SW3240204_Stormwater Narrative_20240617

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UNIONCOUNTY
WAT E R
Grassy Branch WRF Expansion
Post - Construction Stormwater
Prepared by:
4o <oo_Ss,o4y 4-9Hazen
ea_
0 5 3 8 81 Hazen and Sawyer
eqc, FNG�N��� ,k 6/17 Ac)21 9101 Southern Pine Boulevard, Suite 250
ygRY E. � Charlotte, North Carolina 28273
June 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
June 2024
H&S Project No. 30831-070 Grassy Branch WRF
Post Construction Stormwater Plan

TABLE OF CONTENTS
Project Description 1
Site Description 1
Water Resources 1
Post-Construction Stormwater 2
Future Construction Sequence 3
Other Permitting 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 0.52 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 0.41 acres of open water surface from Crooked Creek, Grassy Branch, and
an intermittent stream.
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 (NRCS). 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
H&S Project No. 30831-070 Grassy Branch WRF
1 Post Construction Stormwater Plan

determined to be 44.2 square miles (Appendix D).The Grassy Branch WRF property boundary is less
than 0.01%of the total contributing drainage area.Due to the significant difference between the total
project area (1.40 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 intermittent 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. NC DEQ conducted a stream determination to corroborate Hazen's investigation on
March 11, 2024.The findings from this stream determination are included in Appendix F.
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 19.3-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
H&S Project No. 30831-070 Grassy Branch WRF
2 Post Construction Stormwater Plan

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,which was determined to be
18.7 acres. The Rational Method was used to estimate the peak flow to the culvert. See the culvert
sizing calculation in Appendix C.
The aforementioned values described in the previous paragraph 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(submitted March 5, 2024)
o Conditional Approval received March 14, 2024
• Duke Energy Plan Review
o Submitted March 5, 2024
• NC DEQ Erosion and Sediment Control Permit
o Submitted March 6, 2024
• 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(NRCS 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.ncfloodmaps.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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Grassy Branch Water Reclamation Facility Hazen
Union County Water

Figure 2-Soils Distribution

3 Soil Map—Union County,North Carolina
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USDA Natural Resources Web Soil Survey 8/7/2023
1011. 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(AOI) Spoil Area The soil surveys that comprise your AOI were mapped at
Area of Interest(AOI) 1:24,000.
Q Stony Spot
Soils 03 Very Stony Spot Warning:Soil Map may not be valid at this scale.
0 Soil Map Unit Polygons
Wet Spot Enlargement of maps beyond the scale of mapping can cause
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p Soil Map Unit Points contrasting soils that could have been shown at a more detailed
Special Line Features
Special Point Features scale.
(o, Blowout Water Features
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cs Borrow Pit measurements.
Transportation
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0 Closed Depression Web Soil Survey URL:
ti Interstate Highways Coordinate System: Web Mercator(EPSG:3857)
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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
Lava Flow accurate calculations of distance or area are required.
Background
46 Marsh or swamp Aerial Photography This product is generated from the USDA-NRCS certified data as
of the version date(s)listed below.
iRk Mine or Quarry
Soil Survey Area: Union County, North Carolina
O Miscellaneous Water Survey Area Data: Version 23,Sep 12,2022
Q Perennial Water Soil map units are labeled(as space allows)for map scales
v 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.
3) Slide or Slip
• Sodic Spot
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%
usm 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
AppendixA- 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)

1 / iN lltllPh.
360 218 327 .. 1a}
. GRID NORTH
ZONE X /
ZONE X z,b S7\ MAP SCALE 1 r" = 500' (1 : 6.000)
//—' 250 0 250 500 750 1,000
519 / /j/ �— i I FEET
• • — SJ6• . /• /• I ,,,� i ,.. N i METERS
n tsn inn•
ZONE AE ZONE AE
.>40 7< p` fc� �I PANEL 5550J
,...,/, `"' FIRM
Pfr '. -...
I
FLOOD INSURANCE RATE MAP
"' / All11k . NORTH CAROLINA
f t z z�1 m PANEL 5550
�• /z 4///., (SEE
LA OLOCATOR DIAGRAM OR MN'INDEX FOR FIRM PANEL
- ' CONTAINS
� - — .:__..� `' 51j(,rass:1'Branch COMMUNITY CID No PANEL SUI--lx.
le
FAIRVIEW TOWN OF 370024 5550
UNION COUNTY 370234 5550 J
I UNIONVILLE,TOWN OF 370564 5550 J
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6 _/
009 /'s. j, 524 TOWN OF ahouW be�tQed o map nrs nahraappllWtwm b te Community Number he tutted
/ ZONE X F, ammen nnrer
s2� UNION COS EFFECTIVE DATE MAP NUMBER
015 ig OCTOBER 16.2008 3710555000J
(0!
„ 525 ' a(
_ ._ I �� Stale of North Carolina
V Federal Emergency Management Agency
i
This is an official FIRMette showing a portion of the above-referenced flood map created from
•
the MSC FIRMette Web tool.This map does not reflect changes or amendments winch may have
been made subsequent to the date on the title block.For additional information about how to
526 \ make sure the map is current,please see the Flood Hazard Mapping Updates Overview Fact Sheet
iT available on the FEMA Flood Map Service Center home page at hops://mscfema.gov.

Appendix C
Supporting Calculations
NOAA Atlas 14 Precipitation Data
Time of Concentration
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
,ff"e°```"v,, Location name: Fairview,North Carolina, USA* ',,,u''I
Latitude:35.1305°,Longitude: -80.4945° ii
nnFin
%? Iii Elevation: 514 ft** i
�s.r U.+ w*source:ESRI Maps " "'
`a°` **source:USGS x""`" `'
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 -
1 2 5 10 25 50 100 200 500 1000
5-min 4.98 5.88 6.84 7.52 8.30 8.84 I 9.32 I 9.76 10.2 I 10.6
(4.58-5.42) (5.41-6.41) (6.26-7.44) (6.89-8.17) (7.57-9.00) (8.02-9.58)i (8.42-10.1) (8.77-10.6) (9.12-11.1) (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) 1 (6.95-8.39) I (7.21-8.80) 1 (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) (1.12-1.35) (1.29-1.54) (1.49-1.79) (1.64-1.98) (1.79-2.17) (1.93-2.36) (2.11-2.61) (2.24-2.80)
3-h r 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) (1.08-1.30) (1.20-1.45)_ (1.32-1.61) (1.44-1.77) (1.59-1.98) (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)I
24-hr 0.123 0.148 0.186 0.216 0.258 0.292 I 0.326 I 0.363 0.413 I 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)
2-day 0.072 0.087 0.108 0.125 0.149 0.168 0.187 0.208 0.236 0.259
(0.066-0.078) (0.080-0.094) (0.100-0.117) (0.115-0.136) (0.137-0.161) (0.154-0.182) (0.171-0.203) (0.189-0.226) (0.213-0.257) (0.232-0.282)
3-day 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)
4-day 0.040 0.048 0.060 0.069 0.081 0.091 I 0.102 0.112 I 0.128 I 0.140
(0.037-0.043) (0.045-0.052) (0.055-0.064) (0.063-0.074) (0.075-0.088) (0.084-0.099) (0.093-0.110) (0.103-0.122) (0.116-0.138) (0.126-0.152)
7-day 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)J(0.059-0.069) (0.065-0.076)1(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)I(0.059-0.069)
20-day 0.014 0.017 0.020 0.022 0.025 0.028 0.031 0.033 0.037 I 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)1(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)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not
checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

