20151225 Ver 1_401 Application_20151115

LETTER OF TRANSMITTAL
To: Ms. Karen Higgins, Supervisor
NCDWR - 401 & Buffer Permitting Unit
512 N. Salisbury Street
Raleigh, North Carolina 27604
Re: Saddlebrook
401 Permit Submittal
I am sending you the following item(s):
COPIES DATE NO.
1
5
2
These are transmitted as checked below:
❑ As requested
❑ For approval
® For review and comment
Remarks:
Date:
NOV 2 4 2015
DEN R - 4 A-f�T "LS
401 & BUFFER PERMITTING
November 24, 2015
** HAND DELIVER "
Job No.: CPT -14010
DESCRIPTION
Check - $240
Site Plan
Stormwater Design
❑ For your use
El
El
Copy to: Signed:
George Buchholz, REM, PWS
Environmental Consultant
Raleigh-Durham Charlotte
2905 Meridian Parkway 11301 Carmel Commons Blvd., Suite 111
Durham, North Carolina 27713 Charlotte, North Carolina
[phone] [phone]
Designing Tomorrow's Infrastructure & Communities
McAdamsCo.com

I/
of W ATF9
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.4 January 2009
Pre -Construction Notification (PCN) Form 2 0) 5 1 2 2
A. Applicant Information
1. Processing
1 a Type(s) of approval sought from the Corps: X Section 404 Permit Section 10 Permit
lb Specify Nationwide Permit (NW P) number: 29 or General Permit (GP) number: 3890
1c Has the NWP or GP number been verified by the Corps?
1 d Type(s) of approval sought from the DWQ (check all that apply):
X 401 Water Quality Certification — Regular
401 Water Quality Certification — Express
le Is this notification solely for the record For the record only for
because written approval is not required? DWQ 401 Certification:
X No
X Yes
Non -404 Jurisdictional General Permit
Riparian Buffer Authorization
For the record only for Corps Permit:
X No
Ilf Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank X No
or in -lieu fee program.
1g Is the project located in any of NC's twenty coastal counties. If yes, answer X No
1 h below.
1 h Is the project located within a NC DCM Area of Environmental Concern (AEC)? X No
2. Project Information
Saddlebrook
2a Name of project:
2b
County:
Wake
2c
Nearest municipality/ town:
Apex
2d
Subdivision name:
2e
NCDOT only, T.I.P. or state project
no:
3.
Owner Information
3a
Name(s) on Recorded Deed:
Nancy Walker
3b
Deed Book and Page No.
DB: 011046, PG: 1981
3c
Responsible Party (for LLC if
Nancy Walker
applicable):
3d
Street address:
2708 Tingen Road
3e
City, state, zip:
Apex, NC 27502
3f
Telephone no.:
3g
Fax no.:
3h
Email address:
Page 1 of 10
PCN
Form — Version 1.4 January 2009

4. Applicant Information (if different from owner)
4a Applicant is: Shenandoah Homes
4b Name: Attention: Patrick Adams l
4c Business name
(if applicable):
4d Street address: 2840 Plaza Suite 360
4e City, state, zip:
Raleigh, NC 27612
4f Telephone no.:
1919.422.4681
4g Fax no.:
4h Email address:
1
5. Agent/Consultant Information
(if applicable)
5a Name:
George Buchholz, Environmental Consultant/Project Manager
5b Business name
The John R. McAdams Company
(if applicable):
5c Street address:
2905 Meridian Parkway
5d City, state, zip:
Durham, NC, 27713
5e Telephone no.:
1919-287-0890
5f Fax no.:
919-361-2269
5g Email address:
[e-mail]
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
is Property identification no. (tax PIN or parcel ID):
lb Site coordinates (in decimal degrees): Latitude: 35.725725
1c Property size:
2. Surface Waters
2a Name of nearest body of water to proposed project:
2b Water Quality Classification of nearest receiving water:
2c River basin:
3. Project Description
rake Pin # 0721197520
Longitude: -78.928406
Saddlebrook project
is 70.5 acres
Beaver Creek and Reedy Branch
WS -IV; NSW
(Cape Fear; HUC 030300020609
3a Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application: The existing conditions of the project site are a mix of agricultural, open field, residential, and
forested land uses. There are residential structures, utility easements, wetlands, and pond features present at the
project site.
3b List the total estimated acreage of all existing wetlands on the property: 0.42 acres
3c List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 0 LF
3d Explain the purpose of the proposed project: The purpose of the project is to construct a single-family residential
development to Apex and Wake County, North Carolina, known as Saddlebrook, and will consist of a 114 residential lots
and amenities along with supporting street, parking, utility, stormwater management improvements, and other supporting
infrastructure. As part of the proposed residential development, there is an existing culvert located along Olive Chapel
Road which is proposed to be extended resulting in impacts to Wetland Area "E". In addition, a 10' wide multi -use trail is
proposed along the south side Olive Chapel Road which will also impact Wetland Area "E".
3e Describe the overall project in detail, including the type of equipment to be used: The proposed residential subdivision,
known as Saddlebrook, is located on 70.5 acres of land and will consist of a 114 residential lots and amenities along with
supporting street, parking, utility, stormwater management improvements, and other supporting infrastructure. The entire
site was designed to minimize impacts to aquatic resources while utilizing the remaining land. There is an existing culvert
located along Olive Chapel Road which is proposed to be extended resulting in impacts to Wetland Area "E". In addition, a
10' wide multi -use trail is proposed along the south side Olive Chapel Road which will also impact Wetland Area "E". As a
result, a total of 306 square feet (0.007 acres) of jurisdictional wetland is proposed to be impacted. A network of
stormwater management facilities have been proposed throughout the site to treat and detain storm flows coming from the
site. Typical construction equipment to be utilized will be front end loaders, trackhoes, graders, dump trucks, and bull
dozers.
4. Jurisdictional Determinations
4a Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property
/ project (including all prior phases) in the past?
4b If the Corps made the jurisdictional determination, what
type of determination was made?
4c If yes, who delineated the jurisdictional
areas? Name (if known):
X Yes
Comments:
X Final
Agency/Consultant Company:
Other: Mitchell
Environmental, PA.
4d If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation. USACE
representative James Lastinger has field confirmed the wetland delineation conducted by Mitchell Environmental, PA and
assigned a USACE Action Id number of SAW -2014-01615. Attached is a copy of the Jurisdictional Determination plat prepared
by GC Mapping, PLLC based on the Mitchell Environmental, PA wetland delineation for signature by the USACE.
5. Project History
5a Have permits or certifications been requested or obtained X No
for this project (including all prior phases) in the past?

