20011381 Ver 1_Stormwater Info_19981112 (2)

I
0sc once
T�chn1dogy, P.A.
Envitonmet" i i
2050 Northpoint Drive • Suite A • Winston - Salem, NC 27106
Phone [phone] • Fax [phone]
e -mail geosci@geotec com
GRADING, EROSION AND
SEDIMENTATION CONTROL PLAN
PATTERSON AVENUE WEST
Phase I - Temporary Grading
TAX LOTS 56C and 65
WINSTON- SALEM, NC
PREPARED FOR
PTR, INC.
PREPARED BY
GEOSCIENCE & TECHNOLOGY, P.A.
April, 1998
am w
VV Ierr
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CERTIFICATION
I hereby certify this day of , 1998 that this report was prepared
by us or under our direct supervision in compliance with generally accepted industry standards
Stephen Auffinger, PE
Senior Civil Engineer
Patterson Avenue West, Phase I April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 1

TABLE OF CONTENTS
page
Certification i
1 Project Description 1
2 Site Description 1
3 Adjacent Property 1
4 Drainage Patterns and Hydrology 2
5 Soils 2
6 Bedrock and Groundwater 3
7 Planned Erosion and Sedimentation Control Practices 3
8 Construction Schedule 4
9 Maintenance Plan 4
LIST OF FIGURES (after the body of the report)
1 Vicinity Map
2 G1 Existing Conditions ( "D" size bound separately)
3 G2 Proposed Grading ( "D" size bound separately)
APPENDIX
A Hydrology and Earthwork Calculations
B Technical Specifications
C Checklist
Patterson Avenue West, Phase I April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page u

Project Description
The project site is located on the west side of Patterson Avenue in Winston -Salem, approximately
1400 feet north of the intersection of Motor Road The western property boundary abuts NC
Route 52 The purpose of the project is to construct a retail sales area for mobile home sales A
vicinity map is shown as Figure 1
Overall phasing of this project is as follows
Phase I - Temporary Grading This includes grading at the front of the site to the final lirruts of the
project, and a temporary embankment at the rear of the property to hold soil for the final phases of
grading To access the rear of the site, a temporary crossing of Leak Fork Creek will be provided
Phase II - Construction of the main section of channel at the rear of the property This will be
accomplished by leaving embankment dams of existing in place soil between the existing creek and
new channel at both ends The channel will be constructed dry, by starting at the low end and
proceeding towards the high end Flood fringe areas will be constructed along the floodway
channel These areas will then be stabilized prior to proceeding with the next Phase
Phase III - Final Grading Removal of the dams during dry weather flow, and subsequent
redirection of Leak Fork Creek to it's new location in the channel The downstream dam will be
removed first, and the transitional area stabilized The upstream dam will the be removed followed
immediately by stabilization The final portion of this phase will be to remove the temporary
crossing, regrade and stabilize the rear portion of the site to its final elevations
The Grading, Erosion and Sedimentation Control Plans for Phase II and III will be submitted
concurrently, and at a later date As part of this plan, we are required to apply to the Federal
Emergency Management Agency (FEMA) for flood map revision
2 Site Description
The site consists of tax lots 56C and 65, encompassing an area of 9 47 acres The dimensions are
approximately 820 feet in the north -south direction by 505 feet in depth The frontage on Patterson
Avenue is approximately 500 feet Tax lot 66B is not included in this project, and lies between
Patterson Avenue and the south side of the subject site
Leak Fork Creek, a tributary to Mill Creek, flows north through the east side of the site The
centerline of the dry weather creek, 100 year floodway, and flood fringe are presented on Figure
G 1 The west side of the site has steep topography, tending from an elevation of approximately
870 or higher along Route 52, down to the base of approximately 830 The area between the creek
and the hill is relatively flat, draining towards the creek, and consisting of a substantial floodway
fringe area
An 18" City sanitary sewer runs roughly parallel to the creek, flowing north A 54" storm sewer
crosses under Patterson Ave , and discharges into the creek approximately 450 feet south of the
northeast property corner
3 Adjacent Property
Land use in the vicinity is commercial, with mobile home assembly and sales, and automotive
repair and sales NC Route 52 is immediately west A 68' wide overhead electric power
transmission power line runs in a Right of Way on the west side of the property
Patterson Avenue West, Phase I April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 1

