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DEPARTMENT OF NATURAL RESOURCES ~ III'll'll'll""III <br />D Monle Pascoe Execu4ve DrteClor <br />MINED LAND RECLAMATION DIVISION <br />DAVID C: SHELTON Director ~ ; <br />Richard D Lamm <br />Governor <br />May 6, 1983 <br />Mr. Charles R. Ponchak <br />Federal Resources Corporation <br />P.O. Box 1790 <br />Ouray, Colorado 81427 <br />RE: Camp Bird Mine <br />FILE: 82-90 <br />Dear Mr. Ponchak: <br />Jiin Pendleton has reviewed the stability analysis pertaining to expansion <br />of the tailings pond embankments and has responded with several <br />recommendations. A copy of his memo is attached. <br />Items 1, 2, 4; and 5 are reiterations from your consultant's report. <br />Item number 3 was tentatively proposed and illustrated on your dewatering <br />system map submitted with your August 25, 1982 correspondence. Because <br />we feel it is important to control slopewash and possible seeps, this <br />item number 3, and items number 1, 2, 4, and 5 will thus become our <br />conditions for approval to continue the planned expansion of the tailings <br />area. All other ayreentents regarding this impoundment as outlined in the <br />permit application shall remain in effect. <br />Finally, regarding piezometer placement and their frequency as discussed <br />in item number 4, you should submit a simple map proposing such <br />locations. In light of the need to evaluate changes in the phreatic <br />level throughout the tailings embankment, it would appear best to try and <br />first determine the location of probable topoyraphic lows beneath the <br />pile and then locate pipes above in a linear fashion at the toe, midway, <br />and on crest of the embankment. Additional points should be added as the <br />expansion continue. A series of these on the southeast side of the <br />planned northeast extention, the southerly side adjacent to Canyon Creek, <br />and the southerly side adjacent to Sneffles Creek would probably provide <br />sufficient information. <br />423 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (303) 866-3567 <br />.! F .. , 3i,... <br />