20170640 Ver 1_401 Application_20170524

LMG PAID
LAND MANAGEMENT GROUP INC. 8 ---
Environmental Consultants 2.O 1 7 0 6 4 0
May 16, 2017
TO: Mr. Chad Coburn � %7
NC DEQ Division of Water Resources L5
127 Cardinal Drive Extension p
AY 2 4 20]7, . I
Wilmington, NC 28405
RE: Airlie at Wrightsville Sound; New Hanover County, NC
401 WQC Application
Dear Chad:
Enclosed is a 401 WQC Application for your review. It is submitted on behalf of SSG -1 LLC for the
construction of a low -impact, single-family residential development named Airlie at Wrightsville
Sound, which is located at 315 Airlie Road in Wilmington, NC. The applicant proposes impacts to
0.336 acre of wetlands for lot development and to provide access throughout the property.
Wetland impacts will also improve water quality to Airlie Lake and reduce potential flooding along
Airlie Road. The applicant proposes to mitigate for the wetland impacts by purchasing credits from
the Northeast Cape Fear Umbrella Mitigation Bank.
Enclosed are the PCN form, site maps, and site plan. The DWR application fee has been submitted
to your Raleigh office. Please let me know if you have any questions or need additional
information in order to issue the 401 WQC. Thank you for your assistance with this project.
Sinc rely,
Ilim Williams
Environmental Scientist
Encl.
cc: Mr. David Novotny, State Street Companies
Mr. Richard Collier & Nick Lauretta, McKim and Creed
Ms. Jennifer Burdette, NC DWR
www.lmgroup.net • [e-mail] • Phone: [phone] • Fax: [phone]
3805 Wrightsville Avenue, Suite 15 • Wilmington, NC 28403

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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
Page 1 of 11
PCN Form — Version 1.3 December 10, 2008 Version
Pre -Construction Notification (PCN) Form
A.
Applicant Information
1.
Processing
1 a.
Type(s) of approval sought from the
Corps:
® Section 404 Permit ❑Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 29 & 18 or General Permit (GP) number:
1 c.
Has the NWP or GP number been verified by the Corps?
® Yes
❑ No
1 d.
Type(s) of approval sought from the DWQ (check all that apply):
® 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
1 e.
Is this notification solely for the record
because written approval is not required?
For the record only for DWQ 401
Certification:
❑ Yes ® No
For the record only for Corps Permit:
❑ Yes ® No
1 f.
Is payment into a mitigation bank or in -lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in -lieu
fee program.
® Yes
❑ No
1 g.
Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
® Yes
❑ No
1 h.
Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes
® No
2.
Project Information
2a.
Name of project:
Airlie at Wrightsville Sound
2b. County:
New Hanover County
2c.
Nearest municipality / town:
Wilmington
2d. Subdivision name:
Airlie at Wrightsville Sound
2e.
NCDOT only, T.I.P. or state
project no:
N/A
3.
Owner Information
3a.
Name(s) on Recorded Deed:
SSG -1, LLC
3b.
Deed Book and Page No.
5760 2968
3c.
Responsible Party (for LLC if
applicable):
Jeffrey W. Kentner
3d.
Street address:
P.O. Box 12477
3e.
City, state, zip:
Charlotte, NC 28220
3f.
Telephone no.:
704-372-3703
3g.
Fax no.:
704-973-9804
3h.
Email address:
David Novotny: [e-mail]
Page 1 of 11
PCN Form — Version 1.3 December 10, 2008 Version

4.
Applicant Information (if different from owner) N/A
4a. Applicant is:
❑ Agent ❑ Other, specify:
4b.
Name:
4c.
Business name
(if applicable):
4d.
Street address:
4e. City, state, zip:
4f.
Telephone no.:
4g.
Fax no.:
4h.
Email address:
5.
Agent/Consultant Information (if applicable)
5a.
Name:
Kim Williams
5b.
Business name
(if applicable):
Land Management Group, Inc.
5c.
Street address:
3805 Wrightsville Avenue, Suite 15
5d. City, state, zip:
Wilmington, NC 28403
5e.
Telephone no.:
[phone]
5f.
Fax no.:
[phone]
5g.
Email address:
[e-mail]
Page 2 of 11

