SW6220504_Comment Response_20220926 (2)

Bowman
Project: Cameron Village
Location: Club Pond Road, Raeford, Hoke County
Jurisdiction: NCDEQ
Date: 8/22/22
Subject: SW Comments SW6220504
4006 Barrett Drive, Suite 104
Raleigh, North Carolina, 27609
TEL [phone]
Comment
Response
General Design Comments
Response
Please provide the riprap sizing calculations (This item is required per
✓
Riprap sizing calculations have been included.
General MDC 4 and 15A NCAC 02H A 042(2)(f)). It is noted that the riprap
apron size information is included on plan sheet EC-1, however, I did not see
the calculations showing how these numbers were derived/showing that they
are adequately sized.
There appears to be some new BUA being added to the site (on Club Pond
✓
Third column has been added on the Drainage Areas Page
Road & Eaton Lane) that does not drain to the SCM. The amount of untreated
showing the bypass impervious areas not draining to the
new BUA appears to be less than the amount of existing BUA for the site
(17,230 sf) so it does not need to be treated (since the net increase in BUA for
SCM. The project density has been updated on page 3 of the
stormwater application. The total BUA has been updated.
the site is being treated), but it does need to be accounted for in the Entire Site
Column of the Drainage Areas Page of the Supplement-EZ Form (see below
comment). The BUA amounts shown in the wet pond drainage area columns
won't add up to the entire site column since there is some BUA located on -
site, but not located within the drainage area of either SCM (While not
required, you can include a bypass drainage area on this form so that the BUA
values in the 3 drainage area columns (wet pond 1, wet pond 2, and bypass)
add up to the entire site column (The form is not set up to do this, it would
just be for clarity)). You will need to update the total amount of BUA within
the project area ("entire site") and, depending on the exact amount of BUA
located on -site but not within an SCM drainage area, you may need to
recalculate/update the project density.

Bowman
4006 Barrett Drive, Suite 104
Raleigh, North Carolina, 27609
TEL [phone]
Wet Pond 1 Design Comments
Response
Plan sheet SCM-1 shows a 5" diameter drawdown orifice being drilled into a
✓
Drawdown pipe revised to 6".
4" diameter PVC pipe. Please either increase the diameter of the PVC pipe so
that it is as large as or larger than the drawdown orifice or reduce the size of
the drawdown orifice so that it will fit within the PVC pipe (provide revised
drawdown calculations if changing the size of the drawdown orifice).
NOTE: It is noted that wet pond 1 is adequately sized for what is currently
✓
n/a
being permitted (Drainage area of 1,141,886 sf with 475,548 sf of BUA) as
well as the future build -out conditions (Drainage area of 1,866,124 sf with
900,331 sf of BUA). The permit will be written to reflect what is currently
being permitted, but a note will be added to the permit indicating that the wet
pond is oversized to handle a drainage area of 1,866,124 sf with 900,331 sf of
BUA.
Su lement-EZ Form Comments
Response
Cover Page:
✓
Setback has been included.
- Line 7 — Please indicate the width of the required vegetated setback
30 ft from the surface waters to the west of the project site.
Drainage Area Page:
✓
The total BUA has been updated per previous comment.
- Entire Site Column:
Existing BUA is recorded on Line 15. The project density has
o General — Please ensure that all of the BUA located within
the project area (not just the portions of the portions of the
been included in Line 18 and updated on page 3 of the
stormwater application.
project area draining to the wet ponds) is accounted for in
this column
o Line 15 — Please ensure that the existing BUA is recorded in
this column.
o Line 18 Please include the %BUA for the project area (this
information should match the information shown in Section
IV, 8 of the Application).
Drainage Area Page:
✓
The BUA allocated to individual lots recorded on Line 9.
- Entire Site Column:
o Line 9/Line 12, Roof — The BUA allocated to the individual
lots should be recorded on Line 9 (new BUA on subdivided
lots), not under Line 12 (breakdown of BUA not on
subdivided lots).

Bowman
4006 Barrett Drive, Suite 104
Raleigh, North Carolina, 27609
TEL [phone]
Drainage Area Page:
✓
Line 10 has been revised.
- Entire Site Column:
o Line 10 — Line 10 should be the sum of the items shown on
Line 12 (the BUA located in common areas/not allocated to
the individual lots).
Wet Pond Page
Response
Lines 25/35/40 — The design volume of the SCM is typically the volume that
✓
Lines 25/35/40 have been revised to provide additional
can be stored above the permanent pool surface and below the bypass weir (@
treatment capacity for the SCMs.
257.8' for wet pond 1 and @ 256.3' for wet pond 2), i.e., the volume that gets
drawn down via the drawdown orifice only. You can keep the design volume
as the minimum required treatment volume if you wish, however increasing
the design volume up to the bypass weir provides additional treatment
capacity for the SCMs.