CF-Cozby Library-CS 940520 (2)May 20, 1994
Mr. Jim Bullock
F & S Partners, Inc
3535 Travis, Suite #201
Dallas, Texas 75204-1497
RE: W.T. Cozby Public Library
Coppell, Texas
Dear Mr. Bullock:
In accordance with your request and authorization of March 22, 1994, we have reviewed
your grading plan (dated January 5, 1994) and a sketch of drainage systems (faxed to our
office March 22, 1994) and estimated the pump capacity necessary to keep the water
level at collecting pit below elevation 459.
Our review of your plans indicates that the bottom of the foundation slab is at elevation
466.58 with select fill immediately underneath the slab extending to elevation 463.12 to
459.79. Also, the 100 year flood elevation is at 463.8. Consequently, part of the select
fill could be submerged if heavy rainfall continues for along period of time.
In order to keep the water level below the select fill, a pump with capacity of not less
that 30 gpm at the drainage pit should be installed. This estimate is based on the
assumption that the permeability of the select fill is on the order of 10-4cm/s.
Mr. Jim Bullock
March 28, 1994
Page Two
We trust the above information is sufficient for your use. If you have any questions,
please do not hesitate to contact our office.
Sincerely,
GEE Consultants, Inc.
Gary G. Huang, Ph.D. Richard W. Gee, P.E.
Project Manager President
Geotechnical Engineering Division
GGH:RWG/Iej
cc: Gary Sieb - City of Coppell
Mike Sherpinskas - Diversified Construction Services, Inc.
Ayres Associates
Robert Williams - Brockette Davis Drake, Inc.