B. Project Information and Prior Project History
1. Properly Identification
1a. Property identification no. (tax PIN or parcel ID):
R05700-006-002-000
1 b. Site coordinates (in decimal degrees):
Latitude: 34.218643 N, Longitude: -77.828218 W
(DD.DDDDDD) (-DD.DDDDDD)
1 c. Property size:
11.4 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to
Bradley Creek
proposed project:
2b. Water Quality Classification of nearest receiving water:
SC
2c. River basin:
White Oak
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
The tract is currently undeveloped. It is partially forested and partially cleared. Adjacent land use is mostly developed as
residential. Adjacent undeveloped land is a mix of forested and unforested. An outparcel in the southwestern part of the
site is an existing pump station. Airiie Gardens is located south of the site (across from Airiie Rd) and a vacant shopping
center is north of the site.
3b. List the total estimated acreage of all existing wetlands on the property:
0.61 acre
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
— 165 LF of stream
3d. Explain the purpose of the proposed project:
The purpose of the proposed project is to construct a low -impact, single-family residential subdivision within the tract. Wetland
impacts are needed for lot development and to provide access to uplands throughout site. Impacts will also help to improve
water quality at Airlie Lake and alleviate potential flooding along Airlie Road (see attached narrative prepared by the project
engineer, McKim and Creed).
3e. Describe the overall project in detail, including the type of equipment to be used:
This project includes the construction of a single-family residential subdivision with 55 lots, access ways (22'— 61' rights-of-
way), and utilities. Lot sizes will range from 5,000 sf to 9,450 sf. Please see the attached narrative for information related to
stormwater techniques to be utilized at the site. Sewer and water lines will be located within the corridor. The roadways will be
cleared of vegetation and fill material will be brought to the site to level the area of disturbance. To reduce sedimentation due
to untreated offsite runoff and improve water quality in Airlie Lake, the project engineer, McKim and Creed, is proposing to
remove an existing 36" RCP culvert under Airlie Road that currently connects some of the on-site wetlands to Aidie Lake and
redirecting stormwater westward to a 36" RCP culvert that discharges through an engineered outfall system which is
composed of plunge pools and rain gardens and was recently installed for the Airiie Forest subdivision. Debris currently
located within the wetlands will be removed and the areas will be filled. Utilities will be installed and the homes will then be
constructed. Track hoe, loader, dump truck, bob cat, and other standard construction equipment will be used.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
® Yes ❑ No ❑ Unknown
project (including all prior phases) in the past?
Comments:
4b. If the Corps made the jurisdictional determination, what type
El Preliminary Final
®
of determination was made?
4c. If yes, who delineated the jurisdictional areas?
Agency/Consultant Company:
Name (if known): Corey Novak
Land Management Group, Inc.
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
Kyle Dahl of the USACE verbally approved the wetland line at a site meeting with Rob Moul on 5/2/17.
Page 3 of 11
PCN Form — Version 1.3 December 10, 2008 Version

B. Project Information and Prior Project History
S. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑ Yes ® No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project?
❑ Yes ® No
6b. If yes, explain_
Page 4 of 11