5b If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a Is this a phased project? X No
6b If yes, explain.
Page 3 of 10
PCN Form — Version 1.4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
X Wetlands Streams — tributaries Buffers Open Waters Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of impact Type of wetland Forested Type of jurisdiction Area of
number Corps (404,10) or impact
Permanent (P) or DWQ (401, other) (acres)
Temporary (T)
Fill Headwater Wetland Yes X Corps 0.007
Wetland E — Inset X DWR
1
2g. Total Wetland Impacts: 0.007
2h. Comments: See Figure 4, Inset 1.
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete
this question for all stream sites impacted.
3a. 3b. 3c. 3d. 3e. 3f. 3J•
Stream impact Type of impact Stream name Perennial (PER) or Type of Average Impact
number intermittent (INT)? jurisdiction stream leno
Permanent (P) or width (linear
Temporary (T) (feet) feet)
3h. Total stream and tributary impacts
3i. Comments:
Page 4 of 10
PCN Form — Version 1.4 January 2009

4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water
of the U.S. then individually list all open water impacts below.
4a. 4b. 4c. 4d. 4e.
Open water Name of waterbody
impact number (if applicable Type of impact Waterbody Area of impact (acres)
Permanent (P) or type
Temporary (T)
01
02
03
04
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Pond ID number Proposed use or Wetland Impacts (acres) Stream Impacts (feet) Upland
purpose of pond (acres)
Flooded Filled Excavated Flooded Filled Excavated
P1
P2
5f. Total:
5gComments:
5hls a dam high hazard permit required? Yes No If yes, permit ID no:
5i Expected pond surface area (acres):
5j Size of pond watershed (acres):
5k Method of construction:
6. Buffer Impacts (for DWO)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer
impacts below. If any impacts require mitiqation, then
you MUST fill out Section D of this form.
6a Project is in which protected basin?
Neuse
Tar -Pamlico Catawba Randleman
Other:
6b. 6c. 6d.
6e. 6f.
6g.
Buffer Impact Reason for impact
Stream name Buffer
Zone 1
Zone 2
number —
mitigation
impact
impact
Permanent (P) or
required?
(square
(square
Temporary (T)
feet)
feet)
131
B2
B3
6h. Total Buffer Impacts:
6i. Comments: BUFFER IMPACTS REVIEWED AND APPROVED BY TOWN OF APEX.
Page 5 of 10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a Specifically describe measures taken to avoid or minimize the proposed impacts in designing project. Proposed impacts to
jurisdictional streams and wetlands have been avoided and minimized to the maximum extent practicable for the proposed
activities. The majority of jurisdictional wetlands and jurisdictional ponds have been avoided. A small portion of Wetland E is
proposed to be impacted as a result of extending an existing culvert located along Olive Chapel Road and the construction of a
10 -foot wide multi -use trail located on the south side of Olive Chapel Road. As a result, there are unavoidable impacts to
Wetland E associated with the extension of culvert and construction of the multi -use trail.
1 b Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques. Proper
sedimentation and erosion control methods will be utilized during construction in accordance with the NC Division of Land
Quality and Town of Apex guidelines. All work will take place during dry conditions and can be facilitated from high, non -
jurisdictional, stable ground. The contractor shall install silt fence, inlet protection, sediment traps, diversion ditches, tree
protection, clearing only as necessary to install devices. All erosion and sediment control measures will be checked for
stability and operation following every runoff producing rainfall, but in no case less than once every week. Any needed repairs
will be made immediately to maintain all measures designed. An erosion control inspections report is required and will be kept
by the owner's representative. Temporary seeding and permanent seeding plans are included to restore impacted areas.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a Does the project require Compensatory Mitigation for X No
impacts to Waters of the U.S. or Waters of the State?
2blf yes, mitigation is required by (check all that apply): DWQ Corps
Mitigation bank
2c If yes, which mitigation option will be used for Payment to in -lieu fee program
this project?
Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a Name of Mitigation Bank:
Type Quantity:
3b Credits Purchased (attach receipt and letter) Quantity:
Type Quantity:
3c Comments:
4. Complete if Making a Payment to In -lieu Fee Program
4a Approval letter from in -lieu fee program is attached.
4b Stream mitigation requested:
linear feet
4c If using stream mitigation, stream temperature:
4d Buffer mitigation requested (DWQ only):
square feet
4e Riparian wetland mitigation requested:
acres
4f Non -riparian wetland mitigation requested:
acres
4g Coastal (tidal) wetland mitigation requested:
acres
4h Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.

