20210726_LQS_Comments

From:
Denton, Bill
To:
Parr, Adam
Cc:
Garcia, Lauren V
Subject:
98-34 Flat Rock Pit transfer - RRO comments
Date:
Monday, July 26, 2021 3:37:24 PM
Attachments:
98-34 20210726 InsDRDt.odf
Adam,
Joe and Lauren visited these sites today. RRO comments are as follows:
1. The most recent mining map is from 2013. A map representing current site conditions should
be submitted and include all items listed in Part 2 (items a-o) of the mining permit application.
a. There are stockpiles and inert debris piles onsite that are not depicted in the map.
b. Basin B does not match the basin depicted in the map. The riser and outlet are
depicted through the spillway, but are installed in a different location. The basin
currently outlets through a perforated riser, but a skimmer is recommended. If the riser
remains installed it will need a trash rack.
c. Part of the access road is depicted in the map as being located in the undisturbed
buffer.
2. An NCG020000 General Industrial Stormwater Permit has not been issued to a Flat Rock Mine.
The site has a concentrated discharge from a riser basin.
3. Some slopes and stockpiles require stabilization. The area around the outlet of Basin B
requires stabilization.
If you need any additional information, please advise.
Best regards,
Bill
William H. Denton, IV, PE
Regional Engineer — RRO
Division of Energy, Mineral, and Land Resources — Land Quality Section
Department of Environmental Quality
919 791 4200 office
bill.denton&ncdenr.gov
1628 Mail Service Center, Raleigh, North Carolina 27699
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