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COLORADO DEPARTMENT OF HEALTH <br />Richard D. Lamm <br />Governor <br />February 18, 1983 <br />Mr. William Dotterrer <br />Standard Metals Corp. <br />P. 0. Box 247 <br />Silverton, CO 81433 <br />Frank A. Traylor, M.D. <br />/876 Executive Director <br />Re: Standard Metals Corp. Mayflower Mill, CO- 0000426, San Juan County <br />Seepage Control Plan <br />Dear Sir: <br />The Division has received your proposed plan for seepage control from <br />tailings pond No. 4. The plan as submitted fulfills the first requirement <br />of Part I.D. of the discharge permit. <br />However, there are a number of questions concerning the information <br />presented. <br />1. Do the monitoring wells shown go to a depth below the toe drain? <br />That is, do these wells intercept any water that might be flowing <br />beneath the tailings pond in the natural alluvium? <br />2. When the tailings pond was originally constructed were the tailings <br />placed in direct contact with the natural alluvium or does the toe <br />drain extend under the tailings pond itself? <br />3. If seepage from the tailings pond can get to the natural alluvium, <br />will the measures you have proposed to control the seepage be <br />effective for groundwater below the level of the toe drain? <br />4. Concerning the field study, how was the seepage direction determined? <br />Would you send to the Division a copy of the water quality analyses <br />performed? <br />4210 EAST 11TH AVENUE DENVER,COLORADO 80220 PHONE (303) 320 -8333 <br />