4 Drainage Patterns and Hydrology
For the purposes of designing drainage structures the site and upgradient land have been divided
into 5 discrete areas These areas are shown and modeled in the calculations (Appendix A)
Areas 1 through 5 contribute to Leak Fork Creek through the project area, for a total drainage area
of approximately 3 5 square miles This entire area is urbanized to a large extent, tending towards
increasing density at the south end
Leak Fork Creek under Motor Road has a 100 year storm flow of 1460 cubic feet per second (cfs),
and the contributing hydrologic area is 2 8 square miles' This area is mixed use, and is a subset
of area 5 We are using this information to calibrate our model of storm flows contributory to Leak
Fork Creek in the project area We estimate the time of concentration (T.) to Motor Road to be 30
minutes Using graphical peak discharge analysis2, we calculate a weighted curve number of 44
We believe this relatively low curve number for the mixed use area is reasonable, in that it reflects
the relatively large amount of forested area in the drainage basin, and the conservative nature of the
analysis
Since this 2 8 square mile area comprises the most dense urbanization of the total study area,
estimating storm flows of the less dense areas by using a curve number of 44 is a conservative
approach for the less dense northern areas The T,, is calculated for each contributing area
For the purposes of tins project, the 10 year storm flow (Qlo) will be used to design erosion
control features, the 25 year storm flow (Q25) will be used to design permanent culverts, and the
100 year storm flow (Q100) will be used to design the rechannelization of Leak Fork Creek
A summary of the hydrology of the study area is presented below
Description Acres T, (min) Q,O, (cfs) Q25 (cfs) Q11, (cfs)
Area 1 15 6 - -- 12 5 7
Area 2 16 10 - -- 94 47
Area 3 15 7 - -- 11 5 3
Area 4 150 14 - -- 59 30
Area 5 2065 32 1680 - -- - --
Areas 2 & 5 2081 32 1700 - -- - --
Areas 2, 4 & 5 2231 33 1750 - -- 360
Total Area 2261 34 1750 - -- 360
5 Soils
The soil in the project area is eroded Pacolet clay loam in the F slope class, Pacolet fine sandy loam
in the C slope class, and Wehadkee soils' A portion of the Soil Survey map is included in
Appendix A
Pacolet soils are considered well drained upland soils with permeability rates of 2 to 6 inches per
hour in the top 6 inches of fine sandy loam, decreasing to 0 6 to 2 inches per hour from 6 to 72
inches in the clay, clay loam, and sandy clay loam layers The soil erodability factor (K value) is
reported in the Davie County Soil Survey as 0 24 for the top 7 inches and 0 28 from 7 to 60 inches
in depth
' According to Al Ray of the WS/FC City Engineer's office, by telephone [phone], on March 3,1998
"'Urban Hydrology for Small Watersheds (TR 55) ", USDA, June, 1986
3 Solt Survey of Forsyth County, North Carolina, USDA SCS, May, 1976 =
Patterson Avenue Site, Tax Lots 32A, 32B, 21B, And 21A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 2

