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CTLITHOMPSON <br />January 14, 2008 <br />Greg Lewicki and Associates <br />11541 Warrington Court <br />Parker, Colorado 80138 <br />Attention: Mr. Ryan Ellis <br />Subject: Rock Core Test Results <br />Project No. CT14431-455 <br />Dear Mr. Ellis: <br />This report presents compressive strength and permeability results for a rock slab <br />that was delivered to our laboratory. The rock slab was cored and samples were <br />prepared for compressive strength and permeability testing. <br />The rock core was tested in general conformance with ASTM D 7012 (Method C), <br />"Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying <br />States of Stress and Temperatures." The sample did not meet the specification the height <br />to diameter ratio, due to the size of the original specimen. The compressive strength of <br />the core is 9,050 psi. To correct for the shorter than specified height to diameter ratio we <br />applied a correction factor according to ASTM C 42 for concrete cores. The correction <br />factor for the height to diameter ratio is 0.938 which is equivalent to a corrected <br />compressive strength of 8,490 psi. Results are presented in Table 1 <br />One 3-inch diameter core was submitted to Knight Piesold for permeability testing <br />using a flex-wall permeability (ASTM D 5084). The permeability of the specimen is 2.9 x <br />10-5 cm/s flow for the 3-inch diameter core. <br />The hydraulic conductivity test (USBR 5600) is currently running on an 8-inch <br />diameter core. The very low permeability makes this test very slow, and as of now, no <br />flow has been detected in the test method. After flow begins, data can be taken and we <br />will send the results of the testing when the testing is complete. <br />If you have any questions regarding the information in this report, please feel free <br />to contact us. <br />Respectfully submitted, <br />CTL I THOMPSON MATERIALS ENGINEERS, INC. <br />Matthew A. Best/ <br />Materials Lab Manager <br />Reviewed by: <br />Awl /el, 1 . <br />Orville R. Werner II, P.E. <br />Principal <br />MAB:ORW/mab <br />22 Lipan Street I Denver, Colorado 80223 1 Telephone: 303-825-0777 Fax: 303-893-1568 <br />This test report relates only to the items tested and shall not be reproduced, except in full, without written approval of CTL Thompson, Inc.