NOAA Atlas 14,Volume 2,Version 3
Location name: Monroe, North Carolina, USA* `nonn
Latitude: 35.1289°, Longitude: -80.4961°
Elevation: 536 ft**
�� *source:ESRI Maps " '�
�a en **source:USGS "`.,n,
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spring,Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1
Average recurrence interval(years)
Duration
1 2 5 10 25 50 _ 100 200 500 1000
5-min 0.415 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 I 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) (1.01-1.20) I (1.06-1.27) (1.12-1.34) (1.16-1.40) (1.20-1.47) (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) (1.06-1.26) (1.16-1.38) (1.28-1.52) (1.35-1.61) (1.41-1.69) (1.46-1.76) (1.51-1.84) (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) (1.25-1.48) (1.50-1.78) (1.68-2.00) (1.89-2.24) (2.03-2.42) (2.16-2.59) (2.28-2.74) (2.41-2.94) (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) (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 1.64 1.98 2.46 2.82 3.29 3.64 3.99 4.33 4.78 5.12
(1.50-1.80) (1.82-2.17) (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) (8.94-10.8) (9.77-11.9)
2-day 3.47 4.18 5.22 6.04 7.17 8.08 9.02 10.0 11.4 12.4
(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) (10.3-12.4) (11.2-13.6)
3-day 3.68 4.42 5.49 6.34 7.51 8.44 9.41 10.4 11.8 13.0
(3.41-3.98) (4.10-4.78) (5.08-5.94) (5.85-6.85) (6.90-8.11) (7.74-9.13) (8.60-10.2) (9.49-11.3) (10.7-12.8) (11.7-14.1)
4-day 3.89 4.67 5.76 6.63 7.84 8.80 9.80 10.8 12.3 I 13.5
(3.61-4.19) (4.33-5.03) (5.34-6.22) (6.13-7.15)_ (7.22-8.46) (8.09-9.51) (8.98-10.6) (9.89-11.7) (11.2-13.3) (12.2-14.6)
7-day 4.48 5.35 6.52 7.46 8.75 9.78 10.8 11.9 13.5 14.8
(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) (11.0-12.8) (12.4-14.6) (13.5-15.9)
10-day 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)_ (11.9-13.8) (13.3-15.4) (14.3-16.7)
20-day 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) (15.1-17.2) (16.7-19.1) (17.9-20.6)
30-day 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)
45-day 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)
60-day 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)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not
checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical

PDS-based depth-duration-frequency (DDF) curves
Latitude: 35.1289°, Longitude: -80.4961°
Average recurrence
interval
25 - - (years)
— 1
20 -- 2
a — 5
v 15 — 10
c I — 25
•y
;o — 50
- 100
V
,_ — 200
5 - — 500
-_--- 1.-
--- — 1000
_—
O r i i i t i • i i i i i i
c c c c c - �. �. . L >. >.>, >, >, >, >, >,>,
•- 'E •� '� '- .0 .0 L ••C -c r0 ro ro r0 N to ro ro /0
E N •A lb ry 4 v -1:3-0 -o -0 7 7 77
4' , - M Duration N N 1'6 4 ^ 6 N m y
kri
25 --
c
-- 20 -- • -- Duration
-c
a,a --- 5-min — 2-day
15 -- — 10-min — 3-day
0
'.0 15 min — 4-day
m
�o. 10 - f-- 30 min — 7-day
6 l�� — 60-min — 10-day
a _---_ _ �� — 2fir — 20 day
5 �1v — 3-hr — 30-day
nimnm, 6-hr 45-0ay
0 —I -- 12-hr — 60-day
i i , I , I i 24-hr
1 2 5 10 25 50 100 200 500 1000
Average recurrence interval (years)
NOAA Atlas 14,Volume 2,Version 3 Created(GMT):Fri Dec 22 15:04:33 2023
Back to Top
Maps & aerials
Small scale terrain

Time of Concentration

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CLIENT: Union County Prepared by: Prepared for:
Conveyance Swale Drainage Area PROJECT: Grassy Branch WRF Expansion Haze LOCATION: Monroe, North Carolina
(.9
0 37.5 75 150 225 300 375 MAP PCS Exhibit 9101 Southern Pine Blvd. Suite 250
© -- Feet DATA: Charlotte, NC 28273 UNIONCOUNTY
Phone: [phone] WATER
1 inch = 118 feet DATE: March 2024 I Prepared By:ZEK 'Reviewed By: MDP Firm NC License # C-0381
H&S Proj. # 30831-070

PROJECT: Grassy Creek SCS METHODS
SUB-BASIN ID: Basin 1 26 Time of Concentration(min.)
16 Lag Time
SHEET FLOW SEG#1 SEG#2
MANNING'S"n" 0.24
2-YEAR,24-HR. RAIN FALL(IN) 3.56
FLOW LENGTH(FT) 100
ELEV UP(NGVD FT) 564 _
ELEV DOWN(NGVD FT) 561
LAND SLOPE(FT/FT) 0.03 0 HR MIN
TIME OF CONCENTRATION(HRS) 0.19 0 0.19 11.504
SHALLOW CONCENTRATED FLOW SEG#1 SEG#2
SURFACE DESCRIPTION(P OR U) Short Grass Forrest
FLOW LENGTH(FT) 268 299
ELEV UP(NGVD FT) 561 544_
ELEV DOWN(NGVD FT) 544 536
WATERCOURSE SLOPE(FT/FT) 0.063 0.027_ 0
AVERAGE VELOCITY(FT/SEC) 1.75 0.60 0 HR MIN
TIME OF CONCENTRATION(HRS) 0.043 0.138 0 0.18 10.858
TRIANGULAR CHANNEL
CHANNEL FLOW SEG#1 SEG#2 SEG#3 SEG#4 SEG#5
TOP WIDTH(FT) 6_
DEPTH(FT) 1
AREA(SQ. FT) 3 0 0 0 0
WETTED PERIMETER(FT) 6.32 0.00 0 0 0
HYDRAULIC RADIUS(FT) 0.47 0.00 0 0 0
FLOW LENGTH(FT) 1050
ELEV UP(NGVD FT) 538
ELEV DOWN(NGVD FT) 514
CHANNEL SLOPE(FT/FT) 0.023 0.000 0 0 0
MANNING'S"n" 0.03
AVERAGE VELOCITY(FT/SEC) 4.56 0.00 0 0 0
TIME OF CONCENTRATION(HRS) 0.064 0.00 0 0 0 0.06 TIME OF CONCENTRATION(MIN)
TIME OF CONCENTRATION(MIN) 3.8 0.0 _
TOTAL TIME OF CONCENTRATION(HRS) 0.44 26 MIN.
LAG TIME(HRS) 0.26 16 MIN.

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-Developed
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= 0.39
I= 4.05
Drainage area(A)(ac)= 18.688
Q(cfs)= 29.5 10-year design storm
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)= 29.5
S,, 5(eft)=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)= 29.5
Hormel depth(ft)= 1.2
velocity(ft/s)
= 6.71
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)= 29.5
normal depth(ft)= 1.4
velocity(ft/s)= 4.95
Since velocity is greater than the 4.5 ft/s limit for grass lined,
PERMANENT LINING WILL BE REQUIRED
Perm-Temp Channel-Grassy Branch May 2024

Calculate normal depth and velocity for PERMANENT LINING
From product manual,n= 0.031
Flow(cfs)= 29.5
normal depth(ft)= 1.4
velocity(ft/s)= 4.83
Calculate shear stress
Shear stress(Ib/ft2)=(62.4 Ib/ft3)*(normal depth)*(slope)
shear stress(lb/ft 2 )= 1.51
Use permanent lining with a minimum shear stress
shear stress(Ib/ft2)= 2.00
Max Permissible Shear Max Velocity
Unvegetated Vegetated Unvegetated Vegetated
Lining Type Manufaturer and Model 'n' lbs/ft2 lbs/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
1 n value interpolated for normal depth of 1.0 ft
Temporary shear stress:1.75-2 lbs/sf
Permanent shear stress:2 lbs/sf
Perm-Temp Channel-Grassy Branch May 2024