Wehadkee soils are nearly level, poorly drained, making up stream flood plains They are recently
deposited alluvial soils The K value is reported in the Rockingham County Soil Survey as 0 32
6 Bedrock and Groundwater
Since the site plan calls for filling, intrusive investigation work is not warranted Based on the
depth of the existing dry weather creek flow relative to the adjacent soil surface, groundwater is
likely to be 5' or so below grade
7 Planned Erosion and Sedimentation Control Practices
Technical specifications for sitework are attached as Appendix C For reporting purposes, a
narrative description of the work follows
Land Grading
Approximately 65,000 cubic yards of earth materials will be used for the fill, borrowed from a site
across Patterson Avenue This does not account for the swell factor that should be expected when
transporting loosened material, or any shrink factor as a result of compaction Filling will be done
along the Patterson Avenue frontage The remaining fill volume will be applied to 2 27 acres
towards the rear of the property The sides of the fills will utilize slopes of 15 horizontal to 1
vertical (1 5 1)
The linuts of the fill area at the front of the site are set by the existing grade along Patterson
Avenue, and by a 50% encroachment into the flood fringe area on the east side of Leak Fork
Creek This fill area will be graded with a 2% grade towards the rear of the site to coincide with the
Phase III grading plan
The limits of the fill area at the back of the site are set by the future channel excavation area on the
west and south sides, a sewer easement on the northeast side, and by a 50% encroachment into the
flood fringe area on the west side of Leak Fork Creek The fill area will be graded with a 4% grade
towards the rear of the site to facilitate drainage of the stockpiled material The fill above the sewer
line will be graded to 2% since it is not planned to be moved again and will become part of the
permanent grading
The amount of fill height proposed for temporary grading on top of the existing 18" sanitary sewer
is 4 feet above the existing grade The existing soil cover is approximately 6 feet, therefore the
proposed cover will be increased to 10 feet4 Final grades may be as high as 19 feet over the
existing sewer, pending agreements with the Winston- Salem/ Forsyth County City Engineer's
office
Surface Roughening
Surface roughening will be used throughout the project at the steep fill slopes
Temporary Construction Access
A temporary construction access will be constructed of crushed stone to access the west side of the
site at Patterson Ave A temporary crossing over Leak Fork Creek will be accomplished by using
three parallel sections, each 40 foot long, of 54" corrugated metal pipe (CMP) The grade of the
pipe will be set at creek bottom to minimize disturbance of dry weather flow A surcharge of 0 5
4 This is the maximum height of cover that would be considered without further study, according to Ronnie Vernon
of the WS/FC Engineer's office by telephone [phone] on 4 -17 -98
Patterson Avenue Site, Tax Lots 32A, 32B, 21B, And 2 1 A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 3

feet over the pipe crowns will carry the 10 year design storm of 360 cfs Based on a creek invert
of 825 3, this puts high water upstream at 830 3 This will cause a back up of water 220 feet
upstream of the crossing, to approximately 120 feet north of the southern property line
Outlet Protection
Velocity out of the 54" CMPs at the 10 year design flow will be 5 6 fps The downstream flow
depth will be greater than on -half of the pipe diameter, therefore causing a maximum tailwater
condition As calculated, the required median size of rip rap (d50) is less than 2 -1/2 ", and the
length of the outlet structure is less than 20 feet Due to the configuration of the creek banks, the
width of the structure will be set by installing rip rap to the elevation of the pipe crown or 4 feet
from the edge of the outer pipe, whichever is less
Temporary Seeding
Temporary seeding will be used throughout the project All fill areas will be seeded with annual
grasses
Sediment Fence
Sediment fence will be used at the base of all fills This has the added benefit of delineation of the
fill areas The fence along the east fill area, next to Patterson Ave , will be the filter type Fence
around the main fill area on the west side of the site will be used to redirect runoff into the sediment
basins
Mulching
Mulching using wheat straw will be done on the site areas to receive vegetation, in order to limit
soil erosion
Diversion
Runoff from the 5 drainage areas discussed in Section 4 will be separated and diverted by the
sediment fences controlling the fill areas This minimizes the sediment basin areas
Sediment Basins
Two sediment basins will be constructed adjacent to the fill at the west side of the site to control
sedimentation off of this feature The area to control is 2 27 acres A rrummum time of
concentration of 5 minutes yields a peak 10 year discharge of 14 1 cfs The total volume of the
basins are sized at 1800 cubic feet per acre, or a volume or 4080 cubic feet The acreage of the
basins are 1% of the discharge flow, or 6140 square feet The depth of the basins are therefore
0 66 feet, or 9 inches No freeboard will be provided, since the basins are all below grade The
sides are 2 1 slopes Discharge will be by sheet flow over the low end of the ponds
The depth of the basins has been increased to 17 feet to accommodate sediment storage The two
pond areas are split by 40% to 60 %, in proportion to the drainage areas served
8 Construction Schedule
1 Obtain plan approval and other applicable permits
2 Set baseline elevation control Flag the work limits and property corners
3 Install the access roadway with the 54" CMP
Patterson Avenue Site, Tax Lots 32A, 3213, 2113, And 2 1 A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 4

