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C~ September 14, 2006 -fir ~~ l~~rracon Consulting Engineers 8 Scientists U Carina Highland Place 1.1 9110 East Nichols Avenue, Suite 180 Greenwood ~Ilage, Colorado 80112 Attn: Mr. Tyler Packard Re: /Quality Assurance (QA) Plan Bayshore Ponds Terracon Project No. 25045300 Slegrist Construction Company M-1982-015 301 North Howes Fort Collins, Colorado 80521 Phone 970,484.0359 Fax 970,484.0454 www.terracon.com RECEIVED /SEP 13 2007 Division of ReGamation, `~ Mining and Safety At your request, Terracon is providing this quality assurance plan to be implemented during the construction of the proposed slung wall at the referenced project. The QA plan will consist of providing confirmatory testing to compare to the OC testing (performed by GEO-CON) in accordance with local or other recognized standards for slurry wall construction. The specific testing to be performed will be in general accordance with the recommendations outlined in the °Guide to Specfication Preparation for Slung Walls and Clay Liners as a Component of a Colorado Mined Land Reclamation Permit prepared by DMG dated September, 2000. The report gives a general outline of the specfc tests to tie performed, testing frequency, and other design criteria. In general, a minimum of 10% of the frequency of testing to be performed by GEO-CON will be performed by Terracon unless a higher frequency is determined to be necessary or requested by the owner. The total number of tests to be performed will be determined based on the construction schedule and the number of crews working during the construction of the project. At a minimum, the following tests/observations will be performed during construction of the slurry wall: 1. Trench Depth and Key Measurement of the trench depth to verify compliance with slurry wall design specifications/assumptions Observation and collection of samples of the bedrock key material to verify that the appropriate bedrock key material has been penetrated • Delivering Success for Clients and Employees Since 7965 More Than 80 Offices Nationwide