has been submitted to the Land Quality Section of DENR for review and
approval. This plan describes the best management practices (BMPs) related to sediment and erosion control, as well as
stormwater management.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for ® Yes ? No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ® DWQ ® Corps
® Mitigation bank
2c. If yes, which mitigation option will be used for this ? Payment to in-lieu fee program
project?
? Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank: Forest Creek Mitigation Bank
Type Stream
3b. Credits Purchased (attach receipt and letter) Mitigation Unit Quantity 594
(SMU)
Page 9 of 14
PCN Form - Version 1.0 November 2008 Version
D. Impact Justification and Mitigation, continued
3c. Comments: A copy of correspondence (electronic mail), dated December 17, 2008, from Mr. Matt Fisher of the Forest
Creek Mitigation Bank is attached herein. This correspondence presents the price quote for purchase of Stream Mitigation
Units for the proposed Clayton Parkway project, along with details of the mitigation credit purchase process and the required
documentation. A formal letter of acceptance, documenting the agreement to supply stream mitigation credits for this project,
with be forthcoming from EarthMark.
4. Complete if Making a Payment to In-lieu Fee Program
4a. Approval letter from in-lieu fee program is attached. ® Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: warm, cool, cold
4d. Buffer mitigation requested (DWQ only): square feet
4e. Riparian wetland mitigation requested: acres
4f. Non-riparian wetland mitigation requested: acres
4g. Coastal (tidal) wetland mitigation requested: acres
4h.. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation? ® Yes ? No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone Reason for impact Total impact
(square feet) Multiplier Required mitigation
(square feet)
Zone 1 Road Crossing 17,755 3 (2 for Catawba) 53,265
Zone 2 Road Crossing 11,814 1.5 17,721
Total buffer mitigation required: 70,986
6c. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in-lieu fee fund).
Purchase of buffer credits from the Forest Creek Mitigation Bank.
6d. Comments: A copy of correspondence (electronic mail), dated December 17, 2008, from Mr. Matt Fisher of the Forest
Creek Mitigation Bank is attached herein. This correspondence presents the price quote for purchase of Riparian Buffer
Mitigation for the proposed Clayton Parkway project, along with details of the mitigation credit purchase process and the
required documentation. A formal letter of acceptance, documenting the agreement to supply buffer mitigation credits for
this project, with be forthcoming from EarthMark.
Page 10 of 14
PCN Form - November 2008 Version
E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1a. Does the project include or is it adjacent to protected riparian buffers identified ® Yes ? No
within one of the NC Riparian Buffer Protection Rules?
1 b. If yes, then is a diffuse flow plan included? ® Yes ? No
2. Determination if the Project Requires a Stormwater Management Plan
2a. Does the project require a Non-404 Jurisdictional General Permit? ? Yes ® No
2b. Is the project subject to General Certification 3704 or 3705? ? Yes ® No
3. Determination of Stormwater Review Jurisdiction
3a. Is this project subject to any of the following state-implemented stormwater ? Coastal counties
management programs (check all that apply)? ? HQW
? ORW
If so, attach one copy of the approval letter from the DWQ and one copy of the ? Session Law 2006-246
approved stormwater management plan. ? Other:
3b. In which local government's jurisdiction is this project? Town of Clayton
3c. Is this local government certified to implement a state stormwater program? ? Yes ® No
If so, attach one copy of the approval letter from the local government and one copy
of the approved stormwater management plan (or one copy of the approved
Stormwater management plan stamped as approved).
4. Information Required for DWQ 401 Unit Stormwater Review
4a. What is the overall percent imperviousness according to the most current site plan? 2.09% BUA
4b. Does this project contain any areas that meet the criteria for "high density" per ? Yes ® No
General Certifications 3704 and 3705?
4c. If the site is over 24% impervious and/or contains high density areas, then provide a brief narrative description of the
stormwater management plan.
Note: The proposed site construction does not exceed 24% impervious, nor does it contain high density areas. The
following response is provided for informational purposes only.
The existing impervious area is approximately 0.00 acres, or 0.00% of the total area of the project site (256.62 acres).