4 Install sediment fence where shown, 1/2 the distance into the flood fringe area
5 Clear trees from the site areas to be disturbed
6 Excavate for the sedimentation basins
7 Perform filling operations
8 Lime, fertilize, seed and mulch
9 Inspect site weekly and after rainfall events Make repairs as necessary
10 After site is stabilized, remove all temporary measures, including the sedimentation
basin and the silt fence
9 Maintenance Plan
All erosion and sediment control practices will be checked for stability and operation following
every runoff producing rainfall but not less than once per week Any needed repairs will be made
immediately to maintain practices as designed
The sediment basins will be cleaned out when the level of sediment reaches F from the outlet
All seeded areas will be fertilized, re- seeded as necessary, and mulched in accordance with the
technical specifications to maintain a vigorous, dense vegetation
I
Patterson Avenue Site, Tax Lots 32A, 32B, 2113, And 21A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page 5

FIGURES
Patterson Avenue Site, Tax Lots 32A, 32B, 21B, And 2 1 A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page A

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APPENDIX A
Drainage and Earthwork Calculations
Patterson Avenue Site, Tax Lots 32A, 32B, 21B, And 21A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page A

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TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 5 TO MOTOR ROAD
4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 1792 78,481
1792 78,481
ACCEPTABLE
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 100yr
RAINFALL, P (24 hour)= 7 51n
RUNOFF, Q= 1 371n
TIME OF CONCENTRATION, Tc= 32min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 00%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 35
0 10 -0 50
UNIT PEAK DISCHARGE, qu= 381csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp= 1460 Ocfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 1
DESCRIPTION
Mixed Use
CN AREA (acres) CN x AREA
44 15 657
15 657
WEIGHTED CN= 44
STORM FREQUENCY= 25yr
RAINFALL, P (24 hour)= 5 91n
RUNOFF, Q= 0 691n
TIME OF CONCENTRATION, Tc= 6mm
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 45
UNIT PEAK DISCHARGE, qu= 713csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp=l 11 5cfs
4/25/98
ACCEPTABLE
RANGE
40 -98
5 -600
0-50%
0 10 -0 50

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 1 4/25/98
DESCRIPTION CN AREA acres ON x AREA
Mixed Use 44 15 657
15 657
ACCEPTABLE
PEAK DISCHARGE, qp= 5 7cfs
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 Sin
RUNOFF, Q= 0 48in
TIME OF CONCENTRATION, Tc= 6mm
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50
0 10 -0 50
UNIT PEAK DISCHARGE, qu= 508csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp= 5 7cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 2
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 16 701
16 701
4/25/98
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 25yr
RAINFALL, P (24 hour)= 5 91n
RUNOFF, Q= 0 691n
TIME OF CONCENTRATION, Tc= 10min 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 45 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 546csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp= 9 4cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 2
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 16 701
16 701
4/25/98
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 Sin
RUNOFF, Q= 0 48in
TIME OF CONCENTRATION, Tc= 10mm 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 395csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp= 4 7cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 3
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 15 657
15 657
4/25/98
ACCEPTABLE
INITIAL ABSTRACTION, la= 2 651
la/P= 0 45 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 658csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp=l 10 6cfs
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 25yr
RAINFALL, P (24 hour)= 5 91n
RUNOFF, Q= 0 691n
TIME OF CONCENTRATION, Tc= 7min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 45 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 658csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp=l 10 6cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
MV:m]
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 15 657
15 657
4/25/98
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 31n
RUNOFF, Q= 0 481n
TIME OF CONCENTRATION, Tc= 7mm 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 471csm /m
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp= 5 3cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 4 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 150 6,569
150 6,569
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 25yr
RAINFALL, P (24 hour)= 5 91n
RUNOFF, Q= 0 691n
TIME OF CONCENTRATION, Tc= 14min 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 3 5acres
= 2 3% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 45 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 456csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 80
PEAK DISCHARGE, qp= 58 6cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 4 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 150 6,569
150 6,569
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 31n
RUNOFF, Q= 0 481n
TIME OF CONCENTRATION, Tc= 14min 5 -600
RAINFALL DISTRIBUTION TYPE= 11
POND AND SWAMP AREAS= 3 5acres
= 2 3% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 334csmrn
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 80
PEAK DISCHARGE, qp= 30 Ocfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREA 5 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2065 90,437
2065 90,437
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 100yr
RAINFALL, P (24 hour)= 7 51n
RUNOFF, Q= 1 371n
TIME OF CONCENTRATION, Tc= 32min 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 00% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 35 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 381csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp=l 1682 4cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREAS 2 & 5
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2081 91,137
2081 91,137
4/25/98
ACCEPTABLE
RANGE
WEIGHTED CN= 44 40 -98
STORM FREQUENCY= 100yr
RAINFALL, P (24 hour)= 7 51n
RUNOFF, Q= 1 371n
TIME OF CONCENTRATION, Tc= 32min 5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 0 Oacres
= 0 0% 0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 35 0 10 -0 50
UNIT PEAK DISCHARGE, qu= 381csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 1 00
PEAK DISCHARGE, qp=l 1695 5cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREAS 2,4 & 5 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2231 97,707
2231 97,707
ACCEPTABLE
PEAK DISCHARGE, qp=l 1754 Ocfs
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 100yr
RAINFALL, P (24 hour)= 7 Sin
RUNOFF, Q= 1 37m
TIME OF CONCENTRATION, Tc= 33min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 3 5acres
= 0 2%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 35
0 10 -0 50
UNIT PEAK DISCHARGE, qu= 374csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 98
PEAK DISCHARGE, qp=l 1754 Ocfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
AREAS 2,4 & 5 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2231 97,707
2231 97,707
ACCEPTABLE
PEAK DISCHARGE, qp= 356 lcfs
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 Sin
RUNOFF, Q= 0 481n
TIME OF CONCENTRATION, Tc= 33min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 3 5acres
= 0 2%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50
0 10 -0 50
UNIT PEAK DISCHARGE, qu= 217csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 98
PEAK DISCHARGE, qp= 356 lcfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
TOTAL AREA 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2261 99,020
2261 99,020
ACCEPTABLE
PEAK DISCHARGE, qp= 1747 5cfs
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 100yr
RAINFALL, P (24 hour)= 7 51n
RUNOFF, Q= 1 371n
TIME OF CONCENTRATION, Tc= 34min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 3 5acres
= 0 2%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 35
0 10 -0 50
UNIT PEAK DISCHARGE, qu= 368csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 98
PEAK DISCHARGE, qp= 1747 5cfs

