SW3240204_Stormwater Narrative_20240305

Hazen and Sawyer
9101 Southern Pine H
Suite
azenCharlotte, C 8273B 704.357.3150 250
February 28, 2024
Jim Farkas
NC Department of Environmental Quality
Division of Energy,Mineral, and Land Resource
512 N. Salisbury Street, Office 640M
Raleigh,N.C. 27604
Re: Post-Construction Stormwater Plan Review
Union County Water
Grassy Branch WRF Expansion
Jim Farkas:
Please find enclosed one (1) copy of the post construction stormwater narrative,including calculations
and application forms, as well as the two (2) copies of drawing sets needed to complete this hard copy
package for Union County Water's project titled Grassy Branch WRF Expansion. Two (2)copies of all
requested notarized files are included in the narrative binder. Digital files will be shared in a separate
transmittal e-mail.
Please note that this project has received ARPA funding (SRP-W-ARP-0103). The ARPA Letter of Intent
to Fund(LOIF)for the project has been included for consideration.
We look forward to working with you and your staff on this important project for Union County Water
and their customers. Should you have any questions,please feel free to contact myself at(704) 649-7080
or mparker(a hazenandsawyer.com.
Regards,
4-OL4 -P PI-J--_1
Mike Parker, PE
hazenandsawyer.com

0 V*s7nrt
ROY COOPER
Co vern or F
ELIZABETH S.BISER ` xr�.
5ecretary
SHAQI ESICAF NORTH CARCLINA
Director Environmental Quality
September 7,2023
Mr.Brian Matthews,Interim Manager
Union County
500 North Main Street/Suite 900
Monroe,North Carolina 28112
Subject: Letter of Intent to Fund—AMENDED
American Rescue Plan Act—Earmark
Lower Crooked Creek Wastewater
Reclamation Facility—Site B and
Grassy Branch Water Reclamation
Facility Expansion
DWI Project No.: SRP-W-ARP-0103
Dear Mr.Matthews:
The Division of Water Infrastructure (Division)has reviewed your amended Request for Funding and
determined your project is eligible to receive American Rescue Plan Act(ARPA)funding from the State Fiscal
Recovery Fund(SFRF),established in Session Law(S.L.)2021-180. Projects funded from the SFRF must meet
applicable federal law and guidance for the ARPA funds. The ARPA project grant will be one-hundred percent
(100%)of eligible project costs,up to a maximum of$8,000,000.
The first milestone is the submittal of abid-and-desiL_package y 01-February-2024. Please note that
this intent to fund is contingent on meeting all the following amended milestones:
Milestone Date(Original) Date (Amended)—
Apply for all Necessary Permits* ASAP ASAP
Bid-and-Design Package Submittal(obtain allpermits) 01-Feb-2023 01-Feb-2024
Bid-and-Design Package Approval 01-Jun-2023 01-A r-2024
Advertise Project,Receive Bids, Submit Bid Information,and 02-Oct-2023 03-Jun-2024
Receive Authority to Award
Execute Construction Contract(s) 01-Nov-2023 01-Au -2024
Receive Last Reimbursement-Statutory 31-Dec-2026 31-Dec-2026
An engineering alternatives analysis(EAA)may be required on certain projects.
See:https:lldeg.nc.Qovlabout/divisionsAvater-resourcesAvater-quality-pennittinZlnpdes-wastewater/permitting-process
Failure to meet any milestone may result in the forfeiture of funding for the proposed project.
All costs incurred prior to March 3,2021,are not eligible for ARPA funds, and all ARPA funds must be
expended prior to December 31,2026: The Division will make no reimbursement of ARPA funds after
December 31,2026.Please also note that upon a detailed review of the project during the funding process,
it may be determined that portions of your project are not eligible for funding.
Upon detailed review of the project during the funding process,it may be determined that portions of your
project are not eligible for funding and the total funding amount may be reduced Additionally, changes in the
North Carolina Department of Environmental Quality I Division of Water Infrastructure
<�*AEQ W A)
512 N.Salisbury Street 1 1633 Mail Service Center I Raleigh,North Carolina 27699-1633
depenmeM a Enmrenmenw viwiy 9191OT9160

Mr.Matthews
Union County
07-Sep-23
Page 2 of 2
scope or priority points awarded—based on additional information that becomes apparent during project
review—may also result in changes to the total funding amount and loan terms.
Environmental Review Requirements
The State Environmental Policy Act exempts projects funded by the State Reserve (such as this project)
from state-mandated environmental review.Federal requirements may still apply. [North Carolina General
Statute(N.C.G.S.) 113A-12(2)h.]
US Treasury Requirements
Projects with an expected total cost of ten million dollars($10,000,000)or more must meet US Treasury
requirements for prevailing-wage rates,project labor agreements,and related requirements. Recipients can either
certify meeting the requirements or provide plans and reports as the SLFRF Compliance and Reporting
Guidance (treasM.Rov) specifies.
Permitting Assistance
We are offering a free,permit-assistance service to address any questions you may have about potential
permitting requirements,pitfalls,fees, and timelines. If interested,please complete our online form at
hLtps:Hdeg.nc..gov/permits-rules/permit-assistance-and-guidance/permit-assistance-request-form and a regional
environmental coordinator will contact you.When applying for a permit,attach a copy of this letter to your
permit application. We find it is helpful to identify ARPA projects not only to get your permit to you faster but
also to assist with meeting the federal expenditure deadline of December 31,2026.
If you have any questions concerning this matter,or require general assistance regarding your project's
Division-awarded funding,please contact your project's assigned project manager,Logan Kluttz,P.E.,either by
telephone at 919.618.6064 or by e-mail at [e-mail].
Sincerely,
Shadi Eskaf, Director
Division of Water Infrastructure
cc: James N. Struve,P.E.,Hazen and Sawyer,Charlotte NC(jstruvc&hazenandsawyer.com)
Michelle Lancaster,Union County,Monroe NC(e-mail:michelle.lancasterkunioncoun, nc.gov)
Trupti Desai P.E.(DWI,via e-mail)
Antonio V. Evans,P.E. (DWI,via e-mail)
Logan Kluttz,P.E. (DWI,via e-mail)
Mark Hubbard,P.E.(DWI,via e-mail)
ARPA Project File(COM—LOIF)
DWI Agreement ID 2000059416

r-UNIONCOUNTY
t -
WATER
Grassy Branch WRF Expansion
Post - Construction stormwater
Prepared by:
�H GAR Hazen
Q
2'' .
Hazen and Sawyer
�NcM- 9101 Southern Pine Boulevard, Suite 250
�eC D PA Charlotte, North Carolina 28273
February 2024

Post - Construction Stormwater
Grassy Branch WRF Expansion
Fairview, North Carolina
Prepared by:
Hazen
Hazen and Sawyer
9101 Southern Pine Boulevard, Suite 250
Charlotte, North Carolina 28273
February 2024
H&S Project No.30831-070 Grassy Branch WRF
I Post Construction Stormwater Plan

TABLE OF CONTENTS
ProjectDescription.......................................................................................................................I
SiteDescription ...........................................................................................................................I
WaterResources..........................................................................................................................I
Post-Construction Stormwater......................................................................................................2
Future Construction Sequence......................................................................................................3
OtherPermitting..........................................................................................................................3
References ...................................................................................................................................4
LIST OF FIGURES
Figure 1 General Vicinity Map
Figure 2 Soil Distribution
Figure 3 USGS 1:24,000 Topographic Map - Stanfield Quadrangle
LIST OF APPENDICES
Appendix A Contract Drawings
Appendix B FEMA Flood Insurance Rate Maps (FIRMS)
Appendix C Supporting Calculations
Appendix D USGS StreamStats Delineation
Appendix E Supplement Forms
Appendix F Environmental Permitting Assessment
Appendix G Current Property Deed
Appendix H Permit Approval Forms
H&S Project No.30831-070 Grassy Branch WRF
II Post Construction Stormwater Plan

Project Description
This Post-Construction Stormwater narrative has been prepared for the proposed construction of
the 120,000 gallons per day (GPD) expansion of the Grassy Branch Water Reclamation Facility
(WRF). Proposed improvements include installing new influent pump station, new influent
screening facility, conversion of existing package treatment plant into equalization basins, new
package treatment plant, new aeration blowers, new disk filter system, new ultraviolet (UV)
disinfection system, new chemical facility, new flow equalization drain vault, modifications to
effluent measurement structure,new electrical building and generator,and miscellaneous site work
and demolition.
The total property area is 1.88 acres. Total land disturbance for the project is approximately 1.83
acres, which includes 0.47 acres outside of the property that will be acquired as temporary
construction easement(in progress).
Prior to the implementation of stormwater rules on July 1, 2007,there was a total of 0.30 acres BUA
on this site.This permit application is seeking coverage for an increase to 0.48 acres BUA.
Site Description
The Grassy Branch WRF is a 50,000 GPD wastewater treatment facility located in Fairview, North
Carolina owned and operated by Union County, North Carolina. A general vicinity map of the WRF
property is shown in Figure 1. Current conditions at the site include approximately 0.30 acres of
impervious surface, 0.03 acres of non-impervious structures (package treatment plant and
secondary clarifiers) and 0.40 acres of open water surface from Crooked Creek and Grassy Branch.
This property was originally deeded to Union County on April 11, 1997. This is the most current
property deed and is shown in Appendix G.
Soil types found at the WRF were identified based on information obtained from the United States
Department of Agriculture (USDA), Natural Resources Conservation Service (MRCS). The USDA Soil
Distribution Map of the property is shown in Figure 2.Topography of the Grassy Branch WRF consists
of Badin channery silty loam soils with mostly 8 to 15 percent slopes. The southwestern portion of
the property has Badin channery silty clay loam soils with 2 to 8 percent slopes.There is no evidence
of significant erosion under existing site conditions.
There is no existing engineered stormwater drainage on site.All drainage is conveyed via sheet flow
to either Crooked Creek or Grassy Branch. There are culverts present underneath the WRF access
road to convey stormwater from the adjacent farmland towards Grassy Branch. Existing storm
drainage is illustrated on sheet C5 of the Contract Drawings (Appendix A).
Water Resources
The Grassy Branch WRF is part of the Crooked Creek watershed within the Yadkin-Pee Dee River
Basin. See Figure 3 for the USGS topographic map of the surrounding project area. The northern
boundary drains directly to Crooked Creek,while the other sides drain to Grassy Branch, a tributary
of Crooked Creek. This tributary converges with Crooked Creek at the northeast corner of the
property. USGS's StreamStats was used to delineate the drainage area at this conversion, and it was
determined to be 44.2 square miles (Appendix D).The Grassy Branch WRF property boundary is less
H&S Project No.30831-070 Grassy Branch WRF
Post Construction Stormwater Plan