Page 6 of 10
PCN Form — Version 1.4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a Will the project result in an impact within a protected riparian buffer that X No
requires buffer mitigation?
6b If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
6c 6d 6e
Zone Reason for impact Total impact Multiplier Required mitigation
(square feet) (square feet)
Zone 1 3 (2 for Catawba)
Zone 2 1.5
6f
6g If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
6h Comments:
Page 7 of 10

E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1 a Does the project include or is it adjacent to protected riparian buffers X Yes
identified within one of the NC Riparian Buffer Protection Rules?
1 b If yes, then is a diffuse flow plan included? If no, explain why. The proposed project
is located within the Jordan Lake watershed and will be subject to the Jordan Lake
Riparian Buffer Rules. Multiple stormwater management facilities with level spreaders are
proposed for use on this site. The proposed stormwater management facilities are
designed in accordance with the N.C. Stormwater Best Management Practices manual
(NCDENR). Proper sedimentation and erosion control methods will be utilized during
construction in accordance with the NC Division of Land Quality and Town of Apex
guidelines. All work will take place during dry conditions and can be facilitated from high, X Yes
non -jurisdictional, stable ground. The contractor shall install silt fence, inlet protection,
sediment traps, diversion ditches, tree protection, clearing only as necessary to install
devices. All erosion and sediment control measures will be checked for stability and
operation following every runoff producing rainfall, but in no case less than once every
week. Any needed repairs will be made immediately to maintain all measures.designed.
An erosion control inspections report is required and will be kept by the owner's
representative. Temporary seeding and permanent seeding plans are included to restore
impacted areas.
2. Stormwater Management Plan
2a What is the overall percent imperviousness of this project?
19.03%
2b Does this project require a Stormwater Manaqement Plan? I X Yes
2c If this project DOES NOT require a Stormwater Management Plan, explain why:

If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan: The proposed
development is located within the Cape Fear River basin with all stormwater runoff draining into Reedy Branch (WS -IV; NSW) and Beaver Creek (WS -IV, NSW),
which are located in the Jordan Lake Watershed. Per the Town of Apex regulations, stormwater management on this site shall meet the stormwater management
performance standards for development set forth in the Town Unified Development Ordinance (UDO). The Stormwater Management Plan contains calculations
detailing the expected stormwater impacts as a result of the proposed development, along with final design calculations for the stormwater management facilities that
will be used to alleviate those impacts and meet the requirements of the Town of Apex Please refer to the appropriate sections of this report for additional information.
Calculation Methodoloev
• Rainfall data for the Apex, NC region is from NOAA Atlas 14 This data describes a depth -duration -frequency (DDF) table describing rainfall depth versus
time for varying return periods in the Apex, NC area These rainfall depths are input into the meteorological model within PondPack for peak flow rate
calculations. Please reference the rainfall data section within this report for additional information
• The on-site topography used in the analysis is from a field survey performed by GC Mapping, PLLC The offsite topography used in the analysis is from
Wake County GIS data.
• Using maps from the NRCS Web Soil Survey, the on- and off-site soils were determined to be from hydrologic soil group (HSG) `B' soils and `D' soils.
Since the method chosen to compute both pre- and post -development peak flow rates and runoff volumes is dependent upon the sod type, care was taken
when selecting the appropriate Soil Conservation Number (SCS CN). For this analysis, the HSGs for the site consisted of `B' and `D'
Within the site boundary, an approximate proportion of each soil group was determined using NRCS Soil Survey Maps Once an approximate proportion
was determined, a composite SCS CN was computed for each cover condition.
• Land cover conditions for the pre -development condition were taken from field survey and supplemented with GIS data. Land cover conditions for the post -
development condition were taken from the proposed development plan Please refer to the pre- and post -development watershed maps for additional
information
• The times of concentration are calculated using the SCS TR -55 Segmental Approach. The Tc flow paths are divided into three segments. overland flow,
concentrated flow, and channel flow. The travel time is then computed for each segment, from which the overall time of concentration is determined by
taking the sum of each segmental time
• Reach lengths are modeled, as appropriate, within PondPack assuming a time translation only, which is based on the computed travel time through each
appropriate, downstream channel segment Please refer to pre- and post -development hydrologic inputs for additional information.
The post -development times of concentration to the proposed stormwater management facility is assumed to be 5 minutes. This provides a conservative
estimate of facility size for design purposes.
• PondPack Version V8i, by Bentley Systems, Inc., was used in determining the pre- & post -development peak flow rates for the I-, 10-, and 100 -year storm
events, as well as routing calculations for the proposed stormwater management facilities.
• For 100- year storm routing calculations. a "worst case condition" was modeled in order to insure the proposed BMPs would safely pass the 100 -year storm
event The assumption used in this scenario is as follows
The starting water surface elevation in each facility, just prior to the 100 -year storm event, is at the secondary spillway elevation. This scenano
could occur as a result of a clogged water quality siphon or a rainfall event that lingers for several days This could also occur as a result of
several rainfall events in a series, before the siphon has an opportunity to draw down the storage pool.
Approximately 1 -foot of freeboard is provided between the peak elevation during the "worst-case" scenario and the top of the dam for the
proposed facilities.
Discussion of Results
Peak Runoff Control Requirements
The proposed project will result in an increase in peak flow rates. To mitigate this impact, the proposed facilities have been designed such that post -development peak
flow rates resulting from on-site development are no greater than pre -development levels in the 1-, 10-, and 100 -year storm events
Pollutant and Nutrient Control Requirements
The site is treated for water quality per 6.1.7 (A) (3) and 6.1.12, using structural water quality ponds and a stormwater wetland to capture runoff from the developed
areas of the site. The ponds are designed to provide 90% TSS removal, with the wetland designed for 85%. The stormwater management facilities meet the design
requirements of the Town of Apex and the North Carolina Division of Water Resources Stormwater Best Management Practices manual
Drainage Basin Analysis
In order to meet the requirements set forth in the Town of Apex's UDO, post -development drainage areas were held to within 80% of their pre -development area
Points of analysis 3 and 4 were combined since they drain to the same common point offsite
Point of Analysis
POA #1
POA #2
POA #3 & #4
Percent of Pre drainage area retained
98.87%
87 18%
110.11%
Conclusion
If the development on this tract is built as proposed within this report, then the requirements set forth in the Town of Apex Unified Development Ordinance will be met
with the proposed stormwater management facilities However, modifications to the proposed development may require that this analysis be revised. Some
modifications that would require this analysis to be revised include
i The proposed site impervious surface exceeds the amount accounted for in this report.
2 The post -development watershed breaks change significantly from those used to prepare this report
The above modifications may result in the assumptions within this report becoming invalid. The computations within this report will need to be revisited if any of the
above conditions become apparent as development of the proposed site moves forward.

