DEF OWNS/OPERATES TITANIUM DIOXIDE PROD FAC IN BALTI- MORE, MD. DEF DSCHRGS EFFLUENT INTO PATAPSCO RIVER. DEF FIRST OBTAINED NPDES PRMT IN 9174. DEF CONSISTENTLY DSCHRGD IN EXCESS OF PRMT. DEF IMPROPERLY IDENTIFIES EXPIRED, INTERIM LIMITS IN MONITORING RPTS. DESPITE WARNINGS FR EPA AND ST OF MD, DEF REFUSES TO ACKNOWLEDGE MORE STRINGENT PRMT LIMITS APPLICABLE TO DSCHRGS. DEF REFUSAL SUGGESTS THAT DEF FAILS TO RPT VIOL CAUSED BY DSCHRGS W/IN EXPIRED INTERIM LIMITS. IN ADD, DEF IS RESP FOR PERIODIC DSCHRGS OF UNTREATED WSTWTR INTO RIVER. DEF STORES WSTWTR FR SULFATE PROCESS IN LAGOON AND LAGOON LEAKS TO GRNDWTR (AND EVENTUALLY TO RIVER) AND PERIODICALLY OVERFLOWS TO RIVER W/OUT FINAL TRTMNT.