SWA000056_Union County Sherriffs Stormwater Report_9/6/2019

TABLE OF CONTENTS

INTRODUCTION ......................................................................................................................2
PROPOSED DEVELOPMENT ...............................................................................................2
STORMWATER REQUIREMENTS ....................................................................................2
PRE-DEVELOPMENT CONDITIONS ................................................................................2
POST-DEVELOPMENT CONDITIONS .............................................................................3
EROSION AND SEDIMENT CONTROL ...........................................................................3
CONCLUSIONS .........................................................................................................................4
APPENDIX A: BACKGROUND INFORMATION
APPENDIX B: PRE- & POST-DEVELOPMENT DRAINAGE AREA MAPS
APPENDIX C: STORM DRAINAGE PIPING AND CALCULATIONS
APPENDIX D: EROSION & SEDIMENTATION CONTROL
CALCULATIONS

INTRODUCTION
This report outlines the approach and results of a stormwater impact analysis
conducted for the proposed Union County Sheriff’s Office Firing Range Project. The
project site is located at Mills Harris Road in Marshville, North Carolina and is within
the Yadkin Pee- Dee River Basin. The entire parcel site is approximately 161.03
acres and consists primarily of farmland with multiple, smaller areas of woods.
Stormwater management analysis and design for the proposed development will
be performed in accordance to the North Carolina Department of Environment
Quality (NCDEQ) Stormwater BMP Manual emphasizing low density development.
PROPOSED DEVELOPMENT
The proposed Union County Sheriff’s Office Firing Range Project currently
consists of a new firing range building with an approximate building footprint of
27,227 square feet as well as a gravel access drive, gravel parking areas, concrete
sidewalks, concrete entrance, concrete driveway, storm drainage structures and
piping. New work will consist of the construction o f a new Shoot
House, a new training pavilion, and a new modular c lassroom
buildings. No building demolition for this project is required.
STORMWATER REQUIREMENTS
The stormwater guidelines for the project site will follow the NCDENR Stormwater
BMP Manual for low density development. When completed, the total percentage
impervious area for this site, 1.78%, falls below the 24 percent threshold for built-
upon area. The table below outlines the impervious site area for Stormwater Quality
requirements.

Drainage Basin Information
Total Site Area 7,014,467 SF
Total Project Disturbed Area 335,317 SF
Proposed Impervious Area (Built Upon Area) 125,265 SF
Percent Impervious Area 1.78 %

PRE-DEVELOPMENT CONDITIONS
The total disturbed site area is approximately 7.70 acres. The pre-development area
was analyzed and the area was accessed to develop the Rational Runoff Coefficient
values. The existing site currently drains to Jack’s Branch stream located in the North-
East portion of the site. The project area is rated as a minimal flood hazard area
categorized as Zone X per FEMA. The hydrologic soil group for the project consists

mostly of Group C & D soils determined using the NRCS Web soil survey. See
Appendix A for more detailed information for the both the Soil and Flood Zone
mapping. The following table summarizes the pre-development drainage conditions
associated with the project area. See Appendix B for the Pre-Development Drainage
Map.

Pre-Development Area Breakdown Area (Acre)
Total Area 16.06
Impervious Area 0.03
Pervious Area 22.85

POST-DEVELOPMENT CONDITIONS
The stormwater management plan will treat the project area through the use of
low density/low impact methods. Stormwater runoff will travel by overland flow to low
points and in most locations will be collected by grass swales with side slopes 3:1 or
flatter to encourage infiltration. The excess runoff will be collected in the storm
drainage pipe network and conveyed to the outlet point of the site. The site
stormwater management plan implements and utilizes minimal piping as necessary
to handle all runoff. The following table summarizes the post-development
drainage conditions associated with the drainage area. See Appendix B for the Post-
Development Drainage Map.

Post-Development Area Breakdown Area (Acre)
Total Area 22.88
Impervious Area 2.88
Pervious Area 20.00

The permanent storm drainage piping system is designed for the 10-year storm
event using the Rational Method for rainfall analysis. Rainfall intensity values were
taken from the NOAA website and can be found in Appendix A.

EROSION AND SEDIMENT CONTROL
Erosion control calculations for the Union County Sheriff’s Office Firing Range
Project are included in Appendix D. The total land disturbance for this phase of the
project is approximately 1.94 Acres. The calculations included are based on the
standards and specifications of the North Carolina Erosion and Sediment Control
Planning and Design Manual.
The scope of this project consists of preparing a gravel road and pad to accommodate
the proposed building sites. There are minimal hard surfaces such as sidewalks,
parking areas, and driveway entrances. Appendix D includes calculations for the
sizing of the erosion control measures described below.
Erosion control measures for the project site will include a construction entrance at
the entry and exit point of the site off of the main driveway into the site. Silt fencing
is to be installed around areas of the site as necessary to prevent loss of sediment.
Grass swales, storm drainage piping and inlet structures will be installed to convey and
direct all future runoff.

During construction all the new inlet structures will be protected by inlet
protection measures.
At the site discharge point where all stormwater runoff is conveyed, a temporary
sediment trap is already installed as part of Phase 1. The sediment trap is a
temporary measure to be used during the construction phase and will be removed
once the ground has been permanently stabilized. Temporary seeding will be used
as applicable to provide ground cover and stabilize disturbed areas during the
construction phase.

CONCLUSIONS
The proposed project will appropriately utilize the NCDENR Low Density
Development stormwater standards to address water quality. The peak flow from
the 10-year storm event will be diffused in a non-erosive manner with vegetated
swales where possible with side slopes of 3:1 or flatter. Minimal storm drainage
piping was used as necessary and was sized to adequately convey the 10-year 24-hour
storm event.

Appendix A
BACKGROUND INFORMATION

Hydrologic Soil Group—Union County, North Carolina
(Union County Sheriff's Firing Range)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/17/2015
Page 1 of 438746003874800387500038752003875400387560038758003876000387460038748003875000387520038754003875600387580038760003876200552900553100553300553500553700553900554100
552900 553100 553300 553500 553700 553900 554100
35° 1' 37'' N 80° 25' 14'' W35° 1' 37'' N80° 24' 24'' W35° 0' 42'' N
80° 25' 14'' W35° 0' 42'' N
80° 24' 24'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 350 700 1400 2100
Feet
0 100 200 400 600
Meters
Map Scale: 1:8,190 if printed on A portrait (8.5" x 11") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at 1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil line
placement. The maps do not show the small areas of contrasting
soils that could have been shown at a more detailed scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more accurate
calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as of
the version date(s) listed below.
Soil Survey Area: Union County, North Carolina
Survey Area Data: Version 15, Sep 10, 2014
Soil map units are labeled (as space allows) for map scales 1:50,000
or larger.
Date(s) aerial images were photographed: Feb 11, 2011—Feb
13, 2011
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor shifting
of map unit boundaries may be evident.
Hydrologic Soil Group—Union County, North Carolina
(Union County Sheriff's Firing Range)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/17/2015
Page 2 of 4
Hydrologic Soil Group
Hydrologic Soil Group— Summary by Map Unit — Union County, North Carolina (NC179)
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
BaB Badin channery silt loam,
2 to 8 percent slopes
C 24.1 15.0%
BdB2 Badin channery silty clay
loam, 2 to 8 percent
slopes, moderately
eroded
C 19.0 11.8%
CmB Cid channery silt loam, 1
to 5 percent slopes
D 50.4 31.4%
GoC Goldston very channery
silt loam, 4 to 15
percent slopes
D 23.0 14.3%
GsB Goldston-Badin
complex, 2 to 8
percent slopes
D 16.9 10.5%
GsC Goldston-Badin
complex, 8 to 15
percent slopes
D 13.7 8.5%
MhA Misenheimer-Cid
complex, 0 to 3
percent slopes
C/D 5.7 3.5%
TaB Tarrus gravelly silt loam,
2 to 8 percent slopes
B 7.7 4.8%
Totals for Area of Interest 160.5 100.0%
Hydrologic Soil Group—Union County, North Carolina Union County Sheriff's Firing Range
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/17/2015
Page 3 of 4
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Union County, North Carolina Union County Sheriff's Firing Range
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4/17/2015
Page 4 of 4