USGS StreamStats Peak Flow

Grassy Branch WRF-StreamStats Report
Region ID: NC
Workspace ID: NC2024O1O4175934687OOO
Clicked Point (Latitude, Longitude): 35.13067,-80.49433
Time: 2024-01-04 13:00:03-0500
/ +
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•
' _ _ ;
Grassy Branch WRF 1629 Old Fish Rd,Monroe,NC Peak Flow
0 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 sqmi 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 5006]
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 sqmi 2014 5030]
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 sqmi 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-Flow 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 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 by the USGS or the 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 be held liable for any damages resulting from its authorized or unauthorized 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:4.19.2
StreamStats 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. Thursday,Jun 13 2024
Circular Culvert
Invert Elev Dn (ft) = 512.91 Calculations
Pipe Length (ft) = 22.00 Qmin (cfs) = 29.50
Slope (%) = 0.50 Qmax (cfs) = 29.50
Invert Elev Up (ft) = 513.02 Tailwater Elev (ft) = (dc+D)/2
Rise (in) = 30.0
Shape = Circular Highlighted
Span (in) = 30.0 Qtotal (cfs) = 29.50
No. Barrels = 1 Qpipe (cfs) = 29.50
n-Value = 0.012 Qovertop (cfs) = 0.00
Culvert Type = Circular Concrete Veloc Dn (ft/s) = 6.51
Culvert Entrance = Square edge w/headwall (C) Veloc Up (ft/s) = 7.57
Coeff. K,M,c,Y,k = 0.0098, 2, 0.0398, 0.67, 0.5 HGL Dn (ft) = 515.09
HGL Up (ft) = 514.87
Embankment Hw Elev (ft) = 516.13
Top Elevation (ft) = 518.70 Hw/D (ft) = 1.24
Top Width (ft) = 11.00 Flow Regime = Inlet Control
Crest Width (ft) = 20.00
Elev(tt) <Name> Hw Depth(ft)
519.00 I I 5.98
518.00 4.98
I
517.00 3.98
516.00 Inlet control 2.98
515.00 1.98
514.00 0.98
513.00 -0.02
512.00 -1.02
511.00 -2.02
0 5 10 15 20 25 30 35 40 45
GrculerCulvert HOL Embank
Reach(8)

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: 6/13/24
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 1. Determine the tailwater depth from channel chztracteristics 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 minimum tailwater condition.
If it is greater than half the pipe diameter. it is classified maximum condition.
Pipes that outlet onto wide Hat areas with no defined channel are assumed
to have a minimum tailwater condition unless reliable flood stage elevations
show otherwise.
Outlet pipe diameter, Do (in.) 30
Tailwater depth (in.) 26
Minimum/Maximum tailwater? Max TW (Fig. 8.06b)
Discharge (cfs) 29.5
Velocity (ft./s) 6.32
Step 2. Based on the tailwater conditions determined in step 1. enter Figure
8.06a or Figure 8.06b. and determine d;,_riprap size and minimum apron length
(La). The d;. size is the median stone size in a well-graded nprap apron.
Step 3. 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 2.

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
step 4. Determine the maximum stone diameter:
= i .5 x d c 0
Minimum TW Maximum TW
Max Stone Diameter, dmax (ft.) 0.75 0.15
Step 5. Determine the apron thickness:
Apron thickness = 1.5 x
Minimum TW Maximum TW
Apron Thickness(ft.) 1.125 0.225
Step 6. Fit the riprap apron to the site by making it level for the minimum
length, La. from Figure 8.06a or Figure 8.06b. Extend the apron farther
downstream and along channel banks until stability is assured. Keep the
apron as straight as possible and align it with the flow of the receiving stream.
Make any necessary alignment bends near the pipe outlet so that the entrance
into the receiving stream is straight.
Some locations may require lining of the entire channel cross section to assure
stability.
It may be necessary to increase the size of riprap where protection of the
channel side slopes is necessary (Appendix S.05). Where 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)
30
Outlet W • Do + L a 90 1-
•
pipe ' . •
diameter (Do)
La _.1 50 - --�..__.. '�igh
w ter 0.500 i : 1. ::.I / r
PO
ve
t•P -.:It _ '11 I •
i . I' 1 • -, . 4, .er'4
•
,•,4 1 M Il11:111'I iii u .A 'g .0 t . .
011 1111111 : i1111 ir/Aliiril
10 -. :..: :::: - �:,. !rnit .• •O
.ii
. Ater
- 25 ,i i 1 1 ri I.211r1r: Asee ! E
v , 15 sue/. 11."-
I 0
v = 5 �...•
3 5 10 20 51 100 200 500 1000
Discharge(tt3/sec)
Curves may not be extrapolated
Figure 8.06a Design of outlet protection protection from a round pipe flowing full,minimum tailwater condition(Tw<0-5 diameter)
Rev.12 93 8.06.3

Figure 8.06b: Design of outlet protection from a round pipe flowing full, maximum
tailwater condition (Tw>=0.5 diameter)
3D0
}Outlet U = Do + 0.4La 120 1-pipe t f I
diameter(Do);r-- la I 110 r .
;-
Q Tai l•!_a_w 3 2.5D0 ( l •
100 r
. i i A
/ . •
oC
Q 70 --.--- v _a
ec'se 60 r
v 1 tiii: , o
/50H
a .I
40 ... I . , 3
30 .t.. , b : .. . .1Ir ',.. if : . .. ._. • _ t
, , ,
. . ... . .. . .. ..
.4 , ../g . ! ,.. , _...... , 07ArrAisi:47., 2 :a.,
20 1. , , . g reprirkilir Afil
l /./ "P. .4
v= is. � �. ,
5 � o
1 *:•43 :
V g 10 6 LAIIPACII0j10. 00°F..,4100r,eidOrArdjrir* * * I
1 .
tiT
3 5 10 20 50 100 200 500 1000
Discharge(ft3/sec)
Curves may not be extrapolated.
Figure 8.06b Design of outlet protection from a round pipe flowing full.maximum tailwater condition(T. >0 5 diameter)
8.06..1 Rev.11'93

Appendix D
USGS StreamStats Delineation

Crooked Creek/Grassy Branch StreamStats Report
Region ID: NC
Workspace ID: NC202402091 84920504000
Clicked Point(Latitude, Longitude): 35.13126,-80.49389
Time: 2024-02-09 13:50:00-0500
'52-11
Mint Hill.
ma..
485
Matthews
/ a
Pines(\ Indian ii
\
\Fort Mill *.iC111C`
Ran
;c.d.Hill York Co - - - airport
6ry anj Airperr ,h 8�.f// """'-' F:•1 .M on roe Wingate Marshville
'I` •
StreamStats report generated for the point where Grassy Branch comes together with Crooked Creek(adjacent to Grassy
Branch WRF).
0 Collapse All
Basin Characteristics
Parameter Code Parameter Description Value Unit
DRNAREA Area that drains to a point on a stream 44.2 square miles
LCO6IMP Percentage of impervious area determined from NLCD 2006 impervious dataset 8.91 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
PCTREGS 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
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
PCTREGS 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-Row 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 by the USGS or the 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 be held liable for any damages resulting from its authorized or unauthorized 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

DEMLR USE ONLY
Date Received Fee Paid Permit Number
Applicable Rules: E Coastal SW-1995 E Coastal SW-2008 ❑Ph II-Post Construction
(select all that apply) ❑ Non-Coastal SW-HQW/ORW Waters ❑ Universal Stormwater Management Plan
❑ Other WQ Mgmt Plan:
State of North Carolina
Department of Environment and Natural Resources
Division of Energy, Mineral and Land Resources
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Project Name(subdivision,facility,or establishment name-should be consistent with project name on plans,
specifications,letters,operation and maintenance agreements,etc.):
Grassy Branch WRF Expansion
2. Location of Project(street address):
1629 Old Fish Road
City:Monroe County:Union Zip:28110
3. Directions to project(from nearest major intersection):
Nearest major intersection:NC-218 and US-601 (Concord Highway)
Travel east on NC-218 E from nearest major intersection,turn right ont Unionville-Brief Rd
Continue 0.7 miles on Unionville-Brief Rd,turn left onto Old Fish Rd.WRF on left in 0.6 miles.
4. Latitude:35°7'49.44" N Longitude:80°29'39.12"W of the main entrance to the project.
II. PERMIT INFORMATION:
1.a.Specify whether project is(check one): New [Modification ❑ Renewal w/ Modificationt
tRenewals with modifications also requires SWU-102-Renewal Application Form
b.If this application is being submitted as the result of a modification to an existing permit,list the existing
permit number ,its issue date(if known) ,and the status of
construction: ['Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification
2. Specify the type of project(check one):
®Low Density ['High Density ❑Drains to an Offsite Stormwater System ['Other
3. If this application is being submitted as the result of a previously returned application or a letter from
DEMLR requesting a state stormwater management permit application,list the stormwater project number,
if assigned,SW3240204 and the previous name of the project,if different than currently
proposed,n/a
4.a.Additional Project Requirements (check applicable blanks;information on required state permits can be
obtained by contacting the Customer Service Center at 1-877-623-6748):
❑CAMA Major ®Sedimentation/Erosion Control:1.83 ac of Disturbed Area
❑NPDES Industrial Stormwater 0404/401 Permit:Proposed Impacts
b.If any of these permits have already been acquired please provide the Project Name,Project/Permit Number,
issue date and the type of each permit:N/A
5. Is the project located within 5 miles of a public airport? No ❑Yes
If yes,see S.L.2012-200,Part VI:http://portal.ncdenr.org/web/lr/rules-and-regulations
Form SWU-101 Version Oct.31,2013 Page 1 of 6