2e Who will be responsible for the review of the Stormwater Management Plan?
3. Certified Local Government Stormwater Review
3a In which local government's jurisdiction is this project?
3b Which of the following locally -implemented stormwater management programs
apply (check all that apply):
3c Has the approved Stormwater Management Plan with proof of approval
been attached?
4. DWQ Stormwater Program Review
4a Which of the following state -implemented stormwater management programs
apply (check all that apply):
4b Has the approved Stormwater Management Plan with proof of approval
been attached?
5. DWQ 401 Unit Stormwater Review
5a Does the Stormwater Management Plan meet the appropriate requirements?
5b Have all of the 401 Unit submittal requirements been met?
rCertified Local Govemment
Mown of Apex
X Yes
X Yes
Phase II
X NSW
USMP
X Water Supply Watershed
Other:
Coastal counties
HQW
ORW
X Session Law 2006-246
Other:
Page 8 of 10
PCN Form — Version 1.4 January 2009

F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1a Does the project involve an expenditure of public (federal/state/local) funds or X No
the use of public (federal/state) land?
lb If you answered "yes" to the above, does the project require preparation of
an environmental document pursuant to the requirements of the National or
State (North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c If you answered "yes" to the above, has the document review been finalized by
the State Clearing House? (If so, attach a copy of the NEPA or SEPA final
approval letter.)
2. Violations (DWQ Requirement)
2a Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland X No
Standards, or Riparian Buffer Rules (15A NCAC 2B .0200)?
2bls this an after -the -fact permit application? X No
2clf you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWO Requirement)
3a Will this project (based on past and reasonably anticipated future impacts) result X No
in additional development, which could impact nearby downstream water quality?
3b If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent DWQ policy. If you answered "no," provide a short narrative description. There are appropriate land use
control and stormwater measures in place, and there will be no further impacts to surface waters, that what is currently
proposed. The proposed Saddlebrook project is a single and complete project.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non -discharge or discharge) of wastewater generated
from the proposed project, or available capacity of the subject facility. Waste water will be directed into an existing
Town of Apex maintained sewer line.
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a Will this project occur in or near an area with federally protected species X Yes
or habitat?
5b Have you checked with the USFWS concerning Endangered Species X No
Act impacts?
5c If yes, indicate the USFWS Field Office you have contacted.
5d What data sources did you use to determine whether your site would impact Endangered Species or Designated
Critical Habitat? The USFWS web page (http://www.fws.gov/endangered/) and the Natural Heritage virtual workroom
(http://www.ncnhp.org/web/nhp/nhp-map-viewer) were accessed on November 10, 2015 to determine if the project
would impact Endangered Species or Designated Critical Habitat. Based on this research, the red -cockaded
woodpecker (Picoides borealis), dwarf wedgemussel (Alasmidonta heterodon), Michaux's sumac (Rhus michauxii),
and Northern long-eared bat (Myotis septentrionalis) are federally listed species that occur in Wake County. Based on
field inspections, it is believed that no adverse impacts to threatened and endangered species and their known habitat
will occur due to the construction of the proposed project.
6. Essential Fish Habitat (Corps Requirement)
6a Will this project occur in or near an area designated as essential fish habitat? X No
6b What data sources did you use to determine whether your site would impact Essential Fish Habitat? The interactive map
located at htto:Hocean.floridamarine.orQe coral/ims/viewer.htm was utilized to determine if the project will impact Essential
Fish Habitat and it was determined that it would not.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation X No
status (e.g., National Historic Trust designation or properties significant
in North Carolina history and archaeology)?
What data sources did you use to determine whether your site would impact historic or archeological resources? A review of
the list of properties and districts in the North Carolina in the National Registry of Historic Places
(hhtp://www.hpo.ncdcr.gov/nrlist.htm) was conducted. Based on the review, the proposed.project will not occur in or near
an area that has been designated as having historic or cultural preservation status by the state, federal, or tribal
governments.
8. Flood Zone Designation (Corps Requirement)
8a Will this project occur in a FEMA -designated 100 -year floodplain? I X No
8b If yes, explain how project meets FEMA requirements:
8c What source(s) did you use to make the floodplain determination? The North Carolina Flood Insurance Rate Map
3720072100J (issued May 2, 2006) was reviewed and the proposed project will not impact a 100 -year flood area or floodway.
Applicant/Agent's Printed Name
Applicant/Agent's Signature
(Agent's signature is valid only if an authorization
letter from the applicant is provided.)
Page 10 of 10
11.5 -
Date

