20220308_ESC_Calculations

EROSION & SEDIMENT CONTROL
MODIFICATIONS
HOLLY SPRINGS QUARRY
HANSON AGGREGATES, LLC
SOUTH REGION
Mining Permit 92-13
WAKE COUNTY
NORTH CAROLINA
ISSUED BY
DRAPER ADEN ASSOCIATES
Project R14315N-01 G
MARCH 2O21
/ SEAL
041595
'VG IN1
P. t
"a�au�uL
Draper Aden Associates
Engineering • Sur%e)ing ♦ E n%irnnmental Senicec
114 Edinburgh South Drive, Suite 200 — Cary, North Carolina 27511
Phone: [phone] - Fax: [phone] — www.daa.com
License No. F-1429

NARRATIVE
The calculations attached are for erosion and sediment control measures in connections with an
expansion of the existing mining area, additional overburden piles, and associated screening. The
revisions and modifications now shown are as follows:
• Added overburden piles in permit area expansion to the North.
• Expanded the pit limits southeast.

SEDIMENT BASIN SB 21
(Riser and Barrel)
Project: Hanson Aggregates
Holly Springs Quarry Draper Aden Associates
Project #: R14315N-01 G „�j Engineering Snrveving Environmental Servir
Date: Janua 1, 2020 V
By: APM
Basin Sizing Area = 13.67 ac
Drainage basin 21 C= 0.4
Disturbed area: 13.67 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 13.67 =
24,606 ft
Surface area required = 325 ft' per ft3/sec Q25
=325 X 44.89228 =
14,590 ft`
Basin is Irregular
Surface elevation:
337
Bottom elevation:
335
Ponding depth:
2 ft
Side slope ratio:
2 h : 1 v
Surface width:
72 ft
Surface length:
147 ft
Surface area =
22,245 fe
Bottom area =
15025 fe
ADEQUATE
Ponding volume = 37,270 ft' ADEQUATE
Spillway Design
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
335.0
Principal Spillway Crest Elevation
337.0
Riser Diameter:
48 in
Riser Circumference =
13 ft
Riser Capacity @ 1.0 ft head =
55.88 ft3/sec
Barrel Diameter.
24 in
Barrel Area, A =
3A42 ft2
Wetted Perimeter=
6.283 ft
Hydraulic Radius, R =
0.50 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxRmxS'12-:
11.04 ft/sec
Barrel Capcity =
69.34 ft3/sec
Principal Spillway Capacity =
55.88 ft3/sec
Required Capacity--
44.89
Conclusion ADEQUATE
25 yr i= 8.21
25-year runoff, Q25:
Skimmer Sizing
44.89 ft3/Sec
Maximum water volume:
24,606 ft3
Max. Dewatering Time:
120 hrs
Minimum Skimmer Size:
2.5 in
Factor to drain in 4 days:
5080
Orifice area =
4.844 in`
Orifice diameter =
2.48 in
Emergency Spillway not required
Trapezoidal channel
Emergency Spillway Crest Elev.:
Emergency Spillway Width: it
Side Slope Ratio: ft h/ft v
Water Depth:
0.50 It
Area, A:
0.00 ft
Wetted Perimeter:
1.00 It
Hydraulic Radius, R:
0.000 It
VR:
0.00
Roughness Coeffiicient, n:
0.050 RipRap
Slope, S:
0.030 ft/ft
Velocity, V=1.49/nxR23xS'n:
0.00 ft/sec
Emergency Spillway Capacity=VxA:
0.00 ft3/sec
Required Capacity, Q25:
44.89 ft'/sec

