14510_Skimmer_Basin_Calcs 4-18-22

DESIGN CALCULATIONS
FOR
SKIMMER BASIN DESIGN
2022 MINE PERMIT MODIFICATION
PINEVILLE QUARRY
VULCAN CONSTRUCTION MATERIALS, LLC
MECKLENBURG COUNTY, NC
PROJECT NO. 14510
April 18, 2022
alley, williams, carmen, & king, inc.
CONSULTING ENGINEERS
FIRM LICENSE No. F-0203
120 SOUTH MAIN STREET P. O. BOX 1248
KANNAPOLIS, NC 28082 704/938-1515
�-SS/o'
SEAL =
16883
DOCUSigned by:
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alley, williams, carmen, & king, inc. 2022 MINE PERMIT MODIFICATION REV. No. DESCRIPTION DATE INITIAL SCALE mm. 4-18-22 JOB MO. 14510
CONSULTING ENGINEERS PINEVILLE QUARRY PIMk 1• = 100 DRW BY-. Rcc SKIMMER BASIN SNEErMD.
FIRM LICENSE No. F-0203 VULCAN CONSTRUCTION MATERIALS LLC Imo., PROFlLE GWW DRAINAGE AREA MAP
120 SOUTH MAIN KANNAPOUS, NC STREET82 704/938-1515 MECKLENBURG COUNTY, NORTH CAROLINA wR_ "° OF: 1

SKIMMER BASINS WITH EFFICIENCY DESIGN
VMC-PINEVILLE QUARRY RCC
14510 4/15/2022
REQUIRED
DESIGN
REQUIRED
SURFACE
SEDIMENT
CLEANOUT
SEDIMENT
SURFACE
AREA
STORAGE
AREA
DEPTH
FREEBOARD
BASIN BOTTOM
DEPTH
STORAGE
SURFACE AREA DIMENSIONS
AREA
ACRES
(FT')
(FT2)
(FT)
(FT)
DIMENSIONS
(FT)
(FT')
(FT)
(FT2)
a
w
w
O
�?
SPILLWAY
o
0
o
j
F
Z
Q
C
110 (IN/HR)
o
LENGTH (FT)
>
z
U)
K
>
J
J
W
L
_
O
0
(J
SKB 22-1
2.5
2.5
0.5
6.4
8.0
8.0
1 4,500.0
2,600.0
2.0
1.5
35.0
55.0
1.2 4,634.0
43.0
63.0
2,709.0
STORAGE AREA
CLEANOUT
DEPTH
SEDIMENT
STORAGE
SURFACE
AREA
W1 L1 D1 W2 L2 D2 W3 L3
D3
(FT)
A2
SKB 22-1 35.0 55.0 2.0 43.0 63.0 3.5 49.0 69.0
1.2
4,634.0
2,709.0
L1 = BASIN LENGTH AT THE BOTTOM OF THE BASIN
W1 = BASIN WIDTH AT THE BOTTOM OF THE BASIN
L2 = BASIN LENGTH AT THE TOP OF THE SEDIMENT STORAGE
W2 = BASIN WIDTH AT THE TOP OF THE SEDIMENT STORAGE
L3 = BASIN LENGTH AT THE TOP OF THE EMBANKMENT
W3 = BASIN WIDTH AT THE TOP OF THE EMBANKMENT
D1 = THE DEPTH OF SEDIMENT STORAGE
D2 = THE OVERALL DEPTH OF THE SEDIMENT BASIN
D3 = THE CLEANOUT DEPTH OF SEDIMENT
A2 = SURFACE AREA AT THE TOP OF THE SEDIMENT STORAGE
DESIGN NOTES:
REQUIRED SEDIMENT STORAGE VOLUME = 1800 CF PER DISTURBED ACRE
REQUIRED SURFACE AREA FOR EFFICIENCY = 325*Q10
THE SPILLWAY LENGTH IS BASED ON THE STANDARD IN THE EROSION CONTROL MANUAL
CLEANOUT DEPTH = 60 % OF THE DESIGN STORAGE
SEDIMENT VOLUME CALCULATIONS ASSUME 2:1 SLOPES IN THE BASIN
NOTE: SEDIMENT VOLUME CALCULATIONS ASSUME 2:1 SLOPES IN THE BASIN
BLUE = DESIGN INPUT
RED = CALCULATED VALUES
MAGENTA= VALUES NEEDING EVALUATION

FAIRCLOTH SKIMMER CALCULATIONS
Job Name:
VMC Pineville
14510
Job Description:
2022 Mine Permit Modification
RCC
Job Location:
Pineville, NC
1/11/2022
SEDIMENT
BASIN
FAIRCLOTH
HEAD
TARGET
TARGET
TARGET
TARGET
ACTUAL
ACTUAL
ACTUAL
ACTUAL
BASIN
DESIGN
SKIMMER
ABOVE
DEWATER
ORIFICE
ORIFICE
ORIFICE
ORIFICE
ORIFICE
ORIFICE
DEWATER
ID
VOLUME
SIZE USED
ORIFICE
TIME
FLOW
AREA
DIA.
DIA.
AREA
FLOW
TIME
(cf)
(in)
(in)
(hr)
(cfs)
(in2)
(in)
(in)
(in2)
(cfs)
(hr)
SKB 22-1
4,634.0
1.5
1.5
72
0.0179
1.5379
1.40
1.50
1.7671
0.0205
62.7
Notes:
1. Design calculations are based on the orifice equation Q = CA(2gh)"`, where C = 0.59
2. Design head is based on the Faircloth Skimmer design standards