SW6101105_COMPLIANCE_20200723

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW- O &5-�
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
COMPLIANCE EVALUATION INSPECTION
DOC DATE�7�
YYYYM M DD

p . %
Lawyer, Mike
From: Gordon Rose <[e-mail]>
Sent: Thursday, July 23, 2020 9:47 AM
To: Lawyer, Mike
Cc: [e-mail]; Jim Reed; Heath Wadsworth; Dan Dodd
Subject: [External] Bldg. 0-3570
Attachments: Letter Certification Bldg 0-3570 Bio_20200723.pdf
Mike,
The construction of the bio-retention basin at the Fort Bragg Range 37 Training Annex (Bldg. 0-3570) is
complete. Our certification that the construction was completed in accordance with the approved
construction documents is attached.
Should you have any questions, please do not hesitate to contact us.
Gordon A. Rose, PE, LEED AP
6
GRADIENT
LAND- WATER INNOVATION
230 Donaldson Street, Suite 500A
Fayetteville, NC 28301
Celt: 910-322-6567
Email: [e-mail]
1

6
GRADIENT
LAND -WATER INNOVATION
July 23, 2020
Michael Lawyer
NCDEQ Fayetteville Regional Office
Division of Energy, Mineral and Land Resources
225 Green Street, Suite 714
Fayetteville, NC 28301
RE: Stormwater Management Permit SW6101105 Modification
Fort Bragg Range 37 Training Annex (Building 0-3570)
Cumberland County
Dear Mr. Lawyer:
I, Gordon A. Rose, PE, as a duly licensed professional engineer in the State of North Carolina, having
been authorized to periodically observe the construction of the bio-retention basin for the treatment
of stormwater runoff from the parking lot addition for the above referenced project on Fort Bragg,
hereby state, to the best of my abilities, due care and diligence was used in the observation of the
project construction such that the construction was observed to be built within substantial
compliance and intent of the approved plans and specifications.
Please let me know if you have any questions.
Sincerely,
GRADIENT, PLLC
Gordon A. Rose, PE,, LEED AP
NC PE License No. 010763
CAR
c SEAL
10763
"0 fNQINFr!4Q:.5�.
'� N A•-0
Copy to: Lee Ward, Water Management Section Chief - Fort Bragg Directorate of Public Works
230 Donaldson Street. Suite 500A I Fayetteville, NC 28301 1 910.824.7731
127 W. Chatham Street I Cary, NC 27511 1 910.824.7731
w .gradientNC.com

Lawyer, Mike
From:
Gordon Rose <[e-mail]>
Sent:
Thursday, February 20, 2020 4:06 PM
To:
Lawyer, Mike
Cc:
Jim Reed
Subject:
[External] Bldg. 0-3570 - Fort Bragg
Attachments:
InfiltrationTrenchDocumentation REV.pdf
Mike,
Attached is revised information for the referenced project, particularly we have included additional sheets
in the Supplemental EZ form for both the existing Infiltration Trench and the proposed Bioretention Basin.
This should provide you with all the information you requested.
Should you have questions or require anything else, please let us know. Thank you.
Gordon A. Rose, PE, LEED AP
GRADIENT
LAND 'WATER ENNOVATIDN
230 Donaldson Street, Suite 500A
Fayetteville, NC 28301
Cell: 910-322-6567
Email: [e-mail]
t

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name
Fort Bragg Range 37 Training Annex
2
Pro ect Area ac
3.92
3
Coastal Wetland Areaac
0
4
Surface Water Area ac
0
5
Is this ro ect High or Low Density?
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H.1003(4)
7
Width of vegetated setbacks provided feel
N/A
8
Will the ve etated setback remain vegetated?
- Yes
9
Is BUA other that as listed in .1 0034 c-d out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMS;
11
Infiltration System
1
12
Bioretention Cell
1
13
Wet Pond
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0 '
17
Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-FS
0
20
IDisconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
Stom-Filter
0
24
Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
John Peterson, PE, Senior Civil Engineer
28
Organization:
Cromwell Architects En ineers
29
Street address:
1300 E. 6th Street
30
Cit ,State, Zi
Little Rock, AR 72202
31
Phone numbers :
501-372-2900
32
Email:
[e-mail]
Certification Statement:
'.I certify, under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or l
supervision; that the Information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and
.that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent
with the information provided
Signature of Designer
2-20-2020

