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~i <br />-~ <br />BASIN <br />RESOURCES, ~N~. <br />a subsidiary of ENTECH, Inc. <br />~~, ,. ... <br />_ .,4 <br />Mr. Joseph Dudssh <br />Reclamstion specialist U~ I Q 19J2 <br />Mined Lsnd Reclamstion Division <br />1313 Sherman Street, Room 215 Re~fMf~ed land <br />Denver, Colorado 80203 8 °+'~^ n~ '~; <br />nn <br />Re: Wyoming Fuel Compan}• <br />Golden Eagle Mine, Permit No. C-81-013 <br />TR-18, Dusl Flocculsnt <br />Additional Information <br />Dear Mr. Dudssh: <br />This letter is in response to your request of May 6, 1992 <br />for additional information regarding the potential toxicity <br />of Nalco EnAct 7885 snd £or s more detailed operations and <br />monitoring plan. The following is an update of mine cater <br />discharge activity since requesting the dual chemical <br />treatment and the information requested by the division. <br />Mine water Dischsree <br />Since mid-March 1992, Mine Water has been pumped to both <br />ponds 002 snd 003. The cleaner 2-right caster was either <br />used in the mine for fire supression snd dust control or <br />pumped to pond 002. Samples of this water met the NPDES <br />requiremments. <br />The remainder of the caster was pumped to pond 003. This <br />caster typically represented the mine cater higher in TSS. A <br />eight hour composite sample was collected from the pond <br />discharge as a pre-discharge test prior to commencing <br />routine discharge. TSS for this grab sample toss 61 gms/ml. <br />The pond had been receiving inflow for over thirty days <br />yielding an average retention time of st least 15 days. <br />Thus, even with greatly increased retention times it is not <br />anticipated that the mine caster can meet the average TSS <br />limits of the NPDES permit, and discharge was discontinued <br />after the eight hour test. <br />Due to increased precipitation snd rising pond levels, <br />routine discharge was started from pond 003 on May 28, 1992. <br />The discharge has been sampled on s weekl}• basis since that <br />time; however, lab results have not been received. <br />III IIIIIIIIIIIIIIII <br />999 <br />14300 Highway 12 <br />Weston, Colorado 81091 <br />(719) 868-2761 <br />FAX (719) 868-2275 <br />June 9, 1992 <br />