SW5241001_Stormwater Report_20241118

STORMWATER
MANAGEMENT REPORT
FOR
COLLEGE ST TOWNHOMES
FRANKLINTON, FRANKLIN COUNTY, NC
AUGUST 26, 2024
PREPARED BY:
FLM Engineering, Inc.
PO Box 91727
1111 Raleigh, NC 27675
919.423.8975
NC License No. C-4222
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Table of Contents
1.0 Introduction 1
2.0 Site Description 1
3.0 Proposed Development 1
4.0 Stormwater Management 2
4.1 Design Data and Methodologies 2
4.2 Pre-development Analysis 2
4.3 Post-development Analysis 3
4.4 Stormwater Management Summary 4
4.5 Nutrient Reduction 5
5.0 Seasonal High Water Table 5
6.0 Limitations 5
Tables
Table 4-1 Pre-development Hydrologic Model Results
Table 4-2 Post-development Hydrologic Model Results
Table 4-3 Stormwater Management Summary
Table 4-4 Nutrient Loading Summary
©2024 FLM Engineering, Inc. Page ii of iii August 26, 2024

Appendices
Appendix A FEMA Firm Map
Appendix B USGS Map Excerpt
Appendix C Soils Map Excerpt
Appendix D NRCS Soil Report
Appendix E NOAA Rainfall Data
Appendix F Pre-Development Watershed Map
Appendix G Pre-Development Hydrologic Model
Appendix H Post-Development Watershed Map
Appendix I Post-Development Hydrologic Model
Appendix J Simple Method Calculations
Appendix K SCM Supplemental Form
Appendix L Draw Down Calculations
Appendix M Rip Rap Energy Dissipator Calculations
Appendix N Operations & Maintenance Agreement
Appendix 0 SNAP Tool Version 4.2
Appendix P SHWT Report
Appendix Q Impervious Area Calculations
©2024 FLM Engineering, Inc. Page iii of iii August 26, 2024

1.0 Introduction
College St Townhomes is a proposed 79-unit townhomes development with associated site
infrastructure. This report details the stormwater management design for the project.
2.0 Site Description
College St Townhomes is a proposed 79-unit townhome development on approximately 22 acres
located on College Street in Franklinton, North Carolina (Franklin County PIN 1865-14-4278).
The existing site is generally wooded with no existing impervious surface. The site is bordered
on all sides by rural residential and agricultural land except for the north side, which is bordered
by College Street.
The site was investigated for the presence of wetlands and streams by Soil & Environmental
Consultants, Inc. There are three jurisdictional, buffered streams on the site: one running from
north to south through the middle of the site, a second running from west to east through the
middle of the site, and a third running from east to west along the northeastern boundary. There
are some jurisdictional wetlands associated with the east-west streams. The site is located within
the Town of Franklinton and is subject to Phase II Post-construction Stormwater requirements.
Based on a review of Federal Emergency Management Agency (FEMA) Flood Insurance Rate
Map (FIRM) number 3720186400K, dated April 16, 2003, no portion of the site lies within FEMA
designated 100-year or 500-year floodplains. The FEMA FIRM is included as Appendix A.
Excerpts from the United States Geological Survey(USGS)topographic 7.5' quadrangle map and
USDA NRCS Soil Survey Map are included within Appendices B and C, respectively. The
property generally drains from the north to the south. Topography on the site ranges from
elevation 370' to elevation 340'. Soils on the site are Hydrologic Soil Groups (HSGs) B and D as
described in the National Resources Conservation Service (NRCS) soils report in Appendix D.
3.0 Proposed Development
The proposed development will consist of 78 single-family residential lots and associated site
improvements. The site will drain to one (1) stormwater control measure (SCM). The total onsite
©2024 FLM Engineering, Inc. Page 1 of 6 August 26, 2024

proposed impervious surface area for the project is approximately 231,325 square feet, or 5.31
acres, which is 24.1% of the site as shown by the calculations in Appendix Q. Because the site
contains more than 24% built-upon area, the project is considered high density by the Phase II
Post-construction Stormwater standards.
4.0 Stormwater Management
4.1 Design Data and Methodologies
The design of the proposed stormwater management facilities was performed in accordance with
the North Carolina Department of Environmental Quality (NCDEQ) Stormwater Design Manual
and the Phase II Post-construction Stormwater requirements. Per the Phase II standards, high
density projects must use structural stormwater management systems that will:
• Control and treat runoff from the first one inch of rain;
• Draw down the treatment volume no faster than 48 hours, but no slower than 120 hours;
• Discharge the storage volume at a rate equal to or less than the pre-development
discharge rate for the 1-year, 24-hour storm; and
• Remove an eighty-five percent (85%) average annual amount of Total Suspended Solids
(TSS).
HydroCAD Version 8.50, a computer modeling software package, was used for the analysis of
stormwater routing and hydrology of the existing and proposed watersheds. The hydrology
calculations were performed using the Natural Resources Conservation Service (NRCS) Soil
Conservation Service (SCS) Technical Release 55 (TR-55) methodology. Franklin County lies
within the Type II rainfall distribution. The rainfall amounts for the site were obtained from the
National Oceanic and Atmospheric Administration (NOAA) and are included in Appendix E.
4.2 Pre-development Analysis
The pre-development watersheds were approximated based on recent aerial photography of the
site and topographic data. The peak flow rate for the 1-year, 24-hour storm event is based on the
topography, land use cover (such as open space, grass, woods, etc.), and soil type.
©2024 FLM Engineering, Inc. Page 2 of 6 August 26, 2024

The 15.445-acre existing watershed was modeled in HydroCAD as one subcatchment as
described below. Refer to Appendix F for the pre-development watershed map.
• Subcatchment 1 S (Pre-development DA-1): Subcatchment 1 S is 59.801 acres and
drains from northwest to southeast. A time of concentration of 8.6 minutes was calculated
for the subcatchment using the TR-55 method.
The pre-development hydrologic model is included in Appendix G. Table 4-1 summarizes the pre-
development hydrologic model results.
Table 4-1
Pre-development Hydrologic Model Results
Subcatchment 1-year, 24-hour Storm Event Pre-
development Peak Flow (CFS)
Pre-development DA-1 30.38
4.3 Post-development Analysis
An analysis of the post-development runoff was performed using the same methods, parameters,
and assumptions as described in the pre-development analysis above. Based upon the hydrologic
calculations, the project does not create an increase in the peak runoff rate for the 1-year, 24-
hour storm event. Refer to Appendix H of this report for the post-development watershed map.
The 59.801-acre watershed was modeled in HydroCAD as two subcatchments as described
below.
• Subcatchment 2S (Post-development to SCM DA-1A): Subcatchment 2S is 8.55 acres
and includes the area draining to the proposed stormwater control measure. A
conservative time of concentration of six minutes was used for the subcatchment.
• Subcatchment 3S (Post-development Bypass DA-1 B): Subcatchment 3S is 51.251
acres and includes the area bypassing the proposed stormwater control measure. A time
of concentration of 8.6 minutes was calculated for the subcatchment using the TR-55
method.
©2024 FLM Engineering, Inc. Page 3 of 6 August 26, 2024

The post-development hydrologic model is included in Appendix I. Table 4-2 summarizes the pre-
development hydrologic model results.
Table 4-2
Post-development Hydrologic Model Results
Subcatchment 1-year, 24-hour Storm Event Post-
development Peak Flow (CFS)
Post-development DA-1 29.91
4.4 Stormwater Management Summary
This project will not increase peak flow rate for the 1-year, 24-hour storm event. Stormwater
facilities that do not increase the peak flow rate help prevent adverse downstream impacts from
flooding and erosion. Table 4-3 compares the pre-development and post-development peak flow
rates for the design storm event.
Table 4-3
Stormwater Management Summary
1-year, 24-hour Storm 1-year, 24-hour Storm
Subcatchment Event Pre-development Event Post- % Difference
Peak Flow (CFS) development Peak
Flow (CFS)
DA-1 30.38 29.91 -1.5%
The stormwater control measure (SCM) was sized to control and treat runoff from the first one
inch of rain and to provide peak rate of runoff attenuation. The minimum required treatment
volume for the wetland was determined using the Discrete Curve Number Method as shown in
Appendix J.
The supplemental form for the proposed stormwater wetland is included in Appendix K. The
proposed stormwater wetland is anticipated to draw down the design volumes within two to five
days. Draw down calculations are provided in Appendix L. The inlet and outlet velocities are
reduced to non-erosive velocities through the use of rip rap energy dissipators, the calculations
for which are included in Appendix M. An operations and maintenance agreement for the SCM
is included in Appendix N.
©2024 FLM Engineering, Inc. Page 4 of 6 August 26, 2024

4.5 Nutrient Reduction
The SNAP Tool Version 4.2 was used to calculate the pre- and post-development nutrient loads
and is included in Appendix O. The spreadsheet indicated that nitrogen loading in the post-
development with SCM condition is below the target of 4.0 pounds per acre per year and that the
phosphorus loading in the post-development with SCM condition is below the 0.8 pounds per acre
per year threshold. Thus, no additional nutrient buydown is required.
As shown in the Nutrient Export Summary of the tool, Table 4-5 summarizes the nutrient loads
for the pre-, post-, and post-development with SCM conditions.
Table 4-5
Nutrient Loading Summary
Nutrient Pre-development Post-development Post Development
with SCMs
Total Nitrogen 1.15 4.06 2.39
Loading (Ibs/ac/yr)
Total Phosphorus 0.50 0.83 0.57
Loading (Ib/ac/yr)
5.0 Seasonal High Water Table
Soil & Environmental Consultants, PA (S&EC) evaluated the seasonal high water table (SHWT)
at the proposed SCM locations. Their report is included in Appendix P. Based on the report, the
stormwater wetland permanent pool is not anticipated to be within six inches of the SHWT and
thus, a clay or other liner will be required.
6.0 Limitations
This work was performed in a manner consistent with the level of care and skill ordinarily
exercised by other members of FLM Engineering's (FLM) profession practicing in the same
locality, and under similar conditions, as of the date any services were provided. FLM's opinions
and recommendations were necessarily based on a limited number of data and observations. It
is possible that actual conditions could vary beyond the data evaluated. Therefore, FLM makes
©2024 FLM Engineering, Inc. Page 5 of 6 August 26, 2024

no guarantee or warranty, express or implied, regarding any services, communications, reports,
opinions, or instruments of service provided.
©2024 FLM Engineering, Inc. Page 6 of 6 August 26, 2024

APPENDIX A
FEMA FIRM MAP

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MAP NUMBER
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APPENDIX B
USGS MAP EXCERPT

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APPENDIX C
SOILS MAP EXCERPT

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APPENDIX D
NRCS SOIL REPORT

USDA United States A product of the National Custom Soil Resource
Department of Cooperative Soil Survey,
Agriculture a joint effort of the United Report for
N RC(' States Department of
J Agiculureandothr F ra n k I i n County Federal agencies, State
Naturalagencies including the North Carolina
Resources Agricultural Experiment
Conservation Stations, and local
Service participants College St Townhomes
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August 27, 2024

Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs)or your NRCS State Soil
Scientist(http://www.nres.usda.gov/wps/portal/nres/detail/soils/contactus/?
cid=nrcs142p2_053951).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
Information about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2

alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at [phone] (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 Independence Avenue, S.W., Washington, D.C. 20250-9410 or
call [phone] (voice)or(202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3

Contents
Preface 2
How Soil Surveys Are Made 5
Soil Map 8
Soil Map 9
Legend 10
Map Unit Legend 11
Map Unit Descriptions 11
Franklin County, North Carolina 13
CaB—Cecil sandy loam, 2 to 6 percent slopes 13
CeB2—Cecil clay loam, 2 to 6 percent slopes, moderately eroded 14
HeB—Helena sandy loam, 2 to 6 percent slopes 15
PuC—Pacolet-Urban land complex, 2 to 10 percent slopes 17
W—Water 18
WaB—Wake-Saw-Wedowee complex, 2 to 8 percent slopes, rocky 18
WbD—Wake-Wateree-Wedowee complex, 8 to 15 percent slopes, rocky 21
WeC—Wedowee sandy loam, 6 to 10 percent slopes 24
Soil Information for All Uses 26
Soil Properties and Qualities 26
Soil Qualities and Features 26
Hydrologic Soil Group 26
References 31
4

