SW7080939_HISTORICAL FILE_20210712

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT. NO. SW
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

wqp
ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Director
NORTH CAROLINA
Environmental Quality
July 12, 2021
Freshwater Traders, LLC
Attention: Robert 0. Oaks, Jr. Manager
P.O. Box 1807
Nags Head, NC 27959
Subject: Stormwater Permit Renewal
Stormwater Management Permit SW7080939
Columbia Park — Phase I
Tyrrell County
Dear Mr. Oakes:
A Division of Energy, Mineral, and Land Resources file review has determined that
Stormwater Permit SV 7080939 for a stormwater treatment system, consisting of a wet
detention pond to serve a proposed Columbia Park — Phase I located off Hwy 64 in
Columbia, NC expires on December 30, 2021. This is a reminder that permit renewal
applications are due 180 days prior to expiration. We do not have a record of receiving
a renewal application.
If you wish to maintain this permit, please submit a completed permit renewal
application along with a $505.00 fee for permit renewal. Permit application forms for
renewal can be found on our website at: https://deq.nc.gov/about/divisions/energy-
mineral-and-land-resources/stormwater/stormwater-program/post-construction-2. North
Carolina General Statutes and the Coastal Stormwater rules require that this property
be covered under a stormwater permit if it is built. If the project has not been built, you
may request that the permit be rescinded.
If you have questions, please feel free to contact me at [phone]. 1 will be glad to
discuss this by phone or meet with you. If you would like, I can e-mail you a copy of the
application forms. You can request a copy by e-mailing me at
roger.thorpe(�ncdenr.gov.
Sincerely,
i
Roger K. Thorpe
Environmental Engineer
�( North Carolina Department of Environmental Quality Division of Energv. Mineral and Land Resources
Washington Regional Office 1 943 Washington Square' Mall I Washington, North Carolina 27889
252.946.6481

I emarle
& ASSOCIATES, LTD.
May 18, 2009
NCDENR Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
ATTN: Mr. William Moore
RE: Columbia Park— Master Plan 8! Phase 1a
Stormwater Management Submittal (SW7080939)
Town of Columbia, Tyrell County
Dear Mr. Moore:
yys� rr v�'nv,�h !i
MAY 2 0 2009
r
Pursuant to our conversation last Thursday, we have added the pond vegetation
summary table and list of wetland plant vendors to sheet C302. I have enclosed two
copies of this drawing for your approval. I understand you will issue the stormwater
management permit for the master plan and phase 1a of Columbia Park upon receipt of
these drawings. If you have any further questions regarding any portion of this
submittal, please do not hesitate to call me.
Sincerely,
VX
Michele J. Morwa , PE
Project Eqineer
cc: Bob Oakes, Freshwater Traders
File 07336c (350)
Engineering — Surveying -- Land Planning
P.O. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

.e
Freshwater Traders, LLC
Attn: Mr. Bob Oakes
PO Box 1807
Nags Head, INC 27959
Dear Mr. Oakes:
Beverly Eaves Perdue, Governor
Dee Freematr, Secretary
North Carolina Department of Environment and Natural Resources
February 4, 2009
Subject: Stormwater Review SW7080939
Columbia Park
Tyrrell County
Coleen H. Sullins, Director
Division of Water Quality
This office received a stormwater application for the subject project on September 30, 2008. Mr.
Mike Morway with Albemarle & Associates submitted a follow-up package, along with revised plans on
December 12, 2008. A preliminary review of your project indicates that before a State Stormwater permit
can be issued, the following additional information is needed:
1. Application indicates total property area 84.4 acres, total project area 10.3 acres, drainage
area 11.89 acres; revise stormwater narrative to explain these numbers.
2. Discharge pipe from outlet structure shows an invert of 1.3; with permanent pool elevation set
at 1.4, this elevation difference will not accommodate the 3.5-inch small diameter orifice.
Please adjust elevations, or otherwise modify outlet orifice.
3. Show non -erosive calculations for pond outlet pipe & overflow structure; provide details &
specifications for rip -rap where needed.
4. Specifications for "wetland seed mixture" are not acceptable. Provide detailed written
vegetation plan for wet pond perimeter shelf. An acceptable vegetation plan should
incorporate the design elements from the Stormwater Best Management Practices
Manual, Chapter 6, BMP Vegetation, and should be prepared by a qualified professional.
5. Revise application, narrative & plans as need to reflect changes.
The above requested information must be submitted to this office prior to March 4, 2009. or your
application will be returned as incomplete. The return of this project will necessitate resubmittal of all
required items including a new application fee. If you need additional time to complete the application
package, please mail or fax your request to this office and include any reason(s) for the time delays.
You should also be aware that the Stormwater Rules require that the permit be issued prior to
any development activity. Construction without a permit is a violation of 15A NCAC 2H.1000 and North
Carolina General Statute 143-215.1 and may result in civil penalties of up to $25,000 per day.
If you have questions, please feel free to contact me at [phone], or you can send a message
to: [e-mail].
Sincerely, e
iIW liam J. Moore
Environmental E gineer
Washington Regional Office
cc: Albemarle & Associates
Tyrrell County Planning/inspections
,,Washington Regional Office p
Phone 919 807fi300 Location N a�hCaro7ltna
Nailing Address ( ) 512 N. Salisbury St. Xa mrally
R 17 Mail Service Center Fax (919) 807fi492 Raleigh, NC 27604
Raleigh, NC 27699-1617
Internet: www newateruualitv.orn Customer Service 1-877-623-6748

