20110252 Ver 1_401 Application_20110311

A
LMG
LAND MANAGEMENT GROUP ixc.
Environmental Consultants
March 11, 2011
TO: Mr. Chad Coburn
NCDENR Division of Water Qual ty
127 Cardinal Drive Extension
Wilmington, NC 28405
RE: Calabash Town Center; Brunswick County, NC
Non-404 Jurisdictional General Permit Application
NOV-2011-OP-0001
Dear Chad:
2 0 1 1 0 2 5 2
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Enclosed is an after-the-fact Non-404 Jurisdictional General Permit Application for your
review. This application is submitted on behalf of Integrated Properties, LLC for Calabash Town
Center, which is a 35-acre tract located at the intersection of Clariday Road and Old Georgetown
Road in Calabash, NC. The applicant was unaware that the site contained wetlands and
constructed multi-family units and stormwater ponds on the property. Approximately 1.93 acres
of non-404 jurisdictional wetlands were excavated or filled. The applicant seeks to keep all of the
1.93 acres of impact because it would be too costly to remove the constructed buildings and/or
relocate the stormwater ponds.
As requested, a soil scientist with LMG evaluated the potential drainage effect of the
stormwater ponds on adjacent wetlands using a DrainMod analysis (enclosed). He determined
that the ponds are not having a drainage effect on adjacent wetlands because a 4-foot deep ditch
located along the northern property line that was constructed in the early 1980's lowered the
water table of these wetlands prior to disturbance. Therefore, the wetland disturbance from the
ponds is confined to direct impacts.
Because of the drainage effect of the ditch, the non-404 jurisdictional wetlands within
this site were of low quality before construction occurred. For this reason, we request that
mitigation requirements be minimized as much as possible. The applicant agrees to preserve
remaining wetlands on site (1.66 acres) and buy into the Stone Farm Mitigation Bank at a ratio to
be agreed upon by DWQ and the applicant.
The Pre-Construction Notification form, associated maps, and site plan are enclosed for
your review. The permit application fee has been sent to the Raleigh office. Please contact me if
you have any questions. Thank you for your assistance with this project.
www.lmgroup.net • [e-mail] • Phone: [phone] • Fax: [phone]
3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522, Wilmington, NC 28402
Sincerely,
t
Kim Williams
Environmental Scientist
Encl.
C: Mr. Jim Myers, Integrated Properties LLC
Mr. Phil Norris, Norris and Tunstall Engineers
Mr. Ian McMillan, DWQ
www.lmgroup.net • [e-mail] • Phone: [phone] • Fax: [phone]
3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522, Wilmington, NC 28402

OF W A rFR
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Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.3 Dec 10 2008
Pre-Construction Notification (PCN) Form
A. Applicant Information
1. Processing
1a. Type(s) of approval sought from the
Corps: N/A
El Section 404 Permit El Section 10 Permit
1b. Specify Nationwide Permit (NWP) number: N/A or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps? N/A ? Yes ? No
1d. Type(s) of approval sought from the DWQ (check all that apply):
? 401 Water Quality Certification - Regular ® Non-404 Jurisdictional General Permit
? 401 Water Quality Certification - Express ? Riparian Buffer Authorization
1 e. Is this notification solely for the record
because written approval is not required? For the record only for DWQ 401
Certification:
? Yes ® No For the record only for Corps Permit:

