SW3170304_COMPLIANCE_20170926

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATEc�l7D9a��
YYYYMMDD

cal" l"17
Shaping the Future
August 15, 2017
mshi� �a •p� ��!
Mr. Robert D. Patterson, PE
OR LP
North Carolina Department of Environmental Quality oC,
Storm Water Permitting Program
512 N. Salisbury Street oP
1612 Mail Service Center
Raleigh, NC 27699-1612
Re: Response to Comments —Addington Crossing Subdivision - Permit No. SW3170304
Mr. Patterson:
Cardno is pleased to provide the attached Addendum No. 3 to the Storm Water Management Plan
for Addington Crossing Subdivision. The addendum includes a response to comments provided by
your office dated June 26, 2017. The comments from the above referenced letter have been
reproduced below and addressed as follows:
✓1. Provide the missing signed and sealed cover page for the supplement form.
An original copy of the signed supplement form has been provided as an attachment to this
correspondence.
/
IL. Provide the missing signed and notarized cover page for the O&M agreement to show the
revision from the dry basins to bioretention cells.
9800 Southern Pine Boulevard
Suite I
Charlotte, North Carolina 28273
Phone [phone]
Fax [phone]
w .cardno.conn
An original copy of the signed and notarized O&M agreement has been provided as g@
attachment to this correspondence.
✓3 Revise the DA sizes in part IV.10 on SWU-101 to be consistent with the calculations. /;U G'18 ©�O
The drainage area sizes have been revised. A copy of the revised SWU-101 form �ye�jn, ? r
provided as an attachment to this correspondence. �Pk A1/
/ �9TFRp
d. Provide a soils report that shows the SHWT elevations at each SCM per bioretention N
MDC1. G
A copy of the original geotechnical letter detailing the SHWT levels have been included as an
attachment to this correspondence.
Revise C-509-512 to specify "washed" stone for around the underdrains.
The details have been revised as requested.

r
Page 2
August15,2017
In addition to the response to comments above, several items related to the SWMP have been
revised. These revisions were based upon feedback from other review entities. These revisions
include the following:
• Minor revisions have been made to the proposed basin maps to adjust a couple of areas
not being routed correctly. There were also a couple of revisions to the Tc values for
several basins. The revisions are as follows:
- Increased Basin A due to bypass swale.
- Decreased Basin E due to bypass swale.
- Adjusted the Tc of Basin E due to there no longer being channel flow just before the
basin and also due to the reduction in basin area.
- Adjusted the Tc of Basin L due to there no longer being channel flow just before the
basin.
• Detention calculations have been revised to show the volume of the pond beginning at
ground level and disregarding the media storage volume as well as the volume of the
rock berm separating the forebay. The effects from exfiltration and underdrains have
also been disregarded.
• There have been several storm drain inlets that have been added to the project to help
reduce several areas of high spread.
• The twin 60 inch culvert crossing has been revised to reflect the change in hydrology
mentioned above.
If you have any questions or need any additional information pertaining to the response to
comments, please do not hesitate to contact me.
Since
pert Cash, PE
Project Manager
Cardno INC) Inc.
Enclosures
Shaping the Future

Patterson, Robert D
From:
Robert Cash <[e-mail]>
Sent:
Thursday, August 10, 2017 4:23 PM
To:
Patterson, Robert D
Cc:
Ashton Bowman; Jamie Williams
Subject:
RE: SW3170304 - Addington Crossing - Request for Add. Info.
Robert,
Sorry for the delay in our resubmittal. Tom is no longer at Cardno and we did not realize that he had not made the
resubmittal. We will go through the package and submit to you asap.
Please contact me with any questions from here on.
Thanks,
Robert Cash, PE
PRACTICE GROUP LEADER
CARDNO
Direct [phone]
Cell [phone]
Address 9800 Southern Pine Boulevard Suite I, Charlotte, NC 28273
Email robert.cash(o)cardno.com Webwww.cardno.com
This email and its attachments may contain confidential and/or privileged information for the sole use of the intended recipient(s). All electronically supplied data
must be checked against an applicable hardcopy version which shall be the only document which Cardno warrants accuracy. If you are not the intended recipient,
any use, distribution or copying of the information contained in this email and its attachments is strictly prohibited. If you have received this email in error, please
email the sender by replying to this message and immediately delete and destroy any copies of this email and any attachments. The views or opinions expressed
are the author's awn and may not reflect the views or opinions of Cardno.
From: Patterson, Robert D Imailto:[e-mail]]
Sent: Thursday, August 10, 2017 2:43 PM
To: Thomas Kelley <[e-mail]>
Subject: RE: SW3170304 - Addington Crossing - Request for Add. Info.
Thomas— What is the status of this? I cannot grant anymore extensions. I'll need to return the application if the add.
Info. is not received in the next few days. Thanks.
Robert D. Patterson, P.E.
Environmental Engineer
919-807-6369 1 Robert.Patterson(dncdenr.gov
httos://deg.nc.gov/about/divisions/energy-mineral-land-resources/stormwater
NC Dept. of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612