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& ASSOCIATES, LTD.
MAR - 4 2009
March 3, 2009
NCDENR Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
ATTN: Mr. William Moore
RE: Columbia Park— Master Plan & Phase 1a
Stormwater Management Submittal (SW7080939)
Town of Columbia, Tyrell County
Dear Mr. Moore:
I have received your letter dated February 4th, 2009 regarding the stormwater submittal
for Columbia Park. I have reviewed your comments and addressed them as follows:
1. Phase 1a is the initial phase of development within an overall "Master Plan" for
this 84.4 acres parcel. Phase 1 a includes a total area of land disturbance (right-
of-ways, lots, open space, and pond grading) of 10.3 acres. An additional 1.59
acres of land included within the 84.4 acre parcel (but not being disturbed) will
subsequently drain into the new pond. This has been noted within the revised
Stormwater Narrative (attached).
2. Pursuant to our email correspondence, this comment will be disregarded.
However, we have included an additional section to the control structure for
further clarification.
3. Open channel calculations (including velocity) for the swale inlet to the pond,
control structure outlet and overflow weir are attached. Additional detail on the
overflow weir is also included.
4. A planting plan for the vegetated shelf has been included on sheet C302. This
has replaced the wetland seed mixture specification as requested.
5. The following information has been included within this package in order to
address your concerns:
• Revised Stormwater Narrative
• Open channel calculations (4 sheets)
• Sheet C301 & C302 (dated 03/02/09) — 2 copies
Engineering -- Surveying -- Land Planning
P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

William Moore
NCDENR-DWQ
March 3, 2009
Page 2 of 2
As noted within the Narrative, the project is the first phase of the 84.4 acres "Master
Plan". The sketch plan for this was included within the initial submittal. Future plans
include the expansion of this pond in a manner that will allow the pond to meet
NCDENR standards as future phases of the project proceed. If you have any further
questions regarding any portion of this submittal, please do not hesitate to call me.
Sincerely,
L
Project
cc: Bob Oakes, Freshwater Traders
File 07336c (350)

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& ASSOCIATES, LTD.
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MAR - 4 2009
Columbia Park
Stormwater Management Narrative
prepared for
Freshwater Traders, PO Box 1807, Nags Head, NC, 27959
Revised — March 2, 2009
Existing Conditions: The location of the proposed development known as Columbia
Park is an 84.4 acre farmland recently annexed into the Town of Columbia in Tyrell
County. The Natural Resource Conservation Service Soil Survey for Tyrell County has
mapped the soils to consist primarily of Augusta, Portsmouth and Tomately. The site is
relatively level, with elevations ranging from 2 to 4 feet above sea level (NAVD 1988)
excluding ditch inverts. The 100 year flood elevation is 5.1. Vegetation on the site
consists mainly of crops as the site currently being farmed. Farm ditches on centers of
approximately 170' are currently collecting runoff from the site and conveying it to
ditching on the west and northwest edge of the property, where it leaves the site and
drains to the Scuppernong River.
Proposed Development: Freshwater Traders intends to develop a Planned Unit
Development on the site. The site has been annexed into the Town of Columbia and is
zoned to allow this use. The sketch plan for the project was developed during a design
charette that involved input from planners, town residents, the owner and the project
architect as well as Albemarle & Associates. The plan included the use of stormwater
management features as a primary component of the project, using two ponds within
shared open space throughout the development as well as the use of open drainage
systems where feasible. Due to the relatively low elevations within the site, the fill from
the pond excavation would be utilized to raise the majority of the lots and roadways.
Freshwater Traders began this project with a mandate to provide stormwater retention
and treatment for a minimum volume equivalent to the runoff produced from a 2" runoff
event.
Phase one of Columbia Park implements the conceptual ideas brought about from the
planning stages to convey stormwater. Lots have been raised and crowned to drain
runoff to the right-of-ways and access easements. A variety of roadway sections have
been utilized to convey this runoff. Yaupon Drive is widened to provide on street
parking, and therefore includes standard curb and gutter to convey runoff to curb inlets
that direct runoff into adjacent swales. Hickory Drive and Salt Marsh Lane utilizes a
concrete valley gutter to provide a border to the pavement while allowing for more runoff
to pass over adjacent pervious lawn area during larger events with greater depth of
flow. Juniper and Woodmint Lane provide a concrete border for the edge of pavement,
allowing for runoff to sheet flow into adjacent swales. Curb and gutter has been
provided where swale slopes exceed 6:1 in order to reduce the potential for erosion.
Ultimately, all runoff is conveyed from the lots and roadways through larger swales and
Engineering -- Surveying -- Land Planning
P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

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Columbia Park
Stonmwater Management Narrative
Revised March 2, 2009
Page 2 of 2
into the forebay section of the pond. This initial phase of the project disturbs
approximately 10.3 acres of the 84.4-acre parcel. An addition 1.59 acres of the 84.4-
acre parcel will drain into this pond, yielding a total drainage area of 11.89 acres
contributing to the pond within the initial phase of its construction.
NCDENR Permitting Compliance: The site is being developed per the High Density
Stormwater Management Option as set forth in 15A NCAC 02H.1005(3)(b). To
accommodate this, a portion of the central pond will be excavated and shaped in order
to manage and treat the runoff from the initial phase. The project utilized a drainage
system comprised of curb and gutter, open swales, curb inlets and culverts in order to
capture all runoff from the project and convey it to the proposed on -site pond. Future
plans include the expansion of this pond in a manner that will allow the pond to meet
NCDENR standards as future phases of the project proceed. This phased approach will
allow for the supply of excavated material as the project requires, rather than allowing
large stockpile volumes to remain on site between phases. The expansion of this pond
is being performed in a manner that will allow the pond to remain functional as the
expansions occur. Discharge from the pond will be routed into existing farm ditches that
ultimately direct runoff into the Scuppernong River (class SC).

