SW6220506_Response To Comments_20220914

[e-mail]
To: Farkas, Jim J
Subject: RE: SW6220506 Williford Cove
Jeffrey Nobles, PE
Larry King & Associates, RLS, PA
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From: Farkas, Jim J <[e-mail]>
Sent: Wednesday, August 24, 2022 3:25 PM
To: [e-mail]
Cc: [e-mail]
Subject: RE: SW6220506 Williford Cove
Jeffrey,
I was looking over the information you provided on 5/31/22. Everything looks good except for a few small issues:
Please correct the following:
- General:
o Please provide a source for the 10-year design storm intensity (i) values used. If you are using times of
concentration greater than 5 minutes, please also provided calculations for the times of concentration
used. All 1U ycai ,LVI III LOILUIdLIUIIb UJC d , 111111ULe tune of concentrdtion (i=i.y2 in/hr). 25 year storm
..culations use a 5 minute time of concentration (i=8.88 in/hr).
o The calculations for ditches 7 & 8 are missing from the calculation booklet.
o The actual velocity for ditch 20 (2.21 fps) is greater than the allowable velocity for ditch 20 (2.00 fps).
Per our email conversation, the max velocity for Ditch 20 was mis-labeled as max velocity of 2 fps. Ditch
20 has been corrected to 5 fps max velocity.
Application, Section IV,10: Revised Page 3 included with resubmittal
o Please exclude the surface water area (0.56 ac) from the "Total Drainage Area" and "On -site Drainage
Area" items of this table. Removed
o Please recalculate the "% Impervious Area" item (per the prior comment). Updated
Supplement-EZ Form: Revised Supplement-EZ form included with resubmittal
o Cover Page:
■ Line 2 — Please exclude the surface water area (0.56 ac) from this item. :orrected
o Drainage Area Page:
■ Line 5 —Please exclude the surface water area (0.56 ac) from this item.:orrected
■ Line 12 — Please list the type(s) of BUA that comprise the BUA not on subdivided lots (per the
Application, the 151,310 sf of BUA not on subdivided lots is all roadway). yes, all roadway.
Added to Line 12 for clarification.
■ Line 18 — Please recalculate (if needed). Recalculated, but the rounding by the spreadsheet does
not reflect a change
■ Line 19 — This item is not needed. Removed.

o Low -Density Page:
■ Line 4 — Please elaborate in the additional information section (Line 15). For example, you can
say that the side slopes are 3:1 or flatter or you can list the different side slope configurations
that are used (and the corresponding swales). 4ote added. .
■ Line 5 — Per the provided calculations, the maximum velocity in the vegetated conveyances
during the 10-year design storm is 2.21 fps (Ditch 20). This item is asking for the maximum
actual velocity, not the maximum allowable velocity. Cl Uur C111au LUffifCibaLIU11, the nldX
velocity for Ditch 20 was mis-labeled as max velocit, of 2 fps. Ditch 20 has been corrected to 5
fps max velocity. Swales 21 & 12 have been updated to reflect a max velocity of 2 fps since they
dicrharge into wetlanric
■ Swale 20 — As noted above, the actual velocity for ditch 20 (2.21 fps) is greater than the
allowable velocity for ditch 20 (2.00 fps). See comment above.
Please note, Future Development Lots A & B are only allocated 5,000 sf of BUA, if you would like to increase the
amount of BUA that these lots are allocated, you will need to revise the deed restriction document (a new
original signed hard copy would need to be provided).
Please provide the following:
- 1x hard copy & 1x electronic copy of the revised pages of the calculations.
- 1x hard copy & 1x electronic copy of the revised pages of the Application.
- 1x hard copy & 1x electronic copy of the revised pages of the Supplement-EZ Form.
- 1x hard copy (2x hard copies for plan sheets) & 1x electronic copy of anything else needed to address these
comments.
Hard copies should be mailed to me at the following address:
For FedEx/UPS:
Jim Farkas
512 N. Salisbury Street, Office 640M
Raleigh, NC 27604
For USPS:
Jim Farkas
1612 Mail Service Center
Raleigh, NC 27699-1612
Hand Delivery:
Please reach out to me prior to hand delivering a submission to make sure that 1 (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.
Electronic copies should be uploaded at the following location:
https:Hedocs.deg.nc.gov/Forms/SW-Supplemental-Upload
Since these are really minor things, once I get the hard copies, anything else that may have changed from addressing
these issues, and the documents are uploaded to Laserfiche (Provided everything is still in order), we can issue the
permit without doing another formal review.
Let me know if you have any questions.