20230914_ADI_Received

CAROLINA GEOLOGICAL SERVICES, INC
September 11, 2023
Mr.Adam Parr, PE
NCDEQ — DEMLR
1612 Mail Service Center
Raleigh, NC 27699
nEMLR
Subject: TYB Stella Mine, Carteret County
Dear Mr. Parr;
I am writing on behalf of Mr.Andrew Barber, The Yard Barber, Inc., in response to your letter
of September 1, 2023, requesting additional information on the above referenced Mining Permit
Application. I will respond to each item in your letter in order, for clarity;
1. The size of the dewatering basin will conform to the specifications given on the NC
Department of Transportation detail, recently provided by your office. As this site is not
yet in operation, it is not yet known what size the pump will be. The basin is sized
according to the projected volume of the pump, and the pump requirements will not be
known until the site is in operation. The sizing specifications are attached to this letter.
It is anticipated that the volume of the pump will be at least 1,000 GPM, and therefore
the basin will be at least 52 feet by 104 feet by 3 feet deep.
2. Please find attached a Certified Mail Receipt for Adjoining Property Notification sent to
United States of America, Camp LeJune Railroad.
3. Please find attached a copy of the NPDES NOI for General Permit NCG020.
4. The buffer between the Mining Area and the Permit Boundary has been more clearly
defined on the Mine Map. The Existing vegetation on the site effectively shields the site
from view. In areas where the existing vegetation is thinner, a vegetated visual barrier
berm will be built near the perimeter of the permitted area to better shield the operation
from adjoining property. The area between the visual barrier berm and the mining area
will be undisturbed other than clearing necessary for construction of the visual barrier
berms and will not be used for any mining activity such as stockpiling or processing. A
maintenance shop has been added to the plan, as well as a small shed adjacent to the
access road. The Disturbed Acreage chart has been updated to reflect the addition of
the berms and other disturbed areas.
We trust that this information will assist you in completing your review of the Mining Permit
Application. If you need any additional information, please contact me.
Sincerely,
James C. Izze(�Jr., PG
enclosures
PO Box 429, GARNER, NC 27529 [phone]

Dewatering Basin Design items in red a,�i ij,,;._"
Version 2.27.09
The volume of the borrow pit dewatering basin will be based on a 2 hour retention time. Using
the formula V= 8.0203 * Q * It where, V is volume in cubic feet, Q is the pump rate in gallons per
minute (GPM), and It is the retention time in hours.The pump rate is not to exceed 1,000 GPM
60 000 GPH .
STEP 1: Input required variables The volume of the borrow pit dewatering
basin will be based on a 2 hour retention
Pump Rate: GPM time. The pump rate shall not exceed
Retention Time: hours 1,000 GPM (60,000 GPH). The contractor
may desire a greater retention time for
Required Volume: 16040.E W managing turbidity; however, work
associated with this increased volume will
be considered incidental.
STEP 2: Design of the Dewatering Basin
Final Required Volume: 16040.E W
Design Depth: not to exceed 3 feet
Proposed Basin Side Slopes: 1.5 :1 side slopes 'must be at least 1.5:1 or flatter
OPTIONS
2:1 (L:W) 3:1 (L:W)
Suggested Top Width (ft): 52 43 RECENED
Suggested Top Length (ft): 104 129
Final Design Top Width (ft): 56 46 i
Final Design Top Length (ft): 112 138
Final Design Depth (ft): 3 3 LAND QUALITY
Verify Storage(W) 16629.00 16641.00 MINING PROGRAM
OK OK
The dewatering basin shall be designed in accordance with the Borrow Pit
Dewatering Basin Detail Drawing.
Comments:
RECEIVED
SEP 14 W
LAND QUALITY
MINING PROGRAM

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