SW6110204_COMPLIANCE_20190225

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

TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS,
February 25,2019
ONUS Bldg N-6307 Laydown Yard Addition SCM Inspection
Fort Bragg, Fayetteville, NC 28310
RE: SCM Investigation and Assessment
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Per a request to certify a Stormwater Control Measure (SCM) constructed at Fort Bragg,
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NC, Timmons Group, Inc. has inspected the SCM located at ONUS Bldg N-3607. The
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inspection was conducted on February 14, 2019. Based on initial inspection the SCM appeared
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to be functioning as an underground dry detention chamber.
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The site appears to be a gravel laydown yard for maintenance vehicles on base. There is a
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storage building at the upstream end of the laydown yard. The gravel in the laydown yard
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appears to be compacted ABC stone. There is a Swale on the south side of the laydown yard
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that a majority of the stormwater collects prior to entering the underground detention chamber.
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There are several grated inlets on site that capture stormwater runoff and direct it to the
underground detention chamber. There are also several manholes on site that are associated
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with the underground chamber and the storm stormwater system, There are observation ports
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also located along one of the underground chambers. It is noted that these ports appeared to be
covered by the stone and uncovered just prior to our visit. The location of these manholes and
grated inlets appear to be consistent with the construction plans.
At the time of our inspection, grated inlets seemed to be clear of debris and were
functioning properly. It is noted that there were some grated inlets at the western portion of
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the site were not capturing very much drainage, however they did appear to comply with the
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construction plans. Manholes were inspected as well and seemed to be of sound construction
and functioning properly. Flow splitter devices within these manholes were noted and seemed
to be functioning properly. The observation ports were pulled and inspected as well. It is
noted that given the size of these inspection ports and the size of the underground detention
device, a pipe camera system would need to be utilized in order to determine the state of the
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underground portion of this device that is not accessible due to size. All observation within this
report was done via access to manholes and the visible portions accessible by traditional means.
During the inspection, we spoke with those who used the site and were familiar with the
area, and there have been no reports nor issues with stormwater since the system was installed.
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It was noted that most do not realize there is a device underground at the site, which can often
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be the case with underground detention systems.
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Based on our inspection, it appears that the underground detention chamber is functioning
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properly.
Thank you for letting us assist you with this matter. If you need additional information
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or have any questions concerning this letter please do not hesitate to contact us.
Timmons Group, Inc.
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Brandon L McLamb, PE
NC Reg. No. 34374

TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS
VICINITY MAP
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LOCATION MAP
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TIMMONS GROUP
YOUR VISION ACHIEVED THROUGH OURS,
Orange cone represents splitter box manhole location
Underground detention chamber pipes on the other side of a splitter box weir
Site.

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TIMMONS GROUP
Splitter box weir inside manhole that separates overflow drainage and detention chamber
Uncovered observation port

TIMMONS GROUP
Offsite drainage that enters into the pipe system and bypasses underground detention chamber.
This is the view from the back of the building (west side of the gravel parking lot)

Lowther, Brian
From: Lowther, Brian
Sent: Wednesday, February 23, 2011 2:28 PM
To: '[e-mail]'
Subject: Additional Information Request for ONUS Service Center - SW6110204
Dear Mr. Dreitzler
The Division of Water Quality Central Office received a Stormwater Management Permit Application for the subject
project on February 4, 2011. A preliminary review of that information has determined that the application is not
complete. The following information is needed to continue the stormwater review:
1. On the landscaping plan, please include the total amount of trees, shrubs, and herbaceous plants that will be
planted in the bioretention cell and include the size, spacing, and location of the plantings on the plan sheets.
Also, please include a planting detail and source of nursery for the plants.
2. On plan sheet C-4, please change the detail from Stormwater Pond to Bioretention Cell.
3. Please include a detail for the overflow structure.
4. Surface Area is listed as 6,557.0 but the volume is 6,919.0 with a depth of 12 inches. Please include calculations
for the volume.
5. Please make sure to include all applicable items from the Required Items Checklist. Some of the missing items
include cell dimensions and recorded drainage easement and public right of way.
The requested information should be received by this Office prior to March 11, 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 send your request, including date by which you expect to
submit the required information, to my attention. The Division is allowed 90 days from the receipt of a completed
application to issue the permit. i .o' ; �
Please reference the State assigned project number on all correspondence. New original documents must be provided
and copies are not acceptable. If you have any questions concerning this matter feel free to contact me at (919) 807-
6368 or [e-mail].
Brian C. Lowther
Environmental Engineer
NCDENR I DWQ I Stormwatcr Permitting Unit
1617 Mail Service Center, Raleigh, NC 27699-1617
512 N. Salisbury St, Raleigh, NC 27604
Phone: [phone]
Email: brian.lowthcr(ci�ncdcnr.gov
Website: httu://portal.nedenr.orV/web/wq/ws/su
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. >1 j.t?:
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Lawyer, Mike
From: Blake Hall <[e-mail]>
Sent: Wednesday, March 27, 2019 10:36 AM
To: Lawyer, Mike
Cc: [e-mail]; Brandon McLamb, Adam Carroll
Subject: [External] SW6110204
Attachments: SCM Cent Page 6.pdf; SCM Cert Page 5.pdf; 2019 SCM Assessment - Onus Service
Yard.pdf; SW6110204 Modification -ONUS Service Center.pdf
Mike,
Please find the attached SCM certification for SW6110204. This is an old permit that we were recently informed that was
never closed out. Please let me know if you have any questions or if you need any additional information.
Thank you,
Blake
Blake Hall, PLA, PE, LEED AP BD+C
Principal
TIMMONS GROUP I www.timmons.com
5410 Trinity Road, Suite 102 1 Raleigh, NC 27607
Office: 919.866.4933 Fax: [phone]
Mobile: [phone] blake.hall(a)timmons.com
Linkedln: www.linkedin.com/in/wblakehall
Your Vision Achieved Through Ours
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