The proposed impervious area for the Clayton Parkway is 1.14 acres, or 0.44% of the total site. The appropriate pollution
abatement, stormwater attenuation, and flood control measures for the Clayton Parkway portion of the project will be
provided pursuant to the stormwater management criteria of the DWQ. Best Management Practices (BMPs) including,
but not limited to, filter cloths, silt dams, traps, barriers, or appurtenances at the foot of the sloped surface will ensure that
sedimentation pollution will either be eliminated or maintained within acceptable limits as established by the DWQ. The
details of the stormwater management plan for the proposed Clayton Parkway project are presented in the Stormwater
Management Permit Application Form prepared by McKim & Creed, PA. A copy of the application is attached.
The proposed impervious area for the Caterpillar Core PDC facility, including the access drive, is 4.23 acres, or 1.65% of
the total site. The appropriate pollution abatement, stormwater attenuation, and flood control measures for the Caterpillar
Core PDC portion of the project will be provided pursuant to the stormwater management criteria of Johnston County.
Best Management Practices (BMPs) including, but not limited to, filter cloths, silt dams, traps, barriers, or appurtenances
at the foot of the sloped surface will ensure that sedimentation pollution will either be eliminated or maintained within
acceptable limits as established by Johnston County.
4d. Has a completed BMP Supplement Form with all required items been submitted ? Yes ® No
for each stormwater BMP?
Page 11 of 14
PCN Form - Version 1.0 November 2008 Version
F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal/state/local) funds or the ® Yes ? No
use of public (federal/state) land?
1 b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ? Yes ® No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.) ? Yes ? No
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ? Yes ® No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after-the-fact permit application? ? Yes ® No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in ? Yes ® No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
A sanitary sewer service will be provided by the Town of Clayton to serve the proposed Caterpillar site.
Page 12 of 14
PCN Form - Version 1.0 November 2008 Version
F. Supplementary Information, continued
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or ? Yes No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act ® Yes ? No
impacts?

5c. If yes, indicate the USFWS Field Office you have contacted.
Raleigh
®
? Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
The project study area was evaluated in August 2008 by the NCDOT to determine the potential habitat (potential for
occurrence) for federally listed threatened or endangered (T&E) species known to have ranges extending into Johnston
County. The U.S. Fish and Wildlife Service (USFWS) lists five species with federal protection that have a range
extending into Johnston County. These five species include: red-cockaded woodpecker (Picoides borealis); tar
spinymussel (Elliptio stienstansana); dwarf wedgemussel (Alasmidonta heterodon); Michaux's sumac (Rhus michauxii);
and bald eagle (Haliaeetus leucocephalus). Based on the results of the NCDOT evaluation and/or additional on-site
reconnaissance conducted by MACTEC biologists in 2008, it is presumed that there would be No Effect to individuals or
populations of red-cockaded woodpecker, Michauxii's sumac, or bald eagle from the proposed development activities.
Suitable habitat is either not present, or is marginally present but not abundant, for these species. The NCDOT and
MACTEC did not observe the red-cockaded woodpecker or the bald eagle, or their sign, during the site reconnaissance.
Suitable habitat for the Michaux's sumac is not present within the project study area due to the overall density of the
forest canopy; i.e., this species typically thrives in disturbed open areas. The NCDOT also visually inspected the stream
banks of the perennial channel (Stream No. S1), but did not observe individuals of tar spinymussel or dwarf
wedgemussel.
Preferred habitat for Dwarf wedgemussel (Alasmidonta heterodon) is generally associated with large rivers and small
streams with mixed substrates. This bivalve prefers streams situated in a predominantly-wooded landscape with intact
riparian buffers and good water quality. The stream in the project corridor is situated in a wooded landscape near the
stream origin. The baseflow channel within is approximately 18-24 inches wide and the substrate is comprised of sand.
The stream in the project does not provide suitable habitat for this species and therefore is unlikely to support populations
of Dwarf wedgemussel.
Preferred habitat for Tar spinymussel (Elliptio steinstansana) is generally associated with relatively fast-flowing, well
oxygenated water in streams with substrate comprised of relatively slt-free, uncompacted gravel/coarse sand. This
species has had a restricted distribution and is endemic to the Tar River drainage basin. The stream in the project
corridor is situated in a wooded landscape near the stream origin. The baseflow channel within is approximately 18-24
inches wide and the substrate is comprised of sand. The stream in the project corridor does not provide suitable habitat
for this species and therefore is unlikely to support populations of Tar spinymussel.