J McADAMS
November 23, 2015
Mrs. Karen Higgins
NC Division of Water Resources
401 and Buffer Permitting Unit
512 N. Salisbury Street
Raleigh, North Carolina 27604
Re: Pre -Construction Notification — 401 Water Quality Certification
Saddlebrook
Town of Apex, Wake County, North Carolina
CPT -14010
Dear Mrs. Higgins:
On behalf of Shenandoah Homes, we are applying for a North Carolina
Department of Environment and Natural Resources — Division of Water
Resources (DWR) 401 Water Quality Certification for proposed impacts to
jurisdictional wetlands associated with the project known as Saddlebrook in
which the extension of an existing culvert and construction of a multi -use trail
is proposed. The proposed development currently known as Saddlebrook, is
approximately 70.5 -acres and located west of the intersection of Richardson
Road and Olive Chapel Road in the Town of Apex within Wake County,
North Carolina. The project lies within the Cape Fear River Basin (HUC
030300020609). At this time, we are requesting authorization that the proposed
project qualifies under General Water Quality Certification 3890. The
following attachments are included as part of this permit application:
• Signed Agent Authorizations (Patrick Adams of Shenandoah
McAdamsCo.com Designing Tomorrow's Infrastructure & Communities
Homes, and Nancy Walker current property owner)
•
Fig. 1 - USGS Quad — New Hill
•
Fig. 2 - Wake County Soil Survey (Sheet 64)
•
Fig. 3.0 - Existing Conditions
•
Fig: 3.1 - Existing Conditions w/ aerial
•
Jurisdictional Determination Plat (dated May 12, 2015;
The John R. McAdams
prepared by GC Mapping, PLLC; based on Mitchell
Company, Inc.
Environmental, PA; not singed by USACE as of yet)
•
Pre -Construction Notification
Raleigh / Durham, NC
•
Fig. 4 - Overall Site Plan
2905 Meridian Parkway
•
Inset 1 (Profile View)
Durham, North Carolina 27713
•
Inset 1 (Cross Sections)
[phone]
•
Two courtesy copies of the Stormwater Design Notebook
•
Five copies of the Subdivision and Site Plan Drawings
Charlotte, NC
11301 Carmel Commons Blvd,
Suite 111
Charlotte North Carolina 28226
[phone]
McAdamsCo.com Designing Tomorrow's Infrastructure & Communities

Mrs. Karen Higgins
Saddlebrook
November 23, 2015
Page 2 of 7
PROJECT HISTORY & EXISTING CONDITIONS:
USACE representative James Lastinger has field confirmed the wetland
delineation conducted by Mitchell Environmental, PA and assigned a USACE
Action Id number of SAW -2014-01615. Attached is a copy of the
Jurisdictional Determination plat prepared by GC Mapping, PLLC based on
the Mitchell Environmental, PA wetland delineation for signature by the
USACE.
The proposed development currently known as Saddlebrook, is approximately
70.5 -acres and located west of the intersection of Richardson Road and Olive
Chapel Road in the Town of Apex within Wake County, North Carolina. The
existing conditions of the project site are a mix of agricultural, open field,
residential, and forested land uses. There are residential structures, utility
easements, wetlands, and pond features present at the project site. Based on
the wetland delineation conducted by Mitchell Environmental, PA, there are
0.42 acres of jurisdictional wetlands located within the project site. In
addition, there are 1.23 acres of jurisdictional ponds and 1.59 acres of non -
jurisdictional pond located within the project site. The project site is located
within the Cape Fear River Basin; HUC 030300020609. The project site
drains to Beaver Creek and Reedy Branch. Land uses within the vicinity of
the project site are residential, agriculture, and forested areas.
PROPOSED PROJECT:
The proposed residential subdivision, known as Saddlebrook, is located on
70.5 acres of land and will consist of a 114 residential lots and amenities
along with supporting street, parking, utility, stormwater management
improvements, and other supporting infrastructure. The entire site was
designed to minimize impacts to aquatic resources while utilizing the
remaining land. There is an existing culvert located along Olive Chapel Road
which is proposed to be extended resulting in impacts to Wetland Area "E".
In addition, a 10' wide multi -use trail is proposed along the south side Olive
Chapel Road which will also impact Wetland Area "E". As a result, a total of
306 square feet (0.007 acres) of jurisdictional wetland is proposed to be
impacted. A network of stormwater management facilities have been
proposed throughout the site to treat and detain storm flows coming from the
site. Additional impacts to jurisdictional waters located at the project site are
not proposed.
CPT -14010

Mrs. Karen Higgins
Saddlebrook
November 23, 2015
Page 3 of 7
Impact Table
Wetland
Proposed Impacts
Wetland E
0.007 acres (306 sq ft)
Total Impacts
0.007 acres (306 sq ft)
Stormwater Management
The proposed project is located within the Jordan Lake watershed and will be
subject to the Jordan Lake Riparian Buffer Rules. Multiple stormwater
management facilities with level spreaders are proposed for use on this site.
The proposed stormwater management facilities are designed in accordance
with the N.C. Stormwater Best Management Practices manual (NCDENR).
Proper sedimentation and erosion control methods will be utilized during
construction in accordance with the NC Division of Land Quality and Town
of Apex guidelines. All work will take place during dry conditions and can be
facilitated from high, non jurisdictional, stable ground.
The proposed development is located within the Cape Fear River basin with
all stormwater runoff draining into Reedy Branch (WS -IV; NSW) and Beaver
Creek (WS -IV; NSW), which are located in the Jordan Lake Watershed. Per
the Town of Apex regulations, stormwater management on this site shall meet
the stormwater management performance standards for development set forth
in the Town Unified Development Ordinance (UDO). The Stormwater
Management Plan contains calculations detailing � the expected stormwater
impacts as a result of the proposed development, along with final design
calculations for the stormwater management facilities that will be used to
alleviate those impacts and meet the requirements of the Town of Apex.
Please refer to the appropriate sections of this report for additional
information.
Calculation Methodolo2v
• Rainfall data for the Apex, NC region is from NOAA Atlas 14. This
data describes a depth -duration -frequency (DDF) table describing
rainfall depth versus time for varying return periods in the Apex, NC
area. These rainfall depths are input into the meteorological model
within PondPack for peak flow rate calculations. Please reference the
rainfall data section within this report for additional information.
• The on-site topography used in the analysis is from a field survey
performed by GC Mapping, PLLC. The offsite topography used in the
analysis is from Wake County GIS data.
CPT -14010

