Stratford Manor-LR 990624FU SOUTH, INC.
Project No. 0791 -2064
June 24, 1999
Huie Construction Co.
14275 Midway Road, Suite 100
Dallas, Texas 75244
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Attention: Mr. David A. Whitsett
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SUMMARY OF SUBGRADE OBSERVATIONS
STRATFORD MANOR SUBDIVISION
COPPELL, TEXAS
Dear Mr. Whitsett,
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2880 Virgo Lane
Dallas, Texas 75229
Tel : (972) 484 -8301
Fax: (972) 620-7328
As requested by the City of Coppell construction inspector, Fugro South traveled to the
site and visually observed the condition of the exposed subgrade for the project
referenced. The purpose of the visit was visually evaluate the condition of the
subgrade due to concerns of the City with respect to the amount of sand encountered in
same areas and whether lime would be effective in these locations. Mr. David Belcher,
P.E. visited the site the site on June 21, 1999 and observed the condition of the
exposed subgrade. This letter summarizes the observations noted during the field visit
as well as the discussions with Rodman Excavating after the visit.
The main area of concern was the section of Stratford Lane in front of lot number 5. It
appeared that the soils for approximately 150 to 200 -ft of the roadway subgrade were
very sandy with little clay binder. This area had been cut and appeared to be the
lowest area of roadway at the site. The remainder of the exposed subgrade appeared
to be moderate to high plasticity clays and they should react with the planned lime.
Our visual observations at the site indicate that due to the very sandy nature of the soils
in the vicinity of lot number 5 along Stratford Lane, the lime may not be effective in
treating these soils. One option would be to use lime for the remainder of the subgrade
and use cement treatment in this isolated section of subgrade. Due to the difficulty
changing the type of stabilization for a small section of subgrade, a more preferable
option may be to undercut approximately 6 to 8 -in of the sandy subgrade in this area
and replace with clayey soils from other areas of the site. The subgrade could then be
lime stabilized like the remainder of the subgrade. An added advantage to this option is
that it provides for a more uniform subgrade throughout the roadway rather than having
a more rigid section where the cement would be used.
A member of the Fugro group of companies with offices throughout the world.
Stratford Manor
June 24, 1999
Page 2
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We appreciate the opportunity to be of assistance on this project. Please feel free to
contact us if you have any questions or if we can be of further service.
Sincerely
FUGRO SOUTH, INC. qSt of i
DAVID A 9,-'.i
David A. Belcher, P.E. ; " " "" " "'
s ,�, CO3-36 Senior Project Manager
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Distribution: Huie construction — David Whitsett
Alton Loyd Inc. — Preston Skaggs
City of Coppell — Larry Davis (Fax)
Rodman Paving — Joel Smith (Fax)