? Yes ? No
1f. Is payment into a mitigation bank or in-lieu fee program proposed for mitigation
of impacts? If so, attach the acceptance letter from mitigation bank or in-lieu
fee program. ® Yes ? No
1 g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below. ® Yes ? No
1h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ? Yes ® No
2. Project Information ;
2a. Name of project: Calabash Town Center
2b. County:
14
Brunswick County
2c. Nearest municipality / town: Calabash
2d. Subdivision name: N/A
2e. NCDOT only, T.I.P. or state
project no: et/a??F
N/A
3. Owner Information ch
3a. Name(s) on Recorded Deed: Shallotte Partners LLC & Calabash Town Center LLC
3b. Deed Book and Page No. 3027/0466; 3032/1199; 3032/1185
3c. Responsible Party (for LLC if
applicable): Mr. Jim Myers
3d. Street address: PO Box 240351
3e. City, state, zip: Charlotte, NC, 28224
3f. Telephone no.: [phone]
3g. Fax no.:
3h. Email address: [e-mail]
Page 1 of 12
PCN Form - Version 1.3 December 10, 2008 Version
4. Applicant Information (if different from owner):
4a. Applicant is: ? Agent ? Other, specify:
4b. Name: Mr. Jim Myers
4c. Business name
(if applicable): Integrated Properties, LLC
4d. Street address: P.O. Box 240351
4e. City, state, zip: Charlotte, NC 28224
4f. Telephone no.: [phone]
4g. Fax no.:
4h. Email address: [e-mail]
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 12
B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID): 2410000125; 2410000114; 2410M001; 2410M002;
2410M006; 2410M011; 2410M020
1 b. Site coordinates (in decimal degrees): Latitude: 33.9003 N Longitude: 78.5520 W
(DD.DDDDDD) (-DD.DDDDDD)
1 c. Property size: 35 acres
2. Surface Waters
2a. Name of nearest body of water (stream, river, etc.) to Unnamed tributary of Calabash River
proposed project:
2b. Water Quality Classification of nearest receiving water: SA; HSW
2c. River basin: Lumber 03040207
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:
Project area consists of residential and commercial development. Roads, stormwater ponds, and multi-family units have
been built. The applicant was unaware that the site contained wetlands prior to development. Approximately 1.93 acres of
non-404 jurisdictional wetlands were excavated or filled on this property. This is an after-the-fact permit application that
seeks to keep the entire wetland disturbance. Adjacent land use is residential and recreational (a golf course).
3b. List the total estimated acreage of all existing wetlands on the property:
Approximately 3.59 acres of non-404 jurisdictional wetlands existed on the property, of which 1.93 acres have been
excavated or filled.
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property:
N/A
3d. Explain the purpose of the proposed project:
The purpose of the project was to construct a mixed use (multi-family and commercial) development for the community.
3e. Describe the overall project in detail, including the type of equipment to be used:
The site was cleared and fill material was brought in to grade the site. Roads, stormwater ponds, multi-family units, and
parking areas were constructed. The applicant proposes to keep approximately 1.93 acres of non-404 jurisdictional
wetland impact associated with stormwater excavation and building construction.
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
? Preliminary ®Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas? Agency/Consultant Company:

Name (if known): Land Management Group, Inc.
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
A USACE jurisdictional determination was issued to Shallotte Partners, LLC on 02/22/08 stating that no wetlands
regulated by Section 404 of the Clean Water Act existed on property. The owners misunderstood this to mean no
wetlands existed on the site.
Page 3 of 12
PCN Form - Version 1.3 December 10, 2008 Version
Project Information and Prior Project History
5. 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 12
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
® Wetlands ? Streams - tributaries ? Buffers
? Open Waters ? Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a. 2b. 2c. 2d. 2e. 2f.
Wetland impact Type of jurisdiction
number- Type of impact Type of wetland Forested (Corps - 404, 10 Area of impact
Permanent (P) or (if known) DWQ - non-404, other) (acres)
Temporary T
W1 ® P ? T Excavation for Non-404 ® Yes* ? Corps 47
0
stormwater pond Jurisdictional ? No ® DWQ .
W2 ®P ? T Fill for building Non-404 ® Yes* ? Corps 0.26
Jurisdictional ? No ® DWQ
W3 ®P ? T Excavation for Non-404 ® Yes* ? Corps 0
53
stormwater pond Jurisdictional ? No ® DWQ .

W4 ®P ? T Excavation for
stormwater pond
Non-404
®Yes
? Corps
0
67
and fill for building Jurisdictional ? No ®DWQ .
W5 ? P ? T ? Yes ? Corps
? No ? DWQ
W6 ? P ? T ? Yes ? Corps
? No ? DWQ
2g. Total wetland impacts 1.93
2h. Comments: *This is an after-the-fact permit application. Areas were forested prior to disturbance.
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)
S1 ? P ? T ? PER ? Corps
? INT ? DWQ
S2 ? P ? T ? PER ? Corps
? INT ? DWQ
S3 ? P ? T ? PER ? Corps
? INT ? DWQ
S4 ? P ? T ? PER ? Corps
? INT ? DWQ
S5 ? P ? T ? PER ? Corps
? INT ? DWQ
S6 ? P ? T ? PER ? Corps
? INT ? DWQ
3h. Total stream and tributary impacts
3i. Comments:
Page 5 of 12
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 individual) list all open water impacts below.
4a.
Open water
impact number -
Permanent (P) or
Temporary T 4b.
Name of waterbody
(if applicable) 4c.