Mrs. Karen Higgins
Saddlebrook
November 23, 2015
Page 4 of 7
Using maps from the NRCS Web Soil Survey, the on- and off-site
soils were determined to be from hydrologic soil group (HSG) `B'
soils and `D' soils. Since the method chosen to compute both pre- and
post -development peak flow rates and runoff volumes is dependent
upon the soil type, care was taken when selecting the appropriate Soil
Conservation Number (SCS CN). For this analysis, the HSGs for the
site consisted of `B' and `D'.
Within the site boundary, an approximate proportion of each soil
group was determined using NRCS Soil Survey Maps. Once an
approximate proportion was determined, a composite SCS CN was
computed for each cover condition.
Land cover conditions for the pre -development condition were taken
from field survey and supplemented with GIS data. Land cover
conditions for the post -development condition were taken from the
proposed development plan. Please refer to the pre- and post -
development watershed maps for additional information.
The times of concentration are calculated using the SCS TR -55
Segmental Approach. The Tc flow paths are divided into three
segments: overland flow, concentrated flow, and channel flow. The
travel time is then computed for each segment, from which the overall
time of concentration is determined by taking the sum of each
segmental time.
Reach lengths are modeled, as appropriate, within PondPack assuming
a time translation only, which is based on the computed travel time
through each appropriate, downstream channel segment. Please refer
to pre- and post -development hydrologic inputs for additional
information.
The post -development times of concentration to the proposed
stormwater management facility is assumed to be 5 minutes. This
provides a conservative estimate of facility size for design purposes.
PondPack Version V8i, by Bentley Systems, Inc., was used in
determining the pre- & post -development peak flow rates for the 1-,
10-, and 100 -year storm events, as well as routing calculations for the
proposed stormwater management facilities.
For 100- year storm routing calculations, a "worst case condition" was
modeled in order to insure the proposed BMPs would safely pass the
100 -year storm event. The assumption used in this scenario is as
follows:
CPT -14010

Mrs. Karen Higgins
S addlebrook
November 23, 2015
Page 5 of 7
o The starting water surface elevation in each facility, just prior
to the 100 -year storm event, is at the secondary spillway
elevation. This scenario could occur as a result of a clogged
water quality siphon or a rainfall event that lingers for several
days. This could also occur as a result of several rainfall events
in a series, before the siphon has an opportunity to draw down
the storage pool.
o Approximately 1 -foot of freeboard is provided between the
peak elevation during the "worst-case" scenario and the top of
the dam for the proposed facilities.
Discussion of Results
Peak Runoff Control Requirements
The proposed project will result in an increase in peak flow rates. To mitigate
this impact, the proposed facilities have been designed such that post -
development peak flow rates resulting from on-site development are no
greater than pre -development levels in the 1-, 10-, and 100 -year storm events.
Pollutant and Nutrient Control Requirements
The site is treated for water quality per 6.1.7 (A) (3) and 6.1.12, using
structural water quality ponds and a stormwater wetland to capture runoff
from the developed areas of the site. The ponds are designed to provide 90%
TSS removal, with the wetland designed for 85%. The stormwater
management facilities meet the design requirements of the Town of Apex and
the North Carolina Division of Water Resources Stormwater Best
Management Practices manual.
Drainage Basin Analvsis
In order to meet the requirements set forth in the Town of Apex's UDO, post -
development drainage areas were held to within 80% of their pre -development
area. Points of analysis 3 and 4 were combined since they drain to the same
common point offsite.
Point of Analysis Percent of Pre drainage area retained
POA #1 98.87%
POA #2 87.18%
POA #3 & #4 110.11%
CPT -14010

Mrs. Karen Higgins
Saddlebrook
November 23, 2015
Page 6 of 7
Conclusion
If the development on this tract is built as proposed within this report, then the
requirements set forth in the Town of Apex Unified Development Ordinance
will be met with the proposed stormwater management facilities. However,
modifications to the proposed development may require that this analysis be
revised. Some modifications that would require this analysis to be revised
include:
1. The proposed site impervious surface exceeds the amount accounted
for in this report.
2. The post -development watershed breaks change significantly from
those used to prepare this report.
The above modifications may result in the assumptions within this report
becoming invalid. The computations within this report will need to be
revisited if any of the above conditions become apparent as development of
the proposed site moves forward.
AVOIDANCE & MINIMIZATION:
Proposed impacts to jurisdictional streams and wetlands have been avoided
and minimized to the maximum extent practicable for the proposed activities.
The majority of jurisdictional wetlands and jurisdictional ponds have been
avoided. A small portion of Wetland E is proposed to be impacted as a result
of extending an existing culvert located along Olive Chapel Road and the
construction of a 10 -foot wide multi -use trail located on the south side of
Olive Chapel Road. As a result, there are unavoidable impacts to Wetland E
associated with the extension of culvert and construction of the multi -use trail.
Proper sedimentation and erosion control methods will be utilized during
construction in accordance with the NC Division of Land Quality and Town
of Apex guidelines.
MITIGATION:
The Saddlebrook project proposes a total of 306 square feet (0.007 acres) of
jurisdictional wetland impact. At this time, the applicant does not propose
compensatory mitigation for impacts to Waters of the U.S.
CPT -14010

