RE Request for clarification

Riddle, Rick L
From:Randall, Mike
Sent:Friday, February 13, 2015 10:35 AM
To:'Tristan McMannis'; Cisco Garcia ([e-mail])
Subject:RE: Request for clarification
Attachments:201502131025.pdf
Dear Mr. Garcia:

The Division of Energy, Mineral, and Land Resources (DELMR), received a complete Stormwater Management Permit
Application for the subject project on February 11, 2015. Staff review of the plans and specifications has determined
that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and
Session Law 2006-246. We are forwarding Permit No. SW3150202, dated February 13, 2015, for the construction,
operation and maintenance of the subject project and the wet pond. This permit shall be effective from the date of
issuance until February 12, 2023, and shall be subject to the conditions and limitations as specified therein, and does not
supersede any other agency permit that may be required.

Attached for your records is the electronic copy for your files. Originals are being mailed out.

This project will be kept on file at the Mooresville Regional Office. If you have any questions, or need additional
information concerning this matter, please contact Mike Randall at [phone]; or [e-mail].

Mike Randall
Stormwater Permitting Program
NC Division of Energy, Mineral and Land Resources (DEMLR)
1617 Mail Service Center
Raleigh, NC 27699-1617

Office: 919-807-6374
Cell: 919-389-7801

Email correspondence to and from this address may be subject to public records laws

From: Tristan McMannis \[mailto:[e-mail]\]
Sent: Friday, February 13, 2015 10:21 AM
To: Randall, Mike
Subject: RE: Request for clarification

Hi Mike,

We routed the WQv through the pond to check the drawdown (please see attached PDFs). When we routed the WQv
we found that due to the large surface area the WQv actually did not stage up very high on the orifice and so the release
rate was small, but drawn out as there wasn’t much head to drive the flows. The larger orifice was partially selected to
help control the other storm events for detention, and trying to keep them from staging up too high relative to the top
of embankment.

I don’t have information on the SHWT, but we will make sure the contractor is aware a liner may be needed in this
situation.

Please let me know if you need anything else.
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Best regards,

Tristan McMannis, RLA, ASLA, LEED® AP BD+C

engineering · surveying · planning

3475 Lakemont Blvd.
Fort Mill, SC 29708
www.espassociates.com
[phone] (Phone)
[phone] (Direct)
[phone] (Mobile)
[phone] (Fax)

The information contained in this e-mail message is confidential and may be legally privileged and is intended only for the use of the individual or entity named above. If you are not
an
intended recipient or if you have received this message in error, you are hereby notified that any dissemination, distribution or copy of this e-mail is strictly prohibited. If you have
received
this e-mail in error, please immediately notify us by return e-mail or telephone if the sender's phone number is listed above, then promptly and permanently delete this message. Please

note that any attached electronic files are furnished for your information only. This should be considered as an interim work product and is subject to continued modification and revision.

This is not a construction document. Construction documents with the appropriate seal, signed and dated, can be provided if necessary. Any use of this electronic file including modification,

insertion, or appendage to other documents is at the user's risk. Any reproduction or distribution of this information requires written authorization from ESP Associates, P.A.

From: Randall, Mike \[mailto:[e-mail]\]
Sent: Friday, February 13, 2015 9:50 AM
To: Tristan McMannis
Subject: Request for clarification

Tristan

Pursuant to 15A NCAC 02H .1008 (e)(2) The discharge rate …… shall be such that the draw down to the permanent
pool level occurs within five days, but not in less than two days. Please check your calculations. I came up with
about a 6 hour draw down. The 8 inch diameter orifice is larger than I normally see.

