20210709_Eros_Sedm_Cont-Mod_92-13

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-01G N
JUNE 2021 -.•
- 041595
.92 f06.29.21 ; v
© PAP
Draper Aden Associates
Cngincerin4 • Sur%e%ing ♦ I.m ironmental Sen ice,
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 north and southwest.
• Planned for a new retention pond (#4) which will replace #2 and #3.

SEDIMENT BASIN SB 21
(Riser and Barrel)
Project:
Hanson Aggregates
Holly Springs Quarry
�`in—Jr, Drap
F.ner Aden Associates
R Sun -eying • EnWivnmenra( Servk e,
Project #:
R14315N-01G
Date:
Janua 1, 2020
By:By:J
APM
Basin Sizing Area = 13.67 ac
Drainage basin 21 C= 0.4
10-year runoff, Q10: 40.63 113/sec
Disturbed area: 13.67 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 13.67 =
24,606 W
Surface area required = 325 fe per ft3/sec 010
=325 X 40.62724 =
13,204 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 it
Surface area =
22,245 W
Bottom area =
15025 ft`
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 it
Riser Capacity @ 1.0 it head =
55.88 ft3/sec
Barrel Diameter:
24 in
Barrel Area, A =
3.142 ft'
Wetted Perimeter =
6.283 it
Hydraulic Radius, R =
0.50 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxexS12`:
11.04 ft/sec
Barrel Capcity =
69.34 ft3/sec
Principal Spillway Capacity =
55.88 ft3/sec
Required Capacity=
44,89
Conclusion ADEQUATE
10 yr i= 7.43
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: it Wit 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 tuft
Velocity, V=1.49/nxR2"xS12:
0.00 ft/sec
Emergency Spillway Capacity=VxA:
0.00 113/sec
Required Capacity, 025:
44.89 W/sec

SEDIMENT BASIN SB 22
(SKIMMER SEDIMENT BASIN)
Project:
Hanson Aggregates
Holly Springs Quarry�`
Draper Aden Associates
Project#:
R14315N-01G
,,,/7 Engineering Survevin
V X X ' X ' Envimnmenml Sen iec,
Date:
January 1 2020
By:By:J
APM
Basin Sizing Area = 9.68 ac
Drainage basin 22 C= 0.4
10-year runoff, Q10: 28.77 ft3/sec
Disturbed area: 9,68 acres
Volume required = 1800 ft' per acre disturbed area
=1800 X 9.68 =
17,424 ft'
Surface area required = 325 fe per ft3/sec Qra
=325 X 28.76896 =
9,350 ft'
Basin is Irregular
10 yr i= 7.43
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 ft
Surface length:
147 ft
Surface area =
13,626 W ADEQUATE
Bottom area =
5237 W
Ponding volume =
24,287 ft' 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 It head =
41.91 ft3/sec
Barrel Diameter:
18 in
Barrel Area, A =
1.767 ft'
Wetted Perimeter =
4.712 it
Hydraulic Radius, R =
0.38 it
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxRmxS"2-:
9.10 ft/sec
Barrel Capcity =
32.17 ft3/sec
Principal Spillway Capacity =
32.17 ft3/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 S rin s Quarry
�` Draper Aden Associates
Project #:
R14315N-01 G
�j Eggineering • Surnrring • Environmenrol Se"kve
V
Date:
January1, 2020
By:
APM
Basin Sizing Area = 8.22 ac
Drainage basin 23 C= 0.4
10-year runoff, 0,0: 24.43 ft3/sec
Disturbed area: 8.22 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 8.22 =
14,796 ft3
Surface area required = 325 ft' per ft3/sec Q,0
=325 X 24.42984 =
7,940 ft`
Basin geometry.
220x15
Surface elevation:
332
Bottom elevation:
329
Ponding depth:
3 ft
Side slope ratio:
3 h : 1 v
Surface width:
31 ft
Surface length:
227 ft
Surface area =
8,014 W ADEQUATE
Bottom area = 5032 ft`
Ponding volume = 17,445 ft3 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 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 ft
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 Wit
Velocity, V=1.49/nxR"'xS12-:
9.10 ft/sec
Barrel Capcity =
32.17 113/sec
Principal Spillway Capacity =
32.17 113/sec
Required Capacity--
26.99
Conclusion ADEQUATE
10 yri= 7.43
25 yr i= 8.21
25-year runoff, 025:
Skimmer Sizing
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
26.99 ft3/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 Draper Aden Associates
Project#: R14315N-01G �/�j Engineering • Surveying • ErrrimnmemalSenire,
Date: January 1, 2020
B : APM
Basin Sizing Area = 8.49 ac
Drainage basin 24 C= 0.4
10-year runoff, Q,o: 25.23 tt3/sec
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 ft3/sec Q10
=325 X 25.23228 =
8,200 ttr
Basin is Irregular.
Surface elevation:
299
Bottom elevation:
297
Ponding depth:
2 It
Side slope ratio:
2 h : 1 v
Surface width: na
ft
Surface length: na
ft
Surface area =
19,292 ft` ADEQUATE
Bottom area =
8393 V
Ponding volume = 33,297 113 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 it
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 it
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxRmxS72-:
9.10 ft/sec
Barrel Capcity =
32.17 ft3/sec
Principal Spillway Capacity =
32.17 ft3/sec
Required Capacity=
27.88
Conclusion ADEQUATE
10 yr i= 7.43
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 We
2.5 in
5080
3.008 in
1.96 in
Ur

