1 - 13-04 ADI Response - AWCK letter

alley, williams , carmen & king , inc .
OKEngineering • Land Surveying Construction Inspection
May 7,2020 11526
Ms. Judy Wehner,Assistant State Mining Specialist
NC DEQ RECEIVED
Division of Land Resources, Land Quality Section
512 North Salisbury Street, 5th Floor JUL 15 2020
Raleigh,North Carolina 27604
LAND QUALITY
Re: Gold Hill Quarry(Permit#13-04)
MINING PROGRAM
Cabarrus/Rowan County
Permit Modification including Property Addition
Dear Ms. Wehner;
Please find 2 copies of the revised plans to address the June 9', 2020 letter. Please find attached the
following items:
• Two copies of the revised plans(Sheets 1 thru 9)
• Two copies of the Corp of Engineers Jurisdictional Determination for the project area.
• Two copies of a screenshot of the Cabarrus County GIS website showing the location of adjacent
property owners on the western side of the site. The names of the landowners have been added to
the map for clarity.
• Two copies of a design calculation for a plunge pool to be located at the end of slope drains.
The plans were revised to address the review comments. The comments are listed below along with the
changes made to the plans.
1. Provide proof, such as copies of the signed return receipts from certified mail that Sparkle Properties
LLC and Jason Hand Rebecca D Cline have been properly notified.
Sparkle Properties LLC does not border the Gold Hill Quarry. A screen print from the Cabarrus
County GIS website is attached showing the location of Sparkle Properties LLC tract and Vulcan
Lands LLC is attached.
A copy of the Cline return receipt is attached.
A copy of the unclaimed notice to the Rinehardt's is also attached.
2. Provide proof that your company has obtained the necessary Certification for the impacts to the
stream.
No stream impacts are proposed. Attached is a copy of the Corp of Engineers Jurisdiction
Determination for the project area. There are no streams within the project area.
120 South Main Street • P.O. Box 1248 • Kan napolis, North Carolina 28082
Tel. -704-938-1515 • Fax-704-938-6810 • awck.com
ESTABLISHED • 1960

Ms.,Judy Wehner,Assistant State Mining Specialist
July 10, 2020
Page 2
3. Provide cross sections for each phase of the Western Storage Area.Label the slopes on the cross
sections. Include a detailed description of the material placement including lift heights and staged
seeding. Provide time frames for temporary and permanent stabilization.
Profile B-B showing the proposed fill associated with Phase 1 has been added to Sheet 8.
The proposed grading for Phase 2 and 3 along with temporary erosion control measures have
been added to Profile A-A on Sheet 8. Notes have been added to reflect the proposed 2:1 grading
on the exterior and temporary slopes.
A Material Storage Cross-Section A-A label has been added to the Phase 2, Phase 3, and Phase 4
grading sheets (Sheets 4, 5, and 6). A Material Storage Cross-Section B-B label has been added
to the Phase I grading sheet (Sheet 3).
The fill placement was split into 4 phases to manage the grading into sections that will all the
quarry to divert the bulk of the drainage area into the pit and provide erosion control measures
for the active disturbed areas. The grading plans and profiles show the proposed heights of each
phase. The intermediate lift heights in each phase will vary with the amount of material
generated by mining activities, which changes yearly based on the economy and material
demand.
The construction sequences for Phase I thru Phase 4 have been revised to include the following
text "Provide A Temporary Groundcover On Exterior Slopes And Inactive Fill Areas Every
Spring And Fall".
A 2:1 slope note was added to the Permanent HDPE Slope Drain profile on Sheet 8. The slope
labels have also been added to Profile A-A and are shown on Profile B-B.
4. Provide details regarding the elimination of the basinds, such as when and how they will be
eliminated.Basins must only be removed when the areas draining into them are completely stabilized.
The construction sequence includes notes that the upstream areas must be stabilized prior to the
removal of a sediment basin. The majority of the area originally draining into a sediment basin
at the beginning of a phase will be diverted to flow north by the proposed grading. This will
leave a reduced drainage basin that includes the diversion ditch at the toe of the slopes, the slope
benches and the storage area in the basin flowing into the basin. A note has been added to place
North American Green SC150BN on the fill slopes in areas where the basins are being filled.
A construction detail showing the removal of the sediment basin has been added to Sheet 9.
5. Provide additional sediment control measures for Phase 1 construction(Sheet 3 of 9).
A diversion berm has been added on the southern end of the disturbed area. The berm will be
constructed during the initial phases of clearing to divert runoff north and west. Seethe
construction sequence and Inset B on Sheet 3.
The slope drain on the southern end of the fill area for Phase 1 has been shifted and revised to
flow into the diversion channel running south to reduce the potential for sediment to flow south
from this area.
alley, Williams, carmen & king, inc. as
OK

Ms.,Judy Wehner, Assistant State Mining Specialist
July 10,2020
Page 3
All other areas drain to the south and into the pit.
6. Extend the temporary diversion ditches in Phase 2 and Phase 3 up to Phase 1 construction drawings.
The diversion channel along the southern end of the site in Phase 2 begins at the western edge of
Phase 1. Additional silt fence has been shown in this area.
The slopes in Phase I will have been stabilized once construction of Phase 3 begins. Silt fence
has been added to areas where a sediment basin will be removed.
7. Provide sediment ontrol for the small section that flows south.
A diversion berm has been added to the initial construction of Phase 1. Silt fence has been added
to the area below the fill slope for Phase 2. Please note that this area will be stabilized during in
the early stage of Phase I construction.
8. Provide plunge pools for the slope drains.
Plunge pools have been added to the slope drains. See the construction detail on Sheet 9. A
symbol has been added to the site plans and the mine map legend. A note has been added to the
slope drain detail on sheet 8.
A copy of the design calculations for the plunge pool is attached. A worst case design has been
provided and all slope drains will use this design for the outlets.
9. Provide wattles and matting along the long benches.
Wattles have been provide at the inlets of all slopes drains. The legend has been revised to
include the use wattles at inlets and a wattle detail has been added to sheet 9.
Notes have been added to the construction sequence of each phase of the project directing the
installation of wattles at slope drain inlets and North American Green SC 125 as a liner in the
slope benches. Labels have also been added to the site plans.
Wattles are not shown in the drainage benches if the channel has been stabilized in an earlier
phase.
The following items were also revised in the construction drawings:
• The sediment basin detail on Sheet 7 was revised to make a note concerning a access pier an
alternate for construction. VMC will decide if a pier is needed for access after the basins are
constructed.
• The text for the scales used for Profile A-A on Sheet 8 were corrected to reflect a 1"=100'/1"=10'
ratio. an
alley, Williams, carmen & king, inc. _ OK

Ms. Judy Wehner,Assistant State Mining Specialist
b 1
July 10,2020
Page 4
• Additional labels have been added for the temporary high wall barrier located at the top of the
grading for each phase.
• A note was added to indicate that the permanent storm drainage systems installed as part of the
material storage area construction were to remain.
If you have any questions or need additional information,please do not hesitate to contact me.
Sincerely,
Alley, Williams, Carmen and King,Inc.
Wesley ebb, P.E.
alley, williams, carmen & king, inc. am