Mrs. Karen Higgins
Saddlebrook
November 23, 2015
Page 7 of 7
SUMMARY:
The proposed residential subdivision, known as Saddlebrook, is located on
70.5 acres of land and will consist of a 114 residential lots and amenities
along with supporting street, parking, utility, stormwater management
improvements, and other supporting infrastructure. The entire site was
designed to minimize impacts to aquatic resources while utilizing the
remaining land. There is an existing culvert located along Olive Chapel Road
which is proposed to be extended resulting in impacts to Wetland Area "E".
In addition, a 10' wide multi -use trail is proposed along the south side Olive
Chapel Road which will also impact Wetland Area "E". As a result, a total of
306 square feet (0.007 acres) of jurisdictional wetland is proposed to be
impacted.
The proposed project is a single and complete project and confined within the
property boundary. Appropriate land use control measures will be in place for
areas which will require them. Additional impacts to streams and wetlands
located within the project site are not proposed. At this time, the applicant
does not propose compensatory mitigation for impacts to Waters of the U.S.
At this time, we are requesting authorization that the proposed project qualifies
under General Water Quality Certification 3890. Consideration of this project
is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at [phone].
Sincerely,
The John R. McAdams Company, Inc.
George Buchholz, REM, PW
Environmental Consultan roject Manager
Attachments: Listed above
CPT -14010

WADAMS
AGENT AUTHORIZATION FORM
All Blanks To Be Filled In
Name: Patrick Adams
Address: 2840 Plaza Place, Suite 200, Raleigh, NC 27612
Phone: [phone]
Project Name/Description: Saddlebrook
Project Number: CPT -14010 1 Project Manager: I George Buchholz
Date: 11/19/2015
U.S. Army Corps of Engineers
Attn: David Schaeffer
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
I hereby designate and authorize The John R. McAdams Company, Inc. to act in my behalf as
my agent in the processing of permit applications, to fiirnish upon request supplemental
information in support of applications, etc. from this day forward.
I, the undersigned, a drily authorized owner of record of the property/properties identified herein,
do authorize representatives of the Wilmington District, U.S. Army Corps of Engineers (Corps)
to enter upon the property herein described for the purpose of conducting on-site investigation
and issuing a determination associated with Water of the U.S. subject to Federal jurisdiction
under Section 404 of the Clean Water Act and/or Section 10 of the Rivers and Harbors Act of
1899.
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE: This authorization, for liability, and professional courtesy reasons, is valid only
for government officials to enter the property when accompanied by The John R.
McAdams Company, Inc. staff.
Print iguatureJ"
Raleigh-Durham Charlotte
2905 Meridian Parkway 11301 Carmel Commons Blvd., Suite 111
Durham, North Carolina 27713 Charlotte, North Carolina
[phone] [phone]
Designing Tomorrow's Infrastructure & Communities
McAdamsCo.com

AGENT AUTHORIZATION FORM
All Blanks To Be Filled In
Name: Patrick Adams
Address: 2840 Plaza Place, Suite 200, Raleigh, NC 27612
Phone: [phone]
Project Name/Description: Saddlebrook
Project Number: CPT -14010 I Project Manager: I George Buchholz
Date: 11/19/2015
U.S.. Army Corps of Engineers
Attn: David Schaeffer
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
Re: Wetlands Related Consulting and Permitting
To Whom It May Concern:
I hereby designate and authorize The John R. McAdams Company, Inc. to act in 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.
I, the undersigned, a duly authorized owner of record of the property/properties identified herein,
do authorize representatives of the Wilmington District, U.S. Army Corps of Engineers (Corps)
to enter upon the property herein described for the purpose of conducting on-site investigation
and issuing a determination associated with Water of the U.S. subject to Federal jurisdiction
under Section 404 of the Clean Water Act and/or Section 10 of the Rivers and Harbors Act of
1899.
This notification supersedes any previous correspondence concerning the agent for this project.
NOTICE: This authorization, for liability and professional courtesy reasons, is valid only
for government officials to enter the property when accompanied by The John R.
McAdams Company, Inc. staff.
Print Signature
Raleigh-Durham Charlotte
2905 Meridian Parkway 11301 Carmel Commons Blvd., Suite 111
Durham, North Carolina 27713 Charlotte, North Carolina
[phone] [phone]
Designing Tomorrow's Infrastructure & Communities
McAdamsCo.com

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SADDLEBKOUK
PRE -CONSTRUCTION
NOTIFIC.4
FIGURE
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-14010
MAP

LAT: 35.725725 N, LONG: -78.929-466w
N SADDLEBROOK
cl
PRE -CONSTRUCTION NOTIFICATION FIGURE 2. SOIL SURVEY EXHIBIT
0 250 500 1,000 PROJECT #: CPT -14010
Feet
I inch = 500 feet APEX, NORTH CAROLINA
,l
M cAD,AMS

LEGEND
-----------
-� _-------- PROPERTY BOUNDARY
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NOTES
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N SADDLEBROOK
PRE -CONSTRUCTION NOTIFICATION
FIGURE 3.1. AERIAL EXHIBIT
0 175 350 goo Feet PROJECT M CPT -14010
inch =350 feet APEX, NORTH CAROLINA
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SUBJECT PROPERTY
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PRE -CONSTRUCTION NOTIFICATION
FIGURE 3.1. AERIAL EXHIBIT
0 175 350 goo Feet PROJECT M CPT -14010
inch =350 feet APEX, NORTH CAROLINA
'J
MCADAMS�

