Response to 12-7-20 DEQ Request 1-18-21

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0"Hanson
HEIDELBERGCEMENTGroup
Hanson Aggregates Southeast,LLC
South Region
North Carolina Territory Office
3825 Barrett Drive,Suite 300
Morrisville,NC 27560-9626
Tel [phone]
Fax [phone]
January 18, 2021
Mr. Adam R. Parr, Asst. State Mining Engineer
NC Department of Environmental Quality
Division of Energy, Mineral, and Land Resources
512 North Salisbury Street, Archdale Bldg, Room 504
Raleigh, NC 27604
Subject: Hanson Aggregates Southeast, LLC— Raleigh Quarry
Response to DEQ December 7, 2020 Request for Information
NC Mine Permit No. 92-02 Mine Modification Application Submittal
Wake Forest, Wake County, North Carolina
Dear Mr. Parr:
Hanson is hereby submitting a response to the Department's December 7, 2020
request for additional information. The responses are formatted in the manner they were
received, followed with our response in bold. We appreciate your review and comments
regarding our application to provide a 6-acre area for a tenant to install a concrete plant at
our Raleigh Quarry located in Wake Forest, NC.
1. The proposed entrance road, as shown on the modification maps dated August
2020, will not be approved as drawn. Please determine a suitable location for the
proposed entrance road that does not impact the permitted undisturbed buffer and
visual screening berm.
The proposed entrance road has been relocated to be south of the existing
visual screening berm and undisturbed buffer. Refer to the revised plans for
the new location, specifically M&EC-1, M&EC-2, and M&EC-4. Sediment Trap
A-11 has been increased slightly to accommodate the project. Calculations
can be found on the M&ECP-4 Map and attached calculations page prepared
by Ryan Fisher, PE with WithersRavenel.
2. Sediment Trap A-2 and the visual screening berm in the same vicinity appear to
impact the eastern most end of'Stream 1" as depicted on the US Army Corps of
Engineering Jurisdictional Delineation. The DWR buffer determination letter 19-249
submitted along with the package was for streams and pond located on the
property approximately 4,500 feet south of"Stream 1". Please clarify how impact to
"Stream V will be mitigated.

A diversion ditch/berm has been extended past Trap A-2 and will convey
runoff to Sediment Trap A-7, thus bypassing trap A-2, which allows for the
removal of Sediment Trap A-2. By re-routing the run-off to Sediment Trap A-7,
there will be no impact to "Stream 1".We appreciate the Department pointing
out the potential stream impact initially submitted. Sediment Trap A-7 has
been increased slightly to accommodate the project. Calculations can be
found on the M&EC-4 Map and attached calculations page prepared by Ryan
Fisher, PE with WithersRavenel.
3. Provide a plan detail and construction specifications for the silt fence and silt fence
outlet that complies with the skirt trench requirements per the Erosion and
Sediment Control Planning and Design Manual. The skirt is to be trenched in, at a
minimum, 8" vertically and 4" horizontally.
The plan details on Sheet X-6 have been revised accordingly.
4. A gas line is located in the area of the new driveway. Actual location should be
determined, and any easements obtained from the utility.
Since the new driveway has been relocated to avoid the undisturbed buffer,
separation has been provided from the gas utility. "811 call before you dig"
will be utilized prior any driveway installation.
5. A DOT Encroachment is needed for new entrance.
The proposed driveway will be submitted to the district office of NCDOT for
their approval.
We trust the above responses satisfactorily address the Department concerns and that the
processing of the modification application can continue. Two (2) complete sets of revised
mine maps and calculations page are attached to this cover letter. Should you have any
questions or need additional information, please contact me at our Raleigh office: (336)
669-7565, [e-mail] , and you may also contact our contracted
engineer, Ryan Fisher: [phone], rfishe[@withersravenel.com .
Sincerely,
�v
Jack Garvey, Environmental Manager
Enclosures:
cc: Daren McMorris, NC Operations Manager
Randy Vinkler, Plant Manager
Ryan Fisher, WithersRavenel

Ito WithersRavenel
1i0 Our Peopte. Your Success.
EROSION CONTROL CALCULATIONS
HANSON RALEIGH QUARRY
Rateigh, NC
Prepared For:
Hanson Aggregates Southeast,LLC
3825 Barrett Dr.
Suite 300
Raleigh, NC 27609
[phone]
ATTN:Jack Garvey
Prepared By:
WithersRavenel
137 S.Wilmington St.,Suite 200
Raleigh, NC 27601
[phone]
License No.C-0832
January 2021
WR No.09200040.00
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Ryan Fisher, PE

SEDIMENT TRAP CALCULATIONS
Hanson Raleigh Quarry WR No.09200040.00
Erosion Control Calculations January 2021

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