SUMMARY DEF OPERATED PLACER MINES ON YELLOW CREEK AND FRIDAY CREEK W/IN BORDERS OF DENALI NATL PARK. MINES RECOVERED GOLD FR NEAR-SURFACE DEPOSITS BY PROCESSING DRDGD SOIL/GRAVE L THRU SLUICE BOXES. FR 6/82 TO 6/83, DEF DIVERTED WTR FROM YELLOW CRK. AFTER WTR PASSED THRU BOXES, PICKING UP POLLUTANTS, IT WAS DSCHRGD INTO YELLOW CRK W/O TRTMNT. NATL PRK SERVICE INSPECTD FAC MANY TIMES. EACH TIME, DEF WERE DSCHRGING EFFLUENTS INTO YELLOW CRK W/O USE OF SETTLING PONDS. ON 06/07/82, EPA INFORMED DEF THAT DSCHRGS REQ NPDES PRMTS AND IF DEF COMPLIED W/TERMS SET IN LETTER, EPA WOULD CONSIDER DEF IN COMPL W/CWA. ON 09/17/83, DEF HAD SINGLE FAILED STTLG POND AND SAMPLING SHOWED SIGNIF VIOL OF ST WTR QUALITY STAND. IN 06/83, DEF LEFT FAC W/O DOING RECLAMATION AND BEGAN MINING AT FRIDAY CRK. DEF DIVERTED WTR FR FRIDAY CRK AND DID NOT TREAT IT BEFORE RETURNING. DSCHRGS OBSERVED BY NPS RANGERS IN 06/83. ON 09/10/83, EPA INSPECTION SHOWED EFFLUE NT DSCHRG INTO FRIDAY CRK W/O TRTMNT. COMPLAINT SEEKS RELIEF FOR DSCHRG VIOL W/O NPDES PRMT AND TO ENJOIN DEF FR FURTHER DSCHRG INTO YELLOW CRK, FRIDAY CRK OR ANY OTHER NAVIGABLEWTRS EXCEPT AS AUTHORIZED BY CWA. COMPLAINT ALSO SEEKS CIV PNLTY OF $10,000/DAY FOR VIOL.