III. CONTACT INFORMATION
1.a.Print Applicant/ Signing Official's name and title(specifically the developer,property owner,lessee,
designated government official,individual,etc.who owns the project):
Applicant/Organization:Union County
Signing Official&Title:Thomas Mann
b.Contact information for person listed in item la above:
Street Address:500 N.Main Street,Suite 600
City:Monroe State:NC Zip:28112
Mailing Address (if applicable):
City: State: Zip:
Phone: (704 ) 292-2560 Fax: ( )
Email:[e-mail]
c.Please check the appropriate box.The applicant listed above is:
® The property owner(Skip to Contact Information,item 3a)
[' Lessee*(Attach a copy of the lease agreement and complete Contact Information,item 2a and 2b below)
❑ Purchaser*(Attach a copy of the pending sales agreement and complete Contact Information,item 2a and
2b below)
n Developer*(Complete Contact Information,item 2a and 2b below.)
2.a.Print Property Owner's name and title below,if you are the lessee,purchaser or developer. (This is the
person who owns the property that the project is located on):
Property Owner/Organization:
Signing Official&Title:
b.Contact information for person listed in item 2a above:
Street Address:
City: State: Zip:
Mailing Address (if applicable):
City: State: Zip:
Phone: ( ) Fax: ( )
Email:
3.a. (Optional)Print the name and title of another contact such as the project's construction supervisor or other
person who can answer questions about the project:
Other Contact Person/Organization:Hazen and Sawyer
Signing Official&Title:Michael D.Parker
b.Contact information for person listed in item 3a above:
Mailing Address:9101 Southern Pine Boulevard,Suite 250
City:Charlotte State:NC Zip:28273
Phone: (704 ) 940-8910 Fax: ( )
Email:[e-mail]
4. Local jurisdiction for building permits:Union County Building Code Enforcement
Point of Contact:Jesse Langston Phone#: (704 ) 283-3594
Form SWU-101 Version Oct. 31,2013 Page 2 of 6

IV. PROJECT INFORMATION
1. In the space provided below,briefly summarize how the stormwater runoff will be treated.
This project meets the low density requirements of having less than 24% impervious area.Therefore,
stormwater runoff was designed to be treated by dispersed flow from sheet flow and a rip rap lined outfall
to areas of heavy vegetation.
2.a.If claiming vested rights,identify the supporting documents provided and the date they were approved:
n Approval of a Site Specific Development Plan or PUD Approval Date:
n Valid Building Permit Issued Date:
n Other: Date:
b.If claiming vested rights,identify the regulation(s)the project has been designed in accordance with:
n Coastal SW-1995 ❑ Ph II-Post Construction
3. Stormwater runoff from this project drains to the Yadkin Pee-Dee River basin.
4. Total Property Area:1.88 acres 5. Total Coastal Wetlands Area:0 acres
6. Total Surface Water Area:0.48 acres
7. Total Property Area(4)-Total Coastal Wetlands Area (5) -Total Surface Water Area(6) =Total Project
Area+:1.40 acres
+ Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area
between the banks of streams and rivers, the area below the Normal High Water(NHW) line or Mean High Water
(MHW)line, and coastal wetlands landward from the NHW(or MHVV)line. The resultant project area is used to
calculate overall percent built upon area (BUA). Non-coastal wetlands landward of the NHW(or MHVV)line may
be included in the total project area.
8. Project percent of impervious area: (Total Impervious Area/ Total Project Area)X 100 =19.3
9. How many drainage areas does the project have?2 (For high density, count 1 for each proposed engineered
stormwater BMP. For low density and other projects, use 1 for the whole property area)
10. Complete the following information for each drainage area identified in Project Information item 9. If there
are more than four drainage areas in the project,attach an additional sheet with the information for each area
provided in the same format as below.
Basin Information Drainage Area 1 Drainage Area 2 Drainage Area T Drainage Area
Receiving Stream Name Crooked Creek Grassy Branch Crooked Creek
Stream Class * C C C
Stream Index Number* 13-17-20 13-7-20-3 13-17-20
Total Drainage Area(sf) 17,424 43,560 60,984
On-site Drainage Area(sf) 17,424 43,560 60,984
Off-site Drainage Area(sf) 0 0 0
Proposed Impervious Area**(sf) 6,415 16,300 22,715
Impervious Area**(total) 7.4 23.2 19.3
Impervious'Surface Area Drainage Area 1 Drainage Area 2 Drainage Area T Drainage Area
On-site Buildings/Lots (sf) 300 2,015 2,315
On-site Streets (sf) 615 6,540 7,155
On-site Parking (sf) 0 0 0
On-site Sidewalks (sf) 0 0 0
Other on-site (sf) 0 0 0
Future(sf) 0 0 0
Off-site (sf) 0 0 0
Existing BUA***(sf) 5,500 7,745 13,245
Total (sf): 6,415 16,300 22,715
* Stream Class and Index Number can be determined at: http://portal.ncdenr.org/web/wq/ps/csu/classifications
** Impervious area is defined as the built upon area including, but not limited to, buildings, roads,parking areas,
sidewalks,gravel areas, etc.
Form SWU-101 Version Oct. 31,2013 Page 3 of 6

***Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that
is to be removed and which will be replaced by new BUA.
11. How was the off-site impervious area listed above determined?Provide documentation.N/A
Projects in Union County: Contact DEMLR Central Office staff to check if the project is located within a Threatened&
Endangered Species watershed that may be subject to more stringent storm water requirements as per 15A NCA C 02B.0600.
V. SUPPLEMENT AND O&M FORMS
The applicable state stormwater management permit supplement and operation and maintenance (O&M)forms
must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded
from http://portal.ncdenr.org/web/wq/ws/su/bmp-manual.
VI. SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Energy,Mineral and
Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application
instruction sheet and BMP checklists are available from
http://portal.ncdenr.org/web/wq/ws/su/statesw/forms docs. The complete application package should be
submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the
interactive online map at http://portal.ncdenr.org/web/wq/ws/su/maps.)
Please indicate that the following required information have been provided by initialing in the space provided
for each item.All original documents MUST be signed and initialed in blue ink. Download the latest versions
for each submitted application package from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms docs.
I itls
1. Original and one copy of the Stormwater Management Permit Application Form.
2. Original and one copy of the signed and notarized Deed Restrictions&Protective Covenants H A'
Form. (if required as per Part VII below) ■■��
3. Original of the applicable Supplement Form(s) (sealed,signed and dated)and O&M riF
agreement(s)for each BMP.
4. Permit application processing fee of$505 payable to NCDENR. (For an Express review,refer to MP
http://www.envhelp.org/pages/onestopexpress.html for information on the Express program
and the associated fees. Contact the appropriate regional office Express Permit Coordinator for
additional information and to schedule the required application meeting.)
5. A detailed narrative (one to two pages) describing the stormwater treatment/management for
6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the /'l!-
receiving stream drains to class SA waters within 1/2 mile of the site boundary,include the 1/2
mile radius on the map.
7. Sealed,signed and dated calculations (one copy). MP
8. Two sets of plans folded to 8.5"x 14" (sealed,signed, &dated),including: MP
a. Development/Project name.
b. Engineer and firm.
c. Location map with named streets and NCSR numbers.
d. Legend.
e. North arrow.
f. Scale.
g. Revision number and dates.
h. Identify all surface waters on the plans by delineating the normal pool elevation of
impounded structures,the banks of streams and rivers,the MHW or NHW line of tidal
waters,and any coastal wetlands landward of the MHW or NHW lines.
• Delineate the vegetated buffer landward from the normal pool elevation of impounded
structures,the banks of streams or rivers,and the MHW(or NHW) of tidal waters.
i. Dimensioned property/project boundary with bearings&distances.
j. Site Layout with all BUA identified and dimensioned.
k. Existing contours,proposed contours,spot elevations,finished floor elevations.
1. Details of roads,drainage features,collection systems,and stormwater control measures.
m.Wetlands delineated,or a note on the plans that none exist. (Must be delineated by a
qualified person. Provide documentation of qualifications and identify the person who
made the determination on the plans.
n. Existing drainage (including off-site),drainage easements,pipe sizes,runoff calculations.
o. Drainage areas delineated (included in the main set of plans,not as a separate document).
Form SWU-101 Version Oct. 31,2013 Page 4 of 6

