SW3240203_Design Calculations_20240222

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c Project Narrative & Pertinent
` `� Calculations 1/31/24
Union County Shrine Club
Project Name: Union County Shrine Club
DEQ Permit ID UNION-2024-013
Project Address: NC Highway 601, Union County, NC
Lat/ Long at Project Entrance: 34.8258° N, 80.4227°W
Land Owner: Union Shrine Properties, Inc.
Mailing Address: 124 Brightland Run, Monroe, NC 28112
Owner Contact: Mr. William Cox
Owner Contact Email: [e-mail]
Owner Contact Phone: [phone]
Plan Preparer: Jesse W. Wilson, P.E.
Address: 1001 Chestnut Drive, Smithfield, NC27577
Phone: [phone] Email: [e-mail]
Project Description:
The purpose of the land disturbing activity is to construct a 5,500 square-foot single story Shriners
Meeting Facility with associated parking and utilities.The Grading& Erosion Control Plan was Originally
Submitted by Wolftrail Engineering in September, 2023. Wilson Engineering Group has since been
hired to address the necessary revisions requested in the review.The review fee for the Erosion Control
Permit Application was originally$200.00 with the disturbed limits listed at 1.18 Acres. An additional
review fee of$200.00 was necessary in the revised submittal for the increase in disturbed construction
limits to 3.18 Acres.
Existing Site Conditions:The proposed construction area is relatively flat with slopes ranging from 2 to
6%. No pre-2006 impervious conditions exist with the exception of an existing 12'wide gravel road
running east to west along the northern property boundary.
Stormwater Runoff: Temporary Sediment Basins 1 &2 will control offsite siltation. The increase in
impervious area(1.04 Acres)will increase the peak runoff during the 10-year storm from 17.12 cfs to
22.01 cfs.
Adjacent Areas:
The areas adjoining the site are farms and farmer residences.
Off-site Land-Disturbing Areas:
There will be no off-site Land-disturbing Activities or Areas associated with this construction.
Soils-See Appendix A
Soil Types:
TbB2—100%of Area of Interest (AOI);
Critical Areas:
There are no critical areas on the site in terms of stream and wetland buffers.
Erosion &Sediment Control Measures—See Appendices B & C:
The Erosion and Sediment Control Measures slated for construction, as well as the Construction
Sequence are shown on Sheets 1 of the Grading & Erosion Control Plan Set,with construction details
and maintenance schedules shown on Sheet 2.

Zdose Project Narrative & Pertinent
Calculations 1/31/24
Union County Shrine Club
Permanent Stabilization:
The majority of the disturbed area for the project will be stabilized by concrete (building area, access
roads, parking areas& sidewalks).The remaining disturbed areas will be permanently stabilized by
vegetation (grass) as follows:
Seeding Specification & Rate-Tall Fescue (Ky 31), 80- 100 lbs per acre
Fertilizer Rate- 1000 lbs per acre 10-20-10 PKN
Liming Rate- 1 tons per acre pulverized agricultural grade limestone
Mulching Type/ Rate-Straw/4,000 lbs per acre.
Property Area:
Total property: 6.32 Acres
Impervious Areas—See Appendix D:
The property area is 6.32 acres.The site has a pre-2006 existing gravel road bordering the north
property line.A portion of this gravel road will be paved for the newly proposed entrance.
Impervious Area Summary—
Total Property Area (6.32 Ac.)
Total pre-2006 Impervious Area: 0.15-acres
Total Remaining Pervious Area 6.17 Acres
24% High Density Threshold—1.48Acres
Total Post 2023 Construction Impervious Area: <1.04-acres
APPENDICES
A. Soils Map
B. Sediment Basin Calculations
C. Impervious Area Summary Spreadsheet
D. Ditchline Calculations for Erosive Velocity

APPENDIX A
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Soil Map—Union County,North Carolina
APPENDIX A
SOILS MAP
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
TbB2 Tarrus gravelly silty clay loam, 6.7 100.0%
2 to 8 percent slopes,
moderately eroded
Totals for Area of Interest 6.7 100.0%
USDA Natural Resources Web Soil Survey 11/27/2023
Conservation Service National Cooperative Soil Survey Page 3 of 3