Type of impact 4d.

Waterbody type 4e.

Area of impact (acres)
01 ?P?T
02 ?P?T
03 ?P?T
04 ?P?T
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction:
If pond or lake construction proposed, then complete the chart below.
5a.

Pond ID 5b.

Proposed use or purpose 5c.
Wetland Impacts (acres) 5d.
Stream Impacts (feet) 5e.
Upland
(acres)
number of pond
Flooded
Filled
Excavated
Flooded
Filled
Excavated
Flooded
Pi Stormwater 0.53
P2 Stormwater 0.47
P3 Stormwater 0.41
5f. Total 1.41
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:
Page 6 of 12
6. Buffer Impacts (for DWQ): NIA
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 miti gation, then you MUST fill out Section D of this form.
6a. ? Neuse ? Tar-Pamlico ? Other:
Project is in which protected basin? ? Catawba ? Randleman
6b. 6c. 6d. 6e. 6f. 6g.
Buffer impact
number-
Reason
Buffer
Zone 1 impact
Zone 2 impact
Permanent (P) or for Stream name mitigation (square feet) (square feet)
Temporary T impact required?
?Yes
B1 ?P?T ? No
? Yes
B2 ? P ? T ? No
?Yes
B3 ?P?T ? No
6h. Total buffer impacts
6i. Comments:
Page 7 of 12
D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
Prior to construction, the applicant did not know that wetlands existed on the property. Some buildings and stormwater ponds
were constructed in non-404 jurisdictional wetlands. It is not economically feasible for the applicant to remove the existing
buildings or ponds. A soil scientist with LMG evaluated the potential drainage effect of the stormwater ponds on adjacent
wetlands using a DrainMod analysis (enclosed). He determined that the ponds are not having a drainage effect on adjacent
wetlands because a 4-foot deep ditch located along the northern property line that was constructed in the early 1980's
lowered the water table of these wetlands prior to disturbance. Therefore, the wetland disturbance from the ponds is confined
to direct impacts.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
A sedimentation and erosion control plan was developed prior to site construction.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for
impacts to Waters of the U.S. or Waters of the State? ® Yes ? No
2b. If yes, mitigation is required by (check all that apply): ® DWQ ? Corps

2c. If yes, which mitigation option will be used for this
project?

