THIS CASE INVOLVES VIOLATIONS OF THE PRETREATMENT STANDARDS FOR AN EXISTING SOURCE SUBJECT TO THE METAL FINISHING POINT SOURCE CATEGORY, 40 C.F.R. PART 433, AND, IN PARTICULAR THE METAL FINISHING SUBCATEGORY, 40 C.F.R. PART 433, SUBPART A. THE PRETREATMENT STANDARDS GOVERNING THESE DISCHARGES ARE SET FORTH AT 40 C.F.R SECTION 433.15. THESE UNLAWFUL DISCHARGES ARE VIOLATIONS OF SECTION 301(A) OF THE CLEAN WATER ACT ( CWA ), 33 U.S.C. SECTION 1311(A).