than 0.01%of the total contributing drainage area.Due to the significant difference between the total
project area (1.41 acres) and the contributing drainage area, offsite drainage was not considered in
the BUA table (Drawing C6). BUA percentages were determined by using the property line as the
drainage area boundary(Drawing C5).This allows for the accurate comparison between pre and post
construction BUA.
A wetland investigation was performed at the site which found that no portion of the project's limits
of disturbance resides in wetlands. See Note 1 on sheet C4 of the Contract Drawings (Appendix A)
and the Environmental Permitting Assessment(Appendix F).
An isolated stream with defined bed and bank and an apparent connection to groundwater was
present in the farm field adjacent to the WRF parcel. The defined bed and bank and groundwater
connection ended near the property line of the Grassy Branch WRF parcel,and the stream appeared
to flow subsurface to Grassy Branch from that point.There was no surface water connection between
the terminus of the defined bed and bank and Grassy Branch; therefore, available maps incorrectly
showed a surface water connection between the unnamed tributary and Grassy Branch.
Information provided by the Federal Emergency Management Agency (FEMA) was examined to
determine if designated floodplains are present at the Grassy Branch WRF. Portions of the work at
the southern edge of the project area extend into the Grassy Branch 100-year floodplain. The work
involves bringing the proposed WRF facilities up to the existing site grade, which is above the 100-
year floodplain elevation. Please refer to FEMA Flood Insurance Rate Map Panel 5550J,Map Number
3710555000J(October 16,2008)included in Appendix B of this submittal.A floodplain development
permit was issued by the Town of Fairview for this project(Appendix H).
Post-Construction Stormwater
Post-Construction Stormwater permitting at the site address is managed by the North Carolina
Department of Environmental and Natural Resources Division of Energy, Mineral and Land
Resources,under Rule 15A NCAC 2H.103(2).
According to Rule 15A NCAC 02H.1017 (4)of the North Carolina Administrative Code,a project shall
be considered a low-density project if it meets the low-density criteria set forth in Rule.1003(2) and
contains no more than 24 percent built-upon area (BUA). Based upon the built-upon area tabulation
in the application form,the project site meets this threshold with a total BUA of 18.4-percent.
It was noted in the Site Description section that stormwater sheet flows to either Crooked Creek or
Grassy Branch. In general, the project drainage patterns have been designed to mimic the existing
drainage patterns by using natural conveyances in lieu of storm drainage curb and gutter. The
northernmost existing stormwater culvert that conveys stormwater from the WRF property and
adjacent farm field will be replaced with a new stormwater culvert due to the proposed construction
and grading.
The proposed stormwater culvert underneath the WRF access road that conveys sheet flow from the
neighboring farm field towards Grassy Branch was sized to provide sufficient capacity. USGS's
StreamStats tool was used to delineate the drainage area to this culvert and the peak flow, which
were determined to be 18.7 acres and 27.0 cubic feet per second (cfs). See the culvert sizing
H&S Project No.30831-070 Grassy Branch WRF
2 Post Construction Stormwater Plan

calculation in Appendix C.
The aforementioned values from USGS StreamStats were also used to calculate the required
permanent conveyance swale lining leading up to the stormwater culvert, riprap sizing, and riprap
apron configuration.The riprap apron was sized using NC DEQ's design spreadsheet"Riprap Outlet
Protection" (Appendix C).
Future Construction Sequence
No future expansion of wastewater treatment facilities is planned for Grassy Branch WRF.Any future
expansion will be dictated by population growth and demand within the collection system.
Other Permitting
In addition to the NC DEQ Post-Construction Stormwater permit,the following other permits will be
obtained:
• Town of Fairview Floodplain Development and Non-Residential Zoning Permit
(submitted January 30, 2024)
o Town of Fairview Permit(NR 24012) received February 1, 2024
• Union County Commercial Site Plan Permit
o Submitted concurrently with Post-Construction Stormwater
• Duke Energy Plan Review
o Submitted concurrently with Post-Construction Stormwater
• NC DEQ Erosion and Sediment Control Permit
o To be submitted upon acquisition of temporary construction easement
• Union County Building Permit
o To be submitted upon Union County Commercial Site Plan approval
H&S Project No.30831-070 Grassy Branch WRF
3 Post Construction Stormwater Plan

References
Federal Emergency Management Agency(FEMA). (www.fema.gov/nfip)
Natural Resources Conservation Service.United States Department of Agriculture(MRCS USDA).Web
Soil Survey. (http://websoilsurvey.nres.usda.gov/)
North Carolina Department of Environment and Natural Resources.Division of Land Resources.Land
Quality Section (NCDENR). Erosion and Sedimentation Control Planning and Design Manual. May
2013,revision.
North Carolina Floodplain Mapping Information System (NCFMIS).
(http://www.ncfloodmal2s.com/firm indexes/) (Accessed December 2022).
H&S Project No.30831-070 Grassy Branch WRF
4 Post Construction Stormwater Plan

Figures
Figure 1 - General Vicinity Map
Figure 2-Soils Distribution
Figure 3- USGS 1:24,000 Topographic Map -Stanfield Quadrangle

Figure 1 - General Vicinity Map

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Figure 1 - General Vicinity Map
Grassy Branch Water Reclamation Facility
Union County Water a - en

Figure 2-Soils Distribution

Soil Map—Union County, North Carolina
(Grassy Branch WRF)
545870 545930 545990 546D50 546110 546170 546230
35o 7 56"N 35o 7 56"N
-------------------------
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Soil Map may not he valiel at this scale.
350 7 40"N I 350 7 40"N
545930 545990 546C150 546110 546170 546230
Map Scale:1:2,340 if printed on A portrait(8.5'x 11")sheet.
Meters
$ N 0 30 60 120 180 $
Feet
0 100 200 400 E00
Map projection:Web Mercator Conermordinates:WGS84 Edge tics:lfrM Zone 17N WGS84
usoA Natural Resources Web Soil Survey 8/7/2023
Conservation Service National Cooperative Soil Survey Page 1 of 3

Soil Map—Union County, North Carolina
(Grassy Branch WRF)
MAP LEGEND MAP INFORMATION
Area of Interest(A01) Spoil Area The soil surveys that comprise your AOI were mapped at
0 Area of Interest(AOI) Y Spot 1:24,000.
Soils Very Stony Spot Warning:Soil Map may not be valid at this scale.
Soil Map Unit Polygons
Wet spot Enlargement of maps beyond the scale of mapping can cause
,P Soil Map Unit Lines misunderstanding of the detail of mapping and accuracy of soil
Other line placement.The maps do not show the small areas of
Soil Map Unit Points Special Line Features contrasting soils that could have been shown at a more detailed
r�
Special Point Features scale.
Blowout Water Features
Streams and Canals Please rely on the bar scale on each map sheet for map
Borrow Pit measurements.
Transportation
Clay Spot _ Rails Source of Map: Natural Resources Conservation Service
Closed Depression Web Soil Survey URL:
.,o Interstate Highways Coordinate System: Web Mercator(EPSG:3857)
Gravel Pit US Routes
Maps from the Web Soil Survey are based on the Web Mercator
Gravelly Spot Major Roads projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
0 Landfill Local Roads Albers equal-area conic projection,should be used if more
A. Lava Flow Background accurate calculations of distance or area are required.
Marsh or swamp Aerial Photography This product is generated from the USDA-NRCS certified data as
of the version date(s)listed below.
Mine or Quarry
Soil Survey Area: Union County, North Carolina
Miscellaneous water Survey Area Data: Version 23, Sep 12,2022
Perennial Water Soil map units are labeled(as space allows)for map scales
Rock Outcrop 1:50,000 or larger.
Saline Spot Date(s)aerial images were photographed: Mar 13,2022—May
9,2022
Sandy Spot
• The orthophoto or other base map on which the soil lines were
Severely Eroded Spot compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
Sinkhole shifting of map unit boundaries may be evident.
Slide or Slip
Sodic Spot
usoA Natural Resources Web Soil Survey 8/7/2023
Conservation Service National Cooperative Soil Survey Page 2 of 3

Soil Map—Union County, North Carolina Grassy Branch WRF
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
BaB Badin channery silt loam,2 to 1.3 4.5%
8 percent slopes
BaC Badin channery silt loam,8 to 1.6 5.7%
15 percent slopes
BdB2 Badin channery silty clay loam, 7.0 24.3%
2 to 8 percent slopes,
moderately eroded
ChA Chewacla silt loam,0 to 2 13.2 46.3%
percent slopes,frequently
flooded
CmB Cid channery silt loam, 1 to 5 2.4 8.4%
percent slopes
GoC Goldston very channery silt 2.2 7.5%
loam,4 to 15 percent slopes
GoE Goldston very channery silt 0.9 3.2%
loam, 15 to 45 percent
slopes
Totals for Area of Interest 28.6 100.0%
USDA Natural Resources Web Soil Survey 8/7/2023
Conservation Service National Cooperative Soil Survey Page 3 of 3

Figure 3- USGS 1:24,000 Topographic Map -Stanfield Quadrangle

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Appendices
Appendix -Contract Drawings
Appendix B-FEMA Flood Insurance Rate Maps(FIRMS)
Appendix C-Supporting Calculations
Appendix D- USGS StreamStats Delineation
Appendix E-Supplement Forms
Appendix F-Environmental Permitting Assessment
Appendix G-Current Property Deed
Appendix H-Permit Approval Forms

Appendix A
Contract Drawings
(Full size drawings have been attached under a separate cover)

Appendix B
FEMA Flood Insurance Rate Maps (FIRMS)
Panel 5550-Map No.3710555000J(1 sheet)

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the MSC F1RMette Web idol-This map does rwr reflen changes or amendments which may here
been made wbsequent to the doer an She titla block,For additional information about how to
make sure the map is current,please see She Food Flax rd Mapping Updates Overview Fact Sheet
available on the FEMA Flood Map service Center home page at https:llmsc.Rma,goo.

