NCG140494_Burlinton North 1400 NOI application_20210113

ASUNROCK�
CAROLINA SUNROCK LLC
Scott Martino
Manager Environmental Compliance
200 Horizon Drive, Suite 100
Raleigh, NC 27615
Certified. 7020 0090 0002 2576 4707
December 11, 2020
Ms. Annette Lucas, PE
Stormwater Program Supervisor
Division of Energy, Mineral, and Land Resources
512 N. Salisbury Street
Raleigh, NC 27604
RE: Application for Coverage under NPDES General Permits
NCG140000
Carolina Sunrock LLC — Burlington North Distribution Center
12971 NC Hwy 62 Burlington, Caswell County, North Carolina 27217
Dear Ms. Lucas:
The purpose of this letter is to provide you and your department with the enclosed Notice of Intent (NOI)
application, with supporting information, for coverage under NPDES General Permit NCG140000 for the
above referenced facility.
Please feel free to contact me if you or your department have any further questions or need clarification.
Thank you for your assistance.
Sincerely,
Carolina Sunrock, LLC
Scott Martino
Manager Environmental Compliance
Enclosure
Signed Notice of Intent — General Permit Applications (NCG140000)
Sediment Erosion Control Designs and Calculations
Proposed Facility Plans
Design and Calculations of Proposed Concrete Plant Process Water System
Page 1of1

NCG140000 NOI
Carolina Sunrock — Burlington North
Distribution Center
December 11, 2020
NOI APPLICATION

