20050613 Ver 1_Complete File_20051108

O?O? W A T ?q?G
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
November 8, 2005
Mr. D.R. Horton
2000 Aerial Center Parkway Suite # 110,
Morrisville, NC. 27560
Subject Property: West Lake Subdivision Phase # 1.
Approval of Storm water Management Plan
Dear Mr. Horton:
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 05-0613
Wake County
On October 31, 2005 the Division of Water Quality (DWQ) received the revised storm water management plan
prepared by your engineer, Mr. Mike Schneider, P.E., of Spaulding & Norris PA, to comply with the conditions of
401 Water Quality Certification issued on July 6, 2005.
The Plan has been reviewed and satisfies the storm water management conditions of the 401 and Neuse River Buffer
Rules as stated. The structural storm water practices as approved by DWQ as well as drainage patters must be
maintained in perpetuity. 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,
Neuse Buffer Rules and Non-discharge regulations.
No changes to the structural storm water practices shall be made without written authorization from the Division of
Water Quality. Storm water easements shall be recorded for a distance of at least 10 feet on each side of all storm
water conveyances on all lots containing these structures including future access for maintenance. The storm water
easements shall allow for the ability to maintain the structures, perform corrective actions as described above and
shall provide protection of the structures from potential alternations by future property owners. The authorization to
proceed with your proposed impacts or to conduct impacts to waters as depicted in your application and as
authorized by the Certification shall expire upon expiration of the 404 Permit.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act and the
Neuse riparian buffer protection rule as described within 15A NCAC 213 .0233. If you have any questions, please
telephone Sam A. Aghimien, at 919-733-3574.
CBKlsaa
Sincerely,
4-V4- "
ti- Alan W. Klimek, P.E.
cc: USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Mike Schneider, P.E, Spaulding & Norris PA, 972 Trinity Road, Raleigh, NC.27607
Filename: 05-0613 West Lake Sub Phase# 1, SWM Approval, 11-8-05
401 OversightlExpress Review Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone] /Internet: htto://h2o.enr.state.nc.us/ncvvetlands
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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
July 6, 2005
D.R. Horton
2000 Aerial Center Parkway, Suite 110
Morrisville, NC 27560
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 2005-0613
Wake County
Subject Property: Westlake Subdivision
UT to Middle Creek (Bells Lake) [03-04-03, 27-43-15-6, C NSW (nutrient sensitive)]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River Buffer
Protection Rules (15A NCAC 2B .0233) with Additional Conditions
Dear Sir or Madam:
You have our approval, in accordance with the attached conditions and those listed below, to place fill within or
otherwise impact 0.2480 acres of wetlands, 0.0459 acres of open waters and 10,298 square feet (ft) of protected
riparian buffers for the purpose of a residential subdivision at the subject property, as described within your
application dated April 11, 2005 and received by the N.C. Division of Water Quality (DWQ) on April 11, 2005 and
all additional information submitted and received by the DWQ on May, 11, 2005. After reviewing your application,
we have decided that the impacts are covered by General Water Quality Certification Number(s) 3402 (GC3402).
The Certification(s) allows you to use Nationwide Permit(s) 39 when issued by the US Army Corps of Engineers
(USACE). This letter shall also act as your approved Authorization Certificate for impacts to the protected riparian
buffers per 15A NCAC 2B .0233. 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, and Non-discharge regulations. Also, this approval to proceed with your proposed impacts or
to conduct impacts to waters as depicted in your application shall expire upon expiration of the 404 or CAMA
Permit.
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 Certification and approval letter and is thereby responsible for complying with all conditions. If
total fills for this project (now or in the future) exceed one acre of wetland or 150 linear feet of stream,
compensatory mitigation may be required as described in 15A NCAC 2H .0506 (h). This approval requires you to
follow the conditions listed in the attached certification and any additional 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
(Units) Plan Location or Reference
404 Wetlands 0.2480 (acres) WL-1.0, C-5
Waters 0.0459 acres WL-1.0, C-5
Buffers 10,298 (square ft. WL-1.0, C-5
2. Erosion & Sediment Control Practices
401 Oversight/Express Review Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone]/ FAX [phone]/ Internet: htto://h2o.enr.state.nc.us/ncwetlands
N One
Caro a
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An Equal Opportunity/Affirmative Action Employer - 50% Recycied/10% Post Consumer Paper
D. R. Horton
Page 2 of 4
7/6/05
Erosion and sediment control practices must be in full compliance with all specifications governing the
proper design, installation and operation and maintenance of such Best Management Practices in order to
protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed, operated, and
maintained in accordance with the most recent version of the North Carolina Sediment and Erosion
Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control measures
must be such that they equal, or exceed, the requirements specified in the most recent version of the
North Carolina Sediment and Erosion Control Manual. The devices shall be maintained on all
construction sites, borrow sites, and waste pile (spoil) projects, including contractor-owned or leased
borrow pits associated with the project.
3. No Waste, Spoil, Solids, or Fill of Any Kind
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.
4. Buffer Mitigation Plan
You are required to mitigate for impacts to the protected riparian buffers. The required area of mitigation
to compensate for impacts to the protected riparian buffers was calculated to be 259 square feet (sf) as
required under this Authorization Certificate and 15A NCAC 2B .0242(3). You shall submit a mitigation
plan as required under 15A NCAC 02B .0242 to this office for approval. The mitigation plan shall be
approved by the DWQ before any of the impacts approved under this Authorization Certificate occur.
Mitigation plans typically proposed include Buffer Restoration or Enhancement [ 15A NCAC 02B .0242(9)]
or Payment into the Riparian Buffer Restoration Fund [15A NCAC 02B .0242(7)].
5. Diffuse Flow
All constructed stormwater conveyance outlets shall be directed and maintained as diffuse flow at non-
erosive velocities through the protected stream buffers such that it will not re-concentrate before
discharging into a stream as identified within 15A NCAC 2B .0233 (5). If this is not possible, it may be
necessary to provide stormwater facilities that are considered to remove nitrogen. This may require
additional approval from this Office.
6. Protective Fencing
The outside buffer, wetland 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, wetland or water
prior to any land disturbing activities to ensure compliance with 15A NCAC 2B 33 and GC 3402.
7. Written Stormwater Management Plan
An additional condition is that a final, written stormwater management plan (including a signed and
notarized Operation and Maintenance Agreement) shall be approved in writing by this Office before the
impacts specified in this Certification occur per Condition No. 4 in GC No. 3402. The stormwater
management plan must include worksheets, plans and specifications for stormwater management facilities
that are appropriate for surface waters classified as Class C and designed to remove 85% TSS according to
the most recent version of the NC DENR Stormwater Best Management Practices Manual. These facilities
must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality. Also, before any permanent building is occupied at the subject site, the facilities
(as approved by this Office) shall be constructed and operational, and the stormwater management plan (as
D. R. Horton
Page 3 of 4
7/6/05
approved by this Office) shall be implemented. The structural stormwater practices as approved by this
Office as well as drainage patterns must be maintained in perpetuity. No changes to the structural
stormwater practices shall be made without written authorization from the Division of Water Quality.
The above condition shall apply unless it is demonstrated in writing to the satisfaction of this Office that
the impervious area of the entire, built-out project shall be less than 30% and that there are no pockets of
high-density development with concentrated impervious area over 30% area within the project such as, but
not limited to, commercial areas, multi-family, clubhouses, maintenance areas, etc.
8. Construction Stormwater Permit NCGO10000
Upon the approval of an Erosion and Sedimentation Control Plan issued by the Division of Land Resources
(DLR) or a DLR delegated local erosion and sedimentation control program, an NPDES General
stormwater permit (NCGO10000) administered by DWQ is automatically issued to the project. This
General Permit allows stormwater to be discharged during land disturbing construction activities as
stipulated by conditions in the permit. If your project is covered by this permit [applicable to construction
projects that disturb one (1) or more acres], full compliance with permit conditions including the
sedimentation control plan, self-monitoring, record keeping and reporting requirements are required. A
copy of this permit and monitoring report forms may be found at
http•//h2o enrstate.nc us/su/Forms Documents.htm.
9. Deed Notifications
Deed notifications or similar mechanisms shall be placed on all retained jurisdictional wetlands, waters and
protective buffers in order to assure compliance for future weiland, water and buffer impact. These
mechanisms shall be put in place prior to impacting any wetlands, waters and/or buffers approved for
impact under this Certification Approval and Authorization Certificate. A sample deed notification can be
downloaded from the 401/Wetlands Unit web site at http://h2o.enr.state.nc.us/ncwetlands. The text of the
sample deed notification may be modified as appropriate to suit to this project.
10. Culvert Installation
Installation of culverts in wetlands must ensure continuity of water movement and be designed to adequately
accommodate high water or flood conditions.
11. No Sediment & Erosion Control Measures w/n Wetlands or Waters
Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum extent
practicable. If placement of sediment and erosion control devices in wetlands and waters is unavoidable,
they shall be removed and the natural grade restored within six months of the date that the Division of Land
Resources has released the project.
12. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer
Rules, and any subsequent modifications, the applicant is required to return the attached certificate of
completion to the 401/Wetlands Unit, North Carolina Division of Water Quality, 1650 Mail Service Center,
Raleigh, NC, 27699-1650.
Violations of any condition herein set forth may result in revocation of this Certification and may result in criminal
and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct impacts to waters as
depicted in your application and as authorized by this Certification, shall expire upon expiration of the 404 or
CAMA Permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or stream
impacts), you may ask for an adjudicatory hearing. You must act within 60 days of the date that you receive this
letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of the North Carolina General
D. R. Horton
Page 4 of 4
7/6/05
Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This
certification and its conditions are final and binding unless you ask for a hearing.
Any disputes over determinations regarding thi's 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 letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act and the
Neuse riparian buffer protection rule as described within 15A NCAC 2B .0233. If you have any questions, please
telephone Cyndi Karoly at 919-733-1786.
AW Kldae
Enclosures: GC 3402
Certificate of Completion
Sincerely,
r Alan W. Klimek, P.E.
cc: Shawn Guyer-Spaulding & Norris, PA, 972 Trinity Road, Raleigh, NC 27607
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Filename: 20050613 Westlake(Wake)401+NBR
i
O?O? W A T ?9QG
O 'C
Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
July 6, 2005
R. Horton
2000 Aerial Center Parkway, Suite 110
Morrisville, NC 27560
Alan W. Klimek, P.E. Director
Division of Water Quality
DWQ Project # 2005-0613
Wake County
Subject Property: Westlake Subdivision
UT to Middle Creek (Bells Lake) [03-04-03, 27-43-15-6, C NSW (nutrient sensitive)]
Approval of 401 Water Quality Certification and Authorization Certificate per the Neuse River Buffer
Protection Rules (15A NCAC 2B .0233) with Additional Conditions
Dear Sir or Madam:
You have our approval, in accordance with the attached conditions and those listed below, to place fill within or
otherwise impact 0.2480 acres of wetlands, 0.0459 acres of open waters and 10,298 square feet (ft) of protected
riparian buffers for the purpose of a residential subdivision at the subject property, as described within your
application dated April 11, 2005 and received by the N. C. Division of Water Quality (DWQ) on April 11, 2005 and
all additional information submitted and received by the DWQ on Ma \\ 11, 2005. After reviewing your application,
we have decided that the impacts are covered by General Water Qualit} Certification Number(s) 3402 (GC3402).
The Certification(s) allows you to use Nationwide Permit(s) 39 when issued by the US Army Corps of Engineers
(USACE). This letter shall also act as your approved Authorization Certificate for impacts to the protected riparian
buffers per 15A NCAC 2B .0233. 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, and Non-discharge regulations. Also, this approval to proceed with your proposed impacts or
to conduct impacts to waters as depicted in your application shall expire upon expiration of the 404 or CAMA
Permit.
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 Certification and approval letter and is thereby responsible for complying with all conditions. If
total fills for this project (now or in the future) exceed one acre of wetland or 150 linear feet of stream,
compensatory mitigation may be required as described in 15A NCAC 2H .0506 (h). This approval requires you to
follow the conditions listed in the attached certification and any additional 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
Units Plan Location or Reference
404 Wetlands 0.2480 acres WL-1.0, C-5
Waters 0.0459 acres WL-1.0, C-5
Buffers 10,298 (square ft. WL-1.0, C-5
2. Erosion & Sediment Control Practices
401 OversighVExpress Review Unit
1650 Mail Service Center, Raleigh, North Carolina 27699.1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] / FAX [phone] / Internet: htto://h2o.enr.state.nc.us/ncwetlands
None Caro na
tiray
An Equal Opportunity/Affirmative Action Employer- 50% Recycled/10% Post Consumer Paper
D. R. Horton
Page 2 of 4
7/6/05
Erosion and sediment control practices must be in full compliance with all specifications governing the
proper design, installation and operation and maintenance of such Best Management Practices in order to
protect surface waters standards:
a. The erosion and sediment control measures for the project must be designed, installed, operated, and
maintained in accordance with the most recent version of the North Carolina Sediment and Erosion
Control Planning and Design Manual.
b. The design, installation, operation, and maintenance of the sediment and erosion control measures
must be such that they equal, or exceed, the requirements specified in the most recent version of the
North Carolina Sediment and Erosion Control Manual. The devices shall be maintained on all
construction sites, borrow sites, and waste pile (spoil) projects, including contractor-owned or leased
borrow pits associated with the project.
3. No Waste, Spoil, Solids, or Fill of Any Kind
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.
4. Buffer Mitigation Plan
You are required to mitigate for impacts to the protected rip an buffers. The required area of mitigation
to compensate for impacts to the protected riparian buffers ws calculated to be 259 square feet (sf) as
required under this Authorization Certificate and 15A NCAC ?,p .0242(3). You shall submit a mitigation
plan as required under 15A NCAC 02B .0242 to this office for approval. The mitigation plan shall be
approved by the DWQ before any of the impacts approved under this Authorization Certificate occur.
Mitigation plans typically proposed include Buffer Restoration or Enhancement [15A NCAC 02B .0242(9))
or Payment into the Riparian Buffer Restoration Fund [15A NCAC 02B .0242(7)].
5. Diffuse Flow
All constructed stormwater conveyance outlets shall be directed and maintained as diffuse flow at non-
erosive velocities through the protected stream buffers such that it will not re-concentrate before
discharging into a stream as identified within 15A NCAC 2B .0233 (5). If this is not possible, it may be
necessary to provide stormwater facilities that are considered to remove nitrogen. This may require
additional approval from this Office.
6. Protective Fencing
The outside buffer, wetland 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, wetland or water
prior to any land disturbing activities to ensure compliance with 15A NCAC 2B 33 and GC 3402.
7. Written Stormwater Management Plan
An additional condition is that a final, written stormwater management plan (including a signed and
notarized Operation and Maintenance Agreement) shall be approved in writing by this Office before the
impacts specified in this Certification occur per Condition No. 4 in GC No. 3402. The stormwater
management plan must include worksheets, plans and specifications for stormwater management facilities
that are appropriate for surface waters classified as Class C and designed to remove 85% TSS according to
the most recent version of the NC DENR Stormwater Best Management Practices Manual. These facilities
must be designed to treat the runoff from the entire project, unless otherwise explicitly approved by the
Division of Water Quality. Also, before any permanent building is occupied at the subject site, the facilities
(as approved by this Office) shall be constructed and operational, and the stormwater management plan (as
D. R. Horton
Page 3 of 4
7/6/05
approved by this Office) shall be implemented. The structural stormwater practices as approved by this
Office as well as drainage patterns must be maintained in perpetuity. No changes to the structural
stormwater practices shall be made without written authorization from the Division of Water Quality.
The above condition shall apply unless it is demonstrated in writing to the satisfaction of this Office that
the impervious area of the entire, built-out project shall be less than 30% and that there are no pockets of
high-density development with concentrated impervious area over 30% area within the project such as, but
not limited to, commercial areas, multi-family, clubhouses, maintenance areas, etc.
8. Construction Stormwater Permit NCGO 10000
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 (NCG010000) administered by DWQ is automatically issued to the project. This
General Permit allows stormwater to be discharged during land disturbing construction activities as
stipulated by conditions in the permit. If your project is covered by this permit [applicable to construction
projects that disturb one (1) or more acres], full compliance with permit conditions including the
sedimentation control plan, self-monitoring, record keeping and reporting requirements are required. A
copy of this permit and monitoring report forms may be found at
http •//h2o enr state nc. uslsulForins Documents. htm.
Deed Notifications
l
Deed notifications or similar mechanisms shall be placed on, 11 retained jurisdictional wetlands, waters and
protective buffers in order to assure compliance for future weand, water and buffer impact. These
mechanisms shall be put in place prior to impacting any wetl s, waters and/or buffers approved for
impact under this Certification Approval and Authorization Certificate. A sample deed notification can be
downloaded from the 401/Wetlands Unit web site at http://h2o.elir.state.nc.us/ncwetlands. The text of the
sample deed notification may be modified as appropriate to suit to this project.
10. Culvert Installation
Installation of culverts in wetlands must ensure continuity of water movement and be designed to adequately
accommodate high water or flood conditions.
11. No Sediment & Erosion Control Measures w/n Wetlands or Waters
Sediment and erosion control measures shall not be placed in wetlands or waters to the maximum extent
practicable. If placement of sediment and erosion control devices in wetlands and waters is unavoidable,
they shall be removed and the natural grade restored within six months of the date that the Division of Land
Resources has released the project.
12. Certificate of Completion
Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer
Rules, and any subsequent modifications, the applicant is required to return the attached certificate of
completion to the 401/Wetlands Unit, North Carolina Division of Water Quality, 1650 Mail Service Center,
Raleigh, NC, 27699-1650.
Violations of any condition herein set forth may result in revocation of this Certification and may result in criminal
and/or civil penalties. The authorization to proceed with your proposed impacts or to conduct impacts to waters as
depicted in your application and as authorized by this Certification, shall expire upon expiration of the 404 or
CAMA Permit.
If you do not accept any of the conditions of this Certification (associated with the approved wetland or stream
impacts), you may ask for an adjudicatory hearing. You must act within 60 days of the date that you receive this
letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of the North Carolina General
D. R. Horton
Page 4 of 4
7/6/05
Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This
certification and its conditions are final and binding unless you ask for a hearing.
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 letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act and the
Neuse riparian buffer protection rule as described within 15A NCAC 2B .0233. If you have any questions, please
telephone Cyndi Karoly at 919-733-1786.
AWK/dae
Enclosures: GC 3402
Certificate of Completion
Sincerely,
r Alan W. Klimek, P.E.
cc: Shawn Guyer-Spaulding & Norris, PA, 972 Trinity Road, Raleigh, NC 27607
USACE Raleigh Regulatory Field Office
DWQ Raleigh Regional Office
DLR Raleigh Regional Office
File Copy
Central Files
Filename: 20050613 Westlake(Wake)401+NBR
SPAULDING & NORRIS P.A.
OiN Design Consultants
972 Trinity Road TEL [phone]
Raleigh, North Carolina 27607 R19@WLY 25
Transmittal NOV 2 -.2005
Date: 11-2-05 Job. No: 556-05 DENR • WATER QUALITY
WITLA M MO 8t0WWATA pRANW
To: NC Division of Water Quality, Central Office
2321 Crabtree Boulevard Suite 250
Raleigh, NC 27604-226o
Attn: Samuel himien
Re: Stormwater Management Plan for West Lake Subdivision (DWQ # 2005-o61.3)
Sending:
® Attached ? Under separate cover the following
via items:
® Prints/Plans ? Shop Drawings ? Specifications ? Samples
? Other.
Copies Date Description
1 11-2-0sheets of Landsca Plans lper reauest
Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
? As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Please feel free to contact me if you have any questions. Thank you.
Cony to: _C
Mike
SPAULDING & NORRIS, PA
Planning ? Civil Engineering ? Environmental
October 28, 2005
Mr. Samuel Aghimien
NC Division of Water Quality - Central Office
401 Oversight / Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Re: Response to Additional Conditions specified in 401 Water Quality Certification and
Neuse River Buffer Rule Authorization Certificate Approval, dated July 6, 2005.
West Lake Subdivision (Phase I)
Cary, Wake County, North Carolina
DWQ Project # 05-0613
Dear Mr. Aghimien,
This letter is in response to the phone conversations we have had about revising the dry detention
ponds to provide 85% TSS removal. Per those conversations I have revised the dry detention ponds to
extended dry detention ponds with grass swales to provide the required 85% TSS removal. Enclosed
is the Stormwater Management Calculation report which contains the calculations and the worksheets
for the extended dry ponds and grass swales and revised plan sheets C-5, C-6, C-19, C-20, C-21 and a
revised Operation and Maintenance Agreement.
Thank you in advance for your time spent reviewing this response. Do not hesitate to contact me if
you have questions, comments or concerns about this information.
Sincerely,
i Mike Schneider, P.E.
Phone: [phone] • Fax: [phone] Trinity Road • Raleigh, North Carolina 27607
Operation and Maintenance Schedule for
Level Spreaders, Extended Dry Detention Basins and
Grassed Swales
for
West Lake Subdivision
Wake County, North Carolina
A: Level Spreaders
Level spreaders or other structures that provide diffuse flow shall be maintained
every six months. All accumulated sediment and debris shall be removed from
the structure, and a level elevation shall be maintained across the entire flow
spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
B: Extended Dry Detention Basins
Maintenance activities shall be performed as follows:
After every significant runoff producing rainfall event and at least monthly:
a. Inspect the dry detention basin system for sediment accumulation,
erosion, trash accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the
temporary pool occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good
vegetative cover, mow vegetative cover to maintain a maximum height of six
inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales,
riprap, etc.) quarterly to maintain proper functioning.
4. Remove accumulated sediment from the dry detention basin system semi-
annually or when depth is reduced to 75% of the original design depth.
Removed sediment shall be disposed of in an appropriate manner and shall
be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a detention basin or stream, etc.).
5. All components of the dry detention basin system shall be maintained in
good working order.
Pagel of 3
C: Grassed Swales
• Swale maintenance basically involves normal grass management activities
such as mowing and resodding when necessary and periodic sediment
removal, if significant deposition occurs, Maintenance shall be performed as
follows:
• At least once annually, remove excess sediment, especially from the
upstream edge, to maintain original contours and grading.
• At least once annually, repair any erosion and regrade the swale to ensure
that the runoff flows evenly in a thin sheet through the swale.
• At least once annually, inspect vegetation and revegetate the swale to
maintain a dense growth of vegetation.
• Grassed swales shall be mowed at least twice annually to a maximum height
of six inches.
Page 2 of 3
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ
of any problems with the system or prior to any changes to the system or
responsible party.
Print name: ti' C C
Title: C a" s" -T A c v L 1-.0 ?/0 e-? 7
Address. 2 e, 7 ?- i` "C r l i
Phone:
Signature:
Date: /o/
o Z? 3 2-
0
Note: The legally responsible party should not be a homeowners association
unless more than 50% of the lots have been sold and a resident of the
subdivision has been named the president.
I, J --rl n \' ! fq - S J-ci rl I e y , a Notary Public for the State of
N0(+h co-fokrn0. ,
that -? o Vr, rN \-\
County of W C ? e_ , do hereby certify
ticLne e
personally appeared before
me this .93 day of Oc4o6er , 9005 , and acknowledge the due
execution of the forgoing level spreader maintenance requirements. Witness my
hand and official seal,
JENNY A. STANLEY
NOTARY PUBLIC
WAKE COUNTY, N.C.
My Commission Expires M 3 2U10
SEAL
My commission expires
Page 3 of 3
ING & NORRIS. P.A.
972 Trinity Road
Raleigh, North Carolina 27607
Transmittal
Date: 10-31-05
TEL [phone]
FAX [phone]
r@r,!=9Wffl I
Job. No: 556-05 O C T' 8 1 2009
To: NC Division of Water Quality, Central Office p , =At"'
H
2321 Crabtree Boulevard Suite 2,50
Raleil;h, NC 27604-226o
Attn: Samuel A "mien
Re: Stormwater Management Plan for West Lake Subdivision (DWQ # 2005-o613)
Sending:
® Attached ? Under separate cover
via
the following
items:
® Prints/Plans ? Shop Drawings ? Specifications ? Samples
? Other:
Copies Date Description
1 10-31-05 Stormwater management Plan with Attachments
1 10-28-o ration and Maintenance AueemeBt

Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
? As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Please feel free to contact me if you have an questions. Thank you.
Conv to: ?`-
Mike Schneider
972 Trinity Road
Raleigh, North Carolina 27607
Design Consultants
Transmittal
Date: 09.13.2005 Job. No:
-TEL [phone]
FAX [phone]

556-05 DWQ Project # 05-o613
To: NC Division of Water Oualitv, Central Office
2,121 Crabtree Boulevard
Raleigh, NC 27604-226o
Attn: Mr. Sam Aghimien
Re: Requested Site Data, Drawing Sheet C-3 "Site Plan"
Sending:
® Attached ? Under separate cover the following
via items:
® Prints/Plans ? Shop Drawings ? Specifications ? Samples
Copies Date Description
1 0 .18.200 Requested Drawing Sheet
? Other:
Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
® As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Mr. Aghimien, please find attached the information you requested in our
conversation on September 1g_ 2oor,_
-?:P-7-2005 02:24P FROM:SPAULDING NORRIS 9198547925 T0: 56893
SPAULDING & NORRIS PA
Planning ? Civil Engineering • Environmental
FAX TRANSMITTAL
Date: 6q•01-'zoos
To: Art !%H 1011EN
Company: Nc. -DA4Q
From: S kuv-Z
RE: 14561 CAKS SalsomstaN
P.1
Project No. 5S6 -0s
'DO4 AA.I UV-T 1k 7,005-0(oc-5
Office No.:, R A .243.35 I4
Fa: No. gA-4-SI.4Wt3
Number of Pages: z- (Including this cover sheet) 1
Remarks: 45 &CL 4.,o- 2EQQF11
Copy To:
Phone: [phone] • Fax: [phone] Trinity Plead • Raleigh, North Carolina 27607
SEP-7-2005 WED 12:50 TEL:[phone] NAME:DWO-WETLANDS P. 1
C?EP-7-2005 02:24F FROM:SPAULDING NORRIS 9198547925 TO:7336893 P.2
f
SPAULDING & NORRIS, PA
w
Planning • Civil Engineering ? Environmental
September 7, 2005
Mr. Sam Aghimien
North Carolina Division of Water Quality
401 Oversight and Express Permits Unit
2321 Crabtree Blvd
Raleigh, NC 27604
Dear Mr. Aghimlen,
S&N Project # 556-05
DWQ Project # 2005-0613
I am sending you the areas you requested during our conversation yesterday afternoon.
I would like to first reiterate that it has always been our understanding that site imperviousness is
based upon the amount of impervious area on the site compared to the overall site area. This is
clearly specified in section XI of the most recent version of the NC DWCVUSACE Pre-
Construction Notification Form:
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.
In Phase I of West Lake Subdivision, there are approximately 3.28 acres of surface
waters in the form of a farm pond, Around that pond and a small segment of stream on the
eastern boundary of the property there are approximately 1.60 acres of Neuse Riparian Buffers.
Please call If you have any more questions.
sincerely,
Shawn F. Guyer, EIT
Environmental Engineering Assistant
CC: Ms. Debbie Edwards, NC DWQ
Phone: [phone] • Fax: [phone] Trinity Road • Raleigh, North Carolina 27607
SEP-7-2005 DIED 12:51 TEL:[phone] NAME:DWO-WETLANDS P. 2
01
I
.R ' 11
Date: o8.18.2005 DhIbV?,iMWA1 DWQ Project # 05-0613
WETLAND
To: NC Division of Water Oualitv, Central Office
2.121 Crabtree Boulevard
Raleigh, NC 27604-226o
Attn: Ms. Debbie Edwards
Re: Letter regarding Permit Additional Conditions for West Lake Subdivision
Sending:
® Attached ? Under separate cover
via
the following
items:
? Prints/Plans ? Shop Drawings ? Specifications ? Samples
? Other:
Copies Date Description
1 08.18.200 Letter
1 o8.18.2oo Receipt from NC EEP

Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
? As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Debbie - Here is a letter in response to our recent conversations.
972 Trinity Road TEL [phone]
Raleigh, North Carolina 27607 NW n FAX [phone]
Transmittal AiS??? 7ba //
Civil Engineering & Planning
August 18, 2005
Ms. Cyndi Karoly
NC Division of Water Quality - Central Office
401 Oversight / Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Re: Response to Additional Conditions specified in 401 Water Quality Certification and
Neuse River Buffer Rule Authorization Certificate Approval, dated July 6, 2005.
West Lake Subdivision (Phase I)
Cary, Wake County, North Carolina
DWQ Project # 05-0613
Dear Ms. Karoly,
This letter is in response to two of the additional conditions specified in the July 6, 2005 Approval of
401 Water Quality Certification and Authorization Certificate per the Neuse River Buffer Protection
Rules for West Lake Subdivision - Phase I, in Cary, North Carolina.
The first additional condition was a requirement to mitigate for impacts to protected riparian buffers.
The impacted area was 86.27 square feet of Zone 1 Neuse River Buffer. The required area of
mitigation to compensate for impacts to the protected riparian buffers was calculated to be 259 square
feet. In response, we have approached the North Carolina Ecosystem Enhancement Program's (NC
EEP) In-Lieu-Fee Program to make a payment to mitigate the impacts. Approval for payment was
issued on July 21, 2005. The payment receipt, dated August 18, 2005 is attached for your
convenience.
The second condition was approval in writing by NC DWQ of a final, written stormwater management
plan. A stormwater management plan was prepared for the entire West Lake Subdivision Project
(Phases I & II) and submitted to your office on July 20, 2005. The condition also states that the
stormwater management plan requirement shall apply unless it is demonstrated in writing to the
satisfaction of NC DWQ that the impervious area of the entire built-out project shall be less than 30%
and that there are no pockets of high-density development with concentrated impervious over 30% area
within the project. In a conversation with Ms. Deborah Edwards of NC DWQ, we were informed that
Phase II of West Lake Subdivision qualifies as a pocket of high-density development and, as such, that
portion of the project would require stormwater management facilities appropriate to Class C surface
waters and designed to remove 85% TSS.
We are seeking written approval to proceed with Phase I of the project. We believe that the second
condition does not apply to Phase I. The impervious area of the entire, built-out project (including
Phases I & II) ranges from 25.1 % to 27.9%. The range in percentages is the result of variation in
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
impervious surface for each lot in Phase I. Detailed impervious calculations are available in the
Stormwater Management Plan submitted on July 20, 2005. We understand that Phase II is a pocket of
high-density development and requires modifications. We are currently in the process of designing
stormwater management facilities that meet the NC DWQ requirements. When these facilities have
been designed, a revised Stormwater Management Plan will be submitted to NC DWQ. In the
meantime, since Phase I is not considered a pocket of high-density development and the overall built-
out project impervious area is less than 30%, we would like approval to proceed with construction of
Phase I.
Thank you in advance for your time spent reviewing this response. Do not hesitate to contact me if
you have questions, comments or concerns about this information.
jj??
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
1, ?' rh? 'N--
Fco . stem
PROGRAM
RECEIPT
August 18, 2005
DWQ #: 05-0613
COE #: N/A
D. R. Horton, Inc.
301 Commerce Street, 5`s Floor
Fort Worth, TX 76102
Project: Westlake Subdivision County: Wake
The North Carolina Ecosystem Enhancement Program (NC EEP) has received a check in the amount of $248.64, check
numbers 702546 & 7307, as payment for the compensatory mitigation requirements of the 401 Water Quality
Certification/Section 404 Permit issued for the above referenced project. This receipt serves as notification that the
compensatory mitigation requirements for this project have been satisfied. You must also comply with all other conditions of
this certification and any other state, federal or local government permits or authorization associated with this activity.
The NC EEP, by acceptance of this payment, acknowledges that the NC EEP is responsible for the compensatory mitigation
requirements associated with the project permit and agrees to provide the compensatory mitigation as specified in the permit.
The mitigation will be performed in accordance with the Memorandum of Understanding between the NC Department of
Environment and Natural Resources and the US Army Corps of Engineers dated November 4, 1998, as indicated in the table
below.
River Basin Wetlands Stream Buffer Buffer
Cataloging (Acres) (Linear Feet) Zone 1 Zone 2
Unit (Sq. Ft.) (Sq. Ft.)
Riparian Non-Riparian Coastal Marsh Cold Cool Warm
Neuse 0 0 0 0 0 0 259 0
03020201
Please note that a payment made to the Ecosystem Enhancement Program is not reimbursable unless a request for
reimbursement is received within 12 months of the date of the receipt. Any such request must also be accompanied by letters
from the permitting agencies stating that the permit and/or authorization have been rescinded.
If you have any questions or need additional information, please contact Carol Shaw at [phone].
Eiam Gilmore, PE
Director
cc: Cyndi Karoly, Wetlands/401 Unit
Andrea Wade, USACE - Raleigh
Eric Kulz, DWQ Regional Office - Raleigh
File
2zmtoripfg... 'E... Prot" oar Stag
MUM
North Carolina Ecosystem Enhancement Program, 1652 Mail Service Center, Raleigh, NC 27699-1652 / 919-715-0476 / www.nceep.net
Date: 7-20-05 Job. No: 556-o5 DENR - WATER QUALITY
WETLANDS AND STORMWATER BRANCH
To: NC Division of Water Quality, Central Office
2.121 Crabtree Boulevard Suite 25o
Raleigh, NC 27604-226o
Attn: Ms. Cyndi Kawly
Re: Stormwater Management Plan for West Lake Subdivision (DWQ # 2005-o6ii)
Sending:
® Attached ? Under separate cover the following
via items:
® Prints/Plans ? Shop Drawings ? Specifications ? Samples
0 Other.
Copies Date Description
i -20-0Stormwater mans ement Plan with Attachments
Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
? As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Please feel free to contact me if you have any questions. Thank you.
Cow to:
972 Trinity Road TEL [phone]
Raleigh, North Carolina 27607 n R 0 5
Transmittal JUL 2 0 2005
SPAULDING & NORRIS, PA
Planning ? Civil Engineering ? Environmental
July 20, 2005
Ms. Cyndi Karoly
NC Division of Water Quality
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Q?c??ae?Do
JUL 2 0 2005
WETLANDS ANDSTTONWA RIPANCH
Re: Stormwater Management Plan for West Lake Subdivision,
in Cary, NC (Wake County)
DWQ Project # 2005-0613
Dear Ms. Karoly,
Attached, please find information pertaining to stormwater management for West Lake
Subdivision, Phases I and II, which we are submitting as the Stormwater Management
Plan for the project. Phase I of the project received approval of 401 Water Quality
Certification and a Neuse River Buffer Authorization Certificate with Additional
Conditions on July 6, 2005 from the NC Division of Water Quality (DWQ). An
&POea'' authorization for Pho& .was submitted to NC DWQ on July 8, 2005. pt
The additional conditions for Phase I approval included Buffer Mitigation and the
preparation of this Plan. An application was submitted to the NC Ecosystem
Enhancement Program on July 11, 2005 requesting In Lieu Payment to offset the Neuse
River Buffer impacts associated with Phase I.
The Stormwater Management Plan consists of site layouts; erosion control, grading, and
drainage plans; stormwater structure design details; stormwater drainage schedule; the
Stormwater and Erosion Control Calculations; impervious surface calculations; and
DWQ stormwater structure design worksheets for both Phase I and Phase II.
The final impervious calculations for Phases I and II result in the following:
Phase I Final Impervious Percentage: 23.4% - 28.9%
Phase II Final Impervious Percentage (with Recreation Site): 26.9%
Phase II Final Impervious Percentage (without Recreation Site): 25.7%
Overall Combined Impervious Percentage: 25.1% - 27.9%
The range in percentages is the result of the potential for variations in impervious
surfaces per lot in Phase I. There are twelve different house products available for
construction on each lot. The are also multiple options for each product that modify the
amount of impervious surface, as well as three front setback options that change the
Phone: [phone] • Fax: [phone] Trinity Road • Raleigh, North Carolina 27607
driveway length. The final built-out Phase I will include many of these different
product/option/setback combinations and a range from 2,774 square feet of impervious
surface for the smallest option (including the house, driveway, patio, deck, and front
walk) to 4,163 square feet of impervious surface for the largest option, thus the range in
impervious area from 23.4% to 28.9%. The impervious areas for Phase II include the
future Recreation Site located in the northern portion of Phase II adjacent to the existing
pond.
The impervious areas of both Phase I and Phase II, as well as the overall site impervious
area, are well below the 30% threshold, so the 85% TSS removal requirement would not
apply to the entire site. We do not believe that the Phase II Townhomes, not including
the Recreation Site, qualify as a pocket of high-density development with concentrated
impervious surface.
The Phase II townhomes are spread throughout the usable portions of Phase II. A large
portion of Phase H consists of,open space, pond (-20% of Phase II), wetlands, streams,
Neuse River Buffers and areas that are inaccessible because of these features. Phase II
was designed to completely avoid any impacts to pond, streams, wetlands or Neuse River
Buffers. The townhomes were integrated with open space areas, including a large
landscaped area in the middle of the townhomes, to further reduce the potential
concentration of impervious surface.
Thank you for your time spent reviewing this information. Please do not hesitate to
contact me if you have questions, comments or concerns about this Stormwater
Management Plan.
Sincerely,
5oR Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
Index to Attachments
Operations and Maintenance Agreement for Level Spreaders and Dry Detention Basins
(Signed & Notarized)
Phase I:
Impervious Calculations
DWQ Level Spreader Worksheet (for pond #1)
DWQ Level Spreader Worksheet (for pond #3)
DWQ Level Spreader Worksheet (for pond #4)
Drawing Sheet C-5 - West Lake Subdivision Phase I - Single Family - Grading and
Drainage Plan
Drawing Sheet C-6 - West Lake Subdivision Phase I - Single Family - Erosion Control
Plan
Drawing Sheet C-19 - West Lake Subdivision Phase I - Single Family - Construction
Detail Sheet
Drawing Sheet C-20 - West Lake Subdivision Phase 1 - Single Family - Construction
Detail Sheet
Drawing Sheet C-21 - West Lake Subdivision Phase I - Single Family Drainage and
Erosion Control Schedules
Stormwater and Erosion Control Calculations for West Lake Subdivision Phase I - Single
Family, Cary, North Carolina (revised 05.31.2005)
Phase II:
Impervious Calculations
DWQ Level Spreader Worksheet (for pond #1)
Drawing Sheet C-6 - West Lake Subdivision Phase 2 - Townhomes - Grading and
Drainage Plan
Drawing Sheet C-7 - West Lake Subdivision Phase 2 - Townhomes - Erosion Control
Plan
Drawing Sheet C-12 - West Lake Subdivision Phase 2 - Townhomes Drainage and
Erosion Control Schedules
Drawing Sheet C-18 - West Lake Subdivision Phase 2 - Townhomes - Construction
Detail Sheet
Drawing Sheet C-19 - West Lake Subdivision Phase 2 - Townhomes - Construction
Detail Sheet
Stormwater and Erosion Control Calculations for West Lake Subdivisioq Phase II -
Townhomes, Cary, North Carolina (03.31.2005)
Operation and Maintenance Schedule for
Level Spreaders and Dry Detention Basins
for
West Lake Subdivision
Wake County, North Carolina
A: Level Spreaders
Level spreaders or other structures that provide diffuse flow shall be maintained
every six months. All accumulated sediment and debris shall be removed from
the structure, and a level elevation shall be maintained across the entire flow
spreading structure. Any down gradient erosion must be repaired and/or
replanted as necessary.
B: Dry Detention Basins
Maintenance activities shall be performed as follows:
1. After every significant runoff producing rainfall event and at least monthly:
a. Inspect the dry detention basin system for sediment accumulation,
erosion, trash accumulation, vegetated cover, and general condition.
b. Check and clear the orifice of any obstructions such that drawdown of the
temporary pool occurs within 2 to 5 days as designed.
2. Repair eroded areas immediately, re-seed as necessary to maintain good
vegetative cover, mow vegetative cover to maintain a maximum height of six
inches, and remove trash as needed.
3. Inspect and repair the collection system (i.e. catch basins, piping, swales,
riprap, etc.) quarterly to maintain proper functioning.
4. Remove accumulated sediment from the dry detention basin system semi-
annually or when depth is reduced to 75% of the original design depth.
Removed sediment shall be disposed of in an appropriate manner and shall
be handled in a manner that will not adversely impact water quality (i.e.
stockpiling near a detention basin or stream, etc.).
Page 1 of 2
5. All components of the dry detention basin system shall be maintained in
good working order.
I acknowledge and agree by my signature below that I am responsible for the
performance of the maintenance procedures listed above. I agree to notify DWQ
of any problems with the system or prior to any changes to the system or
responsible party.
Print name:W lb &01-1- MOW 150Y)
Note: The legally responsible party should not be a homeowners association
unless more than 50% of the lots have been sold and a resident of the
subdivision has been named the president.
I, Mme- L • L Q! , a Notary Public for the State of
?bR?lk Gt?.Rbyl?J?. , County of W Q?I-E- , do hereby certify
that bn,j I o a;K-PI-T Mbag tGo?-) personally appeared before
me this day of Su L--( , -UO S , and acknowledge the due
execution of the forgoing level spreader maintenance requirements. Witness my
hand and official seal,
NOTARY
PUBLIC
COUIA,

SEAL
My commission expires - a)g
Page 2 of 2
Date: --i 11816
S
West Lake Subdivision - Phase I Impervious Calculations
Existing Impervious (to be removed)
Impervious Areas:
Streets, Curb & Gutter
Sidewalks & Sections of
Multi-Use Trail
Greenway Trail
5,596.64 sgft 0.13 acres
154,314.27 sgft 3.54 acres
54,625.19 sqft 1.22 acres
21,551.15 sqft 0.49 acres
9 Rc?Radfq
JUL 2 6 2005
DENR - WATER QUALITY
1DSANO STO"WATER BRANCH
*Total Impervious Area: 5.29 acres /
Total Site Area: 43.10 acres
*Total Impervious Percentage: 12.3%
* not including impervious area from houses, patios, decks, driveways, and walkways
Total number of lots:
75 -
There are twelve different products available for construction on each lot. The are multiple options for
each product that modify the amount of impervious surface, as well as three setback options that change the
driveway length. The final build out of the subdivision will include many of these different
product/option/setback combinations and a range of impervious area per lot between the following:
Impervious area for largest Product Combination: 4,163 sqft
(house, driveway, patio, deck, walkways)
Impervious area for smallest Product Combination: 2,774 sqft
(house, driveway, patio, deck, walkways)
Total Impervious Area for build out with largest combination on every lot: 7.1677 acres
Total Impervious Area for lots and other impervious areas: 12.4577 acres
Total Impervious Percentage for build out with largest product: 28.93%
Total Impervious Percentage for build out with smallest product: 23.36%
DWQ Project No. zoos-- n 613
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name: --le- Pk Y.
Contact Person: Phone Number:
Level Spreader ID:. p 0 M1') -.
Level Spreader Length 2 2 ft.
Drainage Area 3. K 5 ac.
Impervious Area I . Q?} ac.
Maximum Filter StripSuffer Slope -Z- 0/14p %
grass
Max. Discharge from a 10 Year Storm 3 - q3 cfs
Max. Discharge to Level Spreader 6. ?2 cfe
Filter Stripftffer Vegetation -rhkLk M
c ov<-
Pre-treatment or Bypass Method a P h
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for treated, leaf littler cover, 8% for thick ground cover)"
(thick ground cover or grass, canopied forest with leaf litter
groundcover)
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 stomowater 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.
ADDlicants Initials
Level spreader is at least 13 It per cfs for thick ground cover or grass or 100 ft per cfe in canopied forest with leaf
litter.
,Q 1A Pre-Form Scour Holes are on flat slopes only
iti+ No structures are located in protected buffbW
If bypass method specified in the Draft Level Spreader Design Option Document:
Bypass method is specified (if applicable) and plan details and calculations are provided
tit Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
No structures are located in protected buffers.
$Q?A Plan details for the bypass and outlets are provided.
,+H 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.
c?gvgj
Q
JUL202N5
J Wv Jpg ND ST fko mi Bt"H
DWQ Project No. Z 00 5 - a is 13
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
Project Name : IN ( L" k f R-, i
Contact Person: Phone Number: I )
Level Spreader ID:. p e-> r i c> 3
Level Spreader Length 60 ft.
Drainage Area -7. b ac.
Impervious Area '3- Li I ac.
Maximum Filter StriplBuffer Slope 5.0 %
grass
Max. Discharge from a 10 Year Storm 4.6 4 cis
Max. Discharge to Level Spreader q .05, cfs
Filter Strip/BufferVegetation fhiclt 2
prnu-a
GoVLY of c re,SS
(perpendicular to flow)
(on-site and off-site drainage to the level spreader)
(on-site and off-site drainage to the level spreader)
(6% for treated, leaf littler cover, 8% for thick ground coverp
(thick ground cover or grass, canopied forest with leaf litter
groundoover)
Pre-treatment or Bypass Method 7/:?
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.
Auplicants Initials
Level spreader is at last 13 ft per cfs for thick ground cover or grass or 100 ft per cfs in canopied forest with leaf
litter.
rV 1A Pre-Form Scour Holes are on fiat slopes only
164 No structures are located in protected buffW
If bypass method specified in the Draft Level Spreader Design Option Document:
Q I A Bypass method is specified (if applicable) and plan details and calculations are provided
ri 1A Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
N 1A No structures are located in protected butters.
Plan details for the bypass and outlets are provided.
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 N 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.
Q9 1"=@?od[9 @
JUL 2 0 2005
WATER WETWrDS AND STONWATER BRANCH
DWQ Project No. 2001' b G 13
DIVISION OF WATER QUALITY - LEVEL SPREADER WORKSHEET
1. PROJECT INFORMATION (plelase complete the following information):
Project Name Lc. kkG PL, 7
Contact Person: Phone Number: L )
Level Spreader ID:. 'p (-?, W D 1"
Level Spreader Length 1$ ft. (perpendicular to flow)
Drainage Arse 3100 ac. (on-site and off-site drainage to the level spreader)
Impervious Area ) ac. (on-site and off-site drainage to the level spreader)
Maximum Filter SfroBuffer Slope 16. e; % (6% for forested, leaf littler cover, 8% for thick ground cover}"
grass
Max. Discharge tram a 10 Year Stone . 3 3 cle
Max. Discharge to level Spreader 519 o cfs
Filter Ship/Buffer Vegetation e,d ?I (thick ground cover or grass, canopied forest with leaf litter
nj ?• " s groundcover)
Pre-treatment or Bypass Method Di ,j
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 stommter 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
ADDlicants Initials
lti+ 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.
A4 A Pre-Form Scour Holes are on flat slopes only
No structures are located in protected buffers"
If bypass method specified in the Draft Level Spreader Design Option Document:
MIA Bypass method is specified (if applicable) and plan details and calculations are provided
ry Discharge to level spreader and subsequent filter strip is hydraulically and spatially separate from the bypass
discharge.
NIA No structures are located in protected buffers.
Ki JA Plan details for the bypass and outlets are provided.
A* The operation and maintenance agreement includes annual erosion and vegetation repair.
4w- 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.
PJUL 2 0 2005
DENR - WATER QUALITY
WETLANDS AND STORMWAQ t3Rg"
10.

Civil Engineering & Planning
May 10, 2005
Ms. Cyndi Karoly
NC Division of Water Quality - Central Office
401 Oversight / Express Review Permitting Unit
2321 Crabtree Boulevard, Suite 250
Raleigh, NC 27604-2260
Re: Request for Additional Information for West Lake Subdivision
Cary, Wake County, North Carolina
DWQ Project Aft S06I3
Dear Ms. Karoly,
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This letter is in response to your request for more information dated April 22, 2005, regarding West Lake
Subdivision, in Cary, North Carolina. Our response to your request for additional information follows:
1) Impervious Surface Area -Please provide detailed breakdown of impervious surface areas.
The following is a breakdown of the impervious calculations associated with Phase I of West Lake
Subdivision.
5,596.64 Sqft 0.13 Acres
Existing Impervious Area (to be removed)
Proposed Impervious Areas:
5' Wide Sidewalk & Sections of 10' wide Multi-use Trail 54,625.19 Sqft 1.22 Acres %
Greenway Trail 21,551.15 Sqft 0.49 Acres p 4,
27' Back to Back Streets (including curb & gutter) 154,314.27 Sqft 3.54 Acres
Total 230,490.61 Sqft 5.29 Acres
1,877,436.00 Sqft 43.10 Acres
Phase l Area
563,230.80 Sqft 12.93 Acres
12.28%
17.72%
332,681.66 Sqft 7.64 Acres
75
30% Impervious Threshold
Percent Impervious from Sidewalks, Greenway, and Streets
Percent remaining before 30% threshold is exceeded
Area remaining before 30% threshold is exceeded
Lots in Phase I
4,435.76 Sqft 0.10 Acres
Allowable impervious area per lot before 30% threshold is exceeded
2,200 Sqft X
Average house size
Area remaining for non-house impervious surfaces per lot 2,235.76 Sqft 0.05 Acres
(driveway, patio, walkway)
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
5
ti.
Thank you in advance for your time spent reviewing this additional information. Do not hesitate to contact me
if you have questions, comments or concerns about this information or other portions of the application.
Sincerely,
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
cc: Mr. Eric Kulz, NC DWQ Raleigh Regional Office
?QF N NA r`Z9 Michael F. Easley, Governor
`Q tri William G. Ross Jr., Secretary
Co r North Carolina Department of Environment and Natural Resources
0 Alan W. Klimek, P.E. Director
Division of Water Quality
April 22, 2005
DWQ Project # 05-0613
Wake County
CERTIFIED MAIL: RETURN RECEIPT REQUESTED
D. R. Horton
2000 Aerial Center Parkway, Suite 110
Morrisville, NC 27560
Subject Property: West Lake Subdivision
REQUEST FOR MORE INFORMATION
On April 11, 2005, the Division of Water Quality (DWQ) received your application dated April
11, 2005 to impact 0.248 acres of wetlands, 8,946 square feet of permanent impact to Zone 1 of
the Neuse River Buffers and 1,356 square feet of temporary impact to Zone 2 Neuse River
Buffers to construct the proposed residential subdivision. The DWQ has determined that your
application was incomplete and/or provided inaccurate information as discussed below. The
DWQ will require additional information in order to process your application to impact protected
wetlands and/or streams on the subject property. Therefore, unless we receive the additional
information requested below, we will have to move toward denial of your application as required
by 15A NCAC 2H.0506 and will place this project on hold as incomplete until we receive this
additional information. Please provide the following information so that we may continue to
review your project.
Additional Information Requested:
1. Impervious Surface Area
Please provide detailed breakdown of impervious surface areas
Please respond within three weeks of the date of this letter by sending this information to me in
writing and Eric Kulz or Mike Horan of the DWQ Raleigh Regional Office. If we do not hear
from you within three weeks, we will assume that you no longer want to pursue this project and
we will consider the project as withdrawn.
This letter only addresses the application review and does not authorize any impacts to wetlands,
waters or protected buffers. Please be aware that any impacts requested within your application
are not authorized (at this time) by the DWQ. Please call Ms. Cyndi Karoly or Mr. John Dorney
401 Oversight/Express Review Permits Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650
2321 Crabtree Boulevard, Suite 250, Raleigh, North Carolina 27604
Phone: [phone] /FAX [phone]/ Internet: http://h2o.enr.state.nc.us/ncvvetlands
None hCarolina
Naturally
An Equal Opportunity/Affirmative Action Employer - 50% Recycled/10% Post Consumer Paper
05061,8
April 11, 2005
Civil Engineering & Planning
Mr. Kevin Yates
US Army Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
QM @02adR ?
APR 1 1 2005
Ms. Cyndi Karoly DENR-WATER QUALITY
NC Division of Water Quality WETLMANO STORMWATER BRANCH
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Re: Pre-Construction Notification Application Form for West Lake Subdivision -
Phase 1, in Cary, NC (WakeCounty)
Dear Mr. Yates and Ms. Karoly,
Attached is the completed PCN Application Form for proposed wetland, surface water,
and Neuse River Buffer impacts required for West Lake Subdivision - Phase 1 (PIN
0679.01-27-9795) in Cary (Wake County). The site covers 89.9 acres (Phase 1
43.1 acres), northeast of the intersection of West Lake Road and Optimist Farm Road and
is in the Neuse River Basin. Jurisdictional wetlands on this site were delineated and an
on-site meeting was held with Ms. Jennifer Burdette on October 7, 2004. On September
16, 2004, Ms. Debbie Edwards of NC DWQ conducted a Neuse River Buffer
concurrence meeting and issued a buffer determination (DWQ EXP# 04-1508). A site
plan labeled "West Lake Subdivision - Wetland, Surface Water, and Neuse River Buffer
Impact Map (Drawing Sheet WL-1.0)" is attached to illustrate proposed impacts.
Proposed impacts in Impact Area #1:
Neuse River Buffer Impacts - Zone 1 4451.76 sgft (0.1022 ac)
Neuse River Buffer Impacts - Zone 2 4493.58 sgft (0.1033 ac)
Wetland Impacts 6655.44 sgft (0.1528 ac)
Surface Water Impacts 1998.92 sgft (0.0459 ac)
The proposed impacts are required for the installation of a street, storm drainage, lot
grading, and the installation of a Town of Cary required 10' concrete multi-use trail. The
position of the street is dependent on the Town of Cary requirement that the street begin
directly opposite the street across West Lake Road.
Proposed impacts in Impact Area #2:
Wetland Impacts
1611.48 sgft (0.0370 ac)
The proposed impact is required for the installation of a street and a Town of Cary
required greenway easement.
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
Proposed impacts in Impact Area #3:
Neuse River Buffer Impacts - Zone 1 86.27 sgft (0.0020 ac)
Temporary Neuse River Buffer Impacts - Zone 2 1351.95 sqft (0.0310 ac)
Wetland Impacts 2290.71 sqft (0.0526 ac)
The proposed impacts are required for the installation of a sanitary sewer that will
provide sewer access to half of the lots in the subdivision. The wetland area was crossed
in a perpendicular manner at one of its narrowest points. The sanitary sewer was also
positioned to completely eliminate stream impacts.
Please do not hesitate to contact me if you have questions, comments or concerns about
this application. Thank you in advance for your time spent reviewing this permit
application.
Sincerely,
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
?19@30vtl P
APR 1 Y 2005
Office Use Only: DENR - WATER QUALITY Form Version May 2002
WETLANDS AND f ATER BRANCH 050613
USACE Action ID No. DW No.
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
I. 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
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide Permit #39
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 Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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 details), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: D. R. Horton
Mailing Address: 2000 Aerial Center Parkway
Suite 110
Morrisville, North Carolina 27560
Telephone Number: 919.460.2995 Fax Number: 919.469.5406
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: Shawn Guyer
Company Affiliation: Spaulding & Norris, PA
Mailing Address: 972 Trinity Road
Raleigh, North Carolina 27607
Telephone Number: 919.854.7990 Fax Number: 919.854.7925
E-mail Address: shawn@,?pauldingnorris.com
Page 5 of 13
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: Westlake Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0679.01-27-9795
4. Location
County: Wake Nearest Town: Holly Springs, NC
Subdivision name (include phase/lot number): Westlake Subdivision Phase 1
Directions to site (include road numbers, landmarks, etc.): Traveling South on US-401 from
US-40/440, go 7.4 miles. Turn right onto Ten-Ten Road, travel 3.7 miles. Turn left onto
West Lake Road, travel 1.4 miles. Site is on left (.east) side of road before the intersection of
West Lake Road and Optimist Farm Road.
5. Site coordinates, if available (UTM or Lat/Long): 78.75278 West (Lon ig tude),
35.66937 North (Latitude)
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 85.90 acres total (Phase 1 - 43.1 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): Bells Lake (Index # 27-43-15-6:
Classification C.NS)D
8. River Basin: Neuse (Subbasin # 03-04-03: USGS Cataloging Unit: 03020201)
(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/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site landuse is comprised of field/pasture and mixed
woodland. There are public schools located to the west of the site, residential subdivisions to
the north and east of the site, and a school and residential subdivision to the south.
10. Describe the overall project in detail, including the type of equipment to be used: The
project entails the development of a residential subdivision and the associated infrastructure,
including: roads, water supply, and sanitary and storm sewers. Equipment used will include,
but is not limited to trackhoe excavators, bulldozers, rollers, asphalt pavers, and other
grading and road construction equipment.
11. Explain the purpose of the proposed work: The purpose of the proposed work is to provide
the necessary infrastructure to support a residential subdivision of single family homes
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.
This is the first permit application for this site. Ms. Debbie Edwards of NC DWQ conducted a
Neuse River Buffer concurrence meeting on September 16, 2004. A site visit was conducted
with Ms. Jennifer Burdette of the USACE on October 7, 2004.
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.
The Owner anticipates submittal of a permit request for Phase 2 of the site.
Page 7 of 13
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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: The proposed impacts include
permanent and temporary impacts to wetlands, surface waters, and Neuse River Buffers resulting
from lot fill, a road crossing, and the installation of a sanitary sewer.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain**
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.1528
No
0 (to pond)
Freshwater marsh
Impact Area #2 Road grading &
greenway 0.0370 No 425 Forested Wetland
Impact Area #3 Sanitary sewer 0.0526 No 25 Forested Wetland