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& ASSOCIATES, LTD.
Engineering - Surveying -Land Planning
JOB Cat; r� ,3..R
SHEET NO. i OF :1
CALCULATED BY DATE 103 joy
CHECKED BY DATE

Channel Report -Z1y
Hydraflow Express by Inlelisolve
Monday, Mar 2 2009, 3:51 PM
Columbia Park - Stormwater Control
Pond Inlet Swale
Triangular
Highlighted
Side Slope (z:1)
= 4.00
Depth (ft)
= 2.21
Total Depth (ft)
= 3.00
Q (cfs)
= 32.00
Area (sgft)
= 19.54
Invert Elev (ft)
= 1.30
Velocity (fUs)
= 1.64
Slope (%)
= 0.10
Wetted Perim (ft)
= 18.22
N-Value
= 0.030
Crit Depth, Yc (ft)
= 1.32
Top Width (ft)
= 17.68
Calculations
EGL (ft)
= 2.25
Compute by:
Known Q
Known Q (cfs)
= 32.00
Elev (ft)
5.00
4.00
r ITU
1.00
als
5 10
Section
15 20
Reach (ft)
25 30
Depth (ft)
3.70
2.70
1.70
0.70
-0.30
-1.30
35

Channel Report 31,4
HydraFlow Express by Intelisolve
Monday, Mar 2 2009, 3:56 PM
Columbia Park - Stormwater Control
Structure Discharge
Triangular
Highlighted
Side Slope (z:1)
= 1.50
Depth (ft)
= 0.35
Total Depth (ft)
= 2.20
Q (cfs)
= 0.110
Area (sqft)
= 0.18
Invert Elev (ft)
= 1.30
Velocity (fUs)
= 0.60
Slope (%)
= 0.20
Wetted Perim (ft)
= 1.26
N-Value
= 0.030
Crit Depth, Yc (ft)
= 0.21
Top Width (ft)
= 1.05
Calculations
EGL (ft)
= 0.36
Compute by:
Known Q
Known Q (cfs)
= 0.11
Elev (ft) Section
4.00
3.50
7-
3.00
2.50 - z
2.00
1.50
1.00
0.50
0
1 2 3 4 5
Reach (ft)
6 7 8

Channel -Report 4!y
Hydraflow Express by Intelisolve Monday, Mar 2 2009, 4:4 PM
Columbia Park - Stormwater Control Emergency Weir Discharge
Trapezoidal
Highlighted
Botom Width (ft)
= 20.00
Depth (ft)
= 0.88
Side Slope (z:1)
= 3.00
Q (cfs)
= 32.00
Total Depth (ft)
= 1.00
Area (sqft)
= 19.92
Invert Elev (ft)
= 3.30
Velocity (ft/s)
= 1.61
Slope (%)
= 0.20
Wetted Perim (ft)
= 25.57
N-Value
= 0.035
Crit Depth, Yc (ft)
= 0.43
Top Width (ft)
= 25.28
Calculations
EGL (ft)
= 0.92
Compute by:
Known Q
Known Q (cfs)
= 32.00
Elev (ft)
5.00
0
4.50
4.00
3.50
3.00
2.50
0 5 10
Section
15 20 25
30 35
Depth (ft)
1.70
1.20
0.70
11*461
-0.30
-0.80
40
Reach (ft)

>
All
emarle
& ASSOCIATES, LTD.
December 11, 2008
NCDENR Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
ATTN: Ms. Heather L. Steinbacher
DEC 2lu"�8
iUJ',"17�odn
RE: Columbia Park —Phase la, Stormwater Management Submittal
(SW7080939)
Town of Columbia, Tyrell County
Dear Heather:
I have received your letter dated November 24t", 2008 regarding the stormwater
submittal for Columbia Park. I have reviewed your comments and addressed them as
follows:
1. The pond grading has been adjusted to incorporate 10' vegetated shelf (1Oh: 1v)
requested in the revised BMP manual standards. Due to the nature of the pond
location within a planned park, we have also maintained the 6h:1v shelf
previously for an additional depth below this shelf to provide additional safety.
This grading is reflected in the grading plan (C301), the pond detail (C302) and
on the wet pond supplement as well.
2. Pond vegetation has been specified for the shelf and is noted on the detail and
pond construction notes (C302).
3. Tables for the pond volumes are provided within the pond calculations. These
have been revised based upon comment 1.
4. The drainage area has been delineated on the grading plan (C301)
5. The entire property boundary has been shown on the cover sheet.
6. A legend has been provided on the grading plan (C301)
7. The soils report has been updated and additional detail based upon field
investigations has been provided.
8. The rim elevation has been revised. Please note that due to dimensional
restrictions, the rim elevation is above the storage elevation for the pond. The
weir provide along the pond bank will provide release of runoff above the storage
elevation.
Engineering — Surveying — Land Planning
P 0. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

Heather L. Stembacher
NCDENR-DWQ
December 11, 2008
Page 2 of 2
9. The Stormwater Management Narrative has been updated and includes greater
detail of the drainage system features.
10. No off site drainage will be entering the site. The installation of diversion ditch will
redirect any runoff from outside the project limits.
11. The lot numbers have been included on the grading plan (C301)
12. A note stating that no wetlands existing on the site has been added to sheet
C302.
13. All revised plans (Cover sheet, C301 & C302), revised Calculations (pond &
runoff), the wet pond supplement and the application as well as the Soils and
Stormwater Narratives are included.
If you have any further questions regarding any portion of this submittal, please do not
hesitate to call me.
Sincerely,
Mich el J/Morw y, PE
Project E ginee
Enc: Dwgs (Cover Sheet revised 12/11/08 C301 revised 12/11/08, C302 revised 12/11/08)
Wet Pond Supplement (revised 12/11/08)
Form SW-101 (page 2)
Pond & Runoff Calculations (revised 12/11/08)
Soils Narrative (dated 12/10/08)
Stormwater Management Narrative (revised 12/11/08)
cc: Bob Oakes, Freshwater Traders
File 07336c (350)