My calculations:

Discharge Rate = Coda \[2 g Ho\] ^ 0.5
For a 8.0 inch diameter orifice
r = 4.0 inches/12 inches/ft. = 0.333 ft.
2 2
A = 3.14 r= 3.14 (0.333) = 0.348 so
Cd = 0.6
g = 32.2
Ho = (Temporary Pool Elevation-Permanent Pool Elevation) / 3 = (593.20-590.50)/3 = 2.7
Discharge Rate = 0.6 (0.348) \[(64.4) (2.7)\] ^ 0.5 = 2.753 cuffs
3
Water Quality Treatment Volume Provided: 58,539 ft
33
(58,539 ft/2.7 ft/sec) / 86,200 seconds/day =0.25 days

Also, although not required by DENR rules, in order to function properly DENR recommends the permanent pool
elevation be within 6 inches (plus or minus) of the SHWT elevation. Can you confirm the SHWT is within 6 inches of the
Permanent Pool Elevation (590.50)? Otherwise you may end up lining the pond which can be expensive.

2

Mike Randall
Stormwater Permitting Program
NC Division of Energy, Mineral and Land Resources (DEMLR)
1617 Mail Service Center
Raleigh, NC 27699-1617

Office: 919-807-6374
Cell: 919-389-7801

Email correspondence to and from this address may be subject to public records laws

3

From: Tristan McMannis \[mailto:[e-mail]\]
Sent: Wednesday, February 11, 2015 5:24 PM
To: Randall, Mike
Subject: Deeds for Amber Meadow

Hi Mike,

We sent the Amber Meadow subdivision in for review the other day, and in the transmittal I mentioned the deeds would
be sent under separate cover with the Joinder agreement. Attached you will find PDFs of the deeds, and the joinder
agreements from Longview South. Let me know if you have any questions or require any additional information. Thanks
for your time.

Best regards,

Tristan McMannis, RLA, ASLA, LEED® AP BD+C

engineering · surveying · planning

3475 Lakemont Blvd.
Fort Mill, SC 29708
www.espassociates.com
[phone] (Phone)
[phone] (Direct)
[phone] (Mobile)
[phone] (Fax)

The information contained in this e-mail message is confidential and may be legally privileged and is intended only for the use of the individual or entity named above. If you are not
an
intended recipient or if you have received this message in error, you are hereby notified that any dissemination, distribution or copy of this e-mail is strictly prohibited. If you have
received
this e-mail in error, please immediately notify us by return e-mail or telephone if the sender's phone number is listed above, then promptly and permanently delete this message. Please

note that any attached electronic files are furnished for your information only. This should be considered as an interim work product and is subject to continued modification and revision.

This is not a construction document. Construction documents with the appropriate seal, signed and dated, can be provided if necessary. Any use of this electronic file including modification,

insertion, or appendage to other documents is at the user's risk. Any reproduction or distribution of this information requires written authorization from ESP Associates, P.A.

The information contained in this e-mail message is confidential and may be legally privileged and is intended only for the use of the individual or entity named above. If you are not
an
intended recipient or if you have received this message in error, you are hereby notified that any dissemination, distribution or copy of this e-mail is strictly prohibited. If you have
received this
e-mail in error, please immediately notify us by return e-mail or telephone if the sender's phone number is listed above, then promptly and permanently delete this message. Please note
that any
attached electronic files are furnished for your information only. This should be considered as an interim work product and is subject to continued modification and revision. This is
not a
construction document. Construction documents with the appropriate seal, signed and dated, can be provided if necessary. Any use of this electronic file including modification, insertion,
or
appendage to other documents is at the user's risk. Any reproduction or distribution of this information requires written authorization from ESP Associates, P.A.
The information contained in this e-mail message is confidential and may be legally privileged and is intended only for the use of the individual or entity named above. If you are not
an
intended recipient or if you have received this message in error, you are hereby notified that any dissemination, distribution or copy of this e-mail is strictly prohibited. If you have
received this
e-mail in error, please immediately notify us by return e-mail or telephone if the sender's phone number is listed above, then promptly and permanently delete this message. Please note
that any
attached electronic files are furnished for your information only. This should be considered as an interim work product and is subject to continued modification and revision. This is
not a
construction document. Construction documents with the appropriate seal, signed and dated, can be provided if necessary. Any use of this electronic file including modification, insertion,
or
appendage to other documents is at the user's risk. Any reproduction or distribution of this information requires written authorization from ESP Associates, P.A.
4