Division of Energy, Mineral and Land Resources
Stormwater Program
National Pollutant Discharge Elimination System
Environmental Quality NCG140000
NOTICE OF INTENT
FOR AGENCY USE ONLY
Date Received
Year
Month
Da
Certificate of Coverage
NICIGI 1141
Check #
Amount
Permit Assigned to
National Pollutant Discharge Elimination System application for coverage under General Permit NCG140000:
STORMWATER AND PROCESS WASTEWATER DISCHARGES associated with activities classified as:
SIC (Standard Industrial Classification) Code: 3273 and like activities
Ready Mixed Concrete
This NOI may be an application to discharge process wastewater. NCG140000 contains effluent limitations
for process wastewater discharges. Wastewater discharges must meet the requirements of these effluent
limitations. An exceedance of any of these limitations will result in a violation of the permit conditions.
For questions, contact the DEMLR Central Office or Regional Office in your area. (See page 8)
1)
(Please print or type)
Mailing address of owner/operator (official address to which all permit correspondence will be
mailed):
Legal Company Name Carolina Sunrock LLC
(Please attach the most recent Annual Report to the NC Secretary of State showing the current legal name. Alternatively
this permit can be given to an individual.)
Signee's Name (as signed for in question 28 below) Gregg Bowler
President
Street Address 200 Horizon Drive Suite 100
City Raleigh
Telephone No. 919 747-6400
Alternate ContactName Scott Martino
Alternate Contact Telephone (if different)
2) Location of facility producing discharge:
984-202-4761
State NC ZIP Code 27615
Email [e-mail]
Email (if different) [e-mail]
Facility Name Burlington North Distribution Center
Street Address 12971 NC Hwy 62
City Burlington State NC ZIP Code 27217
County Facility Caswell County
Contact Scott Martino
Telephone No. 984 202-4761 Email smartino(cDthesunrockgroup.com
3) Physical location information:
Please provide narrative directions to the facility (use street names, state road numbers, and distance and
direction from a roadway intersection). Exit 150 on 140turn right on Jimmie Kerr road (2.0 robe), turn right on NC-49 (6.6) mile to NC-62 N (4.1 rol)to destination on right.
(A copy of a county map or USGS quad sheet with facility clearly located on the map is a required part of this application.)
4) Latitude 36°14'55.7700" Longitude-079°19'41.8656" (deg., min, sec or decimal)
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NCG140000 N.O.I.
5) This NPDES Permit Application applies to the following (check all that apply):
e New or Proposed Facility Date operation is to begin —Q4 2021
❑ Existing Facility Date operation began
6) Consultant's application information:
Consultant:
Consulting Firm:
Mailing Address:
City: _
State:
Phone: L__)
Email:
Zip Code:
(Optional)
Staple Business Card Here:
7) Provide the 4 digit Standard Industrial Classification Code (SIC Code) that describes the primary
industrial activity at this facility:
SIC Code: 3 2 7 3
8) Provide a brief description of the types of industrial activities and products produced at this facility:
(Attach a site diagram showing the process areas present at this facility.)
The Facilitv Produces Hot Mix Asphalt and Readv-Mix Concrete products
Stormwater Discharge, Wastewater Treatment & Discharge and Permitting Information
9) Discharge points / Receiving waters:
What is the name of the body or bodies of water (creek, stream, river, lake, etc.) that the facility stormwater
and/or wastewater discharges will end up in? Hughes Mill Creek and an unnamed tributary of Hughes Mill Creek
To find the waterbody, please see the NC Surface Waterbody Classifications map at
https://deq.nc.gov/about/divisions/water-resources/water-resources-science-data
Receiving water classification(s) for the waters
WS-II-BW; HQW; NSW
If the site will discharge to a separate storm sewer system, name the operator of the separate storm sewer
system (e.g. City of Raleigh municipal storm sewer). No
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NCG140000 N.O.I.
List discharge points (outfalls) that convey discharge from the site (both on -site and off -site) and location
coordinates. Attach additional sheets if necessary, or note that this information is specified on the site plan.
Be sure to indicate a type for each outfall listed below as Stormwater only, Wastewater only or Wastewater
Commingled with Stormwater
Outfall No. 001 Stormwater only ❑ Wastewater only Wastewater Commingled with Stormwater
Latitude (degrees/minutes/seconds): 36*15'04.9860" N
Longitude (degrees/minutes/seconds):-079°19'31.0188" W
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
Outfall No. Stormwater only
Latitude (degrees/minutes/seconds):
Longitude (degrees/minutes/seconds):
❑ Wastewater only
❑ Wastewater only
❑ Wastewater only
❑ Wastewater only
❑ Wastewater only
❑ Wastewater only
I
W
N
W
N
W
N
W
N
W
N
W
Wastewater Commingled with Stormwater
Wastewater Commingled with Stormwater
Wastewater Commingled with Stormwater
Wastewater Commingled with Stormwater
Wastewater Commingled with Stormwater
Wastewater Commingled with Stormwater
W11 this facility discharge wastewater to SA (Shellfish) waters? ❑ Yes IF No
Note: Discharge of process wastewater to receiving waters classified as Critical Area (CA) must be
reviewed by the N.C. Division of Water Resources, Public Water Supply Section ahead of
approval. No new discharges of process wastewater are permitted in receiving waters
classified as WS-1 or freshwater ORW.
You must show all discharge points clearly on the submitted site plan. Be advised that
NCDEQ may require you to apply for an individual permit, based on proposed discharge rates
and receiving stream conditions (low flows, impairments, etc.)
Page 3 of 8
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NCG140000 N.O.I.
10) Each applicant shall provide the following information (attach additional sheets as necessary):
• Two (2) site plans depicting the facility or site with numbered outfalls which indicate stormwater and
wastewater outfalls. The plans shall legibly show. at a minimum, (existing or proposed):
o Outline of drainage areas with topographical lines and features
o Stormwater/wastewater treatment structures
o Location of numbered stormwater/wastewater outfalls (corresponding to which drainage areas)
o Runoff conveyance structures
o Areas and acreage where materials are stored
o Impervious area acreages
o Location(s) of streams and/or wetlands the site is draining to, and any applicable buffers
o Site property lines, North Arrow, and bar scale
o If applicable, the 100-year floodplain line
o Acreage of each stormwater and wastewater topographical area
0 Each of the facilities' wastewater or stormwater source and discharge structures and each of its
hazardous waste treatment, storage, or disposal facilities
0 Site location (insert)
Site plans shall be 24" x 36" in size.
• Line drawing and description: A line drawing of the water flow through the facility. A pictorial description
of the nature and amount of any sources of water and any collection and treatment measures.
• A narrative description and identification of each type of process, operation, or production area which
contributes wastewater to the effluent for each outfall, and a description of the treatment the wastewater
receives (or will receive), including the ultimate disposal of any solid or fluid wastes other than by
discharge. Processes, operations, or production areas may be described in general terms (e.g. "ash
silo").
11) Does the applicant have any unresolved Notice of Violations (NOVs)?
8 No ❑ Yes
Wastewater:
12) What types of wastewater does your facility generate or discharge?
Type of Authorized Wastewater
Generate
Discharge
Sent to WW
Treatment
System
Vehicle and equipment cleaning VE
0
0
0
Wetting of raw material stockpiles RM
IIZI
0
p
Mixing drum cleaning MD
El
✓❑
✓❑
Further explanation, If necessary: All wastewaters wi I I be collected and treated via an initial sytem of weir/filters to remove solids, followed by a PH -neutralization system.
Captured solids will be recycled into production processes.. treated process water is to be recycled within on -site production processes (ie. washing of vehicle.. or botching concrete). Process Water Weir system to overflow in excess of 10yr. storm event
13) Will your facility spray -down or actively wet aggregate piles?
❑ No Q Yes
14) Does the facility use any of the following on site?
e Phosphorus -containing Detergents a Non -Phosphorus -containing Detergents
❑ Brighteners ❑ Other Cleaning Agents ❑ Other:
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NCG140000 N.O.I.
15) Are wastewater treatment facilities planned in the 100-year flood plain?
❑ No ❑ Yes
I -
16) Will your facility build a closed -loop recycle system (CLRSs) that meets design requirements in 15A
r' NCAC 02T .1000 and hold your facilities' working volume'?
❑ Yes ✓❑ No
If Yes, STOP COMPLETION of this permit. Contact DWR Non -Discharge Permitting Program for permitting
requirements.
17) A wastewater treatment alternatives review is required by 15A NCAC 2H.0105 (c)(2) for any new or
expanding water pollution control facility's discharge in North Carolina. You may attach additional sheets.
a) What wastewaters were considered for this alternatives review? 8 VE 8 RM 0 MD
b) Connection to a Municipal or Regional Sewer Collection System:
i) Are there existing sewer lines within a one -mile radius? ..................................... ❑ Yes 01 No
(1) If Yes, will the wastewater treatment plant (WWTP) accept the wastewater? .... ❑ Yes ❑
(a) If No, please attach a letter documenting that the WWTP will not accept the wastewater.
(b) If Yes, is it feasible to connect to the WWTP? Why or why not?*
c) Surface or Subsurface Disposal System (e.g., spray irrigation):
VC
Is a surface or subsurface disposal technologically feasible (possible)? .................... El Yes 0 No
Why or Why not? Surface/subsurface disposal (e.g., spray/drip irrigation or subsurface injection systems)
would be technologically non -feasible, as there is not enough open land available at the site.
ii) Is a surface or subsurface disposal system feasible to implement?* ........................... El Yes 0 No
Why or Why not? No, due to the lack of open land that is available at the site due to the presence of equipment/structures, septic Feld,
stormwater control devices, aggregate, stockpileing areas, trucking routs,
existing on -site jurisdiction wetlands and streams and general site topography
iii) What is the feasibility of employing a subsurface or surface discharge as compared to a direct
discharge to surface waters?* A direct discharge to surface waters is considered the only feasible alternative, based on space limitations,
which prohibit the implementation of any surface or subsurface disposal technologies.
d) Direct Discharge to Surface Waters: Is discharge to surface waters the most environmentally sound
alternative of all reasonably cost-effective options of the wastewaters being considered?*... 8 Yes ❑ No
i) If No, contact DEMLR's Land Application Unit to determine permitting requirements.
e) If this review included all wastewater discharge types, would excluding some types (e.g. raw
stockpile wetting) make any of the above non -discharge options feasible? .............. ❑ Yes N No
* You may be asked to provide further information to support your answers to these questions after the initial review.
Feasibility should take into account initial and recurring costs.
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NCG140000 N.O.I.
Stormwater:
18) Does this facility employ any best management practices for Stormwater control? ❑ No p Yes
If yes, please briefly describe: structural BMPs include vegetative swales and a stormwater detention basin, secondary containment structures for bulk liquids,
closed loop process watertreatment system for mixer truck washing. Nonstructural BMPs include employee training for stonnwater pollution prevention, safe equipment/materials handling practices, and spill prevention and response.
19) Does this facility have a Stormwater Pollution Prevention Plan? ❑ No 0 Yes
If yes, when was it implemented? SWPPP & SCPP will be implemented prior to startup of facility operations
20) Are vehicle maintenance activities (VMA) occurring or planned at this facility? ❑ No ❑Yes
If yes, does your VMA area discharge into your wastewater treatment device? ❑ No ❑ Yes
Other/Permitting:
21) Does this facility have a Division of Land Resources Erosion & Sedimentation Control (E&SC) Permit?
❑ No 0 Yes
If yes, list the permit numbers for all current E&SC permits for this facility:
22) Is your facility subject to Phase 11 Post -Construction Area? p No ❑ Yes
If yes, who is the permitting authority?
23) Is your facility located in one of the 20 Coastal Counties? ❑ Yes 0 No
CASWE-2020-001, NCC205628
Is your facility adding more than 10,000 ft2 of built -upon area or CAMA Major Permit? ❑ Yes 0 No
24) Is your facility discharging wastewater (treated or untreated) such as water from wetting of aggregate piles, drum
rinse -out, or vehicle and equipment cleaning to a stormwater BMP? 0 No ❑ Yes
If yes, please attach your approval from the permitting authority to do so.
25) Does this facility have any other NPDES permits? p No ❑ Yes
If yes, list the permit numbers for all current NPDES permits for this facility:
26) Does this facility have any Non -Discharge permits (ex: recycle permits)? p No [—]Yes
If yes, list the permit numbers for all current Non -Discharge permits for this facility:
27) Hazardous Waste:
a) Is this facility a Hazardous Waste Treatment, Storage, or Disposal Facility?
❑✓ No ❑ Yes
b) Is this facility a Small Quantity Generator (less than 1000 kg. of hazardous waste generated per month) of
hazardous waste?
✓❑ No ❑Yes
c) Is this facility a Large Quantity Generator (1000 kg. or more of hazardous waste generated per month) of
hazardous waste?
✓❑ No ❑ Yes
d) Type(s) of waste:
How 1s material stored: There are no treatment, storage, or disposal of hazardous waste.
Where is material stored:
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NCG140000 N.O.I.
How many disposal shipments per year:
Name of transport / disposal vendor:
Vendor address:
Final Checklist
This application will be returned as incomplete unless all of the following items have been included:
❑ Check for $100 made payable to NCDEQ.
J&jf ❑ This completed application and all supporting documentation. See Question 10.
❑ If an Erosion & Sedimentation Control (E&SC) Plan is required from Division of Land Resources (DLR) or
local designee: documentation verifying applicant has developed and submitted that Plan to the governing
agency (required per 15A NCAC 02H .0138).
r ❑ Two (2) site plans depicting the site plan with numbered outfalls which indicate stormwater and wastewater
outfalls. See Question 10.
❑ A county map or USGS quad sheet with location of facility clearly marked.
28) Signatory Requirements (per 40 CFR 122.22)
All applications, reports, or information submitted to the Director shall be signed and certified.
a. All notices of intent to be covered under this General Permit shall be signed as follows:
(1) For a corporation: by a responsible corporate officer. For the purpose of this permit, a responsible corporate officer means: (a) a
president, secretary, treasurer or vice president of the corporation in charge of a principal business function, or any other person who
performs similar policy or decision making functions for the corporation, or (b) the manager of one or more manufacturing production or
operating facilities employing more than 250 persons or having gross annual sales or expenditures exceeding 25 million (in second quarter
1980 dollars), if authority to sign documents has been assigned or delegated to the manager in accordance with corporate procedures.
(2) For a partnership or sole proprietorship: by a general partner or the proprietor, respectively; or
(3) For a municipality, state, federal, or other public agency: by either a principal executive officer or ranking elected
official.
Certification: North Carolina General Statute 143-215.6 B(i) provides that:
Any person who knowingly makes any false statement, representation, or certification in any application, record, report, plan, or other
document filed or required to be maintained under this Article or a rule implementing this Article; or who knowingly makes a false statement of
a material fact in a rulemaking proceeding or contested case under this Article; or who falsifies, tampers with, or knowingly renders inaccurate
any recording or monitoring device or method required to be operated or maintained under this Article or rules of the [Environmental
Management] Commission implementing this Article shall be guilty of a Class 2 misdemeanor which may include a fine not to exceed ten
thousand dollars ($10,000).
I hereby request coverage under the referenced General Permit. I understand that coverage under this permit will
constitute the permit requirements for the discharge(s) and is enforceable in the same manner as an individual
permit.
I certify that I am familiar with the information contained in this application and that to the best of my knowledge
and belief such information is true, complete, and accurate.
Printed Name of Person Signing: Gregg Bowler
Title: Preside
(Signature of AVplicant)
/2 - // - 2azo
(Date Signed)
Page 7 of 8
SWU-NCG14-NOI Last revised 8/01/2017