C. Proposed Impacts Inventory
1. Impacts Summary
la. Which sections were completed below for your project (check all that apply):
® Wetlands ❑ Streams - tributaries ❑ Buffers
❑ Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a.
2b.
2c.
2d.
2e.
2f.
Wetland impact
Type of jurisdiction
number —
Type of impact
Type of wetland
Forested
(Corps - 404, 10
Area of impact
Permanent (P) or
(if known)
DWQ — non -404, other)
(acres)
Temporary
W1 ®P ❑ T
Road/Lot Fill
Non -riparian
® Yes
❑ No
® Corps
® DWQ
0.212
W2 ®P ❑ T
Road/Lot Fill
Non -riparian
® Yes
❑ No
® Corps
® DWQ
0.124
W3 ❑ P ❑ T
❑ Yes
❑ No
❑ Corps
❑ DWQ
❑ Yes
❑ Corps
W4 ❑ P ❑ T
❑ No
❑ DWQ
W5 ❑ P ❑ T
❑ Yes
❑ No
❑ Corps
❑ DWQ
2g. Total wetland impacts
0.336
2h. Comments:
3. Stream Impacts N/A
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.
3g.
Stream impact
Type of impact
Stream name
Perennial
Type of jurisdiction
Average
Impact
number -
(PER) or
(Corps - 404, 10
stream
length
Permanent (P) or
intermittent
DWQ — non -404,
width
(linear
Temporary (T)
(INT)?
other)
(feet)
feet
❑ PER
❑ Corps
S1 ❑ P ❑ T
❑ INT
❑ DWQ
S2 ❑ P ❑ T
❑ PER
❑ INT
❑ Corps
❑ DWQ
S3 ❑ P ❑ T
❑ PER
❑ INT
❑ Corps
❑ DWQ
S4 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
❑ DWQ
S5 ❑ P ❑ T
❑ PER
❑ Corps
❑ INT
I ❑ DWQ
3h. Total stream and tributary impacts
3i. Comments:
Page 5 of 11
PCN Form — Version 1.3 December 10, 2008 Version

4. Open Water Impacts N/A
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 type Area of impact (acres)
Permanent (P) or
Temporary
01 []PEI T
02 ❑P❑T
03 ❑P❑T
04 ❑P❑T
0. Total open water impacts
4g. Comments:
5. Pond or Lake Construction N/A
If pond or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d. 5e.
Wetland Impacts (acres) Stream Impacts (feet) Upland
Pond ID Proposed use or purpose (acres)
number of pond
Flooded I Filled I Excavated Flooded I Filled I Excavated Flooded
P1
P2
5f. Total
5g. Comments:
5h. Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ) N/A
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 mitigation, then you MUST fill out Section D of this form.
6a.
Project is in which protected basin?
6b. 6c. 6d.
Buffer impact
number — Reason
Permanent (P) or for
Temporary T impact
61 ❑P❑T
B2 ❑P❑T
B3 ❑P❑T
6i. Comments:
❑ Neuse ❑ Tar -Pamlico ❑ Other:
❑ Catawba ❑ Randleman
6e. I 6f. I 6g.
Buffer
Stream name mitigation
required?
❑ Yes
❑ No
❑ Yes
❑ No
❑ Yes
❑ No
6h. Total buffer impacts
Page 6 of 11
Zone 1 impactI Zone 2 impact
(square feet) (square feet)

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1 a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The proposed project is a low-impact development with small lot sizes. The proposed site plan allows the required number of
lots to make this project economically feasible for the developer while still designing a low impact project. The applicant
originally planned to impact 0.442 acre of wetlands, including part of the high-quality wetland/stream system in the
southwestern part of the site (see Figure 5). Because this wetland is considered to be high quality and is adjacent to a
stream, the developer decided to revise the plan to avoid the wetland pocket completely (see Figure 6). This resulted in losing
one lot, which is significant in this high-demand community. The wetland pockets in the southeastern part of the site to be
impacted contain a great deal of trash/concrete and are considered to be low-quality. Pollution from these wetlands currently
flows through a culvert and into Airlie Lake, causing water quality problems for the lake. Filling these wetlands and redirecting
runoff into a stormwater management system will improve water quality. Additionally, there is a steep topographical break to
these wetlands. Leaving them in place could pose a safety risk to adjacent lot owners. Please see the attached narrative
prepared by McKim and Creed engineers that describes existing water quality impairments and proposed improvements.
Finally, the applicant proposes buying 0.3 acre of non-riparian wetland credits from the Northeast Cape Fear Umbrella
Mitigation Bank.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Silt fencing will be used during construction to reduce sediment from eroding into jurisdictional 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
® Yes ❑ No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply):
❑ DWQ ® Corps
® Mitigation bank
2c. If yes, which mitigation option will be used for this
El Payment to in-lieu fee program
project?
❑ Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank: Northeast Cape Fear Umbrella Mitigation Bank
3b. Credits Purchased (attach receipt and letter)
Type: Non-
Riparian
Quantity: 0.3 ac
3c. Comments:
4. Complete if Making a Payment to In-lieu Fee Program N/A
4a. Approval letter from in-lieu fee program is attached.
❑ Yes
4b. Stream mitigation requested:
linear feet
4c. If using stream mitigation, stream temperature:
❑ warm ❑ cool ❑cold
4d. Buffer mitigation requested (DWQ only):
square feet
4e. Riparian wetland mitigation requested:
acres
4f. Non-riparian wetland mitigation requested:
acres
4g. Coastal (tidal) wetland mitigation requested:
acres
4h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan N/A
Page 7 of 11
PCN Form — Version 1.3 December 10, 2008 Version

