Form_(Application) (2)

DEMLR USE ONLY
Date Received Fee Paid Permit Number
STORMWATER PERMITTING FORM 7:
MINOR MODIFICATION
Standard Permitting Program — No Fee for Minor Modification
Express Permitting Program — See Express Fee Schedule
Only complete applications packages will be accepted and reviewed. This form and the required items (with
original signatures) must be sent to the appropriate DEMLR Regional Office, which can be determined by locating
the project on the interactive online map at: http://deg.nc.govlcontactlregional-offices.
This form is to only to be used by the current permittee to notify the Division of a minor
modification. Pursuant to Rule 15A NCAC 02H .1002, a minor modification is a change to the project that:
1) does not increase the net built -upon area; and/or
2) does not change the size or design of the SCM(s). RFrF!N/E D
A. GENERAL INFORMATION
PE -I✓ 17 2020
1. State Stormwater Permit Number: SW5190701 DENR-1 Anm ni iALITY
2. Current Permit Holder's Company Name/Organization: After School, LLC STORIVIAATER PERMITTING
3. Signing Official's Name: Richard An ino
4. Signing Official's Title: Owner
5. Mailing Address: 463 % Carolina Circle
City: Winston Salem -State: NC ZIP: 27104
6. Street Address (if different):
City: _ _State: ZIP:
7. Phone: [phone] Email: team thirdwavehousing.com
8. Describe the minor modifications that you are requesting, including any revised BUA allocations (attach
additional pages or supporting tables similar to Section IV.10 of the original application, if needed):
The original proposed stormwater system was for 2 underground storage (UGS) in two locations. The
modification to the plans includes combining the UGS systems to 1 system at one of the original locations
These UGS systems were required to meet local quantity requirements and the drainage area location or
design relative to the state approved Filterra has not been modified. It should noted that upon reviewing
the sizing calculations, The Filterra Reviewers opted to provide an alternate size Filterra than the one we
had originally specified based on their review of our design and impervious surface ratio. See attached
Emails for documentation of this.
B. SUBMITTAL REQUIREMENTS
Please mark "Y" to confirm the items are included with this form. Please mark 'X" if previously provided. If not
applicable or not available, please mark N/A.:
Y 1. Two hard copies (with original signatures) and one electronic copy of this completed form.
Y 2. Two hard copies and one electronic copy of the revised plan sheets (must be a revision of the
originally approved plan sheets).
N/A 3. If there is reallocation of lot BUA, a copy of the revised recorded deed restrictions and protective
covenants OR the proposed recorded deed restrictions and protective covenants documenting
the changes and a signed agreement to provide the final recorded document.
N/A 4. If applicable, the appropriate Express review fee.
Stormwater Permit Form 7: Minor Modification Page 1 of 2 July 14, 2017

Chad Abbott
From: Sutton, Rahn <RSuttonC?conteches.com>
Sent: Wednesday, January 8, 2020 3:57 PM
To: Chad Abbott
Subject: Siler Square Project - Filterra Sizing
Attachments: Siler School Square Filterra Sizing 1-2-20.pdf
Chad,
I was asked to send this to you verifying the Filterra sizing is per the MDC ratios for media surface area to drainage
area. The charts in the MDC are based on 100% impervious drainage areas. All that the attached spreadsheet does is
weight the C factor accordingly to determine the correct sizing.
We used the info below per your 12/30/19 email:
• Proposed Drainage area to the FILTERRA = +/-17,526 (0.40 acres) (MAP ATTACHED)
0 12,302 sf (0.28 acres) impervious areas
0 4,954 sf (0.113 acres) pervious/landscaped areas
I'll give you a call shortly to confirm you got this and to see if you have any questions.
Thanks,
Rahn
L. Rahn Sutton, P.E.
Stormwater Consultant - Carolinas
Contech Engineered Solutions, LLC
Raleigh, NC 27606
Direct: 919.948.7735 Cell:919.889.0878
[e-mail]
www.ContechES.com
This email may contain confidential and/or privileged information. If you are not the intended recipient, you are hereby
notified that retention, dissemination, or copying of this communication is prohibited. If you have received this email in
error, please notify the sender by reply email and permanently delete this email and any attachments. Thank you.

CS-��A`: NTECH'
ENGINEERED SOLUTIONS
Design Engineer:
Date
Site Information
Project Name
Project State
Project Location
Drainage Area, Ad
Impervious Area, Ai
Impervious Runoff Coefficient, Ci
Pervious Area, Ap
Pervious Area Runoff Coefficient, Cp
% Impervious
Weighted Runoff Coefficient, Cw
Filterra Sizing Calculations
Filter Surface Area / Drainage Area Ratio
Required Filterra Media Surface Area,
Filterra System
Filterra Configuration
Filterra Model ID
Filterra Sizing in North Carolina
JMR r
1/2/2020 Black Cells = Calculation
Siler School Square
North Carolina
Siler City
0.40 ac
0.28 ac
0.90
0.12
0.30
70%
0.72
0.39% Per NCDEQ Manual, Chapter D.3, Table 1
55 ftz
Offline
FT 6x10 / 10x6
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