p. Vegetated buffers (where required).
9. Copy of any applicable soils report with the associated SHWT elevations(Please identify '
elevations in addition to depths)as well as a map of the boring locations with the existing
elevations and boring logs.Include an 8.5"x11"copy of the NRCS County Soils map with the
project area dearly delineated. For projects with infiltration BMPs,the report should also
include the soil type,expected infiltration rate,and the method of determining the infiltration rate.
(Infiltration Devices submitted to WiRO:Schedule a site visit for DEMLR to verify the SHWT prior
to submittal, [phone].)
10. A copy of the most current property deed.Deed book:959 Page No: 874
11. For corporations and limited liability corporations (LLC):Provide documentation from the NC /-
Secretary of State or other official documentation,which supports the titles and positions held
by the persons listed in Contact Information,item la,2a,and/or 3a per 15A NCAC 2H.1003(e).
The corporation or LLC must be listed as an active corporation in good standing with the NC
Secretary of State,otherwise the application will be returned.
http://www.secretary.state.nc.us/Corporations/CSearch.aspx
VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
For all subdivisions,outparcels,and future development,the appropriate property restrictions and protective
covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed
BUA allocations vary,a table listing each lot number,lot size,and the allowable built-upon area must be
provided as an attachment to the completed and notarized deed restriction form. The appropriate deed
restrictions and protective covenants forms can be downloaded from http://portal.ncdenr.org/web/lr/state-
stormwater-forms does.Download the latest versions for each submittal.
In the instances where the applicant is different than the property owner,it is the responsibility of the property
owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring
that the deed restrictions are recorded.
By the notarized signature(s)below,the permit holder(s) certify that the recorded property restrictions and
protective covenants for this project,if required,shall include all the items required in the permit and listed
on the forms available on the website,that the covenants will be binding on all parties and persons claiming
under them,that they will run with the land,that the required covenants cannot be changed or deleted
without concurrence from the NC DEMLR,and that they will be recorded prior to the sale of any lot.
VIII. CONSULTANT INFORMATION AND AUTHORIZATION
Applicant: Complete this section if you wish to designate authority to another individual and/or firm(such as a
consulting engineer and/or firm) so that they may provide information on your behalf for this project(such as
addressing requests for additional information).
Consulting Engineer:Michael Parker,P.E.
Consulting Firm:Hazen and Sawyer
Mailing Address:9101 Southern Pine Boulevard,Suite 250
City:Charlotte State:NC - Zip:28273
Phone: (704 ) 940-8910 Fax: (
Email:[e-mail]
IX. PROPERTY OWNER AUTHORIZATION(if Contact Information, item 2 has been filled out, complete this
section)
I, (print or type name of person listed in Contact Information, item 2a)_ ,certify that I
own the property identified in this permit application,and thus give permission to (print or type name of person
listed in Contact Information, item la) with(print or type name of organization listed in
Contact Information, item 1a) _to develop the project as currently proposed. A copy of
the lease agreement or pending property sales contract has been provided with the submittal,which indicates the
party responsible for the operation and maintenance of the stormwater system.
Form SWU-101 Version Oct. 31,2013 Page 5 of 6

As the legal property owner I acknowledge,understand,and agree by my signature below,that if my designated
agent(entity listed in Contact Information,item 1)dissolves their company and/or cancels or defaults on their
lease agreement,or pending sale,responsibility for compliance with the DEMLR Stormwater permit reverts back
to me,the property owner.As the property owner,it is my responsibility to notify DEMLR immediately and
submit a completed Name/Ownership Change Form within 30 days;otherwise I will be operating a stormwater
treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility
without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement
action including the assessment of civil penalties of up to$25,000 per day,pursuant to NCGS 143-215.6.
Signature: Date:
I, ,a Notary Public for the State of ,County of
,do hereby certify that personally appeared
before me this_day of and acknowledge the due execution of the application for
a stormwater permit. Witness my hand and official seal,
SEAL
My commission expires
X. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in Contact Information, item la) Thomas Mann
certify that the information included on this permit application form is,to the best of my knowledge,correct and
that the project will be constructed in conformance with the approved plans,that the required deed restrictions
and protective covenants will be recorded,and that the proposed project complies with the requirements of the
applicable stormwater rules under 15A NCAC 2H.1000 and any other applicable state stormwater requirements.
Signature: /t Date: "/ 2`{
I, .4 r71-L t/ 57--0.4-7 a Notary Public for the State of/cl,-i�z.-E,/-1.-•k County of
i..s ,do hereby certify that 7o-,mac /'Yew personally appeared
before me this / d y of ,41, ; 1 , ZU2 1,,and acknowle�fg th d execution of the application for
a stormwater permit. Witness my hand and official seal, /t 7 ��
���uuwwnV
oL G,4$ a 4 .
a o...a.... Q as
_ Nee '�'Z $' SEAL
S NOTARY '; a
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Form SWU-l01 Version Oct. 31,2013 Page 6 of 6

Supplement-EZ Forms

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Grassy Branch WRF Expansion
2 Project Area(ac) 1.4
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.48
5 Is this project High or Low Density? Low
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated 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 SCMs:
11 Infiltration System 0 _
12 'Bioretention Cell I _ 0 _ _
13 Wet Pond I _ 0 _
14 Stormwater Wetland _ 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 Treatment Swale I 0 _
22 Dry Pond 0 _ _
23 StormFilter 0
24 Silva Cell 0
25 Bayfilter 0
26 Filterra 0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: 1 _ Michael Parker,P.E.
28 Organization: I Hazen and Sawyer
29 Street address: 9101 Southern Pine Boulevard,Suite 250
30 City,State,Zip: Charlotte,NC 28273
31 Phone number(s): [phone]
32 Email: [e-mail]
Certification Statement
I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the
Information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans,
specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here.
Desajner
CARp�i
(-(6
��F�SSlpi9<ti ( n�
SEAL
EpL S jnalure of Designer
26432 �'
FNGINE.�Q` 4�
y4FCD. 10"' � 1 LI P.bV-LI
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 2
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site LD 1 LD 2
Dispersed flow& Dispersed flow&
4 Type of SCM vegetated swales Dispersed flow vegetated swales
5 Total drainage area(sq ft) 60,984 17,424 43,560
6 Onsite drainage area(sq ft) 60,984 17,424 43,560
7 Offsite drainage area(sq ft) n/a n/a n/a
8 Total BUA in project(sq ft) 22715 sf 6415 sf 16300 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) n/a n/a n/a
New BUA not on subdivided lots(subject to
10 permitting)(sf) 9470 sf 915 sf 8555 sf
11 Offsite BUA(sq ft) n/a n/a n/a
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) sf sf sf
-Sidewalk(sq ft) sf sf sf
-Roof(sq ft) 2315 sf 300 sf 2015 sf
-Roadway(sq ft) 7155 sf 615 sf 6540 sf
-Future(sq ft) sf sf sf
-Other,please specify in the comment box
below(sq ft) sf sf sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) sf sf sf
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) sf sf sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 13245 sf 5500 sf 7745 sf
16 Existing BUA that is already permitted(sq ft) sf sf sf
17 Existing BUA that will be removed(sq ft) sf sf sf
18 Percent BUA 7% 23% 19%
19 Design storm(inches) 7.5 in 7.5 in 7.5 in
20 Design volume of SCM(cu ft) n/a n/a n/a
21 Calculation method for design volume n/a 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
constructinn is cmmnlated