NCG140000 N.O.I.
Notice of Intent must be accompanied by a check or money order for $100.00 made payable to: NCDEQ
Mail the entire package to:
DEMLR - Stormwater Program
Dept. of Environmental Quality
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
Note
The submission of this document does not guarantee the issuance of an NPDES permit.
For questions, please contact the DEMLR Regional Office for your area.
DEMLR Regional Office Contact Information:
Asheville Office ......
[phone]
Fayetteville Office ...
[phone]
Mooresville Office ...
[phone]
Raleigh Office ........
[phone]
Washington Office ...
[phone]
Wilmington Office ...
[phone]
Winston-Salem ......
[phone]
Central Office .........
[phone]
Page 8 of 8
SWU-NCG14-NOI Last revised 8/01/2017

NCG140000 NOI
Carolina Sunrock — Burlington North
Distribution Center
December 11, 2020
NPDES1000 APPROVAL

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
BRIAN WRENN
Director
Caswell Properties, LLC
ATTN: Gregg Bowler, COO
200 Horizon Dr., Suite 100
Raleigh, NC 27615
t
.�"'Z n- *0<
NORTH CAROLINA
Environmental Quality
November 18, 2020
LETTER OF APPROVAL
RE: Project Name: Carolina Sunrock LLC - Burlington North
Acres Approved: 22.2
Project ID: CASWE-2020-001
County: Caswell
City: Anderson
Address: NC HWY 62
River Basin: Cape Fear
Stream Classification: WS-II; HQW, NSW - Jordan Lake Watershed
Submitted By: Timmons Group
Date Received by LQS: November 4, 2020
Plan Type: Revised
Dear Sir or Madam:
This office has reviewed the subject erosion and sedimentation control plan. We find the plan to
be acceptable and hereby issue this Letter of Approval. This plan approval shall expire three (3)
years following the date of approval, if no land -disturbing activity has been undertaken, as is
required by Title 15A NCAC 413.0129.
As of April 1, 2019, all new construction activities are required to complete and submit an
electronic Notice of Intent (eNOI) form requesting a Certificate of Coverage (COC) under the
NCGO10000 Construction General Permit. After the form is reviewed and found to be complete,
you will receive a link with payment instructions for the $100 annual permit fee. After the fee is
received, you will receive the COC via email. You MUST obtain the COC prior to commencement
of any land disturbing activity. The eNOI form may be accessed at deq.nc.gov/NCG01. Please
direct questions about the eNOI form to Annette Lucas at [e-mail] or Paul
Clark at [e-mail]. If the owner/operator of this project changes in the future, the
new responsible party is required to apply for his/her own COC.
D North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Winston-Salem Regional Office 1 450 Hanes Mill Road Suite 3001 Winston-Salem, North Carolina 27103
^+rv� 336.776.9800

Letter of Approval
Caswell Properties, LLC
November 18, 2020
Page 2 of 2
Title 15A NCAC 413.0118(a) and the NCG01 permit require that the following documentation be
kept on file at the job site:
1. The approved E&SC plan as well as any approved deviation.
2. The NCG01 permit and the COC, once it is received.
3. Records of inspections made during the previous 12 months.
Also, this letter gives the notice required by G.S. 113A-61.1(a) of our right of periodic inspection
to ensure compliance with the approved plan.
North Carolina's Sedimentation Pollution Control Program is performance -oriented, requiring
protection of existing natural resources and adjoining properties. If, following the
commencement of this project, it is determined that the erosion and sedimentation control plan
is inadequate to meet the requirements of the Sedimentation Pollution Control Act of 1973
(North Carolina General Statute 113A-51 through 66), this office may require revisions to the
plan and implementation of the revisions to ensure compliance with the Act.
Acceptance and approval of this plan is conditioned upon your compliance with Federal and State
water quality laws, regulations, and rules. In addition, local city or county ordinances or rules
may also apply to this land -disturbing activity. This approval does not supersede any other
permit or approval.
Please note that this approval is based in part on the accuracy of the information provided in the
Financial Responsibility Form, which you provided. This permit allows for a land -disturbance,
as called for on the application plan, not to exceed the approved acres. Exceeding the acreage
will be a violation of this permit and would require a revised plan and additional application fee.
You are requested to file an amended form if there is any change in the information included on
the form. In addition, it would be helpful if you notify this office of the proposed starting date for
this project. Your cooperation is appreciated.
Si cerely,
Z cha y ntz, EI
Assistant Regional Engineer
Land Quality Section
Enclosures: Certificate of Approval
NCG01 Fact Sheet
cc: Timmons Group
ATTN: Rick Baker
5410 Trinity Rd., Suite 102
Raleigh, NC 27607
WSRO file