Appendix C
Supporting Calculations
NOAA Atlas 14 Precipitation Data
Diversion Swale for Post Construction
USGS StreamStats Peak Flow
Culvert Calculations
Riprap Outlet Protection Calculations

NOAA Atlas 14 Precipitation Data

NOAA Atlas 14,Volume 2,Version 3
Location name: Fairview,North Carolina,USA*
Latitude:35.13050,Longitude:-80.49450
Elevation:514 ft**
'source:ESRI Mapvo
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)1
Average recurrence interval(years)
Duration��� 10 25 50 100 200 500 1000
5-min 4.98 5.88 6.84 7.52 8.30 8.84 9.32 9.76 10.2 10.6
(4.58-5.42) 11 (5.41-6.41) 1 (6.26-7.44) 11 (6.89-8.17) 1 (7.57-9.00) 11 (8.02-9.58) 11 (8.42-10.1) 1 (8.77-10.6) 11 (9.12-11.1) 1 (9.35-11.5)
10-min 3.98 4.70 5.47 6.02 6.61 7.04 7.41 7.73 8.09 8.32
(3.67-4.33) (4.33-5.13) (5.02-5.96) (5.51-6.53) (6.04-7.17) (6.39-7.63) (6.70-8.03) (6.95-8.39) (7.21-8.80) (7.36-9.06)
15-min 3.32 3.94 4.62 5.07 5.59 5.94 6.24 6.50 6.79 6.96(3.05-3.60) (3.62-4.30) (4.23-5.03) (4.64-5.51) (5.10-6.06) (5.39-6.44) (5.64-6.76) (5.84-7.05) (6.05-7.38) (6.16-7.58)
30-min 2.27 2.72 3.28 3.68 4.14 4.47 4.78 5.06 5.40 5.64
(2.09-2.47) (2.50-2.97) (3.01-3.57) (3.37-3.99) (3.78-4.49) (4.06-4.85) (4.32-5.18) (4.55-5.49) (4.81-5.87) (4.99-6.14)
60-min 1.42 1.71 2.10 2.39 2.76 3.03 3.29 3.55 3.88 4.12
(1.30-1.54) (1.57-1.86) (1.93-2.29) (2.19-2.60) (2.51-2.99) (2.75-3.29) (2.98-3.57) (3.19-3.85) (3.45-4.21) (3.64-4.48)
2-hr 0.820 0.992 1.23 1.41 1.64 1.82 1.99 2.17 2.39 2.56
(0.752-0.897) (0.908-1.09) 1 (1.12-1.35) 11 (1.29-1.54) 1 (1.49-1.79) 11 (1.64-1.98) 11 (1.79-2.17) 1 (1.93-2.36) (2.11-2.61) (2.24-2.80)
3-hr 0.581 0.701 0.876 1.01 1.19 1.33 1.48 1.62 1.82 1.98
(0.531-0.639) (0.642-0.771) (0.800-0.962) (0.920-1.11) 1 (1.08-1.30) 11 (1.20-1.45) 11 (1.32-1.61) 1 (1.44-1.77) 11 (1.59-1.98) 1 (1.71-2.16)
6-hr 0.351 0.423 0.528 0.611 0.722 0.811 0.902 0.995 1.12 1.22
(0.321-0.385) (0.387-0.464) (0.483-0.579) (0.557-0.668) (0.654-0.788) (0.730-0.883) (0.806-0.981) (0.881-1.08) (0.981-1.22) (1.06-1.33)
12-hr 0.206 0.249 0.313 0.364 0.434 0.490 0.548 0.610 0.695 0.764
(0.189-0.226) (0.229-0.274) (0.287-0.343) (0.332-0.399) (0.393-0.474) (0.440-0.534) (0.488-0.597) (0.537-0.663) (0.602-0.755) (0.652-0.830)
24-hr 0.123 0.148 0.186 0.216 0.258 0.292 0.326 0.363 0.413 0.453
(0.113-0.133) (0.137-0.161) (0.172-0.202) (0.199-0.235) (0.236-0.280) (0.266-0.317) (0.297-0.354) (0.329-0.394) (0.372-0.449) (0.406-0.494)
2ilay 0.66-0 078 0.80-0 094 0.100-08117 0.1015 0..1136 0.137-0..1161 0.154-0..1182 0.1071-0 203 0.189-0 226 0.2113-0 257 0.232-0 282
3iiay 0.051 0.061 0.076 0.088 0.104 0.117 0.130 0.144 0.164 0.179
(0.047-0.055) (0.056-0.066) (0.070-0.082) (0.081-0.095) (0.095-0.112) (0.107-0.126) (0.119-0.141) (0.131-0.156) (0.148-0.178) (0.162-0.195)
aiiay 0.37--0 043 0.045-0 052 0.055-0 064 0.63-0 074 0.075-0.088 0.84-0.099 0.93 0.110 0.103-0.122 0.1016-0..1138 0.126 0..1152
7iiay 0.026 0.031 0.038 0.044 0.052 0.058 0.064 0.071 0.080 0.087
(0.024-0.028) (0.029-0.034) (0.036-0.041) (0.041-0.047) (0.048-0.055) (0.053-0.062) (0.059-0.069) (0.065-0.076) (0.073-0.086) (0.080-0.094)
10-day 0.021 0.025 0.030 0.034 0.040 0.044 0.049 0.053 0.059 0.065
(0.020-0.022) (0.023-0.027) (0.028-0.032) (0.032-0.037) (0.037-0.043) (0.041-0.047) (0.045-0.052) (0.049-0.057) (0.055-0.064) (0.059-0.069)
20-day 0.014 0.017 0.020 0.022 0.025 0.028 0.031 0.033 0.037 0.040
(0.013-0.015) (0.016-0.018) (0.018-0.021) (0.021-0.023) (0.024-0.027) (0.026-0.030) (0.029-0.033) (0.031-0.035) (0.034-0.039) (0.037-0.042)
30-day 0.011 0.013 0.016 0.017 0.020 0.022 0.023 0.025 0.027 0.029
(0.011-0.012) (0.013-0.014) (0.015-0.017) (0.016-0.018) (0.019-0.021) (0.020-0.023) (0.022-0.025) (0.023-0.027) (0.026-0.029) (0.027-0.031)
45-day 0.009 0.011 0.013 0.014 0.016 0.017 0.018 0.019 0.021 0.022
(0.009-0.010) (0.011-0.012) (0.012-0.013) (0.013-0.015) (0.015-0.017) (0.016-0.018) (0.017-0.019) (0.018-0.021) (0.020-0.022) (0.021-0.024)
60-day 0.008 0.010 0.011 0.012 0.014 0.015 0.016 0.017 0.018 0.019
(0.008-0.009) (0.009-0.010) (0.011-0.012) (0.012-0.013) (0.013-0.014) (0.014-0.015) (0.015-0.016) (0.016-0.017) (0.017-0.019) (0.018-0.020)
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

NOAA Atlas 14,Volume 2,Version 3
Location name: Monroe, North Carolina, USA* � '
Latitude:35.1289*, Longitude: -80.4961°
Elevation: 536 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)1
Average recurrence interval (years)
1 2 5 10 25 50 100 200 500F 1000
5-min 0.415 0.490 0.570 0.627 0.692 0.737 0.777 0.813 0.853 0.881
(0.382-0.452) (0.451-0.534) (0.522-0.620) (0.574-0.681) (0.631-0.750) (0.668-0.798) (0.702-0.842) (0.731-0.882) (0.760-0.927) (0.779-0.959)
10-min 0.663 0.784 0.912 1.00 1.10 1.17 1.24 1.29 1.35 1.39
(0.611-0.721) (0.721-0.855) (0.837-0.993) (0.918-1.09) 1 (1.01-1.20) 11 (1.06-1.27) 11 (1.12-1.34) 1 (1.16-1.40) 11 (1.20-1.47) 1 (1.23-1.51)
15-min 0.829 0.986 1.15 1.27 1.40 1.48 1.56 1.63 1.70 1.74
(0.763-0.901) (0.906-1.07) 1 (1.06-1.26) 11 (1.16-1.38) 1 (1.28-1.52) 11 (1.35-1.61) 11 (1.41-1.69) 1 (1.46-1.76) 11 (1.51-1.84) 1 (1.54-1.90)
30-min 1.14 1.36 1.64 1.84 2.07 2.24 2.39 2.53 2.70 2.82
(1.05-1.24) 11 (1.25-1.48) 1 (1.50-1.78) 11 (1.68-2.00) 1 (1.89-2.24) 11 (2.03-2.42) 11 (2.16-2.59) 1 (2.28-2.74) 11 (2.41-2.94) 1 (2.50-3.07)
60-min 1.42 1.71 2.10 2.39 2.76 3.03 3.29 3.55 3.88 4.12
(1.30-1.54) 11 (1.57-1.86) 1 (1.93-2.29) 11 (2.19-2.60) 1 (2.51-2.99) 11 (2.75-3.29) 11 (2.98-3.57) 1 (3.19-3.85) 11 (3.45-4.21) 1 (3.64-4.48)
2-hr 1.64 1.98 2.46 2.82 3.29 3.64 3.99 4.33 4.78 5.12
(1.50-1.80) (1.82-2.1 7) (2.25-2.69) (2.57-3.08) (2.98-3.58) (3.29-3.96) (3.59-4.35) (3.87-4.72) (4.23-5.22) (4.49-5.60)
3-hr 1.75 2.11 2.63 3.04 3.58 4.00 4.43 4.87 5.46 5.93
(1.60-1.92) (1.93-2.32) (2.40-2.89) (2.76-3.32) (3.24-3.91) (3.60-4.37) (3.96-4.83) (4.32-5.31) (4.79-5.96) (5.14-6.48)
6-hr 2.10 2.53 3.17 3.66 4.33 4.86 5.40 5.96 6.73 7.33
(1.92-2.31) (2.32-2.78) (2.90-3.47) (3.34-4.00) (3.92-4.72) (4.38-5.29) (4.83-5.88) (5.28-6.48) (5.88-7.30) (6.33-7.97)
12-hr 2.49 3.01 3.78 4.39 5.23 5.91 6.61 7.35 8.38 9.21
(2.29-2.73) (2.76-3.31) (3.46-4.14) (4.00-4.81) (4.74-5.71) (5.31-6.44) (5.89-7.19) (6.47-7.99) (7.26-9.10) (7.87-10.0)
24-hr 2.96 3.56 4.48 5.21 6.21 7.01 7.84 8.71 9.92 10.9
(2.73-3.21) (3.30-3.87) (4.13-4.87) (4.79-5.65) (5.69-6.74) (6.40-7.61) (7.14-8.52) (7.90-9.47) 11 (8.94-10.8) 1 (9.77-11.9)
3.47 4.18 5.22 6.04 7.17 8.08 9.02 10.0 11.4 12.4
2tlay (3.21-3.76) (3.87-4.54) (4.82-5.66) (5.57-6.54) (6.59-7.77) (7.40-8.75) (8.23-9.78) (9.08-10.9) 11 (10.3-12.4) 1 (11.2-13.6)
3.68 4.42 5.49 6.34 7.51 8.44 9.41 10.4 11.8 13.0
3tlay (3.41-3.98) 11 (4.10-4.78) 1 (5.08-5.94) 11 (5.85-6.85) 1 (6.90-8.11) 11 (7.74-9.13) 11 (8.60-10.2) 1 (9.49-11.3) 11 (10.7-12.8) 1 (11.7-14.1)
3.89 4.67 5.76 6.63 7.84 8.80 9.80 10.8 12.3 13.5
4tlay (3.61-4.19) 11 (4.33-5.03) 1 (5.34-6.22) 11 (6.13-7.15) 1 (7.22-8.46) 11 (8.09-9.51) 11 (8.98-10.6) 1 (9.89-11.7) (11.2-13.3) (12.2-14.6)
4.48 5.35 6.52 7.46 8.75 9.78 10.8 11.9 13.5 14.8
7tlay (4.19-4.81) (5.01-5.74) (6.10-6.99) (6.96-8.00) (8.13-9.38) (9.07-10.5) (10.0-11.6) 1 (11.0-12.8) (12.4-14.6) (13.5-15.9)
10tlay 5.16 6.14 7.39 8.38 9.71 10.8 11.8 12.9 14.4 15.6
(4.84-5.51) (5.75-6.55) (6.92-7.88) (7.83-8.93) (9.05-10.3) (10.0-11.5) (11.0-12.6) 1 (11.9-13.8) 11 (13.3-15.4) 1 (14.3-16.7)
20tlay 6.93 8.18 9.66 10.8 12.4 13.7 14.9 16.2 17.9 19.3
(6.54-7.35) (7.71-8.67) (9.10-10.2) (10.2-11.5) (11.7-13.2) (12.8-14.5) (13.9-15.9) 1 (15.1-17.2) 11 (16.7-19.1) 1 (17.9-20.6)
30tlay 8.50 9.99 11.6 12.9 14.6 15.9 17.1 18.4 20.1 21.4
(8.03-8.99) (9.46-10.6) (11.0-12.3) (12.2-13.6) (13.7-15.4) (14.9-16.8) (16.1-18.2) (17.2-19.5) (18.8-21.4) (19.9-22.8)
45tlay 10.7 12.6 14.4 15.8 17.6 18.9 20.3 21.6 23.3 24.6
(10.2-11.3) (11.9-13.2) (13.6-15.1) (14.9-16.5) (16.6-18.4) (17.9-19.9) (19.1-21.3) (20.3-22.7) (21.9-24.6) (23.0-26.0)
60tlay 12.8 14.9 16.9 18.4 20.3 21.8 23.2 24.6 26.4 27.7
(12.2-13.4) (14.2-15.6) (16.1-17.6) (17.5-19.2) (19.4-21.3) (20.7-22.8) (22.0-24.4) (23.3-25.8) (24.9-27.8) (26.2-29.2)
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
PF graphical