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.
Drainage Pervious
Swale BUA Q Slope Venow V.ciwi Flow depth
Area area
(ac) (cfs) (%) (fps) (fps) (ft)
(ac) (ac)
1 18.70 1.67 17.03 0.39 29.50 1.70 16.00 4.83 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: 0 Location(s):
Disconnected Impervious Surface Present: No Location(s):
User Defined SCM Present: No Location(s):
Low Density Present: Yes Type: Vegetated swales/roadside ditches
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
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: c. Date: 1--1 —
„L "'Y LI- s c;,CT ,a Notary Public for the State of /��r /L d-e.-.,.0..,/0"L-'.
County of ,do hereby certify that �,�.1 s „X. " - -�—
personally appeared before me this /S� day of /7 f r-;/ 2 O y it and
acknowledge the due execution of the Operatio.s a /ato ance Agreement.
Witness my hand and official seal, ,i^k
N',tounneyy
s�4"4M- G,4,9�'h•,a
NOTARY •
r.
• •
• �» •
G4. 'PUBLIC
® •
� m� My Commission Expires 10/712025
�••••••••j 4,, My commission expires
rots'44b COO
STORM-EZ 3/28/2024
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.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-
erosive gullies have sod (or plant with other appropriate species)and water until
Vegetated receiving formed. established. Provide lime and a one-time fertilizer application.
areas
Trees and/or other woody Remove the trees and woody vegetation from the swale,
vegetation are present in regrade the swale if necessary and re-establish grass as
the swale. shown on the approved plans.
Trash/debris is present. Remove the trash/debris.
Areas of bare soil and/or Regrade the soil if necessary to remove the gully, and then re-
erosive gullies have sod (or plant with other appropriate species)and water until
formed. established. Provide lime and a one-time fertilizer application.
Sediment covers the Remove sediment and dispose in an area that will not impact
grass at the bottom of the streams or SCMs. Re-sod if necessary.
Vegetated conveyances swale.
/swales/roadside Regrade the slopes to the permitted configuration per the
ditches (other than curb The side slope is steeper approved plan and reestablish vegetation. If as-built or existing
outlet swales) than the approved conditions do not allow the slopes to be regraded, contact the
configuration.
applicable permitting agency.
Determine the source of the problem: soils, hydrology,
Grass is dead, diseased disease, etc. Remedy the problem and replace plants.
or dying. Provide a one-time fertilizer application to establish the ground
cover if necessary.
Trees and/or other woody Remove the trees and woody vegetation from the vegetated
vegetation are present in conveyance, regrade the vegetated conveyance if necessary
the vegetated and re-establish grass as shown on the approved plans.
conveyance.
1

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

Hazeli Hazen and Sawyer
9101 Southern Pine Blvd.,Suite 250
Charlotte,NC 28273•704.357.3150
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)t,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)
shapefiles5. To determine the presence of historic or cultural resources, Hazen consulted the North
Carolina State Historic Preservation Office's HPOWEB 2.0 web application.
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.
1 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.
0 3 United States Department of Agriculture,Natural Resources Conservation Service,Web Soil Survey.
https://websoilsurvey.nrcs.usda.gov/.
4 United States Fish and Wildlife Service,Information for Planning and Consultation..
https://ipac.ecosphere.fws.gov/.
5 North Carolina Natural Heritage Program,Natural Heritage Element Occurrence Shapefiles.
6 North Carolina Historic Preservation Office,HPOWEB 2.0.
https://nc.maps.arcgis.com/home/item.html?id=d2d04d8 d7e03403 f889419526e682529.
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(Helianthus 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

Kemak, Zachary
From: Burkhard, Michael <[e-mail]>
Sent: Thursday, March 14, 2024 7:58 AM
To: Parker, Michael D.
Cc: Holland, Brianna; Kemak, Zachary; Pitner, Andrew; Brown, Devynne M
Subject: Grassy Branch WRF Expansion
Attachments: D00031324-03132024.pdf;Aerial 1.pdf
Some people who received this message don't often get email from [e-mail]. Learn why this is important
Caution! External email-think before you click
Good morning, all,
On Monday March 11, 2024, my colleague Devynne Brown and I conducted a stream
assessment of the water feature located at 1629 Old Fish Road, Monroe, NC 28110.
Due to the length and different characteristics, we decided to break it up into 4 different
reaches. Attached is our stream assessment worksheet for each reach and an aerial
photo of the site and the location of each segment.
Our conclusion is that the entire water feature is an Intermittent Stream.
Let us know if you have any questions.
Thank you
Michael B
Michael W. Burkhard
Environmental Specialist II
Division of Water Resources
Mobile Phone:[phone]
MRO Main Phone: [phone]
Direct Office Phone: [phone]
Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized
state official.
1

NC DWQ Stream Identification Form Version 4>1l
Date: f A//f,/2'OZ�.I projecuSite j Latitude: -C� `'1� /� �
Evaluator: (ch4e' 'e T Jy County: - fill--�°/ c
Total Points: Stream Qete r circle one) Other
Stream is at least intermittent Ephemeral Intermittent Perennial e.g. uad Name:
if>_19 or perennial if>_30* p �'
A. Geomorphology (Subtotal = I U ) Absent Weak Moderate Strong
1 a.Continuity of channel bed and bank 0 1 3
2.Sinuosity of channel along thalweg V 1 2 3
3.In-channel structure:ex.riffle-pool,step-pool, 0 1 3
ripple-pool sequence
4. Particle size of stream substrate 0 1 (2„) 3
5.Active/relict lloodplain 0 CO 2 3
6.Depositional bars or benches 0 O 2 3
7.Recent alluvial deposits 0 0 2 3
8, Headcuts 1 2 3
9.Grade control 0 .5 1 1.5
10. Natural valley 0 5 1 1.5
11. Second or greater order channel 4 o=0 Yes=3
a artificial ditches are not rated;see discussions in manual
B. Hydrology (Subtotal= .7 .A .- ) -
12. Presence of Baseflow 0 1 0 3
13. Iron oxidizing bacteria 411,0 1 2 3
14. Leaf litter 1.5 1 0.5 0
15.Sediment on plants or debris 0 0sm 1 1.5
16. Organic debris lines or piles 0 *5 - 1 1.5
17. Soil-based evidence of high water table? No=0 Yes KO
C. Biology (Subtotal= 4,,5--)
18. Fibrous roots in streambed 3 2 1 0
19. Rooted upland plants in streambed 3 2 1 - 0
20. Macrobenthos(note diversity and abundance) 1 2 3
21.Aquatic Mollusks (o) 1 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5
24.Amphibians 0.5 1 1.5
25.Algae 0 0.5 1 1.5
26.Wetland plants in streambed FACW=0.75; OBL=1.5 Otherl°0 )
*perennial streams may also be identified using other methods.See p.35 of manual.
Notes:
Sketch:
\„N..*.j -
,,4 ,,7___----

ti
NC DWQ Stream Identification Form Version 4ell
Date: /ii `'vim , Pro'ectISite' c Latitude:` � / 2
Evaluator: ( CA.g / }e t\jc County: ON Longitude: ' - 9 L -
,.
Total Points: V Stream Det •I,'.- 'role one) Other R
Stream is at least intermittent Ephemeral erennial e.g.Quad Name
if?19 orperennial if>_30 p
A. Geomorphology (Subtotal =44
) Absent Weak Mod rate Strong
1a.Continuity of channel bed and bank 0 1 2 3
2.Sinuosity of channel along thalweg 0 CO 2 3
3. In-channel structure:ex. riffle-pool,step-pool, 0 1 ''y 3
ripple-pool sequence
4,Particle size of stream substrate 0 1 CO 3
5.Active/relict floodplain 0 ci0 2 3
6.Depositional bars or benches 0 C.L3 2 3
7.Recent alluvial deposits i 2 3
8. Headcuts 1 2 3
9.Grade control 0 .5, 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel o=0 Yes=3
a artificial ditches are not rated;see discussion 'n manual
B. Hydrology (Subtotal= 11‘-, )
12. Presence of Basefiow 0 1 2 3
13. Iron oxidizing bacteria V 1 2 3
14. Leaf litter Oa& 1 0.5 0
15.Sediment on plants or debris 0 0 5 1 1.5
16.Organic debris lines or piles 0 (7,72, ) 1 1.5
17. Soil-based evidence of high ter to le? No=0 Yes
C. Biology (Subtotal= ) .`�'
18. Fibrous roots in streambed 3 1 0
19. Rooted upland plants in streambed 3 1 - 0
20. Macrobenthos(note diversity and abundance) _ (1 1 2 3
21.Aquatic Mollusks _ 1 2 3
22. Fish 0.5 1 1.5
23. Crayfish 0.5 1 1.5 -_
24.AmphibiansCO) 0.5 1 1.5
25.Algae 0 0.5 1 1.5
26.Wetland plants in streambed FACW=0.75; OBL=1.5 er=0
*perennial streams may also be idented using other methods.See p.35 of manual.
Notes:
Sketch:
CT
‘ 2 y