�OF W ATF9Q Michael F. Easley, Governor
�0 William G. Ross Jr., Secretary
CI)r North Carolina Department of Environment and Natural Resources
% 1
p Y Coleen H. Sullins, Director
Division of Water Quality
November 24, 2008
Mr. Bob Oakes, Manager
Freshwater Traders, LLC
Post Office Box 1807
Nags Head, North Carolina 27959
Subject: Stormwater Review SW7080939
Columbia Park — Phase I
Tyrrell County
Dear Mr. Oakes
This office received a Coastal Stormwater permit application and plans for the subject project on
September 30, 2008. A preliminary review of your project indicates that before a State Stormwater
permit can be issued the following additional information is needed:
1. The design of a wet detention basin must include a 10-foot wide (minimum) vegetated shelf
around the full perimeter of the basin. The inside edge of the shelf shall be no deeper than
6-inches below the permanent pool level, and the outside edge shall be 6-inches above the
permanent pool level; resulting in a 10-foot wide shelf with 10:1 slopes. Revise any
supplements as needed.
2. Specify the pond side slope vegetation and provide wetland species planting plan that will
be planted on the 10:1 shelf. Please note that Weeping Love Grass is not recommended for
use in North Carolina as a permanent ground cover and should not be specified for this
pond.
3. Please provide a table of elevations, areas and volumes in the pond and forebay, beginning
at the bottom, going up to the temporary pool elevation. This will help support your
conclusions that sufficient volume has been provided at the design pool elevation, that the
permanent pool volume is 251,639 cubic .feet, and that the provided forebay volume is
54,103 cubic feet.
4. Provide a drainage delineation map.
5. Provide a plan showing.the entire property boundary.
6. Provide a legend showing all line types used.
7. Provide a detailed soils report providing the results of an on -site soil investigation to verify
information submitted from the County Soil Survey Report.
8. Verify the rim invert of 8.80 on the pond outlet detail. Clarify if the rim elevation is the
temporary pool elevation.
9. Provide a detailed explanation of the proposed drainage features.
Norih Carolina Division of Water Quality Internet: www rtcwatercuali[v.ore One 943 Washington Square Mall Phone [phone] NOrthCarolrrla
Washington, NC 27889 Fax [phone] Natu +i7 l ff
An Equal OpportunitylAKrmative Action Employer -50%Recycled110% Post Consumer Paper [i s`i Kss�/

10. Clarify if any off -site drainage will be entering the site.
11. Number all of the proposed lots.
12. Please have the wetlands delineated on the plans or note that there are no wetlands onsite.
Only a person with the appropriate knowledge of wetlands may make this determination.
13. Please do not forget to have any revised plans and calculations signed, sealed and dated.
The above requested information must be received in this office prior to December 24, 2008 or
your application will be returned as incomplete. The return of this project will necessitate resubmittal of
all required items including the application fee. If you need additional time to submit the required
information, please mail or fax your request for time extension to me at the Letterhead address and
include the application number on the request. The request must include justification for the amount of
additional time needed. The request will only be granted for justifiable delays that are unforeseen and
beyond the owner or consultant's control.
You should also be aware that the Stormwater Rules require that the permit be issued prior to
any development activity. Construction without a permit is a violation of 15A NCAC 2H.1000 and North
Carolina General Statute 143-215.1 and may result in civil penalties of up to $25,000 per day.
If you have questions, please feel free to contact me at [phone].
Sincerely,
�yec�klw�t^�s-�m)1�chn L
Heather L. Steinbacher
Environmental Engineer
cc: Michael J. Morway, P.E., Albemarle & Associates, Ltd.
Washington Regional Office

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& ASSOCIATES, LTD.
Columbia Park
Soils Narrative
prepared for the
Freshwater Traders
December 5, 2008
The location of the proposed development known as Columbia Park is an 84.4 acre
farmland recently annexed into the Town of Columbia, in Tyrell County, North Carolina.
The Natural Resource Conservation Service Soil Survey for Tyrell County has mapped
the soils to consist primarily of Augusta, Portsmouth and Tomately. The site, which is
currently under agricultural use, is relatively level with elevations ranging from 2 to 4
feet above sea level (NAVD 1988) excluding ditch inverts. The 100 year flood elevation
is 5.1. Vegetation on non -improved portions of the site consists mainly of crops. The site
is current drained by farm ditches on centers of approximately 170'. The runoff from the
property is collected through existing lateral farm ditches and conveyed to the northwest
corner of the property prior to leaving the site. A soils investigation was performed by
Albemarle & Associates. The investigation included a boring in the location of the
proposed pond using a hand auger and other field observations. This was then
compared to NRSC soils reports and the geotechnical investigation for the project. The
results of this investigation are summarized as follows:
Stormwater Management Pond:
The initial excavation of the Stormwater Management Pond is proposed at the northeast
edge of the initial phase (phase 1a) of the project. A soil boring in the vicinity of this
pond was taken on November 19t', 2008. This boring found a layer of topsoil typical of
agricultural land, followed by a layer of loam, clay and sand mix to a depth of
approximately 24" below the surface. This was followed by a layer of grey clay with
sand approximately one -foot in depth. Below this depth, the soils became predominantly
sandy, with traces of clay. The Natural Resources Conservation Service has mapped
this area as Augusta Loamy Fine Sand. Although field investigations found larger
amounts of clay than expected, the observations otherwise compared fairly well with the
NRCS soils description. Based upon soil coloration, the seasonal high water table has
been estimated to be 24" below the surface elevation of 3.4 msl. For design purposes,
an ESHWT elevation of 1.4 has been used. Adjacent ditch inverts graded to elevations
between 1.0 and 1.5. These ditches were primarily dry, with occasional sections found
to contain standing water. The proposed pond permanent pool elevation has been
established at 1.4 based upon the existing ditch elevations and soil observations. A
copy of the NRCS Soils Survey for the site and soils boring report are attached.
Engineering — Surveying — Land Planning
P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

07336C - Columbia Park
Soil Boring Log
Soil Borin
Depth
B-1
0" to 6"
Topsoil
6" to 12..
Brown clay w/
sand & silt
12" to 18"
Brown clay w/
sand & silt
Tan clay w/ sand
18" to 24"
& silt (mottling
found)
24" to 30"
Grey clay w/
sand
30" to 36"
Grey clay w/
sand
36" to 42"
Grey sand w/
clay
42„ +
Grey sand w/
clay
Soil Type
At (Augusta) fine
sandy loam
Date of Boring
11/19/08
Ex. Ground
Elevation (ft.
3.4
above MSL)
Depth to
24
ESHWT (in)
ESHWT
14
Elevation
Depth to Water
36
table (in)
Estimated Water
table Elevation
0.4
ft
Prepared by Albemarle and Associates, Ltd.

