Duke Lesley-CS080114
Tuesday, January 15,20088:49 AM
Keith Flowers 972-462-8564
p.02
Rone Engineering
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January 14, 2008
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Mr. Alex Bennett
Duke Construction, LP
14241 Dallas Parkway, Suite 1000
Dallas, Texas 75254-2936
Re: Lesley Infrastructure
Coppell, Texas
Rone Project No. 0612510
Dear Mr. Bennett:
For the above-referenced project, a review of inspection and testing reports
prepared by Rone Engineering Services, Ltd. (Rone) was performed at your
request. Items reviewed include Concrete CompressIve Strength Testing
performed by Rone from March 29, 2007 through November 2, 2007. The
purpose of this review was to identify non~compliant items (per the project
plans and specificatiol1s) among those items mat were tested and/or
inspected by Rone. After review it appears items tested andlor inspected by
Rone were in compliance with the project specifications at the tirn~ of testing
and/or inspection with the exception of the items noted below.
.. Report #295024 dated 819/7.007, low Gompressive strength at 26
days (see attached)
. Report #295294 dated 8/11/?007, low compressive strength at 28
days (see attached)
.. Report #295394 dated 8/13/2007, low compressive strength at 26
days {see attached}
. Report #295598 dated 8/1412007, low l.Ompressive strength at 28
days (see attached)
. Report #295677 dated 8/15/2007, low compressive strength at 28
days (see attached)
. Report #295814 dated 8/16/2007, low compressive strength at 28
days (see attached)
. Report #296142 dated 8/20/2007, low compressive strength at 28
days (see attached)
The only method of remediation for tl1ese items that will provide compressive
strength test results in lieu of test indications (compressive strength test
results are Ilot available through Swiss Hammer and/or Windsor Probe test
methods) is coring of the in-place concrete for compressive strength. If you
choose to use this method then three cores should be obtained from each
location in question. ACI states that if the average of three cores is at least
85% of the required compressive strength and that no single core is less
than 75% of the required compressive strength then the concrete can be
considered as meeting the required compressive strength specification.
Tuesday, January 15, 20088:49 AM
Keith Flowers 972-462-8564
p.03
Please feel free to call should you have any questions or concerns in this
regard.
Resoectfully Submitted,
~
tJf;Je-
K. Scott Watson, AET
Project Manager
Mark L. McKay, PE
Senior Geotechnical Engineer
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