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iii iiiiiiiiiiiu iii <br />999 <br />14300 Highway 12 <br />Weston, Colorado 81091 <br />(719)868-2761 <br />FAX (719) 868-2275 <br />BASIN <br />RESOURCES,~N~. <br />a subsidiary of ENTECH, Inc. <br />Mr. Joseph Dudash <br />Colorado Division of Minerals and Geology <br />1313 Sherman, Room 215 <br />Denver, CO 80203 <br />RE: Golden Eagle Mine; Permit C-81-013 <br />NOV C-93-12 <br />Dear Mr. Dudash; <br />October 7, 1993 <br />,ter ~-~-:i ~i-, <br />.. .. L l .. <br />OCT 131993 <br />Ci:• r ~," c, ., <br />This letter is to demonstrate that Pond 004 can discharge non- <br />compliance water. An analysis was done of Pond 004. Based on its <br />current status, a 5 year, 24 hour event(2.5") would generate 0.94 <br />ac-ft of runoff. This would cause an increase in the pond water <br />level of approximately 2.0'. At that level, the two sets of <br />drainage holes would be completely above the water line. Discharge <br />would not be possible. Additionally, discharge is prevented by the <br />gate valve at the end of the discharge pipe. <br />A sample of the water currently in the pond was taken October <br />5. The analysis of this sample showed a TSS concentration of 48 <br />mg/1. Although this is above the monthly average, it is well <br />within the allowable maximum. Considering that it would take an <br />event greater than a 10 year event to discharge, the current <br />concentration would be within an acceptable range. <br />Hopefully, this examination and enclosed SEA-CAD run will <br />demonstrate that quality water can be discharged from Pond 004. If <br />you have any questions, or would like to discuss this in more <br />detail, please call. <br />Sincerely; <br />Ralph Lopez <br />Environmental Engineer <br />