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17 -

Soil Map —Tyrrell County, North Carolina
(Columbia Park)
MAP LEGEND
MAP INFORMATION
Area of Interest (AD])
IZ Very Stony Spot
Original soil survey map sheets were prepared at publication scale.
Area of Interest (AOI)
Viewing scale and printing scale, however, may vary from the
..._._
y Wet Spot
original. Please rely on the bar scale on each map sheet for proper
Soils
Other
map measurements.
Soil Map Unite
Special line Features
Source of Map: Natural Resources Conservation Service
Special
Point Features
_ Gully
Web Soil Survey URL http7lwebsoilsurvey.nres.usda.gov
1•a
Blowout
Coordinate System: UTM Zone 18N
CD
Borrow Pit
Short Steep Slope
This product is generated from the USDA-NRCS certified data as of
Other
the version date(s) listed below.
X
Clay Spot
Poitticai Features
Soil Survey Area: Tyrrell County, North Carolina
•
Closed Depression
Municipalities
Survey Area Data: Version 10, Jan 9, 2008
x
Gravel Pit
Cities
Date(s) aerial images were photographed: 1/3/1998
.,
Gravely Spot
e a a Urban Areas
The orthophoto or other base map on which the soil lines were
Landfill
Water Features
compiled and digitized probably differs from the background
Oceans
imagery displayed on these maps. As a result, some minor shifting
^.
Lava Flow
of map unit boundaries may be evident.
Marsh
- -. Streams and Canals
yt
Mine or Quarry
Transportation
+++ Rails
®
Miscellaneous Water
Roads ,
(D
Perennial Water
,� Interstate Highways
Rock Outcrop
US Routes
}
Saline Spot
State Highways
Sandy Spot
n„ Local Roads
Severely Eroded Spot
Other Roads
0
Sinkhole
i
Slide or Slip
q
Sodic Spot
s
SpoilArea
4
Stony Spot
I:.M)A Natural Resources Web Soil Survey 2.0 9/29/2008
e111m Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map —Tyrrell County, North Carolina
Columbia Park
Map Unit Legend
Tyrrell County, North Carolina (NC177)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
At
Augusta fine sandy loam
18.8
21.9%
Ch
Chowan sift loam, frequently
flooded
0.0
0.0%
Pt
Portsmouth loam, rarely flooded
38.7
45.1 %
To
Tomotley fine sandy loam,
rarely flooded
28.3
33.0%
Totals for Area of Interest (AOI)
85.91 100.0%
USDA Natural Resources Web Soil Survey 2.0 9/29/2008
am Conservation Service National Cooperative Soil Survey Page 3 of 3

Volumetric Runoff Calculations
Simple Method
Project Name: Columbia Park
Project Area Description
Basin Information
7 4,
existing
0
0
0
0
0
0
0
existing (to
remain)
0
0
0
0
0
0
0
proposed
(additional)
175,674
80,089
0
8,724
0
0
264,467
Receiving Stream Name
Scuppernong River
Receiving Stream Class & Index Number
Drainage Area
517,990 SF
Existing Impervious Area
0 SIF
Proposed Impervious Area
264,487 SF
% Impervious Area (total)
51.1%
Impervious Surface Area
On -site Buildings or Lot BUA
175,674 SF
On -site Streets
80,089 SF
On -site Parking
0 SF
On -site Sidewalks/Concrete
8,724 SF
Other on -site
0 SF
Off -site
0 SF
Total.
264,487 SF
Runoff Calculations (Simple Method)
NCDENR
1yr/24hr(pre)
lyr/24hr(post)
Design Runoff (in)
1 -;.J
2- �. ck
3.3
3.3
Total Area (Ac.)
517,990
517,990
517,990
517,990
Coverage
51.1 %
51.1 %
0.0%
51.1 %
R(v)
0.510
0.510
0.050
0.510 Pre -Post increase
Rainfall Volume
21,995
43,990
7,122
72,583 65,461
NCDENR Design: 21,995
(S) (033 /(.89 a) f 3

STORMWATER MANAGEMENT CALCULATIONS - WET DETENTION POND DESIGN
Project
Drainage Area
Receiving Wet Pond
Columbia Park
Wet Detention Pond Volume Calculations
By: mjm
Date: 12/11/08
Description
Forebay
Basin
Description
elev
(ft)
area
(SO
volume
(cf)
elev
(ft)
area
(SO
volume
(cf)
Excavated Bottom
-7.0
1,856
-8.0
15,008
Bottom (basin sed. clean -out elev.)
-5.0
19,305
-4.0
20,905
20,105
Bottom (forbay sed. clean -out elev.)
-3.0
6,149
-3.0
22,568
21,737 .
-2.0
7,383
0
-2.0
24,442
23,505
-1.0
8,829
8,106
-1.0
26,379
25,411
0.0
12,784
10,807
0.0
31,427
28,903
Bottom of Bench
0.9
16,019
12,961
0.9
35,591
30,158
Permanent Pool Elevation :
1.4
18,244
8,566
1.4
38,513
18,526
Permanent Pool Volume:
40,440
168,344
Top of Bench
1.9
20,543
9,697
1.9
41,542
20,014
Storage Elevation
2.2
21,323
6,280
2.2
42,543
12,613
Storage (Temp. Pool) Volume:
16,977
32,627
Total Permanent Pool Volume:Volume :
208,784
Forebay Percentage of Total Volume :
19.4%
Total Storage Volume:
48,603
Total Excavated Volume Below Storage Elevation :
315,352
Pond Design Parameters Pond Drawdown Calculations
Storage Elevation :
2.2
(ft.)
Area at Storage Elev.:
63,866
(s.f.)
Permanent Pool Elev.:
1.4
(ft.)
Area at Perm. Elev.:
56,757
(s.f.)
Storage Volume:
48,603
(c.f.)
Design Volume:
21,995
(c.f.)
Orifice :
3.50
(in)
Discharge coefficient:
0.6
Avergae Depth:
3.7
Design Volume =
21,995
cf
Design Storage Height =
0.80
ft
Average Head =
0.12
ft.
Discharge Coefficient =
0.60
Area of Orifice =
0.0668
sf.
Discharge Rate =
0.1118
cfs.
Drawdown Calculations
NCDENR Design Volume =
55
hrs
Stora a Volume =
121
hrs
Percent Coverage: 51 %
Required SA/DA ratio: 5.1 (coastal county, 90% tss removal, depth =
Req'd Surface Area : 0.61 (ac) ( 1.30 provided)
26,417 (sf) ( 56,757 provided)
3.5 ft.)
Prepared by Albemarle and Associates, Ltd.