TR55 Patterson West
DRAINAGE CALCULATIONS
SCS TR55 GRAPHICAL PEAK DISCHARGE METHOD
TOTAL AREA 4/25/98
DESCRIPTION CN AREA acres CN x AREA
Mixed Use 44 2261 99,020
2261 99,020
ACCEPTABLE
RANGE
WEIGHTED CN= 44
40 -98
STORM FREQUENCY= 10yr
RAINFALL, P (24 hour)= 5 Sin
RUNOFF, Q= 0 481n
TIME OF CONCENTRATION, Tc= 34min
5 -600
RAINFALL DISTRIBUTION TYPE= II
POND AND SWAMP AREAS= 3 5acres
= 0 2%
0-50%
INITIAL ABSTRACTION, la= 2 651
la/P= 0 50
010-050
UNIT PEAK DISCHARGE, qu= 213csm /in
ADJUSTMENT FACTOR FOR POND AND SWAMP AREAS, Fp= 0 98
PEAK DISCHARGE, qp= 355 4cfs

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8 06 4
Rev 1203

98 129 Patterson West Mannings Patterson West 4/25/98
Mannin s Formula- Trapezoidal Ditch
Side slopes
Bottom width
n
S
2
H 1 V
20
feet
0 025
00045
Depth
Width
Area
W P
R
V
Q
Td sf
200
2800
4800
2894
1 66
560
269
056
220
2880
5368
2984
1 80
592
318
062
240
2960
5952
3073
1 94
621
370
067
260
3040
6552
31 63
207
650
426
073
280
31 20
71 68
3252
220
677
485
079
300
3200
7800
3342
233
704
549
084
320
3280
8448
3431
246
729
616
090
340
3360
91 12
3521
259
754
687
095
360
3440
9792
3610
271
778
762
101
380
3520
10488
3699
284
801
840
107
400
3600
11200
3789
296
824
923
1 12
420
3680
11928
3878
308
846
1009
1 18
440
3760
12672
3968
319
867
1099
124
460
3840
13432
4057
331
888
1193
1 29
480
3920
14208
4147
343
909
1292
1 35
500
4000
15000
4236
354
929
1394
140
520
4080
15808
4326
365
949
1500
146
540
41 60
16632
4415
377
968
1611
152
560
4240
17472
4504
388
987
1725
1 57
580
4320
18328
4594
399
1006
1844
1 63
600
4400
19200
4683
410
1025
1967
1 68
620
4480
20088
4773
421
1043
2095
174
640
4560
20992
4862
432
1061
2226
1 80
660
4640
21912
4952
443
1078
2363
185
680
4720
22848
5041
453
1096
2503
191
700
4800
23800
51 30
464
11 13
2648
1 97
Page 1