5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ N/A
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation?
❑ Yes ® No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
Zone
6c.
Reason for impact
6d.
Total impact
(square feet)
Multiplier
6e.
Required mitigation
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1.5
6f. Total buffer mitigation required:
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 8 of 11

E.
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1.
Diffuse Flow Plan N/A
1 a.
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes ® No
within one of the NC Riparian Buffer Protection Rules?
1 b.
If yes, then is a diffuse flow plan included? If no, explain why.
❑ Yes ❑ No
Comments:
2.
Stormwater Management Plan
2a.
What is the overall percent imperviousness of this project?
63%
2b.
Does this project require a Stormwater Management Plan?
® Yes ❑ No
2c.
If this project DOES NOT require a Stormwater Management Plan, explain why:
2d.
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
The project engineer is currently working to obtain a stormwater permit. Please see the attached narrative prepared by McKim
and Creed engineers for information related to stormwater techniques to be utilized at the site.
® Certified Local Government
2e.
Who will be responsible for the review of the Stormwater Management Plan?
❑ DWQ Stormwater Program
❑ DWQ 401 Unit
3.
Certified Local Government Stormwater Review
3a.
In which local government's jurisdiction is this project?
City of Wilmington
® Phase II
❑ NSW
3b.
Which of the following locally -implemented stormwater management programs
❑ USMP
apply (check all that apply):
❑ Water Supply Watershed
❑ Other:
3c.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ® No
attached?
4.
DWQ Stormwater Program Review N/A
❑ Coastal counties
❑ HQW
4a.
Which of the following state -implemented stormwater management programs apply
❑ ORW
(check all that apply):
❑ Session Law 2006-246
❑ Other:
4b.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
5.
DWQ 401 Unit Stormwater Review N/A
5a.
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b.
Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 9 of 11
PCN Form — Version 1.3 December 10, 2008 Version

F.
Supplementary Information
1.
Environmental Documentation (DWQ Requirement)
1 a.
Does the project involve an expenditure of public (federal/state/local) funds or the
❑ Yes
® No
use of public (federal/state) land?
1 b.
If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State
❑ Yes
❑ No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1 c.
If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
El Yes
El No
letter.)
Comments: N/A
2.
Violations (DWQ Requirement)
2a.
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
❑ Yes
® No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b.
Is this an after -the -fact permit application?
❑ Yes
® No
2c.
If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3.
Cumulative Impacts (DWQ Requirement)
3a.
Will this project (based on past and reasonably anticipated future impacts) result in
❑ Yes
® No
additional development, which could impact nearby downstream water quality?
3b.
If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
This project will not provide access or utilities to adjacent properties.
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.
Wastewater generated by this project will tie into the local municipality.
Page 10 of 11
PCN Form — Version 1.3 December 10, 2008 Version