�3-�
Albemarle
& ASSOCIATES, LTD.
Columbia Park
Stormwater Management Narrative
prepared for
Freshwater Traders, PO Box 1807, Nags Head, NC, 27959
Revised — December, 2008
Existing Conditions: The location of the proposed development known as Columbia
Park is an 84.4 acre farmland recently annexed into the Town of Columbia in Tyrell
County. The Natural Resource Conservation Service Soil Survey for Tyrell County has
mapped the soils to consist primarily of Augusta, Portsmouth and Tomately. The site is
relatively level, with elevations ranging from 2 to 4 feet above sea level (NAVD 1988)
excluding ditch inverts. The 100 year flood elevation is 5.1. Vegetation on the site
consists mainly of crops as the site currently being farmed. Farm ditches on centers of
approximately 170' are currently collecting runoff from the site and conveying it to
ditching on the west and northwest edge of the property, where it leaves the site and
drains to the Scuppernong River.
Proposed Development: Freshwater Traders intends to develop a Planned Unit
Development on the site. The site has been annexed into the Town of Columbia and is
zoned to allow this use. The sketch plan for the project was developed during a design
charette that involved input from planners, town residents, the owner and the project
architect as well as Albemarle & Associates. The plan included the use of stormwater
management features as a primary component of the project, using two ponds within
shared open space throughout the development as well as the use of open drainage
systems where feasible. Due to the relatively low elevations within the site, the fill from
the pond excavation would be utilized to raise the majority of the lots and roadways.
Freshwater Traders began this project with a mandate to provide stormwater retention
and treatment for a minimum volume equivalent to the runoff produced from a 2" runoff
event.
Phase one of Columbia Park implements the conceptual ideas brought about from the
planning stages to convey stormwater. Lots have been raised and crowned to drain
runoff to the right-of-ways and access easements. A variety of roadway sections have
been utilized to convey this runoff. Yaupon Drive is widened to provide on street
parking, and therefore includes standard curb and gutter to convey runoff to curb inlets
that direct runoff into adjacent swales. Hickory Drive and Salt Marsh Lane utilizes a
concrete valley gutter to provide a border to the pavement while allowing for more runoff
to pass over adjacent pervious lawn area during larger events with greater depth of
flow. Juniper and Woodmint Lane provide a concrete border for the edge of pavement,
allowing for runoff to sheet flow into adjacent swales. Curb and gutter has been
provided where swale slopes exceed 6:1 in order to reduce the potential for erosion.
Engineering — Surveying — Land Planning
P.O. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

Columbia Park
Stormwater Management Narrative
Revised December, 2008
Page 2 of 2
Ultimately, all runoff is conveyed from the lots and roadways through larger swales and
into the forebay section of the pond.
NCDENR Permitting Compliance: The site is being developed per the High Density
Stormwater Management Option as set forth in 15A NCAC 02H.1005(3)(b). To
accommodate this, a portion of the central pond will be excavated and shaped in order
to manage and treat the runoff from the initial phase. The project utilized a drainage
system comprised of curb and gutter, open swales, curb inlets and culverts in order to
capture all runoff from the project and convey it to the proposed on -site pond. Future
plans include the expansion of this pond in a manner that will allow the pond to meet
NCDENR standards as future phases of the project proceed. This phased approach will
allow for the supply of excavated material as the project requires, rather than allowing
large stockpile volumes to remain on site between phases. The expansion of this pond
is being performed in a manner that will allow the pond to remain functional as the
expansions occur. Discharge from the pond will be routed into existing farm ditches that
ultimately direct runoff into the Scuppernong River (class SC).

lbemarle
& ASSOCIATES, LTD.
September 29, 2008
NCDENR Division of Water Quality
943 Washington Square Mall
Washington, NC 27889
ATTN: Mr. Bill Moore
RE: Columbia Park, High Density Stormwater Management Submittal
Columbia, Tyrell County
Dear Bill:
SEP-, 3 0 2,008
l.,a IAY I,MlMe
Please find the enclosed Stormwater Management Permit Application for Columbia Park in Columbia NC.
The information included within the attached submittal include:
• NCDENR stormwater management permit application (1 original & 1 copy)
• Review Fee ($505)
• Pond supplement (1 original & 1 copy)
• Pond Maintenance Agreement (1 original & 1 copy)
• stormwater management narrative (1 original & 1 copy)
• stormwater runoff calculations (1 original & 1 copy)
• Plan C301 & C302 (2 copies)
• Sketch Plan - master plan for the development (1 copy)
• Boundary Survey (1 copy)
If you have any further questions regarding any portion of this submittal, please do not hesitate to call me.
Sincerely,
�, I
Mich. I J
Project Er
cc:
File
Engineering -- Surveying — Land Planning
P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

