SW3170506_COMPLIANCE_20170613

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW :3 76b7�p
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
❑ HISTORICAL FILE
PiCOMPLIANCE EVALUATION INSPECTION
DOC DATE aD/y r&z
YYYYMMDD

Randall, Mike
RECEIVED
JUN 1 3 2017
From: Randall, Mike
Sent: Sunday, May 28, 2017 11:58 AM DENR-DEMLR
To: 'Casey Booth' Land Quality Section
Cc: Steve Causey; Khan, Zahid Mooresville Regional Office
Subject: Easter Creek Partners Building Submittal Request for additional Information
Attachments: Wet Pond Checklist & Calculations.doc
Casey
The Division of Energy, Mineral, and Land Resources (DELMR) received a Stormwater Management Permit Application
for the subject project on May 25, 2017. A preliminary review of that information has determined that the application is
not complete. The following information is needed to continue the stormwater review.
WET POND SPECIFIC MINIMUM DESIGN CRITERIA 2: MAIN POOL DEPTH
The average depth of the main pool shall be three to eight feet below the permanent pool elevation. The applicant shall
have the option of excluding the submerged portion of the vegetated shelf from the calculation of average depth. The
supplement Form indicates only 2.98 (insufficient)
WET POND SPECIFIC MINIMUM DESIGN CRITERIA 7: DRAWDOWN TIME
The design volume shall draw down to the permanent pool level between two and five days.
Discharge Rate = CdA [2 g Ho] A 0.5
For a 2.0 inch diameter orifice with where the Temporary Pool Elevation is 723.80 and the Permanent Pool Elevation is
722.50 and a water quality volume of 45,957 ft3
Radius = 2.0 inches/12 inches/ft = 0.0833 ft
A = 3.14 r 2 = 3.14 (0.0833) Z = 0.022 sf
Cd = 0.6
g = 32.2
Ho = (Temporary Pool Elevation -Permanent Pool Elevation) / 3 = (723.8-722.50)/3 = 0.433
Discharge Rate = 0.6 (0.022) [(64.4) (0.433)] A 0.5 = 0.07 cfs
Days to discharge = Water Quality Treatment Volume Provided 45,957 ft3 / the discharge rate 0.07 ft3/sec) / seconds
/day 86,400 = 7.6 days
It's possible that I'm mistaken. Please check your calculations for the main pool depth and drawdown time, and respond
to the request for additional information within 30 days. Attached is my checklist.
Mike Randall
Stormwater Permitting Program
NC Division of Energy, Mineral and Land Resources (DEMLR)
Land Quality Section
Stormwater Permitting
1612 Mail Service Center

Raleigh, NC 27699-1612
Office:919-807-6374
Cell: 919-389-7801
Email correspondence to and from this address may be subject to public records laws
From: Casey Booth [mailto:[e-mail]
Sent: Tuesday, May 23, 2017 2:48 PM
To: Randall, Mike <[e-mail]>
Cc: Steve Causey <[e-mail]>
Subject: Stormwater Permitting Program -- Easter Creek Partners Building Submittal
Mike
Attached is a PDF set of the plans that you will be receiving in our stormwater submittal of
the Easter Creek Partners Building project.
Please feel free to call or email me with questions/comments about our submittal.
Thank you for your time,
Casey A. Booth, EIT
Allied Design, Inc.
Firm License No. C-1891
[phone] DIRECT
[phone] OFFICE
[phone] FAX
casevralallied-enesum com
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