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
® Yes ❑ No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act
❑ Yes ® No
impacts?
❑ Raleigh
5c. If yes, indicate the USFWS Field Office you have contacted.
❑ Asheville
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
The NC Natural Heritage Program website was used to determine the presence of federally -listed species. No federally listed
species are known to occur within the site. Several rare species including the Atlantic sturgeon, American alligator, and the
West Indian manatee, are known to occur within one mile of the site, likely within Bradley Creek, which is located
approximately 0.5 mile south of the site. Additionally, the northern long-eared bat has been identified within New Hanover
County. While some vegetation that could provide appropriate roosting or wintering habitat for the bat will be removed for site
development, the applicant has minimized the number of trees to be removed as much as possible. Roadways and sidewalks
have been placed to avoid regulated and significant trees to the maximum extent practicable. Existing vegetation within the
property streetyard and interior landscape courtyards has been substantially preserved. No blasting or other percussive
activities will occur during site development. Furthermore, there are no existing bridges that could provide appropriate habitat
for the bat. No impacts to federally -listed species are anticipated to occur from this project.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
The NOAA Fisheries Essential Fish Habitat Mapper GIS program was used to determine the presence of Essential Fish
Habitat. No EFH is known to occur within or adjacent to the site.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation
❑ Yes ® No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
The NC State Historic Preservation Office HPOWEB GIS mapping resource was used to determine the presence of
cultural or historic resources. No cultural or historical resources were noted within or adjacent to the site.
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA -designated 100 -year floodplain?
❑ Yes ® No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination? The NC Floodplain Mapping Information System
website was used to determine the boundaries of the 100 -year floodpl 1in.
Kim Williams
Ll- �
5/16/2017
Applicant/Agent's Signature
Applicant/Agent's Printed Name
(Agent's signature is valid only if an authorization letter from the applicant
Date
is provided.)
Page 11 of 11

LNI G
I ANb M/.Nh��f.Mf N7 r:unlm ,
AGENT AUTHORIZATION FORM
TO WHOM IT MAY CONCERN:
I/we, the undersigned, hereby authorize Land Management Group, Inc. (LMG) to act as our
agent in the determination of jurisdictional wetland boundaries on the subject
property, SSG -1 Tract By way of this form,
I/we additionally authorize access to the site by representatives of the US Army Corps of
Engineers (COE) and the NC Division of Coastal Management (NC DCM) for the purpose of
reviewing the flagged wetland boundary and providing a final jurisdictional determination.
Any questions regarding the jurisdictional determination should be directed to LMG.
Please provide the following information:
Property Address and Parcel ID Number: 315 Airlie Rd., Wilmington, NC 28403; R05700-006-002-000
Current Property Owner Name: SSG -1 LLC
Owner Address and Phone Number: Pam I �.,x474 CAOrt0m' tic, 2220
AN- 312-374D.3
Please answer the followine questions (circle Yes or No):
1. Are you the current owner of the property? Yes or No
2. If you are not the current owner, do you have a option to purchase or a contract to
purchase that allows for environmental due -diligence including the determination of
wetlands? Yes or No
3. If you answered no to the questions above, do you have an existing lease agreement or
option to enter into a lease agreement? Yes or No
Name of Individual/Entity: l_/ W
Signature of Authorized Representative:
Date: 3 to ,,,,2o/ 7
www.Imgroup.net - Phone: [phone] - Fax: [phone]
3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403

I�
PROJECT!
SITE II
C`
x_.
S
(c) OpenStreetMap and contributors, Creative Commons -Share Alike
License (CC -BY -SA), Esri, HERE, DeLorme, Mapmylndia,
OpenStreetMap contributors
'Boundaries are approximate and are not meant to be absolute.
Map Source: ArcGIS Open Street Map SCALE 1" = 1 mile
SSG -1 Tract LMG
315 Airlie Road _"��''� �'���`'
Figure 1
New Hanover County, NC www.lmgroup.net Vicinity Map
3805 Wrightsville Avenue
May 2017 Wilmington, NC 28403
LMG # 01-16-352 Phone: [phone] Fax: [phone]

h
*Boundaries are approximate and are not meant to be absolute.
Map Source: USGS Wrightsville Beach Quadrangle 7.5 minute
SCALE 1" = 500'
SSG -1 Tract LMG
315 Airlie Road _
New Hanover County, NC Figure 2
Y www.lmgroup.net USGS Topographic Map
3805 Wrightsville Avenue
May 2017 Wilmington, NC 28403
LMG # 01-16-352 Phone: [phone] Fax: [phone]