Appendix B
PRE-DEVELOPMENT DRAINAGE AREA
MAP POST DEVELOPMENT DRAINAGE
AREAS MAP

GRAPHIC SCALE(S)DRAINAGE AREA 2:15.90 ACDRAINAGE AREA 1:0.16 ACCONCENTRATED FLOW:L=365 FTS=5.2%CHANNEL FLOW 1:L=769 FTS=1.4%OVERLAND FLOW:L=100 FTS=2.0%DRAINAGE AREA 3:6.82 AC
GRAPHIC SCALE(S)DRAINAGE AREA 2:10.67 ACDRAINAGE AREA 1:0.16 ACDRAINAGE AREA 3:0.73 ACDRAINAGE AREA 5:0.83 ACDRAINAGE AREA 7:0.51 ACDRAINAGE AREA 8:0.13 ACDRAINAGE AREA 13:0.10 ACDRAINAGE AREA 4:1.55 ACDRAINAGE AREA 9:0.03 ACDRAINAGE AREA 14:0.23 ACDRAINAGE AREA 11:0.23 ACDRAINAGE AREA 12:0.28 ACDRAINAGE AREA 10:0.02 ACDRAINAGE AREA 6:0.59 ACDRAINAGE AREA 15:6.82 AC

Appendix C
STORM DRAINAGE PIPING AND CALCULATIONS

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 16 2018
Storm Pipe (Str. 2 to Ex. Str. CB3)
Circular
Diameter (ft) = 1.25
Invert Elev (ft) = 533.64
Slope (%) = 1.66
N-Value = 0.013
Calculations
Compute by: Known Q
Known Q (cfs) = 4.95
Highlighted
Depth (ft) = 0.70
Q (cfs) = 4.950
Area (sqft) = 0.71
Velocity (ft/s) = 6.97
Wetted Perim (ft) = 2.12
Crit Depth, Yc (ft) = 0.91
Top Width (ft) = 1.24
EGL (ft) = 1.46
0 1 2 3
Elev (ft)Section
533.00
533.50
534.00
534.50
535.00
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.Wednesday, May 16 2018
Storm Pipe (Str. 4 to Str. 3)
Circular
Diameter (ft) = 1.00
Invert Elev (ft) = 534.96
Slope (%) = 0.80
N-Value = 0.013
Calculations
Compute by: Known Q
Known Q (cfs) = 2.54
Highlighted
Depth (ft) = 0.68
Q (cfs) = 2.540
Area (sqft) = 0.57
Velocity (ft/s) = 4.46
Wetted Perim (ft) = 1.94
Crit Depth, Yc (ft) = 0.69
Top Width (ft) = 0.93
EGL (ft) = 0.99
0 1 2 3
Elev (ft)Depth (ft)Section
534.00 -0.96
534.50 -0.46
535.00 0.04
535.50 0.54
536.00 1.04
Reach (ft)

Appendix D
EROSION & SEDIMENTATION CONTROL CALCULATIONS

LIMITS OFDISTURBANCE = 3.59 AC.LIMITS OFDISTURBANCE = 3.59 AC.LIMITS OFDISTURBANCE = 2.00 AC.EXISTING INDOOR RANGEASSEMBLYSHELTERMODULARCLASSROMMODULARCLASSROM(STORAGEONLY)MODULARCLASSROMSHOOTHOUSEMODULARCLASSROM(STORAGEONLY)XX
X
XX
X
XXRESTROOMSKITCHEN AREAX 20'x24' K-9REHABILITATIONSHELTERWWDCB 11RIM=535.46OUT=533.12CB 2RIM=538.86IN=532.81(CB 1)IN=532.77(CB 11)OUT=532.76CB 3RIM=537.98IN=532.13(CB 12)IN=532.05(CB 2)OUT=532.05(CB 4)CB 4RIM=539.26IN=531.32(CB 3)IN=536.89(6" PVC)OUT=531.31(FES)FESINV=530.33EBXXX
FFE=542.75CO W/2'x2' CONC PADCO W/2'x2' CONC PADCB 1RIM=537.70OUT=534.51CO W/2'x2' CONC PAD1'x1.7' HHUTILVAULT1'x1.7' HHUTILVAULTCONCPADGRASSCO W/2'x2' CONC PADSTORM MHRIM=542.22INV=530.48(FULL OF WATER)FFE=542.78CO W/2'x2' CONC PAD UNABLE TO LOCATEEND OF PIPE X XCONCPADFENCEFENCEGPS 1N: 466,509.80E: 1,576,609.51ELEV.: 546.09'GPS 2N: 466,528.21E: 1,576,040.94ELEV.: 541.23'N: 466,202.30E: 1,576,392.39ELEV.: 542.04'N: 466,243.30E: 1,576,102.32ELEV.: 551.78'CONCPADXXXXX
X
24" RCP24" RCP18" RCP15"
R
C
P 15" RCP~12" RCP6" PVCWELL TANKWELLCONC WALK1'x1.7' HHTELEVAULTCONC WALKDITCHDITCH
DITCHXXXXXXXXXX
XXXXXXXXXX
EXISTING 'ROTUNDILOBA'SWEETGUM TREES(PER PHASE 1 PLANS)EXISTING INDOOR RANGE4'
'

