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I. INTRODUCTION <br />This report describes the computer modeling analysis carried out for Aggregate <br />Industries, Inc. pursuant to the October 4, 2001 agreement with Martin and Wood <br />Water Consultants, Inc. The study was carried out for Aggregate Industries in <br />response to alleged impacts on nearby wells caused by dewatered mining <br />operations of the Platte Valley Pit. This report discusses the overall <br />hydrogeologic regime, the computer model design and construction, the <br />assumptions incorporated and the results of the simulations carried out. <br />II. PURPOSE <br />The purpose of this study was to assist Aggregate Industries in assessing the <br />impacts on the local ground water system from dry mining that has been carried <br />out at the Platte Valley Pit to be located approximately 1-1/2 miles north of <br />Brighton, Colorado and along the South Platte River (Figure I, Vicinity Map). Of <br />concern was the pattern of drawdowns propagated in the alluvial aquifer by the <br />mining activities, and the potential for impacts on specific neighboring water <br />wells in the vicinity of the pit. A Mr. Brancucci has reported that he has been <br />experiencing water level impacts in several of a number of domestic supply and <br />high capacity irrigation wells located approximately 1,800 to 2,000 feet from the <br />eastern edge of the Platte Valley Pit property. Concerns have arisen over both the <br />current phase of mining (north mine phase) and the proposed additional mining <br />work to be carved out in the southern portion (south mine phase). <br />1 <br />Martin and Wood Water Consultants, Irsc. <br />