'Boundaries are approximate and are not meant to be absolute.
Map Source: GIS New Hanover County Soils Data SCALE 1 — 200'
SSG -1 Tract LMG
315 Airlie Road �
— Figure 3
New Hanover County, NC www.lmgroup.net Soils Map
3805 Wrightsville Avenue
May 2017 Wilmington, NC 28403
LMG # 01-16-352 Phone: [phone] Fax: [phone]

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Map Source: 2010 GIS World Imagery SCALE 1 — 200'
SSG -1 Tract LMG
315 Airlie Road Figure 4
New Hanover County, NC www.lmgroup.net Aerial Photograph
3805 Wrightsville Avenue
May 2017 Wilmington, NC 28403
LMG # 01-16-352 Phone: [phone] Fax: [phone]

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Figure 5. Original Site Plan with 0.442 acre of wetland impacts.
This plan was dismissed because wetland impacts were considered to be too high.
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s�"^a' PREMIUNARY DESIGN
NOT FOR CONSTRUCTION

AIRLIE AT WRIGHTSVILLE SOUND
NEW HANOVER COUNTY, NORTH CAROLINA
McKim & Creed, Inc. - Project #6536-0003 (40)
Wetland Management Plan
Existing delineated 404 wetlands include two (2) wetland areas located at the southwest (SW)
and southeastern (SE) corners of the property.
SW Wetland:
0.28 Ac.
SE Wetland 1:
0.21
SE Wetland 2:
0.12
Total:
0.61 Ac.
SW Wetland and jurisdictional stream area shall remain undisturbed, resulting in proposed
wetland impacts totaling 0.33 acres. These wetlands have minimal surface flow; however, they
remain saturated due to the staging conditions of the Airlie Lake.
The lake is currently experiencing sedimentation and eutrophication due to untreated offsite
runoff. It routinely stages above the elevation of the existing 36" RCP culvert, which runs under
Airlie Road and connects directly to Airlie Lake, thus leaving the surrounding area in a
submerged state. The location of the existing 36" RCP culvert is shown in the map below (See
Figure 1).
The referenced culvert is dilapidated on the
Airlie Gardens side of Airlie Road, which
causes some ponding on the Airlie Gardens
property. With extensive rainfall, Airlie Lake
could stage back onto the Airlie at
Wrightsville Sound property, creating an
undesirable situation. Airlie Road currently
acts as a dam between the two features, which
could temporarily create a hazardous driving
situation with excessive rainfall.
To mitigate these issues, McKim and Creed,
the engineers for the Airlie at Wrightsville
Sound project, have proposed removing an
existing 36" RCP culvert and redirecting
stormwater westward to a 36" RCP culvert
(marked as existing 36" RCP to remain in
Figure 1), which was recently installed for the
Airlie Forest subdivision and which outfalls to
Airlie Lake.
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Figure 1- Airlie Lake

