SW6210503_Response To Comments_20211222

December 22, 2021
Jim Farkas
NCDEQ- Stormwater
512 N. Salisbury Street
Raleigh, NC 27699-1612
RE: Townsend Estates Subdivision
Jim;
We are re -submitting the plans for the Townsend Estates subdivision with the comments from
the December 2, 2021 review email addressed. The comments are addressed as noted below:
Please correct the following:
Please provide the revised Application and Supplement-EZ Form. These items were
requested as part of the request for additional information letter and were referenced
in the response to comments, but were not provided in either the hard copy submission
or the electronic submission. Some of the comments/responses could not be reviewed
since these items were not provided.
o Updated info on forms provided
Original Comment 3 —There still appears to be a discrepancy between the BUA within
the drainage area to the proposed SCM in the submission items:
o Required Storm Volume calculation page — BUA = 344,472 sf
o SCS Curve Number calculation page — BUA = 344,932 sf
o Application, Section IV, 10 — BUA = 347,932 sf (since an updated version was not
provided in this submission).
o Supplement-EZ Form — BUA = 319,423 sf (since an updated version was not
provided in this submission).
344,472 is the correct drainage area impervious area and should be
reflected on all docs.
• Original Comment 13.b.ii.1—An updated version of the Supplement-EZ Form was not
provided so this item could not be reviewed.
o The NP total area is 14,745, stage storage information now reflects this.
• Prior Comment 5 —An updated version of the Supplement-EZ Form was not provided so
this item could not be reviewed.
o Updated version of the Supplement included.
• Prior Comment 6.b —There still appears to be a discrepancy between the BUA amount
as shown on the SCS Curve Number calculation page and the other submission items
(see earlier comment).
o Discrepancy resolved.
• Prior Comment 6.c —The existing BUA as shown on the SCS Curve Number calculation
page still appears to be 60,588 sf (the response to the comment indicates that the value
had been revised to 54,000 sf, to coincide with the Supplement-EZ Form).
o Discrepancy resolved.
409 Chicago Drive, Suite 112, Fayetteviite, NC 28306
❑ffice 1 910-426-6777 fax [phone]
On time, every time. I www.4Dsitesolutions.com

Prior Comment 7 — Please provide an additional set of the revised plan sheets (C-3.0, C-
5.3, & C-6.1). A single set of these plans was provided with the 11/15/2021
resubmission, however we require two hard sets of plan sheets (We keep one on file in
the regional office and send one to the permittee for their records).
o We are sending two copies of Sht. C3.0, C5.3, & C6.1
If you have any additional questions or comments, please contact me at your earliest
convenience.
Sincerely,
4D Site Solutions Inc.
Scott Brown, PE
[e-mail]
Enclosure:
- Curve Number Calc
- Stage Storage below NP
- Supp EZ
- P. 4 - SWU 101 application