20040790 Ver 1_Emails_20081016

DWQ Project No EXP 04-0790 Wynngate Subdivision
Subject: DWQ Project No EXP 04-0790 Wynngate Subdivision
From: Natalie Landry <[e-mail]>
Date: Thu, 16 Oct 2008 08:58:09 -0400

To: "Ian. [e-mail]" <[e-mail]>
CC: "[e-mail]" <[e-mail]>, Robert Anderson
<rnderson@barton-dg. net>
Hi Ian,
During a compliance inspection of the Wynngate Subdivision (EXP 04-0790), I met with the engineer
and owner to discuss some slight field modifications to Stream Impact #1, specifically the riprap apron
dimensions, to better fit field conditions. I requested that the engineer calculate the buffer and stream
impact differences from the approved impacts in the 401. Those numbers are provided in the email
below. Would you please place this in the Wynngate file? Thank you. Natalie
Natalie Landry
Environmental Specialist
NCDENR Division of Water Quality
Raleigh Regional Office
1628 Mail Service Center
Raleigh, NC 27699-1628
Office phone number: 919.791.4258
Mobile phone number: 919.805.1930
Email address: [e-mail]
-------- Original Message --------
Subject:RE: Wynngate riprap apron
Date: Wed, 15 Oct 2008 17:35:47 -0400
From:Tracy Parrott <tracy.parrott(a,summit-engineer.com>
Reply-To: <tracy.parrott(a,summit-engineer.com>
To:'Natalie Landry' <natalie.landry(a,ncmail.net>
N,
I left you a voicemail on your cell phone, but thought I'd follow up with en e-mail as well. Once I got back
to the office, I pulled out the set of plans (CS010 - CS013) showing the jurisdicitional impacts of
Wynngate as compiled at the outset of this project in 2004. 1 see where you got the 50'x20'x30" apron,
as it is given in the Impact #1 Detail for the twin 60" CMP. I noted an inconsistency on the plans,
however. On the overview of the project the notes for Impact #1 call for twin 54" CMP with a 4608'
apron. Probably an oversight.
The construction plans that have been approved call for a 45'x27'x36" apron for the twin 54" pipes. The
change could be due to final design details (profiles, ditches, etc.) that slightly affect drainage areas and
discharges. I wasn't involved in the project back in 2004, so I'm speculating. Anyway, the 45' long apron
is sufficient. The 27' design width is generous and can be trimmed down to match the outer limits of the
headwall. This should result in a width of roughly 20-22 feet based on my observations today.
Stream impacts should be reduced by 5 If. Buffer impacts will not change for Zone 2. Buffer impacts in
Zone 1 will only change slightly, reducing by 100sf for the reduction in length and increasing by 90 sf for
the increased width. Thus a net reduction of 10sf. This is basically the changes in neat dimensions of the
outlet pad. Minimal adjacent impacts associated with construction were anticipated for the original apron
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DWQ Project No EXP 04-0790 Wynngate Subdivision
and still apply to the revised apron. Please advise if you have questions regarding this. ARe you
agreeable to proceeding with the construction/installation? Thanks, TNP
-----Original Message-----
From: Natalie Landry [mailto:[e-mail]]
Sent: Wednesday, October 15, 2008 9:14 AM
To: [e-mail]
Subject: Wynngate riprap apron
Hi Tracy,
The riprap apron dimensions that I have access to are shown on Drawing No. CSO10 (rec'd by
Wetlands/401 Group on 7/7/04) as part of the PCN submitted by Summit. The plans call for
Class 1 riprap 50'Lx20'Wx30"TH. Do you have something more current?
Natalie Landry
Natalie Landry
Environmental Specialist
NCDENR Division of Water Quality
Raleigh Regional Office
1628 Mail Service Center
Raleigh, NC 27699-1628
Office phone number: 919.791.4258
Mobile phone number: 919.805.1930
Email address: [e-mail]
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