S
ANASPHALTASPHALTASPHALTASPHALTEDGE OFPAVEMENTEDGE OFPAVEMENTEDGE OFPAVEMENTZONE
X
ZONE
A
E100 YEAR FEMA FLOOD LINE(TAKEN FROM PROPERTYSURVEY DATED 12/2/14)CENTERLINE OFJACKS BRANCHEXISTING FIRE LANESIGNS54
0
545 55053853954
1
5
4
2
5
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3
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4
4
546547548549 55154
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545 550
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5435445
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545 543550548549551552550 549
536537FFE=538.13'FFE=543.35'FFE=548.80'FFE=548.65'FFE=548.45'FFE=548.25'542
543544GRADE SIDEWALK AT2% MAX CROSS-SLOPE,MATCHING EX. EDGEOF PAVEMENT GRADE156.57' FROM100-YEAR FEMAFLOODPLAINEND SECTION (STR. 3)INV. 534.63END SECTION (STR. 4)INV. 534.96END SECTION (STR. 2)INV. 533.64CATCH BASIN (EX. STR. CB3)INV. 532.15546.60'544.70'547.27'547.67'550.78'550.37'535.80'536.20'537.89'538.31'537.85'537.85'537.85'537.85'537.85'537.85'537.45'537.85'536.96'536.91'536.67'537.00'537.08'541.51'541.10'542.24'543.15'542.40'543.22'543.22'543.40'543.73'542.48'542.48'538.00'540.50'538.03'536.41'535.78'537.74'537.20'536.56'537.54'542.48'542.54'542.85'542.69'542.69'542.98'543.95'544.05'544.06'545.55'545.57'545.31'545.01'545.48'545.30'41.78' OF 12"HDPE @ 0.80%90.06' OF 15"HDPE @ 1.66%62.21' FROM 100-YEARFEMA FLOODPLAIN108.5' FROM STREAM CENTERLINEADAACCESSIBLEROUTEADAACCESSIBLEROUTEINSET 'B'INSET 'A'X
X
X
5
4
5 54354454
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540541542543
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543544542.23'542.28'542.19'542.24'541.52'541.47'541.48'541.46'541.45'541.40'540.38'540.38'540.38'540.31'541.88'541.88'XXXXXXX544545542543544545543FFE=548.45'545.00'545.13'545.07'545.08'545.30'543.61'543.56'543.57'543.55'543.51'543.46'542.12'542.14'542.17'542.18'542.34'542.34'544.84'544.84'541.62'541.64'541.16'541.34'541.36'541.42'541.50'541.44'610 East Morehead St, Suite 250CHARLOTTE, NC 28202TEL [phone]FAX [phone]www.timmons.comYOUR VISION ACHIEVED THROUGH OURS.VIRGINIA NORTH CAROLINASite Development Residential Infrastructure TechnologyTHIS DRAWING PREPARED AT THECHARLOTTE OFFICE40685NORTH CAROLINA LICENSE NO. C-1652PRE-FINAL SUBMITTALAE DESIGN TRAINING AREASHELTERUnion County Sheriff's Office5/15/2018MILLS HARRIS ROADMARSHVILLE, NC12345ABCDSHEETOF16DESIGN: J. ZILKEDRAWN: J. ZILKEREVIEW: B. CRUTCHFIELDSHEETKEY PLANSUBMITTALSEALSCONSULTANTDESIGNERCNREVISIONS213 South Jefferson, Suite 1011Roanoke, VA 24011540.982.0800Clark Nexsen License Number: C-102873951 4/22/19 COUNTY COMMENTS2 5/08/19 COUNTY COMMENTS0SCALE 1"=30'60'30'NAD 83
CG100GRADING ANDDRAINAGE PLANINSET 'A'INSET 'B'GRADING AND DRAINAGE NOTES:1.PROVIDE POSITIVE DRAINAGE AWAY FROM BUILDING FOUNDATION AT ALLTIMES.2.NO EXCAVATION IN THE AREAS OF EXISTING UTILITIES IS PERMITTED UNLESSTHEIR LOCATION HAS BEEN DETERMINED. CALL "MISS UTILITY" AT1-800-632-4949, THREE WORKING DAYS PRIOR TO WORK.3.CONTRACTOR IS RESPONSIBLE FOR DISPOSING OF EXCESS SOIL OR MATERIALSAT AN APPROVED LOCATION IN ACCORDANCE WITH LOCAL, STATE, ANDFEDERAL REQUIREMENTS.4.REFER TO GEOTECHNICAL REPORT AND RECOMMENDATIONS FROM 3RD PARTYTESTING COMPANY FOR SOIL PREPARATION AND TESTING REQUIREMENTS.5.EXISTING BENCHMARKS SHALL REMAIN UNDISTURBED UNLESS PRIORAPPROVAL IS GRANTED IN WRITING BY TIMMONS GROUP.6.CONTRACTOR IS RESPONSIBLE FOR REMOVING AND DISPOSING OF ALLCONSTRUCTION DEBRIS FROM SITE IN ACCORDANCE WITH ALL STATE ANDLOCAL REGULATIONS. NO CONSTRUCTION DEBRIS IS PERMITTED TO BE STOREDAND.OR BURIED ON SITE.7.IN ACCORDANCE WITH HANDICAP ACCESSIBILITY REQUIREMENTS, THECONTRACTOR SHALL COMPLY WITH THE "2010 EDITION ADA-AG CODES ANDREQUIREMENTS FOR ACCESSIBILITY FOR DISABLED PERSONS" FOR ALL ROUTESDENOTED AS "ADA ACCESSIBLE".8.GRADE AROUND ASSEMBLY SHELTER SLAB SHALL BE 4" BELOW SLABELEVATION TO ACCOMMODATE OUTLET DRAINS FROM TRENCH DRAINS IN SLAB(REFER TO ARCHITECTURAL PLANS).PROPOSED GRADELEGEND665.00'PROPOSED FINISHED FLOOR ELEV.FFE = 665.00'ADA ACCESSIBLE ROUTE9MATCHLINE SHEET CG101
LIMITS OFDISTURBANCE = 3.59 AC.LIMITS OFDISTURBANCE = 3.59 AC.LIMITS OFDISTURBANCE = 2.00 AC.EXISTING INDOOR RANGEASSEMBLYSHELTERMODULARCLASSROMMODULARCLASSROM(STORAGEONLY)MODULARCLASSROMSHOOTHOUSEMODULARCLASSROM(STORAGEONLY)XX
X
XX
X
XXRESTROOMSKITCHEN AREAX 20'x24' K-9REHABILITATIONSHELTERWWDCB 11RIM=535.46OUT=533.12CB 2RIM=538.86IN=532.81(CB 1)IN=532.77(CB 11)OUT=532.76CB 3RIM=537.98IN=532.13(CB 12)IN=532.05(CB 2)OUT=532.05(CB 4)CB 4RIM=539.26IN=531.32(CB 3)IN=536.89(6" PVC)OUT=531.31(FES)FESINV=530.33EBXXX
FFE=542.75CO W/2'x2' CONC PADCO W/2'x2' CONC PADCB 1RIM=537.70OUT=534.51CO W/2'x2' CONC PAD1'x1.7' HHUTILVAULT1'x1.7' HHUTILVAULTCONCPADGRASSCO W/2'x2' CONC PADSTORM MHRIM=542.22INV=530.48(FULL OF WATER)FFE=542.78CO W/2'x2' CONC PAD UNABLE TO LOCATEEND OF PIPE X XCONCPADFENCEFENCEGPS 1N: 466,509.80E: 1,576,609.51ELEV.: 546.09'GPS 2N: 466,528.21E: 1,576,040.94ELEV.: 541.23'N: 466,202.30E: 1,576,392.39ELEV.: 542.04'N: 466,243.30E: 1,576,102.32ELEV.: 551.78'CONCPADXXXXX
X
24" RCP24" RCP18" RCP15"
R
C
P 15" RCP~12" RCP6" PVCWELL TANKWELLCONC WALK1'x1.7' HHTELEVAULTCONC WALKDITCHDITCH
DITCHXXXXXXXXXX
XXXXXXXXXX
EXISTING 'ROTUNDILOBA'SWEETGUM TREES(PER PHASE 1 PLANS)EXISTING INDOOR RANGE4'
'

