Prologis Park-CS150506 (2)
Michelle Matunas
From:Michael Garza
Sent:Friday, May 08, 2015 8:27 AM
To:Michelle Matunas
Subject:FW: infrastructure comments
Attachments:LTR 2015-05-06 Variance Request.pdf
Can you file the email and the attachment here: Engineering\\Name Projects\\Prologis Park\\Correspondence
Thanks,
mike
From: Gossett, Robert \[mailto:rGossett@Halff.com\]
Sent: Wednesday, May 06, 2015 7:14 PM
To: Michael Garza
Subject: RE: infrastructure comments
1.See the attached letter for the variance request on rebar and psi of the concrete. I can send you the
geotechnical report for your records as well if you want it.
2.Items 1 under both the drainage notes and the utility notes state this (although one of them said Flower Mound-
I fixed that). I also added a boxed not that state City Standards and Details take precedence.
3.I routed the flow through the whole channel, and that got me under the 1500 cfs threshold. This still has no
future detention built into the numbers. With the future phase we will be utilizing truck court detention, and
detention pond where it works with the site plan/grades. That will just improve the amount of runoff. I have
everything calculated out, and will update the plans tomorrow.
4.I found 3 manholes greater than 12 feet that we will upsize to 5 diameter. I read through your code and could
not find the exact threshold. Other cities typically use 12 feet, so I went with that.
Let me know if you have any questions. If not I will resubmit signed and sealed construction drawings sometime Friday.
Thank You
Robert Gossett, P.E.
Project Manager
O: (214) 346-6200
D: (214) 217-6432
HALFF ASSOCIATES, INC.
1201 N Bowser Rd
Richardson, TX 75081-2275
www.halff.com
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From: Michael Garza \[mailto:MGarza@coppelltx.gov\]
Sent: Thursday, April 30, 2015 6:08 PM
To: Gossett, Robert
Subject: infrastructure comments
Robert,
Below are my comments:
1.Our requirement for pavement sections are #4 bars on 18” centers with 3600 psi concrete. Write me a letter
requesting a variance for our files.
2.Make sure you reference city standards and details in your general notes for materials for water, sewer, storm
drain.
3.The biggest concern I have is that the channel downstream was designed for 1500 cfs according to these plans
attached. Can you take a look and verify and see if there is something we can do. We are sending an additional
100+ CFS, I know Coppell Road was designed at 1750 cfs but im a little concerned downstream of this.
4.Check the depths of the sanitary sewer manholes, over a certain depth, I think 10-12 feet, maybe 15’ they need
to go to a 5’ manhole instead of 4’.
Other than that I think everything else is fine.
I am out of the office tomorrow but can touch base with you on Monday.
Thanks,
mike
Michael Garza, P.E.
Assistant Director of Engineering
Engineering Department
City of Coppell, TX
www.coppelltx.gov
972-304-7019 (office)
Please take our customer service survey
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