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AND 602 Palk Pointone:o(3p3)?ive, Suite 273. Golden, CO &A01 <br />Ph 526-2600. Fax: (3031526-2624 <br />E-mol: mwi@maftandwood.com <br />WOOD <br />wave cwawwM etc. <br />September 10, 2003 <br />F?ECE'VE <br />Mr. Les Ewegan <br />Les Ewegen, LLC SEP 10 2003 <br />37615 WCR 39 <br />Eaton, CO 80615 Division of Minerals & Geology <br />Dear 114r. Ewegan: <br />Re: 124x' Estates Partners Gravel Pit <br />Distance - Drawdown Investigation <br />Project Number 573.1 <br />As requested, this letter presents <br />impacts emanating from the results of our analyses into the estimated drawdown <br />Avenue and U S. Hi gavel minin the g operations at the 12am <br />Highway o 85 in Adams County, Colorado This 4 sI Fstat ??en conPit ducted 1240 <br />response to a DMG inspecrin carried out following a complaint b a Iv <br />the Tucson Water Company. Ur Grandlienard is a by David Grandlienard of <br />?""up in the local water table has im Pparently claiming that a reported four foot <br />"F al er we to P ted the ability of the Tucson Water r <br />prates matching the reported historic rates of product, any's son. hallow <br />(Irandlienard further claims that it is the pumping of the pit, in the process of mine <br />that is cousin the locol drawdown Mr. <br />S reportedly impacting the Company's well. dewatering, <br />To carry out our analyses we have examined the local d <br />environtneat in the vicinity of the pit and have h3' rogcofogic and hydraulic <br />Predicted level of drawdown that might be ?°? out calculations estimati % <br />the <br />very large diameter in an unconfined alluvial aquifer. from the pit when simulated as a well of <br />distance to negligible drawn aquifer. The result of the analytical calculation is a <br />be experienced Note *A in other words, the distance at which no measurable drawdown <br />w All <br />the buffering effects of the that South the Platte analytical River recharmethodology applied to this exercise has ignored <br />the Wal grad1ent an of which will in real' t the numerous lakes around the area and <br />drawdown impacts. nY end to severely reduce and limit the calculated <br />The setting for the pit and the Tucson Water Company highly well (permit <br />transmissive alluvial aquifer several number 420-4) comprised miles wide and many miles in ten <br />of sands and gravels with a recharging <br />and mined out flooded pits and a surface stream, numerous adjacent open lakes <br />subsurface and surficW now of waterle emwlest to northeast gradient controlling both the <br />ditches cross the study area. We reviewed several coal cations capacity and leaky the USG our unlined irrigation <br />investigations <br />I'd ESTEG62EOE <br />Ohl I dOOdQ dgg : ZO 60 OT lag