')T"" C90 for Type II Blocks
<ir racks
un„ drainage structures shall
hmensions shall be 100 mm x
nt IFASTM C139
ial feet the requirements of
�m ?00 mm x 400 mm The
�r ie N
A that it shall meet the
be proportioned as shown
nu No more water shall be
7 all be applicable to all
onry cement meeting the
nor i of Mix No 1, except
rq of the test specimens
omposed of I part Type S
Section 1042
masonry cement and 3 parts sand The Contractor shall furnished a Type 3 certification
certifying that the Type M or Type S masonry cement meets these specifications
1040 -9 GROUT FOR SLOPE PROTECTION PAVING
Grout for slope protection paving shall be a nuxture of I part portland cement to 3 parts
of mortar sand with no more water added than is necessary to make a workable mixture
The provisions of Article 1040 -4, 1040 -6, and 1040 -7 shall be applicable to all cement, t
mortar sand, and water
SECTION 1042
RIP RAP MATERIALS
1042 -1 PLAIN RIP RAP
Stone for plain np rap shall consist of field stone or rough unhewn quarry stone The
stone shall be sound, tough, dense, resistant to the action of air and water, and suitable in all
other respects for the purpose intended Where broken concrete from demolished structures
or pavement is available, it may be used in place of stone provided that such use meets with
the approval of the Engineer However, the use of broken concrete which contains
reinforcing steel will not be permitted
All stone shall meet the approval to the Engineer While no specific gradation is
required, the various sizes of the stone shall be equally distributed within the required size
range The size of an individual stone particle will be deternuned by measuring its long
dimension
Stone or broken concrete for Rip Rap shall meet the requirements of Table 1042 -1 for the
class and size distribution
TABLE 1042 -1
ACCEPTANCE CRITERIA FOR RIP RAP
AND STONE FOR EROSION CONTROL
REQUIRED STONE SIZES - MILLIMETE
CLASS
MINIMUM
MIDRANGE Z
MAXIMUM
A
50
100
150
B
125
200
300
1
125
250
425
2
225
350
575
No more than 5 0% of the material furnished can be less than the minunum size specified
nor no more than 10 0% of the material can exceed the maximum size specified
1042 -2 FILTER FABRIC
The filter fabric shall meet the requirements of Section 1056 for Type 2 fabric
547
I ,

APPENDIX B
Technical Specifications
Patterson Avenue Site, Tax Lots 32A, 32B, 21 B, And 21 A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page B

TECHNICAL PROVISIONS
TABLE OF CONTENTS
DIVISION 2 - SITEWORK
02110 Site Clearing
02200 Earthwork
02725 Site Drainage and Sewerage Piping
02905 Landscaping

SITE CLEARING Page 02110 -1
SECTION 02110
SITE CLEARING
PART 1 GENERAL
1 1 SECTION INCLUDES
A Removal of surface debris, designated plant life, and grass
B. Rough grading, and site contouring
1 2 REGULATORY REQUIREMENTS
A Conform to applicable code for disposal of debris
B. Coordinate clearing Work with utility companies.
PART 2 PRODUCTS
Not Used.
PART 3 EXECUTION
3 1 PROTECTION
A Identify and protect utilities from damage.
B. Protect trees, plant growth, and features designated to
remain as final landscaping Identify and tag.
C. Verify that survey benchmark and intended elevations for the
Work are as indicated
3 2 CLEARING
A Clear areas required for access to site and execution of
Work to a minimum depth of 6 inches
B. Remove trees and shrubs. Remove stumps
3.3 ROUGH GRADING
A. Identify required lines, levels, contours, and datum.
B Identify known underground, above ground, and aerial
utilities. Stake and flag locations
C. Notify utility company to remove and relocate utilities
3.4 CLEAN UP
A. Remove debris, rock, and extracted plant life from site.
END OF SECTION

