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September 21, 2000
Dean Construction
701 Hall Street
Cedar Hill, Texas 75104
Attn: Mr. Greg Firebaugh
Re: Moisture Evaluation No. 1
MacArthur Park Improvements
400 MacArthur Boulevard
Coppell, Texas
HBC Project No. 94001377
Gentlemen:
fir
ENGINEERING, INC.
a division of 1 k1'tww
HBC Engineering, Inc. (HBC) has completed its first evaluation of moisture levels achieved by water
pressure injection at the above referenced site. This evaluation was performed on the entire
building pad. The building pad was injected by four passes with water prior to this evaluation.
Two borings were drilled on September 18, 2000. Each boring was continuously sampled to a depth
of 10 feet with thin walled tubes. The samples were extruded, logged, sealed and packaged at the
site for transportation to the laboratory. In the laboratory, moisture content and hand penetrometer
readings were determined on one foot intervals.
A diagram depicting the boring locations is attached. Laboratory data is provided on the attached
Summary of Laboratory Tests.
Sandy clays were encountered throughout Boring 2 and to a depth of about 4 feet in Boring 1. Clays
were encountered beneath the sandy clays in Boring 1 and extended to the boring termination at
10 feet. Review of moisture content determinations and hand penetrometer tests indicate the
moisture levels are at or above the desired levels considering the types of soil encountered in the
borings. It is therefore HBC's recommendation that the select fill be placed as soon as possible to
minimize the loss of moisture in the clays prior to placement of the slab. This information was
conveyed to Dean Construction on September 19, 2000.
Houston D
Dallas F
Fort Worth A
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Mr. Greg Firebaugh
Dean Construction
September 21, 2000
Page 2
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Please contact us if there are any questions concerning the test results or recommendations.
Sincerely,
HBC ENGINEERING, INC.
Brian A. Powell, P.E.
Project Engineer
cc: Larry Davis / Construction Inspector, City of Coppell (1)
Lee Stone / Building inspector, City of Coppell (1)
CHURCH PARKING LOT
3
0
0
0
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W
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0
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0:
2
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v
0
FIRE O
STATION
B
B-
B
0 50 100 FEET
APPROXIMATE SCALE
NOTE: RORINO LOCATIONS ARE APPROXIMATE
BORING LOCATION DIAGRAM
MOISTURE EVALUATION No. 1
MacARTNUR PARK *~VEMENTS
COPPELL. TEXAS
NBC Project Noa 94001377 Detsp 09/18/00
MOISTURE EVALUATION NO. 1
SUMMARY OF LABORATORY TESTS
PROJECT NAME: MacArthur Park Improvements
Coppell, Texas
a &610" oflin�mn
PROJECT NO.: 94001377 DATE: 09/19/00
Boring
Number
Depth
feet
Percent
Moisture
Hand
Penetrometer
1
0 -1
16
0.0
1 -2
12
1.0
2 -3
29
1.5
3 -4
15
1.5
4 -5
29
2.0
5-6
29
1.5
6 -7
28
2.5
7 -8
35
0.5
8 -9
34
1.3
9 -10
30
0.8
2
0 -1
16
0.5
1 -2
16
0.5
2 -3
12
3.0
3 -4
21
1.5
4 -5
12
3.0
5 -6
16
0.5
6 -7
12
3.0
7 -8
15
3.0
8 -9
13
2.5
9 -10
13
3.8