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Northlake 635(7)-LR 980306STATISTICAL ANAL'~, ,IS OF CONCRETE ENGINEERING, IN'C. 8901 Carpenter Frwy., Suite #100 Dallas, Texas 75247 Date of Service: 03/06/1998 Report No.: 9803065A Report Date 03/06/1998 Client No.: 71765000 Project No.: 43-2479-97 Client: Prentiss Properties Limited, InC.Atm: David Glass Project: Calling Centercoppell, Texas GOPy 3890 W. N.W. Hx~.', Suite 400 Dallas TX 75220 Services: Review concrete compressive strengths for compliance with project specifications and ACI 318 Building Code. PROJECT DATA S~'ECIHCATION REQUIREMENTS: 4000 psi @. 28 Days CONCRETE CLASS: 9349 REPORT OF TESTS NUMBER AIR CONCRETE COMPRESSIVE RUNNING REPORT OF SLUMP CONTENT TEMP STRENGTH 3 TEST AVG DATE NUMBER SET SAMPLES (in.) (%) (F) PSI PSI 03/03/1998 9806338 1 2 6.00 N/A 59 4695 03/03/1998 9806338 2 2 6.00 N/A 59 5215 03/03/1998 9806338 3 2 5.75 N/A 54 4955 4955 03/03/1998 9806338 4 2 8.75* N/A 58 4310 4827 03/03."1998 9806338 5 2 6.50 N/A 58 4555 4607 03/03/1998 9806338 6 2 6.25 N/A 65 5710 4858 03/03/1998 9806338 7 2 6.50 N/A 68 5405 5223 03/05/1998 9806549 1 2 5.00 N/A 68 5190 5435 03/05/1998 9806549 2 2 5.00 N/A 66 4985 5193 03/05/1998 9806549 3 2 6.00 N/A 68 4260 4812 03/05/1998 9806549 4 2 5.00 N/A 68 4230 4492 03/05/1998 9806549 5 2 5.00 N/A 68 4740 4410 03/05,"'1998 9806549 6 2 5.25 N/A 68 4870 4613 03/05/1998 9806549 7 2 5.00 N/A 68 5170 4927 03/05/1998 9806549 8 2 5.00 N/A 68 4955 4998 03/13/1998 9807175 1 2 5.50 N/A 52 5395 5173 03/13/1998 9807175 2 2 6.00 N/A 50 5405 5252 This report is exclusively tbr the usc of the client indicated above and shall not be reproduced except in full without the written approval of HBC Engineering, Inc. 11 Page I of 2 - - COPY Report No.: 9803065A ~,,~.~.~.~ NUMBER AIR CONCRETE COMPRESSIVE RUNNING REPORT OF SLUMP CONTENT TEMP STRENGTH 3 TEST AVG DATE NUMBER SET SAMPLES (in.) (%) (F) PSI PS! 03/13/1998 9807175 3 2 5.00 N/A 55 5190 5330 03/13/1998 9807175 4 2 5.00 N!A 53 5405 5333 03/13/1998 9807175 5 2 5.50 N/A 51 5610 5402 03/13/1998 9807175 6 2 5.00 N/A 50 5805 5607 03/20/1998 9807733 1 2 5.50 N/A 60 5370 5595 03/20,:1998 9807733 2 2 5.00 N/A 60 5160 5445 03/20/1998 9807733 3 2 4.75 N/A 57 4965 5165 03/20/1998 9807733 4 2 4.00 N/A 58 5010 5045 03/20/1998 9807733 5 2 4.00 N/A 70 7275 5750 03/26/1998 9808202 1 2 4.75 N/A 62 5115 5800 03/26/1998 9808202 2 2 5.00 N/A 64 5315 5902 03/26/1998 9808202 3 2 5.25 N/A 64 5510 5313 03/26/1998 9808202 4 2 4.75 N/A 70 5300 5375 04/02/1998 9808790 1 2 5.50 N/A 79 3610 4807 04/02/1998 9808790 2 2 5.00 N/A 50 4840 4583 07/13/1998 9817874 1 2 5.50 N/A 80 3310' 3920** 07/13/1998 9817874 2 2 5.50 N/A 81 3310' 3820** 07/15/1998 9818105 1 2 4.75 N/A 98 4080 3567** 07/15/1998 9818105 2 2 4.50 N/A 100 5075 4155 07/17/1998 9818337 1 2 6.00* N/A 96 4625 4593 07/17/1998 9818337 2 2 7.00* N/A 97 4350 4683 An asterisk (*) appears next to test results which fall below 500 PSI of the project specifications. Two asterisks (**) appear next to the averages which do NOT meet the project specifications. Average of all sets of three consecutive strenghts does NOT equal or exceed the project specifications. Average of 38 sets = 4950 PSI @ 28 days Standard Deviation = 719 PSI Standard Deviation is not corrected because there are 30 or more samples. 4000 + 1.34 * 719 = 4963 PSI 4000 + 2.33 * 719 = 5175 PSI Required Average Strength per ACI 318 (89) 5.3.2.1 = 5175 PSI ACI Criteria is NOT satisfied. Technician: Eugene Harbour ~ Engineering, Inc. Report Distribution: (1) Prcntiss Properties Limited, Inc. (1) Haiti'Associates, Inc. (1) Butler Construction (1) City of Coppcll (1) Alliance Architects, Inc. (1) Evcrt.'Butler Const. (1) Brockette Davis Drake, Inc. (1) H BC Engineering; Mr. Eugene Harbour This report is exclusively for the use of thc client indicated abox e and shall not be reproduced except in full without the written approval of HBC Engineering, Inc. I i Page 2 of 2