How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock. They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006). Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils. They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries.
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically. Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5

Custom Soil Resource Report
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. Interpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
6

Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
7

Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
8

Custom Soil Resource Report
N Soil Map a
N N
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FN Map Scale:1:7,320 if printed on A landscape(11"x 8.5")sheet.
Meters N
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Map projection:Web Mercator Coer coordinates:WG584 Edge tics:UTM Zone 17N WG584
9

Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) 14 Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
Q Stony Spot
Soilsit Very Stony Spot
Soil Map Unit Polygons Warning:Soil Map may not be valid at this scale.
Wet Spot
,..,. Soil Map Unit Lines Enlargement of maps beyond the scale of mapping can cause
p Other misunderstandingof the detail of mapping and accuracyof soil
p Soil Map Unit Points pp 9
.• Special Line Features line placement.The maps do not show the small areas of
Special Point Features contrasting soils that could have been shown at a more detailed
Blowout Water Features scale.
-_- Streams and Canals
kg Borrow Pit
Transportation Please rely on the bar scale on each map sheet for map
* clay Spot 1.44 Rails measurements.
0 Closed Depression
o,/ Interstate Highways
Gravel Pit Source of Map: Natural Resources Conservation Service
.r US Routes Web Soil Survey URL:
Gravelly Spot Major Roads Coordinate System: Web Mercator(EPSG:3857)
® Landfill Local Roads Maps from the Web Soil Survey are based on the Web Mercator
• Lava Flow Background projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
46 Marsh or swamp Aerial Photography Albers equal-area conic projection,should be used if more
It Mine or Quarry accurate calculations of distance or area are required.
4 Miscellaneous Water This product is generated from the USDA-NRCS certified data as
O Perennial Water of the version date(s)listed below.
v Rock Outcrop Soil Survey Area: Franklin County,North Carolina
+ Saline Spot Survey Area Data: Version 27,Sep 13,2023
Sandy Spot Soil map units are labeled(as space allows)for map scales
Severely Eroded Spot 1:50,000 or larger.
• Sinkhole Date(s)aerial images were photographed: Apr 25,2022—May
31 Slide or Slip 20,2022
oa Sodic Spot The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
shifting of map unit boundaries may be evident.
10

Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
CaB Cecil sandy loam,2 to 6 5.5 2.6%
percent slopes
CeB2 Cecil clay loam,2 to 6 percent 49.3 23.0%
slopes,moderately eroded
HeB Helena sandy loam,2 to 6 8.8 4.1
percent slopes
PuC Pacolet-Urban land complex,2 68.5 31.9%
to 10 percent slopes
W Water 1.9 0.9%
WaB Wake-Saw-Wedowee complex, 0.4 0.2%
2 to 8 percent slopes, rocky
WbD Wake-Wateree-Wedowee 4.8 2.2%
complex,8 to 15 percent
slopes,rocky
WeC Wedowee sandy loam,6 to 10 75.1 35.1
percent slopes
Totals for Area of Interest 214.4 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
11

Custom Soil Resource Report
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. If intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a soil series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into soil phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An association is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
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Custom Soil Resource Report
Franklin County, North Carolina
CaB—Cecil sandy loam, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 2spnw
Elevation: 70 to 1,400 feet
Mean annual precipitation: 39 to 47 inches
Mean annual air temperature: 55 to 63 degrees F
Frost-free period: 200 to 250 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Cecil and similar soils: 95 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cecil
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or saprolite derived
from schist
Typical profile
Ap- 0 to 8 inches: sandy loam
Bt- 8 to 42 inches: clay
BC-42 to 50 inches: clay loam
C- 50 to 80 inches: loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 7.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: A
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
Minor Components
Pacolet, moderately eroded
Percent of map unit: 5 percent
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Custom Soil Resource Report
Landform: Interfluves
Landform position (two-dimensional): Summit, shoulder
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
CeB2—Cecil clay loam, 2 to 6 percent slopes, moderately eroded
Map Unit Setting
National map unit symbol: 3s4v
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Cecil, moderately eroded, and similar soils: 80 percent
Minor components: 5 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Cecil, Moderately Eroded
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 8 inches: clay loam
Bt- 8 to 48 inches: clay
BC-48 to 58 inches: clay loam
C- 58 to 80 inches: sandy loam
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 8.3 inches)
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Custom Soil Resource Report
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: B
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
Minor Components
Lloyd, moderately eroded
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
HeB—Helena sandy loam, 2 to 6 percent slopes
Map Unit Setting
National map unit symbol: 3s55
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Helena and similar soils: 90 percent
Minor components: 9 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Helena
Setting
Landform: Ridges
Landform position (two-dimensional): Summit, footslope
Landform position (three-dimensional): Interfluve
Down-slope shape: Concave
Across-slope shape: Concave
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 8 inches: sandy loam
E- 8 to 12 inches: sandy loam
Bt- 12 to 39 inches: clay
BC-39 to 46 inches: clay loam
C-46 to 80 inches: coarse sandy loam
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Custom Soil Resource Report
Properties and qualities
Slope: 2 to 6 percent
Depth to restrictive feature: More than 80 inches
Drainage class: Moderately well drained
Runoff class: Low
Capacity of the most limiting layer to transmit water(Ksat): Moderately low to
moderately high (0.06 to 0.20 in/hr)
Depth to water table:About 18 to 30 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 7.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: D
Ecological site: F136XY810SC-Acidic upland forest, seasonally wet
Hydric soil rating: No
Minor Components
Vance
Percent of map unit: 5 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
Wedowee
Percent of map unit: 3 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
Worsham, undrained
Percent of map unit: 1 percent
Landform: Depressions
Landform position (two-dimensional): Footslope
Down-slope shape: Concave
Across-slope shape: Concave
Hydric soil rating: Yes
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Custom Soil Resource Report
PuC—Pacolet-Urban land complex, 2 to 10 percent slopes
Map Unit Setting
National map unit symbol: 3s5c
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Pacolet and similar soils: 55 percent
Urban land: 35 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Pacolet
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap-0 to 8 inches: sandy loam
Bt- 8 to 27 inches: clay
BC-27 to 35 inches: clay loam
C-35 to 80 inches: sandy clay loam
Properties and qualities
Slope: 2 to 10 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 7.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
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Custom Soil Resource Report
Description of Urban Land
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Impervious layers over human transported material
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8
Hydric soil rating: No
W—Water
Map Unit Composition
Water: 100 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Water
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 8
Hydric soil rating: No
WaB—Wake-Saw-Wedowee complex, 2 to 8 percent slopes, rocky
Map Unit Setting
National map unit symbol: 3s5z
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 59 to 66 degrees F
Frost-free period: 200 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Wake, rocky, and similar soils: 35 percent
Saw, rocky, and similar soils: 30 percent
Wedowee, rocky, and similar soils: 20 percent
Minor components: 15 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
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Custom Soil Resource Report
Description of Wake, Rocky
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from granite and gneiss
Typical profile
A -0 to 7 inches: gravelly loamy coarse sand
C- 7 to 11 inches: gravelly loamy sand
R- 11 to 80 inches: unweathered bedrock
Properties and qualities
Slope: 2 to 8 percent
Depth to restrictive feature: 8 to 20 inches to lithic bedrock
Drainage class: Excessively drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water(Ksat):Very low to low (0.00 to
0.01 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Very low(about 0.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4s
Hydrologic Soil Group: D
Ecological site: F136XY870GA- Lower piedmont acidic upland woodland, depth
restriction, dry
Hydric soil rating: No
Description of Saw, Rocky
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from granite and gneiss
Typical profile
Ap- 0 to 8 inches: sandy loam
Bt- 8 to 20 inches: clay
BC-20 to 26 inches: sandy clay loam
C-26 to 29 inches: sandy loam
R-29 to 80 inches: unweathered bedrock
Properties and qualities
Slope: 2 to 8 percent
Depth to restrictive feature: 20 to 40 inches to lithic bedrock
Drainage class:Well drained
Runoff class: Very high
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Custom Soil Resource Report
Capacity of the most limiting layer to transmit water(Ksat):Very low to low (0.00 to
0.01 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Low(about 3.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: C
Ecological site: F136XY830NC -Acidic upland forest, depth restriction, dry-moist
Hydric soil rating: No
Description of Wedowee, Rocky
Setting
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 5 inches: sandy loam
BE-5 to 10 inches: sandy clay loam
Bt- 10 to 35 inches: sandy clay
C-35 to 80 inches: sandy clay loam
Properties and qualities
Slope: 2 to 8 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 8.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: B
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
Minor Components
Rion, rocky
Percent of map unit: 8 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
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Custom Soil Resource Report
Across-slope shape: Convex
Hydric soil rating: No
Wateree, rocky
Percent of map unit: 6 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
Rock outcrop
Percent of map unit: 1 percent
Landform: Interfluves
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Hydric soil rating: No
WbD—Wake-Wateree-Wedowee complex, 8 to 15 percent slopes, rocky
Map Unit Setting
National map unit symbol: 3s60
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 50 to 66 degrees F
Frost-free period: 160 to 240 days
Farmland classification: Not prime farmland
Map Unit Composition
Wake, rocky, and similar soils: 35 percent
Wateree, rocky, and similar soils: 30 percent
Wedowee, rocky, and similar soils: 25 percent
Minor components: 10 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Wake, Rocky
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Residuum weathered from granite and gneiss
21

Custom Soil Resource Report
Typical profile
A -0 to 7 inches: gravelly loamy coarse sand
C- 7 to 11 inches: gravelly loamy sand
R- 11 to 80 inches: unweathered bedrock
Properties and qualities
Slope: 8 to 15 percent
Depth to restrictive feature: 8 to 20 inches to lithic bedrock
Drainage class: Excessively drained
Runoff class: Very high
Capacity of the most limiting layer to transmit water(Ksat):Very low to low (0.00 to
0.01 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Very low(about 0.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 6s
Hydrologic Soil Group: D
Ecological site: F136XY870GA- Lower piedmont acidic upland woodland, depth
restriction, dry
Hydric soil rating: No
Description of Wateree, Rocky
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss
Typical profile
A -0 to 7 inches: sandy loam
Bw- 7 to 28 inches: sandy loam
C-28 to 35 inches: sandy loam
Cr-35 to 80 inches: weathered bedrock
Properties and qualities
Slope: 8 to 15 percent
Depth to restrictive feature: 20 to 40 inches to paralithic bedrock
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat):Very low to high (0.00
to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Low(about 3.4 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
22

Custom Soil Resource Report
Ecological site: F136XY870GA- Lower piedmont acidic upland woodland, depth
restriction, dry
Hydric soil rating: No
Description of Wedowee, Rocky
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 5 inches: sandy loam
BE-5 to 10 inches: sandy clay loam
Bt- 10 to 35 inches: sandy clay
C-35 to 80 inches: sandy clay loam
Properties and qualities
Slope: 8 to 15 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 8.2 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
Minor Components
Rion, rocky
Percent of map unit: 6 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
Wilkes, rocky
Percent of map unit: 3 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
23

Custom Soil Resource Report
Hydric soil rating: No
Rock outcrop
Percent of map unit: 1 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
WeC—Wedowee sandy loam, 6 to 10 percent slopes
Map Unit Setting
National map unit symbol: 3s64
Elevation: 200 to 1,400 feet
Mean annual precipitation: 37 to 60 inches
Mean annual air temperature: 50 to 66 degrees F
Frost-free period: 160 to 240 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Wedowee and similar soils: 85 percent
Minor components: 14 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Wedowee
Setting
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Parent material: Saprolite derived from granite and gneiss and/or schist
Typical profile
Ap- 0 to 4 inches: sandy loam
E-4 to 7 inches: sandy loam
Bt- 7 to 23 inches: clay
BC-23 to 35 inches: clay loam
C-35 to 80 inches: sandy clay loam
Properties and qualities
Slope: 6 to 10 percent
Depth to restrictive feature: More than 80 inches
Drainage class:Well drained
Runoff class: Medium
24

