SW3190501_Response to Comments_20190701

SAIMOS
EIJC,IIJEERflJC;, LLC.
Response to Review Comments
Date 6/21/19
NCDEQ
512 North Salisbury Street
Raleigh, NC 27699
[phone]
Reference: UPS Statesville/ Iredell County
147 Parcel Dr.
Statesville, NC 28625
Stormwater Permit #SW3190501
Response to Request for Additional Information
Please accept the following responses to your correction letter dated: 6/10/19
Stormwater: Jim Farkas [phone] Jim. Farkas(a-)-ncdenr.gov
A review of the Application submitted on May 6, 2019 has determined that the
application is not complete. The following information is needed to continue the
stormwater review:
1. Please include the stream name and classification for where the roadside ditch
ultimately outfalls to on the application (Section IV, 10, Receiving Stream Name).
RESPONSE: Stream name and classification were added into Section IV of the
revised SMP application.
2. Please include only the area that drains to the BMP, not the entire property area, in
the drainage area section of the application (Section IV, 10, Total Drainage Area).
Please also recalculate the values for on -site and off -site drainage areas to reflect this
change.
RESPONSE: Areas draining exclusively to the BMP were added into Section IV
of the revised SMP application. Off -site pervious area was also added to Section
IV and the stormwater calculations.
3. Please complete a Supplement EZ form for each BMP. The Supplement EZ form
can be found here: https://deg.nc.gov/about/divisions/energy-mineral-land-
resources/energy- mineral-land-permit-quidance/stormwater-bmp-manual (Section V).
RESPONSE: Supplement EZ forms for the proposed wetland and the treatment
swa/e were completed and are enclosed.
Page 1 of 4

SAIMOS
`• EIJC,IIJEERfIJC,, LLC.
Response to Review Comments
4. Please provide signed, sealed, and dated design calculations (Section VI, 7).
Calculations should include, but are not limited to:
a. Calculations showing that the rip -rap at the inlet of the stormwater wetland and
lack of rip -rap downstream of M.E.S.-3 are sufficient to prevent erosion during
the peak flow from the 10-year storm (As per 15A NCAC 02H .1050(4)).
RESPONSE: Drainage system calculation included in Appendix D of the
Stormwater Report indicate a maximum "physical" velocity of 5.0 fps in
MES-1 and 4.6 fps in MES-3 for the 10-year storm. A grassed swa/e will
provide adequate erosion protection on the swa/es at these velocities.
However, a rip -rap protection was added at both M.E.S outlets to provide
additional protection.
b. Calculations showing that the 0.75in/hr storm will pass through the grass swale
at a rate of 0.5 fps or less, with a depth of 6 inches or less, in at least 4 minutes
(As per 15A NCAC 02H .1061(3))
RESPONSE: Calculations for the grassed swa/e during the 0.75 in/hr storm
were added in Appendix D of the Stormwater Report.
c. Calculations showing that the 10-year storm will be passed at a non -erosive
velocity (As per 15A NCAC 02H .1061(5).
RESPONSE: Calculations for the grassed swa/e during the 10-year storm
were added in Appendix D of the Stormwater Report.
5. Please delineate the wetlands on the plans or provide a note stating that no
wetlands exist. Provide documentation of the qualifications and identity of the
individual who made this determination (Section VI, 8, m).
RESPONSE: Please see wetland assessment letter from Environmental
Services, Inc. included in Appendix E of the Stormwater Report. Also, refer to
sheet C2.0 for existing small man-made stormwater basin.
6. Please show the drainage areas for the BMPs on the plans (Section VI, 8, o).
RESPONSE: Drainage areas for the BMP are shown on the Post -Development
Basin Map (Exhibit PB) included in Appendix A of the Stormwater Report. Basin
map and calculations were revised to include an off -site area.
7. Please provide a copy of the current property deed (Section VI, 10).
RESPONSE: A copy of the warranty deed is included with this resubmittal
package.
8. Please provide official documents with name, title, and position for those listed in
Section III of the application (Section VI, 11).
RESPONSE: A Power of Attorney for the signing official Kenneth Haynes and
NC Business Corporation Officer registration for Richard D. Bishop is included
with this resubmittal package.
Page 2 of 4

SAIMOS
EIJC,IIJEERfIJC,, LLC.
Response to Review Comments
9. The spot elevations of the grass swale, 823.70 feet on the downstream side and
824.00 feet (Shown incorrectly in the stormwater management report, page 4, and
inferred from cross-section A -A on sheet C2.0) imply that the grass swale has a slope
of 0.003 ft/ft. This slope is shown as 0.03% (Equal to 0.0003 ft/ft) on the plans. Please
revise for consistency.
RESPONSE: Grassed swale geometry and slope have been revised. Proposed
slope is now 0.04%, plans and calculations were revised accordingly.
10. The stormwater wetland grading shown in the plans does not match the grading
shown in the stormwater management report. Please revise for consistency.
RESPONSE: Plans and report were revised for consistency.
11. The forebay area appears to be less than 10% of the stormwater wetland surface
area, less than 24" deep, and at a higher elevation than the outlet. Please revise in
accordance with 15A NCAC 02H .1054(6).
RESPONSE: Stormwater wetland geometry was adjusted to meet design criteria.
Please refer to sheet LS-3 for revised wetland areas and corresponding
percentages.
12. The requisite "deep pools" for the stormwater wetland do not appear to be shown
on the plans. Please revise in accordance with 15A NCAC 02H .1054(7).
RESPONSE: Please refer to sheet LS-3 for "deep pool" areas and corresponding
percentages.
13. Sod is not an acceptable planting for a stormwater wetland. Please delineate the
planting zones and select appropriate plants in accordance with 15A NCAC 02H
.1054(12)(a), 15A NCAC 02H .1054(13), and 15A NCAC 02H .1054(14).
RESPONSE: Sod was replaced for FS (Fox Sedge) along the wetland perimeter.
Tall Fescue (Sod) is proposed in the grassed swale and other upland areas near
the wetland. Please refer to sheet LS-3 for planting zones.
14. Please provide a trash rack or other device to trap debris on M.E.S.-2 in
accordance with 15A NCAC 02H .1054(17).
RESPONSE: Trash rack is now proposed on MES-2. See detail on sheet C4.0.
15. 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.deg.nc.gov/Forms/SW Project Submittal
RESPONSE: Acknowledged. PDF's will be uploaded to eDocs and hard copies of
the revised plans and documents are provided.
Page 3 of 4

CA1zkros
EIJC,IIJCfP'1IJG, LLC.
Response to Review Comments
While it is not required, it is recommended that the off -site drainage from upstream
properties be diverted around the BMPs since the applicant cannot maintain control
over the development of property that they do not own.
RESPONSE: Due to the hilly topo and dense wood on the east (back) of the
property, it was not feasible to divert all the off -site runoff from that area and
prevent it from getting into the BMPs.
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 July
10, 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 SW3190501 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
Jim. Farkas(d)-ncdenr.gov or [phone].
Sincerely,
BARRIOS ENGINEERING, LLC
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