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• April 16, 2007 <br />Carma Colorado, Ltd. <br />188 Inverness Drive West, Suite 150 <br />Englewood, CO 80112 <br />Attention: Mr. Tyler Packard/ Mr. Brad Davis <br />1 ~~rracon <br />Consulting Engineers & Scientists <br />301 North Howes <br />Fort Collins, Colorado 80521 <br />Phone 970.484.0359 <br />Fax 970.464.0454 <br />www.ten-acon.com <br />Re: Bayshore Ponds Slurry Wall Quality Assurance Summary Report <br />WCR 9-112 and WCR 28 <br />Weld County, Colorado <br />Terracon Project No. 25045300 <br />Terracon has completed the quality assurance plan implemented during the consWction of the slurry <br />wall at the referenced project. The quality assurance plan was performed as outlined in our <br />previously submitted quality assurance (QA) plan dated September 14, 2006. A copy of the <br />previously submitted QA plan is attached for reference. <br />Based on our field observations and laboratory testing at the project it is our opinion that the slurry <br />wall was constructed in general accordance with the applicable project specifications. The test <br />results were reported in general accordance with the recommendations outlined in the "Guide to <br />Spec cation Preparation for Slurry Walls and Clay Liners as a Component of a Colorado Mined Land <br />Reclamation Permit" prepared by DMG dated September, 2000. The individual field test reports, <br />observations, and laboratory testing associated with construction of the slurry wall are included in the <br />attached appendices. <br />We appreciate being of service to on this phase of the project, and are prepared to assist you during <br />other phases as well. Please do not hesitate to contact us if you have any questions concerning this <br />report or any of our testing, inspection, design and consulting services. <br />Sincerely, <br />TERRACON CONSULTANTS, INC <br />~~~0 ~C~ir <br />.• r~c- <br />V~:L~"T'Pt~ <br />.~ ~~ <br />• 40208 a: <br />Raymond L. Denton, II, P.E. 'ct`~i.....•~~C>~~ <br />Project Manager/Geotechnical Engi ONAL <br />Enclosure <br />Copies to: Addressee (2) <br />Meurer and Associates (3) <br />143 Union Boulevard, Suite 600 <br />• Lakewood, CO 80228 <br />Attn: Ms. Jodi ~Ila, P,E. <br />~~~ <br />A. Richer, P.E. <br />Geotechnical Engineer/ Department Manager <br />Delivering Success for Clients aMd Employees Since 1965 <br />More Than 80 Offices Nationwide <br />