Custom Soil Resource Report
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to high
(0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water supply, 0 to 60 inches: Moderate (about 8.1 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Ecological site: F136XY820GA-Acidic upland forest, moist
Hydric soil rating: No
Minor Components
Rion
Percent of map unit: 8 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
Vance
Percent of map unit: 5 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
Wateree
Percent of map unit: 1 percent
Landform: Hillslopes on ridges
Landform position (two-dimensional): Backslope
Landform position (three-dimensional): Side slope
Down-slope shape: Linear
Across-slope shape: Convex
Hydric soil rating: No
25

Soil Information for All Uses
Soil Properties and Qualities
The Soil Properties and Qualities section includes various soil properties and
qualities displayed as thematic maps with a summary table for the soil map units in
the selected area of interest. A single value or rating for each map unit is generated
by aggregating the interpretive ratings of individual map unit components. This
aggregation process is defined for each property or quality.
Soil Qualities and Features
Soil qualities are behavior and performance attributes that are not directly
measured, but are inferred from observations of dynamic conditions and from soil
properties. Example soil qualities include natural drainage, and frost action. Soil
features are attributes that are not directly part of the soil. Example soil features
include slope and depth to restrictive layer. These features can greatly impact the
use and management of the soil.
Hydrologic Soil Group
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.
26

Custom Soil Resource Report
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.
27

Custom Soil Resource Report
N Map—Hydrologic Soil Group a
N N
728300 728400 728500 728600 728700 728800 728900 729000 729100 729200 729300 7294W 729500 M852) 729700 729300
14/1t- 4.: 41010 14'
4F, y
+.). `� pub' ` , ~N .• ©Collegs St ...
--,-..., ' -, e)'N- ' ' ly„ tip,
S2 Qiii
�mt _ CeB2
-, .,, ,,./
` 1M-r
. r _ �. _ _ N
t ,r : V -tea ,� �
,HeB ,=
�: CaB CeB2 _ y y.� %
ze/ei ,
, 4- . / .4- -/,,,
•
t1111.4. .„. .
/r _ - -. . WbD WaB
/ �,
i 1 `, . 'r. .
8 �00 G ap tea-mica bQ ea0od WO�c�aOQ. tov..
36°5'29"N ! 36°5'29"N
728400 728500 728600 72870 72880 728900 rz9.7.J0 72910 729200 72930 72940 729500 729600 72970 729800 7299W
3 3
FN Map Scale:1:7,320 if printed on A landscape(11"x 8.5")sheet.
Meters N
N 0 100 200 400 600 m
Feet
0 350 700 m 1400 2100
Map projection:Web Mercator Coer coordinates:WG584 Edge tics:UTM Zone 17N WG584
28

Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
Area of Interest(AOI) 0 C The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) CID 1:24,000.
Soils D
Soil Rating Polygons Warning:Soil Map may not be valid at this scale.
A 0 Not rated or not available
Enlargement of maps beyond the scale of mapping can cause
I Water Features
A/D misunderstanding of the detail of mapping and accuracy of soil
Streams and Canals line placement.The maps do not show the small areas of
I I B
Transportation contrasting soils that could have been shown at a more detailed
I B/D scale.
1-FF Rails
I C
^,/ Interstate Highways
C/D Please rely on the bar scale on each map sheet for map
~iv US Routes measurements.
D Major Roads
Not rated or not available Source of Map: Natural Resources Conservation Service
Local Roads Web Soil Survey URL:
Soil Rating Lines Background Coordinate System: Web Mercator(EPSG:3857)
• Ael Aerial Photography
Maps from the Web Soil Survey are based on the Web Mercator
. • A/D projection,which preserves direction and shape but distorts
• B distance and area.A projection that preserves area,such as the
Albers equal-area conic projection,should be used if more
....we B/D accurate calculations of distance or area are required.
✓ w c
This product is generated from the USDA-NRCS certified data as
• r C/D of the version date(s)listed below.
. r D
Soil Survey Area: Franklin County,North Carolina
. • Not rated or not available Survey Area Data: Version 27,Sep 13,2023
Soil Rating Points
A Soil map units are labeled(as space allows)for map scales
1:50,000 or larger.
▪ A/D
▪ B Date(s)aerial images were photographed: Apr 25,2022—May
20,2022
▪ B/D
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
shifting of map unit boundaries may be evident.
29

Custom Soil Resource Report
Table—Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
CaB Cecil sandy loam,2 to 6 A 5.5 2.6%
percent slopes
CeB2 Cecil clay loam,2 to 6 B 49.3 23.0%
percent slopes,
moderately eroded
HeB Helena sandy loam,2 to D 8.8 4.1
6 percent slopes
PuC Pacolet-Urban land B 68.5 31.9%
complex,2 to 10
percent slopes
W Water 1.9 0.9%
WaB Wake-Saw-Wedowee D 0.4 0.2%
complex,2 to 8
percent slopes,rocky
WbD Wake-Wateree- B 4.8 2.2%
Wedowee complex,8
to 15 percent slopes,
rocky
WeC Wedowee sandy loam,6 B 75.1 35.1
to 10 percent slopes
Totals for Area of Interest 214.4 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff.None Specified
Tie-break Rule: Higher
30

References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/31.
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18, 2002. Hydric soils of the United States.
Hurt, G.W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
Soil Survey Division Staff. 1993. Soil survey manual. Soil Conservation Service.
U.S. Department of Agriculture Handbook 18. http://www.nres.usda.gov/wps/portal/
nres/detail/national/soils/?cid=nres 142p2_054262
Soil Survey Staff. 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soil surveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053577
Soil Survey Staff. 2010. Keys to soil taxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http://
www.nres.usda.gov/wps/portal/nres/detail/national/soils/?cid=nres142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Waterways Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
home/?cid=nres142p2_053374
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nres.usda.gov/wps/portal/nres/
detail/national/landuse/rangepasture/?cid=stelprdb1043084
31

Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-VI. http://www.nres.usda.gov/wps/portal/
nres/detail/soils/scientists/?cid=nres142p2_054242
United States Department of Agriculture, Natural Resources Conservation Service.
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http://www.nres.usda.gov/wps/portal/nres/detail/national/soils/?
cid=nres142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961. Land
capability classification. U.S. Department of Agriculture Handbook 210. http://
www.nrcs.usda.gov/Internet/FSE_DOCUMENTS/nrcs142p2_052290.pdf
32

APPENDIX E
NOAA RAINFALL DATA

NOAA Atlas 14,Volume 2,Version 3
`''`*`°`°w,F Location name: Franklinton,North Carolina, USA* ''''''
i X 1.. Latitude:36.0964°,Longitude: -78.4535° Anon
Elevation:361 ft** an a
•\ • *source:ESRI Maps les
`�
°'""`t- **source:USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spring,Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval(years)
Duration
1 2 5 10 25 50 100 200 500 1000
5-min 0.406 0.473 0.541 0.605 0.671 0.722 0.767 0.807 0.851 0.889
(0.375-0.441),(0.436-0.514) (0.498-0.586) (0.556-0.656) (0.614-0.727) (0.657-0.782) (0.695-0.831) (0.725-0.877) (0.759-0.926) (0.787-0.968)
10-min 0.648 0.756 0.866 0.968 1.07 1.15 1.22 1.28 1.35 1.40
(0.599-0.704) (0.698-0.822) (0.798-0.939) (0.890-1.05) (0.978-1.16) (1.05-1.25) (1.10-1.32) (1.15-1.39) (1.20-1.46) (1.24-1.52)
15-min 0.810 0.951 1.10 1.22 1.36 1.46 1.54 1.61 1.70 1.76
(0.749-0.880) (0.877-1.03) (1.01-1.19) (1.13-1.33) (1.24-1.47) (1.32-1.58) (1.40-1.67) (1.45-1.75) (1.51-1.84) (1.56-1.91)
30-min 1.11 1.31 1.56 1.77 2.01 2.19 2.36 2.51 2.70 2.84
(1.03-1.21) (1.21-1.43) (1.43-1.69) (1.63-1.92) (1.84-2.18) (2.00-2.38) (2.14-2.56) (2.26-2.73) (2.41-2.93) (2.52-3.10)
60-min 1.38 1.65 2.00 2.31 2.68 2.97 3.25 3.52 3.87 4.15
(1.28-1.50) (1.52-1.79) (1.84-2.16) (2.12-2.50) (2.45-2.90) (2.70-3.22) (2.94-3.52) (3.17-3.83) (3.45-4.21) (3.68-4.52)
2-hr 1.63 1.95 2.38 2.78 3.26 3.68 4.08 4.48 5.00 I 5.45
(1.50-1.78) (1.79-2.12) (2.18-2.60)_ (2.54-3.03) (2.96-3.55) (3.32-4.00) (3.65-4.43) (3.98-4.86) (4.40-5.44) (4.76-5.94)
3-hr 1.73 2.07 2.54 2.99 3.54 4.02 4.50 5.00 5.66 6.25
(1.58-1.91) (1.89-2.28) (2.32-2.80) (2.72-3.28) (3.20-3.89) (3.61-4.41) (4.00-4.93) (4.41-5.47) (4.94-6.19) (5.39-6.86)
6-hr 2.08 2.48 3.04 3.59 4.27 4.88 5.48 6.12 I 6.97 7.74
(1.89-2.30) (2.26-2.74) (2.77-3.36) i (3.26-3.96) (3.85-4.69) (4.37-5.35) (4.87-6.01) (5.38-6.69) (6.05-7.62) (6.62-8.48)
12-hr 2.44 2.92 3.61 4.27 5.12 5.89 6.66 7.49 8.63 9.66
(2.25-2.69) (2.69-3.21) (3.31-3.97) (3.90-4.69) (4.65-5.61) (5.30-6.42) (5.93-7.26) (6.60-8.15) (7.48-9.40) (8.26-10.5)
24-hr 2.88 3.48 4.36 5.05 5.98 6.72 7.49 8.27 9.35 10.2
(2.69-3.10) (3.25-3.74) (4.07-4.68) (4.70-5.41) (5.56-6.41) (6.23-7.22) (6.91-8.04) (7.60-8.89) (8.56-10.1) (9.29-11.0)
2-day 3.35 4.03 5.01 5.77 6.80 7.61 8.43 9.28 10.4 11.4
(3.13-3.59) (3.78-4.32) (4.68-5.36L (5.38-6.18) (6.32-7.28) (7.05-8.15) (7.79-9.04) (8.55-9.97) (9.55-11.2) (10.3-12.3)
3-day 3.55 4.26 5.27 6.06 7.13 7.98 8.84 9.74 11.0 11.9
(3.32-3.79) (3.99-4.56) (4.93-5.63) (5.66-6.48) (6.64-7.63) (7.40-8.54) (8.18-9.47) (8.97-10.4) (10.0-11.8) (10.9-12.8)
4-day 3.75 4.49 5.53 6.35 7.47 8.36 9.26 10.2 11.5 12.5
(3.51-4.00) (4.21-4.79) (5.17-5.90) (5.93-6.78) (6.95-7.97) (7.76-8.93) (8.57-9.90)i (9.39-10.9) (10.5-12.3) (11.4-13.4)
7-day 4.34 5.18 6.30 7.19 8.40 9.37 10.4 11.4 12.8 13.9
(4.08-4.64) (4.86-5.53) (5.91-6.73) (6.73-7.68) (7.84-8.97) (8.71-10.0) (9.60-11.1) (10.5-12.2) (11.7-13.7) (12.7-14.9)
-
10-day 4.94 5.88 7.07 8.00 9.26 10.2 11.2 12.3 13.6 14.7
(4.64-5.27) (5.52-6.26) (6.63-7.52) (7.50-8.52) (8.65-9.86) (9.55-10.9) (10.4-12.0) (11.4-13.1) (12.6-14.6) (13.5-15.8)
20-day 6.62 7.81 9.23 10.4 11.9 13.1 14.3 15.5 17.2 18.5
(6.25-7.01) (7.38-8.27) (8.71-9.77) (9.77-11.0) (11.2-12.6) (12.3-13.9) (13.4-15.2) (14.5-16.5) (15.9-18.4) (17.1-19.8)
30-day 8.21 9.66 11.2 12.5 14.1 15.3 16.5 17.8 19.4 20.7
(7.77-8.68) (9.14-10.2) (10.6-11.9) (11.8-13.1) (13.3-14.9) (14.4-16.2) (15.5-17.5) (16.6-18.8) (18.1-20.6) (19.2-22.0)
45-day 10.4 12.2 14.0 15.4 17.1 18.5 19.8 21.1 22.9 24.2
(9.93-11.0) (11.6-12.8) (13.3-14.7) (14.6-16.1) (16.2-18.0) (17.5-19.5) (18.7-20.9) (19.9-22.3) (21.4-24.2) (22.6-25.6)
60-day 12.5 14.6 16.5 18.0 19.9 21.3 22.6 24.0 25.7 27.0
(12.0-13.2) (13.9-15.3) (15.7-17.3) (17.1-18.9) (18.9-20.8) (20.2-22.4) (21.4-23.8) I (22.7-25.3) (24.2-27.1) (25.4-28.5)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not
checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAAAtlas 14 document for more information.
Back to Top
PF graphical