SEDIMENT BASIN SB 25
(SKIMMER SEDIMENT BASIN)
Project:
Hanson Aggregates
Holly Springs Quarryp
�' Dra er Aden Associates
Project #:I
R14315N-01 G
.� Engineering • Sanvi-ing Enrironmenla! Serrire,
Date:
January 1, 2020
By]
APM
Basin Sizing Area = 4.54 ac
10 yr i= 7.43
Drainage basin 25 C= 0.4
25 yr i= 8.21
10-year runoff, Q,o: 13.49 ft3/sec
25-year runoff, Q25:
Disturbed area: 4.54 acres
Volume required = 1800 113 per acre disturbed area
=1800 X 4.54 =
8,172 ft3
Surface area required = 325 ft' per ft3/sec Q10
=325 X 13.49288 =
4,385 ft`
Basin is Irregular.
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 W ADEQUATE
Bottom area = 3828 W
Ponding volume = 9,040 W ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Maximum water volume:
Risers & barrels, C.M.P.
Max. Dewatering Time:
Basin Bottom Elevation: 307.0
Minimum Skimmer Size:
Principal Spillway Crest Elevation 309.0
Factor to drain in 4 days:
Riser Diameter: 18 in
Orifice area =
Riser Circumference = 5 ft
Orifice diameter =
Riser Capacity @ 1.0 ft head = 20.95 ft'/sec
Barrel Diameter: 15 in
Barrel Area, A = 1.227 ft'
Wetted Perimeter = 3.927 ft
Hydraulic Radius, R = 0.31 It
Roughness Coefficient, n: 0.012
Barrel Slope, S: 0.020 Wit
Velocity, V=1.49/nxRmxS'/'": 8.06 ft/sec
Barrel Capcity = 19.77 ft3/sec
Principal Spillway Capacity = 19.77 ft?/sec
Required Capacity= 14.91
Conclusion ADEQUATE
14.91 ft3/sec
8,172 ft3
120 hrs
2 in
4492
1.819 in
1.52 in
Ur

SEDIMENT BASIN SB 26
(Riser & Barrel)
Project:
Hanson Aggregates
Holly Springs Quarry
raper Aden Associates
Project #J
R14315N-01 G
Q Engineering • Swveying • Emlmnmenlal Service,
DateJ
January 1, 2020
B :
APM
Basin Sizing Area = 22.49 ac
10 yr i= 7.43
Drainage basin 26 C= 0.4
25 yr i= 8.21
10-year runoff, Q1e: 66.84 ft3/sec
25-year runoff, Q25: 73.86
ft3/sec
Disturbed area: 22.49 acres
Volume required = 1800 ft' per acre disturbed area
=1800 X 22.49 =
40,482 ft'
Surface area required = 325 ft3 per ft3/sec 0,0
=325 X 66.84028 =
21,723 ft`
Skimmer Sizing
Basin is Irregular.
Surface elevation: 299
Maximum water volume:
40,482 ft3
Bottom elevation: 297
Max. Dewatering Time:
120 hrs
Ponding depth: 2 ft
Minimum Skimmer Size:
3 in
Side slope ratio: 3 h : 1 v
Factor to drain in 4 days:
5528
Surface width: 72 ft
Orifice area =
7.323 in`
Surface length: 147 ft
Orifice diameter =
3.05 in
Surface area = 25,231 ft` ADEQUATE
Bottom area = 17132 W
Ponding volume = 42,363 ft3 ADEQUATE
Principal Spillway
Trapezoidal channel
Risers & barrels, C.M.P.
Emergency Spillway Crest Elev.:
300.0
Basin Bottom Elevation: 297.0
Emergency Spillway Width:
5.0 ft
Principal Spillway Crest Elevation 299.0
Side Slope Ratio:
3.0 ft h/ft v
Riser Diameter: 60 in
Riser Circumference = 16 ft
Riser Capacity @ 1.0 ft head = 69.85 ft3/sec
Water Depth:
0.50 ft
Barrel Diameter: 36 in
Area, A:
3.25 ft'
Barrel Area, A = 7.069 ft'
Wetted Perimeter:
8.16 ft
Wetted Perimeter = 9.425 ft
Hydraulic Radius, R:
0.398 ft
Hydraulic Radius, R = 0.75 ft
VR:
1.11
Roughness Coefficient, n: 0.012
Roughness Coefficient, n:
0.050 RipRap
Barrel Slope, S: 0.020 ft/ft
Slope, S:
0.030 ft/ft
Velocity, V=1.49/nxRmxS1 ": 14.48 ft/sec
Velocity, V=1.49/nxR23xS12:
2.78 ft/sec:
Barrel Capcity = 204.73 ft3/sec Emergency Spillway Capacity=VXA:
9.05 ft3/sec
Principal Spillway Capacity = 69.85 ft'/sec
Required Capacity, Q35:
4.01 ft'/sec
Required Capacity= 73.86
Conclusion
ADEQUATE
Conclusion SPILLWAY
Ur

