Bill,
Just a reminder to send a summary of your findings when you get an opportunity.
Thanks,
Clay Barnett, P.E.
Town Engineer
Town of Addison
16801 Westgrove Drive
Addison, TX 75001-2818
Office: (972) 450-2857
From: Clay Barnett
Sent: Monday, January 24, 2011 2:08 PM
To: 'Eric T. Little'
Cc: Nick Jacob; Tom Forrest; 'wgeistweidt@kleinfelder.com'; Tom Lamberth; 'blafoy@ndmce.com'; 'echristiansen@halff.com'; 'thenson@austin-ind.com'; 'Bill Campbell'
Subject: RE: Retaining Wall Backfill
Eric,
Good news: Kleinfelder has reviewed the global slope information for the backfill on the abutments and is not concerned about a global slope failure within the abutments, so we are cleared
to proceed on the rest of the bridge construction.
Bad news: The stairs and ramps on the sides of the abutments were not included in the Global Slope Stability Analysis performed by Geotel. Kleinfelder is concerned about these structures
and is in the process of determining if we need a slope stability analysis performed for these structures. I will let you know as soon as I receive word of their findings.
Thanks,
Clay Barnett, P.E.
Town Engineer
Town of Addison
16801 Westgrove Drive
Addison, TX 75001-2818
Office: (972) 450-2857
From: Eric T. Little [mailto:ELittle@udr.com]
Sent: Wednesday, January 19, 2011 4:19 PM
To: 'echristiansen@halff.com'; Clay Barnett; 'thenson@austin-ind.com'
Cc: Nick Jacob; Tom Forrest; 'wgeistweidt@kleinfelder.com'; Tom Lamberth; 'blafoy@ndmce.com'
Subject: Re: Retaining Wall Backfill
Todd,
The backfill at Ponte is good to go. Please proceed with the rest of the work.
Thanks,
Eric
From: Christiansen, Eric [mailto:echristiansen@halff.com]
Sent: Wednesday, January 19, 2011 03:15 PM
To: Eric T. Little; Maxwell Zhang ; Barnett, Clay
Cc: Nick Jacob; Tom Forrest ; wgeistweidt@kleinfelder.com ; Tom Lamberth; 'Brian J. LaFoy'
Subject: RE: Retaining Wall Backfill
Gentlemen,
We concur that the in-place backfill material, as tested by Kleinfelder, is acceptable for the Ponte abutments without modification.
Sincerely,
Eric Christiansen
Eric S. Christiansen, P.E., SECB, LEED AP
Senior Structural Engineer
HALFF ASSOCIATES, INC.
1201 North Bowser Road
Richardson, Texas 75081
Phone 214-346-6284
Fax 214-739-0095
Cell 972-955-2996
www.halff.com
From: Eric T. Little [mailto:ELittle@udr.com]
Sent: Wednesday, January 19, 2011 3:17 PM
To: Maxwell Zhang; Barnett, Clay; Christiansen, Eric
Cc: Nick Jacob; Tom Forrest; wgeistweidt@kleinfelder.com; Tom Lamberth; 'Brian J. LaFoy'
Subject: RE: Retaining Wall Backfill
Maxwell,
Thank you for your time in reviewing and responding to this issue.
Eric Christiansen,
I believe this settles the issue with the backfill material at the Ponte abutments. Please respond as to your understanding so we can notify AB&R that they can proceed with the approach
slab and paving.
Thanks,
Eric
From: Maxwell Zhang [mailto:geoteleng@yahoo.com]
Sent: Wednesday, January 19, 2011 3:11 PM
To: Eric T. Little; Clay Barnett; echristiansen@halff.com
Cc: Nick Jacob; Tom Forrest; wgeistweidt@kleinfelder.com
Subject: Re: Retaining Wall Backfill
Eric,
Our slope stability analysis was based on two critical sections provided by HALFF. One of the sections exhibited a factor of safety of 1.31 for a long term condition. Lower strength
backfill materials of the proposed retaining walls may result in a factor of safety of less than 1.3.
