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D <br />r <br />April 22, 2009 <br />EARTH ENGINEERING <br />CONSULTANTS, INC. <br />Asphalt Specialties Company, Inc. <br />10100 Dallas Street <br />Henderson, Colorado 80640 <br />Attn: Mr. Rob Laird, Land Manager <br />Re: Subsurface Exploration Addendum Report <br />Proposed Turnpike Water Storage Reservoir <br />Highway 52 and Weld County Road 1 <br />Weld County, Colorado <br />EEC Project No. 1082030 <br />Mr. Laird: <br />Earth Engineering Consultants, Inc. (EEC) personnel conducted a subsurface <br />exploration/feasibility study for the proposed Turnpike Water Storage Reservoir project in Weld <br />County, Colorado in May of 2008, and prepared a detailed report of our findings and geotechnical <br />engineering design recommendations based on the subsurface conditions encountered. For further <br />information and findings thereof, please refer to our "Subsurface Exploration Report" dated May <br />28, 2008 and our Addendum Report dated July 2, 2008, EEC Project No. 1082030. We have <br />recently been requested by the project design team, to provide a clarification and/or an opinion <br />relating to the deepened core trench/keyway system for the earthen lined reservoir. <br />The Turnpike Reservoir property is located northeast of the intersection of County Line <br />Road/Weld County Road 1 and Highway 52 in Erie, Weld County, Colorado. More particularly <br />the site is located within Section 31 and the South '/2 of Section 30, Township 2 North, Range 68 <br />West of the 6ch PM. The majority of the site, approximately 32-acres, previously was an active <br />mining pit, which extracted sand and gravel deposits encountered above the bedrock formation. <br />A reclaimed, unlined lake currently occupies the northern portion of the site. <br />The deepened core trench recommendations as presented in EEC's report dated May 28, 2009, <br />stated that trench should be excavated into the underlying bedrock formation to an approximate <br />depth of 10-feet below the bottom of the reservoir or to "practical refusal" within the bedrock <br />formation. It was suggested the core trench be excavated by use of heavy-duty track mounted <br />backhoe machinery capable of excavating hard/competent bedrock having the characteristics of a <br />SPT test of 50 blows per 4-inches or less. The extended core trench was expected to be <br />4396 GREENFIELD DRIVE <br />WINDSOR, COLORADO 80550 <br />(970) 545-3908 FAX (970) 663-0282 <br />