' List each impact separately and identify temporary impacts. hnpacts 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.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http://www.fema.gov.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 1.4668 Acres
Total area of wetland impact proposed: 0.2480 Acres
Page 8 of 13
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
indicate on ma
Type of Impact* Length of
Impact
linear feet
Stream Name* * Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)
None

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, 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.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.uses.aov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mapquest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: N/A
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact's Area of
Impact
acres Name Waterbody
)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.

Impact Area # 1 Lot grading, road
grading, & storm
drainage
0.0459
unnamed
Farm Pond

List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
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.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local storlnwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
Page 9 of 13
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.
The project layout was specifically designed to avoid and minimize potential impacts to
streams wetlands surface waters and Neuse River Buffers as shown on sheet WL-1 0 "West
Lake Subdivision - Wetland, Surface Water, and Neuse River Bu er Impact Map ". Impact Area
#1, the roadway crossing the small pool, the wetland area, and the upper end of the pond,was
positioned based on Town of Cary requirements. The Town of Cary required that Street A begin
directly across from the existing street on the opposite side of West Lake Road. Limitations of
curvature and lot positioning further hindered minimization of the impacts. Additionally, the
Town of Cary required the installation of a 10' wide concrete multi-use trail on the south side of
Street A.
The rg eenway easement resulting in the wetland impact at Impact Area #2 was required by the
Town of Cary. The easement and the street were shifted as far as possible away from the
wetland to minimize the wetland impact.
The sanitary sewer at Impact Area #3 was required to provide sewer access to almost half of the
lots in the subdivision. The wetland area was crossed in a perpendicular manner at one of its
narrowest points. The sanitary sewer was also positioned to completely eliminate stream
impacts.
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.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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.
Page 10 of 13
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 NCWRP 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/ncwetiands/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 offske), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The owner does not propose any mitigation for the project.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): None
Amount of buffer mitigation requested (square feet): None
Amount of Riparian wetland mitigation requested (acres): None
Amount of Non-riparian wetland mitigation requested (acres): None
Amount of Coastal wetland mitigation requested (acres): None
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
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 ?
Page I 1 of 13
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.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
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
(square feet Multiplier Required
Mitigation
1 4452 Perm 3
2 (4494 Perm, 1352 Temp) 1.5
Total (8946 Perm, 1352 Temp)
Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or. 0260.
No buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
Page 12 of 13
There are 0. 13 acres of impervious area from existing structures on the 43.10 acre property. The
proposed development includes 5.05 acres of impervious surfaces, comprised of streets and
sidewalks. These surfaces account for approximately 11.7% of the overall site area, allowing fo
an additional 7.88 acres of impervious surfaces for buildings, driveways, walkways and patios
before the 30% impervious area threshold is reached. The remaining 7.88 acres of impervious
surfaces would allow for approximately 4,575 square feet of impervious area per lot. The
impervious area for the average house on each lot is estimated at approximately 2,200 square feet
leaving 2,375 square feet of additional impervious area for driveways, walkways, and patios.
2,375 square feet greatly exceeds the area estimated for those uses.
XH. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Wastewater generated from the proposed project will be collected by the Town of Cary sanitary
sewer system and treatment will be provided at the Town of Cary Middle Creek Wastewater
Treatment Facility.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H.0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
XIV. 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).
Cy. (I , Z-065
ApplicantQigent's Signature / Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
Civil Engineering & Planning
AGENT AUTHORIZATION FORM
ALL BLANKS TO BE FILLED IN BY CURRENT LANDOWNER
Name: 1 ?) R ro A)
Address: 2cbo ('
0?
A Pig 10 \1 i - 11 \0- . z 75 . AL Phone: q 1 c1 -Itr0 - Z9 q 5
Project Name/Description: Westlake Subdivision / Residential development
Date: 1(p hfiAe L Z00_
The Department of the Army
US Army Corps of Engineers
Wilmington District
PO Box 1890
Wilmington, NC 28402-1890
Attn: Mr. Kevin Yates
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting & Permitting
To Whom It May Concern:
I, the current property owner, hereby designate and authorize Spaulding & Norris, P.A.,
to act on my behalf as my agent in the processing of permit applications, to furnish upon
request supplemental informat'on in support of applications, etc., from this day forward.
This the ?(D day of ZW O
This notification supercedes any previous correspondence concerning the agent for this
project.
bkvl b &-rlf?mowlsw
PRINT Owner's Name
PRO RTY Owner's Signature
Cc: Mr. John Dorney
NCDENR - Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607

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11010 Raven Ridge Road • Raleigh, North Carolina 27614 • Phone: [phone] • Fax: [phone] DATE
www.SandEC.com
JOB NAME 5 T L,0.I'? By _ 0. SdK ?qY!„? _
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RCDENR
North Carolina Department of Environment and Natural Resources
Division of Water O ality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
September 16, 2004
DWQ EXP # 04-1508
Wake County
D.R. Horton, Inc.
Attn: Britt Spivey
3939 Browning Place
Raleigh, NC 27609
Subject Property:

West Lake
UT to Middle Creek *303(d) listed waters
On-Site Determination for Applicability to the Neuse River Riparian Area Protection Rules
(15A NCAC 2B.0233)-EXPRESS REVIEW PROGRAM
Dear Mr. Spivey: \
On September 16, 2004, at your request 1-conducted an on-site. determination to review six (6)
features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC
2B .0233). The features are labeled as "A, B, C, D, E and F" on the attached maps initialed by
me on September 16, 2004.
The Division of Water Quality (DWQ) has determined that the features labeled as "A, B
and C" on the attached maps are subject to the Neuse Buffer Rule. The origins have been
delineated In the field and flagged. The feature on the west side of the property includes
three ponds and two stream segments that connect them. Pond A and B are. both subject,
the segment between pond A and B is subject from flag E134 through to flag E118. The
segment below pond B, which Is identified as E is not subject. Pond F is not connected and
therefore is not subject. Feature C is subject from flag SOI through to the eastern
property boundary. Feature D is not subject. These features and their associated buffers
should be identified on any future plans for this property. The owner (or future owners) should
notify the DWQ (and other relevant agencies) of this decision in any future correspondences
concerning this property. This on-site determination shall expire five (5) years from the date of
this letter.
Landowners or affected parties that dispute a determination made by the DWQ or Delegated
Local Authority that a surface water exists and that it is subject to the buffer rule may request a
determination by the Director. A request for a determination by the Director shall be referred
the Director in writing c/o John Dorney, DWQ Wetlands/401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604-2260. Individuals that dispute a determination by the bWQ or Delegated
401 Wetlands Certification Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650 One
2321 Crabtree Boulevard, Suite 250, Raleigh, NoreCarorara 27604 North Carolina
Phone: [phone]/ FAX [phone]/ Internet htto:/lh2o.enr.state.nc.us/ncwetlands Nightrallff
An Equal opporhmity/Affirmative Action Employer-50% Recyc?ed/10% Post Consumer Paper
9/16/04
Local Authority that "exempts" a surface water from the buffer rule may ask for an adjudicatory
hearing. You must act within 60 days of the date that y_ou receive this letter. Applicants are
hereby notified that the 60-day status orv appeal time does not start until the affected party
(including downstream and adjacent landowners) is notified of this decision. DWQ recommends
that the applicant conduct this notification in order to be certain that third party appeals are made
in a timely manner. To ask for a hearing, send a written-petition, which conforms to Chapter
150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, N.C. 27699-6714. This determination is final and binding unless you
ask for a hearing within 60 days.
This letter only addresses the applicability to the buffer rules and. does not approve any activity
within the buffers. Nor does this letter approve any activity within Waters of the United States
or Waters of the State. If you have any additional questions or require additional information
please call Debbie Edwards at [phone].
Sincerely,
Alan k. Klimek, P.E.
AWK/dae
Attachments: Wake County Soil Survey map
USGS Apex Quad map
cc: Mike Horan, DWQ Raleigh Regional Office
File Copy
Central Files
Jason Payne-S&EC
Filename 041508WestLake(Wake)EXP+origin
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Figure 1- USGS Map
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Elam, Todd, & d'Ambrosi
Wake County
Apex Quadrangle
SEP 1 0 2004
WATER QUALITY SEGTft
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone].[phone]
Web Page: www.SandEC.com
M..

1 8378X1 1 1:15840
Mgr,: Sc
12/17/03
Figure 2 - Soil Survey
West Lake
Elam, Todd, & d'Ambrosi
Wake County
Sheet 84
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com
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WAKE COUtITY, NORTH CAROLINA - SHEET NUMBER 84
??„

Project 1:
8378.W1 Scale:
1:15M
project bate: Figure 2 - Soil Survey
M9r.: Sc West Lake
12/17/03 Elam, Todd, & d'Ambrosi
Wake County
Sheet 84
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com
\ _ I
SPAULDING & NORRIS PA
Planning ? Civil Engineering ? Environmental
STORMWATER
AND
EROSION CONTROL
CALCULATIONS
FOR
WEST LAKE SUBDIVISION

I' PHASE I - SINGLE FAMILY
NORTH CAROLINA
ARY
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Prepared for:
D.R. Horton, Inc.
2000 Aerial Center Parkway
Suite 110
Morrisville NC 27560
Submitted By:
Spaulding & Norris, PA
972 Trinity Road
Raleigh, North Carolina 27607
Office [phone]
Fax [phone]
REVISED DATE: 5-31-05
DATE: 03-04-05
PROJECT: 556-05

Q
JUG 2 0 2005
pg AND ST FOR ATER BAH
Phone: [phone] • Fax: [phone] Trinity Road * Raleigh, North Carolina 27607
'1
Table of Contents
Section Page
Introduction, Methodology, Nitrogen
Reduction, and Conclusion 1-2
Nitrogen Control Calculations 3-5
Pond 1 Design Calculations 6-14
Pond 2 Design Calculations 15-23
Pond 3 Design Calculations 24-32
Pond 4 Design Calculations 33-40
Gutter Spread Design Data Sheet and Calculations 41-85
Hydraulic Grade Line Calculations 86-116
Channel "A" Calculations 117-118
Attachments:
Exhibit 1- Catch Basin Drainage Area Delineation Map
Exhibit 2 - Pre-Developed Sediment Basin Drainage Area Delineation
Map

t I. Introduction
' The proposed West Lake subdivision is located at the intersection of West Lake Road and
Optimist Farm Road in Cary, North Carolina. The subdivision proposes to create 75
single family lots on a 43.1 acre tract. The development is subject to the Neuse River
Basin Nitrogen Reduction Rules.
The Neuse River Basin Nitrogen Reduction Rules state that in addition to nitrogen
reduction requirements, the post-developed one-year storm peak flow must be detained
I!' and released at a rate equal to or less than the pre-developed one year storm peak flow.
Through the use of on-site detention ponds, the 1-year storm will be detained and released
at a rate less than the pre-developed levels.
H. Methodology
All stormwater from the proposed storm drainage collection systems will discharge into a
detention pond. There are a total of four ponds proposed for the project. The ponds are
designed to detain the 1-year storm and to release the storm water at a rate less than the
pre-developed levels. The ponds are designed to safely pass the 100-year storm event
through an emergency spillway without overtopping the pond, while maintaining a
minimum of 12" freeboard.
The rational method was used to calculate the peak stormwater rates as follows:
Rational Method Q = ciA
Q = Peak stormwater runoff rate (cfs)
c = Runoff coefficient
i = Rainfall intensity, based on storm event selected (in./hr.)
A = Drainage area (ac.)
Pond calculations were completed using "Hydraflow Hydrographs 2000" software by
Intellisolve. Hydrographs were created for the pre-developed and post-developed
conditions, for the 1-year, 10-year and the 100-year storms. Pond data consisting of
contour surface areas and outlet structure specifications was input, and the post-developed
hydrographs routed through the ponds. Each pond outlet structure consists of a 15" rcp
outlet, which are designed to release the 1-year storm at a rate less than the pre-developed
levels. Emergency spillways are included, which are designed to pass the 100-year storm
without overtopping the pond while maintaining 12" freeboard.
1I
II ?
III. Nitrogen Reduction
Three of the four stormwater detention ponds are located adjacent to a Neuse River
riparian buffer. These ponds will release stormwater through a level spreader, which will
create diffuse flow through the riparian buffer.
Total nitrogen export from site after BMP devices = 4.53 lbs/ac/yr
(Please see attached nitrogen calculation worksheet)
Buydown is required since total nitrogen export is more than 3.6 lbs/ac/yr. The Buydown
payment amount will be $13,000.00.
IV. Conclusions
Stormwater Runoff Rate Summary:
Pond # Pre-developed Peak Flow (cfs) Post-developed Peak Flow (cfs) Routed Flow From Pond (cfs)
1-year 1-year 1-year
1 5.57 6.96 2.15
2 13.52 24.58 2.99
3 7.08 14.15 2.14
4 2.21 5.42 0.54
2
v

Nitrogen Control Calculations
'1

I Nitrogen Control Plan
Residential Subdivisions with no known buildlarg footprints.
IESr
Project Title:
Part 1. Riparian Buffers
Area includes riparian buffers? [ ] No X Yes [ ]Exempt
If yes, K50 foot 100 foot
River Basin? Neuse [ ] Cape Fear
Basis for exemption
Show buffers on site plan.
Part II. Nitrogen Calculations (Method 1, Appendix C):
a. Subdivision information:
Number of lots 75 Average house size Z Ztx? 5r
Number of lots / acre 17-1 (&W-0 oN ToTRL A96A Amount of Right-of-Way (o , z (o AL-
Total area of lots (excluding Percent of Right-of-Way
R/W and open space) 2 0, 2-`1 A-- that is impervious area 7
d1o
Average lot size iZwocy SP Total estimated impervious area 32s?nQ?n tF
b. Pre-development loadino:
Type of Land Cover
Permanently protected undisturbed open
space (forest, unmown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
Impervious Area
TOTAL
TN export
Area TN export coeff. from use
(acres) (Ibs/ac/yr) (Ibs/yr)
-Z -7,'75 0.60 1( .(6Z.
5.40 1.20 If?,yfh
21.20
N3.td 10
Nitrogen Loading Rate (Ibs/ac/yr)
' c. Post-development loading:
Type of Land Cover
Permanently protected undisturbed open space
(forest, unmown meadow)
Permanently protected managed open space
(grass, landscaping, etc.)
II!' Right-of-Way (read TN export from Graph1)
Lots (read TN export from Graph 2)
TOTAL
Nitrogen Loading Rate (Ibs/ac/yr) = 113. 10 s y' S3
Nitrogen Load after BMPs = 4,53
I" , 7 ca e)
Nitrogen Load Offset by Payments = 11.5 - ?. is = o , q x -33<) x 143
Net change in on-site N Load= 4,3.'72- P
Part III. Control of Peak Stormwater Flow_
Calculated Pre-development Peak Flow' 5,57 X3.5 7.0$ ; 2.2t
Calculated Post-develo ment Peak Flow 2.5 5-30 2,4S
P ?.hy
I, the undersigned, certify to the best of my knowledge that the above information is correct (affix seal).
' Supply notes & details showing control of Nitrogen and peak stormwater runoff.
`f
TN export
Area TN export coeff. from use
(acres) (Ibs/ac/yr) (Ibs/yr)

X0.21 0.60
?_t3

2,3q 1.20
Z.?7
fo. 2 (o IS,5 ey. S1
LA IV I. 'St '
x-{3.1 195.32
Graphs for use with Method 1: Resideni::fl Sites with no known building footprints.
Graph 1: Total Nitrogen Export from Right-of-Way
{--?z
0% 20% 40% 60% ^ 80% 100% 120%
Percentage of Right-of-Way that Is Pavement
"15.1
20.(
?a
J3 15.(
C13•S
L'
i 10.(
W
Z
0.(
Graph 2: Total Nitrogen Export from Lots
Total MtroW Export from tots
12.00
1x00
&00
i
w
e
£ 8.00
u. 2
4.00
zoo
0.00
3,01
-7 5 LOTS
ZIA, ?A1 Ac_ ?, O 9 vu 115'a c
S
t

Pond 1 Design Calculations

11
SPAtIULDINO & NOR
`7
Sheet No. of
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Date _ ..--
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Hydrograph Plot
Hydrallow Hydrographs by Intelisolve
' Hyd. No. 1
POND #1 - PRE-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 3.8 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf

Peak discharge = 5.57 cfs
Time interval = 1 min
Runoff coeff. = 0.32
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 1,670 cuft

s
1 - Rational -1 Yr - Qp = 5.57 cfs
46

I
3

i
0 1 2 3 4 5 6 7 8 9 1
Time (min)
/ Hyd. 1

9
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hy_d. No. 2
POND 1 POST-DEV
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 3.8 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf
Peak discharge = 6.96 cfs
Time interval = 1 min
Runoff coeff. = 0.4
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 2,088 cuft
2 - Rational -1 Yr - Qp = 6.96 cfs
8
CJ
0 1 2 3 4 Time ( 5 (min) 6 7 8 9 10
/ Hyd.2

s
4

2

0
10

Reservoir Report
Page 1
Hydraflow Hydrographs by Inteiisolve
Reservoir No. 1 - POND 1
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
stage (it) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 401.80 692 0 0
0.20 402.00 967 186 186
1.20 403.00 1,371 1,169 1,355
2.20 404.00 3,025 2,198 3,553

Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [Bl [Cl [D]
Rise in = 15.0 15.0 0.0 0.0 Crest Len It = 6.28 10.00 0.00 0.00
Span In = 15.0 15.0 0.0 0.0 Crest El. it = 403.40 403.90 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert El. It = 401.80 401.80 0.00 0.00 Weir Type = Riser Rect - -
' Length it = 20.0 0.0 0.0 0.0 Multi-Stage = Yes No No No
Slope % = 0.50 0.00 0.00 0.00

' N -Value = .013 .013
Orif. Coeff. = 0.60 0.60 .000 .000
0.00 0.00
Multistage = We Yes No No Exilltration Rate s 0.00 in/hr/sqR Teilwater Elev. = 0.00 R
Nate: All outflows have been analyzed under inlet and outlet control.
' Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv a Clv C Civ D Wr A Wr B Wr C Wr D Exfil Total
it cult It cfs cfs cis cis cis cfa cis cfs cis cis

I' 0.00 0 401.80 0.00 0.00 - - 0.00 0.00 - - - 0.00
0.20 186 402.00 0.13 0.13 - - 0.00 0.00 - - - 0.13
1.20 1,355 403.00 2.10 2.10 - - 0.00 0.00 - - - 2.10
2.20 3,553 404.00 6.92 1.70 - - 5.22 1.05 - - - 7.97

1 II
Hydrograph Plot
Hydraflow Hydrographs by Irdellsolve
Hyd. No. 3
POND 1
Hydrograph type = Reservoir
Storm frequency = 1 yrs
Inflow hyd. No. = 2
Max. Elevation = 403.05 ft
SW *p Imkofi n MWMd LOW.
Peak discharge = 2.15 cfs
Time interval = 1 min
Reservoir name = POND 1
Max. Storage = 1,457 cuft
Hydrograph volume - 2,088 curt
3-Reservoir-1 Yr-Qp=2.15ds
8
A

0.0 10.2 20.4 30. .0
Time (min)
Hyd. 2 Hyd. 3

s

4
2

0
6 40 .8 51.0 61 .2 71 .4 81.6 94.8 102
Iz

Hydrograph Plot
Hydraflow Hydrographs by Intellsolve
Hyd. No. 3
POND 1
Hydrograph type = Reservoir
Storm frequency = 10 yrs
Inflow hyd. No. = 2
Max. Elevation = 403.46 ft
Peak discharge = 3.43 cfs
Time interval = 1 min
Reservoir name = POND 1
Max. Storage = 2,361 cuft
SWMe Mdk xWn m&sod used.
Hydrograph Volume = 3,334 cuft
3 - Reservoir -10 Yr - Qp = 3.43 dfs
15
10
CY
0 9 18 27 36 45 54 63 72 81 90
Time (min)
/ Hyd. 2 / Hyd. 3

5
0
13
'Hydrograph Plot
Hydraflow Hydrographs by IntelisoW
Hyd. No. 3
POND 1
Hydrograph type = Reservoir
Storm frequency = 100 yrs
Inflow hyd. No. = 2
Max. Elevation = 403.76 ft
Peak discharge = 5.72 ds
Time interval = 1 min
Reservoir name = POND 1
Max. Storage = 3,019 cuft
Swap WWWW method used.
Hydrograo volume - 4,487 curt
3 - Reservoir -100 Yr - Qp = 5.72 dfs
15-
10
v
Cl
0.0 7.6 15.2 22.8 30.4 38.0 45.6 53.2 60.8 68.4 76.0
Time (min)
/ Hyd.2 / Hyd. 3

5
0

Pond 2 Design Calculations
1s
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+ + + + + + +
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+ + + + + ++ + + ++ + + + a
E 111111111/ +++++++++, +++ + + + + ++.
% 1 I I`11 111) I Ic \_-? +++,++ ++++++++++++++++++f+++
1111\11111 1 Z+ \?? ++++ +++++++ +'+i
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Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 4
POND 2 PRE-DEV. 1
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 13.6 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf
Peak discharge = 13.52 cfs
Time interval = 1 min
Runoff coeff. = 0.22
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 4,056 cult
4 - Rational -1 Yr - Qp =13.52 cfs
15
10
CY
5
0
0 1 2 3 4 5 6 7 8 9 10
Time (min)
/ Hyd.4
is
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 5
POND 2 POST-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 13.6 ac
Intensity = 4.519 in/hr
OF Curve = WakeCounty.idf
Peak discharge = 24.58 cfs
Time interval = 1 min
Runoff coeff. = 0.4
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 7,375 cuft
5 - Rational -1 Yr - Qp = 24.58 cfs
25
20
15
CY 10-
5-
0,
0 1 2 3 4 5 6 7 8 9 10
Time (min)
/ Hyd.5

III

Reservoir Report
Page ,
Hydraflow Hydrographs by IMellsolve
Reservoir No. 2 - POND 2
Pond Data
Pond storage is based on known contour areas. Average end area method used.