North Carolina Natural Heritage Program records do not document occurrences of any of the five species within 2.0 miles
of the project corridor.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? E] Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
The South Atlantic Fishery Management website was accessed by MACTEC, as well as the interactive viewer "South
Atlantic Habitat and Ecosystem IMS," to determine if Essential Fish Habitat encompassed the proposed project area. Based
upon the search of these source databases, it appears that the proposed project area does not include Essential Fish Habitat.
Page 13 of 14
PCN Form - November 2008 Version
F. Supplementary Information, continued
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation ? Yes ® No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
The NC State Historic Preservation Office (SHPO) website was accessed (Department of Cultural Resources
Office of
,
Archives and History) and a review of the document "NC Listings in the National Register of Historic Places by County
(As of October 22, 2008)" was made. Based on the listing for Johnston County, it appears that there are no historically
listed sites which would encompass the proposed project area.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain? ? Yes ® No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination? FEMA FIRM 37101 00095 D Dated October 20, 2000
Tower 74 C\cq-'tQv%
lh? CA S

?fl?? V11cww?e.? 4??
y -3-OCY
Applicant/Agent's Printed Name Applicant/Agent' e
(Agent's signature is valid only if an authorization letter from the applicant Date
is rovided.
Page 14 of 14
PCN Form - November 2008 Version
lex
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Source: Johnston County GIS, 2008
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AMACTEC SITE VICINITY MAP
CLAYTON PARKWAY
CLAYTON, NORTH CAROLINA
6470082229.02
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SITE CATION/SURROUNDING PROPERTIES
OMACTECCLAYTON PARKWAY PROJECT
CLAYTON. NORTH CAROLINA
PREP,TD DATE CHECK D D.�9a,T JOB NUMBER 6470082229.02
By 4iA�pq _ H4 A 9 6470082229.02 4

STORMWATER NARRATIVE
AND
SUPPORTING CALCULATIONS
CLAYTON PARKWAY
Town of Clayton, Johnston County, North Carolina
April 2, 2009
Prepared for:
Town of Clayton, North Carolina
Prepared By:
McKim & Creed, PA
1730 Varsity Drive
Raleigh, North Carolina 27606
Phone: [phone]
Fax: [phone]
M&C Project No. 01517-0193
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G1 C.)
PROJECT DESCRIPITON
The purpose of the project is to construct the first phase of the Clayton Parkway. The roadway
will extend approximately 1,600 If from the intersection of Glen Laurel Road, toward the
northwest. The paved section will culminate at a proposed gravel drive that will be used to
access the Product Development Center Caterpillar.
SITE DESCRIPTION
The existing site is a 160' Right of Way extending to the North from the intersection of NC 42 and
Glen Laurel Road. The total project boundary is approximately 5.86 acres. The total disturbed
acreage for the project site is 8.18 acres.
The tract has elevations ranging from 315' above Mean Sea Level (MSL) in to 225' MSL and
includes the crossing of an unnamed tributary to the Neuse River.
The average slope over the site is around 7%, however several localized areas have existing
grades in excess of 15%,
SOILS
According to the Johnston County Generalized Soil Survey, the majority of uplands within the site
are classified as Cecil sandy loam (Ce) and Pacolet loam (Pa). Interspersed are small pockets
of Urdorthents loamy. Along the banks of the Neuse River are the frequently flooded Wahadkee
loam (Wt) and Chewacla loam (Ch). The following soil descriptions are associated with the soils
found on the site:
CeB - Cecil sandy loam at 2 to 6% slopes
NoB - Norfolk loamy sand at 2 to 6% slopes
PaD - Pacolet loam at 10 to 15%
PaE - Pacolet loam at 15 to 25%
Ud - Urdorthents loamy
STORMWATER IMPROVEMENTS
This project will provide stormwater management based on the guidelines set forth in the North
Carolina Division of Water Quality's Stormwater Best Management Practices Manual.
Based solely on impervious areas in relation to the site acreage, the project can be classified as
low density according to the "BMP Manual" in that the total impervious area for the site is less
than 24%:
46,149sf * 100% =15.77%
292,694sf
Furthermore, each individual drainage area of the site can be classified as low density (See
attached SWU-101 Drainage Areas breakdown), particularly due to the large amount of offsite
drainage that finds its way to the site.