Certificate of Coverage
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENTAL QUALITY
DIVISION OF ENERGY, MINERAL, AND LAND RESOURCES
GENERAL PERMIT NO. NCG010000
NC Reference No. NCG01-2020-5628
Certificate of Coverage No. NCC205628
STORMWATER DISCHARGES
NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM
In compliance with the provision of North Carolina General Statute 143-215.1, other lawful standards and regulations
promulgated and adopted by the North Carolina Environmental Management Commission, and the Federal Water
Pollution Control Act, as amended,
Caswell Properties, LLC
is hereby authorized to discharge stormwater associated with CONSTRUCTION ACTIVITIES to surface waters of North
Carolina from a site located at:
Carolina Sunrock LLC - Burlington North
12971 NC Hwy 62
Burlington
Caswell County
in accordance with the effluent limitations, monitoring requirements, and other conditions set forth in N.C. General Permit
No. NCG010000.
This Certificate of Coverage is affiliated with E&SC Plan Project No. CASWE-2020-001
This Certificate of Coverage shall become effective 12/8/2020.
This Certificate of Coverage shall remain in effect until rescinded or expired.
This Certificate of Coverage will expire on the anniversary of its effective date unless it is renewed by payment of the
annual administration and compliance fee.
for Brian Wrenn
Director, Division of Energy, Mineral, and Land Resources
By the Authority of the Environmental Management Commission

NCG140000 NOI
Carolina Sunrock — Burlington North
Distribution Center
December 11, 2020
APPROVED PLAN SET

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NCG140000 NOI
Carolina Sunrock — Burlington North
Distribution Center
December 11, 2020
APPROVED
Sediment &Erosion
Control Report

TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS.
Sediment & Erosion Control Report
Project:
4/24/2020
Carolina Sunrock LLC —
Burlington North Asphalt Plant
12971 NC Hwy 62
Burlington, Caswell County, NC 27217
SS/
A -
25
Q� REVISIONS:
W.
l 1111 0,
Timmons Group
5410 Trinity Road, Suite 102
Raleigh, NC 27607
[phone]
[e-mail]
■

Table of Contents
Sediment & Erosion Control Narrative
a. Existing Conditions Description
b. Erosion Control Summary
c. NPDES/NCGO1 Plan
2. Sediment & Erosion Control Calculations
a. Sediment Basin Design
b. Temporary Diversion Ditch Sizing/Liner Calculations
c. Rainfall Data
i. NOAA IDF Table
ii. NCDEQ Runoff Coefficient Table
3. Maps
a. NRCS Soil Survey Map
b. USGS Map
c. NCDEQ DWR Surface Water Classification Map
d. FEMA FIRM Maps

Sediment & Erosion Control Narrative

Sediment & Erosion Control Narrative
Existing Conditions Description
The proposed hot -mixed asphalt plant project is located at 12971 NC Hwy 62 in Burlington,
Caswell County, NC. The parcel identification number is 0090 027. The site consists of
approximately 84.2 acres of mainly agricultural fields and wooded land. Hughes Mill Creek runs
along the northern property line. There are two existing pond within the site, one jurisdictional
subject to a 70' vegetative buffer and one non jurisdictional. The existing soils are Helena sandy
loam "HeB / HeC / HeD" in Hydrologic Soils Group "D," Chewacla loam "ChA" in Hydrologic
Soils Group B/D, and Rowan -Poindexter complex "RxE" in Hydrologic Soils Group `B." The
majority of the site drains north toward Hughes Mill Creek in the Stoney Creek Balance and Jordan
Lake watersheds. The surface water classification is WS-11-BW; HQW; NSW. FIRM Panels
3710990100J and 3710990000L indicate that the property does lie within a special flood hazard
area; however, the project site does not.
Erosion Control Summary
This project proposes a hot -mixed asphalt and concrete plant facilities, a new building and
associated parking. Approximately 24.0 acres of land will be disturbed. Two temporary sediment
basins will be installed to treat the majority of the disturbed area. The remainder of the project
site will be protected by silt fence and silt fence stone outlets. At the completion of construction,
both sediment basins will be removed, and the site will be seeded to create a good stand of grass.
Erosion control measures for this site have been designed in accordance with NCDEQ standards
and specifications.
NPDES/NCGO1 Plan
The site has been designed to comply with NCDEQ NPDES Guidelines. A NCGO1 permit will
be obtained upon NCDEQ Erosion Control approval.

Sediment & Erosion Control Calculations

BASIN #2 '! • •Burlington North
• : TIMMONS GROUP •••
April Blye ENGINEERING I DESIGN I TECHNOLOGY 44089.002
Sediment Basin Design
Disturbed Area:
12.10 ac
Additional Drainage Area:
0.00 ac
Total Drainage Area:
12.10 ac
Runoff Coeff [Cc]:
0.45
25-yr Rainfall Intensity [I]:
7.67 in/hr
25-yr Discharge [Q25]:
41.76 cfs
21780 Required Volume ft3 (Disturbed Area x 1800 cf/ac)
18167 Required Surface Area ft2 (Q25 x 435)
95.3 Suggested Width ft
1906,Suggested Length ft
70 Width at Surface Area (ft)
322 Length at Surface Area (ft) L/W Ratio = 4.6
3 Side Slope Ratio Z:1
2 Depth (ft)
58 Target Bottom Width (ft)
310 Target Bottom Length (ft)
17980 Target Bottom Area (ft2)
40472 Target Volume (ft) Okay
22540 Target Surface Area (ft) Okay
34746 Provided Volume (ft)
19461 Provided Surface Area (ft)
Skimmer Size
45 Emergency Spillway Width (ft)
Inches
0.5 Depth of Flow (ft)
1.5
47.7 Spillway Capacity (cfs) Okay
2
2.5
2.5 Skimmer Size (in)
3
0.208 Head on Skimmer (ft)
4
2.25 Orifice Size (1/4 inch increments)
5
4.08 Dewatering Time (days)
6
Suggest about 3 days
8
Okay
Elevation Area(sf) Depth(ft) Incr. Vol. (cf) Cumulative
Volume 634.00 15313 0.00 0 0
635.00 17359 1.00 16336 16336
636.00 19461 2.00 18410 34746
Top of Embankment Elevation:
638.00 ft
Emergency Spillway Elevation:
637.00 ft
Embankment Width:
loft
Riser Elevation:
636.00 ft
Bottom Elevation:
634.00 ft
Sediment Storage Elevation:
633.00 ft
12 Barrel Size (in)
45 Barrel Length (LF)
633.5 Upstream Barrel Invert Elevation
630.5 Downstream Barrel Invert Elevation
6.67% Slope of Barrel (%)
HDPE Barrel Pipe Material
CMP Riser Material
18 Riser Size (in) Okay (Riser = 1.5 Barrel Size)
1.5 Riser Diameter (ft)
3.0 Height (ft)
Area Riser x Ht Riser x Density Water x Safety Factor
380 Buoyant Force (lbs)
(,25)(pi)(Diameter)2 x (Height) x 62.4 pcf x 1.15 FS
2.5 Volume Required (cf)
Buoyant force / Density Of Concrete (150 pcf)
1.6 Square Root of Volume (ft)
(Assume 1 ft thick concrete footing)
2.0 Length of Concrete Footing
2.0 Width of Concrete Footing
1.0 Height of Concrete Footing (Thickness)
4 Volume Provided (cf)
*RED IS USER INPUT
LATEST REVISION: 4/24/2020 8:42 AM