PDS-based depth-duration-frequency (DDF) curves
Latitude: 36.0964', Longitude: -78.4535`
I Average recurrence
25 - interval
(years)
S 20 - . . 2
-c
o. — 5
N
13 15 - , — 10
o // — 25
ru — 50
a 10 - '�� — # !0
1:11111
0 •
f 1 (- - Ili 1 f I 1 I 1 1 f f 1 i
•E E E E E N A 6 N a ro �77 -0 7 7 77
41 :ES4 . m n N N n5 4 r o 0 0 ,n o
Duration ,.., N n, v
25 -
c 20 l_ ,
Duration
s
o.
tv _...d1111111111111_. — 5-imn — 2-day
v 15
c � I
4.4
111
10I. 30-nin — 7-day
- IIIII—�1.1—� — 60-min — 10 day
o_ _ — 2fir — 20-clay
- 3-hr 30-day
— 6-hr — 45-day
0 - 1 — 12-hr — 60-day
, — 24-hr
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT) Fri May 17 14:16:05 2024
Back to Top
Maps & aerials
Small scale terrain

Franklinton•
3km
2mi i
Large scale terrain
• Lynchburg 0•
;burg 6 Roanoke
N orfol
.5 al ern 0
• • Durham Rocky Mount
Greensboro •
Ra'eigh •
NI` •
ffl CAROLINA Greenvi +
1'
0 -
harl 100km
60mi Jackson
Large scale map
I mi
Norfoll
&Wive lem Greensboro
o Dtelj
Rocky Mount
72ateigh
North reenvill
Carolina
adotte
100km 'aYetteviile
60mi Jacksonville
Large scale aerial

Iladcsburg Roanoke
•
N orf olk
stun-Salem
•
Greensboro Durham , Rocky Mount
•
Raleigh
Greenvillf
North
Carolina
3rlotte
100km ayetteville •
r
60mi Jacksonville •
Back to Top
US Department of Commerce
National Oceanic and Atmospheric Administration
National Weather Service
National Water Center
1325 East West Highway
Silver Spring,MD 20910
Questions?:HDSC.Questions(cilnoaa.gov
Disclaimer

APPENDIX F
PRE-DEVELOPMENT WATERSHED MAP

LEGEND SOIL TYPES
ri
EX.PROPERTY LINE CeB2 CECIL CLAY LOAM,2 TO 6 PERCENT SLOPES,MODERATELY ERODED HSG B
EX.RIGHT-OF-WAY HeB HELENA SANDY LOAM,2 TO 6 PERCENT SLOPES HSG D
EX.ADJACENT OWNERS M
EX.EASEMENT PuC PACOLET-URBAN LAND COMPLEX,2 TO 10 PERCENT SLOPES HSG B
—400— EX.MAJOR CONTOUR(10') WeC WEDOWEE SANDY LOAM,6 TO 10 PERCENT SLOPES HSG B ENGINEERING
EX.MINOR CONTOUR(2')
EX.STREAM
POST OFFICE BOX 91727
EX.STREAM BUFFER RALEIGH,NORTH CAROLINA 27675
PHONE:[phone]
EX.SOIL LINE FIRM NC LICENSE NUMBER C-4222
OHW OHW EX.OVERHEAD ELECTRIC LINE
SD SD EX.STORM SEWER
W W EX.WATER LINE
EX.SANITARY SEWER
PRE-DEVELOPMENT DRAINAGE AREA BOUNDARY
————— PRE-DEVELOPMENT TIME OF CONCENTRATION FLOW PATH
ti N -� ..�
f 4 . ,r+"
1 4110 , .... i
14 ilit _
, ,
_ R1rH �� , - \ -1 REVISION HISTORY
I
1 — ,f WOW*� �III R#V DESCRIPTION DATE BY
• akr
I
A el#11-
<,• I q II P is
r _ q
Y-
• • - - q I - SITE AREA EAST OF STREAM
SHALL NOT BE DEVELOPED AND
i PuC ..- - I THUS,WAS NOT INCLUDED IN
•
_ - • � �1 PRE-DEVELOPMENT ANALYSIS
0 �
IYI
r a
I
1. \ . • -
r---------------__.
- I ORIGINAL PLAN SIZE 24"X 36"
`\ - i i�
Co
- - ���—S '
•
......._...... - i �'i
- Q
..._.____._t...._
3,,0 # n
- a _
.,..
,.
i n
(,)
.3
, , .
• - ! 1\ y _.,
100 50 0 100
' 'f DA-1 Tc FLOW —--� '/ _ ��
SEGMENT 4 t m _ ® _ SCALE:1 INCH=100 FEET
•� 1S(PRE-DEVELOPMENT -
DA-1)DRAINAGE ® N SCALE ADJUSTMENT
AREA=59.S01 ACRES _ - SE I51INCH IN LENGT
H
��- - ON ORIGINAL DRAWING
IS
t W"' iaii j SHEET,ADJUST VOUR SCALE
i # WeC
ACCORDINGLY
1111611111111141111 it
EXHIBIT
I - - — COLLEGE STREET TOWNHOMES
do .a4-
CeB2 s le 1, FRANKLINTON,NC
a1
vim
I _41
C •
90
i f a.
3:0 - DATE: 08/27/2024
_„ ® ® SCALE: AS SHOWN
_
—_ ., I
I DESIGNED BY: FLM
APPROVED BY: FLM
, .4\T--
- — ( PROJECT NO.: 24024
PRE-DEVELOPMENT
•
WATERSHED MAP
' POINT OF
ANALYSIS
F
SHEET 1 OF 1
02024 THIS DRAWING SHALL NOT BE REPRODUCED IN WHOLE OR IN
PART WITHOUT WRITTEN PERMISSION OF FLM ENGINEERING,INC.

APPENDIX G
PRE-DEVELOPMENT HYDROLOGIC MODEL

Pre-development D
Subcat Reach 'on. Link Drainage Diagram for College St_Stormwater Management
Prepared by FLM Engineering, Inc., Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC

College St_Stormwater Management
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 2
Area Listing (selected nodes)
Area CN Description
(acres) (subcatchment-numbers)
7.450 55 Woods, Good, HSG B (offsite) (1S)
14.051 55 Woods, Good, HSG B (onsite) (1S)
29.263 61 >75% Grass cover, Good, HSG B (offsite) (1S)
1.433 77 Woods, Good, HSG D (onsite) (1S)
7.604 98 Paved parking & roofs (offsite) (1S)
59.801 TOTAL AREA

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 1S: Pre-development DA-1
Runoff = 30.38 cfs @ 12.03 hrs, Volume= 2.080 af, Depth= 0.42"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-Year Rainfall=2.88"
Area (ac) CN Description
* 7.604 98 Paved parking & roofs (offsite)
* 29.263 61 >75% Grass cover, Good, HSG B (offsite)
* 7.450 55 Woods, Good, HSG B (offsite)
* 1.433 77 Woods, Good, HSG D (onsite)
* 14.051 55 Woods, Good, HSG B (onsite) _
59.801 64 Weighted Average
52.197 Pervious Area
7.604 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 100 0.0400 1.89 Sheet Flow, Sheet Flow
Smooth surfaces n= 0.011 P2= 3.46"
4.5 977 0.0510 3.64 Shallow Concentrated Flow, Shallow Concentrated Flow
Unpaved Kv= 16.1 fps
3.2 1,430 0.0224 7.37 117.87 Channel Flow, Channel Flow
Area= 16.0 sf Perim= 14.0' r= 1.14'
n= 0.033 Winding stream, pools & shoals
8.6 2,507 Total

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 4
Subcatchment 1 S: Pre-development DA-1
Hydrograph
34:
32_ 30.38 cfs —Runoff
30: ± 5 1 1 ± 11Hfi
28: ype II-24 hr1-Year
26: —1 4 — 4 —1 4 — I— 1 1 R i t ailt12 8
24: T Iturkoif rra §AOaT--a6_
22:
in-
20: f fi �n�unOff VollVol =12�08O a1
6 18:
0 16 —1 T 4 Rur ff-PepthO.427
LL 14:-
12 FIQWI r gtill=?Mr-
10 Tfi 55 —ht —tI- 1 1tT1c-78-1691iP-
8
4
21
o i..,.i.,.,i.,.,i....i....i,.,.i..,.i.,.,i.,.,i,.., ,.,.i,.,.i.,,.i.,.,i....i,..,i,. .i,
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

APPENDIX H
POST-DEVELOPMENT WATERSHED MAP

LEGEND SOIL TYPES
EX.PROPERTY LINE - - PROP.RIGHT-OF-WAYri
CeB2 CECIL CLAY LOAM,2 TO 6 PERCENT SLOPES,MODERATELY ERODED HSG B
EX.RIGHT-OF-WAY PROP.LOT LINES HeB HELENA SANDY LOAM,2 TO 6 PERCENT SLOPES HSG D
EX.ADJACENT OWNERS PROP.SETBACK LINE M
EX.EASEMENT PROP.EASEMENT PuC PACOLET-URBAN LAND COMPLEX,2 TO 10 PERCENT SLOPES HSG B
-400- EX.MAJOR CONTOUR(10') 400 PROP.MAJOR CONTOUR(5') WeC WEDOWEE SANDY LOAM,6 TO 10 PERCENT SLOPES HSG B ENGINEERING
EX.MINOR CONTOUR(2') PROP.MINOR CONTOUR(1')
EX.STREAM ol POST-DEVELOPMENT DRAINAGE AREA BOUNDARY POST OFFICE BOX 91727
EX.STREAM BUFFER ——— POST-DEVELOPMENT TIME OF CONCENTRATION FLOW PATH RALEIGH,NORTH CAROLINA 27675
PHONE:[phone]
EX.SOIL LINE FIRM NC LICENSE NUMBER C-4222
OH W OHW EX.OVERHEAD ELECTRIC LINE
SD SD EX.STORM SEWER
W W EX.WATER LINE
EX.SANITARY SEWER
;� ,( ` '-
al
1jrH r -- = -T— REVISION HISTORY
•
•
\ _ REV DESCRIPTION DATE BY
\ ', 1 -----_______-----__
I \ _
\ I ,A..
. ,
/, tiJL �y ,(. _ ,
I e1
. • . _ ,\
A10 tl I
_-- 400 •- , ` AA
!. ��� SHALL NOT BE DEVELOP D AND
- PuC THUS,WAS NOT INCLUDED IN
!�\ \\\\ PRE-DEVELOPMENT ANALYSIS
\ 90
�- ,, _ - 2S(POST-DEVELOPMENT I __ 11 -
I
BYPASS DA-1 B)DRAINAGE 1� - - - - - '
j- • AREA=51.251 ACRES 1
•_ \ I
4 ORIGINAL PLAN SIZE:24"X 36"
eo WeC m s
+ _ ��\ - - - it
11 a>o 10 li }t C�
1
ri__. . ,
1
INC111.114111- lit° \'‘r-- ;
'DA-1B Tc FLOW1 4 '' - \.. 111 .......,....... i r (.1)
�ii'�� 1 0 100 50 0 100 wm
SEGMENT �. � M SCALE:1 INCH=100 FEET
[ \\''�- 1IS !I11I/L'II//,
PI ONORIGINALDRAWG
78n_ 77IF ITiIS NOT IINCH ON THIS
_ — ---� i � SHEET,ADJUST YOUR SCALE
•; \ _� -0s�,������ ACCORDINGLY
's+Gi7z7 z3 :psi A EXHIBIT
/ I r. /- •
2s(Post-DEVELoIi363/i !41
r rr COLLEGE STREET TOWNHOMES
• I --._ TO SCM DA-1 A)DRAINAGE II
•
AREA=3ssACREs FRANKLINTON,NC
_.
Ce82 Pliiii F-5.--irs
53 4siiiIi
47I I Ii ( PROPOSED STORM WATER
-- li
• ���_- It WETLAND#1 -?_��,;`_-� ^yam --_^o---__/ass1 1 I
, \
z
76i4 pr 9irIiiI oF --10 , 59i . i I� 69 70 7"72 73��� I ipi
'! III / m DATE: 08/27/2024
1
i ® 1 SCALE: AS SHOWN
I I I' j -- DESIGNED BY: FLM
sea I APPROVED BY: FLM
.\_______
.•
36 PROJECT NO.: 24024
_ POST-DEVELOPMENT
WATERSHED MAP
POINT OF '
ANALYSIS -
H
SHEET 1 OF 1
02024 THIS DRAWING SHALL NOT BE REPRODUCED IN WHOLE OR IN
PART WITHOUT WRITTEN PERMISSION OF FLM ENGINEERING,INC.