S
ANASPHALTASPHALTASPHALTASPHALTEDGE OFPAVEMENTEDGE OFPAVEMENTEDGE OFPAVEMENTDITCHZONE
X
ZONE
A
E100 YEAR FEMA FLOOD LINE(TAKEN FROM PROPERTYSURVEY DATED 12/2/14)CENTERLINE OFJACKS BRANCHEXISTING FIRE LANESIGNS54
0
545 55053853954
1
54
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543544SKIMMER SEDIMENT BASIN (TO BE RESTORED TO THEULTIMATE DESIGNED CONDITIONS PER THE PHASE ICONSTRUCTION DOCUMENTS / PERMIT PLANS)STORAGE REQUIRED: 2,358 CFSTORAGE PROVIDED: 16,006 CFSURFACE AREA REQUIRED: 5,987 SFSURFACE AREA PROVIDED: 6,472 SFBASIN BOTTOM: 526.00'STIPSFOCEIPIPIPIPSFSFSFSFSFSFOSFOSFO0.700.50 ac 40.651.05 ac 2610 East Morehead St, Suite 250CHARLOTTE, NC 28202TEL [phone]FAX [phone]www.timmons.comYOUR VISION ACHIEVED THROUGH OURS.VIRGINIA NORTH CAROLINASite Development Residential Infrastructure TechnologyTHIS DRAWING PREPARED AT THECHARLOTTE OFFICE40685NORTH CAROLINA LICENSE NO. C-1652PRE-FINAL SUBMITTALAE DESIGN TRAINING AREASHELTERUnion County Sheriff's Office5/15/2018MILLS HARRIS ROADMARSHVILLE, NC12345ABCDSHEETOF16DESIGN: J. ZILKEDRAWN: J. ZILKEREVIEW: B. CRUTCHFIELDSHEETKEY PLANSUBMITTALSEALSCONSULTANTDESIGNERCNREVISIONS213 South Jefferson, Suite 1011Roanoke, VA 24011540.982.0800Clark Nexsen License Number: C-102873951 4/22/19 COUNTY COMMENTS2 5/08/19 COUNTY COMMENTS0SCALE 1"=30'60'30'NAD 83
CG200EROSION CONTROLPLANSILT FENCESAFETY FENCESILT FENCE OUTLETOUTLET PROTECTION / RIPRAPSEDIMENT TRAPCONSTRUCTION ENTRANCEEROSION AND SEDIMENT CONTROL LEGEND:SFOPSFOSTCESAFSAF11MATCHLINE SHEET CG201EROSION CONTROL NOTES:1.ENFORCEMENT NOTE 1. FAILURE TO FOLLOW THIS CONSTRUCTION SEQUENCE MAY RESULT IN LOCALENFORCEMENT ACTIONS, INCLUDING BUT NOT LIMITED TO CIVIL PENALTIES TO 15000 PER VIOLATION PER DAY,INJUNCTIVE RELIEF, CRIMINAL PENALTIES, AND PERMIT REVOCATION. ADDITIONALLY, OFF-SITE SEDIMENTATIONMAY RESULT IN RESTORATION REQUIREMENTS.2.ENFORCEMENT NOTE 2. IF THE UNION COUNTY S&E STAFF OR NCDENR DETERMINES THAT EXCESSIVE SEDIMENTIS LEAVING THE SITE, A REVISED SEDIMENTATION AND EROSION CONTROL PLAN MAY BE REQUIRED, WITHASSOCIATED REQUIREMENTS FOR ADDITIONAL S&E MEASURES.3.ANY GRADING BEYOND THE DENUDED LIMITS SHOWN ON THE PLAN IS A VIOLATION AND IS SUBJECT TO A FINE.4.GRADING MORE THAN ONE ACRE WITHOUT AN APPROVED EROSION CONTROL PLAN IS A VIOLATION AND ISSUBJECT TO A FINE.5.APPROVAL OF CONSTRUCTION DOCUMENTS IS NOT AN AUTHORIZATION TO GRADE ADJACENT PROPERTIES.WHEN FIELD CONDITIONS WARRANT OFF-SITE GRADING, PERMISSION SHALL BE OBTAINED BY CONTRACTORFROM THE AFFECTED PROPERTY OWNERS ADN THE AUTHORITIES HAVING JURISDICTION SHALL BE NOTIFIED.6.CONTRACTOR SHALL MEET THE REQUIREMENTS SET FORTH IN THE "NEW GROUND STABILIZATIONREQUIREMENTS" NPDES PERMIT EFFECTIVE AUGUST 3, 2011 FOR THE EPA EFFLUENT GUIDELINES.7.CONTRACTOR SHALL APPOINT A REPRESENTATIVE TO MONITOR AND INSPECT GROUND COVER AT LEAST ONCEPER WEEK AND WITHIN 24 HOURS AFTER A STORM GREATER THAN 1/2 INCH. REPRESENTATIVE SHALL BE ALICENSED ENGINEER IN THE STATE OF SOUTH CAROLINA OR A CERTIFIED SITE INSPECTOR IN THE CURRENTSTANDING WITH SOUTH CAROLINA DHEC. CONTRACTOR PRODUCE AND KEEP ALL ONSITE ALL MONITORING ANDINSPECTION LOGS REQUIRED BY THE SWPPP PLAN AND AUTHORITIES HAVING JURISDICTION. CONTRACTORSHALL PROVIDE OWNER AND BLOC DESIGN REPRESENTATIVE NAME AND LICENSE OR CERTIFICATION NUMBERPRIOR TO INSTALLING EROSION CONTROL MEASURES.8.ALL SLOPES GREATER THAN 2.5:1 SHALL BE STABILIZED WITH EROSION MATTING.9.ADDITIONAL MEASURES MAY BE REQUIRED BY THE INSPECTOR TO CONTROL EROSION AND SEDIMENTATION OFTHE SITE.10.ALL PERIMETER DIKES, SWALES, DITCHES, PERIMETER SLOPES AND ALL SLOPES STEEPER THAN 3 HORIZONTALTO 1 VERTICAL (3:1) SHALL BE PROVIDED TEMPORARY OR PERMANENT STABILIZATION WITH GROUND COVER ASSOON AS PRACTICABLE BUT IN ANY EVENT WITHIN 7 CALENDAR DAYS FROM THE LAST LAND-DISTURBINGACTIVITY. ALL OTHER DISTURBED AREAS SHALL BE PROVIDED TEMPORARY OR PERMANENT STABILIZATION WITHGROUND COVER AS SOON AS PRACTICABLE BUT IN ANY EVENT WITHIN 14 CALENDAR DAYS FROM THE LASTLAND-DISTURBING ACTIVITY.11.CONTRACTOR TO ENSURE CONSTRUCTION SEDIMENT DOES NOT ENTER EXISTING STORM WATER BASIN. SHOULDCONSTRUCTION SEDIMENT ENTER THE EXISTING STORM WATER BASIN, IT WILL BE THE CONTRACTORSRESPONSIBILITY TO REMEDIATE THE DAMAGES, AT NO ADDITIONAL COST TO THE OWNER. REMEDIATION WILL BEBASED ON THE EXTENTS OF THE DAMAGE AND THE RECOMMENDATION OF THE ENGINEER.CONSTRUCTION SEQUENCE:1.SCHEDULE AND HOLD A PRE-CONSTRUCTION CONFERENCE PRIOR TO BEGINNING ANY LAND-DISTURBING ACTIVITIES. THIS CONFERENCESHOULD BE ATTENDED BY A REPRESENTATIVE OF THE FINANCIALLY RESPONSIBLE PARTY AND/OR THE GENERAL CONTRACTOR, GRADINGSUB-CONTRACTOR, EROSION CONTROL SUB-CONTRACTOR/NCDENR AND THE UNION COUNTY S&E OFFICE.2.OBTAIN LAND DISTURBING PERMIT AND PU\CARD, AND POST THE PLACARD ON SITE.3.OBTAIN AN APPROVED (STAMPED) EROSION AND SEDIMENT CONTROL PLAN AND KEEP IT ON SITE, EITHER IN THE INSPECTION BOX,CONSTRUCTION OFFICE OR WITH THE CONTRACTOR.4.INSTALL CONSTRUCTION EGRESS/EXIT, SILT FENCING, DIVERSION DITCHES, CHECK DAMS, AND OTHER INITIAL EROSION CONTROLMEASURES AS SPECIFIED IN THE PLAN. RESTORE SEDIMENT TRAP TO ORIGINAL DESIGN. REMOVE ONLY TREES AND GROUND COVERNECESSARY TO INSTALL THESE DEVICES.5.IF A STOCKPILE IS NECESSARY DUE TO RESTORATION OF THE SEDIMENT TRAP, PLACE A DOUBLE ROW OF SILT FENCE 10 FEET APART ATTHE LIMITS OF THE STOCKPILE AREA SHOWN ON THIS PLAN. TREES AND GROUNDCOVER MAY BE REMOVED ONLY AS NECESSARY FOR THISSTOCKPILE.6.PROVIDE TEMPORARY GROUNDCOVER FOR DIVERSION DITCHES AND SEDIMENT TRAPS WITHIN 3 DAYS OF COMPLETION.7.NOTIFY THE UNION COUNTY S&E SITE INSPECTOR AND NCDEQ AFTER MEASURES HAVE BEEN INSTALLED AND PROJECT HAS STARTED.8.BEGIN CLEARING, GRUBBING AND ROUGH GRADING OF SITE IN ACCORDANCE WITH THE APPROVED S&E CONTROL PLAN.9.PROVIDE ALL DISTURBED AREAS WITH GROUND COVER BASED ON THE SLOPES BELOW:A.NO SLOPE - WITHIN 14 CALENDAR DAYSB.MODERATE SLOPE (3:1 OR LESS)- WITHIN 10 CALENDAR DAYSC.STEEP