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.* <br /> <br />MATRIX ENGINEERS, INCORPORATED <br />CIVIL ENGMEERMG 1066 WEST 102ND AVENUE MEMBER <br />STRUCTURAL ENGMEERMG NORTHGLENN, COLORADO 80221 AMERICAN CONSULTMG <br />LAND SURVEYMG PHONE (303) 451-0828 ENGINEERS COUNCIL <br />January O5, 1995 <br />ADCO Consulting <br />c/o Robert Fleming <br />2090 E. 104th Avenue, Suite 305 <br />Thornton, Colorado 80233 <br />Re: Dahlia North Mining Plan <br />Affect of Installation of Slurry Wall on Adjacent Structures <br />Dear Mr. Fleming <br />This is a follow up letter to my previous letter of last July in <br />regard to the affect the proposed mining operation would have on <br />certain substantial man made structures within 200' of the permit <br />boundary of the above proposed mining plan. The Division of <br />Minerals and Geology has asked for an opinion on the affect on <br />substantial man-made structures from the slurry wall installation. <br />This installation would take place within the 25' setback area, <br />approximately 10'± within the property line. The slurry wall would <br />be installed before any adjacent mining was undertaken, and would <br />involve excavation and filling of a trench to bedrock parallel to <br />the property line for slurry wall installation. The nearest <br />structures to the slurry wall installation are the rear of <br />greenhouse structures located along a south boundary of the permit <br />area 50'± outside of the permit boundary. Therefore, the actual <br />minimum distance from the edge of the greenhouse structures to <br />slurry wall installation would be approximately 60'±. <br />In my opinion, 60'± is sufficient to protect the above substantial <br />man-made structures from the possibility of damage, especially <br />since this would occur before any mining would be undertaken and <br />thus there would be no potential for slope or cut failure from the <br />adjacent mining activities. As with the previous letter, all <br />excavation should be undertaken by qualified personnel under the <br />direction of qualified and responsible supervisors. This opinion <br />is limited only to potential physical damage. It is not intended <br />to cover any possible impact the operation may have on the <br />opaqueness of the greenhouse glass, and whether dust from the <br />operation may affect the light into the greenhouse. <br />I hope this letter meets your needs. If anything further is needed, <br />please let me know. <br />Si cerely, <br />William W. Wilson <br />