SW4240203_Response To Comments_20240625

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CIVIL ENGINEERS LAND SURVEYORS
LAND PLANNING
June 25, 2024
NC DEQ—Post Construction Stormwater Permitting
C/O Brianna Holland
State Stormwater Engineer
RE: First Request for Additional Information, Permit#SW44240203, Hidden Woods
Village Residential Subdivision
Ms. Holland:
Please find the response to the comments below for items indicated in your request for additional
information dated May 17, 2024. Revised documents and plans have been enclosed in this
submittal package.
Comment#1: "Application Section IV, 8— This item refers to the percent BUA for the entire
project area excluding the surface water area. Please revise. "
The top of banks have been surveyed and the BUA revised to 15.4%. The project area has been
revised and forms corrected.
Comment#2: "Supplement-EZ, Drainage Areas Page, Line 12—Please update with the
roadway square footage. "
The streets were constructed in the 2008-2009 time period have been deemed to be existing BUA
and exempt from any permitting requirements per the email from jim Farkas submitted with the
initial submittal documents and included in the documents submitted via the portal. A note was
added to item 22 indicating the sites' street are exempt from permitting.
Therefore, the streets BUA is shown on line 15 as existing BUA. It is my understanding based on
the above-mentioned email there is no new BUA not on subdivided lots, only the BUA associated
with each lot for homes, driveway and other impervious surface areas place on the lots.
Comment#3: "The total project area listed in the Application Section IV, 7 must be consistent
with the project area listed in the Supplement-EZ, Cover Page, Line 2. "
The application sheets 3and 4 as well as the Supplement-EZ form have been updated for the
revised project area/drainage area.
PO Box 669 Walkertown, NC 27051 336-748-0071

DocuSign Envelope ID:8FAF228D-D814-4F90-820E-972D98FE8639
BEES008CRRTER, PH.
CIVIL ENGINEERS LAND SURVEYORS
LAND PLANNING
Comment#4: "Deed Restrictions—Deed restriction information seems to be missing for Lot
19. "
Lot 19 was a scrivener's error and has been added for final recording of the deed restrictions. The
revised typical deed restrictions have been provided as an update and the final recorded deed
restrictions will be an encompassing document that will incorporate the states items along with
other planned deed restrictions and protective covenants prepared by an attorney.
Comment#5: "Clearly identify and delineate the top of banks of the streams/rivers in the main
set of plans (Section VI, 8h) and provide a callout listing the surface area of that surface water
that is within the project boundary. Note that the surface area of the surface water is the area
between the top of the banks of the streams (this may result in a need to update the Application
and Supplement-EZ). Ensure the vegetated setback is measured horizontally from the top of bank
of each side of the stream,perpendicular to the shoreline for all perennial and intermittent
surface waters within and adjacent to the site. Ensure the vegetated setbacks are clearly shown
on the main set of plans for all surface water, including surface water adjacent to the site. The
minimum vegetated setback must be 30 ft. 15A NCAC 02H.1003(4)(a), 15A NCAC
02H.1042(2)(g)(iii). Please revise as needed."
The top of banks have been surveyed and added to the plan sheets. Sheet-1.0 and C-4.0 show the
water surface areas in red shading and area callouts.
Comment#6: "Please upload plan sheet P-5 and provide the sizing/design calculations for the
riprap apron in order to demonstrate compliance with 15A NCAC 2H.1003(5): Stormwater
outlets shall be designed so that they do not cause erosion downslope of the discharge point
during the peak flow from the 10-year storm event as shown by engineering calculations.
Plan sheet P-5 is from the original engineer on the project and dates back to February 2008. This
sheet is not available in a final sealed version. I have provided the additional sheets P-4 through
P-6 the owner has been able to get from the original engineer and they are marked"Preliminary
Not for Construction". The sheets I have provided(P-1 through P-3are the final sealed sheets
provided from Forsyth County/City of Winston Salem available records. I have reviewed this
culvert which was installed in the 2008-2009 time period and can certify to the best of my
professional knowledge and based on a visit to the site on March 28, 2023 the riprap apron was
installed and I found no evidence of downslope erosion. The downslope drainageway was stable
and vegetated.
The riprap apron sizing is found near the bottom center of sheet P-6.
PO Box 669 Walkertown, NC 27051 336-748-0071

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BEESOH 8 CRRTER, PR.
CIVIL ENGINEERS LAND SURVEYORS
LAND PLANNING
I look forward to your positive review and will be available for any further details or discussion
that may be needed.
Kindest Regards,
038574
Alex Carter, PE r
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6/25/2024
PO Box 669 Walkertown, NC 27051 336-748-0071