' Stage / Storage Table
stage (ft) Elevation (ft) Contour area (sqR) Incr. Storage (cuR) Total storage (cuR)
II
I 0.00 362.00 3,465 0 0
I 1.00 363.00 4,267 3,866 3,866
2.00 364.00 5,128 4,698 8,564
3.00 365.00 8,577 6,853 15,416

1 Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
' Rise in = 15.0 15.0 0.0 0.0 Crest Len R = 6.28 10.00 0.00 0.00
Span in = 15.0 15.0 0.0 0.0 Crest El. R = 363.60 364.10 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coen. = 3.33 3.33 0.00 0.00
' Invert El. R = 362.00 362.00 0.00 0.00 Weir Type = Riser Red - -
Length R = 32.0 0.0 0.0 0.0 Multi-Stage = Yes No No No
slope % = 0.50 0.00 0.00 0.00
N -Value = .013 .013 .000 .000
' orif. Coen. = 0.60 0.60 0.00 0.00
Muld-stage = n/a Yes No No ExRRratlon Rate ¦ 0.00 INhr/sqR Tailwater Elev. = 0.00 R
Note: All ouNOwc have been analyzed under inlet and outlet control.
' Stage /Storage /Discharge Table
Stage Storage Elevation Civ A CN B Clv C Clv D Wr A Wr B Wr C Wr D ExRI Total
R cuR R cis cis cis cis cfs cis cis cis cis cis
0.00 0 362.00 0.00 0.00 - - 0.00 0.00 - 0.00
1.00 3,866 363.00 2.01 2.01 0.00 0.00 - - 2.01
2.00 8,564 364.00 5.85 2.06 -- - 3.79 0.00 -- - - 5.85
3.00 15,416 385.00 9.05 0.87 - - 8.16 28.43 - - - 37.47
1
1 Z
Hydrograph Plot
Hydraflow Hydrographs by fMellsolve
Hyd. No. 6
POND 2 ROUTING
Hydrograph type = Reservoir
Storm frequency = 1 yrs
Inflow hyd. No. = 5
Max. Elevation = 363.56 ft
Peak discharge = 2.99 cfs
Time interval = 1 min
Reservoir name = POND 2
Max. Storage = 6,474 cult
Mm"s WWabw MWW wed.
Hydrograph Vdume = 7,375 cult
6 - Reservoir -1 Yr - Qp = 2.99 cfs
25-
20-
15
v
C1 10
5
0
0.0 0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0
Time (hrs)
/ Hyd. 5 / Hyd.6
71
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 6
POND 2 ROUTING
Hydrograph type = Reservoir Peak discharge = 7.71 cfs
Storm frequency = 10 yrs Time interval = 1 min
Inflow hyd. No. = 5 Reservoir name = POND 2
Max. Elevation = 364.20 ft Max. Storage = 9,918 cuft
8kxzpe hdk:Won ..wU wed. Hydrograph Volume =11,777 cult
6-Reservoir -10Yr-Qp=7.71 ds
40
30
20
C'1
10
0
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Time (hrs)
/ Hyd. 5 / Hyd.6
2 2.
Hydrograph Plot
Hydraflow HHydrographs by Irdellsolve
Hyd. No. 6
POND 2 ROUTING
Hydrograph type = Reservoir
Storm frequency = 100 yrs
Inflow hyd. No. = 5
Max. Elevation = 364.53 ft
Peak discharge = 17.33 cfs
Time interval = 1 min
Reservoir name = POND 2
Max. Storage = 12,217 cult
Skmp hldICOW med*d U6W.
Hydrograph Volume =15,851 cuft
6 - Reservoir -100 Yr - Qp =17.33 ds
60
50
40
as
30
C1
20-
10
0
0.0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Time (hrs)
/ Hyd. 5 / Hyd. 6
23
Pond 3 Design Calculations
zit

'

SPAULDING & NQRRiS, i.^
Cavil Filgincering & Planninn- = --
Shcet No. ol-
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\ \\\ \ ? ?-'___ `\\ 1 1111 1V\\ ??? ti r/ / // !
\ \\\ // ///// 385 r
cz \\
.++.++++ / I / .++ a +.+++.++.+
+ + + a + + + a
+ + + a +++++ a++ + + ++++ + lt\ \I { __t`
04 + +++++ + +++ +++++? a + + +
s + r
`+ + I?' ! 1 !1111 Ix II
+ + + + + I?/? 1
+a++ « ??;"' ++ +++++++++ + I1 I?-II111 '
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+ ++ + ii+ + +++ +a + 111 11 1
a .... + + + +
+++«++ "++, +++++ ++«++++
\1 i I /r? Y 111 \? I r
+ + + + + +++y ++, +++ + + +++++++ it 1 1
+ + + + + , h + , ++ , + . . . . .. , . . . a . . . +
/ + ++ + + + + r + ++ + + + + + + + a + + + n -? it
+ + ++ +
1111 - +++++ ,++++++++ +++«+ ++ ++ h ++ +, ++ +
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 7
POND 3 PRE-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 7.8 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf
Peak discharge = 7.08 cfs
Time interval = 1 min
Runoff coeff. = 0.2
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 2,123 cult
7 - Rational -1 Yr - Qp = 7.08 cfs
8
N
V
CI
0or
0 1 2 3 4 Time ( 5 (min) 6 7 8 9 10
/ Hyd.7

s
4
2
0
L7
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 8
POND 3 POST-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 7.8 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf
Peak discharge = 14.15 cfs
Time interval = 1 min
Runoff coeff. = 0.4
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 4,246 cult
8 - Rational -1 Yr - Op =14.15 cfs
15-
10-
1102
CJ
0 1 2 5 6 8 9 10
3
Time (min)
/ Hyd. 8

4 5
0
7
ZS
Reservoir Report Page 1
Reservoir No. 3 - POND 3 Hydraflow Hydrographs by Intelisolve
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 367.00 3,087 0 0
1.00 368.00 3,792 3,440 3,440
2.00 369.00 4,555 4,174 7,613
3.00 370.00 8,577 6,566 14,179
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] ICI [D]
Rise in = 15.0 15.0 0.0 0.0 Crest Len ft = 6.28 10.00 0.00 0.00
Span in = 15.0 15.0 0.0 0.0 Crest El. It = 368.60 369.10 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coefl. = 3.33 3.33 0.00 0.00
Invert El. ft = 367.00 367.00 0.00 0.00 Weir Type = Riser Rect - -
Length ft = 32.0 0.0 0.0 0.0 Multi-Stage = Yes No No No
Slope % = 0.50 0.00 0.00 0.00
N -Value = .013 .013 .000 .000
OrM Coeff. = 0.60 0.60 0.00 0.00
Multi-Stage = n/a Yes No No Exflltration Rate ¦ 0.00 in/hr/sqft TalM*er Elev. = 0.00 ft
Note: All ouUbws have been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation CN A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfll Total
It cult It cis cis cis cis cis cis cfs cis cis cis
0.00 0 367.00 0.00 0.00 - - 0.00 0.00 - - - 0.00
1.00 3,440 368.00 2.01 2.01 - - 0.00 0.00 - - - 2.01
2.00 7,613 369.00 5.85 2.06 - - 3.79 0.00 - - - 5.85
3.00 14,179 370.00 9.05 0.87 - - 8.16 28.43 - - --- 37.47
Z q
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 9
POND 3
Hydrograph type = Reservoir
Storm frequency = 1 yrs
Inflow hyd. No. = 8
Max. Elevation = 368.06 ft
Peak discharge = 2.14 cfs
Time interval = 1 min
Reservoir name = POND 3
Max. Storage = 3,677 cuft
SWrne Indkebw nwe*d used.
Hydrograph Volume = 4,246 tuft
9-Reservoir-1 Yr-Qp=2.14ds
15
10
v
C1
5
0
0.0 0.6 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4 6.0
Time (hrs)
/ Hyd. 8 / Hyd. 9
36
Hydrograph Plot
Hydraflow Hydrographs by UdelWve
Hyd. No. 9
POND 3
Hydrograph type = Reservoir
Storm frequency = 10 yrs
Inflow hyd. No. = 8
Max. Elevation = 368.58 ft
Peak discharge = 3.08 cfs
Time interval = 1 min
Reservoir name = POND 3
Max. Storage = 5,871 cult
Sk"pe kAft on method wed.
Hydrograph Volume = 6,781 curt
9-Reservoir -10Yr-Qp=3.08ds
25-
20-
15
v
Cl 10
5
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Time (hrs)
/ Hyd.8 / Hyd. 9
3)
Hydrograph Plot
Hydraflow Hydrographs by Irrtellsolve
Hyd. No. 9
POND 3
Hydrograph type = Reservoir Peak discharge = 5.89 cfs
Storm frequency = 100 yrs Time interval = 1 min
Inflow hyd. No. = 8 Reservoir name = POND 3
Max. Elevation = 369.01 ft Max. Storage = 7,672 cuft
$tCrwpe hW aftn meUwd used. Hydrograph volume = 9,128 cult
9 - Reservoir -100 Yr - Qp = 5.89 dfs
40-
30-
20
10
O L-
0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0
Time (hrs)
/ Hyd. 8 / Hyd. 9
3 Z.

Pond 4 Design Calculations
33
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 10
POND 4 PRE-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 3.0 ac
Intensity = 4.519 in/hr
IDF Curve = WakeCounty.idf
Peak discharge = 2.71 cfs
Time interval = 1 min
Runoff coeff. = 0.2
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 813 cuft
10 - Rational -1 Yr - Qp = 2.71 cfs
3.0
2.5
2.0
? 1.
(Y
1.
0.
0.00 1 2 0
Time (min)
/ Hyd. 10

4 5
0
5
5 6 7 8 9 1
3S
Hydrograph Plot
Hydraflow Hydrographs by Intelisolve
Hyd. No. 11
±O-: 4 POST-DEV.
Hydrograph type = Rational
Storm frequency = 1 yrs
Drainage area = 3.0 ac
Intensity = 4.519 in/hr
OF Curve = WakeCounty.idf
Peak discharge = 5.42 cfs
Time interval = 1 min
Runoff coeff. = 0.4
Time of conc. (Tc) = 5 min
Asc/Rec limb fact = 1/1
Hydrograph Volume = 1,627 cuft
11 - Rational -1 Yr - Op = 5.42 ds
s
5
4
(1
2
1
00 1 2 3 4 5 6 7 8 9 10
Time (min)
/ Hyd. 11
36
Reservoir Report Page ,
Hydraflow Hydrographs by Intelisolve
Reservoir No. 4 - POND 4
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
Stage (ft) Elevation (it) Contour area (sgft) Incr. Storage (cuft) Total storage (cult)
0.00 356.00 3,087 0 0
1.00 357.00 3,792 3,440 3,440
2.00 358.00 4,555 4,174 7,613
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise in = 15.0 15.0 0.0 0.0 Crest Len ft = 6.28 10.00 0.00 0.00
Span In = 15.0 15.0 0.0 0.0 Crest El. It = 357.60 358.10 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 3.33 0.00 0.00
Invert El. It = 356.00 356.00 0.00 0.00 Weir Type = Riser Rect - -
Length it = 27.0 0.0 0.0 0.0 Multistage = Yes No No No
Slope % = 0.50 0.00 0.00 0.00
N-Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multistage = n/a Yes No No Exflltration Rate w 0.00 INhr/sqft TalMoter Elev. = 0.00 ft
Note: All oulHows have been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv a Ch? C Clv D Wr A Wr B Wr C Wr D Exftl Total
it cult It cis cfs cis cis cis cis cis cis cis cis
0.00 0 356.00 0.00 0.00 - - 0.00 0.00 - - - 0.00
1.00 3,440 357.00 1.94 1.89 - - 0.00 0.00 - - - 1.89
2.00 7,613 358.00 5.90 2.08 - - 3.81 0.00 - - - 5.90
?7
Hydrograph Plot
Hydraflow Hydrographs by Intellsolve
Hyd. No. 12
POND 4 ROUTING
Hydrograph type = Reservoir
Storm frequency = 1 yrs
Inflow hyd. No. = 11
Max. Elevation = 356.43 ft
Peak discharge = 0.54 cfs
Time interval = 1 min
Reservoir name = POND 4
Max. Storage = 1,485 cult
SkxWV hwlc on .,W" wed.
Hydmgrao Volume =1,827 CA
12 - Reservoir -1 Yr - Qp = 0.54 ds
s
5
4
1402
v 3
CY
2
1
0
0.0 0.9 1.8 2.7 3.6 4.5 5.4 6.3 7.2 8.1 9.0
Time (hrs)
/ Hyd. 11 / Hyd. 12
38
Hydrograph Plot
Hydraflow Hydrographs by Intellsolve
Hyd. No. 12
POND 4 ROUTING
Hydrograph type = Reservoir
Storm frequency = 10 yrs
Inflow hyd. No. = 11
Max. Elevation = 356.67 ft
Peak discharge = 1.10 cl's
Time interval = 1 min
Reservoir name = POND 4
Max. Storage = 2,316 cuft
SWo" In Wdw anOwd wed.
Hydrograph Volume = 2,598 cuft
12 - Reservoir -10 Yr - Qp = 1.10 ds
10-
8
6
v
CY 4
2
0
0.0 0.8 1.6 2.4 3.2 4.0 4.8 5.6 6.4 7.2 8.0
Time (hrs)
/ Hyd. 11 / Hyd. 12
3 C1
Hydrograph Plot
Hydraflow Hydrographs by Intellsolve
Hyd. No. 12
POND 4 ROUTING
Hydrograph type = Reservoir
Storm frequency = 100 yrs
Inflow hyd. No. = 11
Max. Elevation = 356.89 ft
Peak discharge = 1.64 cfs
Time interval = 1 min
Reservoir name = POND 4
Max. Storage = 3,067 cult
scra pe IndkabW nwffod used.
Hydrograph Volume = 3,498 cult
12 - Reservoir -100 Yr - Qp =1.64 ds
15-
10
v
5
0
0.0 0.7 1.4 2.1 2.8 3.5 4.2 4.9 5.6 6.3 7.0
Time (hm)
/ Hyd. 11 / Hyd. 12
q6
1

Gutter Spread Design Data Sheet and Calculations

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FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0570
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 1.120
T Width of Spread (ft) 4.17
Gutter Flow

Eo Gutter Flow Ratio 0.907
d Depth o f Flow (ft) 0.16
V Average Velocity (ft /sec) 4.49
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 10.96 3.00 0.02 0.018 1.102
Parallel Bar P-1-7/8 2.00 2.90 0.92 1.013 0.089
Combination 0.92 1.031 0.089
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
Cl-Z
4b
Ili ' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
' Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0570
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.220
T Width of Spread (ft) 1.57
Gutter Flow
Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.09
V Average Velocity (ft/sec) 2.00
' Inlet Interception
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 5.27 3.00 0.03 0.007 0.213
' Parallel Bar P-1-7/8
Combination 2.00 2.90 1.00
1
00 0.213
0
220 0.000
0
000
. . .
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
G'
0 7
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0570
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.290
T Width of spread (ft) 1.74
Gutter Flow

Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.10
V Average Velocity (ft /sec) 2.64
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 5.92 3.00 0.03 0.009 0.281
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.281 0.000
Combination 1.00 0.290 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
4 `d
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements

i Inlets on Grade
Date: 02/24/2005
Pro ject No.
' Pro ject Name.:
Computed by
' Inlets on Grade: Curb Opening, Grat e Inlet
Roadway and Discharge Data

Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0570
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
' Q Discharge (cfs) 0.400
T Width of Spread (ft) 1.96
' Gutter Flow

Eo
d Gutter Flow Ratio
Depth of Flow (ft) 1.000
0.11
V Average Velocity (ft/sec) 3.64
' Inlet Interception
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 6.77 3.00 0.03 0.011 0.389
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.389 0.000
Combination 1.00 0.400 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.

?' C t -25
?F ?1
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0300
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.770
T Width of Spread (ft) 4.04
Gutter Flow

Eo Gutter Flow Ratio 0.917
d Depth of Flow (ft) 0.15
V Average Velocity (ft /sec) 3.24
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 7.68 3.00 0.02 0.018 0.752
Parallel Bar P-1-7/8 2.00 2.90 0.93 0.703 0.049
Combination 0.94 0.721 0.049
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
C1-Z/
50
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0300
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.110
T Width of Spread (ft) 1.36
Gutter Flow

Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.07
V Average Velocity (ft /sec) 1.00
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 3.25 3.00 0.05 0.006 0.104
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.104 0.000
Combination 1.00 0.110 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
I
S(
II
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0700
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.500
T Width of Spread (ft) 2.14
Gutter Flow

Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.11
V Average Velocity (ft /sec) 4.31
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 7.91 3.00 0.02 0.011 0.489
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.489 0.000
Combination 1.00 0.500 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
c(-q9
57-
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Grade
Date: 02/24/2005
Project No. :
' Pro ject Name.:
Com puted by
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data

' Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
' Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
II a Gutter Depression (i nch) 2.00
I , Q Discharge (cfs) 0.500
T Width of Spread (ft) 2.49
' Gutter Flow

Eo
d Gutter Flow Ratio
Depth of Flow (ft) 0.996
0.12
V Average Velocity (ft /sec) 3.77
' Inlet Intercepti on
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 7.16 3.00 0.02 0.012 0.488
t Parallel Bar
Combination P-1-7/8 2.00 2.90 1.00
1
00 0.486
0
499 0.001
0
001
. . .
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.

53
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0700
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 2.910
T Width of Spread (ft) 6.49
Gutter Flow

Eo Gutter Flow Ratio 0.725
d Depth of Flow (ft) 0.20
V Average Velocity (ft /sec) 5.74
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 19.45 3.00 0.01 0.027 2.883
Parallel Bar P-1-7/8 2.00 2.90 0.74 2.146 0.737
Combination 0.75 2.173 0.737
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
0-50
S"I+
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Sag
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data
Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
SW Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) 3.80
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d
ave Depth of Flow (ft) 0.176
_
d curb Depth at Curb (ft) 0.314
Qi Intercepted Flow (cfs) 1.550
Ci- `48
SS
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Grade
Date: 02/24/2005
Project No. :
' Project Name.:
Computed by
' Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data

' Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.500
T Width of Spread (ft) 2.49
Gutter Flow
Eo Gutter Flow Ratio 0.996
d Depth of Flow (ft) 0.12
V Average Velocity (ft/sec) 3.77
' Inlet Interception
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb Opening 7.16 3.00 0.02 0.012 0.488
' Parallel Bar P-1-7/8
Combination 2.00 2.90 1.00
1
00 0.486
0
499 0.001
0
001
. . .
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
11

' CI-2 c
s E?
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 1.430
T Width of Spread (ft) 4.96
Gutter Flow

Eo Gutter Flow Ratio 0.845
d Depth of Flow (ft) 0.17
V Average Velocity (ft /sec) 4.41
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 12.10 3.00 0.01 0.021 1.409
Parallel Bar P-1-7/8 2.00 2.90 0.86 1.216 0.193
Combination 0.87 1.237 0.193
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
57
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 1.010
T Width of Spread (ft) 4.08
Gutter Flow

Eo Gutter Flow Ratio 0.914
d Depth of Flow (ft) 0.15
V Average Velocity (ft /sec) 4.19
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 10.05 3.00 0.02 0.018 0.992
Parallel Bar P-1-7/8 2.00 2.90 0.93 0.919 0.073
Combination 0.93 0.937 0.073
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
S?
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.850
T Width of Spread (ft) 3.67
Gutter Flow

Eo Gutter Flow Ratio 0.944
d Depth o f Flow (ft) 0.14
V Average Velocity (ft /sec) 4.08
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 9.20 3.00 0.02 0.017 0.833
Parallel Bar P-1-7/8 2.00 2.90 0.95 0.794 0.039
Combination 0.95 0.811 0.039
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
5?
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.650
T Width of Spread (ft) 3.05
Gutter Flow

Eo Gutter Flow Ratio 0.978
d Depth of Flow (ft) 0.13
V Average Velocity (ft /sec) 3.93
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 8.07 3.00 0.02 0.014 0.636
Parallel Bar P-1-7/8 2.00 2.90 0.98 0.625 0.011
Combination 0.98 0.639 0.011
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
cl -_ 4
6 U
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Sag
Date: 02/24/2005
Project No.
Project Name.:
Computed by

i 1 Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

' Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00

Inlet Interception

' Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Paral lel Bar P-1-7/8
T Width of Spread (ft) 3.10
WGR Grate Width (ft) 2.00
!
' L Grate Length (ft) 3.00
I Inlet Type *Sag* Equal Len gth Combination
d
ave Depth of Flow (ft) 0.161
' d curb Depth at Curb (ft) 0.299
-
Qi Intercepted Flow (cfs) 1.360

FI
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 1.840
T Width of Spread (ft) 5.64
Gutter Flow

Eo Gutter Flow Ratio 0.790
d Depth o f Flow (ft) 0.19
V Average Velocity (ft /sec) 4.60
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 13.91 3.00 0.01 0.024 1.816
Parallel Bar P-1-7/8 2.00 2.90 0.81 1.475 0.342
Combination 0.81 1.498 0.342
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
?I-Z 1
hZ
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0500
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 2.020
T Width of Spread (ft) 5.91
Gutter Flow

Eo
d Gutter Flow Ratio
Depth of Flow (ft) 0.769
0.19
V Average Velocity (ft /sec) 4.68
' Inlet Intercep tion
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 14.66 3.00 0.01 0.025 1.995
Parallel Bar P-1-7/8 2.00 2.90 0.79 1.581 0.414
Combination 0.79 1.606 0.414
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.

I' C x-18
1,3
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Sag
Date: 02/24/2005
Project No.
' Project Name.:
Computed by
Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

' Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) 0.08
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d
ave Depth of Flow (ft) 0.098
_
d curb Depth at Curb (ft) 0.237
Qi Intercepted Flow (cfs) 0.650

'1

FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.150
T Width of Spread (ft) 1.34
Gutter Flow

Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.07
V Average Velocity (ft /sec) 1.36
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 4.56 3.00 0.04 0.006 0.144
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.144 0.000
Combination 1.00 0.150 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
CI-3g?
6s
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.240
T Width of Spread (ft) 1.60
Gutter Flow
Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.09
V Average Velocity (ft/sec) 2.18
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb Opening 5.55 3.00 0.03 0.008 0.232
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.232 0.000
Combination 1.00 0.240 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
CI-38
? t7

FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Grade
Date: 02/24/2005
Project No. :
' Project Name.:
Computed by .
' Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data

i

'
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
' Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00

' Q Discharge (cfs) 0.770
T Width of Spread (ft) 3.23
' Gutt
Fl
er
ow

Eo Gutter Flow Ratio
d Depth of Flow (ft) 0.970
0.14
V Average Velocity (ft/sec) 4.35
' Inlet Interception
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 9.20 3.00 0.02 0.015 0.755
Parallel Bar P-1-7/8 2.00 2.90 0.97 0.736 0.019
' Combination 0.98 0.751 0.019
' Note: The curb opening length in the input screen is the tota l length
of the curb opening including its length along the grat e.

I
67
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.070
T Width of Spread (ft) 1.01
Gutter Flow
Eo Gutter Flow Ratio 1.000
d Depth of Flow (ft) 0.06
V Average Velocity (ft/sec) 0.64
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb opening 3.31 3.00 0.05 0.004 0.066
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.066 0.000
Combination 1.00 0.070 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
G?
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.100
T Width of Spread (ft) 1.15
Gutter Flow
Eo Gutter Flow Ratio 1.000
d Depth o f Flow (ft) 0.06
V Average Velocity (ft/sec) 0.91
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb Opening 3.84 3.00 0.05 0.005 0.095
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.095 0.000
Combination 1.00 0.100 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
Ci-3 4
69
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0050
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.220
T Width of Spread (ft) 3.21
Gutter Flow

Eo Gutter Flow Ratio 0.971
d Depth o f Flow (ft) 0.14
V Average Velocity (ft /sec) 1.26
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 2.58 3.00 0.07 0.015 0.205
Parallel Bar P-1-7/8 2.00 2.90 0.99 0.203 0.002
Combination 0.99 0.218 0.002
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
cl r
70
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Sag
Date: 02/24/2005
Project No.
I' Project Name.:
Computed by
' Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

Cross Slope ComPosite/De
P
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) -3.48
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d
ave Depth of Flow (ft) 0.346
_
d curb Depth at Curb (ft) 0.484
Qi Intercepted Flow (cfs) 0.080
1

FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0600
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 1.180
T Width of Spread (ft) 4.23
Gutter Flow

Eo Gutter Flow Ratio 0.902
d Depth of Flow (ft) 0.16
V Average Velocity (ft /sec) 4.63
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 11.41 3.00 0.02 0.019 1.161
Parallel Bar P-1-7/8 2.00 2.90 0.91 1.062 0.100
Combination 0.92 1.080 0.100
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
Ci-39
7Z
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0200
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 2.020
T Width of Spread (ft) 7.35
Gutter Flow

Eo Gutter Flow Ratio 0.665
d Depth of Flow (ft) 0.22
V Average Velocity (ft /sec) 3.21
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 11.94 3.00 0.02 0.030 1.990
Parallel Bar P-1-7/8 2.00 2.90 0.72 1.439 0.550
Combination 0.73 1.470 0.550
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
I
Ci-?4c
?3
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0200
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.190
T Width of Spread (ft) 1.80
Gutter Flow
Eo Gutter Flow Ratio 1.000
d Depth o f Flow (ft) 0.10
V Average Velocity (ft/sec) 1.73
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb Opening 3.62 3.00 0.05 0.009 0.181
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.181 0.000
Combination 1.00 0.190 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
Ci-H I
7
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope
S Longitudinal Slope (ft/ft)
Sx Pavement Cross Slope (ft/ft)
Sw Gutter Cross Slope (ft/ft)
n Manning's Coefficient
W Gutter Width (ft)
a Gutter Depression (inch)
Q Discharge (cfs)
T Width of Spread (ft)
Composite
0.0600
0.0208
0.0550
0.016
2.00
2.00
1.110
4.08
Gutter Flow
Eo Gutter Flow Ratio
d Depth of Flow (ft)
V Average Velocity (ft/sec)
INLET
INTERCEPTION
Curb Opening
Parallel Bar P-1-7/8
Combination
Inlet Interc
LT or WGR L
(ft) (ft)
11.05 3.00
2.00 2.90
eption
E
0.02
0.92
0.93
0.914
0.15
4.59
Qi
(cfs)
0.018
1.010
1.028
Qb
(cfs)
1.092
0.082
0.082
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
G - 3 =?
-7 S

FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements

' Inlets on Sag
Date: 02/24/2005
Project No.
' Project Name.:
Computed by
' Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 6.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) 7.99
WGR Grate Width (ft) 2.00
L Grate Length (ft) 6.00
Inlet Type *Sag* Equal Length Combination
d_ave Depth of Flow (ft) 0.263
d curb Depth at Curb (ft) 0.401
Qi Intercepted Flow (cfs) 4.050

il' GC ' 1 j
-76
t FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Grade
Date: 02/24/2005
Project No.
Project Name.:
Computed by
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0200
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.050
T Width of Spread (ft) 1.09
Gutter Flow
Eo Gutter Flow Ratio
d Depth of Flow (ft)
V Average Velocity (ft/sec)
1.000
0.06
0.45
' Inlet Interception
INLET LT or WGR L E Qi Qb
' INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 2.07 3.00 0.09 0.004 0.046
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.046 0.000
' Combination 1.00 0.050 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
I
?I 1
77
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
' Inlets on Sag
Date: 02/24/2005
Project No. :
' Project Name.:
Computed by
Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

' Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) -0.21
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d_ave Depth of Flow (ft) 0.346
d curb Depth at Curb (ft) 0.484
Qi Intercepted Flow (cfs) 0.590

-7?;
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Sag
Date: 02/24/2005
Project No. :
Project Name.:
Computed by .
' Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data

' Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
SW Gutter Cross Slope (ft/ft) 0.0550
' n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00

Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) -2.79
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d
ave Depth of Flow (ft) 0.108
_
d curb Depth at Curb (ft) 0.247
Qi Intercepted Flow (cfs) 0.160
1
(fl, C7
Ii' -79
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0150
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.250
T Width of Spread (ft) 2.30
Gutter Flow

Eo Gutter Flow Ratio 0.999
d Depth o f Flow (ft) 0.12
V Average Velocity (ft /sec) 2.03
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 3.73 3.00 0.05 0.012 0.238
Parallel Bar P-1-7/8 2.00 2.90 1.00 0.238 0.000
Combination 1.00 0.250 0.000
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
G?- ?+3
160
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0150
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.370
T Width of Spread (ft) 3.14
Gutter Flow

Eo Gutter Flow Ratio 0.974
d Depth of Flow (ft) 0.13
V Average Velocity (ft /sec) 2.16
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 4.45 3.00 0.04 0.015 0.355
Parallel Bar P-1-7/8 2.00 2.90 0.98 0.350 0.005
Combination 0.99 0.365 0.005
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
044
?(
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
t Inlets on Grade
Date: 02/24/2005
Project No. :
Pro ject Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data

' Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0200
Sx Pavement Cross Slope (ft/ft) 0.0208
' Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (i nch) 2.00
Q Discharge (cfs) 2.440
T Width of Spread (ft) 7.98
' Gutter Flow

' Eo
d Gutter Flow Ratio
Depth of Flow (ft) 0.625
0.23
V Average Velocity (ft /sec) 3.34
' Inlet Intercepti on
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)

Curb Opening 13.30 3.00 0.01 0.033 2.407
Parallel Bar P-1-7/8 2.00 2.90 0.69 1.651 0.756

I Combination 0.69 1.684 0.756
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.