APPENDIX B
Temporary Sediment Basin Sizes - Preliminary Rectangular Sizing
Shrine Club, Union County, NC
10-Year Intensity = 7.74
Heq-a
Sed. Req'd Req'd Iterative Design Sed. Slop
Skim. Drain. Dist. Storage Req'd. Top Top Top S/A S/A Top Resulting Stor. e
? (Y Area Area Q10 Volume Surface SAW SAL Design Length Surface Depth (ft/ Base Base Volume Weir
TST or N) (Ac) (ac) C (cfs) (CF) Area (sf) (ft) (ft) Width (ft) (ft) Area (sf) (ft) 1 ft) W(ft) L (ft) (cf) Length
SB-1 Y 1.20 1.13 0.60 5.57 2,034.0 1,950.5 31.2 62.5 27.0 55.0 1,485.0 2.0 2 19.0 47.0 2,353.0
SB-2 Y 1.05 0.93 0.60 4.88 1,674.0 1,706.7 29.2 58.4 26.0 50.0 1,300.0 2.0 2 18.0 42.0 2,031.6
Actual Volume:V-1/3h (G1 + ((G1xG2))^0.5) + G2) Where: G1 = base area, G2 = top area, h = depth
Required Volume = 3600 x Dist. Area (ac.)w/out Skimmer. 1,800 x Dist. Area w/Skimmer.
Required Surface Area = DA* 350 (w/skimmer) or DA* (450 w/out skimmer)
Base Length = 2 x Base Width
Drain Area Weir Lengths L=1,685'
(Acres) (Ft) H=40'
1 4 Tc=10 Min.
2 6 110=5.48
3 8
1/23/2024

Temporary Sediment Basin Sizes - Design (CAD Calcs)
Shrine Club, Union County, NC
EROSION CONTROL - Revised 12/13/2023
Req'd Re 'd Re 'd To of Dia Dia. Dia.
Sediment Req'd. Top Top Surface Surface Base Base Berm Design Skimmer (In.) (In.) (In.)
TST Storage Surface Elevation Area Elevatio Area Volume Head Orifice Orifice Orifice
SAW SA L Elevation Size
Volume Area (sf) (ft) (ft) MSL sq.ft. n MSL sq. ft. MSL CF Size 1- Size 2- Size 3-
(CF) day days days
SB-1 2,034.0 1,950.5 31.2 62.5 600.5 2574.0 598.5 1261.5 602.0 3835.5 1.5 1.5 2.2 1.6 1.3
SB-2 1,674.0 1,706.7 29.2 58.4 601.0 3422.0 599.0 831.7 602.5 4253.7 1.5 1.5 2.3 1.6 1.3
Skimmer Head
Size (in.) (in.)
1.50 1.5
2.00 2.0
3.00 3.0
4.00 3.3
5.00 4.0
6.00 5.0
8.00 6.0
12/13/2023

1/31/24 APPENDIX C
Union County Shrine Club
PCSM Application- Impervious Calculations
FOR POST CONSTRUCTION
STORMWATER MGMT APP
Description SF ACRES
Total Property Area 275,321.65 6.32
Existing Impervious to remain (Gravel 3,505.86 0.08
PROPOSED IMPERVIOUS
Onsite Buildings 5,500.00 0.13
Onsite Streets 0.00 0.00
Onsite Sidewalks 1,795.21 0.04
Onsite Parking-Gravel, Pavement,
Access Drives 37,980.87 0.87
Other Onsite
Future 0.00
Offsite 0.00
Total PROPOSED+ EXISTING
Impervious Area 48,781.94 1.12
Total Proposed Impervious
Percentage (using 15A NCAC 02H
.1003(1a) 17.72%
Total Proposed Impervious
Percentage (using 15A NCAC 02H ,0.,, ,CAR,,,•
.1003(1b) 16.66% ,,,,.,OQL �......ti / ••,•••
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2/12/2024

1/31/2024 APPENDIX D
UNION COUNTY SHRINE CLUB
DITCH LINE CALCULATION
Impervious Composite DITCH
Description Drain. Area DA Area Grass Area Coefficient Q10 PEAK SLOPE VELOCITY STABLE
(SF) (acres) (sf) (sf) Cc 110 (in/hr) (cfs) (ft./ft.) (fps) LINING (YES/NO)
Ditch 1 6,527 0.15 2,189 4,338 0.72 7.74 0.83 0.0263 1.39 Sod Former YES
Ditch 2 15,316 0.35 4,207 11,109 0.70 7.74 1.89 0.0122 1.18 Sod Former YES
Ditch 3 27,310 0.63 13,740 13,570 0.78 7.74 3.77 0.0100 1.34 Sod Former YES
Ditch 4 7,801 0.18 1,383 6,418 0.66 7.74 0.92 0.0107 0.85 Sod Former YES
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1/31/2024

