Southstone - 2018-02-01 RTC NCEMLR - Response to Request for Additional Information

RESPONSE TO COMMENTS > TAC-17000
3436 Toringdon Way, Suite 110, Charlotte, NC 28277 / 704. 527. 0800creatingexperiencesthrough experience
February 1, 2018
North Carolina Division of Energy, Mineral and Land Resources
Environmental Quality
Stormwater Permitting
1612 Mail Service Center
Raleigh, North Carolina 27699-1612
RE:Stormwater Permit No. SW3171102
Southstone
Union County
Response to Request for Additional Information
TAC-17000
The following are the response comments for the above-mentioned project. Our response comments are in bold.
STORMWATER PERMITTING:
Robert D. Patterson, PE - 919. 807. 6369
1.The property owner must also sign the application form SWU-101 (original signature needed). That signature
was left blank on the form submitted.
McAdams Response: The signature has been included on form SWU-101.
2.Provide the property owner’s email address on SWU-101.
McAdams Response: The email address has been included on form SWU-101.
3.The person signing the application, O&M Agreement, and deed restrictions form mustbe a member/manager
of the LLC as listed with the NC Secretary of State. Or provide a signed letter from one of the
member/managers listed giving Todd Terwilliger signature authority. The NCSoS shows Dror Bezalel as the
Manager.
McAdams Response: Updated signatures have been included on the application, O&M form, and deed
restriction.
4.02H .0602(a) states that SCMs used shall promote infiltration of flows and groundwater recharge, or provide a
written explanation when it is not practical to use infiltration.
McAdams Response: Level spreaders have been provided at each stormwater facility to promote
infiltration to the extent practicable.
5.Remove “Preliminary” from the plans. They need to be marked “final for permitting”, “final”, or similar.
RESPONSE TO COMMENTS > TAC-17000
creating experiences through experience 2 of 3
McAdams Response: “Preliminary” has been replaced with “Final Drawing” on all sheets.
6.The stream located between SCM A and B is shown as 50’. 02H .0605 requires a 100’ buffer for streams not
located in the floodplain.
McAdams Response: Please see attached correspondence from the Town of Stallings regarding the
stream buffer.
7.Revise wetland SCMs A, C, E, & F:
a.Provide a cross-section of the wetland, not just the dam embankment.
McAdams Response: These have been provided for each facility.
b.The temporary inundation zone must be dry between rain events, so it cannot be the exact same elevation
as the PPE it is currently shown.
McAdams Response: The interior grading has been revised accordingly.
c.The supplement form states a 6” deep shallow water area, but the plans only show 3” deep.
McAdams Response: The supplement form has been revised accordingly.
d.The WQV and 1-yr stages on the cross-section are not consistent with that shown in the calcs.
McAdams Response: This has been revised.
8.SW-E1:
a.Remove the siphon note in the label for the riser outlet since the 2.25” orifice is provided in the
siphon headwall.
McAdams Response: The note has been removed.
b.Provide a berm/baffle to prevent short-circuiting between the south forebayand outlet deep
pool.
McAdams Response: A berm has been graded into facility above the water quality elevation. Please
note that SWMF E was relocated.
9.Revise wetpond SCMs B & D:
a.Provide a cross-section of the wetland, not just the dam embankment.
McAdams Response: These have been provided for each facility.
b.The WQV and 1-yr stages on the cross-section are not consistent with that shown in the calcs.
McAdams Response: This has been revised.
RESPONSE TO COMMENTS > TAC-17000
creating experiences through experience 3 of 3
10.Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1 hardcopy of other documents. Pdfs
must be uploaded using the form at:https://edocs.deq.nc.gov/Forms/SW_Project_Submittal
McAdams Response: These have all been provided.
Consideration of this response is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at 704. 527. 0800.
Sincerely,
MCADAMS
Jon Aldridge, PE
Senior Project Manager, Water Resources + Infrastructure