PD5-based depth-duration-frequency (DDF) curves
Latitude: 35-12991, Longitude- -86-4961"
Average recurrence
interval
25 tyears)
c — t
Z- 20 2
a — 5
a
-0 15 — 10
a — 25
— 200
a
5 _ — 500
1000
1= E E E 1= fV rt5 4b -Y -0-0 -0 -0 -Q -Q -0-0
i e op 'n N N p 6 6LA 6r•I ,1 rn LO ❑tJfB#IOR .i N rn v to
25
C
r
20 Duration
C — 5-min — 2-day
15 — 10-min — 3-day
a
4.1
15 min — diary
49 — 3d-min — 7-day
EL ILO
Mmin — 10-day
— 24hf — 20 day
5 - — 3-1mr — 30--day
64hu — 45-4ay
I2-ftr — 64--day
24-rir
1 2 5 10 25 50 100 2D0 500 3000
Average recurrence interval (yearn)
1+44AA Atlas 14,Volume 2,Version 3 Created(GIYT):Fri Dec 22 15:04:33 2023
Back to Top
Maps & aerials
Small scale terrain

Diversion Swale for Post Construction

Channel Calculations-Diversion Swale
Project: Grassy Branch WRF Expansion
Client: Union County
Location: Union County,NC
Objective: Design channel to convey flow in a non erosive manner
References: (1) North Carolina Erosion and Sediment Control Planning and Design Manual
(2) Elements of Urban Stormwater Design,H.R.Malcom.
Procedure: Use procedures outlined in the above reference. Rational Method will be used to calculate
flows. Normal depth will be calculated using Mannings Equation and water velocity will be
calculated using the principle of continuity(Q=VA)
Channels will be designed to carry flow generated by the 10-Year storm event using
maximum slope.
Calculations: Post-D�eioped
Rational Method: Q=C'I'A
Where
Q=Flow(cfs)
C=Runoff Coefficient
I=Rainfall Intensity(in/hr)
A=Drainage Area(ac)
Find C value in Reference 2
Find Intensity for 10-year event in Reference 2
C=
1=
Drainage area(A)(ac)_
Q(cfs)= 27.0 10-year design storm(source:StreamStats)
Check channel for adequate depth and for need for armoring
Assume 2.5 ft/s as maximum allowable velocity for bare earth and 4.5 ft/s
as maximum allowable velocity for grass lined
Design channel lining using tractive force procedure
Calculations will be done using Manning's Equation to find normal depth
and Continuity(Q=V'A)to find velocity.
Q(cfs)= 2 7.0
S_(ft/ft)= 0.017
B(ft)= 0
M(ft)= 3
Channel cross section
Calculate normal depth and velocity with bare earth as lining
From Ref.2, n= 0.02
Flow(cfs)= 27.0
normal depth(ft)= 1.2
velocity(ft/s)= 6.56
Since velocity is greater than the 2.5 ft/s limit for bare earth,
M M
TEMPORARY OR PERMANENT LINING WILL BE REQUIRED
Calculate normal depth and velocity with grass as lining
From Ref.2, n= 0.03
Flow(cfs)= 27.0
normal depth(ft)= 1.4
velocity(ft/s)= 4.84
Since velocity is greater than the 4.5 ft/s limit for grass lined,
PERMANENT LINING WILL BE REQUIRED
Perm-Temp Channel-Grassy Branch

Calculate normal depth and velocity for PERMANENT LINING
From product manual,n= 0.031
Flow(cfs)= 27.0
normal depth(ft)= 1.4
velocity(ft/s)= 4.72
Calculate shear stress
Shear stress(lb/ft2)=(62.4 Ib/ft)'(normal depth)'(slope)
shear stress(Ib/ft2 )= 1.46
Use permanent lining with a minimum shear stress
shear stress(/b/ft2)= 2.00
Max Permissible Shear Max Velocity
Unvegetated Vegetated Unvegetated Vegetated
Lining Type Manufaturer and Model n'' Ibs/ft2 Ibs/ft2 ft/s ft/s
Straw w/Net-RECM North American Green-S150 0.044 1.75 N/A 6.00 N/A
Coconut Fiber-RECM North American Green-C125 0.019 2.25 N/A 10.00 N/A
Polypropylene Mat-TRM North American Green-P300 0.029 3.00 8.00 9.00 16.00
Polypropylene Mat-TRM North American Green-P550 0.031 4.00 14.00 12.50 25.00
n value interpolated for normal depth of 1.0 ft
Temporary shear stress:1.75-2 Ibs/sf
Permanent shear stress:2 Ibs/sf
Perm-Temp Channel-Grassy Branch

USGS StreamStats Peak Flow

Grassy Branch WRF-StrearnStats Report
Region ID: NC
Workspace ID: NC2O24O1O4175934687OOO
Clicked Point(Latitude, Longitude): 35.13067,-80.49433
Time: 2024-01-04 13:00:03-0500
Grassy Branch WRF 1629 Old Fish Rd,Monroe,NC Peak Now
O Collapse All
Basin Characteristics
Parameter Code Parameter Description Value Unit
DRNAREA Area that drains to a point on a stream 0.0292 square miles
LCO6IMP Percentage of impervious area determined from NLCD 2006 impervious dataset 0.81 percent
PCTREG1 Percentage of drainage area located in Region 1 -Piedmont/ Ridge and Valley 100 percent
PCTREG2 Percentage of drainage area located in Region 2-Blue Ridge 0 percent
PCTREG3 Percentage of drainage area located in Region 3-Sandhills 0 percent
PCTREG4 Percentage of drainage area located in Region 4-Coastal Plains 0 percent
PCTREG5 Percentage of drainage area located in Region 5-Lower Tifton Uplands 0 percent
Peak-Flow Statistics
Peak-Flow Statistics Parameters [Region 1 Piedmont rural under 1 sgmi 2014 5030]
Parameter Code Parameter Name Value Units Min Limit Max Limit
DRNAREA Drainage Area 0.0292 square miles 0.1 1
LCO6IMP Percent Impervious NLCD2OO6 0.81 percent 0 47.9

Peak-Flow Statistics Parameters [Peak Southeast US NC 2023 50061
Parameter Code Parameter Name Value Units Min Limit Max Limit
PCTREG1 Percent Area in Region 1 100 percent 0 100
PCTREG2 Percent Area in Region 2 0 percent 0 100
PCTREG3 Percent Area in Region 3 0 percent 0 100
PCTREG5 Percent Area in Region 5 0 percent 0 100
DRNAREA Drainage Area 0.0292 square miles 0.08 8902
PCTREG4 Percent Area in Region 4 0 percent 0 100
Peak-Flow Statistics Disclaimers [Region 1 Piedmont rural under 1 sgmi 2014 50301
One or more of the parameters is outside the suggested range.Estimates were extrapolated with unknown errors.
Peak-Flow Statistics Flow Report [Region 1 Piedmont rural under 1 sgmi 2014 5030]
Statistic Value Unit
50-percent AEP flood 13.6 ft^3/s
20-percent AEP flood 21.5 ft^3/s
10-percent AEP flood 27 ft^3/s
4-percent AEP flood 33.8 ft^3/s
2-percent AEP flood 39 ft^3/s
1-percent AEP flood 44.2 ft^3/s
0.5-percent AEP flood 49.2 ft^3/s
0.2-percent AEP flood 58.5 ft^3/s
Peak-Flow Statistics Disclaimers [Peak Southeast US NC 2023 5006]
One or more of the parameters is outside the suggested range.Estimates were extrapolated with unknown errors.
Peak-Flow Statistics Flow Report [Peak Southeast US NC 2023 5006]
Statistic Value Unit
50-percent AEP flood 15.2 ft^3/s
20-percent AEP flood 28.7 ft^3/s
10-percent AEP flood 40 ft^3/s
4-percent AEP flood 55.9 ft^3/s
2-percent AEP flood 70.3 ft^3/s
1-percent AEP flood 85 ft^3/s
0.5-percent AEP flood 100 ft^3/s
0.2-percent AEP flood 121 ft^3/s
Peak-Row Statistics Citations
Feaster,T.D.,Gotvald,A.J., and Weaver,J.C.,2014,Methods for estimating the magnitude and frequency of floods for urban and
small, rural streams in Georgia, South Carolina, and North Carolina,2011 (ver. 1.1, March 2014): U.S. Geological Survey Scientific
Investigations Report 2014-5030, 104 p. (http://pubs.usgs.gov/sir/2014/5030/)
Feaster,T.D.,Gotvald,A.J., Musser,J.W.,Weaver,J.C. Kolb, K.R.,Veilleux,A.G., and Wagner, D.M.2023, Magnitude and frequency
of floods for rural streams in Georgia, South Carolina,and North Carolina, 2017—Results: U.S. Geological Survey Scientific
Investigations Report 2023-5006,75 p. (https://pubs.er.usgs.gov/publication/sir20235006)