SLOPE (3:1 OR GREATER) - WITHIN 7 CALENDAR DAYSD.TRAPS, BASIN AND DIVERSION DITCHES - WITHIN 7 CALENDAR DAYSE.AFTER COMPLETION OF ANY PHASE OF CLEARING, GRUBBING OR GRADING.THE SEEDING, SEEDBED PREPARATION, MULCH AND/ORROLLED EROSION CONTROL PRODUCT INSTALLATION MUST BE IN ACCORDANCE WITH THE SEEDING SCHEDULE PROVIDED IN THISEROSION AND SEDIMENT CONTROL PLAN.10.INSTALL STORM DRAIN SYSTEM AND PLACEMENT OF INLET PROTECTION AS EACH INLET IS INSTALLED.11.COMMENCE WITH FINE GRADING, INSTALLATION OF CURB, SIDEWALK, CONCRETE PAVING, GRAVEL DRIVEWAYS, AND BUILDING PADS.12.THE LAND DEVELOPMENT INSPECTOR SHOULD BE CALLED TO CONDUCT INSPECTIONS ON STORM DRAINAGE.13.STABILIZE SITE AS AREAS ARE BROUGHT TO FINISHED GRADE.14.AT THE CONCLUSION OF BUILDING OR IF LAND-DISTURBING ACTIVITY IS STOPPED FOR MORE THAN 30 CONSECUTIVE CALENDAR DAYS,PERMANENT VEGETATIVE COVER SHALL BE INSTALLED IN ACCORDANCE WITH THIS EROSION AND SEDIMENT CONTROL PLAN.15.REMOVE ALL EROSION CONTROL MEASURES AFTER NCDEQ AND THE UNION COUNTY S&E OFFICE APPROVAL OF PERMANENTSTABILIZATION.16.SUBMIT NOTICE OF TERMINATION (NOT) TO NCDEQ AS APPROPRIATE.
610 East Morehead St, Suite 250CHARLOTTE, NC 28202TEL [phone]FAX [phone]www.timmons.comYOUR VISION ACHIEVED THROUGH OURS.VIRGINIA NORTH CAROLINASite Development Residential Infrastructure TechnologyTHIS DRAWING PREPARED AT THECHARLOTTE OFFICE40685NORTH CAROLINA LICENSE NO. C-1652PRE-FINAL SUBMITTALAE DESIGN TRAINING AREASHELTERUnion County Sheriff's Office5/15/2018MILLS HARRIS ROADMARSHVILLE, NC12345ABCDSHEETOF16DESIGN: J. ZILKEDRAWN: J. ZILKEREVIEW: B. CRUTCHFIELDSHEETKEY PLANSUBMITTALSEALSCONSULTANTDESIGNERCNREVISIONS213 South Jefferson, Suite 1011Roanoke, VA 24011540.982.0800Clark Nexsen License Number: C-102873951 4/22/19 COUNTY COMMENTS2 5/08/19 COUNTY COMMENTSFRONT VIEWSIDE VIEW8" DOWN AND 4" FORWARDALONG TRENCH8" MINIMUM COVER OVERSKIRT *GRADEFILL SLOPESILT FENCE FABRICWOVEN WIRE FABRICSTEEL POST32" MIN. WIDTH NOTE:USE SILT FENCE ONLY WHEN DRAINAGE AREA DOES NOT EXCEED 1/4 ACRE ANDNEVER IN AREAS OF CONCENTRATED FLOW.MINIMUM 10 GAUGELINE WIRESSILT FENCE FABRICINSTALLED TO SECONDWIRE FROM TOPMINIMUM 12-1/2 GAUGEINTERMEDIATE WIRESGRADE3'-0"2'-0"24"8'-0" MAXIMUMMAINTENANCEINSPECT SEDIMENT FENCES AT LEAST ONCE A WEEK AND AFTER EACH RAINFALL.MAKE ANY REQUIRED REPAIRS IMMEDIATELY.SHOULD THE FABRIC OF A SEDIMENT FENCE COLLAPSE, TEAR, DECOMPOSE, ORBECOME INEFFECTIVE, REPLACE IT PROMPTLY.REMOVE SEDIMENT DEPOSITS AS NECESSARY TO PROVIDE ADEQUATE STORAGEVOLUME FOR THE NEXT RAIN AND TO REDUCE PRESSURE ON THE FENCE. TAKECARE TO AVOID UNDERMINING THE FENCE DURING CLEANOUT.REMOVE ALL FENCING MATERIALS AND UNSTABLE SEDIMENT DEPOSITS ANDBRING THE AREA TO GRADE AND STABILIZE IT AFTER THE CONTRIBUTINGDRAINAGE AREA HAS BEEN PROPERLY STABILIZED.CROSS SECTIONPROPOSED STREET,25' OR WIDTH OFWHICHEVER ISEXISTING ROADWAY6" MIN.PLAN VIEW35' MIN.ROADWAYEXISTING50' MIN.GREATER.NEW CONSTRUCTION15' MIN.12" MIN.2"-3" STONE TO BE USED(SURGE STONE OR RAILROADBALLAST)BUT SUFFICIENT TO KEEPSEDIMENT ON SITEFABRIC UNDER STONENOTES:1. PUT SILT FENCE OR TREE PROTECTION FENCE UP TO ENSURE CONSTRUCTION ENTRANCE IS USED.2. IF CONSTRUCTION ON THE SITES ARE SUCH THAT THE MUD IS NOT REMOVED BY THE VEHICLE TRAVELING OVER THE STONE, THEN THE TIRES OF THE VEHICLES MUST BE WASHED BEFORE ENTERING THE PUBLIC ROAD.3. MAINTAIN GRAVEL PAD IN A CONDITION TO PREVENT MUD OR SEDIMENT FROM LEAVING CONSTRUCTION SITE. ENTRANCE WILL REQUIRE PERIODIC REMOVAL OF SEDIMENT-LADEN STONE AND REPLACEMENT WITH FRESH STONE.MAINTENANCEMAINTAIN THE GRAVEL PAD IN A CONDITION TO PREVENTMUD OR SEDIMENT FROM LEAVING THE CONSTRUCTIONSITE. THIS MAY REQUIRE PERIODIC TOP DRESSING WITHTWO-INCH STONE. AFTER EACH RAINFALL, INSPECT ANYSTRUCTURE USED TO TRAP SEDIMENT AND CLEAN IT OUTAS NECESSARY. IMMEDIATELY REMOVE ALLOBJECTIONABLE MATERIALS SPILLED, WASHED, ORTRACKED ONTO PUBLIC ROADWAYS.EXISTING ROADWAY6" MIN.35' MIN.NEW CONSTRUCTION15' MIN.12" MIN.FABRIC UNDER STONEENTRANCE GRADE GREATERTHAN 2%6" TO 8" STONE RIDGE3' FILTER FABRICON GROUNDSTEEL FENCE POSTWIRE FENCEHARDWARE CLOTHFILTER OF #57WASHED STONEBURY 6" OF UPPER EDGE OFFILTER FABRIC IN TRENCHBURY WIRE FENCE ANDHARDWARE CLOTHTOP OF SILT FENCEMUST BE AT LEAST 1'ABOVE THE TOP OFTHE WASHED STONESILT FENCEFRONT VIEWSECTION VIEWSTEEL FENCEPOST SET MAX2' APART MIN. 18"INTO SOLID GROUNDBURY WIRE FENCE,FILTER FABRIC,AND HARDWARECLOTH IN TRENCH4' MIN.NOTES:1.REMOVE SEDIMENT WHEN HALF OF STONE OUTLET IS COVERED.2.REPLACE STONE AS NEEDED TO ENSURE DEWATERING.MAINTENANCESEE SILT FENCE THIS SHEET FOR MAINTENANCE INFORMATION.#57 WASHED STONE PLACED TO AHEIGHT OF 12"-18" MINIMUMABOVE THE TOP OF BOXGALVANIZEDHARDWAREWIRE EXTENDSTO THE TOP OFTHE BOXSTANDARD METALPOSTS 2'-0" INGROUNDNOTE:1.INSPECT INLET PROTECTION AND REMOVE SEDIMENTAFTER EACH RAIN EVENT. GRAVEL SHOULD BEREPLACED AND REPAIRS MADE AS NEEDED.GROUND STABILIZATIONSITE AREADESCRIPTIONSTABILIZATIONTIME FRAMESTABILIZATIONTIME EXCEPTIONS·PERIMETER DIKES,SWALES, DITCHES,AND SLOPES·HIGH QUALITYWATER (HQW)ZONES·SLOPES STEEPERTHAN 3:1·SLOPES 3:1 ORFLATTER·ALL OTHER AREAWITH SLOPEFLATTER THAN 4:17 DAYSNONE7 DAYSNONE7 DAYSIF SLOPES ARE 10' OR LESS INLENGTH AND ARE NOT STEEPERTHAN 2:1 14 DAYS ARE ALLOWED14 DAYS14 DAYS7-DAYS FOR SLOPES GREATERTHAN 50 FEET IN LENGTHNONE (EXCEPT FOR PERIMETERSAND HQW ZONES)* "EXTENSIONS OF TIME MAY BE APPROVED BY THE PERMITTING AUTHORITYBASED ON WEATHER OR OTHER SITE-SPECIFIC CONDITIONS THAT MAKECOMPLIANCE IMPRACTICABLE." (SECTION II. B (2)(b))AND MULCH IMMEDIATELY FOLLOWING EROSION OR OTHER DAMAGE.REFERTILIZE IF GROWTH IS NOT FULLY ADEQUATE. RESEED, REFERTILIZE,MULCHMAINTENANCESOIL AMENDMENTS SOFT RED WINTER WHEAT 30 SPECIES RATE (lb/ACRE)SEEDING MIXTURETEMPORARY SEEDINGTSPERMANENT SEEDINGPS"COOL SEASON" AUGUST 15 - APRIL 15 SPECIES RATE (lb/ACRE)"WARM SEASON" APRIL 15 - AUGUST 15 GERMAN OR RED TOP MILLET 10APPLY 4,000 lb/ACRE STRAW. THE GROUND SHOULD BE COMPLETELY COVERED