SEDIMENT BASIN SB 22
(SKIMMER SEDIMENT BASIN)
Project: Hanson Aggregates
Holly Springs Quarry Draper Aden Associates
Project #: R14315N-01G�j Engineering • Surveying • Envimnmento7 Semicec
Date: January,,
1, 2020 E
By: APM
Basin Sizing Area = 9.68 ac
Drainage basin 22 C= 0.4
Disturbed area: 9.68 acres
Volume required = 1800 W per acre disturbed area
=1800 X 9.68 =
17,424 If
Surface area required = 325 ft2 per ft3/sec Q25
=325 X 31.78912 =
10,331 W
Basin is Irregular
25 yr i= 8.21
25-year runoff, Q25:
Surface elevation:
334
Bottom elevation:
331
Ponding depth:
3 ft
Side slope ratio:
2 h : 1 v
Surface width:
72 it
Surface length:
147 It
Surface area =
13,626 fe ADEQUATE
Bottom area =
5237 W
Ponding volume =
24,287 W ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Risers & barrels, CPP
Basin Bottom Elevation:
331.0
Principal Spillway Crest Elevation
334.0
Riser Diameter.
36 in
Riser Circumference =
9 It
Riser Capacity @ 1.0 ft head =
41.91 ft3/sec
Barrel Diameter:
18 in
Barrel Area, A =
1.767 ft?
Wetted Perimeter=
4.712 ft
Hydraulic Radius, R =
0.38 it
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxR23xS"'
9.10 ft/sec
Barrel Capcity =
32.17 ft?/sec
Principal Spillway Capacity =
32.17 ft?/sec
Required Capacity--
31.79
Conclusion ADEQUATE
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
31.79 ft3/sec
17,424 ft3
120 hrs
2.5 in
5080
3.430 in
2.09 in
Ur

SEDIMENT BASIN SB 23
(SKIMMER SEDIMENT BASIN)
Project: Hanson Aggregates
Holly Springs Quarry Draper Aden Associates
Project #: R14315N-01 G Date: January 1, 2020 �/7 EnX } ineerinX Survein * cr
�/ X • Envimnmenial Sen
By: APM
Basin Sizing Area = 8.22 ac
Drainage basin 23 C= 0.4
Disturbed area: 8.22 acres
Volume required = 1800 ft' per acre disturbed area
=1800 X 8.22 =
14,796 ft'
Surface area required = 325 ft2 per ft3/sec Q25
=325 X 26.99448 =
8,773 le
Basin geometry.
220x15
Surface elevation:
332
Bottom elevation:
329
Ponding depth:
3 ft
Side slope ratio:
3 h : 1 v
Surface width:
31 it
Surface length:
227 it
Surface area =
8,014 ft` TOO SMALL
Bottom area = 5032 ft`
Ponding volume = 17,445 ft' ADEQUATE
Spillway Design
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
329.0
Principal Spillway Crest Elevation
332.0
Riser Diameter:
36 in
Riser Circumference =
9 ft
Riser Capacity @ 1.0 it head =
41.91 113/sec
Barrel Diameter:
18 in
Barrel Area, A =
1.767 ftZ
Wetted Perimeter =
4.712 it
Hydraulic Radius, R =
0.38 it
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 Wit
Velocity, V=1.49/nxR23xS"'
9.10 ft/sec
Barrel Capcity =
32.17 ft/sec
Principal Spillway Capacity =
32.17 ft/sec
Required Capacity--
26.99
Conclusion ADEQUATE
25 yr i= 8.21
25-year runoff, Q25:
Skimmer Sizing
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
26.99 ft /sec
14,796 ft3
120 hrs
2 in
4492
3.294 in'
2.05 in
Ur

SEDIMENT BASIN SB 24
(SKIMMER SEDIMENT BASIN)
Project:
Hanson Aggregates
Holly Springs Quarry
a Draper Aden Associates
Project #:
R14315N-01 G
r /7 Engineering • Snrveving • Envimnmrmrd Senn t •
Date:
January 1, 2020
By:
APM
Basin Sizing Area = 8.49 ac
Drainage basin 24 C= 0.4
Disturbed area: 8.49 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 8.49 =
15,282 ft3
Surface area required = 325 ft3 per ft?/sec Q25
=325 X 27.88116 =
9,061 ft`
Basin is Irregular
Surface elevation:
299
Bottom elevation:
297
Ponding depth:
2 ft
Side slope ratio:
2 h : 1 v
Surface width: na
It
Surface length: na
ft
Surface area =
19,292 W ADEQUATE
Bottom area =
8393 ft`
Ponding volume = 33,297 ft' ADEQUATE
Spillway Design
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
297.0
Principal Spillway Crest Elevation
299.0
Riser Diameter:
36 in
Riser Circumference =
9 ft
Riser Capacity @ 1.0 ft head =
41.91 113/sec
Barrel Diameter.
18 in
Barrel Area, A =
1.767 fe
Wetted Perimeter =
4.712 ft
Hydraulic Radius, R =
0.38 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft1ft
Velocity, V=1.49/nxR213xS"2
9.10 ft/see
Barrel Capcity =
32.17 ft3/sec
Principal Spillway Capacity =
32.17 ft3/sec
Required Capacity=
27.88
Conclusion ADEQUATE
25 yr i= 8.21
25-year runoff, Q25:
Skimmer Sizing
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
27.88 ft3/sec
15,282 ft3
120 hrs
2.5 in
5080
3.008 in
1.96 in
Ur

