SW3190703_AddInfoRequest_20191007

ROY COOPER
Governor
MICHAEL S. REGAN
Secretary
S. DANIEL SMITH
Director
Kris Rowe
LandDesign
223 N. Graham Street
Charlotte, NC 28202
NORTH CAROLINA
Environmental Quality
October 7, 2019
Subject: Request for Additional Information
Stormwater Permit No. SW3190703
Hemby Place
Union County
Dear Kris Rowe:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on July 30, 2019. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
Please update the drainage area table in Part IV of the application to include the receiving
stream name, stream class, and stream index number. This information can be found
using the Surface Water Body Classification Map.
2. This project appears to be in the Sixmile Creek Watershed. Projects in the Sixmile Creek
Watershed must also comply with the stormwater standards that apply to the Goose
Creek Watershed (15A NCAC 02B .0602).
3. The plans show surface waters that were not listed in the application in Section IVA.
Please estimate the total area of surface water and subtract it from the project area.
4. Please add a note to the plans stating who provided the wetland determination.
5. The applicant (Classica Homes) is listed in the application as the property owner, but the
deed states that the property owner is DeLaney Pecan Grove, LLC. Please explain the
discrepancy and make any changes required to fix it.
6. Please show a maintenance access and easement to the grading plan that meet the
requirements of General MDCs 8 and 9.
7. Please make the following updates to the Supplement EZ form:
D EQ �� North Carolina Department of Environmental Quality Division of Energy, Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center Raleigh, North Carolina 27699-1612
NORTH CAROLINA
Depadm.mofEnmmnm.maaualfty /� 919.707.9200

a. One the "Drainage Areas" sheet, the calculation method (Field 19) should be the
calculation method used to calculate the runoff volume (Simple Method or NRCS
Method).
b. The "Design volume of SCM" fields (Sheet "Drainage Areas", Field 18; Sheet
"Wet Pond" Fields 2 and 35) say 406,742 cf. This number seems erroneous and is
not reflected anywhere in the calculations. For Sheet "Drainage Areas", Field 18
and Sheet "Wet Pond", please list the calculated runoff volume for the 1" storm
and for Sheet "Wet Pond", Field 35 please list the total volume that can be stored
below the detention orifice (Note: we are in the process of updating the
Supplement EZ form to clarify the desired information in these fields).
c. Please list the species of turf that will be used on the dam and embankment (Sheet
"Wet Pond", Field 53).
d. The depth of the forebay at the entrance and exit (Sheet "Wet Pond", Fields 43
and 44, respectively) are listed as 102 inches and 90 inches, but the plan shows
the maximum depth of the forebay as 7 feet. Please revise these fields to match
the plans.
8. Please update the calculations to use only the main pool and exclude the forebay when
calculating the SA/DA ratio and average depth (Wet Pond MDC 1 and 2).
9. Please use the orifice equation as outlined in Part B of the Stormwater Design Manual
when calculating the drawdown time, using an average head of Ho/3.
10. How was the temporary pool elevation for the wet ponds calculated? The temporary pool
elevation should be the storage elevation of the water quality volume assuming no
outflow from the wet pond.
11. 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:Hedocs.deq.nc.gov/Forms/SW ProjectSubmittal
Please note that this request for additional information is in response to a preliminary review.
The requested information should be received by this Office prior to November 6, 2019, or
the application will be returned as incomplete. The return of a project will necessitate
resubmittal of all required items, including the application fee. Please reference the State
assigned project number SW3190703 on all correspondence.
If you need additional time to submit the information, please submit your request for a time
extension to the Division at the contact below. The request must indicate the date by which you
expect to submit the required information. The Division is allowed 90 days from the receipt of
a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an
approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject
to enforcement action pursuant to NCGS 143-215.6A.

If you have any questions concerning this matter please feel free to contact me at
Corey.Anen&ncdenr.gov or [phone].
Sincerely,
Corey Anen
Environmental Engineer
Stormwater Program
cc: Mooresville Regional Office