SW3210101_400- RTC to 1st Comments_20210324

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MCADAMS
March 17, 2021
NCIDEQ
512 N. Salisbury Street
Raleigh, North Carolina 27699
RE: The Glenns
Response to ls' Plan Review Comments
TRU-19030
RESPONSE TO COMMENTS > TRU-19030
The following are the response comments for the above -mentioned project. Our response comments are in bold.
STORMWATER PROGRAM:
Corey Anen 919.707.92000
1. Please revise the SWU-101 Application to address the following comments: a. Please enter the name and
title of the signing official for the applicant. Please note that the signing official muse be a principal
executive officer of the level of vice president or an authorized representative [15A NCAC 02H .1040(l)]. b.
Please provide documentation from the NC Secretary of State or other official documentation stating that
the signing official for the property owner meets the signatory requirements above. c. Please provide a
phone number and email address for the property owner. d. The Property Owner Authorization was not
complete. Please fill in all fields and submit a newly signed copy. e. Please complete the Applicant
Certification. This is required for all permit applications.
McAdams Response: The SWU application has been updated and the information has been provided.
2. On the existing conditions plan, please show the boundaries of all surface waters, wetlands, regulatory flood
zones, protected vegetated setbacks and protected riparian buffers or a note that none exist [15A NCAC 02H
.1042(2)(g)(iii)].
McAdams Response: A note has been added that none of these are within the property.
3. The scale on Sheet C3.00 appears incorrect. It currently says I" = 80', but appears to be at the same scale as
Sheet C2.00 (1" = 100').
McAdams Response: The scale has been updated.
4. Please show a maintenance access and easement on the design plans that meets the requirements of MIDC 8
& 9 [15A NCAC 02H.1050(8) & (9)].
McAdams Response: The maintenance and access easement have been shown for both SCMs.
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MCADAMS
RESPONSE TO COMMENTS > TRU-19030
5. Please submit an Operation Maintenance Plan and Agreement that meets the requirements of General MDC
11 and 12 [15A NCAC 02H .1050(11) & (12),.1042(2)(j)]. The O&M EZ form can be used to meet this
requirement and can be found on the Stormwater Design Manual website.
McAdams Response: The O&M has been provided.
6. Please submit a Supplement EZ form with the design data for the site. The Supplement EZ form can be found
on the Stormwater Design Manual website.
McAdams Response: The Supplement EZ form has been provided.
7. Please submit a deed restriction form [15A NCAC 02H .1003(7)]. A sample form can be found on the Post -
construction Stormwater Forms website.
McAdams Response: The deed restriction form has been provided.
8. Please address the following comments regarding the sand filter:
a. Sand Filter MDC I requires a separation distance of two feet from the bottom of the system. Please
submit a geotechnical report showing that the required separation is provided [15A NCAC 02H .1056(l)]. b.
The calculations used to size the sand filter are from an old version of the Stormwater Design Manual and do
not meet the current MDC. According to MDC 2 and 3, the sand chamber must be sized to store at least half
of the design volume below the first outlet [15A NCAC 02H .1056(2) & 3].
McAdams Response: SCM B has been converted to a wet pond and followed SCM A design/addressed
comments that pertained to SCM A.
9. Please address the following comments regarding the wet pond:
a. The stage storage calculations shown in the Stormwater Impact Analysis (Page 65 of the PDF document)
are incorrect. The table shows the contour area at El. 575 as less than at El. 574. b. The water quality
elevation and drawdown time were based on the 1-year storm event, not the I" storm event. The wet pond
must be designed based on the I" storm event. c. The forebay is only 11% of the main pool volume. Wet
pond MDC 5 requires it to be 15-20% of the main pool volume [15A NCAC 02H .1053(5)].
McAdams Response: These items have been updated for SCM A as requested.
10. Provide pdfs of all revisions, 2 hardcopies of revised plan sheets, and I hardcopy of other documents. Pdfs
must be uploaded using the form at: https:Hedocs.deq.nc.gov/Forms/SW_Project_Submittal
McAdams Response: Items have been provided and uploaded.
creating experiences through experience 2 of3

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MCADAMS
RESPONSE TO COMMENTS > TRU-19030
Consideration of this response is greatly appreciated. If you should have any questions or require additional
information, please do not hesitate to contact me at 704. 527. 0800.
Sincerely,
MCADAMS
Michael Duval, PE
Project Manager
creating experiences through experience 3 of3