Airlie at Wrightsville Sound
Wetland Management Plan
Page 2 of 3
The removal of the dilapidated culvert connection would remediate the previously described
ponding issues and would also remove sediment -laden runoff to Airlie Lake, thereby providing
a substantial improvement to the water quality conditions of the lake and in the vicinity. The
Airlie Forest 36" RCP discharges to an engineered plunge pool with a connected outfall channel
on the Airlie Gardens property. Rain gardens have been installed along the outfall channel and
are used to monitor the effectiveness of surface infiltration measures to provide infiltration and
remove total suspended solids. The success of the system has been excellent.
All routed runoff will be treated through a series of infiltration trenches that meet the P90 and
25 -year storm event standards in post -development conditions. Site design provides for the
treatment of site runoff though pervious concrete and infiltration trenches. Infiltration control
measures are established on HSG A sandy soils with adequate infiltration rates. Routed
stormwater will discharge only during emergency overflow conditions controlled by weir
outfall boxes.
Stormwater Management Plan
The proposed development has been designed to cause minimal disturbance to the natural
resources that exist on the site during the construction period, and which create negligible or no
negative impact on these resources in the future. The design of the on -street parking areas utilizes
pervious pavement to intercept sheet flow from roadway areas. The flow is subsequently
collected in either structures or pass through curb cuts, as applicable, to a stormwater BMP.
Stormwater runoff from roadway areas and sidewalks has been designed to be directed to
infiltration galleries located under pervious pavement parking areas and alleys. To the maximum
extent practicable, disconnection of impervious areas will be utilized to allow runoff to pass
through pervious areas prior to collection or discharge to a BMP. In addition, stormwater runoff
from the proposed single-family residential structures will be collected in a roof leader system
and conveyed to the on-site infiltration systems. Where space is available, vegetated infiltration
swales will be used to increase the flow path and time of concentration of stormwater discharges.
The Airlie at Wrightsville Sound project utilizes innovative and sustainable design techniques.
The site plan was developed based on a tree survey to minimize the number of trees removed
with roadways and sidewalks placed to avoid regulated and significant trees to the maximum
extent practicable. Existing vegetation within the property streetyard and interior landscape
courtyards has been substantially preserved and supplemental plantings will be provided to
increase the quality, quantity and diversity of trees and shrubs. Pervious materials are specified
on perimeter parking areas and alleys to reduce the site's impervious area, thereby providing
stormwater infiltration, and pre -treat runoff prior to discharging to stormwater BMPs.
The proposed development will utilize low -impact development (LID) design criteria for
stormwater management to the extent practicable, while still meeting the City's quality and peak
flow attenuation requirements. Although the project is not constrained by the type of stormwater

Airlie at Wrightsville Sound
Wetland Management Plan
Page 3 of 3
control measures that can be used, the project has been designed to provide distributed retention
storage throughout the site to treat runoff at the source. The stormwater management plan will
utilize underground infiltration galleries below pervious pavement in on -street parking areas and
within alleys to treat runoff from impervious surfaces at the source. In addition, the project design
accommodates the maximum the disconnection of impervious areas and lengthen post -
development flow paths.
The following elements of LID design are incorporated into the plan:
a) Small-scale techniques are provided throughout the project to manage precipitation as
close as possible to where it hits the ground. Through the use of localized underground
infiltration galleries and pervious materials, the project will seek to treat runoff at the
source.
b) Devices that allow infiltrating rainfall water to groundwater and evaporating rain water
back to the atmosphere (raingardens, cisterns, dry wells, filter strips, etc.) reduce runoff
volume. This project will use infiltration galleries, vegetated conveyance, disconnection
of impervious areas, pervious hardscape and natural vegetated areas to allow stormwater
to infiltrate rather than being discharged from the site.
Summary
The Airlie at Wrightsville Sound site development plan and stormwater management system
provide a walkable residential community maximizes developable land and preserves high-
quality natural resources through the utilization of the following techniques:
• LID stormwater management techniques and the remediation of detrimental backwater
effects, resulting in a net benefit to the hydrology and ecosystem of the Bradley Creek
watershed.
• Preservation of the high-quality wetlands and natural stream corridor on the southwest
corner of the property with minimal impact to a small section of on-site wetlands.
• Removal of the existing 36" RCP culvert on the southeast corner of the site which
directly discharges to Airlie Lake by re-routing stormwater to a separate 36" RCP that
discharges through an engineered outfall system which is composed of plunge pools
and rain gardens, an engineered system which provides a water quality benefit to Airlie
Lake, which in turn provides a substantial ecological benefit.
• Finally, the Airlie at Wrightsville Sound stormwater management plan proposes to
alleviate potential flooding along Airlie Road and on the Airlie Gardens property while
providing a net benefit to Airlie Lake.