APPENDIX I
POST-DEVELOPMENT HYDROLOGIC MODEL

(2s >
Post-deve opment to
SCM A-1 A
3S
Po- ' -development
1 P =ypass DA-1 B
StormwateriWetland #1
Mill
Post-development DA-1
Subcat Reach Pon Link Drainage Diagram for College St_Stormwater Management
Prepared by FLM Engineering, Inc., Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC

College St_Stormwater Management
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 2
Area Listing (selected nodes)
Area CN Description
(acres) (subcatchment-numbers)
7.450 55 Woods, Good, HSG B (offsite) (3S)
5.781 55 Woods, Good, HSG B (onsite) (3S)
0.100 61 >75% Grass cover, Good, HSG B (2S)
29.263 61 >75% Grass cover, Good, HSG B (offsite) (3S)
1.153 77 Woods, Good, HSG D (onsite) (3S)
3.140 80 >75% Grass cover, Good, HSG D (2S)
5.310 98 Paved parking & roofs (2S)
7.604 98 Paved parking & roofs (offsite) (3S)
59.801 TOTAL AREA

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment 2S: Post-development to SCM DA-1A
Runoff = 27.95 cfs @ 11.97 hrs, Volume= 1.396 af, Depth= 1.96"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-Year Rainfall=2.88"
Area (ac) CN Description
5.310 98 Paved parking & roofs
3.140 80 >75% Grass cover, Good, HSG D
0.100 61 >75% Grass cover, Good, HSG B
8.550 91 Weighted Average
3.240 Pervious Area
5.310 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment 2S: Post-development to SCM DA-1A
Hydrograph
30: 27 95 cfs —
I
Runoff
28_
26_ H Fye wzar-
24 A - 1- 1 1 Rit.4 112 s'
22--
T 644 t1Ale $ 51:fai
20
w 18- A H alnci##IVoluine=11-96-df-
3 16_ I 1 1 1 1 1 1 1 1 R noWPeppth 1$67-
LL 14_
12_ A + 1 H 4 1 1 4 1- 1 1 + TI-o- 1
10
1 1 1 1I I I 1 1 1 1 -gN791-
8;
4_
2= -1 - _
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 4
Summary for Subcatchment 3S: Post-development Bypass DA-1 B
Runoff = 29.42 cfs @ 12.03 hrs, Volume= 1.932 af, Depth= 0.45"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-Year Rainfall=2.88"
Area (ac) CN Description
* 7.604 98 Paved parking & roofs (offsite)
* 29.263 61 >75% Grass cover, Good, HSG B (offsite)
* 7.450 55 Woods, Good, HSG B (offsite)
* 1.153 77 Woods, Good, HSG D (onsite)
* 5.781 55 Woods, Good, HSG B (onsite)
51.251 65 Weighted Average
43.647 Pervious Area
7.604 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
0.9 100 0.0400 1.89 Sheet Flow, Sheet Flow
Smooth surfaces n= 0.011 P2= 3.46"
4.5 977 0.0510 3.64 Shallow Concentrated Flow, Shallow Concentrated Flow
Unpaved Kv= 16.1 fps
3.2 1,430 0.0224 7.37 117.87 Channel Flow, Channel Flow
Area= 16.0 sf Perim= 14.0' r= 1.14'
n= 0.033 Winding stream, pools & shoals
8.6 2,507 Total

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 5
Subcatchment 3S: Post-development Bypass DA-1 B
Hydrograph
32: + 1 1 1 1 1 —I + —Runoff
30: 129.42 cfs
28 —I 1 1 —L I H iyI IIIi241h1r11-Yarn
26. —1 t 1 1 rt L 1 1 Rai r Ii2I 8
24
22 E. —I -k I - I 14 I Rau rio#FAria --5 1 51 a-
20 T I T I RuTncfffIVcIume�--111)326f
- 18:
3 16 H- I I - -H 1 I H H Ru ln-elff-Depth- 0 45!'
u. 14:
12_ 1 1 QW L!n�lli , qi-
1° T T 7 T T 71 T T 7 T TIT T Tre781671i
8_
6- —I T I— 1 1 r
4 E 2 L IA
= -
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 6
Summary for Pond 1 P: Stormwater Wetland #1
Inflow Area = 8.550 ac, 62.11% Impervious, Inflow Depth = 1.96" for 1-Year event
Inflow = 27.95 cfs @ 11.97 hrs, Volume= 1.396 af
Outflow = 0.69 cfs @ 15.02 hrs, Volume= 1.382 af, Atten= 98%, Lag= 183.1 min
Primary = 0.69 cfs @ 15.02 hrs, Volume= 1.382 af
Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 af
Routing by Stor-Ind method, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Peak Elev= 350.90' @ 15.02 hrs Surf.Area= 15,851 sf Storage= 40,813 cf
Plug-Flow detention time= 1,189.3 min calculated for 1.382 af(99% of inflow)
Center-of-Mass det. time= 1,185.0 min ( 1,988.4 - 803.4 )
Volume Invert Avail.Storage Storage Description
#1 348.00' 96,006 cf Custom Stage Data (Irregular)Listed below
Elevation Surf.Area Perim. Inc.Store Cum.Store Wet.Area
_ (feet) (sq-ft) (feet) (cubic-feet) (cubic-feet) (sq-ft)
348.00 9,002 672.6 0 0 9,002
348.10 12,636 666.3 1,077 1,077 9,677
349.00 13,583 682.0 11,796 12,873 11,467
350.00 14,764 699.2 14,169 27,042 13,480
351.00 15,977 716.0 15,367 42,409 15,500
352.00 17,221 732.9 16,595 59,004 17,579
353.00 18,497 749.7 17,855 76,859 19,695
354.00 19,804 766.1 19,147 96,006 21,813
Device Routing Invert Outlet Devices
#1 Primary 347.00' 24.0" x 87.0' long Culvert RCP, groove end projecting, Ke= 0.200
Outlet Invert= 343.00' S= 0.0460 '/' Cc= 0.900 n= 0.013
#2 Device 1 348.00' 2.0" Vert. Orifice C= 0.600
#3 Device 1 349.25' 4.0" Vert. Orifice C= 0.600
#4 Device 1 352.00' 4.00' x 4.00' Horiz. Grate Limited to weir flow C= 0.600
#5 Secondary 352.50' 50.0' long x 17.5' breadth Broad-Crested Rectangular Weir
Head (feet) 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60
Coef. (English) 2.68 2.70 2.70 2.64 2.63 2.64 2.64 2.63
Primary OutFlow Max=0.69 cfs @ 15.02 hrs HW=350.90' (Free Discharge)
4-1=Culvert (Passes 0.69 cfs of 32.18 cfs potential flow)
2=Orifice (Orifice Controls 0.18 cfs @ 8.08 fps)
3=Orifice (Orifice Controls 0.51 cfs @ 5.86 fps)
4=Grate ( Controls 0.00 cfs)
Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=348.00' (Free Discharge)
4-5=Broad-Crested Rectangular Weir( Controls 0.00 cfs)

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 7
Pond 1 P: Stormwater Wetland #1
Hydrograph
30= 1 —[ J_ - - 1_
127.95 cfs I —Inflow
28- —Outflow
I 1 T 1 —Primary
26 Inf Aei w a=8 b5Va ad —Secondary
22 Peak Iev=i5b.60'
1
20 Storage=4081-3
,, 18: 1 4 4 4 4
16 3 ' I 1 1 1
L° 14_ -
12: —[ + 4 + 4
io
III II
8
-
6_ —[ 4 4 4 4
4_
—i 0.69 cfs 1 I
-
0.00 cfs
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

College St_Stormwater Management Type II 24-hr 1-Year Rainfall=2.88"
Prepared by FLM Engineering, Inc. Printed 9/13/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 8
Summary for Link 1 L: Post-development DA-1
Inflow Area = 59.801 ac, 21.59% Impervious, Inflow Depth > 0.67" for 1-Year event
Inflow = 29.91 cfs @ 12.03 hrs, Volume= 3.314 af
Primary = 29.91 cfs @ 12.03 hrs, Volume= 3.314 af, Atten= 0%, Lag= 0.0 min
Primary outflow = Inflow, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Link 1 L: Post-development DA-1
Hydrograph
32= 129.91 cfs I —Inflow
30! ' —Primary
28 inflow Area= 9 81-ac
26_ 41
24_
22- L L L L L L L L L L L L _I
20:
q!
18=
IL 41 + 4LI4 � I
u. 14_
12 — L L L LI L L L L L L L LI
10_ L rt L —IT L
8=
6, L 4 LI _i + 4 1 �
4
2 1 1 1
0 --
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

APPENDIX J
SIMPLE METHOD CALCULATIONS

SCM - IA
Post-development
Impervious to SCM 1
(Subca Reach 'on. Link Drainage Diagram for College St_Discrete Curve Number Model
Prepared by FLM Engineering, Inc., Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC

College St_Discrete Curve Number Model
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 2
Area Listing (selected nodes)
Area CN Description
(sq-ft) (subcatchment-numbers)
231,304 98 Paved parking & roofs (SCM-1A)
231,304 TOTAL AREA

College St Discrete Curve Number Model Type II 24-hr 1-Inch Rainfall=1.00"
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment SCM-1A: Post-development Impervious to SCM 1
Runoff = 6.74 cfs @ 11.96 hrs, Volume= 15,245 cf, Depth= 0.79"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-Inch Rainfall=1.00"
Area (ac) CN Description
5.310 98 Paved parking & roofs
5.310 Impervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment SCM-1A: Post-development Impervious to SCM 1
Hydrograph
7 16.74 cfs I I —Runoff
T l pe I� 24-hr -Inch
Iiaiifill 1 00"
5: _H-Riinloff Area=5.310-a6-
N l Ruriaff Vglume=15,245 cf
4- Il Run?ff Dgp hT079"-
LL T
3— rtc-60 ��
CN=98
2-
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

SCM - lB
Post-development
Pervious to SCM 1
Subcat Reach 'on. Link Drainage Diagram for College St_Discrete Curve Number Model
Prepared by FLM Engineering, Inc., Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC

College St_Discrete Curve Number Model
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 2
Area Listing (selected nodes)
Area CN Description
(sq-ft) (subcatchment-numbers)
136,778 61 >75% Grass cover, Good, HSG B (SCM-1B)
4,356 80 >75% Grass cover, Good, HSG D (SCM-1 B)
141,134 TOTAL AREA

College St Discrete Curve Number Model Type II 24-hr 1-Inch Rainfall=1.00"
Prepared by FLM Engineering, Inc. Printed 8/27/2024
HydroCAD®8.50 s/n 002245 ©2007 HydroCAD Software Solutions LLC Page 3
Summary for Subcatchment SCM-1 B: Post-development Pervious to SCM 1
Runoff = 0.00 cfs @ 0.00 hrs, Volume= 0 cf, Depth= 0.00"
Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-120.00 hrs, dt= 0.05 hrs
Type II 24-hr 1-Inch Rainfall=1.00"
Area (ac) CN Description
0.100 80 >75% Grass cover, Good, HSG D
3.140 61 >75% Grass cover, Good, HSG B
3.240 62 Weighted Average
3.240 Pervious Area
Tc Length Slope Velocity Capacity Description
(min) (feet) (ft/ft) (ft/sec) (cfs)
6.0 Direct Entry,
Subcatchment SCM-1 B: Post-development Pervious to SCM 1
Hydrograph
—Runoff
Type II 24-hr 1 -Inch
Rainfall=1 .60"
Runoff Area=3.240 ac
I I I
Riunoff Volume=0
Runoff Depth=0. 0"
+c'=6.O min
CN=62
0.00 cfs
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
Time (hours)

APPENDIX K
SCM SUPPLEMENTAL FORM

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name E Carolina Ave Subdivision
2 Project Area(ac) 22_06
3 Coastal Wetland Area(ac)
4 .Surface Water Area(ac)
b 1,Is this project High or Low Density'? High
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
l 7 Width of vegetated setbacks provided(feet) Min.30'from any applicable surface waters;
8 Will the vegetated setback remain vegetated? _ Yes
9 'If BUA is proposed in the setback,does it meet NCAC 02H 1003(4)(c-d)? N/A
10 Is streambank stabilization proposed on this project? I No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland 1
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS
20_Disconnected Impervious Surface(DIS)
21 'Treatment Swale
22 'Dry Pond
23 .StormFilter
24 ttiSilva Cell
25 ,Bayfilter
26 I Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Jon Frazier.PE/Principal
28 Organization. FLM Engineering,Inc.
29 Street address: PO Box 91727
30 City,State,Zip: Raleigh,NC 27675
31 Phone number(s): 919.610.1051
32 Email: jfrazier©flmengineering.com
Certification Statement:
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that
the information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
Designer
,`%'`Nr CAR O/''',
0PoFESSr • /'-y
SEA _ S,gnatur D signer
021
L�� NGINE *e
yA N 2/440 2-4-
Seal Date

DRAINAGE AREAS
t Is this a high density project? Yes
2 If so,number of drainage areas&SCMs 1
3 Does this project have low density areas? No
i 4 If so.number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 1 Type of SCM Wetland
5 Total drainage area(sq ft) 372400
6 Onsite drainage area(so ft) 940.600 372400
7 Offsite drainage area(sq ft) _ 940,600
8 Total BUA in project(sq ft) 231325 sf 231325 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 132990 sf 132990 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 98335 sf 98335 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) 24295 sf 24295 sf
-Roof(sq ft)
-Roadway(sq ft) 74040 sf 74040 sf
-Future(sq ft)_
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)
16 Existing BUA that is already permitted Ssq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 25% 62%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 16406 cf
21 Calculation method for design volume 'Discrete Curve No.
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

DRAINAGE AREAS
i 1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 1
3 Does this project have low density areas? No
4 If so,number of low density drainage areas 0
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
.DRAINAGE AREA INFORMATION Entire Site
4 Type of SCM
5 Total drainage area(sq ft)
6 Onsite drainage area(sq ft) 940.600
7 ' drainage area(sq ft) 940.600
8 :offsiteTotal BUA in pr ject jsq ft) 231325 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 132990 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) _ 98335 sf
11 i Offsite BUA(sq ft)
12 'Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) 24295 sf
-Roof(sq ft)
-Roadway(sq ft) 74040 sf
Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft)16 'Existing BUA that is already permitted(sq ft) —
17 .Existing BUA that will be a removed(sq ft)
18 'Percent BUA 25%
19 Design storm(inches)._
20 Design volume of SCM(cu ft)
21 iCalculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s)

STORMWATER WETLAND
I Drainage area number _ 1
t 2 Minimum required treatment volume(cu ft) 15245 Cf
3.15 the SCM sized to treat the SW from all surfaces al build-out? Yes
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM(9V? _ 3.1
6i Does the SCM have retaining walls,gabion walls or other engineered No
side slopes?
Are the inlets,outlets,and receiving stream protected from erosion
7.(10-year stoat,))? Yes
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9i What is the method for dewatering the SCM for maintenance? Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes
11 i Does the maintenance access comply with General MDC(8)? Yes
12 Does the drainage easement comply with General MDC(9)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with Yes
General MDC(10)? _
14 Is there an O&M Agreement that compiles velh General MDC(11)? Yes
15)Is there an O&M Plan that complies with General MDC(12)? Yes
16:Does the SCM follow the device specific MDC? Yes
17 Was the SCM designed by an NC licensed professional? Yes
E H.
18I Design volume of SCM(Cu 8) 16406
Are the inlet(s)and outlet located in a manner that avoids short-
19 circuiting? Yes
20 Are berms or baffles provided to improve the flow path? No
21 Does the orifice drawdown from below the top surface of the Yes
permanent pool?
Does the wetland minimize impacts to the receiving channel from the
22 1-yr,24-hr storm? Yes
23 Is a trash rack or other device provided to protect the outlet system? Yes
Elevoftolle
24 Elevation,peak attenuation above temporary pool(if applicable)(fmsl) 350.90
2 -Elevation,temporary pool(top of the temporary inundation zone) 349 25
_,(fmsl)
26 Elevation,permanent pool(top of the shallow water zone)(fmsl) 348.00
27 Elevation,bottom of shallow water zone(fmsl) 347.25
28 Elevation,bottom of forebay deep pool at deepest point(at forebay 344.67
:entrance)(fmsl)
29'Elevation,bottom of forebay deep pool at shallowest point(at forebay 346.00
exit)(fmsl)
30 Elevation.bottom of non-forebay deep pool at deepest point(fmsl) 345.00
Planting Zones
31 Area,total surface area of the SW wetland at temporary pool elev 13,850.00
(sg ft)
32 Area,temporary inundation zone at temporary pool elev (sg ft) 4,848.00
33 Area,shallow water zone at temporarypool elev.(sg ft) 4,848.00
34 Area,forebay at temporary pool elev.(sg ft) 2,077.00
35 Area,non-forebay deep pool at temporary pool elev_(sq ft) 2.077.00
36 Percent area provided,temporary inundation zone(should be 30- %
45%)
37 Percent area provided,shallow water zone(should be 35-45%) 35%
38 Percent area provided,deep pool(forebay)(should be 10-15%) 15%
39 Percent area provided,deep pool(non-forebay)(should be 5-15%) 15%
Depths and Outlet
40 Peak attenuation depth above to porarr inundation zone(inches)._ 24 in
41 Temporary inundation zone depth(temporary pool to permanent pool) 15 in
(inches)
42 Shallow water zone depth(permanent pool to bottom of wetland) 9 in
(inches)
43 Depth,forebay at entrance(permanent pool to bottom of fix ebay 40 in
entrance)(inches)
44 Depth,forebay at exit(permanent pool to bottom of forebay exit) 24 in
(inches)
45 Depth,non-forebay deep pools(permanent pool to deep pool bottom) 36 in
(inches)
46 If there is an orifice,diameter(inches) 2 in
47 If there is a weir.weir height(inches)
48 If there is a weir,weir length(inches)
49 Drawdown time for the leinenny pool/days) 2:13
Soil and Plants
501Soil amendment depth(Inches) 12 In
511 Has a soil amendment specification been provided? Yes
52 Has a landscaping plan that meets SW Wetland MDC(12)been Yes
provided?
53 Number of plants per 200 square feet Min the shallow water zone
54 Does the temporary inundation zone planting comply with SW Yes
Wetland MDC(14)?
59 ro tho dam ctructuro and tomporary fill clopoc plantod in non Yes
clumping turfgrass? -
56)Will cattails be planted in the wetland? No
ADDITIONAL INFORMATION
57 Please use has space to provide any additional Information about the
stormwater welland(s):

APPENDIX L
DRAW DOWN CALCULATIONS

Stormwater Wetland#1
Water Quality Volume Drawdown Calculations
Volume provided at 15" 16406 ft3
Orifice Equation
Outlet Diameter 2 in
Cd = 0.6
Ho / 3 = 0.42 ft
g = 32.2 ft/ sect
A = 0.022 sf
Q = 0.068 cfs
241110.8322 seconds
Drawdown Time 67.0 hours

APPENDIX M
RIP RAP ENERGY DISSPATOR CALCULATIONS

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project College Street Townhomes Date
Project No. 24024 Designer
Outlet ID FES-SCM INLET
Outlet flowrate 37.45 cfs
Pipe diameter 36 inches
Number of pipes 1
Pipe separation feet
Outlet pipe slope 1.52 percent
Figure 8.06.b.1
25
20
Zuue-6
U
15
w
10 - NM
UPI
5 Zone I
Zone 3
0
0 2 4 6 8 10
Pipe diameter(ft)
Zone from graph above= 2
Outlet pipe diameter 36 in. Length= 18.0 ft.
Outlet flowrate 37.5 cfs Width= 9.0 ft.
Outlet velocity 5.3 ft/sec Stone diameter= 6 in.
Material= Class B Thickness= 22 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o) 3 x D(o)
2 Class B 6 22 6 x D(o) 3 x D(o)
3 Class I 13 22 8 x D(o) 3 x D(o)
4 Class I 13 22 8 x D(o) 3 x D(o)
5 Class II 23 27 10 x D(o) 3 x D(o)
6 Class II 23 27 10 x D(o) 3 x D(o)
7 Special study required
1.Calculations based on NY DOT method-Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2.Outlet velocity based on full-flow velocity
College St Townhomes_RipRap Outlet Pipe Protection.xlsx
10/16/2024

DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET
Project College Street Townhomes Date
Project No. 24024 Designer
Outlet ID FES-SCM OUTLET
Outlet flowrate 17.55 cfs
Pipe diameter 24 inches
Number of pipes 1
Pipe separation feet
Outlet pipe slope 4.6 percent
Figure 8.06.b.1
25
20
Zuue-6
15
10 - NM—
UPI
5 Zone 1 •6 ft/s2c
Zone 3
0
0 2 4 6 8 10
Pipe diameter(ft)
Zone from graph above= 1
Outlet pipe diameter 24 in. Length= 8.0 ft.
Outlet flowrate 17.6 cfs Width= 6.0 ft.
Outlet velocity 5.6 ft/sec Stone diameter= 3 in.
Material= Class A Thickness= 9 in.
Zone Material Diameter Thickness Length Width
1 Class A 3 9 4 x D(o) 3 x D(o)
2 Class B 6 22 6 x D(o) 3 x D(o)
3 Class I 13 22 8 x D(o) 3 x D(o)
4 Class I 13 22 8 x D(o) 3 x D(o)
5 Class II 23 27 10 x D(o) 3 x D(o)
6 Class II 23 27 10 x D(o) 3 x D(o)
7 Special study required
1.Calculations based on NY DOT method-Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
2.Outlet velocity based on full-flow velocity
College St Townhomes_RipRap Outlet Pipe Protection.xlsx
10/16/2024