SEP 3 n 2008
Ib marle -
e n�
&ASSOCIATES, LTD. 1 "rA1* Q_I+IV�i:��%
Columbia Park
Stormwater Management Narrative
prepared for the
Freshwater Traders, PO Box 1807, Nags Head,
September 25, 2008
Existing Conditions: The location of the proposed development known as Columbia Park is an
84.4 acre farmland recently annexed into the Town of Columbia in Tyrrell County. The Natural
Resource Conservation Service Soil Survey for Tyrell County has mapped the soils to consist
primarily of Augusta, Portsmouth and Tomately. The site is relatively level, with elevations
ranging from 2 to 4 feet above sea level (NAVD 1988) excluding ditch inverts. The 100 year
flood elevation is 5.0. Vegetation on non -improved portions of the site consists mainly of crops.
And the site currently being farmed. The site is current drained by farm ditches on centers of
approximately 170'. The runoff is conveyed offsite through existing collector ditches on the west
and northwest edge of the property.
Proposed Development: Freshwater Traders intends to develop a Planned Unit Development
on the site. The site has been annexed into the Town of Columbia and zoned to allow this use.
The sketch plan for the project was developed during a design charette that involved input from
planners, town residents, the owner and the project architect as well as Albemarle & Associates.
The plan included the use of stormwater management features as a primary component of the
project, using two ponds within shared open space throughout the development as well as the
use of open drainage systems where feasible. Freshwater Traders began this project with a
mandate to provide stormwater retention and treatment for a minimum volume equivalent to the
runoff produced from a 2" runoff event.
NCDENR Permitting Compliance: The site is being developed per the High Density
Stormwater Management Option as set forth in 15A NCAC 02H. 1 005(3)(b). The central pond
planned to manage and treat the runoff from a majority of the project including this portion. The
stormwater runoff from the initial phase of this development will be within a portion of this pond,
which will excavated to the meets the needs of this work. The project utilized a drainage system
comprised of curb and gutter, open swales, curb inlets and culverts in order to capture all runoff
from the project and convey it to the proposed on -site pond. Future plans include the expansion
of this pond in a manner that will allow the pond to meet NCDENR standards as future phases
of the project proceed. This phased approach will allow for the supply of excavated material as
the project requires, rather than allowing large stockpile volumes to remain on site between
phases. The expansion of this pond is being performed in a manner that will allow the pond to
remain functional as the expansions occur. Discharge from the pond will be routed into existing
farm ditches that ultimately direct runoff into the Scuppernong River (class SC).
Engineering — Surveying — Land Planning
P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948
Telephone: [phone] Fax: [phone]

Soil Map -Tyrrell County, North Carolina
(Columbia Park)
N Meters
A 0 so 100 200 300
Feer
0 300 am 1,200 1,800
USDA Natural Resources Web Soil Survey 2.0 9/29/2008
iM Conservation Service National Cooperative Soil Survey Page 1 of 3

Soil Map —Tyrrell County, North Carolina
(Columbia Park)
MAP LEGEND
MAP INFORMATION
Area of Interest (AOI)
IZ very Stony Spot
Original soil survey map sheets were prepared at publication scale.
Area of Interest (AOI)
Viewing scale and printing scale, however, may vary from the
t Wet Spy
original. Please rely on the bar scale on each map sheet for proper
Soils
Other
map measurements.
Soil Map Units
Special Lim Features
Source of Map: Natural Resources Conservation Service
Special
Point Features
Gutty
Web Soil Survey URL: http://viebsoilsumey.nrm.usda.gov
ry
Blowout
Coordinate System: UTM Zone 18N
Short Steep Slope
®
Borrow Pit
This product is generated from the USDA-NRCS certified data as of
Other
the version date(s) listed below.
X.
Clay spot
Political Features
Soil Survey Area: Tyrrell County, North Carolina
♦
Closed Depression
Municipalities
Survey Area Data: Version 10, Jan 9, 2008
X
Gravel Pit
® Cities
Date(s) aerial images were photographed: 1/3/1998
..
Gravely Spot
Q Urban Ames
The orthophoto or other base map on which the soil lines were
Landfill
Water Features
compiled and digitized probably differs from the background
Oceans
imagery displayed on these maps. As a result, some minor shifting
A
Lava Flow
of map unit boundaries may be evident.
elcc
Marsh
Streams and Canals
1t
Mine or Quarry
Transportation
i t+ Rails
Oo
Miscellaneous Water
Roads
©
Perennial Water
Interstate Highways
�.
Rock Outcrop
,. US Routes
}
Saline Spot
State Highv ys
Sandy Spot
f„ Local Roads
.�
Severely Eroded Spot
Other Roads
0
Sinkhole
Slide or Slip
g
Sodic Spot
$
Spoil Area
Q
Stony Spot
tsDA Natural Resources Web Soil Survey 2.0 9/29/2008
"ailiffil Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map —Tyrrell County, North Carolina
Columbia Park
Map Unit Legend
Tyrrell County, North Carolina (NC177)
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOl
At
Augusta fine sandy loam
18.8
21.9%
Ch
Chowan sift loam, frequently
flooded
0.0
0.0%
Pt
Portsmouth loam, rarely flooded
38.7
45.1 %
To
Tomotley fine sandy loam,
rarely flooded
28.3
33.0%
Totals for Area of Interest (AOI)
85.9
100.0%
Natural Resources Web Soil Survey 2.0 9/29/2008
Conservation Service National Cooperative Soil Survey Page 3 of 3

Volumetric Runoff Calculations
Simple Method
Project Name: Columbia Park
Project Area Description
Basin Information
existing
0
0
0
0
0
0
0
existing (to
remain)
0
0
0
0
0
0
0
proposed
(additional)
175,674
60,089
0
8,724
0
0
264,487
Receiving Stream Name
Scuppernong River
Receiving Stream Class 8 Index Number
Drainage Area
448,428 SF
Existing Impervious Area
0 SF
Proposed Impervious Area
264,487 SF
% Impervious Area (total)
59.0%
Impervious Surface Area
On -site Buildings or Lot BUA
175,674 SF
On -site Streets
80,089 SF
On -site Parking
0 SF
On -site Sidewalks/Concrete
8,724 SF
Other on -site
0 SF
Off -site
0 SF
Total:
264,487 SF
Runoff Calculations (Simple Method)
1yr/24hr(pre)
1 yr/24hr (post)
Design Runoff (in)
1
2 3.3
3.3
Total Area (Ac.)
448,428
448,428 448,428
448,428
Coverage
59.0%
59.0% 0.0%
59.0%
R(v)
0.581
0.581 0.050
0.581 Pre -Post increase
Rainfall Volume
21,705
43,410 6,166
71,626 65,461
NCDENR Design: 21,705
Scr 0 2008

