Town Center L1B1-LR 951101 PARKLAND ENGINEERING & TESTING, INC.
GEOTECHNICAL ENGINEERING CONSULTANTS ,
3601 KlM DRIVE, SUITE 102
P.O. BOX 154196
IRVING, TEXAS 75015 -'
PETER YU, M.S., P.E. " TEL: (214) 986-1694
PRESIDENT FAX: (214) 790-5378
Job No. 95-173-1
November 01, 1995
Overton Bank & Trust
P.O. Box 948
Coppell, Texas 75019
ATTN: Mr. Mike Shipman, President
RE: Pavement Subgrade Construction Criteria
Overton Bank & Trust Building
102, N. Denton Tap Road
Coppe11, Texas
Dear Sir:
This letter is to follow up our phone conversations on
October 31, 1995 with Mr. Atul Patel, Engineer for City of
Coppell and ~. David Dorris, Project Manager for Innovative
Developers, Inc. wherein the above referenced matter was
discussed. Mr. Patel asked if the cement treated base should be
used for the pavement subgrade instead of the lime stabilization
scheme which had been ruled out based on our previous test
results ( see Letter of October 28, 1995 ). The following is to
further evaluate our analysis and comments with Mr. Patel and Mr.
Dorris:
~N]~LYSIS ~ND COMMENTS:
1. Since the pavement subgrade soils are tested to be of iow
to medium Plasticity Indices ( P.I. of 9 to 15 or less
) and are relative inactive, we deem that there is not
a necessity to use the cement treated base. This
scheme is just optional only if the owner wants to
increase the service life of the pavement.
2. For the City Approach, Fire Lane and the Drive-In Bank
paved areas, according to Mr. David Dorris, a 6.0
Overton Bank & Trust Bldg., Coppell, Tx.
Page 2 of 2/ 95-173-1
inches thick, 3,000 PSI concrete would be used while
over the general parking area, a 5.0 inches thick
pavement would be adopted ( using the same concrete
strength ) as called for by the project Civil Engineer.
3. We mentioned to Mr. Patel that the construction methods
and specifications for the City Approach would be
complied with according to the City's Building Codes
/ Specifications. Whether there will be a need to
increase the pavement thickness or the concrete
strength for the City's Right-Of-Nay / Approach ( as an
alternative for the deletion of the optional cement
treated base if the City has ever decided to specify
such a requirement with regard to a low P.I. subqrade
soil ) will be determined by the City of Coppell and
IDI, the General Contractors will be notified
accordingly. For the Bank's serviced pavement areas (
private property sections ), we feel that the owner
ought to have their own choice of options because they
have a limited budget and will probably ( after the
construction warranty period ) assume the maintenance
over the service life of the pavement.
We trust this is the information requested. Thank you.
Yours very truly,
PARKLAND ENGINEERING & TESTING, INC.
Peter Yu, M.S., P.E.
Geotechnical Engineer
PY/ta
C.C.:
1- Client
1- City of Coppe11 / Mr. Larry Davis, Construction Inspector
1- Innovative Developers, Inc./ Mr. David Dorris, Project Manager
PARKLAND ENGINEERING & TESTING, INC.