45 Z
' FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
t Inlets on Sag
Date: 02/24/2005
Project No.
Project Name.:
Computed by
Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data
Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 6.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) 7.36
WGR Grate Width (ft) 2.00
L Grate Length (ft) 6.00
Inlet Type *Sag* Equal Length Combination
d
ave Depth of Flow (ft) 0.250
_
d curb Depth at Curb (ft) 0.388
Qi Intercepted Flow (cfs) 3.750

0-3
3
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Grade
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Grade: Curb Opening, Grate Inlet
Roadway and Discharge Data
Cross Slope Composite
S Longitudinal Slope (ft/ft) 0.0150
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Q Discharge (cfs) 0.500
T Width of Spread (ft) 3.83
Gutter Flow
Eo Gutter Flow Ratio 0.932
d Depth of Flow (ft) 0.15
V Average Velocity (ft/sec) 2.26
Inlet Intercep tion
INLET LT or WGR L E Qi Qb
INTERCEPTION (ft) (ft) (cfs) (cfs)
Curb Opening 5.16 3.00 0.03 0.017 0.483
Parallel Bar P-1-7/8 2.00 2.90 0.95 0.461 0.022
Combination 0.96 0.478 0.022
Note: The curb opening length in the input screen is the total length
of the curb opening including its length along the grate.
0- L15
-P?q
FHWA Urban Drainage Design Program, HY-22
Drainage of Highway Pavements
Inlets on Sag
Date: 02/24/2005
Project No. .
Project Name.:
Computed by .
Inlets on Sag: Equal-Length Combination Inlet
Roadway and Discharge Data
Cross Slope Composite/Dep
Sx Pavement Cross Slope (ft/ft) 0.0208
Sw Gutter Cross Slope (ft/ft) 0.0550
n Manning's Coefficient 0.016
W Gutter Width (ft) 2.00
a Gutter Depression (inch) 2.00
Inlet Interception
Inlet Type *Sag* Curb-Opening
L Curb-Opening Length (ft) 3.00
H Curb-Opening Height (in) 6.00
Inlet Type *Sag* Parallel Bar P-1-7/8
T Width of Spread (ft) 0.18
WGR Grate Width (ft) 2.00
L Grate Length (ft) 3.00
Inlet Type *Sag* Equal Length Combination
d_ave Depth of Flow (ft) 0.100
d curb Depth at Curb (ft) 0.239
Qi Intercepted Flow (cfs) 0.670
O-Z
$-S

u

yl
Hydraulic Grade Line Calculations
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116
Channel "A" Calculations
117
I, CHANNEL "A"
Worksheet for Triangular Channel
Project Description
' Project File c:\haestad\academic\fmw\project1.fm2
Worksheet CHANNEL "A"
Flow Element Triangular Channel
I' Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.030 -- GeASS ekA, ,u?
' Channel Slope 0.025000 fttft
Left Side Slope 2.000000 H : V
Right Side Slope 2.000000 H : V
Discharge 6.90 cfs GA ` /©ey? -7.2z\ 2.,j
Results
' Depth 0.90 ft
Flow Area 1.62 ft2
Wetted Perimeter 4.02 ft
Top Width 3.60 ft
Critical Depth 0.94 ft
Critical Slope 0.019563 fttft
Velocity 4.27 ft/s
Velocity Head 0.28 ft
Specific Energy 1.18 ft
Froude Number 1.12
Flow is supercritical.
03/01/05 Academic Edition
12:40:16 PM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]
FlowMaster v5.17
Page 1 of 1
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MAGNETIC
7-7
SPAULDING & SEA`, D REVISION DATE
WEST LAKE S4& NORRIS, PA
c? m aR:
"b"tO°"t0t Deslpn Consultants
CATCHSASV DRANNACEAREA DELAFAnMMAP S 1 Ralel h97 orth Corollnod
27007
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MAGNETIC
"PIEMW AV: SPA ULDING & SE"`: D R VISION DATE
q wrt :
01 1 Q WEST LAKE POW MI'M S N ORRIS, ORRIS, Consultants PA
Q PRE-Ma OPED SEDIMENT RA MV T
^? ? Awpa 872 Trinity Road
h, North oro ( 2919) ) 8 5
DRAINAGE AREA DELII EATM MAP Phone ( (919) 919) 854- 7990 Fax x (
834-7925
MMEEM
SPAULDING & NORRIS, PA
Planning • Civil Engineering ? Environmental
STORMWATER MANAGEMENT
CALCULATIONS
FOR
WEST LAKE SUBDIVISION
PHASE I - SINGLE FAMILY
CARY, NORTH CAROLINA
'V `11,.., m i0rj?,'t
51S f???:Y?iJ)j pIry•
;?`??j,;?e ?? ,?1Q '`?i• ??°'' ??H CAR `?''?,
,:?;+: V -.oeawamn°e s?? ?'?? A O ?NO•••e0/ ?`
e SEAL
C-9875 $ 8
uaOOac°caw,ua °O°a .i? •?e•e' _ `O ??
Prepared for:
D.R. Horton, Inc.
2000 Aerial Center Parkway
Suite 110
Morrisville NC 27560
Submitted By:
Spaulding & Norris, PA
972 Trinity Road
Raleigh, North Carolina 27607
Office [phone]
Fax [phone]
DATE: 10-2405
PROJECT: 556-05
Phone: [phone] • Fax: [phone] Trinity Road • Raleigh, North Carolina 27607

I'
Table of Contents
1
Section Page
'
Introduction, Methodology, and Conclusion 1-2
Pond 1 Design Calculations 2-6
Pond 2 Design Calculations 7-12
Pond 3 Design Calculations 13-18
Pond 4 Design Calculations 19-22

DWQ Worksheets 23-31
i'
Attachments:

Drawing Sheet C-5 - Grading and Drainage Plan
I' Drawing Sheet C-6 - Erosion Control Plan
Drawing Sheet C-19 - Construction Detail Sheet
Drawing Sheet C-20 - Construction Detail Sheet
Drawing Sheet C-21- Drainage and Erosion Control Schedules
I,

I'

' I. Introduction
The proposed West Lake subdivision is located at the intersection of West Lake Road and
Optimist Farm Road in Cary, North Carolina. The subdivision proposes to create 75
single family lots on a 43.1 acre tract. The development is subject to the Neuse River
I' Basin Nitrogen Reduction Rules, as well as any additional requirements from the
NCDENR Division of Water Quality.
The Neuse River Basin Nitrogen Reduction Rules state that in addition to nitrogen
reduction requirements, the post-developed one-year storm peak flow must be detained
and released at a rate equal to or less than the pre-developed one year storm peak flow.
Through the use of on-site detention ponds, the 1-year storm will be detained and released
at a rate less than the pre-developed levels.
Additional requirements from the NCDENR Division of Water Quality were imposed on
this phase of the project. Since the project is located in a nutrient sensitive watershed,
BMP's are required to remove 85% TSS. The BMP's chosen consist of extended dry
detention basins which outlet into grassed swales. Extended dry detention basins achieve
501/o TSS removal, and grass swales achieve 35% TSS removal.
II. Methodology
The rational method was used to calculate the peak stormwater rates as follows:
Rational Method Q = cia
Q = Peak stormwater runoff rate (cfs)
c = Runoff coefficient
i = Rainfall intensity, based on storm event selected (in./hr.)
A = Drainage area (ac.)
All stormwater from the proposed storm drainage collection systems will discharge into
detention ponds. There are a total of four ponds proposed for the project.
Pond calculations were completed using "Hydraflow Hydrographs 2000" software by
Intellisolve. Hydrographs were created for the pre-developed and post-developed
conditions, for the 1-year, 10-year and the 100-year storms. Pond data consisting of
contour surface areas and outlet structure specifications was input, and the post-developed
hydrographs routed through the ponds.
The ponds are designed to detain the 1-year storm and to release the storm water at a rate
less than the pre-developed levels. The ponds are also designed to capture the runoff from
the 1" storm and release it over a period of 2-5 days. The ponds are designed to safely
pass the 100-year storm event through an emergency spillway without overtopping the
pond, while maintaining a minimum of 12" freeboard.

1 0

'1
II!,
III'
Pond 1 Design Calculations
0
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T>aAtm(Ae ? A&EA : 3.$5 A,

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1,z.5 Ct,aVn,
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??{??vrlf./? .5wA4 Gin/Cnjr°? = (l0(1 '??? ??4e0 t? A = 2 i
70
?J`
Reservoir Report Page ,
Reservoir No. 1 - Pond #1 Hydraflow Hydrographs by Intelisolve
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
Stage (R) Elevation (R) Contour area (sqR) incr. Storage (cuft) Total storage (cult)
0.00 403.00 1,871 0 0
1.00 404.00 2,437 2,154 2,154
2.00 405.00 3,062 2,750 4,904
2.25 405.25 3,228 786 5,690
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [Dl
Rise In = 12.0 1.3 0.0 0.0 Crest Len R = 8.00 0.00 0.00 0.00
Span in = 12.0 1.3 0.0 0.0 Crest El. ft = 405.25 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 0.00 0.00 0.00
Invert El. R = 403.00 403.00 0.00 0.00 Weir Type = Rect - - -
Lengm ft = 20,0 0.0 0.0 0.0 Multi-Stage = Yes No No No
slope % = 0.50 0.00 0.00 0.00
N -Value = .013 .013 .000 .000
Orif. Coelf. = 0.80 0.60 0.00 0.00
Multi-Stage = n/a Yes No No EARratlon Rate - 0.00 Whr/sgft Tallwater Elev. = 0.00 ft
Wale: All outflows have been analyzed under Inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Clv C Civ D Wr A Wr B Wr C Wr D Extil Total
R cult R cis cis cis cis cis cis cis cis cis cis
0.00 0 403.00 0.00 0.00 - - 0.00 - - - - 0.00
1.00 2,154 404.00 0.04 0.04 - - 0.00 - - - - 0.04
2.00 4,904 405.00 0.06 0.08 - - 0.00 - - - - 0.06
2.25 5,690 405.25 0.06 0.06 - - 0.00 - - - - 0.06
CD
Hydrograph Plot
/ - yE,q A Hy&aftw Hyft raphs by Intebdw
Hyd. No. 2
Pond #1
Hydrograph type = Reservoir
Storm frequency = 1 yrs
Inflow hyd. No. = 1
Max. Elevation = 403.96 ft
Peak discharge = 0.04 cfs
Time interval = min
Reservoir name = Pond #1
Max. Storage = 2,074 tuft
aw"C hwimft .." used.
F firdrh Vdwne = 1,9Z cult
2 - Reservoir -1 Yr - Qp = 0.04 cfs
V
CY
V
6
4
2

0

0.0 2.4 4.8 7.2 9.6 12.0 14 .4 16 .8 19 .2 21.6 24
Time (hrs)
/ Hyd. 1 / Hyd.2
.0

Pond 1 Swale
Worksheet for Triangular Channel

Project Description
' Project File f:\551 - 600 projects1556-05 west lake properly (drh)\stormwaterlgrass sw.fm2
Worksheet Pond 1 Swale
Flow Element Triangular Channel
Method Manning's Formula
Solve For Channel Depth
Input Data
Mannings Coefficient 0.040
Channel Slope 0.005000 ftift
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V f?
Discharge 0.05 cfs "?- r?1 A y
Results
Depth 0.18 ft
Flow Area 0.10 ft2
Wetted Perimeter 1.14 ft
Top Width 1.08 ft
Critical Depth 0.11 ft
Critical Slope 0.065448 ft/ft
Velocity 0.51 ft/s
Velocity Head 0.41 e-2 ft
Specific Energy 0.18 ft
Froude Number 0.30
Flow is subcritical.
it
("I
Li-
10/21/05 Academic Edition
10:03:36 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]

FlowMaster v5.17
Page 1 of 1

Pond 2 Design Calculations

I 0WO
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Sheet No. of
Job No.
Cl 11 SPAULDING & NORRIS PA Date
' Civil Engineering 6t Planning
Subject

1 Designed by Date
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Reservoir Report P
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Reservoir No. 1 - Pond #2 Hydraflow Horographs by lntelisolve
Pond Data
Pond storage is based on known contour areas. Average end area method used.
Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 364.00 4,729 0 0
1.00 365.00 5,794 5,262 5,262
2.00 366.00 6,927 6,361 11,622
3.00 367.00 8,128 7,528 19,150
3.50 367.50 8,753 4,220 23,370
4.00 368.00 9,395 4,537 27,907
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise in = 12.0 2.2 0.0 0.0 Crest Len ft = 8.00 0.00 0.00 0.00
Span in = 12.0 2.2 0.0 0.0 Crest El. ft = 367.50 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coetr. = 3.33 0.00 0.00 0.00
Invert El. ft = 364.00 364.00 0.00 0.00 Weir Type = Rect - - -
Length it = 50.0 0.0 0.0 0.0 Multistage = Yes No No No
slope % = 0.50 0.00 0.00 0.00
N -Value = .013 .013 .000 .000
Orlf. Coelf. = 0.60 0.60 0.00 0.00
Mugistage = Na Yes No No Exllltratlon Rate s 0.00 iMvlsgft TaiMlater Elev. = 0.00 ft
Note: All outlbws hwm been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Civ A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Exfil Total
It cult It cfs cis cis cis cis cis cfs cis cis cis
0.00 0 364.00 0.00 0.00 - - 0.00 - - - - 0.00
1.00 5,262 365.00 0.13 0.12 - - 0.00 - - - - 0.12
2.00 11,622 366.00 0.17 0.17 - - 0.00 - - - - 0.17
3.00 19,150 367.00 0.23 0.21 - - 0.00 - - - - 0.21
3.50 23,370 367.50 0.23 0.23 - - 0.00 - - - - 0.23
4.00 27,907 368.00 6.38 0.05 - - 6.33 - - - - 6.38
/d
Hydrograph Plot

Hyd. No. 2
Oe
e ?r?.?c, Hy&aftw Hy&oWWo by InWhW e
Pond #2
Hydrograph type = Reservoir Peak discharge = 0.12 cls
Storm frequency = 1 yrs Time interval = 1 min
Inflow hyd. No. = 1 Reservoir name = Pond #2
Max. Elevation = 365.05 ft Max. Storage = 5,555 cuft
Skw#V Indication msd used Hy mwwh Vdune = 5,197 ouR
2 - Reservoir -1 Yr - Qp = 0.12 ds
20
15
1
CY
0.0 2.4 4.8 7.2 9.6 12.0 14.4 16.8 19.2 21.6 24.0
Time (hrs)
/ Hyd. 1 / Hyd. 2

0
5
0

i?
'
Pond 2 Swale
Worksheet for Triangular Channel

Project Description
Project File
f:\551 - 600 projectA556-05 west lake properly (drh)\stormwater\grass sw.fm2
Worksheet Pond 1 Swale
Flow Element Triangular Channel
' Method Manning's Formula
Solve For Channel Death
I
Input Data
Mannings Coefficient 0.040
Channel Slope 0.020000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Discharge 0.15 cfs
Results
Depth 0.21 ft
Flow Area 0.13 ftz
Wetted Perimeter 1.33 ft
Top Width 1.26 ft
Critical Depth 0.17 ft
Critical Slope 0.056544 ft(ft
Velocity 1.13 ft(S
Velocity Head 0.02 ft
Specific Energy 0.23 ft
Froude Number 0.61
Flow is subcritical.

' 10!21/)5 Academic Edition
11:52:03 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]
1 0
FlowMaster v5.17
Page 1 of 1

n

Pond 3 Design Calculations
i 0 /3
PNr) ?3
17r ok-,AC?E ALFA - x,83 AL
V"Lurnc, 4,=a" .E7i
,r65- i c,
F•r< 2z.
Rv = 6,os + 0,009 (I) = 0,05 { (o,C?,a )l50 = 0.50
T ((11?+ ?/`Z`?;D,????,533AL?\?35(p?SQ'FTl^L.
/ M2l i \LI 5 t?3
ZO •re Ste' ?v4 F n?T ST"s n.r1G?E
?4 71
p?z?f?cr s??c
c,- rA,
TCd,zo2?}B C?2?(o?b?(2o2'??? c?w.w.?•?fr ---_"_--
pE 6pviVAL aAJ Paves; VC17 ??
/11,4 Y o e%
/ ?7
Reservoir Report
Page 1

'
I Reservoir No. 1 - Pond #3 Hydraflow Hydrographs by lntelW*e
I Pond Data
Pond storage is based on known contour areas. Average end area method used.

Stage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
0.00 366.00 2,699 0 0
1.00 367.00 3,447 3,073 3,073
2.00 368.00 4,277 3,862 6,935
3.00 369.00 5,171 4,724 11,659
1 4.00 370.00 6,129 5,6550 17,309
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] [D]
Rise in = 12.0 2.0 0.0 0.0 Crest Len It = 8.00 0.00 0.00 0.00
Span In = 12.0 2.0 0.0 0.0 Crest El. It = 370.00 0.00 0.00 0.00
' No. Barrels = 1 1 0 0 Weir Coeff. = 3.33 0.00 0.00 0.00
Invert El. It = 366.00 366.00 0.00 0.00 Weir Type = Rect
Length It = 36to 0.0 0.0 0.0 Multi-Stage = Yes No No No
Slope % = 0.50 0.00 0.00 0.00
' N -Value = .013 .013 .000 .000
Orif. Coeff. = 0.60 0.60 0.00 0.00
Multi-stage = Na Yes No No Exfiltration Rate = 0.00 In/hr/sgft Tallwater Elev. = 0.00 ft

' e: AN oublows have been analyzed under inlet and outlet control.
Nat
Stage /Storage /Discharge Table
Stage Storage Elevation Clv A Clv B Civ C Clv D Wr A Wr B Wr C Wr D Exfil Total
' It cult It cis cis cis cis cis cis cis cis cis cis
0.00 0 366.00 0.00 0.00 - - 0.00 - - - - 0.00
1.00 3,073 367.00 0.11 0.10 - - 0.00 - - - - 0.10
2.00 6,935 368.00 0.15 0.14 - - 0.00 - - - - 0.14
' 3.00 11,659 369.00 0.18 0.18 - - 0.00 0.18
4.00 17,309 370.00 0.20 0.20 0.00 - - - - 0.20

I 1

I
II
I
? S
Hydrograph Plot
-?
Hyd. No. 2 Ala 77N,?
Pond #3
Hydrograph type = Reservoir Peak discharge = 0.11 cfs
Storm frequency = 1 yrs Time interval = 1 min
Inflow hyd. No. = 1 Reservoir name = Pond #3
Max. Elevation = 367.29 ft Max. Storage = 4,206 cuff
? ?.H, ,wdwd wea. HydmgWh Vdume = 4,150 curt
15
11
1202
v
CY
t
Time (hrs)
/ Hyd. 1 / Hyd.2
.0
2 - Reservoir -1 Yr - Qp = 0.11 ds

i
I
D.0 2.4 4.8 7.2 9.6 12.0 14 .4 16 .8 19 .2 21.6 24
?D
'
Pond 3 Swale
Worksheet for Triangular Channel
'
' Project Description
Project File
f:1551 - 600 projects\556-05 west lake property (drh)istormwateAgrass sw.fm2
Worksheet Pond 1 Swale
Flow Element Triangular Channel
' Method Manning's Formula
Solve For Channel Depth
E

Input Data
Mannings Coefficient 0.040
Channel Slope 0.005000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Discharge 0.14 cfs
Results
Depth 0.27 ft
Flow Area 0.21 flz
Wetted Perimeter 1.68 ft
Top Width 1.59 ft
Critical Depth 0.17 ft
Critical Slope 0.057075 ft/ft
Velocity 0.66 ft/s
Velocity Head 0.01 ft
Specific Energy 0.27 ft
Froude Number 0.32
Flow is subs ritical.
o.Z

10/21/05 Academic Edition
10:06:03 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]
C/7)
FlowMaster v5.17
Page 1 of 1
Pond 4 Design Calculations
, w C/?
Poan *k 4
P rk v A(F A i1.rA ; 2, 5 g A L Fry - k17

??: D,Drj t Q.OD?( CT> = O.bS (b U09?(SD) O.?
V e? _ (,DES if?N ? Fa?'TN K\J 1? A
CI ?( ??2 ° l? ?5 J\ 2,58 Ac.)C ?135?a SQL-/??> _ ?/G82? ?+?
ZO'?o S?r/tEti-r SrO2r??E
TO(- ?pL ? ??Z
Ovvr-cz7 5,-i.L
A, 305)77 ( 0, ooh ?}Z = 1.22 :?) 1.25 o?ww?
T Ca 2o-iz8 (-4z)(o,6)( Zo`fzFs? Drawl
SvP,t?. D?SiG?/J
17???!'?'J?N? EcYer?4.?iL?`.ai i4?E.A ?E:t:.? d,?J f??'?C'] ? ? 1?`'1.? t..?
?q
Reservoir Report
Page 1
Reservoir No. 1 - Pond #4 Hydraflow Hydrographs by intelisolve
Pond Data
Pond storage is based on known contour areas. Average end area method used.
S
tage / Storage Table
Stage (ft) Elevation (ft) Contour area (sgft) Incr. Storage (cult) Total storage (cult)
' 0.00 355.00 2,241 0 0
1.00 356.00 2,892 2,567 2,567
2.00 357.00 3,605 3,249 5,815
Culvert / Orifice Structures Weir Structures
[A] [B] [C] [D] [A] [B] [C] ID]
Rise in = 12.0 1.3 0.0 0.0 Crest Len ft = 8.00 0.00 0.00 0.00
Span M = 12.0 1.3 0.0 0.0 Crest El. It = 357.00 0.00 0.00 0.00
No. Barrels = 1 1 0 0 Weir Coelt. = 3.33 0.00 0.00 0.00
Invert El. ft = 355.00 355.00 0.00 0.00 Weir Type = Rect - - -
Length ft = 31,0 0.0 0.0 0.0 Muld-Stage = Yes No No No
slope % = 0.50 0.00 0.00 0.00
N -Value = .013 .013 .000 .000
Orif. Coeur. = 0.60 0.60 0.00 0.00
' Multi-Stage = Na Yes No No ExIlltration Rate = 0.00 hftlsgft TalA?rater Elev. = 0.00 It
Note: All outlbws how been analyzed under inlet and outlet control.
Stage / Storage / Discharge Table
Stage Storage Elevation Clv A Clv B Civ C Chu D Wr A Wr B Wr C Wr D Extil Total
It cult R cfs cfs cfs cfs cfs cfs cfs cfs cfs cfs
0.00 0 355.00 0.00 0.00 - 0.00 0.00
1.00 2,567 356.00 0.04 0.04 - 0.00 - - - - 0.04
2.00 5,815 357.00 0.06 0.06 - - 0.00 - - - - 0.06 I

Hydrograph Plot
/! \7r--A-4 Hy&Wlow Hy&Wmphs by IrdeftoW
Hyd. No. 2
Pond #4
Hydrograph type = Reservoir Peak discharge = 0.03 cfs
Storm frequency = 1 yrs Time interval = 1 min
Inflow hyd. No. = 1 Reservoir name = Pond #4
Max. Elevation = 355.54 ft Max. Storage = 1,389 cuft
HY&WWh VdUffle =1,290 cuR
2 - Reservoir -1 Yr - Qp = 0.03 cfs
5
v
CY
.0
Time (hm)
Hyd. 1 / Hyd. 2
/

i
i
1.0 2.4 4.8 7.2 9.6 12.0 14 .4 76 .8 19 .2 21. 24
v

Pond 4 Swale
Worksheet for Triangular Channel

' Project Description
Project File
fA551 - 600 projects\556-05 west lake property (drh)lstormwaterlgrass sw.fm2
Worksheet Pond 1 Swale
Flow Element Triangular Channel
' Method Manning's Formula
Solve For Channel Death
I
Input Data
Mannings Coefficient 0.040
Channel Slope 0.005000 ft/ft
Left Side Slope 3.000000 H : V
Right Side Slope 3.000000 H : V
Discharge 0.04 cfs ?--_
Results
' Depth 0.17 ft
Flow Area 0.08 ft2
Wetted Perimeter 1.05 ft
t Top Width 1.00 ft
Critical Depth 0.10 ft
Critical Slope 0.067423 ft/ft
' Velocity 0.48 ft/s
Velocity Head 0.36e-2 ft
Specific Energy 0.17 ft
Froude Number 0.30
Flow is subcritical.
/4,1Y 010 7cpel/ti ra/Jrl

10121105 Academic Edition
10:15:31 AM Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 [phone]
FbwMaster v5.17
Page 1 of 1
DWQ Worksheets
2 3?'
t'

r

Project No. DWQ
DIVISION OF WATER QUALITY
401 EXTENDED DRY DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
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
PROJECT INFORMATION (please complete the following information):
Project Name :
Contact Person:
S?BO?y?S?a?J - ?N,?? l
Phone Number. HI!5 ) ?Fs-y -.19 16
For projects with multiple basins, specify which basin this worksheet applies lo:. Po N a
Drainage Area: 3acres Percent Impervious Area:.2 6 %
H. REQUIRED ITEMS CHECKLIST
The following cheddist outlines design requirements per the Sb7nwater Best Management Practices Manual (N.C. Department of
' Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space
provided to Indicate the following design requirements have been met and supporting documentation Is attached. If.s re%frement has not
been met; attach an mplanabon of why.
Aooticants Initials
Either capture runoff from 1 yr., 24 hour storm and release over a 48 hair period, or
MLe,•
c runoff from 1 inch storm and draw
apture down over a period of 2 to 5 days.
Please provide routing for 1 yr. 24 hr. event or volume from 1 Inch rain l-Y?' SToPrt leevn-l.VR.,?',r ?r
'-0 , 5 The basin length to width rata is greater than 3:1.
?" The basin side slopes are no steeper than 3:1.
^?L 5 A small permanent pool at outlet orifice Is provided to reduce dogging.
?c S An emergency drain to completely empty the basin is provided.
,'"V-5L-Vegetation plan prepared Is specified on plans.
II' ,4" Basin to be stabilized within 14 days of consb'ixclion is specified.
llwtli Sediment storage (20% of detention volume) in addition t0 detention volume Is provided.
1*4es Inlet and outlet erosion control measures to prevent scour are provided.
i?a< S Additional treatment to meet the 85% TSS removal efficiency Is provided.
i' tea.+tg Access for clean-out and maintenance Is provided.
Inlet plunge pod or other energy dissipation is provided.
•4'145 Forebay is provided to capture sediment and minimize dean-out problems.
t /< s Unoompacted natural soils are utilized b promote vegetation and reduce sedimentation.
oft 5 Seasonal high water table is at least 1 foot below bottom of basin.
eW5, If used as a temporary sediment basin, plans Indicate dean-out prior to final operation.
44' A site specific operation and maintenance plan with the following provisions is provided.
* Gi The 0&M agreement is signed by the responsible party and notarized.