However, since we are impacting a jurisdictional stream within the Neuse River Basin, Neuse
Buffer Rules require that any new stormwater conveyed through the buffer must be treated for
the reduction of Nitrogen.
To determine an overall stormwater management strategy for the project, we first broke the
project into 3 drainage basins that represent the overall drainage patterns for the site. For each
drainage area, we determined a point of analysis to which the entire area drains. Each point of
analysis corresponds with the drainage area of the some number.
Our findings have concluded that:
A. For Drainage Area # 1, we are concentrating flow and creating a new conveyance
through the Neuse River buffer. Based on the DWQ's guidelines, we would either
need to diffuse flow or treat the stormwater for Nitrogen removal. Due to site
constraints, diffuse flow would be unattainable. Therefore, a bioretention area will be
provided to treat runoff in this drainage area.
B. For Drainage Area #2, based on the large amount of offsite drainage conveyed in
the stream and the small amount of impervious introduced on the West side of the
stream crossing, no treatment will be needed. The impervious percentage for this
drainage area is only 1.66%
C. For Drainage Area #3, we are able to provide diffuse flow from the pavement info
the buffer as the site topography allows us not to install a swale to convey stormwater
on the northeastern quadrant of the stream crossing.
D. The roadway impervious surface for the Clayton Parkway comprises only 2.81 % of the
total drainage area effected by the project.
MAINTENANCE CONSIDERATIONS
The property owner shall be responsible for periodic inspection and maintenance of all
permanent indicated stormwater devices. Any measure that tails to function as intended shall
be repaired immediately.
CALCULATIONS
Calculations are included in this package.
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Prepared by McKim & Creed, PA
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Subcatchment 4S: (new Subcat)
[46] Hint; Tc=O (Instant runoff pear depends on dt)
Runoff - 5.43 cfs @ 11.90 hrs, Volume= 0.203 af, Depth> 0.58"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Type li 24-hr Rainfall=2.89"
Area (sf CN Description
182,468 70 Woods, Good, HSG C
182,468 Pervious Area
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Prepared by McKim & Creed, PA
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Pond 2P: (new Pond)
Inflow Area = 5.407 ac, Inflow Depth > 0.80"
Inflow = 9.88 cfs @ 11.90 hrs, Volume= 0.362 of
Outflow = 5.00 cfs @ 11.96 hrs, Volume= 0.359 af, Atten= 49%, Lag= 3.9 min
Primary - 5.00 cfs @ 11.96 hrs, Volume= 0.359 of
Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of
Routing by Stor-Ind method, Time Span= 5.00-20.00 hrs, dt= 0.05 hrs
Peak Elev= 254.14'@ 11.97 hrs Surf.Area= 3,012 sf Storage= 3,036 cf
Plug-Flow detention time= 9.3 min calculated for 0.358 of (99% of inflow)
Center-of-Mass det. time= 6.7 min ( 813.0 - 806.4 )
Volume Invert Avail Storage Storage Description
#1 253.00' 9,800 cf Custom Stage Data (Prismatic) Listed below (Recalc)
Elevation Surf.Area Inc.Store Cum.Store
_ (feet) (sq-ft) (cubic-feet) (cubic-feet)
253.00 2,321 0 0
254.00 2,920 2,621 2,621
255.00 3,575 3,248 5,868
256.00 4,288 3,932 9,800
Device Routing Invert Outlet Devices
#1 Primary 248.00' 24.0" x 63.0' long Culvert RCP, square edge headwall, Ke= 0.500
Outlet invert= 247,00' S= 0.0159T Cc= 0.900 n= 0.013
#2 Device 1 253.00' 4.00' W x 0.25' H Vert. Orifice/Grate C=0.600
#3 Device 1 254.10' 4.00' x 4.00' Horiz. Orifice/Grate Limited to weir flow C=0.600
#4 Secondary 254.50' 10.0' long x 6.0' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00
2.50 3.00 3.50 4.00 4.50 5.00 5.50
Coef. (English) 2.37 2.51 2.70 2.68 2.68 2.67 2.65 2.65 2.65
2,65 2.66 2.66 2.67 2.69 2.72 2.76 2.83
Primary OutFlow Max=4.86 cfs @ 11.96 hrs HW=254.11' (Free Discharge)
t-1=Culvert (Passes 4.86 cfs of 34.20 cfs potential flow)
2=orifice/Grate (Orifice Controls 4.78 cfs @ 4.78 fps)