WITH NO BARE SPOTLARGER THAN A QUARTER, THEN TACKED WITH EMULSIFIED ASPHALT. EMULSIFIED ASPHALT SHALLBE APPLIED AT A RATE HEAVY ENOUGH THAT THE ENTIRE AREA APPEARS BLACK IN COLOR.FOLLOW RECOMENDATIONS OF SOIL TEST OR APPLY 2,000LBS/ACRE GROUND AGRICULTURALLIMESTONE AND 1,000 LBS/ACRE 10-10-10 FERTILIZER.PERMANENT GROUNDCOVER: CENTIPEDE SOD N/A SPECIES RATE (lb/ACRE)"COOL SEASON" SEPTEMBER 1 - MAY 01AND MULCH IMMEDIATELY FOLLOWING EROSION OR OTHER DAMAGE.REFERTILIZE IF GROWTH IS NOT FULLY ADEQUATE. RE-SOD, RE-FERTILIZE,MULCHMAINTENANCESOIL AMENDMENTSAPPLY 4,000 lb/ACRE STRAW. THE GROUND SHOULD BE COMPLETELY COVERED WITH NO BARESPOT LARGER THAN A QUARTER, THEN TACKED WITH EMULSIFIED ASPHALT. EMULSIFIED ASPHALTSHALL BE APPLIED AT A RATE HEAVY ENOUGH THAT THE ENTIRE AREA APPEARS BLACK IN COLOR.TILL SOIL TO A DEPTH OF 4". APPLY LIME AT A RATE OF 70 LB PER 100 SF, OR 1.5 TONS PER ACRE.APPLY 10-20-20 FERTILIZER AT A RATE OF 20 LBS PER 1000 SF OR 850 LBS PER ACRE. THE FERTILIZERSHOULD BE EITHER SLOW TIME RELEASE OR APPLIED IN TWO APPLICATIONS, HALF AT TIME OFPLANTING AND THE SECOND HALF AFTER PERMANENT SEED GERMINATES.SELF-INSPECTION REPORT FOR LAND DISTURBING ACTIVITY AS REQUIREDBY NCGS 113A-54.115A NCAC 04B .0131 SELF-INSPECTIONSWHERE INSPECTIONS ARE REQUIRED BY G.S. 113A-54.1(E), THE FOLLOWINGAPPLY:(1) THE PERSON WHO PERFORMS THE INSPECTION SHALL MAKE A RECORDOF THE SITE INSPECTION BY DOCUMENTING THE FOLLOWING ITEMS:(A) ALL OF THE EROSION AND SEDIMENTATION CONTROL MEASURES,PRACTICES AND DEVICES, AS CALLED FOR IN A CONSTRUCTIONSEQUENCE CONSISTENT WITH THE APPROVED EROSION ANDSEDIMENTATION CONTROL PLAN, INCLUDING BUT NOT LIMITED TOSEDIMENTATION CONTROL BASINS, SEDIMENTATION TRAPS, SEDIMENTATIONPONDS, ROCK DAMS, TEMPORARY DIVERSIONS,TEMPORARY SLOPE DRAINS, ROCK CHECK DAMS, SEDIMENT FENCE ORBARRIERS, ALL FORMS OF INLET PROTECTION, STORM DRAINAGE FACILITIES,ENERGY DISSIPATERS, AND STABILIZATION METHODS OF OPEN CHANNELS,HAVE INITIALLY BEEN INSTALLED AND DO NOT SIGNIFICANTLY DEVIATE (ASDEFINED IN SUB-ITEM (1)(E) OF THIS RULE) FROM THE LOCATIONS,DIMENSIONS AND RELATIVE ELEVATIONS SHOWN ON THE APPROVEDEROSION AND SEDIMENTATION PLAN. SUCH DOCUMENTATION SHALL BEACCOMPLISHED BY INITIALING AND DATING EACH MEASURE OR PRACTICESHOWN ON A COPY OF THE APPROVED EROSION AND SEDIMENTATIONCONTROL PLAN OR BY COMPLETING, DATING AND SIGNING AN INSPECTIONREPORT THAT LISTS EACH MEASURE, PRACTICE OR DEVICE SHOWN ON THEAPPROVED EROSION AND SEDIMENTATION CONTROL PLAN. THISDOCUMENTATION IS REQUIRED ONLY UPON THE INITIAL INSTALLATION OFTHE EROSION AND SEDIMENTATION CONTROL MEASURES, PRACTICES ANDDEVICES AS SET FORTH BY THE APPROVED EROSION AND SEDIMENTATIONCONTROL PLAN OR IF THE MEASURES, PRACTICES AND DEVICES AREMODIFIED AFTER INITIAL INSTALLATION;(B) THE COMPLETION OF ANY PHASE OF GRADING FOR ALL GRADED SLOPESAND FILLS SHOWN ON THE APPROVED EROSION AND SEDIMENTATIONCONTROL PLAN, SPECIFICALLY NOTING THE LOCATION AND CONDITION OFTHE GRADED SLOPES AND FILLS. SUCH DOCUMENTATION SHALL BEACCOMPLISHED BY INITIALING AND DATING A COPY OF THE APPROVEDEROSION AND SEDIMENTATION CONTROL PLAN OR BY COMPLETING, DATINGAND SIGNING AN INSPECTION REPORT;(C) THE LOCATION OF TEMPORARY OR PERMANENT GROUND COVER, ANDTHAT THE INSTALLATION OF THE GROUND COVER DOES NOT SIGNIFICANTLYDEVIATE (AS DEFINED IN SUB-ITEM (1)(E) OF THIS RULE) FROM THEAPPROVED EROSION AND SEDIMENTATION CONTROL PLAN. SUCHDOCUMENTATION SHALL BE ACCOMPLISHED BY INITIALING AND DATING ACOPY OF THE APPROVED EROSION AND SEDIMENTATION CONTROL PLAN ORBY COMPLETING, DATING AND SIGNING AN INSPECTION REPORT;(D) THAT MAINTENANCE AND REPAIR REQUIREMENTS FOR ALL TEMPORARYAND PERMANENT EROSION AND SEDIMENTATION CONTROL MEASURES,PRACTICES AND DEVICES HAVE BEEN PERFORMED. SUCH DOCUMENTATIONSHALL BE ACCOMPLISHED BY COMPLETING,DATING AND SIGNING AN INSPECTION REPORT (THE GENERAL STORM WATERPERMIT MONITORING FORM MAY BE USED TO VERIFY THE MAINTENANCE ANDREPAIR REQUIREMENTS); AND(E) ANY SIGNIFICANT DEVIATIONS FROM THE APPROVED EROSION ANDSEDIMENTATION CONTROL PLAN, CORRECTIVE ACTIONS REQUIRED TOCORRECT THE DEVIATION AND COMPLETION OF THE CORRECTIVE ACTIONS.SUCH DOCUMENTATION SHALL BE ACCOMPLISHED BY INITIALING AND DATINGA COPY OF THE APPROVED EROSION AND SEDIMENTATION CONTROL PLANOR BY COMPLETING, DATING AND SIGNING AN INSPECTION REPORT. ASIGNIFICANT DEVIATION MEANS AN OMISSION, ALTERATION OR RELOCATIONOF AN EROSION OR SEDIMENTATION CONTROL MEASURE THAT PREVENTSTHE MEASURE FROM PERFORMING AS INTENDED.(2) THE DOCUMENTATION, WHETHER ON A COPY OF THE APPROVED EROSIONAND SEDIMENTATION CONTROL PLAN OR AN INSPECTION REPORT, SHALLINCLUDE THE NAME, ADDRESS, AFFILIATION, TELEPHONE NUMBER, ANDSIGNATURE OF THE PERSON CONDUCTING THE INSPECTION AND THE DATEOF THE INSPECTION. ANY RELEVANT LICENSES AND CERTIFICATIONS MAYALSO BE INCLUDED. ANY DOCUMENTATION OF INSPECTIONS THAT OCCUR ONA COPY OF THE APPROVED EROSION AND SEDIMENTATION CONTROL PLANSHALL OCCUR ON A SINGLE COPY OF THE PLAN AND THAT PLAN SHALL BEMADE AVAILABLE ON THE SITE. ANY INSPECTION REPORTS SHALL ALSO BEMADE AVAILABLE ON THE SITE.