'
DWQ Project No.
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1. PROJECT INFORMATION (please complete the following information):
I
Project Name : W ? ?"r' [,?4KF s v 9Q? y?SJO' N A to to
Contact Person: ?'?? sc <w? ?.o s ?- Phone Number: (9'/1) 7 9
Swale ID: 0_AQ
'7 O
Grass Swale Length it (at least 100 tt per tributary acre)
Tributary Drainage Area o , o Z ac. (on-sib and off-site drainage to the Swale)
Impervious Area c: H U ac. (on-sib and off-site drainage tD the swale)
Max. Velocity from 2 Yr. Storm o. `t 9 fps (2 fps max.)
Max. Velocity from 10 Yr. Storm 0.6-1 fps
' Min. side slopes 3 : I rata (3:1 min.)
Steepest Effective Slope 0.00 5 ftm (check dams may be used)
Cover crop G. EA-6 t
q. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. ff a
requitement 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
Awlicants Initials
ML5
Aid- f
"»t l
?y! L
' u ?JLS
l'hL-S
hIG S

1
-Vegetation Plan provided on plans
-The underlying soils are permeable arid non-compacied
-Swale carries only dormwabr flow
-Water table depth is greater than 1 foot
-Plan details for the swale provided
-Plan details for the inlets and outlets are provided.
-Check dams provided.
_The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
-The operation and maintenance agreement signed and notarized by the responsible party is provided.

Project No. DWQ
DIVISION OF WATER QUALITY
401 EXTENDED DRY DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
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
PROJECT INFORMATION (please complete the following information):
Project Name :
Contact Person
/rli ... xN i r1 G? Phone Number j71,9
For projects with multiple basins, specify which basin this worksheet apples to:_ ?,?? 2.
Drainage Area: /o. acres Percent Impervious Area: 25 %
U. REQUIRED ITEMS CHECKLIST
?9 ,10
The following checklist outlines design requirements per the Stoimwataer Best Management Practices Manual (N.C. Department of
Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space
provided to indicate the following design requirements have been met and supporting documentation is attached. If.s ?equim meta has not
been met; attach an e*Wadon of why.
Applicants Initials
Either capture runoff from 1 yr., 24 hour storm and release over a 48 hour period, or
M - S capture runoff from 1 inch storm and draw down over a period of 2 to 5 days.
Please provide routing for 1 yr. 24 hr. event or volume from 1 inch rain
m zf The basin length to width ratio is greater than 3:1.
1;f The basin side slopes are no steeper than 3:1.
?°Lf A small permanent pod at outlet ortfice is provided to reduce dogging.
? S' An emergency drain to completely empty the basin is provided.
194-4 Vegetation plan prepared is specified on plans.
!a/- Basin to be stabilized within 14 days of construction is specified.
1W1-5 '-- .Sediment storage (20% of detention volume) in addition to detention volume Is provided.
yWZ t Inlet and outlet erosion control measures to prevent scour are provided.
4!i" Additional teatment to meet the 85% TSS removal efficiency is provided.
W Access for clean-out and maintenance is provided.
-Vkr Inlet plunge pod or other energy dissipation is provided.
,0,0,r Forebay is provided b capture sediment and minimize clean-out problems.
.014' Uncompacted natural soils are utilized lo prorate vegetation and reduce sedimentation.
, Seasonal high water table is at least 1 foot below bottom of basin.
Alf If used as a temporary sediment basin, plans indicate clean-out prior to final operation.
A site specific operation and maintenance plan with the following provisions is provided.
The 0&M agreement is signed by the responsible pasty and notarized.
1
DWQ Project No.
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1 I. PROJECT INFORMATION
Project Name :
Contact Person:
Swale ID: Pv ?d Z
'
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Stain
Max. Velocity from 10 Yr. Sbrm
Min. side slopes

Steepest Effective Slope
Cover Crop
q. REQUIRED ITEMS CHECKLIST
complete the following information):
z4A?;r sv???r.rSiya. A/Asi /
Phone Number. ( 9'/9) ?fsV -! 9 9 a
q 5 it
o. n 5 ac.
Z, 5k ac.
?? 11 fps
/. ! 3 fps
rata
©. d Z tt/lt
(at least 100 It. per tributary acre)
(on-sib and off-site drainage to the swale)
(on4b and off-site drainage to the swats)
(2 fps max.)
(3:1 min.)
(check dams may be used)
Initial in the space provided to Indicate the blowing design requirements have been met and supporting documentation Is attached. ff a
requirement has not been me( attach an e*bwfion 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
Al -c- The underlying soils are permeable
and non-compacted
foot
Plan details for the swale provided.
Plan details for the inlets and outlets are provided.
A? Check dams provided.
The operation and mainbnance agreement Includes annual erosion and vegetation repair, and at least twice
annual mowing.
The operation and maintenance agreement signed and notarized by the responsible party Is provided.
G Vegetation Plan provided on plans
?L Swale carries only atarmwabr flow
Water We depth is greater than 1
1
'1
'1

II
!I
Project No. DWQ
DMSION OF WATER QUALITY
401 EXTENDED DRY DETENTION BASIN WORKSHEET
DWQ Storrnwater Management Plan Review:
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
PROJECT INFORMATION (please complete the following information):
Project Name :
Contact Person:
('il? / z4 y'

I"9lf4C- Scrlive" ic9 E - Phone Number:
For projects with multiple basins, specify which basin this worksheet applies to: ?a n? 3
Drainage Area?=Vacres Percent Impervious Area: 45 %
II. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of
' Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space
provided to indicate the following design requirements have been met and supporting documentation is attached. If a regtdement has not
been met, attach an explanation of why.
Aoalicants Initials
r

Either capture runoff from 1 yr., 24 hour storm and release over a 48 hour period, or
LS capture runoff from 1 inch storm and draw down over a period of 2 to 5 days.
Please provide routing for 1 yr. 24 hr. event or volume from 1 inch rain
The basin length to width ratio is greater than 3:1.
ML -5 *The basin side slopes are no steeper than 3:1.
!1l A small permanent pool at outlet orifice is provided to reduce clogging.
n1/,f An emergency drain to completely empty the basin is provided.
/+1?:fi Vegetation plan prepared is specified on plans.
Basin to be stabilized within 14 days of construction is specified.
Af Sediment storage (20% of detention volume) in addition to detention volume is provided.
**I S Inlet and outlet erosion control measures to prevent scour are provided.
Additional treatment to meet the 85% TSS removal efficiency is provided.
Access for dean-out and maintenance is provided.
/#j <' Inlet plunge pool or other energy dissipation is provided.
?19L <Forebay is provided to capture sediment and minimize clean-out problems.
Idi C Uncompacted natural soils are utilized to promote vegetation and reduce sedimentation.
An e Seasonal high water table is at least 1 foot below bottom of basin.
glIK If used as a temporary sediment basin, plans indicate dean-out prior to final operation.
A site specific operation and maintenance plan with the following provisions is provided.
-AW The 0&M agreement is signed by the responsible party and notarized.
I

DWQ Project
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
1. PROJECT INFORMATION (please complete the following information): l 11
Project Name : /-1/45557- G,QIC S ? / Pf4et..?
Contact Person: Phone Number: (94-2 '7 `f 9c>
Swale ID: ?
Grass Swale Length
Tributary Drainage Area
Impervious Area
Max. Velocity from 2 Yr. Storm
Max. Velocity from 10 Yr. Storm
Min. side slopes
Steepest Effective Slope
Cover Crop
?e ft
o,G S ac.

p. 6 S? fps
?- U fps
• rata
Ila
(at least 100 ff. per tributary acre)
(on4le and oti site drainage to the Swale)
(on-site and off-site drainage to the Swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
u. REQUIRED ITEMS CHECKLIST
Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. ff a
requirement has not been met attach an e0lanadon 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 inoomplete submittal package will result in a request for
additional information and will substantially delay final review and approval of the project
Apaficants Initials
/74a Vegetation Plan provided on plans
Lf The underlying soils are permeable and non-compacted
/!1G Swale carries only stormwater flow
Water table depth is greater than 1 foot
Plan details for the swale provided
Plan details for the inlets and outlets are provided.
Q Check dams provided.
The operation and maintenance agreement kxiludes annual erosion and vegetation repair, and at least dxice
annual mowing.
AMC The operation and maintenance agreement sigrW and notarized by the responsible party is provided.
' Project No. DWQ
DIVISION OF WATER QUALITY
401 EXTENDED DRY DETENTION BASIN WORKSHEET
DWQ Stormwater Management Plan Review:
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
PROJECT INFORMATION (please complete the following information):
Project Name :
Contact Person:
A't.r'o
Phone Number.
For projects with multiple basins, specify which basin This worksheet applies b:.QU n el #-u
Drainage Area 7. V acres Percent Impervious Area:.1 5 %
p. REQUIRED ITEMS CHECKLIST
dam/--7990
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of
Environment, Health and Natural Resources, November 1995) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space
provided Io indicate the following design requirements have been met and supporting documentation is attached. If a requirement has not
been me( attach an e;#watfon of why.
Applicants Initials
Either capture runoff from 1 yr., 24 hour storm and release over a 48 hour period, or
IY14-5' capture runoff from 1 inch storm and draw down over a period of 2 to 5 days.
Please provide routing for 1 yr. 24 hr. event or volume from 1 inch rain
1)14$- The basin length to width ratio is greater than 3:1.
Ml-f' The basin side slopes are no steeper than 3:1.
eZW A small permanent pod at outlet orifice Is provided to reduce dogging.
MI An emergency drain to completely empty the basin Is provided.
'774f Vegetation plan prepared is specified on plans.
M r Basin to be stabilized within 14 days of construction Is specified.
Nil- Sediment storage (20% of detention volume) in addition to detention volume Is provided.
lNC Inlet and outlet erosion control measures to prevent scour are provided.
/4Z-f Additional treatment to meet the 85% TSS removal efficiency is provided.
coess for clean-out and maintenance is provided.
BAs Inlet plunge pod or other energy dissipation is provided.
Farebay Is provided Io capture sediment and minimize clean-out problems.
/j92S" Uncompacted natural soils are utilized b promote vegetation and reduce sedunentation.
M44"' Seasonal high water table is at least 1 foot below bottom of basin.
'»a If used as a temporary sediment basin, plans indicate dean-out prior to final operation.
,yl A site specific operation and maintenance plan with the following provisions is provided.
The OEM agreement is signed by the responsible party and notarized.
'1

1
DWQ Project No.
DIVISION OF WATER QUALITY - GRASSED SWALE WORKSHEET
II

1. PROJECT INFORMATION (please complete the following information):
Project Name: VvES? LAAe-<'
Contact Person: Phone Number: f 9/91 s'-/ -7 g 6
Swale ID: orr--*'
Grass Swale Length 6?, ft
Tributary Drainage Area 0,0/ ac.
Impervious Area i let S ac.
Max. Velocity from 2 Yr. Storm _ 0 fps
Max. Velocity from 10 Yr. Storm o, fps
Min. side slopes = i rata
Steepest Effective Slope 3 ' Rift
Cover Crop G,BttsS
(at least 100 ft per tributary acre)
(on-site and off-site drainage to the swale)
(on-site and off-site drainage to the swale)
(2 fps max.)
(3:1 min.)
(check dams may be used)
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
t?I Vegetation Plan provided on plans
,06S' The underlying soils are permeable and non-compacted
/ry1?f Swale carries only stormwater flow
Water table depth is greater than 1 foot
L r Plan details for the swale provided.
an details for the inlets and outlets are provided.
N I9ILr- Check dams provided.
/••4 The operation and maintenance agreement includes annual erosion and vegetation repair, and at least twice
annual mowing.
???L <; The operation and maintenance agreement signed and notarized by the responsible party is provided.
Civil Engineering & Planning
April 11, 2005 APR 1 12,005
Mr. Kevin Yates
US Army Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
pEN AND S TTORMWIUI7ER BRANCH
Ms. Cyndi Karoly
NC Division of Water Quality
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Re: Pre-Construction Notification Application Form for West Lake Subdivision -
Phase 1, in Cary, NC (WakeCounty)
Dear Mr. Yates and Ms. Karoly,
Attached is the completed PCN Application Form for proposed wetland, surface water,
and Neuse River Buffer impacts required for West Lake Subdivision - Phase 1 (PIN
0679.01-27-9795) in Cary (Wake County). The site covers 89.9 acres (Phase 1
43.1 acres), northeast of the intersection of West Lake Road and Optimist Farm Road and
is in the Neuse River Basin. Jurisdictional wetlands on this site were delineated and an
on-site meeting was held with Ms. Jennifer Burdette on October 7, 2004. On September
16, 2004, Ms. Debbie Edwards of NC D WQ conducted a Neuse River Buffer
concurrence meeting and issued a buffer determination (DWQ EXP# 04-1508). A site
plan labeled "West Lake Subdivision - Wetland, Surface Water, and Neuse River Buffer
Impact Map (Drawing Sheet WL-1.0)" is attached to illustrate proposed impacts.
Proposed impacts in Impact Area #1:
Neuse River Buffer Impacts - Zone 1 4451.76 sqft (0.1022 ac)
Neuse River Buffer Impacts - Zone 2 4493.58 sqft (0.1033 ac)
Wetland Impacts 6655.44 sqft (0.1528 ac)
Surface Water Impacts 1998.92 sqft (0.0459 ac)
The proposed impacts are required for the installation of a street, storm drainage, lot
grading, and the installation of a Town of Cary required 10' concrete multi-use trail. The
position of the street is dependent on the Town of Cary requirement that the street begin
directly opposite the street across West Lake Road.
Proposed impacts in Impact Area #2:
Wetland Impacts
1611.48 sqft (0.0370 ac)
The proposed impact is required for the installation of a street and a Town of Cary
required greenway easement.
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
Proposed impacts in Impact Area #3:
Neuse River Buffer Impacts - Zone 1 86.27 sqft (0.0020 ac)
Temporary Neuse River Buffer Impacts - Zone 2 1351.95 sqft (0.0310 ac)
Wetland Impacts 2290.71 sgft (0.0526 ac)
The proposed impacts are required for the installation of a sanitary sewer that will
provide sewer access to half of the lots in the subdivision. The wetland area was crossed
in a perpendicular manner at one of its narrowest points. The sanitary sewer was also
positioned to completely eliminate stream impacts.
Please do not hesitate to contact me if you have questions, comments or concerns about
this application. Thank you in advance for your time spent reviewing this permit
application.
Sincerely,
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
0MJ V_a.:
APP 1 1 2005
DENR - WATER QUAD
Office Use Only: Form version May 2002
USACE Action ID No. DWO 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
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide Permit #39
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 Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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 details), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: D. I
Mailing Address: 2000 Aerial Center Parkway
Suite 110
Morrisville, North Carolina 27560
Telephone Number: 919.460.2995 Fax Number: 919.469.5406
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: Shawn Guyer
Company Affiliation: Spaulding & Norris, PA
Mailing Address: 972 Trinity Road
Raleigh, North Carolina 27607
Telephone Number: 919.854.7990 Fax Number: 919.854.7925
E-mail Address: [e-mail]
Page 5 of 13
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: Westlake Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0679.01-27-9795
4. Location
County: Wake Nearest Town: Holly Springs, NC
Subdivision name (include phase/lot number): Westlake Subdivision Phase 1
Directions to site (include road numbers, landmarks, etc.): Traveling South on US-401 from
US-40/440, go 7.4 miles. Turn right onto Ten-Ten Road, travel 3.7 miles. Turn left onto
West Lake Road, travel 1.4 miles. Site is on left (east) side of road before the intersection of
West Lake Road and Optimist Farm Road.
5. Site coordinates, if available (UTM or Lat/Long): 78.75278 West (Longitude),
35.66937 North (Latitude)
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 85.90 acres total (Phase 1 - 43.1 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): Bells Lake (Index # 27-43-15-6;
Classification C.NS )n
8. River Basin: Neuse (Subbasin # 03-04-03: USGS Cataloging Unit: 03020201)
(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/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site landuse is comprised of field/pasture and mixed
woodland. There are public schools located to the west of the site, residential subdivisions to
the north and east of the site, and a school and residential subdivision to the south.
10. Describe the overall project in detail, including the type of equipment to be used: The
project entails the development of a residential subdivision and the associated infrastructure,
including: roads, water supply, and sanitary and storm sewers. Equipment used will include,
but is not limited to trackhoe excavators, bulldozers, rollers, asphalt pavers, and other
grading and road construction equipment.
11. Explain the purpose of the proposed work: The purpose of the proposed work is to provide
the necessary infrastructure to support a residential subdivision of single family homes
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.
This is the first permit application for this site. Ms. Debbie Edwards of NC DWQ conducted a
Neuse River Buffer concurrence meeting on September 16, 2004. A site visit was conducted
with Ms. Jennifer Burdette of the USACE on October 7 2004
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.
The Owner anticipates submittal of a permit request for Phase 2 of the site.
Page 7 of 13
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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: The proposed impacts include
permanent and temporary impacts to wetlands, surface waters, and Neuse River Buffers resulting
from lot fill, a road crossing, and the installation of a sanitary sewer.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain**
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.1528
No
0 (to pond)
Freshwater marsh
Impact Area #2 Road grading &
greenway 0.0370 No 425 Forested Wetland
Impact Area #3 Sanitary sewer 0.0526 No 25 Forested Wetland

* List each impact separately and identify temporary impacts. 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.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online athttp://www.fema.po .
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 1.4668 Acres
Total area of wetland impact proposed: 0.2480 Acres
Page 8 of 13
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
indicate on ma
Type of Impact* Length of
Impact
linear feet
Stream Name*" Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)
None

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, 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.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usas.Qov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mapquest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: N/A
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact" Area of
Impact
acres
Name of Wate)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.

Impact Area #I Lot grading, road
grading, & storm
drainage
0.0459
unnamed
Farm Pond

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. 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.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
Page 9 of 13
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.
The project layout was specifically designed to avoid and minimize potential impacts to
streams, wetlands, surface waters, and Neuse River Buffers as shown on sheet WL-1.0 "West
Lake Subdivision - Wetland. Surface Water, and Neuse River By er Impact Map ". Impact Area
#1, the roadway crossing the small pool, the wetland area, and the upper end of the pond,was
positioned based on Town of Cary requirements. The Town of Cary required that Street A begin
directly across from the existing street on the opposite side of West Lake Road. Limitations of
curvature and lot positioning further hindered minimization of the impacts. AdditionallX the
Town of Cary required the installation of a 10' wide concrete multi-use trail on the south side of
Street A.
The eenway easement resulting in the wetland impact at Impact Area #2 was required by the
Town of Cary. The easement and the street were shifted as far as possible away from the
wetland to minimize the wetland impact.
The sanitary sewer at Impact Area #3 was required to provide sewer access to almost half of the
lots in the subdivision. The wetland area was crossed in a perpendicular manner at one of its
narrowest points. The sanitary sewer was also positioned to completely eliminate stream
impacts.
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.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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.
Page 10 of 13
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 NCWRP 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/strmaide.html.
Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The owner does not propose any mitigation for the project.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): None
Amount of buffer mitigation requested (square feet): None
Amount of Riparian wetland mitigation requested (acres): None
Amount of Non-riparian wetland mitigation requested (acres): None
Amount of Coastal wetland mitigation requested (acres): None
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
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 ?
Page 11 of 13
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.
Will the project impact protected riparian buffers identified within 15A NCAC 213 .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 213 .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
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
s uare feet Multiplier Required
Miti ation
1 4452 Perm 3
2 (4494 Perm, 1352 Temp) 1.5
Total (8946 Perm, 1352 Temp)
* Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or .0260.
No buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
Page 12 of 13
There are 0. 13 acres of impervious area from existing structures on the 43.10 acre property. The
proposed development includes 5.05 acres of impervious surfaces, comprised of streets and
sidewalks. These surfaces account for approximately 11.7% of the overall site area, allowing for
an additional 7.88 acres of impervious surfaces for buildings, driveways, walkways and patios
before the 30% impervious area threshold is reached. The remaining 7.88 acres of impervious
surfaces would allow for approximately 4,575 square feet of impervious area per lot. The
impervious area for the average house on each lot is estimated at approximately 2,200 square feet
leaving 2,375 square feet of additional impervious area for driveways, wallcways, and patios.
2,375 square feet rg eatly exceeds the area estimated for those uses.
XU. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Wastewater generated from the proposed project will be collected by the Town of Cary sanitary
sewer system and treatment will be provided at the Town of Cary Middle Creek Wastewater
Treatment Facility.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
XIV. 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).
Oaf. it , Z.v65
ApplicantAg`ent's Signature Q Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
Civil Engineering & Planning
AGENT AUTHORIZATION FORM
ALL BLANKS TO BE FILLED IN BY CURRENT LANDOWNER
Name:
Address:
Phone: q I 1/ -l (r0 - z9 q 5
Project Name/Description: Westlake Subdivision / Residential development
Date: t u MnAo L ZC05
The Department of the Army
US Army Corps of Engineers
Wilmington District
PO Box 1890
Wilmington, NC 28402-1890
Attn: Mr. Kevin Yates
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting & Permitting
To Whom It May Concern:
I, the current property owner, hereby designate and authorize Spaulding & Norris, P.A.,
to act on my behalf as my agent in the processing of permit applications, to furnish upon
request supplemental information in support of applications, etc., from this day forward.
This the (aday of /?t11(:. k , ZW 5
This notification supercedes any previous correspondence concerning the agent for this
project.
PRINT Owner's Name
PROPERTY Owner's Signature
Cc: Mr. John Dorney
NCDENR - Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607

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Division of Watev 01811ty
Michael F. Easley, Governor William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
September 16, 2004
DWQ EXP # 04-1508
Wake County
D.R. Horton, Inc.
Attn: Britt Spivey
3939 Browning Place
Raleigh, NC 27609
Subject Property: West Lake
UT to Middle Creek *303(d) listed waters
On-Site Determination for Applicability to the Neuse #tiver Riparian Area Protection Rules
(15A NCAC 2B .0233)-EXPRESS REVIEW PROGRAM
Dear Mr. Spivey: \
On September 16, 2004, at your request I-conducted an on-site. determination to review six (6)
features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC
2B.0233). The features are labeled as "A, B, C, D, E and F" on the attached maps initialed by
me on September 16, 2004.
The Division of Water Quality (DWQ) has determined that the features labeled as "A. B
and C" on the attached maps are subject to the Neuse Buffer Rule. The origins have been
delineated in the field and flagged. The feature on the west side of the property includes
three ponds and two stream segments that connect them. Pond A and B are. both subject,
the segment between pond A and B is subject from flag E134 through to nag E119. The
segment below pond B, which is Identified as E is not subject. Pond F is not connected and
therefore is not subject. Feature C is subject from flag SOl through to the eastern
property boundary. Feature D is not subject. These features and their associated buffers
should be identified on any future plans for this property. The owner (or future owners) should
notify the DWQ (and other relevant agencies) of this decision in any future correspondences
concerning this property. This on-site determination shall expire five (5) years from the date of
this letter.
Landowners or affected parties that dispute a determination made by the DWQ or Delegated
Local Authority that a surface water exists and that it is subject to the buffer rule may request a
determination by the Director. A request for a determination by the Director shall be referred 1110
the Director in writing c/o John Dorney, DWQ Wetlands/401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604-2260. Individuals that dispute a determination by the DWQ or Delegated
401 Wetlands Certification Unit
1650 Mad service Center, Raleigh, North Carolina 27699-1650 One
2321 Crabtree Boulevard, suite 250, Raleigh North'Carodna 27604 NorthCarohna
Phone: [phone] /FAX [phone]/ Internet httnJ/h2o.enr.state.nc.us/ncwetlands AgAmally
An Equal opportunity/Atdrrnative Action Employer-50% Recycled110% Post Consumer Paper
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9/16/04
Local Authority that "exempts" a surface water from the buffer rule may ask for an adjudicatory
hearing. You must act wiflAn 60 days of.the date that y_ou receive this letter. Applicants are
hereby notified that the 60-day status ory appeal time does not start until the affected party
(including downstream and adjacent landdwriers) is notified of this decision. DWQ recommends
that the applicant conduct this notification in order to be certain that third party appeals are made
in a timely manner. To ask for a hearing, send a written petition, which conforms to Chapter
150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, N.C. 27699-6714. This determination is final and binding unless you
ask for a hearing within 60 days.
This letter only addresses the applicability to the buffer rules and does not approve any activity
within the buffers. Nor does this letter approve any activity within Waters of the United States
or Waters of the State. If you have any additional questions or require additional information
please call Debbie Edwards at [phone].
Sincerely,
Alan k. Klimek, P.E.
AWK/dae
Attachments: Wake County Soil Survey map
USGS Apex Quad map
cc: Mike Horan, DWQ Raleigh Regional Office
File Copy
Central Files
Jason Payne-S&EC
Filename 041508WestLake(Wake)EXP+ortgln

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12/17/03
Figure 1- USGS Map
West Lake
Elam, Todd, & d'Ambrosi
Wake County
Apex Quadrangle
SEP 1 0 2004
WATER QUALITY SECTft
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com

Project is Scale:
U78.W1 1:15840
Project Date:
Mlgr.: SC
12/1 7/03
Figure 2 - Soil Survey
West Lake
Elam, Todd, & d'Ambrosi
Wake County
Sheet 84
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
Web Page: www.SandEC.com