i&*so&a -•
BASIN#1 a a -Burlington North
- TIMMONS GROUP noff•-•
Sol Rios Moore ENGINEERING I DESIGN I TECHNOLOGY 44089.002
Sediment Basin Design
Basin Name: BASIN #1 TYPE OF BASIN: SKIMMER
Disturbed Area: 3.21 ac
Additional Drainage Area: 0.00 ac
Total Drainage Area: 3.21 ac
Runoff Coeff [Cc]: 0.45
25-yr Rainfall Intensity [I]: 7.67 in/hr
25-yr Discharge [Q25]: 11.08 cfs
Sizing. Basin
5778 Required Volume ft3 (Disturbed Area x 1800 cf/ac)
3601 Required Surface Area ft2
42.4 Suggested Width ft
84.9 Suggested Length ft
43 Width at Surface Area (ft)
86 Length at Surface Area (ft)
3 Side Slope Ratio Z:1
2 Depth (ft)
31 Target Bottom Width (ft)
74 Target Bottom Length (ft)
2294 Target Bottom Area (ft2)
5944 Target Volume (ft) Okay
3698 Target Surface Area (ft) Okay
6233 Provided Volume (ft)
3782 Provided Surface Area (ft)
15 Emergency Spillway Width (ft)
0.5 Depth of Flow (ft)
15.9 Spillway Capacity (cfs) Okay
2 Skimmer Size (in)
0.167 Head on Skimmer (ft)
1.25 Orifice Size (1/4 inch increments)
3.92 Dewatering Time (days)
Suggest about 3 days
L/W Ratio = 2.0
Skimmer Size
(Inches)
1.5
2
2.5
3
4
5
6
8
Okay
668.00 2479 0.00 0 0
669.00 3102 1.00 2791 2791
670.00 3782 2.00 3442 6233
Top of Embankment Elevation:
Emergency Spillway Elevation:
Embankment Width:
Bottom Elevation:
Sediment Storage Elevation:
671.00 ft
670.00 ft
ft
668.00 ft
667.00 ft
LATEST REVISION: 4/24/2020 8:39 AM

• �' Burlington North
TIMMONS GROUP
April Blye
Time of Concentration Calculation
Modified Rational
Highest Elevation =
feet
Inlet Elevation =
feet
Difference =
56 feet
Travel Length =
1,. feet
Tc =
Lf 3 / H)0.385
Equation 2.3 Kirpich Equation
128
Where
Tc =Time of Concentration (min)
H =Height of the most remote point on the watershed above
the outlet (ft)
L =Length of flow from the most remote point on the
watershed to the outlet (ft)
(Civil Engineering, Vol. 10, No. 6,June 1940,p.362.)
A graph of the Kirpich Equation also appears in Figure 2.4.
Tc = 6.90
min
Tc =
min
Intensity 25 year =
in/hr
C=
Disturbed Area =
acres
Additional Drainage Area =
acres
Total Drainage Area= 12.10
acres
Equation 2.1 Rational Equation 0 = C I A
*RED IS USER INPUT
Where:
Q = Peak flow from the drainage area (cfs)
C = Coefficient of runoff (dimensionless)
I = Rainfall intensity for a given time to peak (in/hr)
A = Drainage area (acres)
Q25 = 41.76 cfs
LATEST REVISION: 4/24/2020 8:42 AM

BASIN #2 '! • •Burlington North
• : TIMMONS GROUP •••
April Blye ENGINEERING I DESIGN I TECHNOLOGY 44089.002
Sediment Basin Design
Disturbed Area:
12.10 ac
Additional Drainage Area:
0.00 ac
Total Drainage Area:
12.10 ac
Runoff Coeff [Cc]:
0.45
25-yr Rainfall Intensity [I]:
7.67 in/hr
25-yr Discharge [Q25]:
41.76 cfs
21780 Required Volume ft3 (Disturbed Area x 1800 cf/ac)
18167 Required Surface Area ft2 (Q25 x 435)
95.3 Suggested Width ft
1906,Suggested Length ft
70 Width at Surface Area (ft)
322 Length at Surface Area (ft) L/W Ratio = 4.6
3 Side Slope Ratio Z:1
2 Depth (ft)
58 Target Bottom Width (ft)
310 Target Bottom Length (ft)
17980 Target Bottom Area (ft2)
40472 Target Volume (ft) Okay
22540 Target Surface Area (ft) Okay
34746 Provided Volume (ft)
19461 Provided Surface Area (ft)
Skimmer Size
45 Emergency Spillway Width (ft)
Inches
0.5 Depth of Flow (ft)
1.5
47.7 Spillway Capacity (cfs) Okay
2
2.5
2.5 Skimmer Size (in)
3
0.208 Head on Skimmer (ft)
4
2.25 Orifice Size (1/4 inch increments)
5
4.08 Dewatering Time (days)
6
Suggest about 3 days
8
Okay
Elevation Area(sf) Depth(ft) Incr. Vol. (cf) Cumulative
Volume 634.00 15313 0.00 0 0
635.00 17359 1.00 16336 16336
636.00 19461 2.00 18410 34746
Top of Embankment Elevation:
638.00 ft
Emergency Spillway Elevation:
637.00 ft
Embankment Width:
loft
Riser Elevation:
636.00 ft
Bottom Elevation:
634.00 ft
Sediment Storage Elevation:
633.00 ft
12 Barrel Size (in)
45 Barrel Length (LF)
633.5 Upstream Barrel Invert Elevation
630.5 Downstream Barrel Invert Elevation
6.67% Slope of Barrel (%)
HDPE Barrel Pipe Material
CMP Riser Material
18 Riser Size (in) Okay (Riser = 1.5 Barrel Size)
1.5 Riser Diameter (ft)
3.0 Height (ft)
Area Riser x Ht Riser x Density Water x Safety Factor
380 Buoyant Force (lbs)
(,25)(pi)(Diameter)2 x (Height) x 62.4 pcf x 1.15 FS
2.5 Volume Required (cf)
Buoyant force / Density Of Concrete (150 pcf)
1.6 Square Root of Volume (ft)
(Assume 1 ft thick concrete footing)
2.0 Length of Concrete Footing
2.0 Width of Concrete Footing
1.0 Height of Concrete Footing (Thickness)
4 Volume Provided (cf)
*RED IS USER INPUT
LATEST REVISION: 4/24/2020 8:42 AM