pro ® Mitigation bank

? Payment to in-lieu fee program

® Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank:
3a. Name of Mitigation Bank: Stone Farm Mitigation Bank
3b. Credits Purchased (attach receipt and letter) Type Non-riparian Quantity To be determined
3c. Comments: Impacts occurred to wetlands of low quality. Therefore, we request that mitigation requirements be minimized
as much as possible.
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: N/A
4c. If using stream mitigation, stream temperature: ? warm ? cool ?cold
4d. Buffer mitigation requested (DWQ only): N/A square feet
4e. Riparian wetland mitigation requested: N/A acres
4f. Non-riparian wetland mitigation requested: N/A acres
4g. Coastal (tidal) wetland mitigation requested: N/A 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.
The applicant agrees to preserve remaining non-404 jurisdictional wetlands on the site (- 1.66 acres).
Page 8 of 12
PCN Form - Version 1.3 December 10, 2008 Version
6. Buffer Mitigation (State Regulated Riparian Buffer Rules) - required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires ? Yes ® No
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. N/A
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. 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).
N/A
6h. Comments: N/A
Page 9 of 12
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 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?
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:
A stormwater permit from NC DWQ was obtained prior to construction (SW8 080622 Mod).
? 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: NIA
3a. In which local government's jurisdiction is this project?
? 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:
® 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? First page of Stormwater Permit is 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 10 of 12
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
? Yes ? No
letter.)
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ® Yes ? No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b. Is this an after-the-fact permit application? ® Yes ? No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
The developer was unaware that the site contained wetlands prior to development. Approximately 1.93 acres of non-404
jurisdictional wetlands were filled on this property for the construction of stormwater ponds and multi-family units.
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.
The project will not provide utilities or access to adjacent areas.
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.
The existing project ties into the local wastewater system.
Page 11 of 12
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 GIS layer was used to determine the presence of federally listed species. No federally
protected species were noted on or within a one-half mile of the site. Additionally, LMG evaluated the site prior to
development for federally-protected species and habitat that may support these species. This evaluation found that the
site did not contain habitat that would support federally-protected species.
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. The site is not considered EFH.
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 National Trust for Historic Preservation website mapping resource was used to determine the presence of cultural
resources. No cultural resources were found.
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 floodplain. The project site does not fall within these
boundaries.
Kim Williams 03/10/2011
Applicant/Agent's Printed Name Applicant/Agent's Signature Date
(Agent's signature is valid only if an authorization letter from the applicant
is provided.
Page 12 of 12
AGENT AUTHORIZATION FORM
TO WHOM IT MAY CONCERN:
Uwe, the undersigned, hereby authorize Land Management Group, Inc. to act as our agent in the
preparation and representation of information related to the Section 401 Water Quality
Certification application for the Calabash Town Center site. All questions in regards to this
project should be directed to Land Management Group, Inc.
Sincerely,
Owner/Applicant
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Calabash Town Center Land Management Group, Inc.
Shallotte Partners LLC Environmental Consultants Figure 1
Brunswick County, NC Wilmington, N.C. Site Location Map
40-09-217 March 2011
i
Boundary information taken
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Map Source: Calabash, N.C., 1990, USGS 7.5' Topographic quadrangle.
Calabash Town Center Land Management Group, Inc.
Shallotte Partners LLC Environmental Consultants
Brunswick County, NC Wilmington, N.C.
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North Carolina Department of Environment and Natural Resources
Division of Water Quality
Beverly Eaves Perdue Coleen H. Sullins Dee Freeman
Governor Director RECEIVED Secretary
May 3, 2010
MAY 0 6 210
James B. Myers, III, Managing Member
Integrated Properties, LLC, Member/Manager 1 KT
Shallotte Partners, LLC
P.O. Box 240351
Charlotte, NC 28225
Subject: State Stormwater Management Permit No. SW8 080622 Mod
Calabash Town Center
High Density Commercial Wet Pond Project
Brunswick County
Dear Mr. Myers:
The Wilmington Regional Office received a complete minor modification to the existing State Stormwater
Management Permit for Calabash Town Center on May 3, 2010. Staff review of the plans and specifications
has determined that the project, as proposed,, will comply with the Stormwater Regulations set forth in Session
Law 2006-246 and Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 080622, dated May 3, 2010,
for the construction and operation of the subject project.
This permit shall be effective from the date of issuance until September 18, 2018, and shall be subject to the
conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance
requirements in this permit. Failure to establish an adequate system for operation and maintenance of the
stormwater management system will result in future compliance problems.
If any parts, requirements, or limitations contained-in this permit are unacceptable, you have the right to
request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit.
This request must be In the form-of a Written petition,-oonformirig to Chapter 1-5013-of -th-6 Nortfi Carolina
General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-
7447. Unless such demands are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda Lewis,
or me at [phone].
Sincerely,
Georgette D. Scott
Stormwater Supervisor
Division of Water Quality
GDS/arl: S:IWQSISTORMWATERtPERMIT1080622.may10
cc: Brunswick County Inspections
Jeff Phillips, Brunswick County Engineering
Phil Norris, P.E., Norris, Kuske, & Tunstall
Wilmington Regional Office Stormwater File
DWQ Central Files
Wilmington Regional Office
127 Cardinal Drive Extension, Wilmington, North Carolina 28405 A?One 1 1
Phone: [phone] FAX: [phone] Customer Serrice:1-877-623.6748 North C aro l i na
Internet: www.ncvvaterqualify.org `'V
An Equal OpportunilytAlfirmafiveAcGon Employer ?/