USGS Data Disclaimer:Unless otherwise stated,all data,metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data
were collected.Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S.Geological Survey(USGS),no
warranty expressed or implied is made regarding the display or utility of the data for other purposes,nor on all computer systems,nor shall the act of distribution constitute any
such warranty.
USGS Software Disclaimer:This software has been approved for release bythe U.S.Geological Survey(USGS).Although the software has been subjected to rigorous review,the
USGS reserves the right to update the software as needed pursuant to further analysis and review.No warranty,expressed or implied,is made bythe USGS or the U.S.Government
as to the functionality ofthe software and related material nor shall the fact of release constitute anysuch warranty.Furthermore,the software is released on condition that neither
the USGS northe U.S.Government shall be held liable for any damages resulting from its authorized or unauthorized use.
USGS Product Names Disclaimer:Any use oftrade,firm,or product names is for descriptive purposes only and does not imply endorsement by the U.S.Government.
Application Version:4.19.2
StrearnStats Services Version:1.2.22
NSS Services Version:2.3.2

Culvert Calculations

Culvert Report
Hydraflow Express Extension for Autodesk®Civil 3D®by Autodesk, Inc. Wednesday,Jan 31 2024
Circular Culvert
Invert Elev Dn (ft) = 513.02 Calculations
Pipe Length (ft) = 22.00 Qmin (cfs) = 27.00
Slope (%) = -0.50 Qmax (cfs) = 34.00
Invert Elev Up (ft) = 512.91 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 30.0
Shape = Circular Highlighted
Span (in) = 30.0 Qtotal (cfs) = 27.00
No. Barrels = 1 Qpipe (cfs) = 27.00
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 6.05
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 7.27
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 515.16
HGL Up (ft) = 514.68
Embankment Hw Elev (ft) = 515.80
Top Elevation (ft) = 518.70 Hw/D (ft) = 1.16
Top Width (ft) = 11.00 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elev(ft) CAga Hw Depth(ft)
519.00 6.09
518.00 5.09
517.00 4.09
516.00 3.09
515.00 2.09
514.00 1.09
513.00 0.09
512.00 -0.91
511.00 -1.91
0 5 10 15 20 25 30 35 40 45
GircularGulvert HGL Embank
Reach(ft)

Riprap Outlet Protection Calculations

DESIGN OF RIPRAP OUTLET PROTECTION
User Input Data
Calculated Value
Reference Data
Designed By: CAB Date: 1/24/24
Checked By: CJM Date: 1/24/24
Company: Hazen and Sawyer, P.C.
Project Name: Grassy Branch WRF
Project No.: 30831-070
Site Location (City/Town) Union, NC
Temporary and
Culvert Id. Permanent Diversion
Swales
Total Drainage Area (acres) 18.688
Step L Determine the tail-t titer depth from channel clutracteristics below the
pipe outlet for the design capacity of the pipe_ If the tailwater depth is less
than half the outlet pipe diameter. it is classified nu ti-mum tailwater condition.
If it is greater than half the pipe diameter. it is classified maximum condition.
Pipes that outlet onto wide flat areas with no defined chatuiel are assumed
to have a mm' nium tailwater condition unless reliable flood stage elevations
show othemise_
Outlet pipe diameter, Do (in.) 30
Tailwater depth (in.) 25.62
Minimum/Maximum tailwater? Max TW (Fig. 8.06b)
Discharge (cfs) 27.0
Velocity (ft./s) 6.05
Step 2. Based on the tailwater conditions determuied in step 1_ enter Figure
8.06a or Figure 8.06b.and determine dsariprap size and ntinimtm apron length
(L.). The dr, size is the median stone size in a well-graded riprap apron_
Step ;. Determine apron width at the pipe outlet_ the apron shape. and the
apron width at the outlet end from the same figure used in Step ?.

Minimum TW Maximum TW
Figure 8.06a Figure 8.06b
Riprap d50, (ft.) 0.5 0.1
Minimum apron length, La (ft.) 16 12
Apron width at pipe outlet (ft.) 7.5 7.5
Apron shape wedge wedge
Apron width at outlet end (ft.) 18.5 7.3
Stela 4. D]-t niiune the maxiniiun stone diaxuetei
dt", - 1 .5 x dso
Minimum TW Maximum TW
Max Stone Diameter, dmax (ft.) 0.75 0.15
Step 5. Deternnine the apron thiclaiess:
Apron thickness = 1.5 x dam,
Minimum TW Maximum TW
Apron Thickness(ft.) 1.125 0.225
Step 6. Fit the nprap apron: to the site by making it le%-el for the nuniminn
length. La- from Figure 8.06a or Figure 8.06b. Extend the apron farther
don;-ustream and along channel banks until stability is assured_ Keep the
apron as straight as possible and align it ssrith the flow of the receiving stream.
eke any necessary-abgnxnent bends near the pipe outlet so that the entrance
unto the receiving streani is straight.
Soule locations mad-regiure luting of the entire channel cross Section to assure
stabilirv.
It may be necessary to increase the size of riprap where protection of the
channel side slopes is necessary (Appendix 5.05)_ NX-lere overfalls exist at
pipe outlets or flows are excessive. a plunge pool should be considered. see
page 8.06.8_
Recommended Riprap Apron Size
Apron Length (ft.) 12
Apron Width (ft.) 8
Thickness of Stone (ft.) 1.1
NCDOT Stone Class Class 1

Figure 8.06a: Design of outlet protection from a round pipe flowing full,
minimum tailwater condition (Tw<0.5 diameter)
3 0
Outlet W 0o d 90
pipe
diameter (Da)
La - _ ...h
i water - 0.5Qo
La,`�til 70
a60
l
�u 50 .... ....1................ K
I
t0% { ..:
4 ...".
-'t 4
30 �. { •{ {...: A A ..
2LOL
N
77
v
v _ 50 4
0
3 5 10 20 51 100 200 500 1000
Discharge 013lsec)
Curves may not be extrapolated.
Figure 8-06a Design of Outlet protecwn protection from a round pipe flawing full,minimum tailwater condition(7w c 0-5 diamelery
Rev.1e*03 8.063

Figure 8.06b: Design of outlet protection from a round pipe flowing full, maximum
tailwater condition (Tw>=0.5 diameter)
300
Outlet W = Do + O.4La 120 ----r r
pipe j Jr
diameter(00)L t.a � 110 11
i
_ .500
I00 �y
90 i.-
I
i "
a
QQ 70 F- ...
� a
• 3
30
20
V N
�0,• 1� G7
25
0 . - �. ab a 1 ¢
a
v- to c '
1
3 5 10 20 50 100 200 Soo 1000
❑ischarge(Olsec)
Curves may not be extrapolated.
Figure S.06b design of outlet pro teclion tram a round pipo flowing full,maximum Iailwater condition(T.?0 5 dame ter)
8.06.4 RPN-.11'93

Appendix D
USGS StreamStats Delineation

Crooked Creek/Grassy Branch StreamStats Report
Region ID: NC
Workspace ID: NC20240209184920504000
Clicked Point(Latitude,Longitude): 35.13126,-80.49389
Time: 2024-02-09 13:50:00-0500
521
Iva i[�t H i l l
4F5•
Matthews
c
Pine�ilfe A�
Indian-i arl�
Jyx
Fort Mil! sh1°nlrca'�
9 L
Lock Hill York Co — - Airport
B ryyarl{Airpo rt �rx�`.; i Ylix;r�rr n Mat sh'diIle,
T ,Mariroe :'Jirlgate
StreamStats report generated for the point where Grassy Branch comes together with Crooked Creek(adjacent to Grassy
Branch WRF).
O Collapse All
Basin Characteristics
Parameter Code Parameter Description Value Unit
DRNAREA Area that drains to a point on a stream 44.2 square miles
LC06IMP Percentage of impervious area determined from NLCD 2006 impervious dataset 8.91 percent
PCTREGI Percentage of drainage area located in Region 1 -Piedmont/Ridge and Valley 100 percent
PCTREG2 Percentage of drainage area located in Region 2-Blue Ridge 0 percent
PCTREG3 Percentage of drainage area located in Region 3-Sandhills 0 percent
PCTREG4 Percentage of drainage area located in Region 4-Coastal Plains 0 percent
PCTREG5 Percentage of drainage area located in Region 5-Lower Tifton Uplands 0 percent
Peak-Flow Statistics
Peak-Flow Statistics Parameters [Peak Southeast US NC 2023 5006]
Parameter Code Parameter Name Value Units Min Limit Max Limit
PCTREGI Percent Area in Region 1 100 percent 0 100
PCTREG2 Percent Area in Region 2 0 percent 0 100
PCTREG3 Percent Area in Region 3 0 percent 0 100
PCTREG5 Percent Area in Region 5 0 percent 0 100
DRNAREA Drainage Area 44.2 square miles 0.08 8902
PCTREG4 Percent Area in Region 4 0 percent 0 100

