Coppell Health-SY 890313
ROBERTS & DOWDEY CIVIL ENGINEERS
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16200 Dallas Parkway, Suite 200
Dallas, Texas 75248
(214) 931-0694
Robert E. Acrey. P.E.
Dan M. Dowdey. P.E.
David E. Pierson. P.E.
Buddy J. Roberts. P. E.
J. G. Threadgill, P.E.
CR.Ur.CI)
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May 10, 1989
Mr. Kevin Peiffer,
Ginn, Inc.
17103 Preston
Suite 100, LB
Dallas, Texas
P.E.
Rd.
118
75248
RE: Lake, Coppell Health Care Center
Dear Kevin:
We have been asked to address the lake aeration situation for subject
project.
Since odor is the main concern of a lake without aeration, we feel that
the nature of the water, primarily storm water runoff, will justify waiting
until a need for an aerator is evident.
The parties involved in the development in the Town Center and Coppell
Health Care Center have a mutual interest in having the l~ke at its best
level of appearance and condition at all. times. They will be able to
respond to the actual need in the event it is apparent that an aerator
is required for the lake. Their agreement is such that the installation
will be handled between them if needed.
The unusual expense required for the development of this first phase of
the Health Care Center makes it extremely desirable to postpone any expenses
that can be postponed as long as possible.
We feel that this delay to see how the lake functions through at least
one complete cycle of rainfall and hot weather is reasonable under the
circumstances.
The enclosed portion of the soils report which relates to the clays which
are available for lining the lake is included for your use. The report
indicates that the soils which are present will be sufficient to maintain
a high degree of impermeability.
ACREY. ROBERTS & PIERSON. INC.
THREADGILL.DOWDEY & ASSOCIATES
Mr. Kevin Peiffer, P.E.
May lO, 1989
Page 2
We will be submitting the trench safety plan in the next few days and
hopefully getting the plans approved very shortly thereafter. The owner
is opening bids on May 24, 1989. It is their desire that construction
begins as soon as possible thereafter.
DMD/dkb
Enclosure
cc: Mr. Otto Bejcek, Metrocrest Hospital Authority
Mr. Grant Hensley, Mediplex Medical Bldg. Corp.
Mr. Mike Allen, Univest Development
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SOUTHWESTERN LABORATORIES
SUBSURFACE EXPLORATION
FOR
COPPELL HEALTHCARE CENTER
COPPELL, TEXAS
Prepared For
Metrocrest Hospital Authority
Dallas, Texas
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March 13, 1989
SWL Report No. 89-106
SOUTHWESTERN LABORATORIES
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SOUTHWESTERN LABORATORIES
North Texas Geotechnical Division
Materials, envinnnnelltal and geot<<hnical engineering, JW1Idutn.u:tive, rnetalluruical and analJltical aervicu
2575 Lone Star Drive. RD. Box 224227 . Dallas. Texas 75222 .214/263-1133
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March 13, 1989
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Metrocrest Hospital Authority
c/o Medip1ex Medical Building Corporation .
12225 Greenville Avenue
Suite 830, LB 115
Dallas, Texas 75243
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Attention: Mr. Phillip H. Taylor
Re: Subsurface Exploration
Coppell Healthcare Center
Coppell, Texas
SWL Report No. 89-106
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Gentlemen:
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Attached is our geotechnical report for the above
referenced project.
It has been a pleasure to perform this work for you. If,
during the course of this project we can be of, further
assistance, please do not hesitate to call on us.
Sincerely,
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S~. ,HWE HWE~STERN LABORATORIES,
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,Garrett E. Williams, P.E.
j'Geotec nical Division
INC.
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Kenneth D. Bain, P.E.
Senior Geotechnical Consultant
Geotechnical Division
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Attachment
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cc: Mr. John Garcia
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HOUSTON · DALLAS · AUSTIN · BEAUMONT. CONROE . GALVESTON COUNTY. RIO GRANOE VALLEY. ALEXANDRIA
SAN ANTONIO · FORT WORTH · LEESVILLE . MIOLANO . MONROE. SHREVEPORT. TEXARKANA . SHERMAN
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SOUTHWESTERN LABORATORIES
Proposed Lake
Excavations of up to eight (8) to ten (10) feet are
anticipated for the proposed lake.
The bottom and sides
will be situated in the reddish brown" and reddish tan and
gray sandy clays.
Deeper excavations will encounter
relatively permeable sands and clayey sands.
These sandy and silty clays are considered relatively
impervious and would normally be considered to provide
adequate protection against la~ge seepage losses.
When
final grades have been established in the excavation, the
upper six (6) inches of the exposed subgrade should be
scarified to a depth of six (6) inches, and compacted to
a minimum of ninety-five (95) percent of Standard Proctor
Density (ASTM 0-698) at/or slightly above (-1 to +5
percent) optimum moisture content as determined by that
test.
Excavations into the sands or clayey sands could require
some type of liner to minimize seepage losses in these
materials unless the shallow water levels measured in
Borings 1,2, and 3 are present in the area of Boring 6.
Since such a water level can be subject to seasonal
fluctuations such a liner may be desirable if excavations
extend into the permeable sands and clayey sands. A clay
SOUTHWESTERN LABORATORIES
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SOUTHWESTERN LABORATORIES
liner (2 to 3 feet thick) would be a suitable liner. The
on-si te sandy silty clays would be a suitable, liner
material. The clay fills should be spread in relatively
horizontal lifts less than ten (10) inches thick, and
uniformly compacted to a minimum of ninety-five (95)"
percent of ASTM D-698 near (-1 to +5' percent) their
optimum moisture content. Periodic watering of liners or
other exposed clays in the excavation is advisable to
minimize cracks until the lake is filled.
Area Pavincr
The surficial clays present at this site are subject to
losses in shear strength with the increases in moisture
content which normally occur beneath area paving. They
react with hydrated lime which serves to improve their
support value at higher moisture levels and provides a
firm, uniform subgrade beneath the paving. We recommend
that consideration be given to stabilizing the subgrade
beneath flexible (asphalt) paving.
Based on the Atterberg Limits Series, a minimum of six
(6) percent hydrated lime (THO Item 264) should be used.
This lime should be thoroughly mixed and blended with the
top six (6) inches of the subgrade (THD Item 260) and the
mixture compacted to a minimum of ninety-five (95)
SOUTHWESTERN LABORATORIES