DRAINMOD ANALYSIS REPORT
CALABASH TOWN CENTER
Calabash, NC
Perfonned by:
Land Management Group, Inc.
P.O. Box 2522
Wilmington, NC 28402
Performed for:
Integrated Properties, LLC
P.O. Box 240351
Charlotte, NC 28224
March 2011
I. Scope:
Land Management Group, Inc (LMG) evaluated existing soils and hydrologic
conditions on the Calabash Town Center tract located in Calabash, NC. The
hydrologic and morphological soil properties associated with soils within two
wetland determinations were examined on February 14, 2011. This report
summarizes the hydrologic conditions and the resulting conclusions derived
from those observations.
Also included in this report is a DRAINMOD simulation of a thirty year
weather record. This is used to determine drainage response a given soil type
may have under a prescribed drainage regime. This methodology will also
predict the number of years the hydrologic criterion is met in order to
determine whether the site is a jurisdictional 404 wetland.
The results of the DRAINMOD simulation were used to plot a profile of each
stormwater pond and the corresponding drainage impact from the ditch along
the north property line. Outlet elevations of the stormwater ponds are plotted
to determine their elevation relative to the seasonal high water table as
determined by the DRAINMOD assessment in order to "quantify any affect on
adjacent wetlands, surface waters, and/or buffers where applicable."
II. Soil Evaluations:
LMG evaluated the soil types within the delineated wetland areas using a
series of hand auger borings. These are described using the Field Book for
Describing and Sampling Soils (USDA, 1998) to a depth of five feet and are
shown in Figure One. These areas were selected as being representative of
areas within the existing wetland delineations. Profile descriptions are
included in Appendix A.
LMG also evaluated the soil permeability rates at representative areas.
Saturated hydraulic conductivity measurements were performed with a
compact constant head permeameter at selected hand auger borings
locations shown in Figure One. A compact constant head permeameter
(CCHP) was used to determine the saturated hydraulic conductivity of the
soil. Particular care was given to testing soil horizons transmitting
precipitation downward through the soil profile. The compact constant head
permeameter was used to evaluate the most restrictive horizon at each of the
nine locations for a total of nine measurements. The depths vary from 15
inches to 24 inches depending upon the texture of the limiting subsoils. The
data for each CCHP was recorded and combined by taking the geometric
mean of all readings.
Calabash Town Center
Groundwater Hydrology Assessment
The hydraulic conductivity of the CCHP data was calculated utilizing Glover's
solution to Richard's equation for a shallow well pump in test for all data
points that met required assumptions and test parameters, as indicated by the
CCHP product manufacturer. Details of the methodology are described in
Methods of Soil Analysis, Part 1 (A. Klute, 1986) and Compact Constant
Head Permeameter: A Convenient Device for Measuring Hydraulic
Conductivity (Amoozegar, 1992).
III. DRAINMOD:
DRAINMOD is a hydrologic model that simulates water table levels in a soil
plot across time from input data consisting of precipitation, evapotranspiration,
infiltration, runoff, and subsurface drainage (Skaggs, 1999). DRAINMOD was
developed specifically for shallow water table soils with parallel drains that
occur on nearly level landscapes. The model computes a water balance on a
soil pedon of unit cross-sectional area. A water balance is determined on a
day-by-day, hour-by-hour basis, and a water table depth (WTD) is computed
for each time step.
IV. DRAINMOD Application:
The application of DRAINMOD to determine the wetland hydrologic status of
the Calabash Town Center site was a two-step process. First, model inputs
were determined for the period of observation. DRAINMOD inputs were
prepared for the soil properties onsite. Seven ditch spacings and two ditch
depths were proposed for each transect and existing ditch depths were taken
from the topographic survey. The second step was to use the model with
long term weather data from a nearby weather station to predict water table
response to rainfall, infiltration, drainage, ET, and other hydrologic processes
for a long-term period of record. Simulations were conducted for a 30-year
period of record (1971-2000) using precipitation and temperature data from
the Brunswick County Airport, KSUT-ASOS, supported by NOAA.
Simulations were conducted for the site parameter values for the composite
soil properties. Algorithms in the model were used to predict the maximum
consecutive period that the water table was within 30 cm (12 inches) of the
surface during the growing season of every year and to count and tabulate
the years in which that period exceeded the wetland hydrologic threshold of
14 days. The long term predictions were then analyzed to determine if the
site satisfies the wetland hydrologic criteria in more than one-half the years
(e.g. more than 25 years).
Calabash Town Center
Groundwater Hydrology Assessment
2
V. Results:
The data from Table One shows the seven ditch spacings and the three ditch
depths used in this DRAINMOD assessment. The existing ditch is 4.2 feet
deep along the northern boundary. All three stormwater ponds drain into this
existing feature. The model indicates that the Murville soils with a ditch depth
of 4.4 feet and with a "mirror" drain at a spacing of 550 feet apart the area in
the middle of the two ditches would drain to a depth of 12 inches sufficiently
that the wetland hydrology criterion would be met in only 8 years out of 30.
This site lacks the "mirror" drain so effectively the drainage area extends
outward from the ditch a distance of 275 feet.
TABLE ONE:

Ditch
Spacing
Lateral
Drainage
Effect
Ditch
Depth
Soil
Series
Growing
Season
Length Number of
Years Meeting
Hydrology
Criteria (out of
30)