Peak-Flow Statistics Flow Report [Peak Southeast US NC 2023 5006]
PIL:Lower 90%Prediction Interval,PIU:Upper 90%Prediction Interval,ASEp:Average Standard Error of Prediction,SE:Standard Error
(other--see report)
Statistic Value Unit PIL PIU ASEp
50-percent AEP flood 1730 ft"3/s 953 3140 36.8
20-percent AEP flood 2910 ft"3/s 1650 5150 35.8
10-percent AEP flood 3830 ft"3/s 2150 6820 36.3
4-percent AEP flood 5050 ft"3/s 2720 9380 38.4
2-percent AEP flood 6120 ft"3/s 3270 11500 39.8
1-percent AEP flood 7140 ft"3/s 3730 13700 41.3
0.5-percent AEP flood 8180 ft"3/s 4180 16000 42.8
0.2-percent AEP flood 9560 ft"3/s 4780 19100 44.4
Peak-Flow Statistics Citations
Feaster,T.D.,Gotvald,A.J.,Musser,J.W.,Weaver,J.C,Kolb,K.R.,Veilleux,A.G.,and Wagner,D.M.2023,Magnitude and frequency of
floods for rural streams in Georgia,South Carolina,and North Carolina,2017—Results:U.S.Geological Survey Scientific Investigations
Report 2023-5006,75 p.(https://pubs.er.usgs.gov/publication/sir20235006)
USGS Data Disclaimer:Unless otherwise stated,all data,metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were
collected.Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S.Geological Survey(USGS),no warranty
expressed or implied is made regarding the display or utility of the data for other purposes,nor on all computer systems,nor shall the act of distribution constitute any such warranty.
USGS Software Disclaimer:This software has been approved for release by the U.S.Geological Survey(USGS).Although the software has been subjected to rigorous review,the USGS reserves
the right to update the software as needed pursuant to further analysis and review.No warranty,expressed or implied,is made bythe USGS orthe U.S.Government as to the functionality of
the software and related material nor shall the fact of release constitute any such warranty.Furthermore,the software is released on condition that neither the USGS nor the U.S.Government
shall beheld liable for any damages resulting from its authorized or u nauthorized use.
USGS Product Names Disclaimer:Any use of trade,firm,or product names is for descriptive purposes only and does not imply endorsement by the U.S.Government.
Application Version:4.19.4
StreamStats Services Version:1.2.22
NSS Services Version:2.2.1

Appendix E
Supplement Forms
Permit Application Form
Supplement-EZ Forms
Operations&Maintenance Agreement
Operation&Maintenance Manual

Permit Application Form

Supplement-EZ Forms

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION_
1 Project Name Grasey Branch WRF Expanelon_
2 Project Area ac 1.41
3 Coastal Wetland Area ac _ 0
4 Surface Water Area ac 0.47
5 Is this project High or Low Density? _ _ Low
6 Does this project use an off-site SCM? No
WMPLLANCE VATH 02H.1003(4)
7 Width of ve etated setbacks provided(feet) _ 30
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? No
NUMBER AND TYPE OF SCMe:
11 'Infiltration System 0
12 jBioretention Cell 0
13 Wet Pond 0
14 Stormwater Welland 0
15 Permeable Pavement 0 _
16 Sand Filter 0 _
17 Rainwater Harvesting(RWH) 0
18 Green Roof 0
19 Level Spreader-Filter Strip(LS-FS) 0
20 Disconnected Impervious Surface(DIS) 0
21 T SR19ntSwale 0
22 Dry Pond 0
23 StormFilter 0
24 Silva Cell 0
25 Ba alter 0 _
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Michael Parker,P.E.
28 Organization:_ Hazen and Sawyer
29 Street address: 9101 Southern Pine Boulevard,-Suits 250
30 !City.State,Zip: Charlotte,NC 28273
31 !Phone numberls): 17W4 940-8910
32 lEmail: [e-mail]
"fire on S [ an
I certify,under penalty of law that this Supplement-EZ forrn and all supporting Infom nation were prepared under my direction or supervislorr,that the
Infornaflon provided In the loran t%to the best of my knowledge and befiet,true,accurate,and complete;and that the engines rig pier*,
specifications.operation and maintmence agreements and other supporting Wornudlon we consistent WM the Information provided here.
r)cs"ikr�er
CA
Ar- t
- 0,
SEAL r Signature of Designer -K 1,
26432
D.
seal Date

DRAINAGE AREAS
1 Is this a high density project? No
2 If so,number of drainage areas/SCMs 0
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LID 1
4 Type of SCM Dispersed flow Dispersed flow
5 Total drainage area(sq ft) 61420 61420
6 Onsite drainage area(sq ft) 61420 61420
7 Offsite drainage area(sq ft) n/a n/a
8 Total BUA in project(sq ft) 20910 sf 20910 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) n/a n/a
New BUA not on subdivided lots(subject to
10 permitting)(so 9320 sf 9320 sf
11 Offsite BUA(sq ft) n/a n/a
12 Breakdown of new BUA not on subdivided lots:
Parking(sq ft) sf sf
Sidewalk(sq ft) sf sf
Roof(sq ft) 2560 sf 2560 sf
Roadway(sq ft) 6760 sf 6760 sf
Future(sq ft) sf sf
Other,please specify in the comment box
below(sq ft) sf sf
New infiltrating permeable pavement on
13 Isubdivided lots(sq ft) sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 11590 sf 11590 sf
16 Existing BUA that is already permitted(sq ft) sf sf
17 Existing BUA that will be removed(sq ft) sf sf
18 Percent BUA 18% 18%
19 Design storm(inches) 7.5 in 7.5 in
20 Design volume of SCM(cu ft) n/a n/a
21 Calculation method for design volume n/a n/a
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
The Grassy Branch WRF property boundary is less than 0.001%of the total
contributing drainage area according to StreamStats(Appendix D). Due to
the significant difference,offsite drainage was not considered in the BUA
table(Drawing C6). Percent BUA includes all BUA that will be on site after

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) 3:1
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 4.7
6 Are curb outlet swales proposed? No
7 Maximum longitudinal slope of curb outlet swale(s)(%) n/a
8 Bottom width of curb outlet swale(s)(feet) n/a
9 Maximum side slope of curb outlet swale(s)(H:V) n/a
10 Minimum length of curb outlet swale(s)(feet) n/a
11 Are treatment swales used instead of curb outlet swales? No
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
A permanent conveyance swale has been designed to convey on-site and off-site runoff to the receiving stream.In general,the
project drainage patterns have been designed to mimic the existing drainage patterns.The site has been designed to use natural
conveyances in lieu of storm drainage curb and gutter.Please refer to Appendix C for supporting calculations for the permanent
conveyance swale.The drainage area size and peak flow were developed using USGS StreamStats,and backchecked using
available topographic and aerial imagery.
Swale Drainage BUA Pervious Q Slope Vanow V.—I Flow depth
# Area (ac) area C (cfs) (%) (fps) (fps) (ft)
1 18.70 n/a n/a n/a 27.00 1.70 16.00 4.70 1.40
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
2

Operations&Maintenance Agreement

Operation & MaIntenance Agreement
Project Name: Grassy Branch WRF Expansion
Project Location: 1629 Old Fish Road, Monroe, NC 28110
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: 0 Location(s):
Infiltration Trench Quantity: 0 Location(s):
Bioretention Cell Quantity: 0 Location(s):
Wet Pond Quantity: 0 Location(s):
Stormwater Wetland Quantity: 0 Location(s):
Permeable Pavement Quantity: 0 Location(s):
Sand Filter Quantity: 0 Location(s):
Rainwater Harvesting Quantity: 0 Location(s):
Green Roof Quantity: 0 Location(s):
Level Spreader-Filter Strip Quantity: 0- Location(s):
Proprietary System Quantity: 0 Location(s):
Treatment Swale Quantity: 0 Location(s):
Dry Pond Quantity:ffNo
Location(s):
Disconnected Impervious Surface Present: Location(s):
User Defined SCM Present: Location(s):
Low Density Present: Type: Dispersed flow only
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: Union County Water
Title&Organization: Thomas Mann
Street address: 500 N Main Street,Suite 600
City,state,zip:Monroe,NC 28112
Phone number(s): [phone]
Email: [e-mail]
Signature: Date:
I � � -�.��,�� a Notary Public for the State of p a-2�',
County of do hereby certify that
personally appeared before me this rL day of - f,y, � and
acknowledge the due execution of the Operat' s ce Agreement.
Witness my hand and official seal,
�tinnn�
a a
txOTA Y •ff
a
• R
•
5 ••••• • My commission expires My m° ^Ezpires 10l7I2025
y�4rr NlNaS4���
STORM-EZ 2/23/2024
Version 1.5 O&M Agreement Page 1 of 1

Operation&Maintenance Manual

Low Density Maintenance Requirements
Important maintenance procedures:
The drainage area to the vegetated conveyance or vegetated receiving area will be carefully
managed to reduce the sediment load to the vegetated conveyance or vegetated receiving area.
After the initial fertilization to establish the grass in the vegetated conveyance or the vegetated
receiving area, fertilizer will not be applied to the vegetated receiving areas.
The vegetated conveyance or vegetated receiving area will be inspected quarterly. Records of operation and
maintenance will be kept in a known set location and will 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 to remediate the problem:
Vegetation is too short or Maintain grassed vegetation such that the swale or vegetated
Vegetation too long. area does not erode during the peak flow from the 10-year
storm
Trash/debris is present. Remove the trash/debris.
Vegetated receiving Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-
areas erosive gullies have sod (or plant with other appropriate species) and water until
formed. established. Provide lime and a one-time fertilizer application.
Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site.
The outlet device(if
applicable)
The outlet device is Repair or replace the outlet device.
damaged
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 site
are causing erosion or Contact the local NCDEQ Regional Office.
sedimentation in the
receiving water.
1