EARTHWORK Page 02200 -1
SECTION 02200
EARTHWORK
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Site grading, removal of topsoil and subsoil, excavating,
backfilling, and compacting
PART 2 PRODUCTS
2.1 SOIL MATERIALS
A. Topsoil: Reusable excavated friable loam, free of subsoil,
roots, grass, excessive amount of weeds, large stone, and
foreign matter. Unless otherwise specified, shall mean the
top 6" of the soil profile.
B. Subsoil: Inorganic soil under the topsoil layer, graded
free of lumps larger than 6 inches, rocks larger than 3
inches, and debris.
2.2 FILL MATERIALS
A. Aggregates, Rip Raps, Select Materials and Borrow Materials
shall meet the Type and Class specified on the Drawings and
per NC DOT Standard Specifications for Roads and Structures
Only natural stone material may be used unless prior written
approval is granted by the Engineer
2 3 ACCESSORIES
A. Engineering Fabric shall meet the Type and Class specified
on the Drawings and per NC DOT Standard Specifications for
Roads and Structures
PART 3 EXECUTION
3.1 EXAMINATION AND PREPARATION
A. Identify required lines, levels, contours, and datum
B. Notify Engineer of unexpected subsurface conditions and
discontinue affected work in area until notified to resume
work
C. Identify and flag known utility locations Notify utility
company to remove and relocate utilities
D. Maintain and protect existing utilities to remain.

Page 02200 -2 EARTHWORK
3 2 PROTECTION OF ADJACENT WORK
A Maximum additional fill height of 4 feet over the existing
sanitary sewer.
3.3 BACKFILLING
A. Backfill areas to contours and elevations. Use unfrozen and
unsaturated materials.
B. Backfill systematically, as early as possible, to allow
maximum time for natural settlement. Do not backfill over
porous, wet, frozen, or spongy subgrade surfaces.
C. Place and compact fill materials in continuous layers not
exceeding 12 inches depth.
D. Employ a placement method so not to disturb or damage
utilities or Work
3 4 SCARIFY
A. Work soil with a agricultural plow, disk, and rake, followed
by lightly rolling, or other equivalent operations, to
uncompact soil, break up clumps, and develop a dense,
uncompacted soil profile
END OF SECTION

SITE DRAINAGE AND SEWERAGE PIPING Page 02725 -1
SECTION 02725
SITE DRAINAGE AND SEWERAGE PIPING
PART 1 GENERAL
1.1 SECTION INCLUDES
A Storm drainage piping, manholes, fittings and accessories.
PART 2 PRODUCTS
2.1 MANHOLES
A. Lid, Frame and Cone Top Section: Reuse existing.
B. Shaft Extension: Extend shaft with reinforced precast sections
if available, otherwise cast -in -place new section.
2.2 Corrugated Metal Pipe
A. Aluminized Type 2 pipe by Contech, 54" diameter, 5" x 1"
corrugations, 16 gauge, lock seam construction Contact Chris
Beaty 854 -2177 (Greensboro).
B. End covers fabricated by pipe manufacturer of like materials.
- PART 3 EXECUTION
3.1 EXAMINATION AND PREPARATION
A. Verify that excavations are ready to receive work.
3.2 INSTALLATION - PIPE
A. Install pipe, fittings, and accessories in accordance with
i manufacturer's instructions.
B. Pipe bed and sides to be coarse aggregate at creek bed, subsoil
under fill.
C Lay pipe to slope gradients indicated
D. Compact soil or aggregate in 8" lifts around pipe Do not
displace or damage pipe when compacting
3 3 INSTALLATION - MANHOLES
A. Remove frame, cover, and top cone for reuse
B Install shaft and top cone Mount lid and frame level in grout,
secure to top cone section to elevation indicated.
END OF SECTION