(3) THE INSPECTION SHALL BE PERFORMED DURING OR AFTER EACH OF THEFOLLOWING PHASES OF A PLAN:(A) INSTALLATION OF PERIMETER EROSION AND SEDIMENT CONTROLMEASURES;(B) CLEARING AND GRUBBING OF EXISTING GROUND COVER;(C) COMPLETION OF ANY PHASE OF GRADING OF SLOPES OR FILLS THATREQUIRES PROVISION OF TEMPORARY OR PERMANENT GROUND COVERPURSUANT TO G.S. 113A-57(2);(D) COMPLETION OF STORM DRAINAGE FACILITIES;(E) COMPLETION OF CONSTRUCTION OR DEVELOPMENT; AND(F) QUARTERLY UNTIL THE ESTABLISHMENT OF PERMANENT GROUND COVERSUFFICIENT TO RESTRAIN EROSION OR UNTIL THE FINANCIALLYRESPONSIBLE PARTY HAS CONVEYED OWNERSHIP OR CONTROL OF THETRACT OF LAND FOR WHICH THE EROSION AND SEDIMENTATION CONTROLPLAN HAS BEEN APPROVED AND THE AGENCY THAT APPROVED THE PLANHAS BEEN NOTIFIED. IF THE FINANCIALLY RESPONSIBLE PARTY HASCONVEYED OWNERSHIP OR CONTROL OF THE TRACT OF LAND FOR WHICHTHE EROSION AND SEDIMENTATION CONTROL PLAN HAS BEEN APPROVED,THE NEW OWNER OR PERSON IN CONTROL SHALL CONDUCT AND DOCUMENTINSPECTIONS QUARTERLY UNTIL THE ESTABLISHMENT OF PERMANENTGROUND COVER SUFFICIENT TO RESTRAIN EROSION. OR RYE GRAIN 40SLOPES GREATER THAN 3:1 REQUIRE SEEDING TO BE SECURED WITH EROSION CONTROL MATTING SLOPES GREATER THAN 3:1 REQUIRE SOLID CENTIPEDE SODCG500DRAINAGE &EROSION CONTROLDETAILSSEEDBED PREPARATION NOTES:1.SURFACE WATER CONTROL MEASURES TO BE INSTALLEDACCORDING TO PLAN.2.AREAS TO BE SEEDED SHALL BE RIPPED AND SPREAD WITHAVAILABLE TOPSOIL 3" DEEP. TOTAL SEEDBED PREPARED DEPTHSHALL BE 4" TO 6" DEEP.3.LOOSE ROCKS, ROOTS AND OTHER OBSTRUCTIONS SHALL BEREMOVED FROM THE SURFACE SO THAT THEY WILL NOTINTERFERE WITH ESTABLISHMENT AND MAINTENANCE OFVEGETATION. SURFACE FOR FINAL SEEDBED PREPARATION ATFINISHED GRADES SHOWN SHALL BE REASONABLY SMOOTH ANDUNIFORM.4.IF NO SOIL TEST IS TAKEN, FERTILIZER AND LIME TO BEACCORDING TO SEEDING SPECIFICATIONS DETAIL.5.IF SOIL TEST IS TAKEN, PROVIDE LIME AND FERTILIZERACCORDING TO SOIL TEST REPORT.6.LIME AND FERTILIZER SHALL BE APPLIED UNIFORMLY AND MIXEDWITH THE SOIL DURING SEEDBED PREPARATION.7.ADDITIONAL EROSION CONTROL MEASURES MAY BE REQUIREDDEPENDING ON FIELD CONDITION.8.MULCH TO BE TACKED OR MECHANICALLY TIED DOWN WITHINTWO DAYS AFTER MULCH IS SPREAD.9.ALL SLOPES GREATER THAN 2.5:1 SHALL BE STABILIZED WITHJUTE MESH.13EMERGENCY SPILLWAY ELEVATION8'2.5:1 MAX SLOPEELEVATION 2.5:1 MAX SLOPEELEVATIONCREST OF RISERTOP OF DAM BARRELRIPRAP OUTFALLPROTECTIONTEMPORARY SKIMMERSKIMMER SIZE = 4"ORIFICE SIZE = 2"SCHEDULE 40PVC PIPE (6' MIN.)PROVIDE A MINIMUM OF THREETEMPORARY BAFFLES BETWEENSTORM DRAINAGE DISCHARGES INTOTHE BASIN AND THE BASIN OUTFALLOF DAMCENTERLINE5'X5'X5" (MIN.) CONCRETEANTI-SEEP COLLAR LOCATEDSLIGHTLY DOWNSTREAM FROMCENTERLINE OF DAM (MINIMUM2' FROM PIPE JOINT)CONCRETE RISER CONNECT FLEXIBLETUBING TO ORIFICEEND SECTIONINFLOW STRUCTURE (REFER TOSTORM SEWER PROFILES)3:1AT ENTRANCE(CREST) OF SPILLWAYNO SCALEEMERGENCY SPILLWAY DETAIL3:1DEPTHWNOTE: INSTALL RUBBERGASKETS ON ALL PIPEJOINTSBARREL INV.OUT ELEVATIONNOTES:1.SEED AND PLACE MATTING FOR EROSION CONTROL ON INTERIOR AND EXTERIOR SIDESLOPES.2.INSTALL SKIMMER AND COUPLING TO RISER STRUCTURE OR DIRECTLY INTO EMBANKMENT 1 FT. FROM BOTTOM OF BASIN.3.THE ARM PIPE SHALL HAVE A MINIMUM LENGTH OF 6 FT. BETWEEN THE SKIMMER AND COUPLING.4.BASIN SHOULD BE CLEANED OUT WHEN CAPACITY REACHES AN ELEVATION REPRESENTING THAT THE SEDIMENTSTORAGE ZONE IS HALF-FULL OR EVERY 90 DAYS WHICHEVER COMES FIRST.5.THE TARP USED TO PROTECT THE WEIR SHALL BE THE WIDTH SPECIFIED. THE LENGTH OF THE TARP SHALL BE ACCORDINGTO AVAILABLE SUPPLY. IF MULTIPLE TARPS ARE TO BE USED, THEN TARPS SHALL BE OVERLAPPED AT LEAST 12". THEUPSTREAM 12" TARP SHALL OVERLAP THE DOWNSTREAM TARP. THE TARP SHALL BE 50 MIL. HEAVY DUTY SILVERTARPAULINS OR EQUIVALENT FOR U.V. RESISTANCE.6.PROVIDE A MINIMUM OF 3 COIR FIBER BAFFLES IN ACCORDANCE WITH PRACTICE STANDARD 6.65. TO EVENLY DISTRIBUTEFLOW ACROSS THE BASIN, REDUCING TURBULENCE.7.BAFFLE MATERIAL MUST BE SECURED AT THE BOTTOM AND SIDES USING STAPLES OR BY TRENCHING AS FOR A SILTFENCE.8.MOST OF THE SEDIMENT WILL ACCUMULATE IN THE FIRST BAY, SO THIS SHOULD BE READILY AVAILABLE FORMAINTENANCE.9.POND SHALL NOT BE CONVERTED FOR STORMWATER USE UNTIL APPROVED BY ENVIRONMENTAL ENGINEER.VENTSCREEN ACCESSIBLETHROUGH DOORFLOATBARREL PIPE LONGER THAN SHOWN.FLEXIBLE JOINT(RADIATOR HOSE)OUTLET END: CONNECTIONTO OUTLET PIPE OR RISERMAINTENANCEINSPECT TEMPORARY SEDIMENT BASINS AT LEASTWEEKLY AND AFTER EACH SIGNIFICANT (1/2 INCH ORGREATER) RAINFALL EVENT AND REPAIR IMMEDIATELY.REMOVE SEDIMENT AND RESTORE BASIN TO ITS ORIGINALDIMENSIONS WHEN IT ACCUMULATES TO ONE-HALF THEDESIGN DEPTH. PULL THE SKIMMER TO ONE SIDE SO THATTHE SEDIMENT UNDERNEATH IT CAN BE EXCAVATED.PLACE REMOVED SEDIMENT IN AN AREA WITH SEDIMENTCONTROLS.MAKE SURE VEGETATION GROWING IN THE BOTTOM OFTHE BASIN DOES NOT HOLD DOWN THE SKIMMER.IF THE SKIMMER IS CLOGGED WITH TRASH AND THERE ISWATER IN THE BASING, USUALLY JERKING ON THE ROPEWILL MAKE THE SKIMMER BOB UP AND DOWN ANDDISLODGE THE DEBRIS AND RESTORE FLOW. IF THISDOES NOT WORK, PULL THE SKIMMER OVER TO THE SIDEOF THE BASIN AND REMOVE THE DEBRIS. ALSO CHECKTHE ORIFICE INSIDE THE SKIMMER TO SEE IF IT ISCLOGGED; IF SO REMOVE THE DEBRIS.IF THE SKIMMER ARM OR BARREL PIPE IS CLOGGED, THEORIFICE CAN BE REMOVED AND THE OBSTRUCTIONCLEARED WITH A PLUMBER'S SNAKE OR BY FLUSHINGWITH WATER. BE SURE AND REPLACE THE ORIFICEBEFORE REPOSITIONING THE SKIMMER.FREEZING WEATHER CAN RESULT IN ICE FORMING IN THEBASIN. SOME SPECIAL PRECAUTIONS SHOULD BE TAKENIN THE WINTER TO PREVENT THE SKIMMER FROMPLUGGING WITH ICE.CHECK THE EMBANKMENT, SPILLWAYS, AND OUTLET FOREROSION DAMAGE AND INSPECT THE EMBANKMENT FORPIPING AND SETTLEMENT. MAKE ALL NECESSARYREPAIRS IMMEDIATELY. REMOVE ALL TRASH AND OTHERDEBRIS FROM THE RISER AND POOL AREA.TEMPORARY SEDIMENT BASINNO SCALEMIN.CLASS B STONEPAD (4'X4'X1' MIN.)BELOW SKIMMERBARREL INV. INELEVATIONCONCRETEANTI-FLOTATIONDEVICECUT-OFFTRENCH2' DEEP1.1
TIMMONS JOB NO.:
DATE:6/18/2019 BY:MWB
REVISED: RVW:BVC
1 Phase 2
DRAINAGE AREAS/REQ'D STORAGE ESTIMATED BASIN SIZE (RECTANGULAR)
Total drainage area (TDA) 5.06 ac Length(ft) Width(ft)
Disturbed area(DA)1.37 ac Bottom 33 13
Rqd sediment storage 1800xDA 2466 cf Top 49 29
BASIN CONFIGURATION PLANNED BASIN SIZE (REFER TO EROSION CONTROL PLAN)
Proposed sediment depth 3.25 ft Elev. Area (SF) Cumulative Volume (CF)
Depth of flow over spillway 0.75 ft 526 3490 0
Bottom elevation of basin 526 msl 527.00 4337 3914
Skimmer Invert elevation 527.00 msl 528.00 5240 8702
Sediment Storage elevation 529.25 msl 529.00 6200 14422
Spillway crest 529.25 msl 529.25 6472 16006
Top of Berm 530.00 msl 530.00 7507 21248
0
0
BASIN EFFICIENCY
Sediment storage required: 2466 cf
Sediment storage provided: 16006 cf
Surface area required:5987 sf
Surface area provided:6472 sf