STORMWATER MANAGEMENT CALCULATIONS - WET DETENTION POND DESIGN
iaroject Columbia Park By: mjm
Drainage Area - Date : 09/22/08
Receiving Wet Pond -
Wet Detention Pond Volume Calculations
forebay
basin
forebay
basin
total
Description
elev
area
area
volume
volume
volume
ft
sf
sf
cf
cf
cf
Bottom
-8.0 0 14,028
0
-7.0 1,584 15,370
792
14,699
15,491
-4.0 4,633 19,788
9,326
52,737
62,063
Bench
-1.5 7,885 25,811
15,648
56,999
72,646
Permanent Pool Elevation : 1.0 14,785 32,670
28,338
73,101
101,439
Permanent Pool Volume:
54,103
197,536
251,639
Storage Elevation
2.0 18,081 36,597
16,433
34,634
51,067
Storage (Tempos Pool) Volume :
16,433
34,634
51,067
Total Volume:
70,536
232,170
302,705
Forebay Percentage of Total Volume:
22%
Pond Design Parameters
Storage Elevation :
2.0
(ft.)
Area at Storage Elev.:
54,678
(s.f.)
Permanent Pool Elev.:
1.0
(ft.)
Area at Perm. Elev.:
47,455
(s.f.)
Storage Volume:
51,067
(c.f.)
Design Volume:
21,705
(c.f.)
Orifice:
2.50
(in)
Discharge coefficient:
0.6
Pond Drawdown Calculations
Design Volume =
21,705
cf
Design Storage Height =
1.00
ft
Average Head =
0.40
ft.
Discharge Coefficient =
0.60
Area of Orifice
= 0.0341
sf.
Discharge Rate =
0.1033
cfs.
Time to release 1" runoff =
58
hrs
Avergae Depth: 5.3
Percent Coverage: 59%
Required SA/DA ratio: 4.1 (coastal county, 90% tss removal, depth = 5.3 ft.)
Req'd Surface Area : 0.42 (ac) ( 1.09 provided)
Prepared by Albemarle and Associates, Ltd.

Volumetric Runoff Calculations
t Simple Method
Y�
Project Name: Columbia Park
Project Area Description
Basin Information.
existing
0
0
0
0
0
0
0
existing (to
remain)
0
0
0
0
0
0
0
proposed
(additional)
175,674
80,089
0
8,724
0
0
264,487
Receiving Stream Name
Scuppernong River
Receiving Stream Class & Index Number
Drainage Area
448,428 SF
Existing Impervious Area
0 SF
Proposed Impervious Area
264,487 SF
% Impervious Area (total)
59.0%
Impervious Surface Area.
-
On -site Buildings or Lot BUA
175,674 SF
On -site Streets
80,089 SF
On -site Parking
0 SF
On -site Sidewalks/Concrete
8,724 SF
Other on -site
0 SF
Off -site
0 SF
Total:
264,487 SF
Runoff Calculations (Simple Method)
lyrl24hr(pre)
lyrl24hr(post)
Design Runoff (in)
1
2 3.3
3.3
Total Area (Ac.)
448,428
448,428 448,426
448,428
Coverage
59.0%
59.0% 0.0%
59.0%
R(v)
0.581
0.581 0.050
0.581 Pre -Post increase
Rainfall Volume
21,705
43,410 6,166
71,626 65,461
NCDENR Design: 21,705
SEP 3 0 2006

STORMWATER`MANAGEMENT CALCULATIONS - WET DETENTION POND DESIGN
PrdjLzct
►'Drainage Area
Receiving Wet Pond
Columbia Park
Wet Detention Pond Volume Calculations
By: mjm
Date : 09/22/08
forebay
basin
forebay
basin
total
Description
elev
area
area
volume
volume
volume
ft
it
I sf
cf
cf
cf
Bottom
-8.0 0 14,028
0
-7.0 1,584 15,370
792
14,699
15,491
-4.0 4,633 19,788
9,326
52,737
62,063
Bench
-1.5 7,885 25,811
15,648
56,999
72,646
Permanent Pool Elevation:
1.0 14,785 32,670
28,338
73,101
101,439
Permanent Pool Volume:
54,103
197,536
251,639
Storage Elevation
2.0 18,081 36,597
16,433
34,634
51,067
Storage (Temporary Pool) Volume:
16,433
34,634
61,067
Total Volume:
70,536
232,170
302,705
Forebay Percentage of Total Volume:
22%
Pond Design Parameters Pond Drawdown Calculations
Storage Elevation :
2.0
(ft.)
Area at Storage Elev.:
54,678
(s.f.)
Permanent Pool Elev.:
1.0
(ft.)
Area at Perm. Elev.:
47,455
(s.f.)
Storage Volume:
51,067
(c.f.)
Design Volume:
21,705
(c.f.)
Orifice:
2.50
(in)
Discharge coefficient:
0.6
Design Volume =
21,705
Cf
Design Storage Height =
1.00
ft
Average Head =
0.40
ft.
Discharge Coefficient =
0.60
Area of Orifice
= 0.0341
sf.
Discharge Rate =
0.1033
cfs.
Time to release 1" runoff =
58
hrs
Avergae Depth: 5.3
Percent Coverage: 59%
Required SA/DA ratio: 4.1 (coastal county, 90% tss removal, depth = 5.3 ft.)
Req'd Surface Area : 0.42 (ac) ( 1.09 provided)
Prepared by Albemarle and Associates, Ltd.

ryd
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