Usually, we are looking for a factor of safety of 1.5 for any structure placed on a slope for a long term condition.
HALFF is the design engineer of the retaining wall in the record. We have no problem with their decisions.
Let me know if we can be of any further assistance during the course of the project.
Sincerely,
Wei (Maxwell) Zhang, P.E., President
GEOTEL Engineering, Inc.
2906 Ladybird Lane
Dallas, Texas 75220
972-850-2900
972-850-2901 (fax)
214-317-2950 (cell)
wzhang@geotelusa.com
geoteleng@yahoo.com
________________________________
This e-mail and any attachments transmitted with it are the property of GEOTEL and may contain information that is confidential or otherwise protected from disclosure. The information
it contains is intended solely for the use of the one to whom it is addressed, and any other recipient should destroy all copies.
________________________________
From: Eric T. Little
To: Clay Barnett ; "geoteleng@yahoo.com" ; "echristiansen@halff.com"
Cc: Nick Jacob ; Tom Forrest ; "wgeistweidt@kleinfelder.com"
Sent: Tue, January 18, 2011 4:45:23 PM
Subject: RE: Retaining Wall Backfill
Maxwell,
I appreciate you taking the time to meet with Nick and I today and I am glad that we were able to finally get on the same page here. Per our conversation on the phone a bit ago, HALFF
used the factor of safety that was shown in your Global Slope Analysis for the design of the abutment at Ponte. Also as discussed, HALFF feels that the backfill material currently in
place at this abutment is good to go – this assessment is based on the data provided by Kleinfelder from the tri-axle testing they did on this material.
Per my discussion with you, if HALFF is ok with this material, you are ok with it. Please confirm.
Thanks,
Eric
From: Clay Barnett [mailto:cbarnett@addisontx.gov]
Sent: Monday, January 10, 2011 11:10 AM
To: Eric T. Little
Cc: Nick Jacob; Tom Forrest
Subject: RE: Retaining Wall Backfill
Eric,
Please discuss this with Maxwell.
Thanks,
Clay Barnett, P.E.
Town Engineer
Town of Addison
16801 Westgrove Drive
Addison, TX 75001-2818
Office: (972) 450-2857
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From: Nick Jacob [mailto:PJacob@udr.com]
Sent: Friday, January 07, 2011 4:58 PM
To: Clay Barnett
Subject: Fw: Retaining Wall Backfill
From: Maxwell Zhang [mailto:geoteleng@yahoo.com]
Sent: Friday, January 07, 2011 01:26 PM
To: Nick Jacob
Cc: Jonathan McCulley
Subject: Retaining Wall Backfill
Mr. Jacob,
Based on the conversation with Jonathan McCulley with Halff Associates, Inc. today, he only needs lateral earth pressure of the materials with strength parameters provided by other consulting
firm.
The material tested does not meet the requirements as recommended in our Geotechnical report. We understood that the material had been placed behind the retaining walls.
We do not feel comfortable to provide only lateral earth pressure without performing any studies of implications on global slope stability of the retaining walls by using lower strength
materials.
I will be out of town next week. I do not expect that we can complete the studies within two weeks.
Sincerely,
Wei (Maxwell) Zhang, P.E., President
GEOTEL Engineering, Inc.
2906 Ladybird Lane
Dallas, Texas 75220
972-850-2900
972-850-2901 (fax)
214-317-2950 (cell)
wzhang@geotelusa.com
geoteleng@yahoo.com
________________________________
This e-mail and any attachments transmitted with it are the property of GEOTEL and may contain information that is confidential or otherwise protected from disclosure. The information
it contains is intended solely for the use of the one to whom it is addressed, and any other recipient should destroy all copies.
________________________________
From: Nick Jacob
To: "geoteleng@yahoo.com"
Sent: Fri, January 7, 2011 1:17:23 PM
Subject:
pjacob@udr.com
________________________________
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