T__3=0rifice/Grate (Weir Controls 0.08 cfs @ 0.37 fps)
Secondary OutFlow Max=0.00 cfs @ 5.00 hrs HW=253.00' (Free Discharge)
t-4=Broad-Crested Rectangular Weir ( Controls 0.00 cfs)
BIO-RETENTION AREA DESIGN
Town of Clayton Parkway
Bioretention Area
Project: 1517-0192
Prepared by: CCA
Date: 4/ 1 /2009
Drainage area: 182,468 sf
Impervious area: 15.022 sf
Volume to Catch The First 1.0 Inch of Runoff:
Runoff : Rv = 0.05 + 0.9 * la Simple Method. Schueler
la (ac/ac)= 0.082
Rv = 0.124
Volume: V = 3630 * P * Rv * A
P = 1.00 in
Rv = 0,124
A = 4,19 ac
V = ,887 cf
Surface Area: SA = Volume / Depth
Depth = 12 in
SA = 1,887 sf
Select Fill Soil:
Soil Conductivity (k)
(in 1 hr)
Sand 6
Loamy Sand 2
Sandy Loam 0.5 - 1
Clay Soils: Use Sandy Loam or Loamy Sand
Fill Soil = Sandy Loam
k=
Town of Clayton Parkway Page 2 of 2
Find Time Drawdown of Dater Throu h Biro-Retention coil Layer
A. Rate of Drawdown: Qd = (2.3e-5) * k * SA * H / L H / L Approximatley = 1
Qd= 4.4434 cfs
B. Find Time to Drawdown Water from inundation to Saturation at Surface:
Volume to Drawdown: Vi-s = SA *Depth
Vi-s = 1,887 cf
Time to Remove Volume of Water at Flowrate Qd:
Ti-s = Vi-s / Qd = 43,478 sec.
12 hr.
C. Find Time to Drawdown Water from Saturation at Surface to 2 feet Below Surface:
Porosity (n) = 4.45
Volume to Drawdown: Vi-s = 2 feet * SA * n
Vs-2 = 1.698 cf
Time to Remove Volume of Water at Flowrate Qd:
Ts-2 = Vs-2 / Qd = 39,134 sec.
11 hrs
D. Total Time to Draw Mater Through Soil:
T= 23 hrs
Town of Clayton Parkway Page 3 of 3
Sizing Underdrain Pipes and GraveLtEnvelope
Note: Underdrain pipes are to be used when existing soil is clay.
N x D = 16 (Qd *n / s ^0.5)^(3/8
N (Numbr of Underdrain Pipes )
D (Pipe Diameter) = 4 in
s (Internal Slope of Pipe) = 0.50%
n (Mannings Roughness Coefficient) - 0.011
NXD= 5,82
N = 1.46
2 Pipes
Pipe Type and Diameter Manning Roughness Coeff.
4" Single Wall Corrugated Plastic 0.014 - 0.015
4" Smooth Wall Plastic 0.010 - 0.011
6" Single Wall Corrugated Plastic 0.014 - 0.015
6" Smooth Wall Plastic 0.010 - 0,011
8" Single Wall Corrugated Plastic 0.015 - 0.016
Gravel Envelope: Underdrain pipe should have 2 inches gravel cover.
The minimum depth for the gravel envelope should be 6 inches.
Depth = 6 in
DWQ USE ONLY
Date Received Fee Paid Permit Number
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual, etc. who owns the project):
Town of Clayton North Carolina
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Steve Biggs Town Manager
3. Mailing Address for person listed in item 2 above:
111 E. Second Street
City:Clayton State:NC Zip:27520
Phone: [phone] Fax: ( )
Email:sbiggsQtownofclaytonnc.org
4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans,
specifications, letters, operation and maintenance agreements, etc.):
Clayton Parkway
5. Location of Project (street address):
At the intersection of NC-42 and SR 1902 (Glen Laurel Road) in Clayton, NC
City:Clayton County1ohnston Zip:
6. Directions to project (from nearest major intersection):
At the intersection of NC-42 and SR 1902 (Glen Laurel Road) in Clayton, NC
7. Latitude:350 38' 40" N Longitude:78° 25' 23" W of project
8. Contact person who can answer questions about the project:
Name:Gareth Avant El Telephone Number: (919 ) 233-8091
Email:[e-mail]
II, PERMIT INFORMATION:
1. Specify whether project is (check one): NNew ?Renewal ?Modification
Form SWU-101 Version 09.25.08 Page 1 of4
2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit numberN/A and its issue date (if known)
3. Specify the type of project (check one):
®Low Density ?High Density ?Redevelop ?General Permit ?Universal SMP ?Other
4. Additional Project Requirements (check applicable blanks; information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
?CAMA Major ®Sedimentation/Erosion Control ?404/401 Permit ?NPDES Industrial Stormwater
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
Stormwater for the project will be conveyed in grass swales and pipes into the existing creek. In one location,
stormwater will be captured and treated in a bioretention area.
