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MAY 20 '96 10:57AM DIV/MINERALS&GEOLOGY P.2i2 <br /> STATE OF COLORADO <br /> Ray Romer,Governor <br /> Patti Shwayder,Acting Executive Director <br /> Dedicated to protecting and improving the health and envfronment of the people of Colorado <br /> 4300 Cherry Creek Dr.S. Laboratory Building , <br /> Denver,Colorado 60222.1530 4210 E_1 ith Avenue <br /> Phone(303)692-2000 Denver,Colorado 80220-3716 <br /> (303)6914700 Colorado Deparu ent <br /> Of Public Health <br /> and Fnviro=ent <br /> May 14, 1996 <br /> Ms.Diane Delaney <br /> Mid-Continent Resources,Inc <br /> P.O. Box 1298 <br /> Glenwood Springs,CO 81602 <br /> Re: Whole Effluent Toxicity("WET")at Outfall 016 and the Rook Tunnel Ponds Reclamation Plan <br /> - - CDPS Permit No. -0000396 Isitkin-Count3' - - <br /> Dear Ms.Delaney: <br /> A couple of issues have prompted this letter:the Aquatic Impairment Study C'AIS')results and the Colorado <br /> Division of Minerals and Geology's("DMG")desire to proceed with the reclamation plan for the Lack Tunnel <br /> Ponds. The AIS indicates thatt the discharge from Outfall 016 does impact the aquatic life of Dutch Creek. <br /> However, 1991 WET testing of the mine water entering the Rock Tunnel Ponds shows no WET to the species <br /> tested,while tht effluent discharging from the ponds showed toxicity to ceriodaphnia dubia. If the mine water <br /> influent to the pounds still demonstrates no WET,DMG intends to divert it from entering the ponds,routing it <br /> directly from the portal to the creek. The ponds'would continue to serve as storm water sedimentation ponds,if they <br /> are not a source of WET_ <br /> Discontinuing treatment of the mine water concerns the WQCD because of past Total Suspended Solids violations <br /> and the AIS's implication that increased silt and sand loading to the creek is adversely impacting <br /> maeroinvertebrates. Therefore,prior to DMG proceeding_we request that Mid-Continent Resources run acute WET <br /> tests using ceriodaphnia dubia and simultaneous Total Suspended Solids analyses,swVling the influent to the <br /> Rock Tunnel Ponds,and sampling the efficient discharging out of these ponds through Outfall 016,on two separate <br /> occasions between now and the end of June. We would like the data by July,if possible,so-DMG can complete their <br /> work during this construction season. <br /> Please let me know if you will be able to fulfill our request. And please contact me with any questions at(303)692- <br /> 3603- <br /> Sincere , <br /> Kathleen L_ Sullivan <br /> Industrial Enforcement Eaeuu er <br /> Permits and Enforcement Section <br /> WATER QUALITY CONTROL.DMSION <br /> ca: Steve Renner,DMCi• <br /> Bob Shukle,WQCD <br /> MS-3 File <br />