APPENDIX N
OPERATION & MAINTENANCE AGREEMENT

Operation & Maintenance Agreement
Project Name: College St Townhomes
Project Location: College St, Franklinton, NC
Cover Page
Maintenance records shall be kept on the following SCM(s). This maintenance record shall be kept in a log in a known set location.
Any deficient SCM elements noted in the inspection will be corrected, repaired, or replaced immediately These deficiencies can
affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the SCM(s).
The SCM(s) on this project include (check all that apply &corresponding O&M sheets will be added automatically)
Infiltration Basin Quantity: Location(s):
Infiltration Trench Quantity: Location(s):
Bioretention Cell Quantity: Location(s):
Wet Pond Quantity: Location(s):
Stormwater Wetland Quantity: 1 Location(s). Southeast corner of site
Permeable Pavement Quantity: Location(s):
Sand Filter Quantity: Location(s):
Rainwater Harvesting Quantity: Location(s)
Green Roof Quantity: Location(s):
Level Spreader- Filter Strip Quantity: Location(s):
Proprietary System Quantity: Location(s):
Treatment Swale Quantity: Location(s):
Dry Pond Quantity: Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: No Type:
CLICK TO UPDATE O&M MANUAL
I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for
each SCM above, and attached O&M tables. I agree to notify NCDEQ of any problems with the system or prior to any changes to
the system or responsible party.
Responsible Party: Patrick Rost,
Title & Organization: Managing Member, CP Land and Holdings, LLC
Street address: 105 Faircloud Ct
City, state, zip: Cary, NC 27513
Phone number(s): 919.747.1669
Email: [e-mail]
Signature: Date: q /
t, U N7 tf L L , a Notary Public for the State of /fir 6 /i
County of 1.�,1GY �. , do hereby certify that ?c (._-I< 'I A Q5
personally appeared before me this I day of S 1-L and
acknowledge the due execution of the Operations and Maintenance Agreement .
Witness my hand and official seal,
KUNTAL PATEL
Notary Public
Wake Co., North Carolina
My Commission Expires October 16,2028
Seal My commission expires 6 L4- I �/ '-t43`'4-
STORM-EZ 9/18/2024
Version 1.5 O&M Agreement Page 1 of 4

Stormwater Wetland Maintenance Re.uirements
Important operation and maintenance procedures:
Immediately following construction of the stormwater wetland, conduct bi-weekly inspections and water
wetland plants bi-weekly until vegetation becomes established (commonly six weeks).
Before and immediately after plant installation, monitor water level and adjust to ensure that plants are
not completely inundated.
No portion of the stormwater wetland will be fertilized after the initial fertilization that is required to_
establish the wetland plants.
- Stable groundcover will be maintained in the drainage area to reduce the sediment load to the wetland.
_ At least once annually, a dam safety expert will inspect the embankment. Any problems that are found
will be repaired immediately.
After the wetland is established, it shall be inspected quarterly and within 24 hours after every storm event greater
than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance shall be kept in a known
set location and shall be available upon request.
Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately.
SCM element: Potential problem: How I will remediate the problem:
The entire wetland Trash/debris is present. Remove the trash/debris.
The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to remove the gully, plant ground
wetland erosive gullies have cover and water until it is established. Provide lime and a one-
formed. time fertilizer application.
The inlet pipe is clogged (if Unclog the pipe. Dispose of the sediment off-site.
applicable).
The inlet pipe is cracked or
The inlet device otherwise damaged (if Repair or replace the pipe.
applicable).
Erosion is occurring in the Regrade the swale if necessary and provide erosion control
swale (if applicable). devices such as reinforced turf matting or riprap to avoid future
problems with erosion.
Sediment has accumulated
in the forebay to a depth of Search for the source of the sediment and remedy the problem if
less than 15" or that possible. Remove the sediment and dispose of it in a location
inhibits the forebay from where it will not cause impacts to streams or the SCM.
functioning well.
The forebay
Erosion has occurred. Provide additional erosion protection such as reinforced turf
matting or riprap if needed to prevent future erosion problems.
Weeds are present. Remove the weeds, preferably by hand. If pesticide is used,
wipe it on the plants rather than spraying.

Stormwater Wetland Maintenance Requirements (Continued)
•SCM element: Potential problem: How I will remediate the problem:
A tree has started to grow If the tree is <6" in diameter, remove the tree. If the tree is >6" in
on the embankment. diameter, consult a dam safety specialist to remove the tree.
An annual inspection by an
Embankment appropriate professional
shows that the Make all needed repairs immediately.
embankment needs repair.
Evidence of muskrat or Consult a professional to remove muskrats or beavers and repair
beaver activity is present. any holes or erosion.
Algal growth covers over
30% of the deep pool and Consult a professional to remove and control the algal growth.
shallow water areas.
Cattails, phragmites or
other invasive plants cover Remove the plants by hand or by wiping them with pesticide (do
30% of the deep pool and not spray) - consult a professional.
shallow water areas.
The temporary inundation
zone remains flooded more Unclog the outlet device immediately.
than 5 days after a storm
event.
Deep pool, shallow water Determine the source of the problem: soils, hydrology, disease,
and shallow land areas Plants are dead, diseased etc. Remedy the problem and replace plants. Provide a one-
or dying. time fertilizer application to establish the ground cover if
necessary.
Best professional practices
show that pruning is Prune according to best professional practices.
needed to maintain optimal
plant health.
Sediment has accumulated Search for the source of the sediment and remedy the problem if
and reduced the depth to possible. Remove the sediment and dispose of it in a location
75% of the original design where it will not cause impacts to streams or the SCM.
depth of the deep pools.
Sediment has accumulated Search for the source of the sediment and remedy the problem if
Micropool and reduced the depth to possible. Remove the sediment and dispose of it in a location
75% of the original design where it will not cause impacts to streams or the SCM.
depth.
Clogging has occurred. Clean out the outlet device. Dispose of the sediment in a
gg g location where it will not cause impacts to streams or the SCM.
The outlet device
The outlet device is Repair or replace the outlet device.
damaged

Stormwater Wetland Maintenance Requirements (Continued)
SCM element: Potential problem: How I will remediate the problem:
Erosion or other signs of
damage have occurred at Repair the damage and improve the flow dissipation structure.
the outlet.
The receiving water Discharges from the
wetland are causing Contact the local NCDEQ Regional Office.
erosion or sedimentation in
the receiving water.

APPENDIX 0
SNAP TOOL VERSION 4.2

Project Information Complete this sheet if required by your reviewing authority.
Contact them for any questions. Grey boxes/text are optional.
SNAPv4.2.0 LOCATION
Project Name (optional): College St Townhomes Parcel ID (optional):
Submission Date(optional): 8/26/2024 date Nutrient Management Watershed: Tar_Pamlico menu
Local Jurisdiction/Reviewing Agency: Franklinton menu Subwatershed: Upper_Tar_River menu
Project Latitude Coordinates(optional): 36.098380 N Phosphorus Delivery Zone: Tar- Upper 03020101 menu
Project Longitude Coordinates(optional): -78.453500 W Nitrogen Delivery Zone: Tar- Upper 03020101 menu
PROJECT DETAILS
Development Land Use Type: Single Family Residential menu Disturbed Area: ft2
Part of Common Development Plan? no yin Project Activity: New Development menu
Designated Downtown Area? no yin Project Drains to SA Waters? no y/n
Public Linear Road/Sidewalk Project? no y/n Pre-Project Land Use: forest menu
Project Owner Type: Private menu Project Description (optional):
STORM WATER DETAILS
(Falls ONLY)Onsite Reduction%Req. % (Project Uses LID/Runoff Volume Match? no y/n
Existing BUA/Development Onsite? yes y/n Local Gov't nutrient req's same as State? yes y/n
Local Gov't cutoff date for Existing BUA: date Project Drains to Regional SCM? no y/n
Nitrogen Export Rate Target: 4.00 lb/ac/yr Total Nitrogen Offset Credits Needed: lb/yr
Phosphorus Export Rate Target: 0.80 Ib/ac/yr Total Phosphorus Offset Credits Needed: lb/yr

SNAP v4.2.0
Project Area and Offsite Land Cover Characteristics Precipitation Louisburg
Station:
Copy Paste VALUES ONLY for Best Results Click here to scroll down to error messages on this sheet.
l
PROJECT AREA LAND COVERS TN EMC (mg/L) TP EMC (mg/L) Pre-Project Area (ft2) Post-Project Area (ft2) Change pre-to-post(ft2)
I
Roof 1.18 0.11 88,452 88,452
Roadway 1.64 0.34 74,040 74,040
Parking/Driveway/Sidewalk 1.42 0.18 68,833 68,833
Protected Forest 0.97 0.03 0
Managed Pervious/Landscaping 2.48 1.07 940,600 695,425 -245,175
Offsite or Existing Roof 1.18 0.11 0
Offsite or Existing Roadway 1.64 0.34 0
Offsite or Existing Parking/Driveway/Sidem 1.42 0.18 0
Offsite Protected Forest 0.97 0.03 0
Offsite Managed Pervious 2.48 1.07 0
CUSTOM LAND COVER 1 0
CUSTOM LAND COVER 2 0
CUSTOM LAND COVER 3 0
LAND TAKEN UP BY SCM 1.18 0.11 13,850 13,850
Total (Regulated & UnReg)Area 940,600.00 940,600.00
Project (Regulated)Area 940,600.00 940,600.00

SCM Characteristics
Stormwater Control Measure (SCM) Characteristics
Click here to go to
Copy £t Paste VALUES ONLY SCM101's Land Cover Data
SNAP v4.2.0
for Best Results
IL Catchment ID 1 I 1 1
- Drains to Drains to
SCM ID 101 > 102 / 103
I' Type of SCM Stormwater Wetland
IHydrologic soil group at SCM location B
IL SCM Description
esign Storm Size (inches/24hrs) 1.00
lPercent of Full Size 108% T--- --....
Annual Effluent 57% 0% 0%
r %Annual Overflow 13% 0% 0%
II %Annual ET/Infiltrated 31% 0% 0%
Custom %Annual Effluent
Custom %Annual Overflow
Custom %Annual ET/Infiltrated
SCM Effluent TP EMC (mg/L) 0.15 0.00 0.00
SCM Effluent TN EMC (mg/L) 0.94 0.00 0.00
Custom Effluent TP EMC l
Custom Effluent TN EMC
I. SCM Land Cover TP EMC (mg/L) 0.11 0.00 0.00
LSCM Land Cover TN EMC (mg/L) 1.18 0.00 0.00
rThis SCM Drains to Numbered SCM 0 0 0
Catchment Routing Catchments Draining to Catchments Draining to Catchments Draining to
SCM 101 SCM 102 SCM 103
Catchment 1
Catchment 2
Catchment 3
Catchment 4
Catchment 5
Catchment 6

SCM Characteristics
Error Check- Missing SCM Area:
Error Check- Min/Max Size:
Error Check-Hydrology:
Error Check- Missing SCM Info:
Error Check-Drainage Data w/o SCM:
Error Checks-SCM Type:
NM SCM ID: 101 102 103
7Area Draining Directly to Area Draining Directly to Area Draining Directly to
SCM Drainage Area Land Covers SCM 101 (ft2) SCM 102 (ft2) SCM 103 (ft2)
Roof 88,452
Roadway 74,040
Parking/Driveway/Sidewalk 68,833
Protected Forest
Managed Pervious/Landscaping 127,225
Offsite or Existing Roof
Offsite or Existing Roadway
Offsite or Existing Parking/Driveway/Sidewalk
Offsite Protected Forest
Offsite Managed Pervious
CUSTOM LAND COVER 1
CUSTOM LAND COVER 2
CUSTOM LAND COVER 3
LAND TAKEN UP BY SCM 13,850
TOTAL AREA DRAINING TO SCM (ft2): 372,400 0 0
CATCHMENT AREA(ft2): 372,400