LANDSCAPING Page 02905 -1
SECTION 02905
LANDSCAPING
PART 1 GENERAL
1 1 SECTION INCLUDES
A. Placement of temporary seeding, lime and fertilizer
PART 2 PRODUCTS
2 1 GRASS AND LEGUMES
A. Select one type and application rate: German millet at 40
lbs per acre, or small- stemmed Sudangrass at 50 lbs. per acre.
2 2 SOIL MODIFICATION MATERIALS
A. Fertilizer. N -P -K of 10- 10 -10.
B Lime. Any type with a guaranteed analysis of effective
neutralizing value.
2 3 MULCH
A Wheat straw or other similar locally available biodegradable
material.
PART 3 EXECUTION
3.1 SCHEDULE
A Seeding dates are May 1 to August 15.
3.2 LIME AND FERTILIZER
A Apply lime at a full rate of 1 ton effective neutralizing
value per acre.
B Apply fertilizer at a full rate of 750 pounds per acre.
3.3 SEEDING
A. Apply seed at a rate stated above and evenly in two
intersecting directions
B. Immediately following seeding, apply wheat straw mulch at a
rate of 2 tons per acre.
C. Anchor mulch using an agricultural disk set nearly straight
and run parallel with the contour.
END OF SECTION

APPENDIX C
Checklist
Patterson Avenue Site, Tax Lots 32A, 32B, 21B, And 2 1 A (Portion) April 28, 1998
Grading, Erosion and Sedimentation Control Plan Page C

STArt
STATE OF NORTH CAROLINA
Department of Environment, Health and Natural Resources,
Land Quality Section
EROSION AND SEDIMENTATION CONTROL PLAN CHECKLIST
The following dam should be Incorporated with respect to specific site conditions, in an erosion and sedimentation control plan
LOCATION INFORMATION
Project location
Roads, streets
North arrow
Scale
Adjoining lakes, streams or other major drainage ways
GENERAL SITE FEATURES
North Arrow
Scale
Property line
Legend
Existing contours
Proposed contours
Limit and acreage of disturbed area
Planned existing buildings location and elevations
Planned and existing roads location and elevations
Lot and/or budding numbers
Land use of surrounding areas
Rods outcrops
Seeps or springs
Wetland limits
Easements
Streams lakes, ponds, drainage ways dams
Boundaries of the total tract
Borrow and/or waste areas (Note - when the person
financially for the overall project is not the person financially
responsible for off -stie borrow ares not regulated by the
provisions of the Mining Act of 1971 and off site waste
areas other than land fills regulated by the Department
of Human Resources such areas should be considered
separate land disturbing activities subject to the
Sedimentation Pollution Control Act of 1973 Off site
borrow areas are subject to the requirements of the
Mining Act of 1971)
Stockpiled topsoil or subsoil location
Street profiles
SITE DRAINAGE FEATURES
Existing and planned drainage patterns (include off -site
areas that drain through project)
Size of Areas (Acreage)
Size of location of culverts and sewers
Soils information (type, special characteristics)
Design calculations for peak discharges of runoff (including
the construction phase and final runoff coefficients of
the site)
Design calculations and construction details for culverts
and storm sewers
Design calculations cross sections and method of
stabilization of existing and planned channels (Include
temporary linings)
Design calculations and construction details of energy
dissipators below culverts and strom sewer outlets
(for np-rap aprons, Include stone sizes (diameters) and
apron dimensions)
Sal Information below culvert and stone sewer outlets
Design calculations and construction details to control
groundwater, i e seeps, high water table, ect
Name of receiving watercourse or name of municipal
operator (only where stromwater discharges are to occur)
EROSION CONTROL MEASURES
Legend
Location of temporary and permanent measures
Construction drawings and details for temporary and
permanent measures
Design calculations for sediment basins and other measures
Maintenance requirements during construction
Person responsible for maintenance during construction
Maintenance requirements and responsible person(s) of
permanent measures
VEGETATIVE STABILIZATION
Areas and acreage to be vegetatively stabilized
Planned vegetation with detals of plants, seed, mulch
and fertilizer
Specifications for permanent and temporary vegetation
Method of sal preparation
NOTE Should Include provisions for ground cover on exposed slopes
within 30 working days following completion of any phase of
grading permanent ground cover for all disturbed areas within
30 working days or 120 calendar days (whichever is shorter)
following completion of construction or development
OTHER REQUIREMENTS
Narrative describing construction sequence (as needed)
Narrative describing the nature and purpose of the
construction activity
Completed Financial Responsibility/Ownership Form (to be
signed by person financially responsible for project)
Bid specifications regarding erosion control
Construction sequence related to sedimentation and erosion
control (Include installation of critical measures prior to
Initiation of the land -disturbing activity and removal of
measures after areas they serve have been permanently
stablized
Rev 12,,93 7.53