SEDIMENT BASIN SB 27
(SKIMMER SEDIMENT BASIN)
Project:
Hanson Aggregates
Holly Springs Quarry
raper Aden Associates
Pro'ect #71
R14315N-01G
„tj Fngineering • Suneving, • Emdronmenm/Semieex
Date:1
January 1 2020
By: I
APM
Basin Sizing Area = 3.09 ac
Drainage basin 27 C= 0.4
10-year runoff, Qio: 9.18 ft3/sec
Disturbed area: 3.09 acres
Volume required =1800 ft3 per acre disturbed area
=1800 X 3.09 =
5,562 ft3
Surface area required = 325 ft' per ft3/sec Q10
=325 X 9.18348 =
2,985 ft`
Basin is Irregular
10 yr i= 7.43
25 yr i= 8.21
25-year runoff, Q25:
Surface elevation:
339
Bottom elevation:
337
Ponding depth:
2 ft
Side slope ratio:
2 h : 1 v
Surface width:
72 ft
Surface length:
147 ft
Surface area =
8,671 W ADEQUATE
Bottom area =
6495 W
Ponding volume =
15,166 ft3 ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Risers & barrels, C.M.P
Basin Bottom Elevation:
337.0
Principal Spillway Crest Elevation
339.0
Riser Diameter:
18 in
Riser Circumference =
5 ft
Riser Capacity @ 1.0 it head =
20.95 ft3/sec
Barrel Diameter:
15 in
Barrel Area, A =
1.227 fe
Wetted Perimeter=
3.927 ft
Hydraulic Radius, R =
0.31 it
Roughness Coefficient, n:
0.012
Barrel Slope, S:
0.020 ft/ft
Velocity, V=1.49/nxFtmxS12-:
8.06 ft/sec
Barrel Capcity =
19.77 ft3/sec
Principal Spillway Capacity =
19.77 ft3/sec
Required Capacity=
10.15
Conclusion ADEQUATE
Maximum water volume:
Max. Dewatering Time:
Minimum Skimmer Size:
Factor to drain in 4 days:
Orifice area =
Orifice diameter =
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 Quarry
Draper Aden Associates
Project #:
R14315N-01 G
Q Engineering • Sun -eying • Environmenrol Services
Date:
Janua 1 2020
By:
APM
Basin Sizing Area = 8.81 ac
10 yr i= 7.43
Drainage basin 27 C= 0.4
25 yr i= 8.21
10-year runoff, Q10: 26.18 ft3/sec
25-year runoff, 025:
Disturbed area: 8.81 acres
Volume required = 1800 ft3 per acre disturbed area
=1800 X 8.81 =
15,858 W
Surface area required = 325 fe per ft3/sec 010
=325 X 26.18332 =
8,510 W
Basin is Irregular.
Surface elevation: 317
Bottom elevation: 315
Ponding depth: 2 ft
Side slope ratio: 3 h : 1 v
Surface width: 72 ft
Surface length: 147 ft
Surface area = 13,016 W ADEQUATE
Bottom area = 5981 ft`
Ponding volume = 18,989 ft3 ADEQUATE
Spillway Design
Skimmer Sizing
Principal Spillway
Maximum water volume:
Risers & barrels, C.M.P.
Max. Dewatering Time:
Basin Bottom Elevation: 315.0
Minimum Skimmer Size:
Principal Spillway Crest Elevation 317.0
Factor to drain in 4 days:
Riser Diameter: 36 in
Orifice area =
Riser Circumference = 9 ft
Orifice diameter =
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 ft
Roughness Coefficient,n: 0.012
Barrel Slope, S: 0.020 ft/ft
Velocity, V=1.49/nxFl"xS1'-: 9.10 ft/sec
Barrel Capcity = 32.17 ft3/sec
Principal Spillway Capacity = 32.17 ft3/sec
Required Capacity= 28.93
Conclusion ADEQUATE
28.93 ft'/sec
15,858 ft3
120 hrs
2.5 in
5080
3.122 in
1.99 in
Ur