Vistas of C P1-CS 971217 he City With A Beautiful Future 214-462-0022
December 17, 1997
Robert Poole
Centex Real Estate Corp.
2800 Surveyor Blvd.
Carrollton, TX 75006
RE: Vistas of Coppell lB and 2C
Dear Mr. Poole:
Our Subdivision Regulations as adopted on April 12, 1994, Ordinance No. 94643, requires that
subgrade material with a plasticity index of less than 6 or greater than 12 be modified with a minimum
of 30 #'s per square yard of hydrated lime or cement stabilization. That same ordinance grants the City
Engineer limited authority to deviate fi.om this requirement if soil tests so indicate and an acceptable
alternative is recommended by a soils engineer.
I am in receipt of a soils test and recommendation fi.om Fuqro-McClelland (Southwest) Inc. However,
this test is insufficient to warrant a deviation fi.om our 30 #'s per square yard requirement.
I will be glad to review any additional tests and if you have any questions please feel free to comact this
office at your convenience.
Director of Engineering and Public Works
attachment
fi~~l~c.doc
FUGFIO - McCLELLANO (SOUTHWEST), INC.
December 12, 1
2880 Virgo Lane
Oallas, Texas 75229
Phone: 972-484-8301
Centex Homes Fax : 972-620-7328
1660 S. Stemmons, Suite 150
Lewisville, Texas 75067
Attention: Mr. Robert Poole
Re: Project No. 0771-2221
pH Lime Series Test Results
Vistas of Coppell, lB & 2C
Coppell, Texas
Dear Mr. Poole:
In accordance with your request, we obtained six representative samples of the matedal
exposed at the subgrade level at the referenced project on November 26, 1997.
Atterberg Limits tests and an Eades and Gdm Lime Series test were performed on the
representative soil samples. The results of the Atterberg Limits and Lime Sedes tests
are presented below:
'- -' : ' ' - · ' ....:'-'.. Uquid ~ Plastic . Plasticity
Sample Location ': Material DeSCription Limit ~ Limit i Index
1 Forest Hill, Dark silty clay
station 4+00 49 17 32
2 Claremont Court, Medium brown silty clay
cul-de-sac area 54 19 35
3 Waterview Drive, Grayish brown silty clay
station 2+50 40 18 22
4 Waterview Ddve, Yellowish brown silty
station 7+50 clay 37 16 21
5 Rockcrest Ddve, Light brown silty clay
station 4+35 50 20 30
6 Street west of Medium brown sandy
Cresthaven Drive, clay 27 13 14
station 4+50
A member of the Fugro group of companies with offices throughout the wodd.
Centex Homes
Project No. 0771-2221
December 12, 1997
Page 2
An Eades and Gdm pH and a Lime Sedes test were performed on sample #2. The
results are as follows:
0 8.00
3 11.80
5 12.20
7 12.34
9 12.34
Based on the results of the tests, we recommend that the concrete street subgrade be
stabilized with the addition of 6 percent hydrated lime (28 pounds per square yard for a
six-inch stabilized layer). The lime and the stabilization and compaction of the subgrade
should be performed in accordance with the applicable City specifications.
We trust the information provided herein is sufficient for your present use. Please
contact us if you need any additional information or if we can be of further service.
Respectively submitted,
FUGRO-McCLELLAND (SOUTHWEST), INC.
~ ~'.,' .~ -, _ . :~.
Saad M. Hineidi, P.E.
Vice President '": ' '" - ~: ....
t .-.
~.:~:.:~-.-..:~ __... ..'
SMH/br '~-,.~-.C .' ...... .. --
Distribution: Centex Homes - Robert Poole i~'" '""~':""'::'=' ': -'?-
City of Coppell - Garreth Campbell "
Glenn Thurman Inc.