Email correspondence to and from this address is subject to the North Carolina Public Records Law and maybe disclosed to third parties.
From: Thomas Kelley [mailto:thomas.kellev@cardno comJ
Sent: Wednesday, July 26, 2017 2:40 PM
To: Patterson, Robert D <[e-mail]>
Subject: RE: SW3170304 - Addington Crossing - Request for Add. Info.
Robert,
We received a couple of comments from the local review entity that has resulted in a couple of minor revision to the
SWMP. We are preparing the revisions and will address them in our response correspondence. We are preparing a
response package and should be overnighting it to you tomorrow. Please allow a couple of days extension of the July
26th response date.
Sincerely,
Thomas Kelley, PE
SITE CIVIL SR. PROJECT MANAGER
CARDNO
Direct [phone]
Address 9800 Southern Pine Boulevard, Suite I, Charlotte, North Carolina 28273
Email thomas.kellev(a)cardno.com Web www.cardno.com
This email and its attachments may contain confidential and/or privileged information for the sole use of the intended recipient(s). All electronically supplied data
must be checked against an applicable hardcopy version which shall be the only document which Cardno warrants accuracy. If you are not the intended recipient,
any use, distribution or copying of the information contained in this email and its attachments is strictly prohibited. If you have received this email in error, please
email the sender by replying to this message and immediately delete and destroy any copies of this email and any attachments. The views or opinions expressed
are the author's own and may not reflect the views or opinions of Cardno.
From: Patterson, Robert D[mailto:[e-mail]
Sent: Monday, June 26, 2017 3:20 PM
To: Thomas Kelley <[e-mail]>
Cc: Robert Cash <[e-mail]>
Subject: SW3170304 - Addington Crossing - Request for Add. Info.
Thomas — Please see attached; and let me know if you have any questions. Thanks.
Robert D. Patterson, P.E.
Environmental Engineer
919-807-6369 1 Robert.Pattersonrdncdenr.eov
https://deg.nc.gov/about/d ivisions/enerev-minera I -la nd-resources/stormwater
NC Dept. of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612
Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties.

Patterson, Robert D
From: Patterson, Robert D
Sent: Wednesday, July 26, 2017 2:42 PM
To: 'Thomas Kelley'
Subject: RE: SW3170304 - Addington Crossing - Request for Add. Info.
That's fine. Thanks for the update
Robert D. Patterson, P.E.
Environmental Engineer
919-807-6369 1 Robert.Patterson(ancdenr.gov
httos://deg.nc.gov/about/divisions/energy-mineral-la nd-resources/stormwater
NC Dept. of Environmental Quality
DEMLR Stormwater Program -
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612
Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties.
From: Thomas Kelley[mailto:[e-mail]]
Sent: Wednesday, July 26, 2017 2:40 PM
To: Patterson, Robert D <[e-mail]>
Subject: RE: SW3170304 - Addington Crossing - Request for Add. Info.
Robert,
We received a couple of comments from the local review entity that has resulted in a couple of minor revision to the
SWMP. We are preparing the revisions and will address them in our response correspondence. We are preparing a
response package and should be overnighting it to you tomorrow. Please allow a couple of days extension of the July
26th response date.
Sincerely,
Thomas Kelley, PE
SITE CIVIL SR. PROJECT MANAGER
CARDNO
Direct [phone]
Address 9800 Southern Pine Boulevard, Suite I, Charlotte, North Carolina 28273
Email thomas.kelleyCa)cardno.com Web www.cardno.com
This email and its attachments may contain confidential and/or privileged information for the sole use of the intended roripienl(s). All elerlionically supplied data
must be checked against an'applicable hardeopy version which shall be the only document which Cardno warrants accuracy. If you are not the intended recipient,
any use, distribution or copying of the information contained in this email and its attachments is strictly prohibited. If you have received this email in error, please
email the sender by replying to this message and immediately delete and deshoy any copies of this email and any attachments. The views or opinions expressed
are the author's own and may not reflect the views or opinions of Cardno.