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WAKE COUNTY, NORTH CAROLINA - SHEET NUMBER 84
oS - DLPI
rl?;J
Ecos stem
PROGRAM
September 13, 2005
Shawn Guyer
Spaulding & Norris, PA
972 Trinity Road
Raleigh, NC 27607
od?D
Q 12?0`a
SEP 2 .
?,DENRA?DRt1? ?9RN'?H
?D
Project: West Lake Subdivision, Phase II County: Wake
The purpose of this letter is to notify you that the North Carolina Ecosystem Enhancement Program (NC EEP) is willing to
accept payment for impacts associated with the above referenced project. Please note that this decision does not assure that
the payment will be approved by the permit issuing agencies as mitigation for project impacts. It is the responsibility of the
applicant to contact these agencies to determine if payment to the NC EEP will be approved.
This acceptance is valid for six months from the date of this letter. If we have not received a copy of the issued 404
Permit/401 Certification within this time frame, this acceptance will expire. It is the applicant's responsibility to send
copies of the 404/401/CAMA permits to NC EEP. Once NC EEP receives a copy of the 404 Permit and/or the 401
Certification an invoice will be issued and payment must be made.
Based on the information supplied by you the impacts that may require compensatory mitigation are summarized in the
following table.
River Basin Wetlands Stream Buffer Buffer
Cataloging (Acres) (Linear Feet) Zone 1 Zone 2
Unit (Sq. Ft.) (Sq. Ft.)
Riparian Non-Riparian Coastal Marsh Cold Cool Warm
Neuse 0 0 0 0 0 0 182 2,307
03020201
Upon receipt of payment, EEP will take responsibility for providing the compensatory mitigation for the permitted impacts
up to a 2:1 ratio, (buffers, Zone 1 at a 3:1 ratio and Zone 2 at a 1.5:1 ratio). The type and amount of the compensatory
mitigation will be as specified in the Section 404 Permit and/or 401 Water Quality Certification, and/or CAMA Permit. The
mitigation will be performed in accordance with the Memorandum of Understanding between the N. C. Department of
Environment and Natural Resources and the U. S. Army Corps of Engineers dated November 4, 1998.
If you have any questions or need additional information, please contact Carol Shaw at [phone].
Si erely,
Wi ' in D. Gilmore, PE
Director
cc: Cyndi Karoly, Wetlands/401 Unit
Monty Matthews, USACE - Raleigh
Eric Kulz, DWQ Regional Office - Raleigh
File
Restop' ... ... Prot"' Oar Stan, ®??
Acuff
North Carolina Ecosystem Enhancement Program, 1652 Mail Service Center, Raleigh, NC 27699-1652 / 91 9-71 5-0476 / www.nceep.net
R
SPAULDING & NORRIS, PA
Planning ? Civil Engineering ? Environmental
September 7, 2005
S&N Project # 556-05
DWQ Project # 2005-0613
Mr. Sam Aghimien
North Carolina Division of Water Quality
401 Oversight and Express Permits Unit
2321 Crabtree Blvd
Raleigh, NC 27604
Dear Mr. Aghimien,
I am sending you the areas you requested during our conversation yesterday afternoon.
I would like to first reiterate that it has always been our understanding that site imperviousness is
based upon the amount of impervious area on the site compared to the overall site area. This is
clearly specified in section XI of the most recent version of the NC DWQ/USACE Pre-
Construction Notification Form:
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.
In Phase I of West Lake Subdivision, there are approximately 3.28 acres of surface
waters in the form of a farm pond. Around that pond and a small segment of stream on the
eastern boundary of the property there are approximately 1.60 acres of Neuse Riparian Buffers.
Please call if you have any more questions.
sincerely,
Shawn F. Guyer, EIT
Environmental Engineering Assistant
CC: Ms. Debbie Edwards, NC DWQ
P 9 2005
C)( WATER QUALITY
WETLAf; 6„Vi7 STORMWATER BRANCH
Phone: [phone] * Fax: [phone] Trinity Road • Raleigh, North Carolina 27607
050613
Civil Engineering & Planning
t,
April 11, 2005
Mr. Kevin Yates
US Army Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615

a[NoRod§
p
APR 1 1 2005
Ms. Cyndi Karoly
NC Division of Water NR QUALITY
Q?iosnW NOsMMarsRl
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Re: Pre-Construction Notification Application Form for West Lake Subdivision -
Phase 1, in Cary, NC (WakeCounty)
Dear Mr. Yates and Ms. Karoly,
Attached is the completed PCN Application Form for proposed wetland, surface water,
and Neuse River Buffer impacts required for West Lake Subdivision - Phase 1 (PIN
0679.01-27-9795) in Cary (Wake County). The site covers 89.9 acres (Phase 1
43.1 acres), northeast of the intersection of West Lake Road and Optimist Farm Road and
is in the Neuse River Basin. Jurisdictional wetlands on this site were delineated and an
on-site meeting was held with Ms. Jennifer Burdette on October 7, 2004. On September
16, 2004, Ms. Debbie Edwards of NC DWQ conducted a Neuse River Buffer
concurrence meeting and issued a buffer determination (DWQ EXP# 04-1508). A site
plan labeled "West Lake Subdivision - Wetland, Surface Water, and Neuse River Buffer
Impact Map (Drawing Sheet WL-1.0)" is attached to illustrate proposed impacts.
Proposed impacts in Impact Area #1:
Neuse River Buffer Impacts - Zone 1 4451.76 sqft (0.1022 ac)
Neuse River Buffer Impacts - Zone 2 4493.58 sgft (0.1033 ac)
Wetland Impacts 6655.44 sqft (0.1528 ac)
Surface Water Impacts 1998.92 sqft (0.0459 ac)
The proposed impacts are required for the installation of a street, storm drainage, lot
grading, and the installation of a Town of Cary required 10' concrete multi-use trail. The
position of the street is dependent on the Town of Cary requirement that the street begin
directly opposite the street across West Lake Road.
Proposed impacts in Impact Area 42:
Wetland Impacts
1611.48 sgft (0.0370 ac)
The proposed impact is required for the installation of a street and a Town of Cary
required greenway easement.
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
Proposed impacts in Impact Area #3:
Neuse River Buffer Impacts - Zone 1 86.27 sqft (0.0020 ac)
Temporary Neuse River Buffer Impacts - Zone 2 1351.95 sqft (0.0310 ac)
Wetland Impacts 2290.71 sqft (0.0526 ac)
The proposed impacts are required for the installation of a sanitary sewer that will
provide sewer access to half of the lots in the subdivision. The wetland area was crossed
in a perpendicular manner at one of its narrowest points. The sanitary sewer was also
positioned to completely eliminate stream impacts.
Please do not hesitate to contact me if you have questions, comments or concerns about
this application. Thank you in advance for your time spent reviewing this permit
application.
Sincerely,
'44"? y4l?? .
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
W
APR Y 1 2005
WETLQM
ANDSTORAIyyATERWNCH Fo Ve. ion May 2002
Office Use Only:
015 a13
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
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide Permit #39
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 Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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 details), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: D. R. Horton
Mailing Address: 2000 Aerial Center Parkway
Suite 110
Morrisville. North Carolina 27560
Telephone Number: 919.460.2995 Fax Number: 919.469.5406
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: Shawn Guyer
Company Affiliation: Spaulding & Norris. PA
Mailing Address: 972 Trinity Road
Raleigh, North Carolina 27607
Telephone Number: 919.854.7990 Fax Number: 919.854.7925
E-mail Address: [e-mail]
Page 5 of 13
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: Westlake Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0679.01-27-9795
4. Location
County: Wake Nearest Town: Holly Springs, NC
Subdivision name (include phase/lot number): Westlake Subdivision Phase 1
Directions to site (include road numbers, landmarks, etc.): Traveling South on US-401 from
US-40/440, go 7.4 miles. Turn right onto Ten-Ten Road, travel 3.7 miles. Turn left onto
West Lake Road, travel 1.4 miles. Site is on left (east) side of road before the intersection of
West Lake Road and Optimist Farm Road.
5. Site coordinates, if available (UTM or Lat/Long): 78.75278 West (Longitude),
35.66937 North (Latitude)
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 85.90 acres total (Phase 1 - 43.1 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): Bells Lake (Index # 27-43-15-6;
Classification C:NS)D
8. River Basin: Neuse (Subbasin # 03-04-03; USGS Cataloging Unit: 03020201)
(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/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site landuse is comprised of field/pasture and mixed
woodland. There are public schools located to the west of the site, residential subdivisions to
the north and east of the site and a school and residential subdivision to the south
10. Describe the overall project in detail, including the type of equipment to be used: The
project entails the development of a residential subdivision and the associated infrastructure,
including: roads, water supply, and sanitary and storm sewers. Equipment used will include,
but is not limited to trackhoe excavators, bulldozers, rollers, asphalt pavers, and other
rg ading and road construction equipment.
11. Explain the purpose of the proposed work: The purpose of the proposed work is to provide
the necessary infrastructure to support a residential subdivision of single family homes
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.
This is the first permit application for this site. Ms. Debbie Edwards of NC DWQ conducted a
Neuse River Buffer concurrence meeting on September 16, 2004. A site visit was conducted
with Ms. Jennifer Burdette of the USACE on October 7, 2004.
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.
The Owner anticipates submittal of a permit request for Phase 2 of the site.
Page 7 of 13
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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: The pro spo ed impacts include
permanent and temporary impacts to wetlands, surface waters, and Neuse River Buffers resulting
from lot fill, a road crossing, and the installation of a sanitary sewer.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain"
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.1528
No
0 (to pond)
Freshwater marsh
Impact Area #2 Road grading &
greenway 0.0370 No 425 Forested Wetland
Impact Area #3 Sanitary sewer 0.0526 No 25 Forested Wetland

• List each impact separately and identify temporary impacts. 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.
*• 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online athttp://www.fema.go .
•** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 1.4668 Acres
Total area of wetland impact proposed: 0.2480 Acres
Page 8 of 13
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
indicate on ma
Type of Impact* Length of
Impact
linear feet
Stream Name* * Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)
None

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, 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.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usas.gov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mapquest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: N/A
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres
Name of Wate)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.

Impact Area #I Lot grading, road
grading, & storm
drainage
0.0459
unnamed
Farm Pond

• List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. 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.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
Page 9 of 13
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.
The project layout was specifically designed to avoid and minimize potential impacts to
streams wetlands surface waters and Neuse River Buffers as shown on sheet WL-1 0 "West
Lake Subdivision - Wetland. Surface Water, and Neuse River Buer Impact Map ". Impact Area
#1, the roadway crossing the small pool, the wetland area, and the upper end of the pond.was
positioned based on Town of Cary requirements. The Town of Cary required that Street A begin
directly across from the existing street on the opposite side of West Lake Road. Limitations of
curvature and lot positioning further hindered minimization of the impacts. Additionally the
Town of Cary required the installation of a 10' wide concrete multi-use trail on the south side of
Street A.
The greenway easement resulting in the wetland impact at Impact Area #2 was required by the
Town of Cary. The easement and the street were shifted as far as possible away from the
wetland to minimize the wetland impact.
The sanitary sewer at Impact Area #3 was required to provide sewer access to almost half of the
lots in the subdivision. The wetland area was crossed in a perpendicular manner at one of its
narrowest points. The sanitary sewer was also positioned to completely eliminate stream
impacts.
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.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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.
Page 10 of 13
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 NCWRP 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 (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The owner does not propose any mitigation for the project.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): None
Amount of buffer mitigation requested (square feet): None
Amount of Riparian wetland mitigation requested (acres): None
Amount of Non-riparian wetland mitigation requested (acres): None
Amount of Coastal wetland mitigation requested (acres): None
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
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 ?
Page 11 of 13
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.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
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
(square feet Multiplier Required
Mitigation
1 4452 Perm 3
2 (4494 Perm, 1352 Temp) 1.5
Total (8946 Perm, 1352 Temp)
• Zone 1 extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or.0260.
No buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
Page 12 of 13
There are 0. 13 acres of impervious area from existing structures on the 43.10 acre property. The
proposed development includes 5.05 acres of impervious surfaces, comprised of streets and
sidewalks. These surfaces account for approximately 11.7% of the overall site area, allowing for
an additional 7.88 acres of impervious surfaces for buildings, driveways, walkways and patios
before the 30% impervious area threshold is reached. The remaining 7.88 acres of impervious
surfaces would allow for approximately 4,575 square feet of impervious area per lot. The
impervious area for the average house on each lot is estimated at approximately 2,200 square feet
leaving 2,375 square feet of additional impervious area for driveways, walkways. and patios.
2,375 square feet greatly exceeds the area estimated for those uses.
XH. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Wastewater generated from the proposed project will be collected by the Town of Cary sanitarX
sewer system and treatment will be provided at the Town of Cary Middle Creek Wastewater
Treatment Facility.
XIH. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes El No
Is this an after-the-fact permit application?
Yes ? No
XIV. 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).
CY.(I,z065
ApplicantKAgent's Signature Q Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
Civil Engineering & Planning
AGENT AUTHORIZATION FORM
ALL BLANKS TO BE FILLED IN BY CURRENT LANDOWNER
Name:
Address:
Phone: q
Project Name/Description: Westlake
)- Zgg5
ivision / Residential development
Date: 1(P A42A,-,- L 7- 005
The Department of the Army
US Army Corps of Engineers
Wilmington District
PO Box 1890
Wilmington, NC 28402-1890
Attn: Mr. Kevin Yates
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting & Permitting
To Whom It May Concern:
I, the current property owner, hereby designate and authorize Spaulding & Norris, P.A.,
to act on my behalf as my agent in the processing of permit applications, to furnish upon
request supplemental informaAt?'on in support of applications, etc., from this day forward.
This the day of /Vt AC k I ZODJ
This notification supercedes any previous correspondence concerning the agent for this
project.
v1b 1 L tA0W 1sW
PRINT Owner's Name
Cc: Mr. John Dorney
NCDENR - Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
PROPERTY Owner's Signature
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
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Division of Water Omlity
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
September 16, 2004
DWQ EXP # 04-1508
Wake County
D.R. Horton, Inc.
Attn: Britt Spivey
3939 Browning Place
Raleigh, NC 27609
Subject Property:

West Lake
UT to Middle Creek *303(d) listed waters
On-Site Determination for Applicability to the Neuse River Riparian Area Protection Rules
(15A NCAC 2B .0233)-EXPRESS REVIEW PROGRAM
Dear Mr. Spivey: \
On September 16, 2004, at your request I-conducted an on-site. determination to review six (6)
features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC
2B .0233). The features are labeled as "A, B, C, D, E and F" on the attached maps initialed by
me on September 16, 2004.
The Division of Water Quality (DWQ) has determined that the features labeled as "A. B
and C" on the attached maps are subject to the Neuse Buffer Rule. The origins have been
delineated in the field and flagged. The feature on the west side of the property includes
three ponds and two stream segments that connect them. Pond A and B are.both subject,
the segment between pond A and B is subject from flag E134 through to flag E119. The
segment below pond B, which is identified as E is not subject. Pond F is not connected and
therefore is not subject. Feature C is subject from flag S01 through to the eastern
property boundary. Feature D is not subject. These features and their associated buffers
should be identified on any future plans for this property. The owner (or future owners) should
notify the DWQ (and other relevant agencies) of this decision in any future correspondences
concerning this property. This on-site determination shall expire five (5) years from the date of
this letter.
Landowners or affected parties that dispute a determination made by the DWQ or Delegated
Local Authority that a surface water exists and that it is subject to the buffer rule may request a
determination by the Director. A request for a determination by the Director shall be referred tb
the Director in writing c/o John Dorney, DWQ Wetlands/401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604-2260. Individuals that dispute a determination by the DWQ or Delegated
401 Wetlands Certification Unit
1650 Mal Servioe Center, Raleigh, North Carolina 27699-1650 One
2321 Crabtree Boulevard, Suite 250, Raleigh, North?carol na 27604 North Carolina
Phone: [phone] /FAX [phone]/ Internet htto://h2o.enr.state.nc.us/ncwetlands Naturally
An Equal opportunWAf nnative Action Employer - 50% Recycled110% Post Consumer Paper
9/16/04
Local Authority that "exempts" a surface water from the buffer rule may ask for an adjudicatory
hearing. You must act within 60 days of.the date that you receive this letter. Applicants are
hereby notified that the 60-day statWos v appeal time does not start until the affected party
(including downstream and adjacent lan&wners) is notified of this decision. DWQ recommends
that the applicant conduct this notification in order to be certain that third party appeals are made.
in a timely manner. To ask for a hearing, send a written-petition, which conforms to Chapter
150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, N.C. 27699-6714. This determination is final and binding unless you
ask for a hearing within 60 days.
This letter only addresses the applicability to the buffer rules and does not approve any activity
within the buffers. Nor does this letter approve any activity within Waters of the United States
or Waters of the State. If you have any additional questions or require additional information
please call Debbie Edwards at [phone].
Sincerely,
V ,
Alan . Klimek, P.E.
AWK/dae
Attachments: Wake County Soil Survey map
USGS Apex Quad map
cc: Mike Horan, DWQ Raleigh Regional Office
File Copy
Central Files
Jason Payne-S&EC
Filename 041508WestLake(Wake)EXP+or1gia

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Wake County
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SEP 1 0 2004
WATER QUALITY SECTION
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
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West Lake
12/17/03 Elam, Todd, & d'Ambrosi '
Wake County
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WAKE COUNTY, NORTH CAROLINA - SHEET NUMBER 84
972'1'rinity Road TEL [phone]
Raleigh, North Carolina 27607 n?4?919.854.7925
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Transmittal
APR 1 1 2005
Date: 04.11.2005 Job. No: 556-05
DENR - WATT=P' WA ER BRANCH
VIET g ANO STORMBATER BRANCH
To: NC Division of Water Quality, Central Office
2521 Crabtree Boulevard
Raleigh, NC 27604-2260
Attn: Ms. Cyndi Karoly
Re: PCN Application for West Lake Subdivision - Phase 1, Cary, NC
Sending:
® Attached ? Under separate cover the following
via items:
® Prints/Plans ? Shop Drawings ? Specifications ? Samples
? Other:
Copies Date Description
04.11.2009 Completed PCN Application Package
1 04.11.200.c; Permit Application Fee

Transmitted for:
® Your use ? Approved as submitted ? Resubmit ? Copies for approval
? As requested ? Approved as noted ? Submit ? Copies for distribution
? Review and comment ? Returned for ? Return ? Corrected prints
Remarks Ms. Karoly - Please find attached 7 copies of the completed PCN Application for
West Lake Subdivision - Phase 1. located inCarv_ North Carolina-
Copy to: CGC.??
Shawn Guyer
bbb X0613
05061 3
April 11, 2005
Civil Engineering & Planning
Mr. Kevin Yates
US Army Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
Q?@ [2 odgi P
APR 1 1 2005
DENR - WATER QUALITY
Ms. Cyndi Karoly WETLANDS AND STORMWATER BRANCH
NC Division of Water Quality
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Re: Pre-Construction Notification Application Form for West Lake Subdivision -
Phase 1, in Cary, NC (WakeCounty)
Dear Mr. Yates and Ms. Karoly,
Attached is the completed PCN Application Form for proposed wetland, surface water,
and Neuse River Buffer impacts required for West Lake Subdivision - Phase 1 (PIN
0679.01-27-9796) in Cary (Wake County). The site covers 89.9 acres (Phase 1
43.1 acres), northeast of the intersection of West Lake Road and Optimist Farm Road and
is in the Neuse River Basin. Jurisdictional wetlands on this site were delineated and an
on-site meeting was held with Ms. Jennifer Burdette on October 7, 2004. On September
16, 2004, Ms. Debbie Edwards of NC DWQ conducted a Neuse River Buffer
concurrence meeting and issued a buffer determination (DWQ EXP# 04-1508). A site
plan labeled "West Lake Subdivision - Wetland, Surface Water, and Neuse River Buffer
Impact Map (Drawing Sheet WL-1.0)" is attached to illustrate proposed impacts.
Proposed impacts in Impact Area #1:
Neuse River Buffer Impacts - Zone 1 4451.76 sgft (0.1022 ac)
Neuse River Buffer Impacts - Zone 2 4493.58 sgft (0.1033 ac)
Wetland Impacts 6655.44 sgft (0.1528 ac)
Surface Water Impacts 1998.92 sgft (0.0459 ac)
The proposed impacts are required for the installation of a street, storm drainage, lot
grading, and the installation of a Town of Cary required 10' concrete multi-use trail. The
position of the street is dependent on the Town of Cary requirement that the street begin
directly opposite the street across West Lake Road.
Proposed impacts in Impact Area #2:
Wetland Impacts
1611.48 sgft (0.0370 ac)
The proposed impact is required for the installation of a street and a Town of Cary
required greenway easement.
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
Proposed impacts in Impact Area #3:
Neuse River Buffer Impacts - Zone 1 86.27 sgft (0.0020 ac)
Temporary Neuse River Buffer Impacts - Zone 2 1351.95 sqft (0.0310 ac)
Wetland Impacts 2290.71 sqft (0.0526 ac)
The proposed impacts are required for the installation of a sanitary sewer that will
provide sewer access to half of the lots in the subdivision. The wetland area was crossed
in a perpendicular manner at one of its narrowest points. The sanitary sewer was also
positioned to completely eliminate stream impacts.
Please do not hesitate to contact me if you have questions, comments or concerns about
this application. Thank you in advance for your time spent reviewing this permit
application.
Sincerely,
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
o c??c?adc? ?
Office Use Only: APR 1 1 2005 Form Version May 2002
DENR - W?ry "
USACE Action ID No. ..r„ ..?, LWU
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing
II.
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
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide Permit #39
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 Wetlands Restoration Program (NCWRP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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 details), check here: ?
Applicant Information
1. Owner/Applicant Information
Name: D. R. Horton
Mailing Address: 2000 Aerial Center Parkway
Morrisville, North Carolina 27560
Telephone Number: 919.460.2995 Fax Number: 919.469.5406
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: Shawn Guyer
Company Affiliation: Spaulding & Norris, PA
Mailing Address: 972 Trinity Road
Raleigh, North Carolina 27607
Telephone Number: 919.854.7990 Fax Number: 919.854.7925
E-mail Address: [e-mail]
Page 5 of 13
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: Westlake Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0679.01-27-9795
4. Location
County: Wake Nearest Town: Holly Springs, NC
Subdivision name (include phase/lot number): Westlake Subdivision Phase 1
Directions to site (include road numbers, landmarks, etc.): Traveling South on US-401 from
US-40/440, go 7.4 miles. Turn right onto Ten-Ten Road, travel 3.7 miles. Turn left onto
West Lake Road, travel 1.4 miles. Site is on left (east) side of road before the intersection of
West Lake Road and Optimist Farm Road.
5. Site coordinates, if available (UTM or Lat/Long): 78.75278 West (Longitude),
35.66937 North (Latitude)
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 85.90 acres total (Phase 1 - 43.1 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): Bells Lake (Index # 27-43-15-6;
Classification C;NS)D
8. River Basin: Neuse (Subbasin # 03-04-03; USGS Cataloging Unit: 03020201)
(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/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site landuse is comprised of field/pasture and mixed
woodland. There are public schools located to the west of the site, residential subdivisions to
the north and east of the site and a school and residential subdivision to the south
10. Describe the overall project in detail, including the type of equipment to be used: The
project entails the development of a residential subdivision and the associated infrastructure,
including: roads, water supply, and sanitary and storm sewers. Equipment used will include,
but is not limited to trackhoe excavators, bulldozers, rollers, asphalt pavers, and other
grading and road construction equipment.
11. Explain the purpose of the proposed work: The purpose of the proposed work is to provide
the necessary infrastructure to support a residential subdivision of single family homes
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.
This is the first permit application for this site. Ms. Debbie Edwards of NC DWQ conducted a
Neuse River Buffer concurrence meeting on September 16, 2004. A site visit was conducted
with Ms. Jennifer Burdette of the USACE on October 7 2004
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.
The Owner anticipates submittal of a permit request for Phase 2 of the site.
Page 7 of 13
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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: The proposed impacts include
permanent and temporary impacts to wetlands, surface waters, and Neuse River Buffers resulting
from lot fill, a road crossing, and the installation of a sanitary sewer.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain**
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.1528
No
0 (to pond)
Freshwater marsh
Impact Area #2 Road grading &
greenway 0.0370 No 425 Forested Wetland
Impact Area #3 Sanitary sewer 0.0526 No 25 Forested Wetland

• List each impact separately and identify temporary impacts. 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.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at htti)://www.fema.go v.
*** List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 1.4668 Acres
Total area of wetland impact proposed: 0.2480 Acres
Page 8 of ] 3
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
indicate on ma
Type of Impact* Length of
Impact
linear feet
Stream Name** Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)
None

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net loss/gain),
stabilization activities (cement wall, rip-rap, crib wall, 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.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usgs.gov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mMNuest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: N/A
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres
Name of Wat)
(if applicable) Type of Waterbody
(lake, pond, estuary, sound,
bay, ocean, etc.