1/31/24,3:37 PM ECMDS 7.0
NORTH North American Green
AMERICAN 5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Ditch 1
Name Ditch 1
Discharge 0.83
Channel Slope 0.0263
Channel Bottom Width 0
Left Side Slope 2
Right Side Slope 2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Very Good 80-95%
Soil Type Clay Loam(CL)
Unreinforced Vegetation
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress Factor Pattern
Underlying Straight 0.83 cfs 1.39 ft/s 0.55 ft 0.068 4 lbs/ft2 0.4 lbs/ft2 10 STABLE
Substrate
Unreinforced Straight 0.83 cfs 1.39 ft/s 0.55 ft 0.068 4 Ibs/ft2 0.89 Ibs/ft2 4.47 STABLE
Vegetation
https://ecmds.com/project/159457/channel-analysis/258898/show 1/1

1/31/24,3:40 PM ECMDS 7.0
NORTH North American Green
AMERICAN 5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Ditch 2
Name Ditch 2
Discharge 1.89
Channel Slope 0.0122
Channel Bottom Width 0
Left Side Slope 2
Right Side Slope 2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Very Good 80-95%
Soil Type Clay Loam(CL)
Unreinforced Vegetation
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress Factor Pattern
Unreinforced Straight 1.89 cfs 1.18 ft/s 0.89 ft 0.075 4 lbs/ft2 0.68 lbs/ft2 5.88 STABLE
Vegetation
Underlying Straight 1.89 cfs 1.18 ft/s 0.89 ft 0.075 4 Ibs/ft2 0.3 lbs/ft2 13.14 STABLE
Substrate
https://ecmds.com/project/159457/channel-analysis/258898/show 1/1

1/31/24,3:41 PM ECMDS 7.0
NORTH North American Green
AMERICAN 5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Ditch 3
Name Ditch 3
Discharge 3.77
Channel Slope 0.01
Channel Bottom Width 0
Left Side Slope 2
Right Side Slope 2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Very Good 80-95%
Soil Type Clay Loam(CL)
Unreinforced Vegetation
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress Factor Pattern
Unreinforced Straight 3.77 cfs 1.34 ft/s 1.19 ft 0.073 4 lbs/ft2 0.74 lbs/ft2 5.4 STABLE
Vegetation
Underlying Straight 3.77 cfs 1.34 ft/s 1.19 ft 0.073 4 Ibs/ft2 0.33 Ibs/ft2 12.07 STABLE
Substrate
https://ecmds.com/project/159457/channel-analysis/258898/show 1/1

1/31/24,3:42 PM ECMDS 7.0
NORTH North American Green
AMERICAN 5401 St. Wendel-Cynthiana Rd.
Poseyville, Indiana 47633
GREEN Tel. [phone]
>Fax [phone]
www.nagreen.com
ECMDS v7.0
CHANNEL ANALYSIS
>>>Ditch 4
Name Ditch 4
Discharge 0.92
Channel Slope 0.0107
Channel Bottom Width 0
Left Side Slope 2
Right Side Slope 2
Low Flow Liner
Retardence Class C 6-12 in
Vegetation Type Sod Former
Vegetation Density Very Good 80-95%
Soil Type Clay Loam(CL)
Unreinforced Vegetation
Normal Permissible Calculated Safety Staple
Phase Reach Discharge Velocity Mannings N Remarks
Depth Shear Stress Shear Stress Factor Pattern
Underlying Straight 0.92 cfs 0.85 ft/s 0.73 ft 0.086 4 lbs/ft2 0.22 Ibs/ft2 18.25 STABLE
Substrate
Unreinforced Straight 0.92 cfs 0.85 ft/s 0.73 ft 0.086 4 Ibs/ft2 0.49 Ibs/ft2 8.16 STABLE
Vegetation
https://ecmds.com/project/159457/channel-analysis/258899/show 1/1