Appendix F
Environmental Permitting Assessment

Hazen and Sawyer
9101
lvd.,Suite 250
azenCharlottSe,Houthern
C 8273 B704.57.3150
Grassy Branch Water Recovery Facility Expansion
Environmental Permitting Assessment
January 22, 2024
Hazen reviewed publicly available maps and geographic information systems (GIS) data and visited the
site on September 15, 2023 to determine the extents of potential jurisdictional waters,protected species,
and historical resources that could be affected by the Grassy Branch Water Recovery Facility (WRF)
Expansion project.
Desktop Assessment
Methods
Hazen staff(Jarrod Karl and Emily Rittberger)performed a preliminary desktop assessment to collect
background information related to wetlands,waters and protected species prior to conducting the on-site
field investigation. To determine the potential presence of streams,wetlands and open waters in the
proposed project area,Hazen consulted the United States Geological Survey National Map (TNM)',the
United States Fish and Wildlife Service National Wetlands Inventory (NWI)Wetlands Mapper2 and
United States Department of Agriculture -Natural Resources Conservation Service Web Soil Survey
(WSS)3 maps pertaining to the proposed project area. To determine the potential presence of protected
species or critical habitat in the proposed project area,Hazen consulted the United States Fish and
Wildlife Service (USFWS) Information for Planning and Consultation(IPaC) online database'for Union
County and Natural Heritage Element Occurrence (NHEO) Geographic Information System (GIS)
shapefiless. To determine the presence of historic or cultural resources,Hazen consulted the North
Carolina State Historic Preservation Office's HPOWEB 2.0 web application6.
Results
Maps reviewed for the presence of potential wetlands and waters indicated the presence of three streams,
Crooked Creek, Grassy Branch and an unnamed tributary to Grassy Branch,that border the proposed
project area to the north, east, and south respectively. All three streams appeared to be outside the
proposed limits of disturbance.No hydric soils or wetlands were indicated.
' United States Geological Survey, The National Map.https://viewer.nationalmap.gov/basic/.
2 United States Fish and Wildlife Service,Wetlands Mapper.https://www.fws.gov/wetlands/Data/Mapper.html.
o s United States Department of Agriculture,Natural Resources Conservation Service,Web Soil Survey.
https://websoilsurvey.nres.usda.gov/.
'United States Fish and Wildlife Service,Information for Planning and Consultation..
https://ipae.ecosphere.fws.gov/.
s North Carolina Natural Heritage Program,Natural Heritage Element Occurrence Shapefiles.
'North Carolina Historic Preservation Office,HPOWEB 2.0.
https://ne.map s.aregis.com/home/item.html?id=d2dO4d8d7eO3403f889419526e682529.
hazenandsawyer.com

Hazen
The list of protected species for Union County indicated one federally endangered mussel species
(Carolina heelsplitter(Lasmigona decorata)) and two endangered plant species (Michaux's sumac (Rhus
michauxii) and Schweinitz's sunflower(Hehanthus schweinitzii)). Based on a review of the NHEO GIS
shapefiles,there were no records of federally protected species onsite or within two miles of the site. One
state-listed endangered mussel(Carolina creekshell (Villosa vaughaniana))may be present in Crooked
Creek and Grassy Branch.No historical resources were identified.
Field Assessment
Streams and Wetlands
An isolated stream with defined bed and bank and an apparent connection to groundwater was present in
the farm field adjacent to the WRF parcel. The defined bed and bank and groundwater connection ended
near the property line of the Union County Water Recovery Facility(WRF)parcel,and the stream
appeared to flow subsurface to Grassy Branch from that point. There was no surface water connection
between the terminus of the defined bed and bank and Grassy Branch;therefore, available maps
incorrectly showed a surface water connection between the unnamed tributary and Grassy Branch.
The area between the end of the stream and the culvert under the WRF driveway was planted in soybeans
and appeared to function as an alluvial fan where sediment from the isolated stream gets deposited during
storm events. Ephemeral stormwater flows exit the isolated stream, sheet flow across the fan, and exit the
site through a culvert under the WRF driveway.
Soils within portions of the alluvial fan did not meet the criteria for hydric soils. Hydrology indicators
were not observed with the exception of the area closest to the terminus of the isolated stream channel.
Hydrophytes were not observed in the fan area or in the mowed area between the fan and the culvert.
Based on the field evidence,no wetlands were present within the proposed limits of disturbance.
Protected Species
There was no suitable habitat present onsite for federally threatened or endangered species. Crooked
Creek and Grassy Branch were outside the limits of disturbance.
Results and Conclusions
No impacts to the isolated stream are proposed, and no disturbance is proposed east of the WRF
driveway. Therefore,no impacts to jurisdictional streams or wetlands are anticipated.
There are no records of federally protected species onsite or within 2 miles of the site; and there is no
suitable habitat onsite. Therefore,no impacts to federally protected species are anticipated. There is one
record of a state-protected species in Crooked Creek and Grassy Branch;however,the creeks are outside
the proposed limits of disturbance. Therefore,no impacts to state protected species are anticipated.
There are no historical resources present onsite. Therefore,no impacts to historical resources are
anticipated.
Page 2 of 2
hazenandsawyer.com

Appendix G
Current Property Deed

BK959PG874
NP
:.�,Y OR mfTR IC �1��
��• `� y1t1.00
R.n n Fled for rmd
0$1Lj Real Estate t)ate y M
-fl-
luNA J Exckse Tex lima
so G'Clock�
�Y G�.�PTU, R4W d
`^^a"r, t�IOffOC,�I Ca�llrle
Aeeurdlre T Ifa,lode in]►p
I Fx4te T.f 40.pp
Tax Lot No. Parcel Identifier No. Portion of o8-o9o_oo7
Verified by Ctuarty an the _ day of , 19_;by
i 1
Hail after recording to P.O. Sox 21B, "Ionroe, N. C. 28111-0218
This instrurent was prepared by Donald C. pexry 11
Brief Description for the index 1.88 acres, Goose Creek TWP. i
I
I NORTH CAROLINA GENERAL WARRANTY DEED
THIS uEED made this April Q 11,997, byand between
i GRAMM GRAWEE
1
BMUN Cla= (widower) LVION O NiY, a political subdivisim of
the State of North Caroline
i •', 00 P. 0. eccx 218
umroe; N. C. 28111-0M
l�r i Iii Lice bL- k 1•i a'H ­r ..lu r;i� u1, I[ qt nl.,,•,•'h ..� d if*
The designation Cantor and Grantee as used herein shall include said parties, their heirs,
successors, and assigns, and shall include singular, plural, masculine, feminine or neuter
as required by context.
' WT1ni [, that the G=Lor, for a valuable consideration paid by the Grantee, the receipt
of which is hereby acknowledged, has and by these presents does grant, bargain, sell and
caivey unto the Grmtee in fee single, all that certain lot or parvel of land situated in the
City of n/a , Doom Croak Tomiship, Union County, North Carolina and nm-e particularly
described as follows;
r
BEGINNING at a new iron pin located wdin a puke Power rranvTr ssion line right d way,wtkh
{ begmrtg part is tied to a NCGS►rlxuT*rd"Uniormlle,"said be9hnin9 part toeing boated S.3rr
23.39 W.19046.20 gra-M feet(19043.85 grid)from said momment,and riming tt>e xe from the
begirnng point,whin the Duke Pw4er right of way,N.700044 E.277.77 feet to a new iron On;
t rnce N. 19404-25 W. 129.32 fcct to an exisling iron pin;ttaice N.00-38-23 W.165.00 fed to a
new iron pin,tl") e S-67-55-51 W.334.77 few a new im On;thence S.1959,%E.272-88 feed
{ to the point of BEGINNING and containing 1.88 any+1 (81,852 square feet).
>1
N.C. Bar Assoc. Form No. 7 43 1977
Printed by Agreamvnt-it', eho H.C. Hat Aa . 0003

I
BK959PG875
The Party herei above described was acquired by Grantor by instrument recorded in Book
Page .
A map shuwing the above described property is recorded in Plat , page
TO HAVE AND TO HMD the aforesaid lot or parcel of land and all privileges and appurtenances
thereto belonging to the Grantee in fee single.
And the Grantor covenants with the Grantee, that Grantor is seized of the pranises in fee
single, has the right to cammy the same in fee sirrple, that title is narketable and free and
clear of all encumbrances, and that Grantor will warrant and defend the title against the
lawful claims of all persons whomsoever except for the exceptions 11eroeirkifter stated.
Title to the property hereinabove described is subject to the following exceptions:
&bject to any eaemienta and righta of war far roads and utilities tdairh may)bonder or croon
&aid property.
IN WITNESS *EREdF, the Grantor has hereunto set his Viand and seal, or if corporate, has
caused this instrtsrent to be signed in its corporate name by its drily authorized officers
and its seal to be hereunto affixed by authority of its Board of Directors, the day and
year first above written.
(SEAL)
(tbrporate Name) 9=1=C20*2. Vidwer
By.
(SEAT..)
President
ATT�I':
{SEAL)
Secretary (Nrporate Seal) (SEAL)
�Tq►L- '• NORI}t CAROLM, Union CDUnLy.
I, a Notary Public of the 0tunty and State aforesaid, certify that Buren
widOmer
onpersonallypersonallyply appeared before r� this day and acknowledg d
the ere ution of the foregoing jest PATent. Witness
stamp or seal, this day of
my hand and official
MY cYx iEssion expires; ► %LA 2�1999
LJ L�. C} - 7' _.-. to C 72\1 — Notary Publ is
M"-9M Ito NOM CARDLINA, tbtulty.
I, a Notary Public of the Cbunty and State aforesaid, certify that
this day and acklowl PersaUlly came before ne
ed3ed that he/she is Secretary of , a North
Carolina nor-profit corporation, and that by authority dully given and as the
act of the corporation, the foregoing instrlMML was signed in its naafi by
it President, sealed with its Corporate seal and attested by
h'Rlher as its Secretary. Witness my hared and official stamp or
da
seal, this y 19
3NY carnnission expires:
Notary Public
The foregoing Ckextificat") of tAD41ua �W'fron �
isl t.ertified to be correct. This instriment and this certificate are duly registered at
the Yate and in the Boo}[and Page shown on the first page hereof. JSjy G_ MIM
Tt1;GISTRR OM FCIR Cr7LWN
sty/ sQk4 at-Register of Deeds.
l
H.C. Bat Aaaoc. Form Ho. 7 0 1977
C,Snt�zy Aar. ent with thn ti.C. Bar A--

Appendix H
Permit Approval Forms
Union County Floodplain Development Permit(NR 24012)

Union County Floodplain Development Permit(NR 24012)

