Coppell Health-SY 890515TO
GINN, INC.
Consulting Engineers ~
].7103 Preston Road
Suite 100, LB-]*18
DALLAS, TEXAS 75248
(214) 248-4900
WE ARE SENDING YOU ~ Attached [] Under separate cover
via
[] Shop drawings [] Prints [] Plans fications
Copy of letter [] Change order []
COPIES DATE NO. DESCRIPTION
THESE ARE TRANSMITrED as checked below:
[] For approval
~For your use
[] As requested
~ For review and comment
[] FOR BIDS DUE
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[] Approved as noted
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ROBERTS & DOWDEY CIVIL ENGINEERS
16200 Dallas Parkway, Suite200 -- Dallas, Texas 75248 -- (214) 93L0694
Rober! E..~crey. P.E.
Dan M. Dowdey, RE.
David E. Pierson, P.E.
Buddy & Roberts, P.E.
May 10, 1989
NAY II 1989
Mr. Kevin Peiffer, P.E.
Ginn, Inc.
17103 Preston Rd.
Suite 100, LB 118
Dallas, Texas 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 lake 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 r~infall 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.
ACRE¥, ROBERTS & PIERSON, INC. THflEADGILL-00WOEY & ASSOCIATBS
Mr. Kevin Peiffer, P.E.
May 10, 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.
uly yours,
Dan ~
DMD/dkb
Enclosure
CC:
Mr. Otto Bejcek, Metrocrest Hospital Authority
Mr. Grant Hensley, Mediplex Medical Bldg. Corp.
Mr. Mike Allen, Univest Development
SOUTHWESTERN I.ASORATORIES --
SUBSURFACE EXPLORATION
FOR
COPPELL HEALTHCARE CENTER
COPPELL, TEXAS
Prepared For
Metrocrest Hospital Authority
Dallas, Texas
March 13, 1989
SWL Report No. 89-106
SOUTHWESTERN LABORATORIES
North Texas Geotechmcal niwalon
a geotech~tcal enomeer~ng, no~dest~tive, metall~rgkal ami a~dyt~al serv~es
2S75 Lone Star Drive · I~,O. Box 224227 · Dallas. Texas 75222 ·
March 13, 1989
Metrocrest Hospital Authority
c/o Mediplex Medical Building Corporation .
12225 Greenville Avenue
Suite 830, LB 115
Dallas, Texas 75243
Attention: Mr. Philllp' H. Taylor
Re: Subsurface Exploration '
Coppell Healthcare Center
Coppell, Texas -
SWL Report No. 89 106
Gentlemen:
Attached is our geotechnical report for the above
referenced project.
I.t .has been a pleasure to perform this work for you. If,
uurlng the course of this project we can be of further
assistance, please do not hesitate to call on us.
Sincerely,
SO~Y~HWESTERN LABORATORIES, INC.
/Garrett E. Williams, P.E. ~; ;~m_Z'? ....
&; ;..~l. ~'- WILLIAMS
Geo.tec~nical Division ~ · ~.'~' .......
Kenneth D. Bain, P.E.
Senior Geotechnical Consultant
Geotechnical Division
GEW/KDB/mh
Attachment
cc: Mr. John Garcia
ProDosed Lake
Excavations of up to eight (S) to ten (10) feet ere
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 large 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 D-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
09 10,5 -lb- $OUTHWESTE .. LABORATORIES
~ SOUTHWESTERN LABORATORI~.=
liner (2 to 3 feet thick) would be a suitable liner. The
on-site 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 Pavinq
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 (THD 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)