DRAINAGE AREAS
1
Is this a high densit project?
Yes
2
1 If so number of drainage areas/SCMs
2
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Infiltration Trench
Bioretention Basin
5
Total BUA in project (sq ft
50721 sf
37897 sf
12824 sf
6permitting)
New BUA on subdivided lots (subject to
s f[
7permitting)
New BUA outside of subdivided lots (subject to
sf
16048 sf
3224 st
12824 sf
8
Offsite - total area (sq ft
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
- Parking (sq ft
13078 sf
304 sf
12774sf
- Sidewalks ft
490 sf
440 sf
50 sf
- Roof (so ft
2480 sf
2480 sf
- Roadway s ft
- Future (sq it)
- Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots s fl
12
New infiltrating permeable pavement outside of
subdivided lots s ft
13permitting)
Exisimg BUA that will remain (not subject to
s ft
14
Existing BUA that is already permitted (sq tt
34848 sf
34948 at
15
Existing BUA that will be removed (sq ft
175 sf
175 sf
16
Percent BUA
30%
79%
75/
17
Design storm inches
1 in
1 in
1 in
18
Design volume of SCM cu ft
3314 of
1033 of
19
Calculation method for design volume
Simple Method
Simple Method
ADDITIONAL INFORMATION
20
Pleause this space to provide any additional information about the
drainase ge area(s):

INFILTRATION SYSTEM
21
Was the sail investigated in the footprint and at the elevation of the infiltration
system?
Yes
22
SHWT elevatien(fmsl)
320.00
23
Depth to SHWT per soils report (in)
240.00
24
Ground elevation at boring in soils report (fmsl)
340.00
25
Is a detailed hydrogeologic study attached if the separation is between 1 and 2
feet?
26
Soil infiltration rate (in/hr)
1.75
27
Factor of safety (PS) (2 is recommended):
2.00
Elevat7ons
29
Bottom elevation (fmsl)
327 tt
30
IStorage elevation (fmsl)
334.5 ft
31
jBypass elevation (fmsl)
334.75 ft
Infiltration - 1 2:06 PM 2/20/2020

BIORETENTION CELL
1
Drainage area number
2
2
Design volume of SCM (cu ft)
1504 of
GENERAL
MOC FROM 021
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered side
slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erasion (10.
year storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the design
volume?
Yes
9
What is the method for dewatering the SCM for maintenance?
Other
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
12
Does the drainage easement comply with General MDC (9)9
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
14
Is there an 08M Agreement that complies with General MDC (11)?
Yes .
15
Is there an 08M Plan that complies with General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designedy an NG icense pro essiona .
es
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
351.00
19
Bottom of the bioretention cell (fmsl)
353.50
20
Ponding depth of the design storm (inches)
11 in
21
Surface area of the bioretention cell (square feet)
1430 sf
22
Design volume of the bioretention cell (cubic feet)
1504 cf
23
Is the bioretention cell used for peak attenuation?
Yes
24
Depth of peak attenuation over planting surface (in)
12 in
25
Height of peak attenuation outlet above the planting surface (in)
11 in
26
Infiltration rate of the in situ soil (inch/hour)
2 in/hf
27
iDiameter of the underdrain pipes (if applicable)
6 in
28
Does the design include Internal Water Storage (IWS)?
No
29
if so, elevation of the top of the IWS (fmsl)
30
Elevation of the planting surface (fmsl)
356.5
31
What type of vegetation will be planted? (grass, trees/shrubs, other)?
Grass
32
Media depth (inches)
24 in
33
Percentage of medium to coarse washed sand by volume
75-85
34
Percentage of fines (silt and clay) by volume
8-10
35
Percentage of organic matter by volume
5-10
36
Type of organic material
Pine Bark Fines
37
Phosphorus Index (P-Index) of media (unitless)
<50
38
Will compaction be avoided during construction?
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
40
Depth of mulch, If applicable (inches)
41
Type of mulch, if applicable
42
How many clean out pipes are being installed?
2
43
1 ype of pretreatment that will be use
Ip ap are ay
ADDITIONAL INFORMATION
44 �Please use this space to provide any additional information about the
bioretention cell(s):
Bioretention 1 1:27 PM 2/20/2020