Percentage
400 200 2 Murville 365 22 73.3%
350 175 2 Murville 365 18 60.0%
300 150 2 Murville 365 9 30.0%

500 250 3.2 Murville 365 15 50.0%
450 225 3.2 Murville 365 11 36.7%

600 300 4.4 Murville 365 15 50.0%
550 275 4.4 Murville 365 8 26.7%
The project site plans are shown in Sheet 1 of the attached drawings.
Profiles through each stormwater pond are shown on Sheet 1. Each
stormwater pond profile is plotted on the corresponding Sheets 2 through 4.
Using results from the DRAINMOD the seasonal high water table (SHWT) is
plotted to show the effective drainage away from the ditch. Each profile plot
contains the outlet structure for each pond and the point at which the water
table is 12 inches below the soil surface inside the wetlands.
VI. Conclusions:
The SHWT data indicates that the existing stormwater ponds had no impact
on the adjacent wetlands on this site. All three stormwater ponds have outlet
elevations that are no more than six inches below the seasonal high water
table elevation, based upon the DRAINMOD analysis. The existing ditch
located along the northern property boundary appears to have been in place
Calabash Town Center
Groundwater Hydrology Assessment
3
since the early 1980's and the drainage effect would definitely have altered
the hydrology long ago.
In summary, this site has multiple areas that are proposed for stormwater
basin placement. These areas have soils that have seasonal high water
tables that occur no more than six inches below the existing permanent pool
elevations.
G. Craig Turner
Vice President
NC Licensed Soil Scientist, # 1091
SC Certified Soil Scientist, #57
Land Management Group, Inc.
P.O. Box 2522
Wilmington, NC 28403
910-452-0001 Office
910-452-0060 FAX
cturner@ Imgroup.net
Calabash Town Center
Groundwater Hydrology Assessment
4
S.C Certification
Number 57
Boring 1 Foot Slope 1-2%
A - 0-8" Loamy Sand, granular friable non sticky non plastic, 10YR 2/1.
Bh - 8-15" Loamy Sand, weak medium subangular blocky, friable non sticky non plastic,
IOYR 3/1.
Bw - 15-28" Loamy Sand, weak medium subangular blocky, friable non sticky non
plastic, 2.5Y 4/2.
Btg - 28-57" Sandy Loam with Loamy Sand on ped faces, friable slightly sticky non
plastic, 2.5Y 5/2.
Cg - 57-60"+ Sand, single grained, loose non sticky non plastic, 2.5Y 6/1.
Physical Water: 16"
Boring 2 Side Slope 1-2%
A - 0-9" Loamy Sand, granular friable non sticky non plastic, 10YR 2/1.
Bh - 9-28" Loamy Sand, weak medium subangular blocky, friable non sticky non plastic,
10YR 3/1.
Bw - 28-37" Loamy Sand, weak medium subangular blocky, friable non sticky non
plastic, 2.5Y 4/2.
Eg - 37-43" Sand, single grained, loose non sticky non plastic, 2.5Y 6/1.
Btg - 43-54" Sandy Loam with Loamy Sand on ped faces, friable slightly sticky non
plastic, 2.5Y 511 with 10 YR 5/6 mottles.
Cg - 54-60"+ Sand, single grained, loose non sticky non plastic, 2.5Y 6/1.
Physical Water: 20"
Boring 3 Side Slope 1-2%
A - 0-7" Loamy Sand, granular, very friable non sticky non plastic, l OYR 2/1.
Bh - 7-24" Loamy Sand, weak medium subangular blocky, friable non sticky non plastic,
10YR 3/1.
Cg - 24-55"+ Sand, single grained, loose non sticky non plastic, 2.5Y 6/2.
Physical Water: 17"
Boring 4 Side Slope 1-2%
A - 0-5" Loamy Sand, granular, very friable non sticky, non plastic, l OYR 3/1.
Eg - 5-9" Loamy Sand, granular, very friable non sticky non plastic, 2.5Y 4/2.
Bh - 9-17" Loamy Sand, weak medium subangular blocky, friable non sticky non plastic,
IOYR 3/2.
Bw - 17-34" Loamy Sand, weak medium subangular blocky, friable non sticky non
plastic, 3/1.
Cg - 34-48"+ Sand, single grained, loose non sticky non plastic, 10YR 4/3.
Physical Water: 22"
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