SEDIMENT BASIN SB 25
(SKIMMER SEDIMENT BASIN)
Project: Hanson Aggregates
Hollv Siorings Qua Allg� Draper Aden Associates
Project #: R14315N-01G ,�tj Engineering Surveying Environmemal Sendre
Date: Janua 1, 2020 /
By: APM
Basin Sizing Area = 4.54 ac
Drainage basin 25 C= 0.4
Disturbed area: 4.54 acres
Volume required = 1800 ft' per acre disturbed area
=1800 X 4.54 =
8,172 ft'
Surface area required = 325 ft3 per ft3/sec Q25
=325 X 14.90936 =
4,846 le
Basin is Irregular
25 yr i= 8.21
25-year runoff, Q25:
Surface elevation:
309
Bottom elevation:
307
Ponding depth:
2 ft
Side slope ratio:
2 h : 1 v
Surface width:
72 ft
Surface length:
147 ft
Surface area =
5,800 ft` ADEQUATE
Bottom area =
3828 W
Ponding volume =
9,040 ft' ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
307.0
Principal Spillway Crest Elevation
309.0
Riser Diameter:
18 in
Riser Circumference =
5 ft
Riser Capacity @ 1.0 ft head =
20.95 ft3/sec
Barrel Diameter:
15 in
Barrel Area, A =
1.227 ft
Wetted Perimeter =
3.927 ft
Hydraulic Radius, R =
0.31 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxR2'xSr2-:
8.06 ft/sec
Barrel Capcity, =
19.77 ft3/sec
Principal Spillway Capacity =
19.77 ft3/sec
Required Capacity--
14.91
Conclusion ADEQUATE
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
14.91 ft3/sec
8,172 0
120 hrs
2 in
4492
1.819 in
1.52 in
Ur

SEDIMENT BASIN SB 26
(Riser & Barrel)
Project: Hanson Aggregates
Holly Springs Quarryp` Draper Aden Associates
Project #: R14315N-01 G Engineering •Surveying Envi ronmenml Services
Date: Janua 1, 2020
By: APM
Basin Sizing Area = 22.49 ac
Drainage basin 26 C= 0.4
Disturbed area: 22.49 acres
Volume required = 1800 fe per acre disturbed area
=1800 X 22.49 =
40,482 W
Surface area required = 325 ft2 per ft?/sec Q25
=325 X 73.85716 =
24,004 fe
Basin is Irregular
Surface elevation:
299
Bottom elevation:
297
Ponding depth:
2 ft
Side slope ratio:
3 h : 1 v
Surface width:
72 ft
Surface length:
147 ft
Surface area =
25,231 ft` ADEQUATE
Bottom area = 17132 ft`
Ponding volume = 42,363 W ADE
Principal Spillway
Risers & barrels, C.M.P.
Basin Bottom Elevation:
297.0
Principal Spillway Crest Elevation
299.0
Riser Diameter:
60 in
Riser Circumference =
16 it
Riser Capacity @ 1.0 ft head =
69.85 ft?/sec
Barrel Diameter:
36 in
Barrel Area, A =
7.069 ft2
Wetted Perimeter=
9.425 ft
Hydraulic Radius, R =
0.75 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxRmxS72-:
14.48 ft/sec
Barrel Capcity =
204.73 ft3/sec
Principal Spillway Capacity =
69.85 ft'/sec
Required Capacity--73.86
Conclusion
SPILLWAY
QUATE
25 yr i= 8.21
25-year runoff, Q25: 73.86 ft/sec
Skimmer Sizing
Maximum water volume:
40,482 ft3
Max. Dewatering Time:
120 hrs
Minimum Skimmer Size:
3 in
Factor to drain in 4 days:
5528
Orifice area =
7.323 in`
Orifice diameter =
3.05 in
Trapezoidal channel
Emergency Spillway Crest Elev.: 300.0
Emergency Spillway Width: 5.0 ft
Side Slope Ratio: 3.0 ft h/ft v
Water Depth:
0.50 ft
Area, A:
3.25 ft2
Wetted Perimeter:
8.16 ft
Hydraulic Radius, R:
0.398 ft
VR:
1.11
Roughness Coeffiicient, n:
0.050 RipRap
Slope, S:
0.030 ft/ft
Velocity, V=1.49/nxR'xS":
2.78 ft/sec
Emergency Spillway Capacity=VxA:
9.05 ft3/sec
Required Capacity, Q25:
4.01 ft°/sec
Conclusion ADEQUATE
Ur