Patterson, Robert
From:
Patterson, Robert
Sent:
Friday, January 07; 2011 8:16 AM
To:
'[e-mail]'
Cc:
'[e-mail]'
Subject:
SW Permit - Fort Bragg SOF Range 37 Training Annex - Additional Information Request
Attachments:
01-07-2011. pdf
John,
Below is to follow up with what we discussed yesterday on the phone regarding the subject project. I do want to
mention again that the application package overall was refreshingly good quality. I have also attached my quick
calculations and notes for your use.
Please provide the following additional information:
1. The Simple Method must be used to calculate the minimum required treatment volume for the 1.0" design
storm. See 3.3.1 of the BMP Manual.
2. Although an overflow is provided on the downstream end of the infiltration trench; a bypass at the inlet to the
infiltration trench must be provided" to bypass storms in excess of the 1.0" design storm.
3. A vegetated filter strip (VFS) was not provided for the bypassed storms from the infiltration trench, but is
required`.
"The bypass and/or VFS requirement for infiltration devices may be waived by increasing the size of the
infiltration device. Ple, se see 16.3.9 in the BMP Manual for specific sizing requirements.
Please note that this request for additional information is in response to a preliminary review. The requested
information should be received by this Office prior to February 7, 2011, or the application will be returned as
incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee.
If you need additional time to submit the information, please mail, fax, or email your request for a time extension to the
Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you
expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application
to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation
Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-
215.6A.
If you have any questions concerning this matter please feel free to contact me at [phone],,or
robert.patterson(@ncdenr.gov.
Sincerely,
Robert D. Patterson, PE
Environmental Engineer
NCDENR I DWQ I Stormwater Permitting
1617 Mail Service Center, Raleigh, NC 27699-1617 (Mail)
512 N. Salisbury St, Raleigh, NC 27604 1 9� Floor (Location & Parcels)
[phone] Phone [phone]LS I Robert. Pattersonapcdenr. go Email
Welisite.: http://portal.ncdenr.org/weblwq/ws/su

,; Before printing this email, please consider your budget and the environment.
E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties.
2

Patterson, Robert
From: Patterson, Robert
Sent: Friday, January 07, 2011 9:07 AM
To: '[e-mail]'
Subject: FW: SW Permit - Fort Bragg SOF Range 37 Training Annex - Additional Information Request
John,
I forgot to mention that the calculations need to sealed, signed, and dated. You only need to resubmit items that get
revised, not a whole new package.
Thanks.
Robert
From: Patterson, Robert
Sent: Friday, January 07, 2011 8:16 AM
To: '[e-mail]'
Cc: '[e-mail]'
Subject: SW Permit - Fort Bragg SOF Range 37 Training Annex - Additional Information Request
John,
Below is to follow up with what we discussed yesterday on the phone regarding the subject project. I do want to
mention again that the application package overall was refreshingly good quality. I have also attached my quick
calculations and. notes for your use.
Please provide the following additional information:
1. The Simple Method must be used to calculate the minimum required treatment volume for the 1.0" design
storm. See 3.3.1 of the BMP Manual.
2. Although an overflow is provided on the downstream end of the infiltration trench; a bypass at the inlet to the
infiltration trench mustbe'provided" to bypass storms in excess of the 1.0" design storm.
3. A vegetated filter strip (VFS) was not provided for the bypassed storms from the infiltration trench, but is
required".
"The bypass and/or VFS requirement for infiltration devices may be waived by increasing the size of the
infiltration device. Please see 16.3.9 in the BMP Manual for specific sizing requirements.
Please note that this request for additional information is in response to a preliminary review. The requested
information should be received by this Office prior to February 7, 2011, or the application will be returned as
incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee.
If you need additional time to submit the information, please mail, fax, or email your request for a time extension to the
Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you
expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application
to issue the permit.