2. Stormwater runoff from this project drains to the Neuse River basin.
3. Total Property Area: 6.72 acres 4. Total Coastal Wetlands Area: N/A acres
5. Total Property Area (3) - Total Coastal Wetlands Area (4) = Total Project Area**:6.72 acres
6. (Total Impervious Area / Total Project Area) X 100 = Project Built Upon Area (BUA):15.77 %
7. How many drainage areas does the project have?3
8. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
For hich density proiects, complete the table with one drainage area for each engineered stormwater device.
Basin Information Drainage Area 1 Drainage Area 2
Receiving Stream Name See attached See attached
Stream Class & Index No.
Total Drainage Area (so
On-site Drainage Area (so
Off-site Drainage Area (so
Existing Impervious* Area (so
Proposed Impervious*Area (so
% Impervious* Area (total)
Impervious* Surface Area Drainage Area 1 Drainage Area 2
On-site Buildings (so
On-site Streets (so
On-site Parking (sf)
On-site Sidewalks (so
Other on-site (so
Off-site (so
Total (so:
" hupervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas,
sidewalks, gravel areas, etc.
**Total project area shall be calculated to exclude Coastal Wetlands from use when calculating the built upon area
percentage calculation. This is the area used to calculate overall percent project built upon area (BUA).
Farm SWU-101 Version 09.25.08 Page 2 of 4
9. How was the off-site impervious area listed above derived?GIS Topography brought into CAD and outlined.
Projects in Union County: Contact the DWQ Central Office staff to check to see if you project is located
within a Threatened & Endangered Species watershed that niay be subject to more stringent storinivater
requirements.
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
One of the following property restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number, size and the allowable built-upon area for each lot must be provided as an attachment.
Forms can be downloaded from httj2://h2o.enr.state.nc.us/su/bmp forms.htm - deed restrictions.
Form DRPC-1 High Density Commercial Subdivisions
Form DRPC-2 High Density Developments with Outparcels
Form DRPC-3 High Density Residential Subdivisions
Form DRPC-4 Low Density Commercial Subdivisions
Form DRPC-5 Low Density Residential Subdivisions
Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets
By your signature below, you certify that the recorded property restrictions and protective covenants for this
project shall include all the applicable items required in the above form, that the covenants will be binding
on all parties and persons claiming under them, that they will run with the land, that the required covenants
cannot be changed or deleted without concurrence from the NC DWQ, and that they will be recorded prior to
the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater Permitting Unit at [phone] for the status and
availability of these forms. Forms can be downloaded from http:/Ili2o.enr,state.nc.us/sufbml2 forms.htm.
Form SW401-Low Density
Form SW401-Curb Outlet System
Form SW401-Off-Site System
Form SW401-Wet Detention Basin
Form SW401-Infiltration Basin
Form SW401-Infiltration Trench
Form SW401-Bioretention Cell
Form SW401-Level Spreader
Form SW401-Wetland
Form SW401-Grassed Swale
Form SW401-Sand Filter
Form SW401-Permeable Pavement
Form SW401-Cistern
Low Density Supplement
Curb Outlet System Supplement
Off-Site System Supplement
Wet Detention Basin Supplement
Infiltration Basin Supplement
Underground Infiltration Trench Supplement
Bioretention Cell Supplement
Level Spreader/Filter Strip/Restored Riparian Buffer Supplement
Constructed Wetland Supplement
Grassed Swale Supplement
Sand Filter Supplement
Permeable Pavement Supplement
Cistern Supplement
Form SWU-101 Version 09.25.08 Page 3 of4
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality
(DWQ). A complete package includes all of the items listed below. The complete application package
should be submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on
the interactive online map at httn:i/li?o.cnr.staie,nc.us su%msi maias.iiim)
1. Please indicate that you. have provided the following required information by initialing in the space
provided next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form dco4
• Original and one copy of the Deed Restrictions & Protective Covenants Form (if Al/'
required as per Part IV above)
• Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP _
• Permit application processing fee of $505 (Express: $4,000 for HD, $2,000 for LD)
payable to NCDENR
• Calculations & detailed narrative description of stormwater treatment/management _
• Copy of any applicable soils report 6< 4
• Two copies of plans and specifications (sealed, signed & dated), including:
- Development/Project name
- Engineer and firm
-Legend
- North arrow
- Scale
- Revision number & date
- Mean high water line
- Dimensioned property/ project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads, drainage features, collection systems, and stormwater control measures
- Wetlands delineated, or a note on plans that none exist."
- Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations
- Drainage areas delineated
- Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf (such as additional information requests), please complete this section. (ex. designing engineer or firm)
Designated agent (individual or firm):McKim & Creed
Mailing Address:1730 Varsity Drive, Suite 500
City:Raleigh State:NC Zip:27407
Phone: (919 l 233-8901 Fax: (919 ) 233-8031
En-tail:[e-mail]
VIII. APPLICANT'S CERTIFICATION
I, (print or hjpe name of person listen in General Information, item 2) Steve Biggs
certify that the information included on this permit application form is, to the best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans, that the required deed restrictions
and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A
NCAC 2H .1000../ _.--?
rte.
Signature: Date.
Form SWU-101 Version 09.25.08 Page 4 o€4

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STORMWATER MANAGEMENT PERMIT APPLICATION FORM
401 CERTIFICATION APPLICATION FORM
BIORETENTION CELL SUPPLEMENT
This form must be filled out, printed and submitted.
The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information.
i. PROJECT INFORMATION
Project name Clayton Parkway
Contact name Gareth Avant, EI
Phone number 919.2318091
Date
Drainage area number
Apnl 2, 2009
1
11..DSSION INFORMATION
Site Characteristics
Drainage area 182,468 ftz
Impervious area 15,022 ft'
Percent impervious 8.2% %
Design rainfall depth 1.0 inch
Peak Flow Calculations
Is pre/post control of the 1-yr, 24-hr peak flow required? Y (Y or N)
1-yr, 24-hr runoff depth 2.89 in
1-yr, 24-hr intensity 4.94 inlhr
Pre-development 1-yr, 24-hr peak flow 5,430 ft3isec
Post-development 1-yr, 24-hr peak flow 9.880 ft/sec
Pre/Post 1-yr, 24-hr peak control 4;450 ft'/sec
Storage Volume; Non-SA Waters
Minimum volume required 1,887.0 W
Volume provided 2,050.0 ft3 OK
Storage Volume; SA Waters
1.5" runoff volume ft'
Pre-development 1-yr, 24-hr runoff
Post-development 1-yr, 24-hr runoff
Minimum volume required 0 fl3
Volume provided fl3
Cell Dimensions
Ponding depth of water 12 inches OK
Ponding depth of water 1.00 ft
Surface area of the top of the bioretention cell 2,321.0 ftz OK
Length: 60 ft OK
Width: 30 ft OK
-or- Radius It
Media and Soils Summary
Drawdown time, ponded volume 12 hr OK
Drawdown time, to 24 inches below surface 11 hr OK
Drawdown time, total: 23 hr
In-s7fu soil
Soil permeability 0.50 in/hr Insufficient. Increase infiltration rate.
Planting media scil:
Soil permeability 1.00 inlhr OK
Soil composition
% Sand (by weight) 86% OK
% Fines (by weight) 9% OK
% Organic (by weight) 5°/0 OK
Total: 1000/0
Phosphorus Index (P-Index) of media (unitless)
Form SW401-Bioretention-Rev.7 Parts I and II. Design Summary, Page 1 or 2
PermA Number.