% . Burlington North
' TIMMONS GROUP I I I E'T.'
Sol Rios Moore ENGINEERING I DESLGN I TECHNOLOGY 44089.002
Ditch Outlet Protection (NYDOT Method)
Name:Ditch - ,
Velocity = 3.97 fps From Fig. 8.06.c: ZONE _
Top Width = 8.4 ft
Ditch Area = 2.43 sf Rip Rap Class = A
Equivalent Pipe Diameter = 21.11 in Apron Thickness = 12 in
Equivalent Pipe Diameter = 24 in Apron Length = 8.0 ft
Apron Width = Top Width.= 8.4 ft
From Fig. 8.06.e:
LATEST REVISION: 3/4/2020 10:07 AM

Diversion Ditch #1 t Burlington North
Sol Rios Moore T I M M O N S GROUP 44089 002
ENGINEERING I DESIGN I TECHNOLOGY
Drainage Ditch Design (Velocity Constraint)
TEMPORARY•
This worksheet is designed to determine channel lining based on flow and ditch geometry (base width, side
slope, & channel slope). This program determines depth of flow, velocity and tractive force assuming n=0.03
for grass or rip rap (n can be varied if desired). (Vary depth until z actual equals z required; v & t will be
correct; select appropriate lining based on tractive force)
Area (A) = 2.37 (Acres)
Coef. (C) = 0.46 (Dimensionless)
Inte. (1) = 7.67 (in/hr)
Flow (Q10) = 8.2 (cfs)
Line channel with:
6 " rip -rap
(Assume 6" even if using grass)
Manning n =
0.030 (Dimensionless) Ditch Length = 602 LF
Slope =
0.020 (ft/ft)
Highest Elevation = 680
Z Required =
1.17 Ratio
Lowest Elevation = 670
Side Slope (M) =
3 :1
QuantitiesVariable
Flow Depth (Y) =
(DitchDepth)
0.90 ft
10.8 in
Bottom Width (B) =
0.00 ft
0.0 in
Freeboard =
Compute Tractive
0.60 ft
Force
6.0 in
T=YxDxS
Y = Weight of water (62.4 LB/CUFT)
T =
1.12 LB/SF
D=Depth of flow in channel (ft)
S=Slope of channel (ft/ft)
Jute Net
0.45
Curled Mat
1.55
Class A (4"@9"THK)
2.00
7
Class B (8"@18"THK)
3.50
Class I (12"@22"THK)
5.00
Class II 18" 30"THK
7.50
North American
iGreen Lining
S 75
1.55
S150
1.75
SC150
2.10
C 125
2.25
P300
8.00
NewA= 2.43 SF
New P = 5.69 Wetted perimeter
New R = 0.43 Hydraulic radius
Z Actual = 1.38 Must be greater than z required=> 1.17 Okay
New V = 3.97 fps
Minimum Design Geometry
Liner: North American Green, S76 1.66 LB/SF > 1.12 LB/SF Okay
Top Width = 8A ft
Min. Ditch Depth 1.4 ft
3 Flow Depth (Y) = 0.9 ft
1
Bottom Width (B) = 0 ft
Min. Ditch Depth (ft) Bottom Width (ft) Flow Depth (ft) Top Width (ft) ISide Slope
1.40 0.00 0.90 8.4 1 3:1
North American Green, S75 I "RED IS USER INPUT
�_� � x.� � :7 ��/ [.9 [•] � 1 [c1L !f ���Y��7i Nl NI:�_1 ��i

% . Burlington North
' TIMMONS GROUP I I I E'T.'
Sol Rios Moore ENGINEERING I DESLGN I TECHNOLOGY 44089.002
Ditch Outlet Protection (NYDOT Method)
Name:Ditch Diversion
Velocity =
6.22 fps
From Fig. 8.06.c: ZONE _
Top Width =
9.4 ft
Ditch Area =
3.33 sf
Rip Rap Class = B
Equivalent Pipe Diameter =
24.71 in
Apron Thickness = 18 in
Equivalent Pipe Diameter =
30 in
Apron Length = 15.0 ft
Apron Width = Top Width.= 9.4 ft
From Fig. 8.06.e:
LATEST REVISION: 3/4/2020 11:13 AM

Diversion Ditch #2A t Burlington North
Sol Rios Moore T I M M O N S GROUP 44089 002
ENGINEERING I DESIGN I TECHNOLOGY
Drainage Ditch Design (Velocity Constraint)
TEMPORARY•
This worksheet is designed to determine channel lining based on flow and ditch geometry (base width, side
slope, & channel slope). This program determines depth of flow, velocity and tractive force assuming n=0.03
for grass or rip rap (n can be varied if desired). (Vary depth until z actual equals z required; v & t will be
correct; select appropriate lining based on tractive force)
Area (A) = 4.66 (Acres)
Coef. (C) = 0.46 (Dimensionless)
Inte. (1) = 7.67 (in/hr)
Flow (Q10) = 16.1 (cfs)
Line channel with:
6 " rip -rap
(Assume 6" even if using grass)
Manning n =
0.030 (Dimensionless) Ditch Length = 1106 LF
Slope =
0.040 (ft/ft)
Highest Elevation = 680
Z Required =
1.62 Ratio
Lowest Elevation = 636
Side Slope (M) =
3 :1
QuantitiesVariable
Flow Depth (Y) =
(DitchDepth)
0.90 ft
10.8 in
Bottom Width (B) =
1.00 ft
12.0 in
Freeboard =
Compute Tractive
0.60 ft
Force
6.0 in
T=YxDxS
Y = Weight of water (62.4 LB/CUFT)
T =
2.24 LB/SF
D=Depth of flow in channel (ft)
S=Slope of channel (ft/ft)
LcT4 i =-- III Zyk-11 North American
Jute Net 0.45 iGreen Lining
Curled Mat 1.55 S75 1.55
Class A (4"@9'THK) 2.00 S150 1.75
Class B (8"@18'THK) 3.50 SC150 2.10
Class I (12"@22"THK) 5.007 C125 2.25
Class II (18"030"THK) 7.50 P300 8.00
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NewA= 3.33 SF
New P = 6.69 Wetted perimeter
New R = 0.50 Hydraulic radius
Z Actual = 2.09 Must be greater than z required=> 1.62 Okay
New V = 6.22 fps
Minimum Design Geometry
Liner: North American Green, C126 2.26 LB/SF > 2.24 LB/SF Okay
Top Width = 9A ft
Min. Ditch Depth 1.4 ft
3 Flow Depth (Y) = 0.9 ft
1
Bottom Width (B) = 1 ft
Min. Ditch Depth (ft) Bottom Width (ft) Flow Depth (ft) Top Width (ft) ISide Slope
1.40 1.00 0.90 9.4 1 3:1
North American Green, C125 "RED IS USER INPUT
I�_��x.��:7��/[.9[•]�1[c1Llf���Y��7dilfif��_1��iI

% . Burlington North
' TIMMONS GROUP I I I E'T.'
Sol Rios Moore ENGINEERING I DESLGN I TECHNOLOGY 44089.002
Ditch Outlet Protection (NYDOT Method)
Name:Ditch - ,
Velocity =
5.86 fps
From Fig. 8.06.c: ZONE _
Top Width =
8.8 ft
Ditch Area =
2.72 sf
Rip Rap Class = B
Equivalent Pipe Diameter =
22.33 in
Apron Thickness = 18 in
Equivalent Pipe Diameter =
24 in
Apron Length = 12.0 ft
Apron Width = Top Width.= 8.8 ft
From Fig. 8.06.e:
LATEST REVISION: 3/4/2020 11:22 AM

