ST0501-CS080403
(8/15/2011) Keith Marvin - Fwd: RE: Deforest Court/Windsor Estates DrainagePage 1
From: Keith Marvin
To:Spann, Quinn
Date: 4/3/2008 9:00 AM
Subject: Fwd: RE: Deforest Court/Windsor Estates Drainage
Quinn,
This bounced with the attachments, so I removed them.
Keith
Keith Marvin, P.E.
Project Engineer
(972) 304-3681
>>> Keith Marvin 4/3/2008 8:46 AM >>>
Dennis,
we appreciate your willingness to meet with us. I am attaching the plans as PDF files to this email. The Villages of Coppell was a
subdivision built prior to the two Halff designed on the south side of Deforest Road. The only question there is whether there was a
determination made that the DA shown in those plans was somehow bypassing the drainage system designed by Halff within
Deforest Road.
The question we have relative to the Windsor Estates and Deforest Court plans is what caused the change in the water surface
elevation at the outfall between the Windsor Estates design and the Deforest Court design. We would also like to get a copy of
your design calculations for the detention pond so we can evaluate what happens if we put more runoff into the pond.
If you are able to recall any of these details, or if you can retrieve your archived files, we would appreciate it. Let me know if you
would like to meet to go over this.
Thanks for your help.
Keith Marvin, P.E.
Project Engineer
(972) 304-3681
>>> "Chovan, Dennis" <dchovan@halff.com> 4/3/2008 7:28 AM >>>
Keith
The engineer who coordinated this design with the City is no
longer with Halff, and I am not familiar with the Villages of Coppell
Project. I work out of our Frisco Office and am willing to meet you and
your consultant here to discuss the drainage. Both Windsor Estates and
Deforest Court have been archived so it would be helpful if you could
bring copies of these plans to the meeting.
Dennis J. Chovan P.E.
Vice President
HALFF ASSOCIATES, INC.
3801 Parkwood Blvd Suite 500
Frisco, Texas 75034
Phone 214-346-6224
Fax 214-217-6431
www.halff.com
(8/15/2011) Keith Marvin - Fwd: RE: Deforest Court/Windsor Estates DrainagePage 2
-----Original Message-----
From: Keith Marvin [mailto:kmarvin@ci.coppell.tx.us]
Sent: Monday, March 31, 2008 5:15 PM
To: Quinn Spann; Chovan, Dennis; Skipwith, Walter
Cc: DiWanna Baskins
Subject: Deforest Court/Windsor Estates Drainage
Dennis and Walter,
I know this is reaching back a few years, but we need a little help.
The City of Coppell has hired Quinn Spann with GSWW to design some
improvements to Deforest Road. We will be rebuilding the portion from
MacArthur Blvd to the concrete portion constructed with Windsor Estates.
We hope to preserve as much of the drainage system within Deforest as
possible. We have some specific questions that we are looking for
answers to that I am unable to find in city records. We would like
either meet with you to talk through these, or see if you can provide
any insight on the following:
1. Can you provide us with copies of your computations for the design
of the detention pond in Windsor estates?
2. There is a change in the HGL elevation at the downstream end of the
pipe at the referenced pond between the Windsor Estates plans and the
Deforest Court plans. Was there something that happened that caused
this(LOMR, flap gate, etc...)?
3. The Villages of Coppell DA Map shows two DA's that discharge to the
Deforest Road ROW within the limits of the drainage system built with
Deforest Court. This water is not reflected in the Deforest Court
plans.
Any insight you can provide in these areas would be helpful.
Thank you.
Keith Marvin, P.E.
Project Engineer
(972) 304-3681