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Verizon-LR 990129STATISTICAL ANAL¥ 5IS OF CONCRETE ENGINEERING, INC. 8901 Carpenter Frwy., Suite #100 Dallas, Texas 75247 Date of Service: Client No.: Client: 01/29/1999 08644025 The Beck Group At-tn: Gillett Berger 1700 Pacific Ave., Suite 3800 Dallas TX 75201-4619 Report No.: 9834168A Project No.: 43-2333-98 Report Date 01/29/1999 Project: GTE Shared Services Coppell Road & Corporate Drive Coppell, Texas Services: Review concrete compressive strengths for compliance with project specifications and ACI 318 Building Code. SPECIFICATION REQUIREMENTS: CONCRETE CLASS: 8208 PROJECT DATA 5000 psi ~ 28 Days REPORT OF TESTS NUMBER AIR CONCRETE COMPRESSIVE RUNNING REPORT OF SLUMP CONTENT TEMP STRENGTtl 3 TEST AVG DATE NUMBER SET SAMPLES (in.) (%) (F) PSI PSI 11/09/1998 9830433 I 2 5.00 N/A 74 5520 ! 1/10/1998 9830515 I 2 5.00 N/A 75 7820 11/I 1/1998 9830691 I 2 6.50 N/A 72 7615 6985 11/16/1998 9831049 I 2 5.50 N/A 75 6230 7222 11/17/1998 9831209 I 2 5.00 N/A 72 7025 6957 11/19/1998 9831410 1 2 6.50 1.2% 81 6210 6488 11/20/1998 9831595 1 2 4.75 1.2% 69 7915 7050 l 1/23/1998 9831744 I 2 6.50 1.3% 78 6960 7028 12/08/1998 9833080 I 2 5.75 N/A 71 6980 7285 12/09/1998 9833168 1 2 5.50 1.4 64 6200 6713 12/09/1998 9833168 2 2 5.75 N/A 63 7170 6783 12/09/1998 9833168 3 2 5.25 1.6 66 7630 7000 12/09/1998 9833168 4 2 6.25 N/A 66 7300 7367 12/11/1998 9833418 I 2 6.00 1.4 58 5490 6807 12/11/1998 9833993 I 2 6.00 N/A 68 6465 6418 12/12/1998 9833513 1 2 5.50 1.3 62 6165 6040 12/17/1998 9833992 I 2 5.75 N/A 63 6745 6458 11 This report is exclusively for the use of the client indicated above and shall not be reproduced except in full without thc written approval of HBC Engineering, Inc. Page I of 2 it:eport No.: 9834168A DATE 12/17/1998 12/17/1998 12/17/1998 12/17/1998 12/18/1998 12/19/1998 12/21/1998 12/28/1998 12/28/1998 12/28/1998 12/28/1998 12/28/1998 12/29/1998 NUMBER AIR CONCRETE COMPRESSIVE REPORT OF SLUMP CONTENT TEMP STRENGTH NUMBER SET SAMPLES (in.) (%) (F) PSI 9833992 2 2 5.50 1.6 67 6460 9833992 3 2 5.75 1.5 64 5905 9833992 4 2 5.50 N/A 66 7025 9833992 5 2 5.25 N/A 61 6620 9834074 I 2 9.00 1.9 58 6695 9834168 I 2 6.75 1.6 62 4700 9834234 I 2 6.75 N/A 58 6225 9834785 1 2 6.25 N/A 56 5525 9834785 2 2 6.25 N/A 55 5540 9834785 3 2 5.75 N/A 55 5360 9834785 4 2 5.50 N/A 56 7080 9834785 5 2 6.50 N/A 57 6450 9834950 1 2 6.50 N/A 69 6725 Average of all sets of three consecutive strenghts equals or exceeds the project specifications. Average of 30 sets = 6530 PSI ~ 28 days Standard Deviation = 788 PSI Standard Deviation is not corrected because there are 30 or more samples. 5000 + 1.34 * 788 = 6056 PSI 5000 + 2.33 * 788 = 6336 PSI Required Average Strength per ACI 318 (89) 5.3.2.1 = 6336 PSI ACI Criteria is satisfied. RUNNING TEST AVG PSI 6457 6370 6463 6517 678O 6005 5873 5483 5763 5475 5993 6297 6752 Technician: Eugene Harbour Report Distribution: 0') The Beck Group (1) Gromatzky Dupree & Assoc. (I) Brockette Davis Drake, Inc. (I) The Beck Group (I) Thc Beck Group (1) Dalcan, Inc. Engineering, Inc. This report is exclusively lbr the usc of the client indicated above and shall uot be reproduced except in full without the written approval of ItBC Eugineering, Inc. II Page 2 of 2