11523 Clear Creek 2022 modification mine permit application R1 cover

aHey, williams, carmen & king, inc.
Engineering • Land Surveying • Construction Inspection
February 25, 2022
Mr. Adam Parr PE, Assistant State Mining Specialist
NC DEQ
Division of Energy, Mineral, and Land Resources
Land Quality Section
512 North Salisbury Street
Raleigh, North Carolina 27604
Re: Clear Creek Quarry (Permit #60-11)
Mecklenburg County
2022 Mine Permit Modification Request for Additional Information
Dear Mr. Parr;
Please find enclosed two copies of the revised project drawings for the quarry. The plans have been
modified to address the comments in your review letter and to also add a material storage area on the
north side of the pit. This area was shown as being disturbed on the previous drawings.
Your comments have been listed below along with a description of the revisions that were made to
address your comments.
1. Please indicate and label on the mine map the outlets to the new basins.
The two basins proposed are rock dams that have spillways across the majority of the rock
embankment. A spot elevation with the elevation of the spillway is listed. I have adjusted the color
of the proposed rock Jana, added additional outlines for the rock dani features, and removed the
proposed grades on the rock section so the location of the structure is easier to see. The detail on
sheet 4 has also been modified to include a spillway elevation. A basin grading exhibit with a
larger scale has been added to the design calculations to show how the rock dam fits into the
terrain.
2. Please provide a note on the reclamation map clarifying that RD 01-11 will be removed as part of the
expansion. Other erosion and sediment control (E&SC) measures are shown. with a note stating they
will be removed.
The requested note has been added to the reclamation map. Notes have also been added to the mine
map to indicate which existing basins will be removed Barring the pit expansion.
3. Please clarify what will happened to observation well 04 on the west side of the pit during the
northwest expansion.
The observation well will be removed as the pit is expanded. A note has been added to the mine map
to indicated that the removal can not occur until approval has been obtained from NCDEQ-LQ. The
well is located near the edge of the cut limits and may not need to be removed depending on the field
conditions and depth of rock. If the well needs to be relocated, the new location can be determined in
the field with NCDEQ personnel prior to the removal of the well.
120 South Main
Street
P.O.
Box 1248
Kannapolis,
North Carolina 28082
Tel. -
704-938-1515
•Fax - 704-938-6810
awck.com
ESTABLISHED 1960

Mr. Adam Parr PE, Assistant State Mining Specialist
February 25, 2022
Page 2
4. Please clarify how runoff will be diverted to RD-22 along the clearing limits. Silt fence alone is not
adequate to function as a diversion channel.
On the north side of the clearing, the drainage area flowing to the silt fence during the original
clearing is less than 100 feet in width. The silt fence has been revised to include bends to prevent
runoff from traveling down the fence line and stone outlets. The temporary diversion on the west side
of the clearing will divert runoff to rock dam 22-2. A construction detail for the silt fence outlet has
been added to the detail sheet.
5. Please remove features from previous modifications.
The notes associated with previous mine featzn•es that are not relevant have been removed or
relocated. The label for the Northeast Berm was shied to the previously approved future berm on
the north side of the pit.
The following revisions were made to add a material storage area on the north side of the pit in the area
that was previously included as cleared area on the mine map
• A materials storage area labeled OB-22 has been added on the north side of the expansion area.
• Riprap Channel 224 has been added along the south side of materials storage area OB-22.
• The construction dimensions for Riprap Channel 22-1 have been added to the detail on Sheet 6.
The detail was altered to list a geotextile fabric beneath the stone.
• A construction detail for a silt fence stone outlet was added to Sheet 5
• A construction sequence for the materials storage area 013-22 berm has been added to detail sheet
5. A reference to the location of the sequence has been added to sheet 6 near the location of
construction sequences for other storage berm construction sequences. The sequence includes
provisions to keep the storage area runoff diverted to the south during construction.
• The data for the East Berm Extension has been removed from the Overburden Storage Area
Construction Sequence on detail Sheet 6.
• The spillway lengths for Rock Dams RD 2-1 and RD 22-2 were revised on Detail Sheet 3.
• The revision note on Detail Sheet 4 was corrected.
The calculation package has been revised to include a riprap channel design and a drainage basin exhibit
for the channel drainage area.
A digital copy of the package is being sent by email. If you have any questions or need additional
information, please do not hesitate to contact me at [phone].
Wesley Webb, PE
Alley, W* iams, Carmen and King, Inc.
alley, Williams, carmen &king, inc.