Nutrient Export Summary SNAP v4.2.0
Landcover Et SCM Data Review
Errors/Advisories Errors/Advisories
Avg Annual precip (in) = 45.63 SCM Area (ft2) = 13,850
Total (Regulated+
940,600 SCM Treated Area (ft2)= 372,400
Unregulated)Area (ft2)=
Project(Regulated)
940,600 Catchment Routing: No errors
Area (ft2)=
Net BUA(Project Area Treating Runoff from
BUA only ft2)= 231,325 Net BUA indicates new development or expansion. Existing BUA or Offsite:
no
Custom Landcovers are 2 missing or not If using tool for Stormwater Compliance,check Project
present: no Disturbed Area (ft ) = matching
Info for missingDisturbed Area.
Total Nitrogen Export Target 86.37 Total Phosphorus Export TargetI 17.27
Scaled to Project Area (Ib/yr): Scaled to Project Area (Ib/yr):
Total Area Total Area Project Area Total Area Project Area Total Area Project Area Total Area Project Area
Project Area
(Onsite+ Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project Post-Project
Nutrient Export Summary (Onsite Only)
Offsite) before before after after SCM-Treated SCM-Treated Untreated Untreated
Pre-Project Pre Project Treatment Treatment Treatment Treatment Area Only Area Only Areas Areas
Area (All Landcover Types)(acres) 21.5932 21.5932 21.5932 21.5932 21.5932 21.5932 8.5491 8.5491
Percent Built-Upon Area (BUA)(%) 0% 0% 25% 25% 25% I 25% 0'. 0'.
Built-Upon Area(BUA)(sqft) 0 0 231,325 231,325 231,325 231,325 231,325 231,325 0 0
Annual Runoff Volume(ft3/yr) 160,948 160,948 918,463 918,463 667,850 667,850 •
Annual Runoff%Change
�����������������\ 471% 471% 315% 315% _ \-\
Total Runoff Change(cuft/yr) 757,515 757,515 506,901 506,901 N
,:,. \--, ���������
Total Nitrogen EMC(mg/L) 2.48 2.48 1.53 1.53 1.24 1.24 _ 1.03 1.03 2.48 2.48
Total Nitrogen Load Leaving Site(Ib/yr) 24.92 24.92 - 87.60 I 87.60 51.58 [ 51.58 36.53 36.53 15.06 15.06
Total Nitrogen Loading Rate(Ib/ac/yr) 1.15 1.15 4.06 4.06 2.39 2.39 4.27 4.27 1.15 1.15_
Total Nitrogen%Change Pre-to-Post N 251% 251% 107% 107%
Total Nitrogen Change (Ib/yr) Pre-to-Post 62.68 62.68 26.66 r 26.66
Total Phosphorus EMC(mg/L) 1.07 1.07 0.31 0.31 0.30 0.30 0.16 0.16 1.07 1.07
Total Phosphorus Load Leaving Site(Ib/yr) 10.75 10.75 _ 17.88 I 17.88 12.30 4 12.30 5.80 5.80 6.50 6.50
Total Phosphorus Loading Rate(Ib/ac/yr) 0.50 0.50 0.83 0.83 0.57 _ 0.57 0.68 0.68 0.50 0.50
Total Phosphorus%Change Pre-to-Post 66% 66% 14% 14% �� �����
Total Phosphorus Change(Ib/yr)Pre-to-Post 7.12 7.12 1.55 I 1.55 NN k����
SCM/Catchment Summary
Volume 1 TN Reduction TP Reduction TN Out TP Out
SCM ID and Type Falls Lake ONLY: Onsite Reduction Compliance Check
Reduction(%) (%) (%) (Ibs/ac/yr) (Ibs/ac/yr)
Catchment 1 30.52% - 49.65% 49.01% 4.27 0.68 Nitrogen Phosphorus
I
101:Stormwater Wetland 30.52% 49.65% 49.01% 4.27 0.68 Onsite%Reduction Requirement
102:NA 0.00% 0.00% 0.00% _ 0.00 0.00 Export Target Scaled to Area(Ib/yr) 86.37 17.27
103:NA 0.00% 0.00% 0.00% 0.00 0.00 Export Load Post-Project Before Treatment 87.60 17.88
Catchment 2 0.00% _ 0.00% 0.00% 0.00 0.00 Total Reduction Need(Ib/yr)
201:NA 0.00% 0.00% 0.00% 0.00 0.00 Onsite Reduction Need (Ib/yr)
202:NA 0.00% 0.00% 0.00% 0.00 0.00 Onsite Export Target(lb/yr)
203:NA 0.00% 0.00% 0.00% 0.00 0.00 Project Area Post-Project After Treatment 51.58 12.30
Catchment 3 0.00% 0.00% 0.00% 0.00 0.00
301:NA 0.00% 0.00% 0.00% 0.00 0.00
302:NA 0.00% 0.00% 0.00% _ 0.00 0.00
303:NA 0.00% 0.00% 0.00% 0.00 0.00
Catchment 4 0.00% 0.00% 0.00% 0.00 0.00
401:NA 0.00% 0.00% 0.00% 0.00 0.00
402:NA 0.00% 0.00% 0.00% 0.00 0.00
403:NA 0.00% 0.00% 0.00% 0.00 0.00
Catchment 5 0.00% 0.00% 0.00% 0.00 0.00
501:NA 0.00% 0.00% 0.00% 0.00 0.00
502:NA 0.00% 0.00% 0.00% 0.00 0.00
503:NA 0.00% 0.00% 0.00% 0.00 0.00
Catchment 6 0.00% _ 0.00% 0.00% 0.00 0.00
601:NA 0.00% 0.00% 0.00% 0.00 0.00
602:NA _ 0.00% 0.00% 0.00% 0.00 0.00
603:NA 0.00% 0.00% 0.00% 0.00 0.00

Nutrient Management Strategy Watershed - Nutrient Offset Credit Reporting Form
SNAP v4.2.0
Please complete and submit the following information to the local government permitting your development
project to characterize it and assess the need to purchase nutrient offset credits. Contact and rule
implementation information can be found online at:
http://deq.nc.gov/about/divisions/water-resources/planning/nonpoint-source-management/nutrient-offset-information
PROJECT INFORMATION
Applicant Name:
Project Name: College St Townhomes
Project Address:
Date: (mm/dd/yyyy) Development Land Use Type: Single Family Residential
County: Project Activity Type: New Development
Project Area(sqft): 940,600 Project Latitude: 36.098380
Post-Project Built-Upon Area%: 24.59% I Project Longitude: -78.453500
WATERSHED INFORMATION
Nutrient Management Watershed: Tar Pamlico N Target Export Rate(Ib/ac/yr): 4.00
Subwatershed: Upper_Tar_River P Target Export Rate(Ib/ac/yr): 0.80
Nitrogen Delivery Zone: Tar-Upper 03020101 Nitrogen Delivery Factor: 100%
Phosphorus Delivery Zone: Tar-Upper 03020101 Phosphorus Delivery Factor: 100%
PERMANENT NUTRIENT OFFSET REQUEST
Post-Project Nitrogen Calculations -Projects with No Offsite or Built-Upon Area
(A) (B) (C) (D) (F) (G) (Where
Applicable)
TN Export TN Remaining TN Permanent Additional Total TN
TN Untreated TN Treated TN Delivery Offsets Permanent
Load(Ib/yr) Target Load Load(Ib/yr) Reduction Local Gov't
Factor(%) Required Offsets to Buy
(Ib/yr) Need(Ib/yr) (Ib/yr) Offsets(Ib/yr) (Ib/yr)
87.6 86.4 51.6 0.0 1.0 0.0 0.0 I
Post-Project Phosphorus Calculations-Projects with No Offsite or Built-Upon Area
(A) (B) (C) (D) (F) (G) (Where
Applicable)
TP Export TP Remaining TP Permanent Additional Total TP
TP Untreated Target Load TP Treated Reduction TP Delivery Offsets Local Gov't Permanent
Load(Ib/yr) (Ib/yr) Load(Ib/yr) Need(Ib/yr) Factor(%) Required Offsets(Ib/yr) Offsets to Buy
(Ib/yr) (lb/yr)
17.9 17.3 12.3 0.0 1.0 0.0 0.0 I
LOCAL GOVERNMENT AUTHORIZATION
Local Government Name:I
Staff Name: Phone:
Staff Email: Date:
Local Government Authorizing Signature:

APPENDIX P
SHWT REPORT

S&
Soil & Environmental Consultants, Inc.
E 8412 Falls of Neuse Road,Suite 104,Raleigh,NC 27615•Phone[phone]•Fax[phone]
sandec.com
FLM Engineering September 25, 2024
Attn: Jon Frazier S&EC Job#15885.S1
PO Box 91727
Raleigh,NC 27675
Re: Detailed storm water soils evaluation for CP Land and Holdings Property, S Chavis St,
Franklinton,NC
Dear Mr. Frazier:
Soil & Environmental Consultants, Inc (S&EC)performed a detailed soil evaluation within
the targeted area of the potential storm water control measure (SCM) on the site mentioned
above. The purpose of this evaluation was to provide additional information for the proper
design of the proposed SCM to treat the on-site storm water per 15A NCAC 02H storm water
rules. A soil morphological profile description was performed at the specified location to
determine depth to seasonal high water table (SHWT). The following is a brief report of the
methods utilized in this evaluation and the results obtained.
Soil/Site Evaluation Methodology
The site evaluation was performed by advancing hand auger borings to sufficient depth to
estimate SHWT. S&EC navigated to the pre-determined SCM location to describe soil
morphological conditions using standard techniques outlined in the "Field Book for
Describing and Sampling Soils, Version 3"published by the Natural Resources Conservation
Service (NRCS, 2012).
Soil/Site Conditions
This site is located in the Piedmont geological area of Franklin County. The soil boring was
in one proposed SCM location.
The soil observed at SB-1 is similar to a Vance series. These soils are well drained and have
slow permeability. Field investigation revealed SHWT indicators within 6.5 feet from the top
of the ground and there was no observed, apparent water table within 9 feet from the top of
the ground. A soil profile for SB-1 is shown below.

SB-1
Horizon Depth Matrix Texture Redoximorphic Other notes
(inches) Color Features
A 0— 3 10YR 4/2 Sandy Loam
Bt1 3 26 10YR 5/4 Sandy Clay
Bt2 26—35 10YR 4/6 Clay Loam
BC 35 —69 10YR 4/6 Sandy Clay
Loam
Cl 69—80 10YR 6/4 Sandy Clay
Loam
C2 80— 108 10YR 6/4 Sandy Clay 10YR 7/1 Common,coarse
Loam depletions, SHWT at
80";No apparent water
table within 108"
At the time of the soils evaluation, the type of SCM had yet to be determined. Each storm
water device has different requirements with regard to in-situ soils. S&EC made no attempt
to measure soil saturated hydraulic conductivity(Ksat) in the underlying soil at this time.
Soil & Environmental Consultants, Inc is pleased to be of service in this matter and we look
forward to assisting in the successful completion of the project. If requested, S&EC can meet
on-site with state or local regulatory agencies to discuss our findings and recommendations.
Please feel free to call with any questions or comments.
Sincerely,
Soil & Environmental Consultants, Inc
•
,c. ;ems':7 '; "% u-1 i
�?. U,
John Lewis ( ,-, .Z• z' <s' y ,C, r� :`t "1
NC Licensed Soil Scientist#1345 .- ?--'1
Encl: Soil Boring Location Map y, •!"-•,cr,,ki•,, v
/345 Q-O
nFP10RTN G
Page 2 of 2

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Project Number: Map Title: N
15885.5 I
Project Manager: Boring Location Map +
DW CP Land and holdings Site
Scale: Pranklinton, NC
I " = 200' S& soil&Environmental Consultants,Inc.
Source:
Date: NC OneMap EC .12 I AIL.of Newe Itoml,,ice 104,Ma WI,V<MIS•Mune 019)S.5•110•i A%(91,)/146,467
8/29/24

APPENDIX Q
IMPERVIOUS AREA CALCULATIONS

ONSITE IMPERVIOUS SURFACE
No. SF per Total (SF)
ROOF 78 1134 88452
ROAD 1 74040 74040
SIDEWALK 1 24295 24295
DRIVEWAY 78 416 32448
10% TOWNHOME CONTINGENCY 12090
TOTAL 231325