NC DWQ Stream Identification Form Version 4.11
Date: 3//-/ /062ZSI PrajectlSite' %' Latitude:
Evaluator: �,�%c•g Igoew,v)wi County: moo Longitud _ ; 1
Totals Points: Stream Dete i circle one) Other
Stream is at least intermittent Ephemeral Intermittent erennial e.g.Quad Name:
if>_19 or erenniaf ig?30* F'
A. Geomorphology (Subtotal= d ice ) Absent Weak Mode to Strong
1a.Continuity of channel bed and bank 0 1 Ci 3 _
2.Sinuosity of channel along thalweg 0 2 3
3. In-channel structure:ex. riffle-pool,step-pool, 0 1 3
ripple-pool sequence
4. Particle size of stream substrate 0 1 3
5.Active/relict floodplain 0 (14 2 3 5.
6. Depositional bars or benches 0 r-1 2 3
55
7.Recent alluvial deposits 0 2 3
8. Headcuts ) 1 2 3
9.Grade control 0 0) 1 1.5
10. Natural valley 0 0.5 1 1.5
11. Second or greater order channel o= Yes=3
a artificial ditches are not rated;see discussions in manual
B. Hydrology (Subtotal= ) _
12. Presence of Baseflow 0 1 CO 3
13. Iron oxidizing bacteria 1 2 3
14. Leaf litter _ (1. 1 0.5 0
15.Sediment on plants or debris �. 0.5 1 1.5
_16. Organic debris lines or piles 0 0.5) 1 1.5
17. Soil-based evidence of high water able? No=0 Yes=3
C. Biology (Subtotal= i27, ,> )
18. Fibrous roots in streambed 3 (-2 ) 1 0_
19. Rooted upland plants in streambed 2 1 - 0
20. Macrobenthos(note diversity and abundance) 0 1 2 3
21.Aquatic Mollusks 0 2 3
22. Fish CO, 0.5 1 1.5
23. Crayfish 0 0.5 1 1.5 i
24.Amphibians 0.5 N 1 1.5 i
25.Algae 0 0.5 1 1.5
26.Wetland plants in streambed FACW=0.75; OBL=1.5 c
y=0
_.„)
*perennial streams may also be idented using other methods.See p.35 of manual.
Notes:
Sketch:

NC DWQ Stream Identification Form Version 4>!1
Date: 3/fit `2a . Projeci/Sitee &" 0 Latitude: 0(�' ri .�-
Evaluator: ICounty: UN Longitude
Total Points: Stream Dete nation trcle one) Other r.
Stream is at least intermittent
if_>19 or perennial if>_30* Epheme Intermittent erenniai e.g.Quad a
A. Geomorphology (Subtotal= i ) Absent Weak a erate Strong
1a.Continuity of.channel bed and bank 0 12 3
2.Sinuosity.of channel along thalweg 0 1 2..) 3
3.In-channel structure:ex.riffle-pool,step-pool, 0 1 ', 3
ripple-pool sequence v.�/
4. Particle size of stream substrate 0 1 3
5.Active/relict floodplain 0 ea) 2 3
6.Depositional bars or benches 0 1 3
7.Recent alluvial deposits 0 1 2 - 3
8. Headcuts _ CO 1_ 2 3
9.Grade control 0 `�.5 1 1.5
10. Natural valley 0 - (0.5 1 1.5
11. Second or greater order channel No= Yes=3
a artificial ditches are not rated;see discussions in manual
B. Hydrology (Subtotal= )
12. Presence of Baseflow 0 1 C 3
13. Iron oxidizing bacteria CO 1 2 3
14. Leaf litter 1.5 1 0.5 0
15. Sediment on plants or debris 0 1 1.5
16.Organic debris lines or piles 0 (15 1 1.5
17. Soil-based evidence of high water table? No=0 s='
C. Biology (Subtotal= + )
18. Fibrous roots in streambed 3 C2 1 0
19. Rooted upland plants in streambed 3 2 J 1 "- 0
20. Macrobenthos(note diversity and abundance) C 1 2 3
21.Aquatic Mollusks 0 -1` 2 3
22. Fish 0 0.5 1 1.5
23. Crayfish 0.5 1 1.5
24.Amphibians 0.5 1 1.5
25.Algae 0 0.5 ) 1 1.5
26.Wetland plants in streambed FACW=0.75; OBL=1.5(0-ther=b
perennial streams may also be identified using other methods.See p.35 of manual. il
Notes:
Sketch:
�i 2
(--------- ',. 3

Grassy Branch Stream Call - Legend
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Appendix G
Current Property Deed

BK959PG814
$10.00
(01111MA
Fled to record
ReelEstateCate 4-11-qQ
/ Excl»Ta ilfie 3'.So p' �jp
JUDY G.F ICE,Register of[fob
thon Canty, Mane, Nath Calks
•
Mooratry T1a.,eodc mI/rp1 •
Excise Tex$ {0•00
Tax Lot No. Parcel Identifier No. Portion of 08-090-007
Verified by County as the day of , 19_by
Mai1 after recording to P.O. Box 218, Monroe, N. C. 28111-0218
This instrument was prepared by Donald C. Perry
Brief Description for the index 1.88 acres, Goose Creek Twp,
NORTH CAROLINA GENERAL WARRANTY DEED
THIS DES trede this April I () , 1997, by and between
GRANTOR GRANTEE,
BURbN CIO Z (widower) UNION 07twrY, a political subdivision of
•
!, the State of North Carolina
tI :�L00 P. 0. Box 218
aeastoe; N. C. 28111-0218
/' .r lid Yt''t',I,t.•rt-.k 1 i ..1 I.i.y. i , .lu e,,,.u.l, 1!41.i t , i ., .. dry. .1., ,1. .i .•., I."''id,li• •
The designation Grantor 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.
{ 1417=-SE1fi, that the Grantor, for a valuable considesaticn paid by the Grantee, the receipt
of which is hereby acknowledged, has and by these presents does grant, bargain, sell and
arrvey unto the Grantee in fee simple, all that certain lot or parcel of land situated in the
City of n/a Goose Greek Township, Unica County, North Carolina and more particularly
described as follows:
BEGINNING at a new iron pin located within a EXice Power transmission line right cf way,which
beginning port is bed to a NCGS mccx.ment"Unionville,"said begiming point being looted S.36-
2339 W.19046.20 g re d feet(19043.85 grid)from said mono nett,and running thence h u n the
beginning point,within the Duke Patter right of way,N.70-00-04 E.277.77 feet to a new iron pin;
thence N. 19-0 -25 W. 129.32 feet to an existing iron pin;the ne N.0038-23 W.165 00 feat to a
new non pin;thence S.67-55-51 W.334.77 feet a new iron pin;thence S.19-59-56 E.272.88 feet
C to the point of BEGINNING and containing 1.88 dues+/-(81,852 square feet).
,i
4.
144,
N.C. Bar Assoc. Form No. 7 0 1977
Printed by Agreement with the N.C. Bar Assoc. 1003

