SW6220101_Add Info_20220307

ROY COOPER
Governor
ELIZABETH S. BISER
Secretary
BRIAN WRENN
Director
4D Site Solutions, Inc.
Attn: C. Scott Brown, PE
409 Chicago Drive, Suite 112
Fayetteville, NC 28306
AND
Caviness Land Development, Inc.
Attn Watson Caviness, President
1041 B Robeson Street
Fayetteville, NC 28305
NORTH CAROLINA
Environmental Quality
March 7, 2022
Subject: Request for Additional Information
Stormwater Permit No. SW6220101
Woodshire Subdivision — Phase 7
Harnett County
Dear Mr. Brown and Mr. Caviness:
The Division of Energy, Mineral and Land Resources (DEMLR), received a Stormwater
Management Permit Application for the subject project on January 10, 2022. A review of that
information has determined that the application is not complete. The following information is
needed to continue the stormwater review:
1. Please provide a signed cover page of the O&M Agreement Form. The signed O&M
Agreement Form from the initial pre -acceptance submission (12/16/2021) did not include
the low -density area on the cover page nor the low -density O&M requirements and the
O&M Agreement Form from the second pre -acceptance submission (1/10/2022) did not
include a signed cover page nor the low -density O&M requirements. Please provide a
signed cover page for this form (indicating a wet pond and low -density area) and ensure
that all of the pages are included. It is noted that the electronic copy of the form includes
the low -density O&M requirements, but the provided hard copy did not.
2. The project area as shown in Section IV, 7 of the Application does not correspond to the
project area ("drainage area") of the entire site as shown in the Supplement-EZ Form,
Drainage Areas Page. Please either revise as needed or explain the discrepancy.
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
512 North Salisbury Street 1 1612 Mail Service Center I Raleigh, North Carolina 27699-1612
NORTH CAROLINA _
oepm nt of EnvimnmwUl uwl ry 919.707.9200

3. The percent impervious area of the project area as shown in Section IV, 8 of the
Application does not correspond to the percent BUA of the entire site as shown in the
Supplement-EZ Form, Drainage Areas Page. Please either revise as needed or explain the
discrepancy.
4. It is unclear from plan sheet C-3.3 if the proposed path along Nursery Road is included in
the low -density or high -density portion of the project. Please clarify and revise as needed.
5. There appears to be an error with the BUA tabulation. The high -density drainage area
indicates that there will be 244,000 sf of BUA allocated to the individual lots and the
low -density area indicates that there will be 44,000 sf of BUA allocated to the individual
lots (total of 288,000 sf). The Deed Restriction Document indicates that each lot is
allocated 4,000 sf of BUA and the plans indicate that there are 71 lots associated with this
phase of development (4,000 sf/lot * 71 lots = 284,000 sf 0 288,000 sf). Please revise as
needed for consistency.
6. There appears to be an error in the way that the stage -storage tables calculate the
incremental and cumulative storage volumes at the lowest elevations of the main pool,
forebay, and temporary pool. For example, for the main pool, a cross -sectional area is not
provided for the top of the sediment storage zone (elevation 271.5). The way the
spreadsheet is set up, it assumes that the cross -sectional area at this elevation is equal to
the cross -sectional area at elevation 272.0 (2,783 sf) when, in reality, it is closer to 2,500
sf. This causes the incremental volume stored between elevation 271.5 and 272.0 to be
overreported (The calculation issue with the forebay and temporary pool are similar,
except that the lowest cross -sectional area is shown to be zero square feet which results in
an incremental storage between the two lowest elevations that is about half the volume of
what it should be). Please revise and ensure that the stage -storage tables are set up
correctly.
7. The provided stage -storage table for the forebay only goes up to elevation 277.5 (the
permanent pool elevation is at elevation 279.5). Please provide the rest of this table so
that the calculations may be verified.
8. The provided main pool surface area does not appear to be sufficient (Wet Pond MDC
lb). The provided calculations indicate that the minimum required surface area of the
main pool is 10,498 sf, but per the stage -storage table, only 9,632 sf of surface area are
provided for the main pool (the forebay surface area should not be included in this
calculation/determination). Please revise as needed.
9. Please revise the vegetated shelf planting detail on plan sheet C-6.1 to indicate that a
minimum of 3 diverse species of plant be provided (Wet Pond MDC 1 lb).
10. Please show the SCM maintenance access and easements in the main set of plans
(General MDC 8 & 9 and Section VI,8n).