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.0459
unnamed
Farm Pond

• List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. 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.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
Page 9 of 13
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.
The project layout was specifically designed to avoid and minimize potential impacts to
streams wetlands surface waters and Neuse River Buffers as shown on sheet WL-1.0 "West
Lake Subdivision - Wetland. Surface Water, and Neuse River Bu,?er Impact Map ". Impact Area
#1, the roadway crossing the small pool, the wetland area, and the upper end of the pond, was
positioned based on Town of Cary requirements. The Town of Cary required that Street A begin
directly across from the existing street on the opposite side of West Lake Road. Limitations of
curvature and lot positioning further hindered minimization of the impacts. Additionally, the
Town of Cary required the installation of a 10' wide concrete multi-use trail on the south side of
Street A.
The greenway easement resulting in the wetland impact at Impact Area #2 was required by the
Town of Cary. The easement and the street were shifted as far as possible away from the
wetland to minimize the wetland impact.
The sanitary sewer at Impact Area #3 was required to provide sewer access to almost half of the
lots in the subdivision. The wetland area was crossed in a perpendicular manner at one of its
narrowest points. The sanitary sewer was also positioned to completely eliminate stream
impacts.
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.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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.
Page 10 of 13
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 NCWRP 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 (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The owner does not propose any mitigation for the project.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http://h2o.enr.state.nc.us/wM/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): None
Amount of buffer mitigation requested (square feet): None
Amount of Riparian wetland mitigation requested (acres): None
Amount of Non-riparian wetland mitigation requested (acres): None
Amount of Coastal wetland mitigation requested (acres): None
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
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 ?
Page 11 of 13
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.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
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
(square feet Multiplier Required
Mitigation
1 4452 Perm 3
2 (4494 Perm, 1352 Temp) 1.5
Total (8946 Perm, 1352 Temp)
Gone 1 extends out ;ill feet perpendicular from near bank of channel; "Gone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or .0260.
No buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
Page 12 of 13
There are 0. 13 acres of impervious area from existing structures on the 43.10 acre property. The
proposed development includes 5.05 acres of impervious surfaces, comprised of streets and
sidewalks. These surfaces account for approximately 11.7% of the overall site area, allowing for
an additional 7.88 acres of impervious surfaces for buildings. driveways, walkways and patios
before the 30% impervious area threshold is reached. The remaining 7.88 acres of impervious
surfaces would allow for approximately 4,575 square feet of impervious area per lot. The
impervious area for the average house on each lot is estimated at approximately 2,200 square feet
leaving 2,375 square feet of additional impervious area for driveways, walkways, and patios.
2,375 square feet rg eatly exceeds the area estimated for those uses.
XH. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Wastewater generated from the proposed project will be collected by the Town of Cary sanitary
sewer system and treatment will be provided at the Town of Cary Middle Creek Wastewater
Treatment Facility.
XUL Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
XIV. 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).
oy. 11 , Z0o5
ApplicantKAgent's Signature Q Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
Civil Engineering & Planning
AGENT AUTHORIZATION FORM
ALL BLANKS TO BE FILLED IN BY CURRENT LANDOWNER
Name:
Address:
Phone: cf I c / W100 - Zq q 5
Project Name/Description: Westlake Subdivision / Residential development
Date: Ice mme-L 7005
The Department of the Army
US Army Corps of Engineers
Wilmington District
PO Box 1890
Wilmington, NC 28402-1890
Attn: Mr. Kevin Yates
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting & Permitting
To Whom It May Concern:
I, the current property owner, hereby designate and authorize Spaulding & Norris, P.A.,
to act on my behalf as my agent in the processing of permit applications, to furnish upon
request supplemental informat'on in support of a plications, etc., from this day forward.
This the ?(o day of /Md-, i 2XX7
This notification supercedes any previous correspondence concerning the agent for this
project.
bwl b acl'tMowlsw
PRINT Owner's Name
PRO RTY Owner's Signature
Cc: Mr. John Dorney
NCDENR - Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
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JOB NAME By y ?. -
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SUBJECT GLK ?5 / -70
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Water 04ality
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
September 16, 2004
DWQ EXP # 04-1508
Wake County
D.R. Horton, Inc.
Attn: Britt Spivey
3939 Browning Place
Raleigh, NC 27609
Subject Property:
West Lake
UT to Middle Creek *303(d) listed waters
On-Site Determination for Applicability to the Neuse River Riparian Area Protection Rules
(15A NCAC 2B .0233)-EXPRESS REVIEW PROGRAM
Dear Mr. Spivey: \
On September 16, 2004, at your request I-conducted an on-site, determination to review six (6)
features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC
2B .0233). The features are labeled as "A, B, C, D, E and F" on the attached maps initialed by
me on September 16, 2004.
The Division of Water Quality (DWQ) has determined that the features labeled as "A, B
and C" on the attached maps are subject to the Neuse Buffer Rule. The origins have been
delineated in the field and flagged. The feature on the west side of the property includes
three ponds and two stream segments that connect them. Pond A and B are. both subject,
the segment between pond A and B is subject from flag E134 through to flag E119. The
segment below pond B, which is identified as E is not subject. Pond F is not connected and
therefore is not subject. Feature C is subject from flag SOI through to the eastern
property boundary. Feature D is not subject. These features and their associated buffers
should be identified on any future plans for this property. The owner (or future owners) should
notify the DWQ (and other relevant agencies) of this decision in any future correspondences
concerning this property. This on-site determination shall expire five (5) years from the date of
this letter.
Landowners or affected parties that dispute a determination made by the DWQ or Delegated
Local Authority that a surface water exists and that it is subject to the buffer rule may request a
determination by the Director. A request for a determination by the Director shall be referred t*b
the Director in writing c/o John Domey, DWQ Wetlands/401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604-2260. Individuals that dispute a determination by the DWQ or Delegated
401 Wetlands Certification Unit
1650 Mail Service Center, Raleigh, North Carolina 27699-1650 One
2321 Crabtree Boulevard, Suite 250, Raleigh NaeCarorma 27604 NofthCarohna
Phone: [phone] / FAX [phone] / Internet htto:/Rr2o.enr.state.nc.us/ncwedands NW&MAY
An Equal opportunky/Atrumative Action Employer - 50% Recycled/10% Post Consumer Paper
Hage 2 of Z
9/16/04
Local Authority that "exempts" a surface water from the buffer rule may ask for an adjudicatory
hearing. You must act within 60 days 'of.the date that you receive this letter. Applicants are
hereby notified that the 60-day statutory appeal time does not start until the affected party
(including downstream and adjacent landowners) is notified of this decision. DWQ recommends
that the applicant conduct this notification in order to be certain that third party appeals are made.
in a timely manner. To ask for a hearing, send a written-petition, which conforms to Chapter
150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, N.C. 27699-6714. This determination is final and binding unless you
ask for a hearing within 60 days.
This letter only addresses the applicability to the buffer rules and does not approve any activity
within the buffers. Nor does this letter approve any activity within Waters of the United States
or Waters of the State. If you have any additional questions or require additional information
please call Debbie Edwards at [phone].
Sincerely,
Alan'V. Klimek, P.E.
4
AWK/dae
Attachments: Wake County Soil Survey map
USGS Apex Quad map
cc: Mike Horan, DWQ Raleigh Regional Office
File Copy
Central Files
Jason Payne-S&EC
Filename 041508WestLake(Wake)EXP+orig1n
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West Lake
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Wake County
Apex Quadrangle
SEP 1 0 2004
WATER QUALITY SECTION
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11010 Raven Ridge Rd.- Raleigh, NC 27614
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12/17/03 Elam, Todd, & d'Ambrosi
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Sheet 84
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1421
WAKE COUNTY, NORTH CAROLINA - SHEET NUMBER 84
Civil Engineering & Planning
April 11, 2005
Mr. Kevin Yates
US Army Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road
Suite 120
Raleigh, NC 27615
,P.A. 05061
16
APR 1 1 2005
Ms. Cyndi Karoly l 4NR - WA-ran OUAL
NC Division of Water Quality ?DSrgq?1'?' MWM
401 Oversight/Express Review Permitting
2321 Crabtree Boulevard
Suite 250
Raleigh, NC 27604 - 2260
Re: Pre-Construction Notification Application Form for West Lake Subdivision -
Phase 1, in Cary, NC (WakeCounty)
Dear Mr. Yates and Ms. Karoly,
Attached is the completed PCN Application Form for proposed wetland, surface water,
and Neuse River Buffer impacts required for West Lake Subdivision - Phase 1 (PIN
0679.01-27-9795) in Cary (Wake County). The site covers 89.9 acres (Phase 1
43.1 acres), northeast of the intersection of West Lake Road and Optimist Farm Road and
is in the Neuse River Basin. Jurisdictional wetlands on this site were delineated and an
on-site meeting was held with Ms. Jennifer Burdette on October 7, 2004. On September
16, 2004, Ms. Debbie Edwards of NC DWQ conducted a Neuse River Buffer
concurrence meeting and issued a buffer determination (DWQ EXP# 04-1508). A site
plan labeled "West Lake Subdivision - Wetland, Surface Water, and Neuse River Buffer
Impact Map (Drawing Sheet WL-1.0)" is attached to illustrate proposed impacts.
Proposed impacts in Impact Area #1:
Neuse River Buffer Impacts - Zone 1 4451.76 sqft (0.1022 ac)
Neuse River Buffer Impacts - Zone 2 4493.58 sqft (0.1033 ac)
Wetland Impacts 6655.44 sqft (0.1528 ac)
Surface Water Impacts 1998.92 sqft (0.0459 ac)
The proposed impacts are required for the installation of a street, storm drainage, lot
grading, and the installation of a Town of Cary required 10' concrete multi-use trail. The
position of the street is dependent on the Town of Cary requirement that the street begin
directly opposite the street across West Lake Road.
Proposed impacts in Impact Area #2:
Wetland Impacts
1611.48 sqft (0.0370 ac)
The proposed impact is required for the installation of a street and a Town of Cary
required greenway easement.
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
Proposed impacts in Impact Area #3:
Neuse River Buffer Impacts - Zone 1 86.27 sgft (0.0020 ac)
Temporary Neuse River Buffer Impacts - Zone 2 1351.95 sqft (0.0310 ac)
Wetland Impacts 2290.71 sgft (0.0526 ac)
The proposed impacts are required for the installation of a sanitary sewer that will
provide sewer access to half of the lots in the subdivision. The wetland area was crossed
in a perpendicular manner at one of its narrowest points. The sanitary sewer was also
positioned to completely eliminate stream impacts.
Please do not hesitate to contact me if you have questions, comments or concerns about
this application. Thank you in advance for your time spent reviewing this permit
application.
Sincerely,
Shawn F. Guyer, E.I.T
Environmental Engineering Assistant
(n T-1 DT M
APR 1 1 2005
Office Use Only: DENR - WATER DUALITY Form Version May 2002
WETLANDS AND STORMWATER BRANCH 050613
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
2. Nationwide, Regional or General Permit Number(s) Requested: Nationwide Permit #39
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 Wetlands Restoration Program (NC)ARP) is proposed for
mitigation of impacts (verify availability with NCWRP prior to submittal of PCN), 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 details), check here: ?
II. Applicant Information
1. Owner/Applicant Information
Name: D. R. Horton
Mailing Address: 2000 Aerial Center Parkway
Suite 110
Morrisville North Carolina 27560
Telephone Number: 919.460.2995 Fax Number: 919.469.5406
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: Shawn Guyer
Company Affiliation: Spaulding & Norris, PA
Mailing Address: 972 Trinity Road
Raleigh, North Carolina 27607Carolina 27607
Telephone Number: 919.854.7990 Fax Number: 919.854.7925
E-mail Address: shawn??pauldingnorris.com
Page 5 of 13
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: Westlake Subdivision
2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A
3. Property Identification Number (Tax PIN): 0679.01-27-9795
4. Location
County: Wake Nearest Town: Holly Springs, NC
Subdivision name (include phase/lot number): Westlake Subdivision Phase 1
Directions to site (include road numbers, landmarks, etc.): Traveling South on US-401 from
US-40/440, go 7.4 miles. Turn right onto Ten-Ten Road, travel 3.7 miles. Turn left onto
West Lake Road, travel 1.4 miles. Site is on left (east) side of road before the intersection of
West Lake Road and Optimist Farm Road.
5. Site coordinates, if available (UTM or Lat/Long): 78.75278 West (Longitude),
35.66937 North (Latitude)
(Note - If project is linear, such as a road or utility line, attach a sheet that separately lists the
coordinates for each crossing of a distinct waterbody.)
6. Property size (acres): 85.90 acres total (Phase 1 - 43.1 acres)
7. Nearest body of water (stream/river/sound/ocean/lake): Bells Lake (Index # 27-43-15-6;
Classification C;NS)D
8. River Basin: Neuse (Subbasin # 03-04-03, USGS Cataloging Unit: 03020201)
(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/.)
Page 6 of 13
9. Describe the existing conditions on the site and general land use in the vicinity of the project
at the time of this application: The site landuse is comprised of field/pasture and mixed
woodland. There are public schools located to the west of the site, residential subdivisions to
the north and east of the site and a school and residential subdivision to the south.
10. Describe the overall project in detail, including the type of equipment to be used: The
project entails the development of a residential subdivision and the associated infrastructure,
including: roads, water supply, and sanitary and storm sewers. Equipment used will include,
but is not limited to trackhoe excavators, bulldozers, rollers, asphalt pavers, and other
grading and road construction equipment.
11. Explain the purpose of the proposed work: The purpose of the proposed work is to provide
the necessary infrastructure to support a residential subdivision of single family homes
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.
This is the first permit application for this site. Ms. Debbie Edwards of NC DWQ conducted a
Neuse River Buffer concurrence meeting on September 16, 2004. A site visit was conducted
with Ms. Jennifer Burdette of the USACE on October 7 2004
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.
The Owner anticipates submittal of a permit request for Phase 2 of the site.
Page 7 of 13
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. The applicant must also
provide justification for these impacts in Section VII below. All proposed impacts, permanent
and temporary, must be listed herein, and must be clearly identifiable on an accompanying site
plan. All wetlands and waters, and all streams (intermittent and perennial) must 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: The proposed impacts include
permanent and temporary impacts to wetlands, surface waters, and Neuse River Buffers resulting
from lot fill, a road crossing, and the installation of a sanitary sewer.
2. Individually list wetland impacts below:
Wetland Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Located within
100-year Floodplain**
es/no Distance to
Nearest Stream
linear feet
Type of Wetland***

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.1528
No
0 (to pond)
Freshwater marsh
Impact Area #2 Road grading &
greenway 0.0370 No 425 Forested Wetland
Impact Area #3 Sanitary sewer 0.0526 No 25 Forested Wetland

• List each impact separately and identify temporary impacts. 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.
** 100-Year floodplains are identified through the Federal Emergency Management Agency's (FEMA) Flood Insurance Rate Maps
(FIRM), or FEMA-approved local floodplain maps. Maps are available through the FEMA Map Service Center at 1-800-358-9616, or
online at http://www.fema.gov.
**• List a wetland type that best describes wetland to be impacted (e.g., freshwater/saltwater marsh, forested wetland, beaver pond,
Carolina Bay, bog, etc.) Indicate if wetland is isolated (determination of isolation to be made by USACE only).
List the total acreage (estimated) of all existing wetlands on the property: 1.4668 Acres
Total area of wetland impact proposed: 0.2480 Acres
Page 8 of 13
3. Individually list all intermittent and perennial stream impacts below:
Stream Impact
Site Number
indicate on ma
Type of Impact* Length of
Impact
linear feet
Stream Name** Average Width
of Stream
Before Impact Perennial or
Intermittent?
leasespecify)
None

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: culverts and associated rip-rap,
dams (separately list impacts due to both structure and flooding), relocation (include linear feet before and after, and net losstgain),
stabilization activities (cement wall, rip-rap, crib wall, 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.
** Stream names can be found on USGS topographic maps. If a stream has no name, list as UT (unnamed tributary) to the nearest
downstream named stream into which it flows. USGS maps are available through the USGS at 1-800-358-9616, or online at
www.usgs.gov. Several internet sites also allow direct download and printing of USGS maps (e.g., www.topozone.com,
www.mapguest.com, etc.).
Cumulative impacts (linear distance in feet) to all streams on site: N/A
4. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.) below:
Open Water Impact
Site Number
indicate on ma
Type of Impact* Area of
Impact
acres Name of
Wate)
(if applicable) Type of Waterbody
(lake, and estuary,
bay, ocean,c sound,

Impact Area #1 Lot grading, road
grading, & storm
drainage
0.0459
unnamed
Farm Pond

* List each impact separately and identify temporary impacts. Impacts include, but are not limited to: fill, excavation, dredging,
flooding, drainage, bulkheads, etc.
5. 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.): N/A
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): N/A
Size of watershed draining to pond: N/A Expected pond surface area: N/A
Page 9 of 13
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.
The project layout was specifically designed to avoid and minimize potential impacts to
streams wetlands surface waters and Neuse River Buffers as shown on sheet WL-1 0 "West
Lake Subdivision - Wetland. Surface Water, and Neuse River Buffer Impact Map ". Impact Area
#1, the roadway crossing the small pool, the wetland area, and the upper end of the pond,was
positioned based on Town of Cary requirements. The Town of Cary required that Street A begin
directly across from the existing street on the opposite side of West Lake Road. Limitations of
curvature and lot positioning further hindered minimization of the impacts. Additionally, the
Town of Cary required the installation of a 10' wide concrete multi-use trail on the south side of
Street A.
The greenway easement resulting in the wetland impact at Impact Area #2 was required by the
Town of Cary. The easement and the street were shifted as far as possible away from the
wetland to minimize the wetland impact.
The sanitary sewer at Impact Area #3 was required to provide sewer access to almost half of the
lots in the subdivision. The wetland area was crossed in a perpendicular manner at one of its
narrowest points. The sanitary sewer was also positioned to completely eliminate stream
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.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on March 9, 2000, 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.
Page 10 of 13
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 NCWRP 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/strm-gide.htmi.
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 (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The owner does not propose any mitigation for the project.
2. Mitigation may also be made by payment into the North Carolina Wetlands Restoration
Program (NCWRP). Please note it is the applicant's responsibility to contact the NCWRP at
[phone] to determine availability and to request written approval of mitigation prior
to submittal of a PCN. For additional information regarding the application process for the
NCWRP, check the NCWRP website at http:Hh2o.enr.state.nc.us/wrp/index.htm. If use of
the NCWRP is proposed, please check the appropriate box on page three and provide the
following information:
Amount of stream mitigation requested (linear feet): None
Amount of buffer mitigation requested (square feet): None
Amount of Riparian wetland mitigation requested (acres): None
Amount of Non-riparian wetland mitigation requested (acres): None
Amount of Coastal wetland mitigation requested (acres): None
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state) funds or the use of public
(federal/state) land?
Yes ? No
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 ?
Page 11 of 13
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.
Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233
(Meuse), 15A NCAC 213 .0259 (Tar-Pamlico), 15A NCAC 2B .0250 (Randleman Rules and
Water Supply Buffer Requirements), or other (please identify )?
Yes ® No ? If you answered "yes", provide the following information:
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
(square feet Multiplier Required
Mitigation
1 4452 Perm 3
2 (4494 Perm, 1352 Temp) 1.5
Total (8946 Perm, 1352 Temp)
* Zone I extends out 30 feet perpendicular from near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation
of Property, Conservation Easement, Riparian Buffer Restoration / Enhancement, Preservation or
Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as
identified within 15A NCAC 2B .0242 or. 0260.
No buffer mitigation is required.
XI. Stormwater (required by DWQ)
Describe impervious acreage (both 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.
Page 12 of 13
There are 0. 13 acres of impervious area from existing structures on the 43.10 acre property. The
proposed development includes 5.05 acres of impervious surfaces, comprised of streets and
sidewalks. These surfaces account for approximately 11.7% of the overall site area, allowing for
an additional 7.88 acres of impervious surfaces for buildings, driveways, walkways and patios
before the 30% impervious area threshold is reached. The remaining 7.88 acres of impervious
surfaces would allow for approximately 4,575 square feet of impervious area per lot. The
impervious area for the average house on each lot is estimated at approximately 2,200 square feet
leaving 2,375 square feet of additional impervious area for driveways, walkways, and patios.
2,375 square feet greatly exceeds the area estimated for those uses.
XU. Sewage Disposal (required by DWQ)
Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of
wastewater generated from the proposed project, or available capacity of the subject facility.
Wastewater generated from the proposed pro ject will be collected by the Town of Cary sanitarX
sewer system and treatment will be provided at the Town of Cary Middle Creek Wastewater
Treatment Facility.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application?
Yes ? No
XIV. 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).
CY. (I , zC,o5
ApplicanAgent's Signature Q Date
(Agent's signature is valid only if an authorization letter from the applicant is provided.)
Page 13 of 13
Civil Engineering & Planning
AGENT AUTHORIZATION FORM
ALL BLANKS TO BE FILLED IN BY CURRENT LANDOWNER
Name:
Address:
Phone: cq I 1
Project Name/Description: Westlake
q5
i / Residential development
Date: t Q , L Z 0 Q 5
The Department of the Army
US Army Corps of Engineers
Wilmington District
PO Box 1890
Wilmington, NC 28402-1890
Attn: Mr. Kevin Yates
Field Office: Raleigh Regulatory Field Office
Re: Wetlands Related Consulting & Permitting
To Whom It May Concern:
I, the current property owner, hereby designate and authorize Spaulding & Norris, P.A.,
to act on my behalf as my agent in the processing of permit applications, to furnish upon
request supplemental information in support of a plications, etc., from this day forward.
This the j(o day of AIMC.k i VX
This notification supercedes any previous correspondence concerning the agent for this
project.
PRINT Owner's Name
PRO RTY Owner's Signature
Cc: Mr. John Dorney
NCDENR - Division of Water Quality
401 Wetlands Unit
1650 Mail Service Center
Raleigh, NC 27699-1650
Phone: [phone] ? Fax: [phone] ? 972 Trinity Road ? Raleigh, North Carolina 27607
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North Carolina Pepartment of Environment and Natural Resources
Division of Water 0milty
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
Alan W. Klimek, P.E., Director
September 16, 2004
DWQ EXP # 04-1508
Wake County
D.R. Horton, Inc.
Attn: Britt Spivey
3939 Browning Place
Raleigh, NC 27609
Subject Property:

West Lake
UT to Middle Creek *303(d) listed waters
On-Site Determination for Applicability to the Neuse River Riparian Area Protection Rules
(15A NCAC 2B.0233)-EXPRESS REVIEW PROGRAM
Dear Mr. Spivey: \
On September 16, 2004, at your request 1-conducted an on-site.. determination to review six (6)
features located on the subject property for applicability to the Neuse Buffer Rules (15A NCAC
2B.0233). The features are labeled as "A, B, C, D, E and F" on the attached maps initialed by
me on September 16, 2004.
The Division of Water Quality (DWQ) has determined that the features labeled as "A, B
and C" on the attached maps are subject to the Neuse Buffer Rule. The origins have been
delineated in the field and flagged. The feature on the west side of the property includes
three ponds and two stream segments that connect them. Pond A and B are, both subject,
the segment between pond A and B is subject from flag E134 through to flag E118. The
segment below pond B, which is identified as E is not subject. Pond F is not connected and
therefore is not subject. Feature C is subject from flag SOI through to the eastern
property boundary. Feature D is not subject. These features and their associated buffers
should be identified on any future plans for this property. The owner (or future owners) should
notify the DWQ (and other relevant agencies) of this decision in any future correspondences
concerning this property. This on-site determination shall expire five (5) years from the date of
this letter.
Landowners or affected parties that dispute a determination made by the DWQ or Delegated
Local Authority that a surface water exists and that it is subject to the buffer rule may request a
determination by the Director. A request for a determination by the Director shall be referred t*b
the Director in writing c/o John Dorney, DWQ Wetlands/401 Unit, 2321 Crabtree Blvd.,
Raleigh, NC 27604-2260. Individuals that dispute a determination by the DWQ or Delegated
401 wetlands Certification Unit
1650 Mail service Center, Raleigh, North Carolina 27699-1650 On.e, 7
2321 Crabtree Boulevard, suite 250, Raleigh, NorlhrCarorma 27604 Nol hCarohna
Phone: [phone] /FAX 919-730M/Internet htto://h2o.enr.state.nc.us/ncwetlands Nah"4471iff
An Equal opportunity/At6nnative Action Employer-50% Recyded/10% Post Consumer Paper
Page 2 of 2
9/16/04
Local Authority that "exempts" a surface water from the buffer rule may ask for an adjudicatory
hearing. You must act within 60 days of.the date that y_ou receive this letter. Applicants are
hereby notified that the 60-day statuosyv appeal time does not start until the affected party
(including downstream and adjacent landd ners) is notified of this decision. DWQ recommends
that the applicant conduct this notification in order to be certain that third party appeals are made.
in a timely manner. To ask for a hearing, send a written-petition, which conforms to Chapter
150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail
Service Center, Raleigh, N.C. 27699-6714. This determination is final and binding unless you
ask for a hearing within 60 days.
This letter only addresses the applicability to the buffer rules and. does not approve any activity
within the buffers. Nor does this letter approve any activity within Waters of the United States
or Waters of the State. If you have any additional questions or require additional information
please call Debbie Edwards at [phone].
Sincerely,
Alan. Klimek, P.E.
AWK/dae
Attachments: Wake County Soil Survey map
USGS Apex Quad map
cc: Mike Horan, DWQ Raleigh Regional Office
File Copy
Central Files
Jason Payne-S&EC
Filename 041508WestLake(Wake)EXP+or1g1n

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Figure 1- USGS Map
West Lake
Elam, Todd, & d'Ambrosi
Wake County
Apex Quadrangle
WATER QUALITY SECTION
Soil & Environmental Consultants, PA
11010 Raven Ridge Rd.- Raleigh, NC 27614
[phone] • [phone]
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Project Date: Soil & Environmental Consultants, PA
Mgr.: SC West Lake
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WAKE COUNTY, NORTH CAROLINA - SHEET NUMBER 84
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DWQ# ftso(0 13 Date
Plan Detail Incomplete
? Please provide a location map for the project.
17 Please show all stream impacts including all fill slopes, dissipaters, and bank stabilization on the site plan.
? Please show all wetland impacts including fill slopes on the site plan.
? Please indicate all buffer impacts on the site plan.
? Please indicate proposed lot layout as overlays on the site plan.
? Please indicate the location of the protected buffers as overlays on the site plan.
? Please locate all isolated or non-isolated wetlands, streams and other waters of the State as overlays on the site plan.
? Please provide cross section details showing the provisions for aquatic life passage,
? Please locate any planned sewer lines on the site plan.
? Please provide the location of any proposed stormwater. management practices as required by GC
? Please provide detail for the stormwater management practices as required by GC
? Please specify the percent of project imperviousness area based on the estimated built-out conditions.
? Please indicate all stormwater outfalls on the site plan.
? Please indicate the diffuse flow provision measures on the site plan.
? Please indicate whether or not the proposed impacts already been conducted.
Avoidance and/or Minimization Not Provided
? The labeled as on the plans does not appear to be necessary. Please eliminate the or provide adshtioidl
information as to why it is necessary for this project.
? This Office believes that the labeled on the plans as can be moved or reconfigured to avoid the impacts to the
. Please revise the plans to avoid the impacts.
? This Office believes that the labeled on the plans as can be moved or reconfigured to minimize the impacts to the
Please revise the plans to minimize the impacts.
? The stormwater discharges at the location on the plans labeled will not provide diffuse flow through the buffer because
Please revise the plans and provide calculations to show that diffuse flow will be achieved through the entire buffer. If it
is not possible to achieve diffuse flow through the entire buffer then it may be necessary to provide stormwater management
practices that remove nutrients before the stormwater can be discharged through the buffer.
Other
? The application fee was insufficient because over 150 feet of stream and/or over 1 acre of wetland impacts were requested. Please
provide $ This additional fee must be received before your application can be reviewed.
? Please complete Section(s) on the application.
? Please provide a signed copy of the application.
? Please provide copies of the application, copies of the site plans and other supporting information.
Mitigation
? of compensatory mitigation is required for this project. Please provide a compensatory mitigation plan. The
of impacts proposed.
plan must conform to the requirements in 15 A NCAC 2H .0500 and must be appropriate to the type
? Please indicate which 404 Permit the USACE would use to authorize this project.
SPAULDING & NORRIS, PA 7181
NC Division of Water QLlality 7/8/2005
6010 - Misc Reintbursables Pennit Applic Fee 200.00
Fidelity-Checking 556-05 - Phase 2 Pennit Application Fee 200.00