BK959PG815
Ttae property hereinabove described was acquired by Grantor by instrument reczuded in Book
Page .
A map showing the above described property is recorded in Plat , page
TO HAVE AND TO HDLD the aforesaid lot or parcel of land and all privileges and appurtenances
thereto belonging to the Grantee in fee simple.
And the Grantor covenants with the Grantee, that Grantor is seized of the prenises in fee
simple, has the right to cervey the same in fee simple, that title is marketable 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 hereinafter stated.
4110 Title to the property hereinabove described is subject to the following exceptions:
Subject to any easements and rights of way for roads and utilities which may border or crow
said property.
IN WITNESS WHEREOF, the Grantor has hereunto set his hand and seal, or if corporate, has
caused this instrrnant to be signed in its corporate name by its duly authorized officers
and its seal to be hereunto affixed by authority of its Board of Directors, the day and
year first above written.
.A-( 1Wt•--
(SEAL)
(Corporate Name)
Buren Clmt:, widower
BY,
(SEAL)
President
A'ITESI':
(SEAL)
(Corporate (SEAL)
Secretary rponate Seal)
• ?j uCAL-srAmP NORM CAROLINA, ttnim County.
` I, a Notary Public of the Chanty and State aforesaid, certify that Buren
Csmtz wick:wa
• r pex'sa><nlly appeared before me this day and acknowledged
t the execution of the foregoing inst t. Witness my hand and official
stamp or seal, this I U day of r i 1 , 19_7 .
My commission expires: 0u142
2099g
v (�►��C� �- 0-C _ Notary Public
S Z.-B AMP NORTH CAROLINA, County.
I, a Notary Public of the County and State aforesaid, certify that
this day an adonowled3ed that he/she is personally cane before ne
Secretary of a North
Carolina anon-profit corporation, and that by authority duly given and as the
itact of the corporation, the foregoing instrument was signed in its name by
President, sealed with its corporate seal and attested by
him/her as its Secretary. Witness my hand and official stamp or
seal, this day of , 19
My commission expires:
Notary Public
The foregoing Certificates) of (2n*4 A (Suct ua ocynion(�w`c_
is/at certified to be correct. This instrument and this certificate are duly registered at
the to and in the Book and Page shown on the first page hereof. JUDY G. PRICE
RF7GIST51c OF D® FOR PA� � ODUg Y
By11111
�R1tY/llseictant Register of Deeds,
H.C. Bar Assoc. Form No. 7 1977
Gr Lntnj ty Ayreemnnt wl.h trry H.C. Bar A.ea.a. ICO

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

Union County Floodplain Development Permit(NR 24012)

Revised 11/8/18
Town of Fairview Zoning
Classification*:
7516 Concord 1 Iighway Monroe NC 28110 k14--171D
'If Conditional Use,
Cornmerlcal Or attach recorded permit
NON-RESIDENTIAL USE ZONING PERMIT
_ 2.0/ 1 I. o-Z02-1 S500 GUg<3 -
Permit Number: Date: Fee Paid: Check Number:
Union County ff704)292-2560 I [e-mail] 1
Applicant Name: Phone#: Email:
500 N Main Street, Suite 600 Monroe i NC 28112-4730
Applicant Mailing Address: City State Zip
Property Information /
Street Address: 1629 Old Fish Road, Monroe, NC
Tax Parcel Number:08123007B Area: 1 .88 ac Street Frontage:N/A
(
Gross Floor Area: 242 sf _ Principal Use: Municipal
I
Sign Square Footage N/A _ Parking Spaces Provided: NIA
Principal Structure Requirements:
Required: Proposed
Feet Front Setback : 75 /
Feet Rear Yard Setback 80
Feet Left Side Yard 40
Feet Right Side Yard 100
Feet(Max) Bldg. Height 12.69 f Feet(Max) Lot Width @ Front Setback 277
**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)all 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;(c)any other information that may be needed to
insure that the proposed structure is in compliance with all applicable provisions of the Town of Fairview Land Use Ordinance .
I HEREBY CERTIFY that all of the information provided for this application and all attachments are true and correct to the best of my
knowledge. I further certify that I am familiar with all 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 RATE
Thomas Mann. CIP Program Manager Ji......„ A. 1-30-24 - L
THIS PERMIT IS: APPROVED DISAPPROVED
LAND USE ADMINISTRATOR DATE
CO n
- -/// '

Town of Fairview
FLOODPLAIN DEVELOPMENT PERMIT APPLICATION n
Date: (�Jlppg-- Permit Number: w/Z O
Received by: - Property P.I.N.: Qg/2,3 t2407B
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 J Map Panel Date: 10/16/2008 Map Index Date:
Flood Zone: AE,X COBRA zone: N/A
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 (@ or above BFE+Freeboard)
5. Elevation in relation 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? N/A
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: N/A (1 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 N/A (NGVD).
Applicant acknowledgment: 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 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 Program Manager Ed Humphries
Signature of Applicant& ate Si.•• . � a Admi .strator& Date
7nvr 1-29-24 AIWA
Address&Telephone Number Ad r-ss&Telephone Number
500 N Main Street,Suite 600 7516 Concord Highway
Monroe,NC 28112-4730 Monroe,NC 28110
[phone] [phone]

Town of Fairview
/ FLOODPLAIN DEVELOPMENT PERMIT APPLICATION./Q
Date: / /Zo Z� Permit Number: /�/� 210/1/
Received by: Property P.I.N.: 08/23 CO7e
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 .1 Map Panel Date: 10/16/2008 Map Index Date:
Flood Zone: AE,X COBRA zone: N/A
Regulatory Floodway Info: (Cheek 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 relation 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? N/A
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: N/A (1 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 N/A (NGVD).
Applicant acknowledgment: 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 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 Program Manager Ed Humphries
Signature of Applicant& ate Sign. .e Administrator&Date
. L 1-29-24
Address&Telephone Number Addr s&Telephone Number
500 N Main Street,Suite 600 7516 Concord Hi hwa
Monroe,NC 28112-4730 Monroe,NC 28110
[phone] [phone]

/VR 2 A 'f2-
Hazen Hazen and Sawyer
9101 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.com

Awe v/ ®(
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 4881.10 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,
Michael Parker, PE
Senior Associate
Cc: Fred Braun (Union County Water)
l'tg 2 or2
hazenandsawyer.com

Union County Site Plan Review

Union County Government
UNION 500 N.Main Street
COUNTY Suite47
north caroling Monroe, NC 28112
704-283-3816
March 14, 2024 Project Number 20232870
Location 1629 Old Fish Rd, Monroe, NC 2
Zachary Kemak
Hazen &Sawyer Stage Commercial Site Plan
9101 Southern Pine Blvd
Charlotte, NC 28273
Parcel(s) 08123007B
Status Conditional
Dear:Zachary Kemak
**** NOTICE****
Please send any correspondence to [e-mail] or the individual plan reviewer. Replying to the clerk
who sent this email will not get a response.
We have completed our review of the plan identified above.The plan was approved per attached comments, if any that must
be addressed.This letter is not to be construed as a zoning compliance, grading, or building permit, certificate of occupancy,
or a substitute for any permit or certificate required by any state or federal government entity.
***** IF APPLICABLE***** For approved commercial site plans, once the owner/developer has received NPDES approval (if
applicable)for the project(this is issued by NCDEQ and can take up to 14 days from the date the project is approved by
Union County),you may contact the Environmental Compliance Office(Environmental Health)at(704)283-3553 to schedule
the pre-construction meeting. This meeting will occur on-site with county staff members,the financially responsible person,
site engineer, and the contractor(who must be licensed in North Carolina through the NC Labor Licensing Board).Your
preliminary grading permit and zoning compliance will be issued at the pre-construction meeting. Once this meeting has
occurred, building permits can be applied for.
3/14/2024 Page 1 of 2

Plan Review Comments
Fire Marshal -Jon Williams - Approved
[e-mail]
Review Comments:
Public Works - Matthew Murray - Approved
[e-mail]
Review Comments:
CIP Project
Commercial BPM -Terry Griffin - Approved
[e-mail]
Review Comments:
Commercial Electrical Review -Steven Stack - Not Applicable
[e-mail]
Review Comments:
Environmental Health Land Use - Ramona Dunphy - Conditional
[e-mail]
Review Comments:
Existing PW Well to be properly abandoned. See attached application
3/14/2024 Page 2 of 2