20211129_ADI_Received

� I I Anderson Engineering & Assoc., P.A.
P.O. Box 1736
305 North Chippewa
Lumberton, NC 28359
Licensure No.: C-0793
November 17, 2021
Division of Energy, Mineral, & Land Resources
Department of Environmental Quality
Attn: Adam Parr
1612 Mail Service Center
Raleigh, NC 27699-1612
Ref: Whitehall Road Mine, Whiteville, NC
Columbus County
Dear Mr. Parr,
Larrx Anderson, P.E.
President
REGEIVE®
NOV 29 2021
LAND QUALITY SECTION
Please find enclosed two copies of the revised plans and calculations for the above -referenced
project for your continued review and approval:
1 have addressed the review comments as shown on the plans and described below.
1. Please provide proof that the dewatering basin size meets the needs of dewatering. The
proposed withdrawal rate of 96,000 gpd doesn't appear to match the dewatering basin
calculation in the plan.
The basin size was changed and the calculation was modified to accommodate the 96,000
gpd rate. Due to the change in pond size the affected acreage calculation changed as well.
The new affected acreage is shown on the Sheet C101 in a revision cloud.
2. Please clearly indicate and label on the map the mine permit boundary and the mine
excavation boundary. The lines on the maps provided are difficult to see and should be
shown more clearly.
The boundary lines have been made bolder and more distinguishable from each other. Also,
the contour lines have been changed to five foot increments to increase the readability.
3. Please clarify the Erosion and Sediment control (E&SC) measures to be used along the haul
road. Cross-section B-B on sheet C102 appears to show that runoff from the western edge
of the road will flow to the existing ditch outside of the permit boundary. If the existing
ditch is to be used it must be included in the mine permit boundary.
The haul road cross-section B-B has been changed so that the runoff from the road will flow
into the pond.
National Society of
Professional Engineers-
NSPE Licensed Member
Phone: [phone] • Fax: [phone] • E-mail: [e-mail]

NCDEQ-DEMLR
Whitehall Road Mine
November 17, 2021
Page 2
4. Please clarify any E&SC measures to be used for the existing ditch to ensure there is no
offsite sedimentation.
The runoff from the haul road will not flow to the existing ditch; therefore, there will not be
any offsite sedimentation and E&SC measures are not necessary for the existing ditch.
Should you have any questions or need additional information, please feel free to contact me.
Sincerely,
ANDERSON ENGINEERING & ASSOCIATES, P.A.
Renee Taylor
Engineering Technician
Enclosures

STORMWATER RETENTION CALCULATIONS
Project: RUFUS YOUNG CONSTRUCTION, INC Job #: 40-1832 i �r
By: RT Date: 9/23/2021 �� ?
Revision 11/17/2021 0 -�
STAGE -STORAGE FUNCTION (ABOVE PERMANENT POOL)
S Z
CONTOUR ACCUM.
CONTOUR AREA [NCR. VOL. VOL. STAGE In S In Z Z eat
119.00
0
0
0.0
120.00
3,901.19
1,951
1,951
1.0
7.5759
0.0000
1.03
121.00
4.735.33
2,879
4,829
2.0
8.4825
0.6931
1.87
122.00
5,641.46
5,188
10,018
3.0
9.2121
1.0986
3.04
122.50
6,121.53
2,941
12,959
3.5
9.4695
1.2528
3.60
Constant (y-Intercept)
Slope (X Coefficient)
Standard Error of Coefficient
RZ =
9.6000
9.4000
9.2000
,1.0000
8.8000
8.6000
8.4000
0.0000
7.53340 Ks =
1.51301 b =
0.08265
0.99369
STAGE -STORAGE FUNCTION
log -log plot
0.5000 1.0000 1.500
In Z
DEWATERING BASIN SIZING
QP = 400 gpm OR 0.89
T = 4 hr
V= 12832.48 cf
Time to Peak. T.,:
1.39 •Q�
Tp= 172.6 min
cfs
1869
1.510
SEAL
13325 Z CP
:�9 • p;
�C :
tSeries'! RECEIVED
�IOVa h
QUALITY SECTION
STORAGE VOLUME DRAWDOWN TIME
Number of orifices =
1
CD=
0.6
D=
6
in
A =
0.20
sf
g =
32.2
fVsec2
ElevatlonOVERFLOW -
122.50
ElevationiNVERT =
119.00
Ho =
3.50
Hd3 =
1.17
Q =
0.89
cfs
TemporaryPOOIVOLUME =
10184
cf
TImeDEWATERiNG =
3.17
hours
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ROUTING RESULTS
100 200
300 400
500 600
700 800 900 1000
Time [min]
-*--INFLOW [cfs]
-i--TOTAL OUTFLOW [Cfs]
--t-PRINCIPAL SPILLWAY [cfs]
-04-LOW-FLOW ORIFICE [Cis]