ST0501-CS130111 JAN-11-2013 01:15 P.01/05
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From: richardgee @geeconsultants.com <richardgee @geeconsultants.com>
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To: kgriffln @coppelltx.gov
Cc: Marshall,George <gmarshall @coppelltx.gov>, Marvin, Keith <kmarvin @coppelltx.gov>,
Garza,Mike <mgarza @coppelltx.gov>, Motiar Rahman <motiar @geeconsultants.com>
Date: Friday,January 11, 2013 01:55 pm
Subject: Utility Trench Failures and Upcoming Projects
Attachments: D Text version of this message. (2KB)
6.) TCMT-Logo.jpg (29KB)
,V GEE-Logo.jpg (30KB)
1 City of Coppell 2013 Engineering Projects.pdf(425KB)
Mr. Griffin:
We want to thank you for allowing us to provide the concrete and soils testing for the Deforest Rc
Reconstruction project recently completed.
During the reconstruction of Deforest Rd. we mentioned to Mr. Larry Davis and Mr. George Marsh
that we were working on a study for another municipality that addresses utility trench constructio
and related potential causes of failure in the associated pavement patches. The impetus for our
investigation was the result of too many pavement failures occurring at recently utility replaceme
locations. •
The investigation is limited to 12 i11ciidiameter or less PVC water and sewer line constcyjtion and
pavee iPtgatch decision flo c arts and commentary that pecifically address potential causes o'
fai ure and re u on thereof. The charts and commentary delve into training of City personnel,
geotechnical investigations, existing City Standard Utility Patch design sections, minimum pipe
depth, trench dimensions, embedment materials, backfill, flowable fill select fill, utilization of
geosynthetics, flexible base/lime/cement/cem-lime subgra em AC,AC/PCC and PCC
pavement thickness, pavement cutting, pavement "T" section configuration, partial/full lane
construction, crack/joint sealing, QA necessary by City personnel and QC testing by an independe
laboratory.
We are nearing the completion of our utility trench and pavement patch decision flow chart and
commentary development. The next phase of our investigation will consist of putting together a
related training seminar. Prior to this phase we would be glad to me- - , h your engineers and
inspectors to share what we have put together thus far and discu � , pu they might ha e an
potential for training of City of Coppell personnel. \i t, / 0. 1 /$ ) 7v f j
Please let us know if you and/or your engineers would be interested in meeting to dis the abc
design flow charts and commentary. In the mean time we have attached a letter nterest
regarding necessary materials testing for upcoming 2013 City of Coppell cons ction projects.
Again, thank you and we look forward to working with you again.
Sincerely,
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