Revisal 1 118119
Zoning
'own of Fairview Class ficat on*:
7516 Concord 1lighway Monroe INC 28110 0-"�
W Conditional Use,
Commerical Or attach recorded permit
QQI--MSIDENTlAL USE ZONING PERMIT
Permit Number: Date: Fee Paid: Check Number.
!union County 7041 292.2560 �[e-mail]
Applicant Name: Phone#: Email:
500 N Main Street, Suite 600_ Monroe 'N� 5112 730
Appiieant Mailing Address: City State Zip
Property Information
Street Address: 1629 Old Fish Road, Monroe, NC
Tax Parcel Number:1OS'�23��7B pry;�88 ac Street Frontage:NIA __
Gross Floor Area; 042 sf Principal Use: M u n icipa i
Sign Square Footage N/A -__ �_Parking Spaces Provided: N/A
Principal Structure Requirements:
Required- Pro used
Feet Front Setback 75
Feet Rear Yard Setback 80
Feet Left Side Yard 0
Feet Right Side Yard 100
Feet(Max) Bldg. Height 12.69
Feet(Max) Lot Width @ Front Setback 77
**See Section 184 Building Setback Requirements of the Land Use Ordinance
ATTACH THE FOLLOWING: Two copies of a scaled dimensional survey drawn by and certified as true and correct by a surveyor or
engineer registered with the state of North Carolina which shows the shape,dimensions and location of the lot to be built upon,uses and
existing structures on the lot. upon this survey shall be sketched the following: (a)the shape,dimensions,and area of proposed location
of proposed structure to be placed upon the lot;(b)ail setback lines on the lot once the proposed structure is completed,affirmatively
showing that the area of the proposed location will meet all setback requirements.and;(e)any other information that may be needed to
insure that the propwed structure is in corn liance with all a2plicabic provisions of the Town of Fairview Land Use Ordinance
l HEREBY CERTIFY that all of the information provided For this application and all attachments arc true and correct to the best of my
knowledge. 1 Further certify that l am familiar with ail requirements of the Town of Fairview Land Use Ordinance concerning this
proposed use. I acknowledge that any violation of this ordinance will be grounds for revoking this permit and any subsequent permit
issued by the Town of Fairview,
APPLICANT.SIGNATURE
Tma hos Mann, CIP Program Manager 1-30-24 _
THIS PERMIT IS: .APPROVED DISAPPROVED
LAND USE ADMINISTRATOR DATE
Co

Town of Fairview
FLOODPLAIN DEVELOPMENT PERMIT APPLICATION
Date: - 110t)mv� Permit Number: Alle- Aple,
Received by: _ 0;0� Property P.I.N.:
Location of Property: 1629 Old Fish Road Monroe NC
Type of Development;
Excavation: X Fill: X Grading: X Utility Construction: X
Road Construction: Residential Construction: Nonresidential Construction:
Addition: Renovation: Other(specify):
Size of Development:
FIRM Data: Map Panel No.: 5550 Suffix 7 Map Panel Date; 10/16/2008 Map Index Date:
Flood Zone; AE,X COBRA zone. NIA
Regulatory Floodway info: (Check correct option below)
Inside Regulatory Floodway Outside Regulatory Floodway X No Regulatory Floodway
Development Standards Data:
i. If Inside Regulatory Floodway is checked above,attach engineering certification and supporting data as required.
2. Base flood elevation(BFE)per FIRM at development site 518.30 (NGVD).
3. Regulatory flood elevation at development site(BFE+locally adopted freeboard): 520.30 (NGVD).
4. Elevation in relation to mean sea level(MSL)at or above which the lowest floor(including basement)must be constructed
520,50 (e@lz or above BFE+Freeboard)
5. Elevation in re anon to mean sea level (MSL) at or above which all attendant utilities to include, but not limited to, all heating, air
conditioning and electrical equipment must be installed 520.50 @ or above BFE+Freeboard_(NGVD).
6. Will garage(if applicable)be used for any purpose other than parking vehicles,building access,or storage? NIA
If yes,then the garage must be used in determining the lowest floor elevation.
7. Proposed method of elevating the structure: slab on grade
(a)if foundation wall is used-provide minimum of 2 openings
(b)Total area of openings required: NIA (I sq. inch per sq. foot of enclosed footprint area below BFE)
7. Will any watercourse be altered or relocated as a result of the proposed development? No
If yes,attach a description of the extent of the alteration or relocation.
8. Floodproofing information(if applicable):
Elevation in relation to mean sea level (MSL)to which structure shall be floodproofed NIA (NGVD).
Applicant ac know led anent: I the undersigned understand that the issuance of a floodplain development permit is contingent upon the above
information being correct and that the plans and supporting data have been or shall be provided as required. I also understand that prior to
occupancy of the structure being permitted,an elevation and/or floodproofing certificate signed by a professional engineer or registered land
surveyor must be on file with the Town of Fairview Planning Deparnnent indicating the"as built'elevations in relation to mean sea level(MSL).
Print or Type Name of Applicant Print or Type Name of Land Use Administrator(LUA)
Thomas Mann CIP Program Manage Ed Humphries
Sitmatute of Applicant& ate Si • f d e Admi 'slrator&Date
1-29-24
Address&Telephone Number Ad ss&Telephone Number
500 N Main Street,Suite 600 751 b Concord Hi hwa
Monroe,NC 28 1 1 2-4730 Monroe.NC 28110
[phone] 704 564-3412

Town of Fairview
FLOODPLAIN DEVELOPMENT PERMIT APPLICATION
l/Date: ,10,7 Permit Number: Aloe-
if 4
Received by: Property P,I.N.; X719/2-9 cep71-15,
Location of Property: 1629 Old Fish Road Monroe NC
Type of Development:
Excavation: X Fill: X Grading: X Utility Construction: X
Road Construction: Residential Construction: Nonresidential Construction;
Addition: Renovation: Other(specify):
Size of Development:
FIRM Data: Map Panel No.: 5550 Suffix I Map Panel Date: 10/16/2008 Map Index Date:
Flood Zone: AE,X COBRA zone: NIA
Regulatory Floodway Info: (Chock correct option below)
Inside Regulatory Floodway Outside Regulatory Floodway X No Regulatory Floodway
Development Standards Data:
1. If Inside Regulatory Floodway is checked above,attach engineering certification and supporting data as required.
2. Base flood elevation(BFE)per FIRM at development site 518.30 (NGVD).
3. Regulatory flood elevation at development site(BFE+locally adopted freeboard): 520.30 (NGVD).
4, Elevation in relation to mean sea level (MSL)at or above which the lowest floor(including basement)must be constructed
520.50 (@ or above BFE+Freeboard)
5. Elevation in re anon to mean sea level (MSL)at or above which all attendant utilities to include,but not limited to, all heating, air
conditioning and electrical equipment must be installed 520.50 @ or above BFE+Freeboard_(NGVD).
6, WiII garage(iC applicable)be used for any purpose other than parking;vehicles,building access,or storage? NIA
If yes,then the garage must be used in determining the lowest floor elevation.
7. Proposed method of elevating the structure: slab on grade
(a)If foundation wall is used-provide minimum of 2 openings
(b)Total area of openings required: NIA (I sq. inch per sq.foot of enclosed footprint area below BFE)
7. Will any watercourse be altered or relocated as a result of the proposed development? No
If yes,attach a description of the extent of the alteration or relocation.
8. Floodprovfing information(if applicabte):
Elevation in relation to mean sea level (MSL)to which structure shall be floodpronfed NIA (NGVD).
Aonlicant acknowledment: I the undersigned understand that the issuance of a floodplain development permit is contingent upon the above
information being correct and that the plans and supporting data have been or shall be provided as required. I also understand that prior to
occupancy of the structure being perrnittcd,an elevation and/or floodproofing certificate signcd by a professional cng inc 0r or Togistered land
surveyor must be on file with the Town of Fairview Planning Department indicating;the"as built"elevations in relation to mean sea level(MSL).
Print or Type Name of Applicant Print or Type Name of Land Use Administrator(LUA)
Thomas Mann,CIP Prowum Manager Ed Humphries
Siggnal=of Applicant&33ate Sign- a e Administrator&Date
1-29-24
Address&Telephone Number Addr s&Telephone Number
500 N Main Street Suite 600 7516 Concord Hi hwa
Monroe NC 281124730 Monroe,NC 28 1 10-
704 292-2560 704 564-3412

IV/� 241el l—
Hagen Hazen and Sawyer
9103 Southern Pine Boulevard,Suite 250
Charlotte,NC 28273-704.357.3150
January 30,2024
Mr. Ed Humphries
Fairview Town Hall
7516 Concord Highway
Monroe, NC,28110
Re: Union County Water
Grassy Branch WRF Expansion Project
Request for Floodplain Development Permit
Dear Mr. Humphries:
On behalf of Union County Water,Hazen and Sawyer submits this letter and attachments to request a
Floodplain Development Permit for the Grassy Branch Water Reclamation Facility(WRF)Expansion
project. The following attachments are included for review:Application,Environmental Permitting
Assessment, FEMA flood map,and supporting drawings/figures.
This project proposes to expand the Grassy Branch WRF from an initial capacity of 0.05 million gallons
per day(mgd)to 0.12 mgd.The facility,located in northern Union County,will treat Union County
customers in the surrounding area. Construction is scheduled to begin in late summer 2024.The scope of
construction work includes:
• New Influent Pump Station(IPS)to increase total influent pumping capacity and replace
existing IPS.
■ New Influent Screening Facility.
• Conversion of existing Package Treatment Plant into Equalization Basins.
• Demolition of existing Secondary Clarifiers,Filters,and Disinfection system.
+ New Package Treatment Plant to accommodate increased permitted flows(aeration tanks,
secondary clarifiers,and sludge holding tank).
• New aeration blowers to serve the new Package Treatment Plant.
• New disk filter system.
• New ultraviolet(UV)disinfection system.
• New Chemical Facility for alkalinity addition to replace existing facility.
• Modification to existing Effluent Measurement Structure.
■ New Electrical Building and Generator.
+ Miscellaneous site work(yard piping,valves,grading,etc.).
hazenandsawyer.eorn

AIR -OW
Hazen
Portions of the work at the southern edge of the project area extend into the Grassy Branch 100-year
floodplain. The work involves bringing the proposed WRF facilities up to the existing site grade,which is
above the 100-year floodplain elevation. Please refer to FEMA Flood Insurance Rate Map Panel 5550J,
Map Number 3710555000J(October 16,2008)and sheets C4 and C30 included in this submittal.
The effective HEC-RAS models for Crooked Creek and Grassy Branch were downloaded from North
Carolina's Flood Risk information System(NC FRIS)and examined to determine project impacts. Cross-
Section 222 (XS 222)of Grassy Branch intersects the project area were the proposed improvements are
located,see Figure 1, Grassy Branch XS 222 models ineffective flow starting at Station 4895.10 and
continuing west until outside of the floodplain. The eastern most edge of the proposed improvements start
approximately at Station 4981.10 and are therefore well contained within the ineffective flow area,see
Figure 2. Because the proposed improvements are located in an area of ineffective flow,any associated
fill does not impact the capacity of Grassy Branch's floodplain.
A wetland investigation was performed at the site which found that no portion of the project's limits of
disturbance resides in wetlands.Refer to Note 1 on drawing C4 and the Environmental Permitting
Assessment for documentation.
Thank you for your consideration of this application. If you have any questions or need any additional
information to complete your review, please do not hesitate to contact me at 704-649-7080 or via email at
[e-mail].
Very truly yours,
AA -4-P Q�
Michael Parker,PE
Senior Associate
Cc: Fred Braun (Union County Water)
f'al,!L?ol,2
hazenandsawyer.com