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REPORT OF SLURRY WALL OBSERVATION <br />Report Number: 25045300.0023 <br />1 ~~rracon <br />10625 West I-70 Frontage Road North <br />Service Date: November 7, 2006 Wheat Ridge; Colorado 60033 <br />(303) 423-3300 <br />~t: Report Date: November 28, 2008 <br />a Project: Saint Vrain Site Slurry Wall <br />Attn: Tyler Packard I-25 Frontage Rd & County Rd 28 <br />188 Inverness Drive West Longmonk CO <br />Ste 150 <br />Englewood CO 80112 <br />Services: <br />Project No.: 25045300 <br />Terracon arrived on-site to observe slurry wall construction. Viscosity and unitweightwere tested <br />at the mixing plant for the AM shift. Geo-Con slurry did not work the AM shift due to the <br />equipment repairs. Geo-Con started excavating at approximately 12:00. Observation of slurry wall <br />excavation and material testing of viscosity, unit weight, percentage of sand by volume and <br />bentonite backfill was completed for the PM shift Bentonite backfill was sampled for gradation and <br />permeability testing at station 3+40. <br />Field Results Reported To: Carrot 8 Lange; Geo-Con <br />I~ <br />Terracon Rep: Timothy M. Zieschang <br />Report Distribution: <br />(1) Canna <br />Reviewed b ~ ~ ~ " "~'- <br />Y <br />Raymond L Denton <br />The tests were performed in general accordance with apPliceble ASTM, AASHTO, or DOT test methods. This report is exclusivety for the use of the dient <br />indicated above and shall not be reproduced except in full without the written consent of our company.. Test results transmitted herein are onty applipble <br />to the adual samples tested at the locatwn(s) retarenced and are not necessarily indicative of the properties of other epparendy similar or identical <br />materials. <br />Page 1 of 1 ,,,,,., <br />