JDC OPERATES THE JEWELRY DESIGN CENTER FACILITY IN LOS ANGELES, CALIFORNIA WHICH LEASES SPACE TO JEWELRY MANUFACTURERS. AS PART OF THE MANUFACTURING PROCESS, JDC'S LEASEES CONDUCT METAL FINISHING OPERATIONS. JDC DISCHARGES INDUSTRIAL PROCESS WASTEWATER FROM ITS FACILITY TO THE HYPERION TREATMENT PLANT FOR TREATMENT AND DISPOSAL INTO THE PACIFIC OCEAN. ALL FACILITIES THAT DISCHARGE INDUSTRIAL WASTEWATER TO SEWAGE TREATMENT PLANTS ARE REQUIRED TO COMPLY WITH LOCAL LIMITS DESIGNEDTO PROTECT THOSE TREATMENT PLANTS. SINCE FEBRUARY 15, 1986, ALL EXISTING METAL FINISHERS THAT DISCHARGE TO SEWAGE TREATMENT PLANTS HAVE BEEN REQUIRED TO COMPLY WITH THE PRETREATMENT STANDARDS GOVERNING THE CHARACTER OF THEIR INDUSTRIAL WASTEWATER. JDC VIOLATED NUMERICAL CONCENTRATION-BASED LIMITS GOVERNING ITS WASTEWATER QUALITY RESULTING IN AT LEAST 440 DAYS OF VIOLATION.