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iii iiiiiiiiiiiu iii <br />~ • <br />STATE OF COLORADO <br />OFFICE OF THE STATE ENGINEER <br />Division of Water Resources <br />Department of Natural Resources <br />1373 Sherman Street, Room 818 <br />Denver, Colorado 80203 <br />Phone (303) 866-3581 <br />FAX (303) 866-3589 <br />RFCEfVED <br />NOV 0 6 1995 <br />Division of rwinerais & Geology <br />November 2, 1995 <br />Ms. Susan L. Burgmaier <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Yoast Mine (Permit No. C-94-082) <br />Technical Revision No. Ol (Hydrologic Monitoring Sites) <br />Dear Ms. Burgmaier: <br />oe cow <br />Nom, -~° <br />0 <br />~ f8]6 ~` <br />Roy Romer <br />Governor <br />lames S L«hhead <br />Executlve Director <br />Hal D. Simpson <br />State Engineer <br />With respect to the referenced Technical Revision involving the deletion of groundwater <br />monitoring sites where the well casings failed, this office has the following comments: <br />1) If the monitoring well penetrated multiple aquifers, there is concern that the abandonment <br />procedure would properly plug any confining layers to prevent communication between <br />aquifers. <br />2) The mine site is in an area which is currently non-critical (i.e., there are not more water rights <br />than there is typically water available). <br />Therefore, this office does not object to the proposed technical revision at this time. <br />Sincerely, /%/~~' ~ J <br />'Ls~~~t/ <br />Chuck Roberts <br />Professional Engineer III <br />CGR/jmg <br />cc: Mr. Ed Blank, Division Engineer <br />6770L.cgr <br />