From: Patterson, Robert D[mailto:[e-mail]]
Sent: Monday, June 26, 2017 3:20 PM
To: Thomas Kelley <[e-mail]>
Cc: Robert Cash <[e-mail]>
Subject: SW3170304 - Addington Crossing - Request for Add. Info.
Thomas — Please see attached; and let me know if you have any questions. Thanks.
Robert D. Patterson, P.E.
Environmental Engineer
919-807-6369 1 [e-mail]
https://deg. nc.gov/a bout/divisions/energy-mineral-land-resources/stormwater
NC Dept. of Environmental Quality
DEMLR Stormwater Program
512 N. Salisbury St.
1612 Mail Service Center
Raleigh, NC 27699-1612
Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties.

1�
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May 25, 2017 ��FG%�=.�cn ��lJ
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Mr. Robert D. Patterson, PE ��6°1/0, 00,�o
North Carolina Department of Environme6j,. Quality
Storm Water Permitting Program ��B
512 N. Salisbury Street
1612 Mail Service Center
Raleigh, NC 27699-1612
�RECENFO
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Re: Response to Comments —Addington Crossing Subdivision - Permit No. SW3170304
Mr. Patterson:
Ca�AQ�BTJ®'
Shaping' the, Future
Cardno is pleased to provide the attached Addendum No. 1 to the Storm Water Management Plan
for Addington Crossing Subdivision. The addendum includes a response to comments provided by
your office dated March 27, 2017. The comments from the above referenced letter have been
reproduced below and addressed as follows:
Y Please provide a copy of the JD from USACE.
A request for jurisdictional determination has been prepared and is awaiting approval from
USACE. Upon receipt of the approval, a copy will provided under a separate cover.
�2�On SWU-101 item IV.10, complete the table with all DA and impervious area information.
Section SWO-101 item IV.10 has been revised to include the drainage area and impervious
information as requested. The revised page of the form been provided as an attachment to
this correspondence.
13 The person signing the applications, deed restrictions, and 0&M agreement must be an officer
of the company as listed on the NC Sec. of State's website. Or provide a signed letter for one
of the officers listed giving Brian Johnson signature authority.
Information indicating the Mr. Brian Johnson has signature authority has been provided as
an attachment to this correspondence.
4z Remove the "Preliminary— Not for Construction" note on the plans. Plans for the permit must
be final plans.
Noted. The note "Preliminary — Not for Construction" has been removed as requested.
Fill-in the max BUA for each lot on the deed restrictions form. S u f3^t (T (04C7'
The BUA has been added to the deed restrictions form. The revised page of the form has
been provided as an attachment to this correspondence.
LV( The 0&M Agreement is missing pages that show the maintenance table and SCM maintenance
details.
Pages addressing the maintenance table and SCM maintenance details have been included
with this correspondence.
9800 Southern Pine Boulevard
Suite I
Charlotte, North Carolina 28273
Phone [phone]
fax [phone]
w .cardnoxom