Diversion Ditch #213 - 4D 0 Burlington North
Sol Rios Moore T I M M O N S GROUP -• 44089 002
ENGINEERING I DESIGN I TECHNOLOGY
Drainage Ditch Design (Velocity Constraint)
TEMPORARY•
This worksheet is designed to determine channel lining based on flow and ditch geometry (base width, side
slope, & channel slope). This program determines depth of flow, velocity and tractive force assuming n=0.03
for grass or rip rap (n can be varied if desired). (Vary depth until z actual equals z required; v & t will be
correct; select appropriate lining based on tractive force)
Area (A) = 4.32 (Acres)
Coef. (C) = 0.46 (Dimensionless)
Inte. (1) = 7.67 (in/hr)
Flow (Q10) = 14.9 (cfs)
Line channel with:
6 " rip -rap
(Assume 6" even if using grass)
Manning n =
0.030 (Dimensionless) Ditch Length = 717 LF
Slope =
0.040 (ft/ft)
Highest Elevation = 666
Z Required =
1.49 Ratio
Lowest Elevation = 636
Side Slope (M) =
3 :1
QuantitiesVariable
Flow Depth (Y) =
(DitchDepth)
0.80 ft
9.6 in
Bottom Width (B) =
1.00 ft
12.0 in
Freeboard =
Compute Tractive
0.60 ft
Force
6.0 in
T=YxDxS
Y = Weight of water (62.4 LB/CUFT)
T =
2.02 LB/SF
D=Depth of flow in channel (ft)
S=Slope of channel (ft/ft)
Lcl4m =-- III Zyk-11 North American
Jute Net 0.45 iGreen Lining
Curled Mat 1.55 S75 1.55
Class A (4"@9'THK) 2.00 S150 1.75
Class B (8"@18'THK) 3.50 SC150 2.10
Class I (12"@22"THK) 5.007 C125 2.25
Class II (18"030"THK) 7.50 P300 8.00
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NewA= 2.72 SF
New P = 6.06 Wetted perimeter
New R = 0.45 Hydraulic radius
Z Actual = 1.69 Must be greater than z required=> 1.49 Okay
New V = 5.86 fps
Minimum Design Geometry
Liner: North American Green, SC160 2.10 LB/SF > 2.02 LB/SF Okay
Top Width = 8.8 ft
Min. Ditch Depth 1.3 ft
3 Flow Depth (Y) = 0.8 ft
1
Bottom Width (B) = 1 ft
Min. Ditch Depth (ft) Bottom Width (ft) Flow Depth (ft) Top Width (ft) ISide Slope
1.30 1.00 0.80 8.8 1 3:1
North American Green, SC150 "RED IS USER INPUT
I�_��x.��:7��/[.9[•]�1[c1Llf���Y��7diW��_1��iI

Precipitation Frequency Data Server
Page 1 of 4
NOAA Atlas 14, Volume 2, Version 3
' Location name: Burlington, North Carolina, USA"
Latitude: 36.2473°, Longitude:-79.3271°
Elevation: 687.18 ft-
* source: ESRI Maps
** 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/hour)'
Average
recurrence interval (years)
Duration
1
2
5
10
25
50
1 100
00
200
500
1000
5.47
6.40
7.00
8.09
8.47
8.77
9.08
-9.28
5-min
(4.20-5.0-5.03)
(5.02-5.99)
(5.83-6.98)
(6.38-7.63)
(6.96-8.35)
(7.31-8.81)
(7.63-9.23)
(7.86-9.58)
(8.08-9.92)
(8.18-1-10.1)
10-min
3.68
4.37
5.12
5.59
6.11
6.44
6.73
6.95
7.18
7.31
(3.36-4.01)
(4.01-4.79)
(4.67-5.59)
(5.11-6.10)
(5.54-6.65)
(5.83-7.02)
(6.06-7.34)
(6.23-7.59)
(6.38-7.84)
3.06
3.67
4.32
4.72
5.16
5.44
5.67
5.85
6.03
6.12
15-min
(2.80-3.35)
(3.36-4.01)
(3.94-4.71)
(4.30-5.14)
(4.69-5.62)
(4.92-5.92)
(5.11-6.18)
(5.24-6.38)
(5.36-6.58)
(5.39-6.68)
30-min
2.10
2.53
3.07
3.42
3.82
4.09
4.34
4.55
4.80
4.95
(1.92-2.29)
1 (2.32-2.77)
1 (2.80-3.35)
1 (3.12-3.73)
1 (3.47-4.17)
1 (3.70-4.46)
1 (3.91-4.73)
1 (4.08-4.97)
1 (4.26-5.24)
(4.36-5.41)
1.31
1.59
1.97
2.23
2.55
2.77
2.99
3.19
3.44
3.61
60-min
(1.20-1.43)
1 (1.46-1.74)
1 (1.79-2.15)
1 (2.03-2.43)
1 (2.31-2.77)
1 (2.51-3.02)
1 (2.69-3.26)
(2.86-3.49)
(3.06-3.76)
(3.19-3.95)
0.775 IF
0.940 IF
1.17
1.34
1.56
1.72
1.88
2.03
2.23
2.38
2-hr
(0.710-0.846)
(0.862-1.03)
1 (1.07-1.28)
1 (1.22-1.46)
1 (1.41-1.69)
1 (1.55-1.86)
1 (1.68-2.04)
(1.81-2.20)
(1.96-2.42)
(2.07-2.58)
0.554
0.672
0.837
0.960
1.12
1.23
1.35
1.46
1.61
1.72
3-hr
(0.509-0.602)
(0.619-0.732)
(0.769-0.911)
(0.879-1.04)
1 (1.12-1.34) 11
(1.21-1.46)
1 (1.31-1.58)
1 (1.42-1.74)
1 (1.50-1.86)
0.338
0.409
0.510
0.587
0.690
0.771
0.853
0.935
1.05
1.14
6-hr
(0.312-0.370)
(0.378-0.447)
(0.469-0.556)
(0.538-0.638)
(0.628-0.748)
(0.696-0.835)
(0.764-0.923)
(0.829-1.01)
(0.915-1.13)
(0.978-1.23)
0.201
0.243
0.305
0.353
0.421
0.475
0.532
0.591
0.674
0.741
12-hr
(0.185-0.220)
(0.224-0.266)
(0.279-0.333)
(0.323-0.385)
(0.381-0.457)
(0.427-0.514)
(0.473-0.574)
(0.519-0.637)
(0.582-0.727)
(0.628-0.799)
0.119
0.143
0.179
0.207
0.246
0.277
0.308
0.341
0.387
0.424
24-h r
(0.110-0.128)
(0.133-0.155)
(0.166-0.193)
(0.192-0.223)
(0.227-0.265)
(0.254-0.298)
(0.282-0.333)
(0.311-0.370)
(0.350-0.420)
(0.380-0.461)
0.070
0.084
0.104
0.119
0.140
0.156
0.173
0.190
0.213
0.232
2-day
(0.065-0.075)
(0.078-0.090)
(0.097-0.112)
(0.111-0.128)
(0.130-0.150)
(0.144-0.168)
(0.159-0.187)
(0.174-0.206)
(0.194-0.232)
(0.210-0.253)
0.049
0.059
0.073
0.084
0.098
0.110
0.121
0.134
0.150
0.163
3-day
(0.046-0.053)
(0.055-0.063)
(0.068-0.078)
(0.078-0.090)
(0.091-0.105)
(0.101-0.118)
(0.112-0.131)
(0.122-0.144)
(0.137-0.163)
(0.148-0.178)
0.039
0.046
0.057
0.066
0.077
0.086
0.096
0.105
0.119
0.129
4-day
(0.036-0.042)
(0.043-0.050)
(0.053-0.061)
(0.061-0.070)
(0.072-0.083)
(0.080-0.093)
(0.088-0.103)
(0.096-0.114)
(0.108-0.129)
(0.117-0.140)
0.025
0.030
0.037
0.042
0.049
0.055
0.061
0.066
0.075
0.081
7-day
(0.024-0.027)
(0.028-0.032)
(0.035-0.039)
(0.039-0.045)
(0.046-0.052)
(0.051-0.059)
(0.056-0.065)
(0.061-0.071)
(0.068-0.080)
(0.074-0.088)
0.020
0.024
0.029
0.033
0.038
0.042
0.046
0.050
0.056
0.061
10-day
(0.019-0.021)
(0.022-0.025)
(0.027-0.031)
(0.031-0.035)
(0.035-0.040)
(0.039-0.045)
(0.043-0.049)
(0.047-0.054)
(0.052-0.061)
(0.056-0.066)
0.013
0.016
0.019
0.021
0.024
0.027
0.029
0.032
0.036
0.038
20-day
(0.013-0.014)
(0.015-0.017)
(0.018-0.020)
(0.020-0.022)
(0.023-0.026)
(0.025-0.029)
(0.027-0.031)
(0.030-0.034)
(0.033-0.038)
(0.035-0.041)
0.011
0.013
0.015
0.017
0.019
0.021
0.022
0.024
0.026
0.028
30-day
(0.011-0.012)
(0.012-0.014)
(0.014-0.016)
(0.016-0.018)
(0.018-0.020)
(0.020-0.022)
(0.021-0.024)
(0.022-0.026)
(0.024-0.028)
(0.026-0.030)
0.009
0.011
0.013
0.014
0.016
0.017
0.018
0.019
0.021
0.022
45-day
(0.009-0.010)
(0.010-0.012)
(0.012-0.013)
(0.013-0.015)
(0.015-0.016)
(0.016-0.018)
(0.017-0.019)
(0.018-0.020)
(0.020-0.022)
(0.021-0.024)
0.008
0.010
0.011
0.012
0.013
0.014
0.015
0.016
0.017
0.018
60-day
(0.008-0.009)
(0.009-0.010)
(0.011-0.012)
(0.012-0.013)
(0.013-0.014)
(0.014-0.015)
(0.014-0.016)
(0.015-0.017)
(0.016-0.018)
(0.017-0.019)
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 NOAA Atlas 14 document for more information.
Back to Top
https://hdsc.nws. noaa.gov/hdsc/pfds/pfds_printpage.html?lat=3 6.2473&lon=-79.327l &dat... 2/ 19/2020