11. The low -density portion of the project does not appear to meet the definition of low -
density (15A NCAC 02H .1003(2)(c)). Low -density areas are generally prohibited from
having piping networks (as shown on the low -density portion of the project behind lots
484 & 485). You can collect and divert off -site drainage around part of the low -density
area but collecting drainage from the low -density project area in the piping network as
shown on the plans is in violation of 15A NCAC 02H .1003(2)(c) since the piping of the
low -density areas can be avoided. Please revise the pipe network to avoid capturing the
on -site drainage areas.
12. There appears to be a ditch located behind the building pads on lots 505 — approximately
511. Please ensure that the drainage area divide between the high -density and low -density
portions of the project are correct in this area and include this ditch in the swale
calculations if needed.
13. Please ensure that the 10-year design flow calculations for the vegetated conveyances are
correct. Back -calculating the 10-year design storm intensity value from the provided
drainage area (A), rational coefficient (C), and flow (Q) results in a 10-year storm
intensity of about 5.3 inches per hour which seems low for this part of the state. If you are
using a Time of Concentration (Tc) value larger than 5 minutes to calculate these design
flows, please provide the Tc calculations. Please revise as needed.
14. Please show the drainage areas to the vegetated conveyances in the main set of plans
(Section VI, 8o).
15. Please correct the following issues with the Supplement-EZ Form (there may be other
issues with the form that need to be revised in accordance with earlier comments, but
these issues were noted during this review):
a. Drainage Areas Page:
i. Entire Site Column — Please do not include the off -site portions of the
drainage areas in this column (The "drainage area" of the entire site is
equal to the entire site area). The entire site column should only reflect the
project area, not any areas outside of the project area that drain to the on -
site SCM.
b. Wet Pond Page:
i. Line 26 — As previously mentioned the surface area of the main pool
should not include the surface are of the forebay.
ii. Lines 25, 27, & 32 — As previously mentioned, the provided stage -storage
tables appear to have calculation errors and these values will most -likely
need to be revised.
16. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, 1 hardcopy of other
documents, and a response to comments letter briefly describing how the comments have
been addressed.
a. Pdfs must be uploaded using the form at:

https://edocs.deq.nc.gov/Forms/SW-Supplemental-Upload
b. Hard copies must be mailed or delivered to the following address:
i. For FedEx/UPS:
Jim Farkas
512 N. Salisbury Street, Office 640E
Raleigh, NC 27604
ii. For LISPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612
iii. Hand Delivery:
Please reach out to me prior to hand delivering a submission to make
sure that I (or someone else in my group) will be able to receive the
submission. Do not leave the package in the foyer with the
security guard.
NOTE: Hard copies should not be sent to a Regional Office. Doing so
will delay the review process and the submission package may be lost
while being sent from the Regional Office to me in the Central Office.
While it is not required, it is recommended that the off -site drainage from upstream properties be
diverted around the SCM since the Applicant cannot maintain control over the development of
property that they do not own. If the Applicant elects to account for off -site drainage, there must
be a recorded legal agreement in place between the Applicant and the Owner of the upstream
property in which the Owner of the upstream property agrees to record a deed restriction limiting
the minimum/maximum amount of BUA on the upstream property that will be treated in the
Applicant's SCM, the locations and sizes of access and drainage easements, how construction
and/or ongoing maintenance costs will be handled, maintenance responsibility, a list of legal
recourses available to each party should one party fail to hold up their end of the agreement, and
any other related legal issues.
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 April 6, 2022, 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 SW6220101 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
[e-mail] or [phone].
Sincerely,
V- "I
Jim Farkas
Environmental Engineer
Stormwater Program
cc: Fayetteville Regional Office