SURVEY CERTIFICATE
L OUT W COGIE A8 A PRDFE8901UL LAD SINTESa1 N THE
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THAT A RAL TITLE SEARCH WOULD OISObSE.
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a ALL DOTTANCi9 ARE HOWZORAL OROUW DIST
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LOCATED N ZONE X PER PAN PANEL
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P TOTAL 1.25 AGES
1E113 PROPERTY IS ZONED R --WW
TTI CERC EW THAT TIo DOPY OF THE PIAT ACCUIUk LT O
THE BOUNDARY Or IE JURISDICTION OF SECTION 404 OF M EEA!
WATER AOT AS DETER IlED BY THE: UNDERSIGNED ON THIS DAR
UN DIS TIDE IS A CHANGE N THE LAW OR OUR PUWIl61W
RE0.lA1NH; M DETERMINATION O SECTION' N ANaOCEN RUT
BE RELIED LPN FOR A PERIOD NOT TO EXCRED EM EE1 YW FROM
TITS DATE THE IROE89EtD OO `UrlED THE,TION
VIRIDAE THE APPROPWIATE REGIONAL VJ44AM IR TO THE 1987 U.S.
ARNY CORPS OF ENaWlR!, 1111ATD1, OEURATON MANUAL,
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225 BRIARCLIFF ROAD
ROCKY MOUNT, NC 27804
LAWRENCE HEIRS PROPERTIES
GUY COOKE, PLS L-4596
OLIVE CHAPEL ROAD
FIRM p P-1311
WETLAND MAP
SHEET 1 OF 2
APEX, NO 27502
919-901-5641
V COO
— I5'
WHITE OAK TOWNSHIP
WAKE COUNTY
1200
E IDATE0-15

RESTRUCTURES ��
1112 `
IB 11128 PGS 2395,77
\`tiF � �tiF RW
MICHAEL H. LAWRENCE
2024 RICHARDSON ROAD
APEX, NC ,
DB 10296 PG 2416 ,
PIN 721187619 \� ,
9.9 ACRES
S
WETLANDS AREA
g 'D' 0.10 ACRES
1
RI I 10 L 1�
SND 0.26 ,
E
;F
ALL INSETS ARE 50 SCALE
I
WETLANDS
AREA 'A'
0.07 ACRES (� VAIL
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AREA 'B'
�Y 0.07 ACRES
e6 (208.81')
IPF_
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ID13 14464 PG 787
II
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3 �
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USACE MONUMENT
1967 #5296 BROKEN
LAWRENCE HEIRS PROPERTIES
MAP OLIVE CHAPEL ROAD
WETLAND
SHEET 2 M 2 APEX, NC 27502
WHITE OAK TOWNSHIP
WAKE COUNTY
W00TY MAP
MAP/DEED REFERENCES
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0
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GC MAPPING, PLLC
225 BRIARCLIFF ROAD
ROCKY MOUNT, NC 27804
GUY V COOKE, PLS L-4596
FIRM # P-1311
919-901-5641
SCALE 150 1
DATE 5-10-15

I —--_—_-----
LEGEND
F---- --------------
- - - - - - - - - - 7
------_-----------i PROPERTY BOUNDARY
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o
(705 ACRES)
JURISDICTIONAL WETLANDS
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0 13 ACRES
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JURISDICTIONAL POND
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JURISDICTION
/ 1 9 11I I I \ � \\J \\\1 NON -JURISDICTIONAL POND Q
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067 ACRES NOTES Q
1) PROPERTY LIES WITHIN THE CAPE FEAR RIVER
BASIN, HUC 030300020609
2) WETLAND DELINEATION BY MITCHELL
<� 3 � -\ Av\vA ENVIRONMENTAL, PA
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I wJ t S5 ' / _"- J ®\ / \ 6 �\ i \ \\, 4) USACE CONFIRMED WETLAND DELINEATION
SII } I �% ,4 1 I� / . i / , �7 / as - '/ A A \ \
/ \\ `\ USACE NUMBER SAW -2014-01615
Iv � /'PROPOSED IMPACTS Z
SECTION 404/401 WETLAND IMPACTS
306 SO FT (0 007 AC)
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10 06 ACRES
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2905 Mertdlan Parkway
Durham, North Carolina 27713
License No C-0293
MCADAMS
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PROJECT NO CPT -14010
SADDLEBROOK
FILENAME
CPT- 14010-CulvertCross
C SCALE , , PCN PROFILE
DATE 11-24-15 APEX, NORTH CAROLINA
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COMPANY, INC
2905Meridian Parkway
Dlrzham, North Camltrla 27718
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JURISDICTIONAL WETLANDS
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•: GRAPHIC SCALE
...�, : PROPOSED WETLAND IMPACTS 30 0 15 30 60
•, 306 SO FT (0 007 AC) I I I I
I inch = 30 ft
X \Pro lects\CPT\CPT-14010\Storm Wetlands\Permit\current drew ings\CPT14010—OAGi dwq, 11/23/2015 4 02 54 PM, Buchholz, George
L 10 re°,F"T "° CPT-14010
SADDLEBIRO'NOK _
1HE JOHN R McADAMS
> 2905 Meridian
n attFX..1F CPT140100AG1 DWG COMPANY.
0 SC 11 F PCN Durham, North Carolina 27713
a 1 = 30 Ucense No C-0293
DATE INSET 11!300) 733-5646 • McAdamsCo com
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11-19-15 APEX, NORTH CAROLINA MCADAMS