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Amberpoint BP-LR020320March 20, 2002 Transwestern Commercial Services 5001 Spring Valley Road, Suite 600W Dallas, Texas 75244 Attn: Mr. Jim Gaspard Re: Moisture Evaluation No. 4 __~Amberpoint Buildin,q ~n Coppell, Texas HBC Project No. 94021029.0137 ENGINEERING, [NC. a division of 'l ~n'racon Gentlemen: HBC Engineering (HBC) has completed its fourth evaluation of moisture levels achieved by water pressure injection at the above referenCed site. This evaluation was performed along the south portion of the Building No. 1 pad. The southern portion of the pad was injected with seven passes with water prior to this evaluation. A total of 15 borings were drilled at the site on Mamh 14, 2002. Each boring was continuously sampled to a depth of about 8 feet with steel 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. Absorption swell tests were also performed on selected samples to further evaluate the volume change potential of the injected clays. A diagram depicting the approximate boring locations is attached. Laboratory data is provided on the attached Summary of Laboratory Tests and Swell Tests Results. Review of moisture content determinations, hand penetrometer, and swell tests indicate that indicate that most of the moisture levels along the south portion of the pad are generally at or near desired levels. It is our opinion that additional injections of the pad would be of little benefit. Therefore, HBC recommends that the lime cap be installed along the south portion of the pad as soon as possible to maintain current moisture levels in the injected soils. This information was conveyed to Hill and Wilkinson on Mamh 18, 2002. Houston Dallas Fort Worth Austin Texas City 11555 Clay Road 8901 Carpenter Frwy, 2601 Gravel Drive 5307 Industrial Oaks Blvd. 3602 3rd Avenue North Suite 100 Suite 100 Fort Worth, TX 76118 Suite 160 Texas City, Texas 77590 Houston, TX 77043 Dallas, TX 75247 (817) 268-8600 Austin, TX 78735 (409) 945-3503 (713) 690-8989 (214) 630- 1010 Fox (817) 268-8602 (512) 442-] 122 Fax (409) 945-5077 Fax (713) 690-8787 Fax (214) 630-7070 Fax (512) 442-1181 Mr. Jim Gaspard Transwestern Commercial Services March 20, 2002 Page 2 Please contact us if there are any questions concerning the test results or recommendations. Sincerely, HBC ENGINEERING Project Engineer CC: O'Brien & Associates / Richard Nordyke (1) TechniStructures, Inc. / Keith Leslie (1) City of Coppell - Const. Insp. / Larry Davis (1) City of Coppell - BLdg. Insp. / Lee Stone (1) Hill & Wilkinson, Ltd. / Bryan Diagle/Kirk Woltman (1) Halff Associates / Jaime Beard/Travis Markham (1) Z SANDY LAKE ROAD NOTE: I~RING LOCATIONS ARE APPROXIMATE ~)B-20 B~24 B-28~) a-21 ~B-22 9-26~) B-29 0 125 250 FEET APPROXIMATE SCALE BORING LOCATION DIAGRAM MOISTURE EVALUATION No. 4 AMBERPOINT BUILDING No. 1 GOPPELI-, TEXAS Project No., 94021029 Date, 03/18/02 MOISTURE EVALUATION NO. 4 SUMMARY OF LABORATORY TESTS PROJECT NAME: Amberpoint Building No. 1 Coppell, Texas PROJECT NO.: 94021029.0137 DATE: 03/20/02 17 0-1 20 4.5+ 1-2 19 4.00 2-3 26 2.00 3-4 27 1.75 4-5 20 3.25 5-6 19 4.00 6-7 18 4.5+ 7-8 17 4.5+ 18 0-1 19 4.00 1-2 19 4.30 2-3 27 1.75 3-4 26 2.75 4-5 24 4.5+ 5-6 25 3.75 6-7 24 3.25 7-8 21 4.25 19 0-1 15 4.5+ 1-2 17 4.5+ 2-3 21 4.00 3-4 23 2.75 4-5 23 3.50 5-6 26 2.00 6-7 25 2.75 7-8 19 3.50 20 0-1 31 0.50 1-2 18 4.5+ 2-3 18 4.5+ 3-4 26 2.75 4-5 22 3.00 5-6 21 2.50 6-7 18 4.50 7-8 18 4.5+ 21 0-1 17 4.5+ 1-2 17 4.5+ 2-3 28 2.75 3-4 28 3.00 4-5 28 2.50 5-6 23 3.00 6-7 25 2.75 7-8 27 2.00 22 0-1 26 0.75 1-2 22 3.00 2-3 20 4~5+ 3-4 20 4.5+ 4-5 30 2.50 5-6 29 2.25 6-7 17 2.25 7-8 27 3.00 MOISTURE EVALUATION NO. 4 SUMMARY OF LABORATORY TESTS PROJECT NAME: Amberpoint Building No. 1 Coppell, Texas PROJECT NO.: 94021029.0137 DATE: 03/20/02 23 0-1 23 1.75 1-2 15 4.5+ 2-3 15 4.5+ 3-4 21 2.75 4-5 18 4.5+ 5-6 21 4.5+ 5-7 24 3.50 7-8 21 4.5+ 24 0-1 17 4.5+ 1-2 19 4.5+ 2-3 18 4.5+ 3-4 24 2.00 4-5 22 2.25 5-6 21 3.50 6-7 19 3.25 7-8 17 4.00 25 0-1 18 4.5+ 1-2 18 4.5+ 2-3 16 4.5+ 3-4 18 4.5+ 4-5 19 4.5+ 5-6 21 4.5+ 5-7 21 4.5+ 7-8 23 4.5+ 26 0-1 19 4.00 1-2 18 4.5+ 2-3 22 3.00 3/4 20 4.5+ 4-5 21 4.5+ 5-5 25 3.25 6-7 24 2.50 7-8 19 4.5+ 27 0-1 25 1.25 1-2 19 4.00 2-3 18 4.5+ 3-4 20 4,5+ 4-5 21 4.5+ 5-6 18 4.00 6-7 18 4.00 7-8 21 3.50 28 0-1 21 2.25 1-2 30 0.75 2-3 23 2.25 3-4 24 2.75 4-5 23 3.25 5~6 23 2.75 5-7 19 3.50 7-8 17 4.5+ MOISTURE EVALUATION NO. 4 SUMMARY OF LABORATORY TESTS PROJECT NAME: Amberpoint Building No. 1 Coppel[, Texas PROJECT NO.: 94021029.0137 DATE: 03/20/02 29 0-1 25 1.25 1-2 21 3.75 2-3 22 3.25 3-4 26 2.25 4-5 25 2,00 5-6 30 1.25 6-7 32 1.25 7-8 25 4.25 30 0-1 20 2,00 1-2 22 1.75 2-3 19 1,50 3-4 21 3.00 4-5 25 1.75 5-6 20 3.25 6-7 20 2.25 7-8 16 4,25 31 0-1 22 1.25 1-2 18 4.5+ 2-3 18 4.5+ 3-4 23 3.00 4-5 21 2.00 5-6 19 4.00 6-7 18 3.75 7-8 18 4.00