0
Table 8.03b
Value of Runoff Coefficient
(C) for Rational Formula
Land Use
C
Land Use
C
Business:
Lawns:
Downtown areas
0.70-0.95
Sandy soil, flat, 2%
0.05-0.10
Neighborhood areas
0.50-0.70
Sandy soil, ave.,
0.10-0.15
2-7%
Residential:
Sandy soil, steep,
0.15-0.20
Single-family areas
0.30-0.50
7%
Multi units, detached
0.40-0.60
Heavy soil, flat, 2%
0.13-0.17
Multi units, Attached
0.60-0.75
Heavy soil, ave.,
0.18-0.22
Suburban
0.25-0.40
2-7%
Industrial:
Heavy soil, steep,
0.25-0.35
Light areas
0.50-0.80
7%
Heavy areas
0.60-0.90
Agricultural land:
Parks, cemeteries
0.10-0.25
Bare packed soil
Smooth
0.30-0.60
Playgrounds
0.20-0.35
Rough
0.20-0.50
Cultivated rows
Railroad yard areas
0.20-0.40
Heavy soil no crop
0.30-0.60
Heavy soil with
Unimproved areas
0.10-0.30
crop
0.20-0.50
Streets:
Sandy soil no crop
0.20-0.40
Asphalt
0.70-0.95
Sandy soil with
Concrete
0.80-0.95
crop
0.10-0.25
Brick
0.70-0.85
Pasture
Heavy soil
0.15-0.45
Drives and walks
0.75-0.85
Sandy soil
0.05-0.25
Woodlands
0.05-0.25
Roofs
0.75-0.85
NOTE: The designer
must use judgement to select the appropriate
C
value within the range
for the appropriate land use. Generally,
larger
areas with permeable
soils, flat slopes, and dense vegetation
should
have lowest C values.
Smaller areas with slowly permeable
soils, steep
slopes, and sparse vegetation should
be assigned highest C
values.
Source: American Society of Civil Engineers
8.03.6 Rev. 6/06

Maps

USDA United States
Department of
Agriculture
N RCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Custom Soil Resource
Report for
Caswell County,
North Carolina
December 6, 2019

Custom Soil Resource Report
Soil Map
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Map projection: Web Mercator Comer 000rdinates: WGS84 Edge tics: UTM Zone 17N WGS84
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Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol
Map Unit Name
Acres in AOI
Percent of AOI
ChA
Chewacla loam, 0 to 2 percent
slopes, frequently flooded
0.0
0.0%
HeB
Helena sandy loam, 2 to 6
percent slopes
18.4
22.0%
HeC
Helena sandy loam, 6 to 10
percent slopes
11.3
13.6%
HeD
Helena sandy loam, 10 to 15
percent slopes
33.7
40.3%
RxE
Rowan -Poindexter complex, 15
to 45 percent slopes
18.2
21.8%
W
Water
2.0
2.3%
Totals for Area of Interest
83.6
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
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

Custom Soil Resource Report
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.

Custom Soil Resource Report
Map —Hydrologic Soil Group
649900 650000 650100 650200 650300 650400 65D500 650600 650700
36° 1525" N I I - I I 36° 1525" N
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649900 650000 650100 650200 650300 650400 650500 650600 650700
Map Scale: 1:5,760 if printed on A portrait (8.5" x 11") sheet.
Meters
N 0 50 100 200 300
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Map projection: Web Mercator Comer000rdinates: WGS84 Edge tics: lffM Zone 17N WGS84
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Custom Soil Resource Report
Table —Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOI
ChA
Chewacla loam, 0 to 2
B/D
0.0
0.0%
percent slopes,
frequently flooded
HeB
Helena sandy loam, 2 to
D
18.4
22.0%
6 percent slopes
HeC
Helena sandy loam, 6 to
D
11.3
13.6%
10 percent slopes
HeD
Helena sandy loam, 10
D
33.7
40.3%
to 15 percent slopes
RxE
Rowan -Poindexter
B
18.2
21.8%
complex, 15 to 45
percent slopes
W
Water
2.0
2.3%
Totals for Area of Interest
83.6
100.0%
Rating Options —Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff.- None Specified
Tie -break Rule: Higher
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