SW3171205 - Braeburn (3)

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Prepared for:
Mattamy Homes
2127 Ayrsely Town Blvd. Suite 201
Charlotte, NC 28273
[phone]
Prepared by:
ESP Associates, P.A■
3475 Lakemont Blvd
Fort Mill, SC 29708
[phone]
CAR 0!�- Project Number FM26.420
i
Original: December 19, 2017
LICENSE N0,
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SoCI A��S
ESP
ESP Associates, P.A.

Table of Contents
1. Project Narrative & Summary
2. Location & USGS Map
3. Soils Map & Information
4. FEMA Flood Insurance Map
S. Erosion Control Calculations
A. Sediment Basin SB -1
B. Sediment Basin SB -2
C. Sediment Basin SB -3
D. Sediment Basin SB -4
E. Sediment Basin SB -5
F. Ditch Calculations
G. Temporary HDPE Pipe Calculations
H. Riprap
6. Storm Drainage Calculations
A.
Storm System A Tabulation
Report & Profiles
B.
Storm System B Tabulation
Report & Profiles
C.
Storm System C Tabulation
Report & Profiles
D.
Storm System D Tabulation
Report & Profiles
E.
Storm System E Tabulation
Report & Profiles
F.
Storm System F Tabulation
Report & Profiles
G.
Storm System G Tabulation
Report & Profiles
H.
Inlet Capacity Chart / Spread Calculations

7. Wet Ponds
A. Wet Pond 1 Pre -Development
B. Wet Pond 1 Post -Development
C. Wet Pond 2 Pre -Development
D. Wet Pond 2 Post -Development
E. Wet Pond 3 Pre -Development
F. Wet Pond 3 Post -Development
G. Wet Pond 4 Pre -Development
H. Wet Pond 4 Post -Development
I. Summary
8. Impervious Area Calculations
9. Drainage Map
10. Appendix
A. Faircloth Skimmer Design
B. Wetlands Reports

1.
Project Narrative & Summary

PROJECT NARRATIVE
The project, "Braeburn" is a proposed single-family residential development
located at 4408 Faith Church Road in the town of Indian Trail, Union County,
North Carolina. This existing site is being developed as a single-family
community with public streets and infrastructure. The purpose of this overall
early erosion control and grading package is to obtain a grading permit for the
project.
The project site is located in Zone X and Zone AE per FIRM Map for Union
County, North Carolina —Map Numbers 3710541900J and 37410542900J, both
with an effective date of October 16, 2008. The overall existing site a
combination of woods and open fields. The site primarily drains southeast
towards a tributary of North Fork Crooked Creek located at the southeast end of
the site. North Fork Crooked Creek borders the northeast side of the site.
Wetlands exist near the creeks bordering the site; however, none are proposed
to be disturbed with the proposed development. Clearing and grubbing shall take
place from an existing driveway located along Faith Church Road to each
sediment basin as is necessary in order to install each sediment basin. Once
sediment basins 1 through 4 and skimmer sediment basin 5 are installed and
stabilized (along with all ditches, slope drain, and riprap), clearing and grubbing
of the remainder of the basin drainage areas shall commence. After clearing and
grubbing, the rest of the site shall be graded. Storm drainage pipes and
structures shall be installed as the basin drainage areas are brought to final
grade. Upon reaching final grade and storm drainage diverted to SB -3, skimmer
sediment basin 5 shall be removed. Approximately 107.56 acres of the site will
be disturbed. A grading and erosion control phasing plan has been provided
within the proposed construction plans.
' On site erosion control measures will be provided throughout the construction
phase. Erosion control measures include four (4) sediment basins and one (1)
skimmer type sediment basin that have been designed to meet the North
Carolina Erosion and Sediment Control Planning and Design Manual.