Basin # 1 Phase 2 Basin # 1 Phase 2
2466 cf 16,006 cf
Skimmer Size:3 in.Skimmer Size:3 in.
# Of Skimmers:1 # Of Skimmers:1
Flow Rate (ft^3/day)Flow Rate (ft^3/day)
2765.00 2765.00
4146.00 4146.00
5528.00 5528.00
6910.00 6910.00
Orifice Size = 2.60 in. Orifice Size = 2.60 in.
SKIMMER CONNECTION PIPE LENGTH = 5 FT.
FAIRCLOTH SKIMMER DESIGN TABLE
CF drained Drawdown Factor CF drained Drawdown Factor
1.5" Skimmer 1728 1 day 960 4" Skimmer 20109 1 day 1601
3456 2 days 1920 40218 2 days 3202
5184 3 days 2880 60327 3 days 4803
6912 4 days 3840 80436 4 days 6404
12096 7 days 6720 140763 7 days 11207
2" Skimmer 3283 1 day 1123 5" Skimmer 32832 1 day 1642
6566 2 days 2246 65664 2 days 3283
9849 3 days 3369 98496 3 days 4926
13132 4 days 4492 131328 4 days 6568
22981 7 days 7861 229824 7 days 11491
2.5" Skimmer 6234 1 day 1270 6" Skimmer 51840 1 day 1814
12468 2 days 2540 103680 2 days 3628
18702 3 days 3810 155520 3 days 5442
24936 4 days 5080 207360 4 days 7256
43638 7 days 8890 362880 7 days 12701
3" Skimmer 9744 1 day 1382 8" Skimmer 97978 1 day 1987
19548 2 days 2765 195956 2 days 3974
29322 3 days 4146 293934 3 days 5961
39096 4 days 5528 391912 4 days 7948
68418 7 days 9677 658846 7 days 13909
This table contains maximum
drainage volumes for a given
Skimmer size and drawdown
period.
The orifice area is calculated by
dividing the Provided storage
volume by the corresponding
Factor. The factors are taken from
the table and were generated
assuming a constant head.
The diameter of the orifice is
calculated by: (2*(√(Area/3.14))
3 0.87 3 2.22
4 0.75 4 1.92
5 0.67 5 1.72
*Calculations reflect J.W. Faircloth & Son, Inc. faircloth skimmer technical sizing instructions.
Required Volume Provided Volume
Total Required Sediment Storage:Total Provided Sediment Storage:
Draw Down Time (Days)Required Orifice Diameter (in.)Draw Down Time (Days)Required Orifice Diameter (in.)
2 1.07 2 2.71
SKIMMER/ORIFICE DESIGN
SEDIMENT BASIN CALCULATIONS
Union County Training
40685
FAIRCLOTH SKIMMER TYPE BASIN DESIGN WITH RISER
Project:
Location:
Project Number:
Date:
Designed:MDR
Checked:VJC
Outlet ID:
Pipe diameter=24 inches
Pipe slope=0.05 %
Roughness Coef.=0.013
Full Flow Capacity=5.06 cfs
Full flow velocity=1.61 ft/sec
Zone from graph above =1
Is grade of apron 10% or more:N Y/N
1 Length =8.0 ft.
Outlet pipe diameter=24 in.Width at Outlet =6.0 ft.
Outlet flowrate=5.1 cfs Width at end of Pad=15.2 ft.
Outlet velocity=1.61 ft/sec Stone diameter =4 in.
Material =Class A Thickness =9 in.
Zone Material Diameter Thickness Length
1 Class A 4 9 4 x D(o)
2 Class B 8 18 6 x D(o)
3 Class I 10 25.5 8 x D(o)
4 Class I 10 25.5 8 x D(o)
5 Class II 14 34.5 10 x D(o)
6 Class II 14 34.5 10 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
Riprap Outlet Protection Design
O-1
Zone used =
Special study required
Union County Sheriff's Office Firing Range
Union County, NC
5404
Jun-24-2015
1.6 ft/sec
0
5
10
15
20
25
012345678910Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Project:
Location:
Project Number:
Date:
Designed:MDR
Checked:VJC
Outlet ID:
Pipe diameter=18 inches
Pipe slope=0.05 %
Roughness Coef.=0.013
Full Flow Capacity=2.35 cfs
Full flow velocity=1.33 ft/sec
Zone from graph above =1
Is grade of apron 10% or more:N Y/N
1 Length =6.0 ft.
Outlet pipe diameter=18 in.Width at Outlet =4.5 ft.
Outlet flowrate=2.3 cfs Width at end of Pad=11.4 ft.
Outlet velocity=1.33 ft/sec Stone diameter =4 in.
Material =Class A Thickness =9 in.
Zone Material Diameter Thickness Length
1 Class A 4 9 4 x D(o)
2 Class B 8 18 6 x D(o)
3 Class I 10 25.5 8 x D(o)
4 Class I 10 25.5 8 x D(o)
5 Class II 14 34.5 10 x D(o)
6 Class II 14 34.5 10 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
Special study required
Riprap Outlet Protection Design
Union County Sheriff's Office Firing Range
Union County, NC
5404
Jun-24-2015
O-2
Zone used =
1.3 ft/sec0
5
10
15
20
25
012345678910Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Project:
Location:
Project Number:
Date:
Designed:MDR
Checked:VJC
Outlet ID:
Pipe diameter=6 inches
Pipe slope=1 %
Roughness Coef.=0.009
Full Flow Capacity=0.81 cfs
Full flow velocity=4.13 ft/sec
Zone from graph above =1
Is grade of apron 10% or more:N Y/N
1 Length =2.0 ft.
Outlet pipe diameter=6 in.Width at Outlet =1.5 ft.
Outlet flowrate=0.8 cfs Width at end of Pad=3.8 ft.
Outlet velocity=4.13 ft/sec Stone diameter =4 in.
Material =Class A Thickness =9 in.
Zone Material Diameter Thickness Length
1 Class A 4 9 4 x D(o)
2 Class B 8 18 6 x D(o)
3 Class I 10 25.5 8 x D(o)
4 Class I 10 25.5 8 x D(o)
5 Class II 14 34.5 10 x D(o)
6 Class II 14 34.5 10 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
Special study required
Riprap Outlet Protection Design
Union County Sheriff's Office Firing Range
Union County, NC
5404
Jun-24-2015
Skimmer Outlet
Zone used =
4.1 ft/sec
0
5
10
15
20
25
012345678910Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7
Project:
Location:
Project Number:
Date:
Designed:MDR
Checked:VJC
Outlet ID:
Pipe diameter=10 inches
Pipe slope=6.94 %
Roughness Coef.=0.013
Full Flow Capacity=5.77 cfs
Full flow velocity=10.58 ft/sec
Zone from graph above =2
Is grade of apron 10% or more:N Y/N
2 Length =5.0 ft.
Outlet pipe diameter=10 in.Width at Outlet =2.5 ft.
Outlet flowrate=5.8 cfs Width at end of Pad=8.3 ft.
Outlet velocity=10.58 ft/sec Stone diameter =8 in.
Material =Class B Thickness =18 in.
Zone Material Diameter Thickness Length
1 Class A 4 9 4 x D(o)
2 Class B 8 18 6 x D(o)
3 Class I 10 25.5 8 x D(o)
4 Class I 10 25.5 8 x D(o)
5 Class II 14 34.5 10 x D(o)
6 Class II 14 34.5 10 x D(o)
7
Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual
Special study required
Riprap Outlet Protection Design
Union County Sheriff's Office Firing Range
Union County, NC
5404
Jun-24-2015
RD Outlet
Zone used =
10.6 ft/sec
0
5
10
15
20
25
012345678910Velocity (ft/sec)Pipe diameter (ft)
Figure 8.06.b.1
Zone 1
Zone 2
Zone 3
Zone 4
Zone 5
Zone 6
Zone 7