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May 25, 2017
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0ince the project proposes handling runoff predominantly using storm drainage piping, SCM's
and is not dispersing flow, it must meet all of the high density requirements and MDC's in the
SCM Design Manual and the revised 2017 rules. Revise the SCM's to be from the list of primary
SCM's to treat the water quality volume (1" ). Dry pools are secondary SCM's. Provide
supporting calculations for the SCM water g4plity designs.
Considering that rural nature of the watershed and the very small percentage of impervious
areas that will be added due to our project we are proposed a LID approach to water quality.
A Storm-EZ for has been provided for the project that indicates water quality treatment
volume matching has been achieved. A significant portion of the project area is being
considered disconnect based upon recommendations from NCDEQ staff.
�Submit supplement forms for the SCMs. The new Supplement EZ can be found on our website:
https:Hdeg.nc.gov/about/divisions/energy-land-resources/ebergy-mineral-land-permit-
guidance/stormwater-bmp-manual
Supplement EZ forms have been completed and included with this correspondence. Due to
the fact that the Treatment Swales are in series with the Dry Ponds and that they were not
designed for any particular drainage area, supplement forms for the swales have not been
provfde a Disconnected impervious areas were designated such due to the fact that the
runoff will be transported by vegetated zones towards protected stream buffers prior to
entry into the intermittent streams. There is no associated SCM designed for this
disconnected runoff, therefore supplement forms have not been provided.
t9�/The calculations must be sealed, signed and dated.
Copies of the calculations that have been signed, sealed and dated have been provided as
/an attachment to this correspondence.
M. The proposing LID per page 5-4 of the SMP, you must submit the Storm-EZ form and show
volume matching.
Storm EZ forms have been completed and are provided as an attachment to this
correspondence.
&Due to the nature of the above comments, additional comments may be forthcoming once
revisions are submitted.
Noted.
In addition to the response to comments above, the plans and calculations have been revised to
incorporate comments from other agencies. The response to the comments resulted in minor
changes in drainage areas and the storm sewer system. The plan sheets and calculations provided
with this correspondence reflect the minor changes.
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Shaping the Future
Page 3
May 25, 2017
If you have any questions or need any additional information pertaining to the response to
comments, please do not hesitate to contact me.
Sincerely,
Thomas Kelley, PE
Senior Project Manager
Cardno (NC) Inc.
Enclosures
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Patterson, Robert D
From: Thomas Kelley <[e-mail]>
Sent: Thursday, May 11, 2017 2:40 PM
To: Patterson, Robert D
Subject: RE: Addington Crossing Subdivision - Request for Stormwater Permit no. SW3170304
Robert,
I wanted to request an additional extension of one week to allow us to fully prepare a proper response to comments for
the SWMP. We have incorporated some design changes based upon comments from other agencies and would like to
have the design change complete prior to our resubmittal. Please extend the deadline for submittal to May 19, 2017.
Sincerely,
Thomas Kelley, PE
SITE CIVIL SR. PROJECT MANAGER
CARDNO
Direct [phone]
Address 9800 Southern Pine Boulevard, Suite I, Charlotte, North Carolina 28273
Email thomas.kelley(o)cardno.com Web www.cardno.com
This email and its attachments may contain confidential and/or privileged information for the sole use of the intended recipient(s). All electronically supplied data
must be checked against an applicable hardcopy version which shall be the only document which Cardno warrants accuracy. If you are not the intended recipient,
any use, distribution or copying of the information contained in this email and its attachments is strictly prohibited. If you have received this email in error, please
email the sender by replying to this message and immediately delete and destroy any copies of this email and any attachments. "Ihe views or opinions expressed
are the author's own and may not reflect the views or opinions of Cardno.
From: Patterson, Robert D [mailto:[e-mail]]
Sent: Wednesday, April 26, 2017 2:49 PM
To: Thomas Kelley <[e-mail]>
Cc: Ashton Bowman <[e-mail]>; Robert Cash <[e-mail]>
Subject: RE: Addington Crossing Subdivision - Request for Stormwater Permit no. SW3170304
Thomas —Sounds good. Thanks.
Robert D. Patterson, P.E.
Stormwater Engineer
NCDEQ I DEMLR I Stormwater Permitting Program
919-807-6369 1 Robert. Patterson Ancdenr.eov
512 N. Salisbury St. I Raleigh, NC 27604
1612 MSC I Raleigh, NC 27699-1612
http://portal.ncdenr.org/web/Ir/stormwater
Email correspondence to and from this address is subject to the North Carolina Public Records Low and may be disclosed to third parties.
From: Thomas Kelley [mailto:[e-mail]]
Sent: Wednesday, April 26, 2017 2:29 PM

To: Patterson, Robert D <robert.patterson([e-mail]>
Cc: Ashton Bowman <Ashton. Bowman@ca rd no.co m>; Robert Cash <Robe rt.Cash(a)ca Ind no.com>
Subject: Addington Crossing Subdivision - Request for Stormwater Permit no. SW3170304
Robert,
I will like to formally submit a request for an extension of time for submittal of a response to comments for the above
referenced project. We anticipate providing a response next week, but to be safe if you could provide an extension
through May 12, 2017, it would be most appreciated.
Sincerely,
Thomas Kelley, PE
SENIOR PROJECT ENGINEER
CARDNO
Direct +t 704 927 9700
Address 9800 Southern Pine Boulevard, Suite I, Charlotte, North Carolina 28273
Email thomas.kelley(a)cardno.com Web www.cardno.com
CONNECT WITH CARDNO R g
This email and its attachments may contain confidential and/or privileged information for the sole use of the intended recipient(s). All electronically supplied data
must be checked against an applicable hardcopy version which shall be the only docurnenl which Cardno warrants accuracy. If you are riot the intended recipient,
any use, distribution or copying of the information contained in this email and its attachments is strictly prohibited. If you have received this email in error, please
email the sender by replying to this message and immediately delete and destroy any copies of this email and any attachments. The views or opinions expressed
are the author's own and may not reflect the views or opinions of Cardno.