CONCLUSION
Future detention water quality designs provided for reference. Permit
modifications, if necessary, will be submitted prior to the site infrastructure
stages.
The proposed sediment basins have been designed to meet the erosion and
sedimentation control requirements for a 10 -year storm event. The Faircloth
Skimmer has been adequately sized to control site runoff and release the site's
storm water runoff over a minimum 2 -day period and a maximum 5 -day period.
In conclusion, due to existing site conditions and proposed runoff control
measures, the proposed project is not anticipated to have negative impacts on
downstream or adjacent properties.

i.
Location & USGS Map

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LOCATION MAP
BRAEBURN - PHASE 5 & 6
INDIAN TRAIL, NC
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UserlCorrimunity'
LOCATION MAP
BRAEBURN - PHASE 5 & 6
INDIAN TRAIL, NC
1 " = 19000

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BRAEBURN - PHASE 5 &6
INDIAN TRAIL, NC
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3.
Soils Map & Information

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Hydrologic Soil Group—Union County, North Carolina
(Bonterra - Phase 5 & 6 - Soils Map)
MAP LEGEND
MAP INFORMATION
Area of Interest (Aol)
El
C
The soil surveys that comprise your AOI were mapped at
0
Area of Interest (AOI)
CID
1 24,000
Soils
®
D
Warning Soil Map may not be valid at this scale
Soil Rating
Polygons
A
®
Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
0
misunderstanding of the detail of mapping and accuracy of soil
0
AID
Water
Water Features
placement The maps do not show the small areas of
streams and Canals
contrasting soils that could have been shown at a more detailed
B
scale.
Transportation
BID
Rails
Please rely on the bar scale on each map sheet for map
0
C
opal
Interstate Highways
measurements
0
CID
US Routes
Source of Map Natural Resources Conservation Service
D
Web Soil Survey URL
Major Roads
Coordinate System: Web Mercator (EPSG 3857)
0
Not rated or not available
Local Roads
Maps from the Web Soil Survey are based on the Web Mercator
Soil Rating Lines
Background
projection, which preserves direction and shape but distorts
A
distance and area. A projection that preserves area, such as the
®
Aerial Photography
Albers equal-area conic projection, should be used if more
ss�
A/D
accurate calculations of distance or area are required
w
B
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below
BID
C
Soil Survey Area Union County, North Carolina
v
Survey Area Data: Version 16, Sep 20, 2016
CID
Soil map units are labeled (as space allows) for map scales
D
1 50,000 or larger
. r
Not rated or not available
Date(s) aerial images were photographed Jun 14, 2015—Feb 8,
2017
Soil Rating Points
A
The orthophoto or other base map on which the sod lines were
compiled and digitized probably differs from the background
AID
imagery displayed on these maps As a result, some minor
B
shifting of map unit boundaries may be evident
®
®
BID
USDA Natural Resources Web Soil Survey 9/29/2017
2111111111111 Conservation Service National Cooperative Soil Survey Page 2 of 4

Hydrologic Soil Group—Union County, North Carolina
Hydrologic Soil Group
Bonterra - Phase 5 & 6 - Sods Map
u_SDA Natural Resources Web Soil Survey 9/29/2017
Conservation Service National Cooperative Soil Surrey Page 3 of 4
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
ChA
Chewacla silt loam, 0 to
2 percent slopes,
frequently flooded
B/D
32.4
18.9%
CmB
Cid channery silt loam, 1
to 5 percent slopes
D
338
197%
ScA
Secrest-Cid complex, 0
to 3 percent slopes
C
1003
584%
TaB
Tarrus gravelly silt loam,
2 to 8 percent slopes
B
5.2
30%
Totals for Area of Interest
171.6
100.0%
u_SDA Natural Resources Web Soil Survey 9/29/2017
Conservation Service National Cooperative Soil Surrey Page 3 of 4

Hydrologic Sod Group—Union County, North Carolina
Description
Bonterra - Phase 5 & 6 - Sods Map
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly Impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method Dominant Condition
Component Percent Cutoff. None Specified
Tie-break Rule: Higher
USDA Natural Resources Web Sod Survey 9/29/2017
Conservation Service National Cooperative Sod Survey Page 4 of 4

4.
FEMA Flood Insurance Maps

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EFFECTIVE DATE MAP NUMBER
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