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~~ <br />September 14, 2006 <br />Carma <br />Highland Place 11 <br />9110 East Nichols Avenue, Suite 180 <br />Greenwood Village, Colorado 80112 <br />Attn: Mr. Tyler Packard <br />Re: Quality Assurance (QA) Plan <br />Bayshore Ponds <br />Terracon Project No. 25045300 <br />Siegrist Construction Company M-1982-015 <br />1 ~~rr~con <br />Consulting Engineers 8 Scientists <br />10625 West 1.70 Frontage Road North, Suite 3 <br />Wheat Ridge, Colorado 80033 <br />Phone 303.423.3300 <br />Fax 303.423.3353 <br />www.terracon.com <br />At your request, Terracon is providing this quality assurance plan to be implemented during <br />the construction of the proposed slurry wall at the referenced project. <br />The QA plan will consist of providing confirmatory testing to compare to the QC testing <br />(performed by GEO-CON) in accordance with local or other recognized standards for slurry <br />wall construction. The specific testing to be pertormed will be in general accordance with <br />the recommendations outlined in the "Guide to Specification Preparation for Slurry Walls <br />and Clay Liners as a Component of a Colorado Mined Land Reclamation Permit" prepared <br />by DMG dated September, 2000. The report gives a general outline of the specific tests to <br />be performed, testing frequency, and other design criteria. <br />In general, a minimum of 10% of the frequency of testing to be performed by GEO-CON will <br />be performed by Terracon unless a higher frequency is determined to be necessary or <br />requested by the owner. The total number of tests to be performed will be determined <br />based on the construction schedule and the number of crews working during the <br />construction of the project. <br />At a minimum, the following tests/observations will be pertormed during construction of the <br />slurry wall: <br />1. Trench Depth and Key <br />Measurement of the trench depth to verify compliance with slurry wall <br />design specifications/assumptions <br />• Observation and collection of samples of the bedrock key material to <br />verify that the appropriate bedrock key material has been penetrated <br />Delivering Success for Clients and Employees Since 1965 <br />More Than 80 Offices Nationwide <br />