SEDIMENT BASIN SB 27
(SKIMMER SEDIMENT BASIN)
Project: Hanson Aggregates
Holly Springs Quarry Draper Aden Associates
Project #: R14315N-01 G /7 Fngineering • Surveying • Envhwnmeiga1 Sen*,,
Date: January 1, 2020
By: APM
Basin Sizing Area = 3.09 ac
Drainage basin 27 C= 0.4
25 yr i= 8.21
25-year runoff, Q25:
Disturbed area: 3.09 acres
Volume required = 1800 W per acre disturbed area
=1800 X 3.09 =
5,562 W
Surface area required = 325 ft per ft?/sec Q25
=325 X 10.14756 =
3,298 fe
Basin is Irregular.
Surface elevation: 339
Bottom elevation: 337
Ponding depth: 2 ft
Side slope ratio: 2 h : 1 v
Surface width: 72 ft
Surface length: 147 it
Surface area = 8,671 W ADEQUATE
Bottom area = 6495 ft`
Pending volume = 15,166 W ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Maximum water volume:
Risers & barrels, C.M.P.
Max. Dewatering Time:
Basin Bottom Elevation: 337.0
Minimum Skimmer Size:
Principal Spillway Crest Elevation 339.0
Factor to drain in 4 days:
Riser Diameter: 18 in
Orifice area =
Riser Circumference = 5 ft
Orifice diameter =
Riser Capacity @ 1.0 it head = 20.95 ft3/sec
Barrel Diameter: 15 in
Barrel Area, A = 1.227 ft
Wetted Perimeter= 3.927 it
Hydraulic Radius, R = 0.31 it
Roughness Coefficient, n: 0.012
Barrel Slope, S: 0.020 ft/ft
Velocity, V=1.49/nxR2oxS'/2 8.06 ft/sec
Barrel Capcity = 19.77 ft3/sec
Principal Spillway Capacity = 19.77 ft?/sec
Required Capacity-- 10.15
Conclusion ADEQUATE
10.15 ft3/sec
5,562 ft3
120 hrs
1.5 in
3840
1.448 in'
1.36 in
Ur

SEDIMENT BASIN SB 28
(SKIMMER SEDIMENT BASIN)
Project: Hanson Aggregates
Holly Springs Qua ` Draper Aden Associates
Project#: R14315N-01GZ5 Engineering • Sun -eying • EnriynnmenlalSeniccc
Date: January1, 2020 �/
By: APM
Basin Sizing Area = 8.81 ac
Drainage basin 27 C= 0.4
Disturbed area: 8.81 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 8.81 =
15,858 ft3
Surface area required = 325 ftper ft3/sec Q25
=325 X 28.93204 =
9,403 W
Basin is Irregular
25 yr i= 8.21
25-year runoff, Q25:
Surface elevation:
317
Bottom elevation:
315
Ponding depth:
2 ft
Side slope ratio:
3 h : 1 v
Surface width:
72 ft
Surface length:
147 It
Surface area =
13,016 W ADEQUATE
Bottom area =
5981 W
Ponding volume =
18,989 ft3 ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
315.0
Principal Spillway Crest Elevation
317.0
Riser Diameter:
36 in
Riser Circumference =
9 ft
Riser Capacity @ 1.0 it head =
41.91 ft3/sec
Barrel Diameter:
18 in
Barrel Area, A =
1.767 ft'
Wetted Perimeter=
4.712 ft
Hydraulic Radius, R =
0.38 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxR23xS'rz-:
9.10 ft/sec
Barrel Capcity =
32.17 ft3/sec
Principal Spillway Capacity =
32.17 ft3/sec
Required Capacity--
28.93
Conclusion ADEQUATE
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
28.93 ft3/sec
15,858 ft3
120 hrs
2.5 in
5080
3.122 in
1.99 in
Pil