THE CITY OF CORSICANA OPERATES A 4.5 MGD WASTEWATER TREATMENT PLANT REFERRED TO AS PLANT 2. PLANT 2 ACTUALLY CONSISTS OF THREE SEPARATE UNITS: THE 1958 PLANT--1.5 MGD; THE 1977 PLANT--2.0 MGD; THE OVERLAND FLOW PLANT--1.0 MGD. THE CITY REPEATEDLY VIOLATED EFFLUENT LKIMITS FOR BOD AND TSS FROM JANUARY 1980 THROUGH NOVEMBER 1983. FROM NOVEMBER 1983 THROUGH THE PRESENT, THE CITY HAS FAILED TO MEET THE DESIGN EFFLUENT LIMITS FOR THE OVERLAND FLOW PLANT (OUTFALL 002). HOWEVER, THE NPDES PERMIT WAS NOT MODIFIED TO INCLUDE LIMITS FOR THIS PLANT UNTIL JUNE OF 1984, THERE- FORE THE VIOLATIONS FROM THAT PLANT ONLY DATE FROM IN JULY, 1984. THE CITY HAS BEEN IN COMPLIANCE WITH LIMITS FOR OUTFALL 001 (THE CONVENTIONAL PLANTS), SINCE NOVEMBER 1983. THE THREE PLANTS UTILIZED BY THE CITY OPERATE IN PARALLEL. THE 1958 AND 1977 PLANTS CONSIST OF PRIMARY CLARIFIERS, AERATIONN BASINS AND FINAL CLARIFIERS. THE OVERLAND FLOW PLANT, CONSTRUCTED IN 1982, COLLECTS SOLIDS FROM THE TWO CONVENTIONAL PLANTS, TREATS THEM AND ULTIMATELY DEPOSITS THE WASTE ON THE CITY LANDFILL. ADDITIONALLY, THE CITY HAS HAD A PERMIT CONDITION SINCE 1979 THAT REQUIRES IT TO DEVELOP A PRETREATMENT PROGRAM. THE CITY HAS MADE LATE AND INCOMPLETE SUBMISSIONS TO THE REGION IN AN ATTEMPT TO DEVELOP AN APPROVABLE PROGRAM. THE REGION HAS ISSUED TWO ADMINISTRATIVE ORDERS TO THE CITY THIS YEAR REGARDING ITS FAILURE TO COMPLY WITH