ST8402-CS 881122GINN, INC.
CONS;
ENGINEERS
November 22, 1988
Mr. Russell R. Doyle, P.E.
City Engineer
city of Coppell
P.O. Box 478
Coppell, Texas 75019
Re:
Denton Tap Road Improvements from Belt Line Road to Sandy
Lake Road; and from Sandy Lake Road to Denton Creek.
Dear Mr. Doyle:
This letter is a follow-up to my November 16, 1988 letter and
your November 18, 1988 response concerning the proposed Change
Order No. 1 to both projects for the replacement of Lime with
Cement for subgrade stabilization. I am enclosing a copy of John
H. Haynes and Associates, Inc. Laboratory Report No. 18, dated
November 4, 1988, which states the conditions under which the
Cement Stabilization will be acceptable on this project. In our
discussions with the Contractor, L. H. Lacy Co., they have agreed
to abide by the John H. Haynes and Associates Inc.
recommendations and to apply the additional cement required near
Station 91+00 to reduce the Plasticity Index to 12 or less, at
no additional cost to that proposed for 5% treatment.
Since this item has been reviewed and approved by our
Geotechnical Engineer, and we have previously informed you of the
potential cost savings of approximately $ 14,072.10 associated
therewith, we feel that it is in the best interest of the City of
Coppell to approve the proposed Change Orders and allow the
Contractor to proceed at once with his subgrade preparation.
Please call me if you have any questions.
sincerely,
John C. Karlsruher, P.E.
Project Engineer
enclosures
cc:
Alan D. Ratliff, City Manager
Frank Trando, Deputy city Manager
H. Wayne Ginn, P.E.
David M. Snyder, P.E., L. H. Lacy Co.
Randy Fleming
J378/379
17103 Preston Road · Suite 100 · LB 118 · Dallas, Texas 75248 · Phone 214/248-4900