SW6201003_1617 Comment Response Letter_20201201

November 17, 2020

NCDEQ Division of Water Quality
Attn: Jim Farkas
512 N. Salisbury Street
Raleigh, NC 27604

RE: SW6201003
Storm Water Comments Addressed, Village at Rockfish Ph IV, Cumberland County, North Carolina

Jim,

We have reviewed the comments that you sent and have addressed them all. The information below gives
some information on how each of the comments was addressed:

NOTE: Since the entire property area (53.10 ac) is included in the project area, any future
development within this project area (as indicated on the plans) must be approved via a
modification to this permit (once approved). Alternatively, you can modify the project area to
only include the current phase of development (Once the future development is designed & ready
to be built, it would then need to get its own permit). Either approach is acceptable.
The project area has been listed on the updated supplement form as

1. Please show the area of the total drainage area and on-site drainage area to the proposed
SCM in square feet, instead of acres (Section IV, 10).
a. The information in IV, 10 is now expressed in sq. ft.

2. Based on the information in Section IV,10, there does not appear to be any off-site
component to the drainage area to the proposed SCM (However, this information cannot
be verified since a delineated drainage area to the proposed SCM was not provided). If
there are no off-site components to the proposed SCM drainage area, Section IV, 11 is
not required.
a. There is no off-site component to the drainage area. The response to IV, 11 has

3. Please complete and submit a Supplement-EZ Form. The provided form has not been
updated since 2012 and the rules/design requirements have since been updated. The most
recent version of the Supplement EZ form can be found at the following link:
https://deq.nc.gov/about/divisions/energy-mineral-land-resources/energy-mineral-land-
permit-guidance/stormwater-bmp-manua« (Section V & Section VI, 3)ȁ
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¨­¢«´£¤£ ¨­ ³§¨² ±¤²´¡¬¨³³ «ȁ

4. Please complete the attached O&M Agreement Wet Detention Pond Design
Removal
(We are currently remedying this). NOTE: The cover page of the O&M
Agreement Form does not need to be re-signed, only this page needs to be
updated.
a. The provided O&M Agreement Wet Detention Pond Design Summary
has been completed and is included in the resubmittal.

5. Please show the area (in acres or square feet) of surface water area within the
project area in the main set of plans (Section VI, 8h)
a. There is not any surface water within the project area. Per your note at
the beginning of the comments we are going to define this phase of the
development as its own project and the remainder of the property, if
ever improved, will be under a separate permit.

6. Please show the entire project boundary (dimensioned with bearings and
distances) in the main set of plans (Section VI, 8i).
a. A new boundary line has been added behind the pond that defines the
-off line is labeled with
bearings and distances. The site data block has also been updated to
reflect a

7. Please identify and dimension all BUA within the project area (Section VI,
8j). The information entered into the Application & Supplemental Forms
should be verifiable on the plans.
a. The dimensions for the roadways and sidewalks are given on the
plans. The BUA within the lots is projected and represents the
maximum allowable. This was forecasted at 4,200 sf per lot.

8. Please provide documentation of the qualifications and identity of the
individual who made the wetland determination for this site (Section VI,
8m).
a. Mike Eaker, Southeastern Soil & Environmental, 910-822-4540
b. We can also send you the final report for the site if you require
more information on the delineation.

9. Please show the drainage area to the proposed SCM in the main set of plans
(Section VI, 8o).
a. I have created sheet C3.3 in the plan set that shows the drainage area
for the SCM.

10. Please show the required vegetated setbacks from surface waters in the main
set of plans (Section VI, 8p).
a. There are no surface waters within 50 of the project boundary. No
setbacks have been shown.

NOTE: The proposed SCM could not be reviewed for compliance with all of the
Minimum Design Criteria (MDC) due to the incompleteness of the submission. I
reviewed what I could, the following comments were noted during the review:

11. Please provide a stage-storage table for the forebay and main pool
portions of the proposed wet pond so that sizing requirements (Wet Pond
MDCs 1, 2, & 5a) can be verified.
a. The stage-storage table is provided as requested.

12. The surface area used in the SA/DA calculations is the surface area of the main
pool, not the entire surface area at the permanent pool elevation. It also
appears that the SA/DA ta
an average depth of 3 feet) does not coincide with the SA/DA table values as
shown in the Manual (1.79% for 50% impervious area & an average depth of 3
feet). Please ensure that the latest version of the table is being used (Wet Pond
MDC 1).
a. The volumes required and surface area calculations have been updated
to reflect the newest guidelines.

13. Please ensure that important benchmarks (including the permanent pool
elevation, sediment storage top elevation, forebay entrance elevation, &
forebay exit elevation) are labeled on the wet pond forebay cross-section (Wet
Pond MDCs 3 & 5b).
a. Done

14. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and 1
hardcopy of other documents.
a. Enclosed or uploaded.

I look forward to working with you on this project. If you have any questions or
concerns, please feel free to contact us.
Sincerely,
4D Site Solutions, Inc.

Sincerely,
4D Site Solutions Inc.

Chris Pusey, PLS
[e-mail]

Enclosure
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