(to be provided by DWQ)
Basin Elevations
Temporary pool elevation 253.00 fmsi
Type of bioretention cell (answer "Y" to only one of the two
following questions):
Is this a grassed cell? Y (Y or N) OK
Is this a cell with trees/shrubs? N (Y or N)
Planting elevation (top of the mulch or grass sod layer) 252 fmsl
Depth of mulch inches
Bottom of the planting media soil 249,5 fmsi
Planting media depth 2.5 it
Depth of washed sand below planting media soil 0 it
Are underdrains being installed? Y (Y or N)
How many clean out pipes are being installed? 4 OK
What factor of safety Is used for sizing the underdrains? (See 2 OK
BMP Manual Section 12.3.6)
Additional distance between the bottom of the planting media and 1 ft
the bottom of the cell to account for underdrains
Bottom of the cell required 248.5 fmsi
SHWT elevation 235 fmsi
Distance from bottom to SHWT 115 it OK
Planting Plan
Number of tree species
Number of shrub species
Number of herbaceous groundcover species
Additional Information
Does volume in excess of the design volume bypass the Y (Y or N) OK
bioretention cell?
Does volume in excess of the design volume flow evenly distributed Y (Y or N) OK
through a vegetated filter?
What is the length of the vegetated filter? 0 it
Does the design use a level spreader to evenly distribute flow? N (Y or N) Show how flow is evenly distributed.
Is the BMP located at least 30 feet from surface waters (50 feet if Y (Y or N) OK
SA waters)?
Is the BMP localed at least 100 feet from water supply wells? Y (Y or N) OK
Are the vegetated side slopes equal to or less than 3:1? Y (Y or N) OK
Is the BMP located in a proposed drainage easement with access Y (Y or N) OK
to a public Right of Way (ROW)?
Inlet velocity (from treatment system) 4.5 ft/sec Insufficient inlet velocity unless energy dissipating devices are
being used.
Is the area surrounding the cell likely to undergo development in N Y or N)
( ) OK
the future?
Are the slopes draining to the bioretention cell greater than 20°x? N (Y or N) OK
Is the drainage area permanently stabilized? Y (Y or N) OK
Pretreatment Used
(Indicate Type Used with an "X" in the shaded cell)
Gravel and grass
(flinches gravel followed by 3-5 it of grass)
Grassed swale OK
Forebay X
Other
Form SW401-Bioretention-Rev.7 Parts I and 11 Design Summary, Page 2 of 2
Permit No.
(to be assigned by DWQ,)
1111. REQUIRED ITEMS' CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will
result in a request for additional information. This wilt delay final review and approval of the project. Initial in the space provided to
Indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Page/ Plan
Initials Sheet No.
GSr? 1. Plans (I'- 50' or larger) of the entire site showing:
Design at ultimate build-out,
Off-site drainage (if applicable),
Delineated drainage basins (include Rational C coefficient per basin),
- Cell dimensions,
- Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
2. Plan details (11" = 30' or larger) for the bioretention cell showing:
Cell dimensions
Pretreatment system,
High flow bypass system,
Maintenance access,
Recorded drainage easement and public right of way (ROW),
Design at ultimate build-out,
Off-site drainage (it applicable),
- Clean out pipe locations,
Overflow device, and
Boundaries of drainage easement.
Indicate the P-Index between 10 and 30
6/aJ 3. Section view of the bioretention cell (1" = 20' or larger) showing,
Side slopes, 3:1 or lower
Underdrain system (if applicable), and
Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable),
SHWf level(s), and overflow structure]
4C-4 Nt t3+ p 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWO, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feet mean sea level (fmsi). Results of soils tests of both the planting soil and the in
situ soil must include:
Soil permeability,
Soft composition (% sand, % fines, % organic), and
?,)?
44 P-index.
5. A detailed planting plan (1" = 20' or larger) prepared by a qualified individual showing:
A variety of suitable species,
Sizes, spacing and locations of plantings,
Total quantity of each type of plant specified,
A planting detail,
The source nursery for the plants, and
Fertilizer and watering requirements to establish vegetation.
6. An assurance that the installed system will meet design specifications upon initial operation once the
project is complete and the entire drainage area is stabilized.
7. A construction sequence that shows how the bioretention cell will be protected from sediment until the
entire drainage area is stabilized.
ill-WZ
8. The supporting calculations (including underdrain calculations, if applicable).
9. A copy of the signed and notarized inspection and maintenance (I&M) agreement.
1011A_ 10. A copy of the deed restriction.
Form SW401-Bioretention-Rev.7 Part III, Page i of t