HAWKER PACIFIC OPERATES THE HAWKER PACIFIC FLIGHT ACCESSORY DIVISION FACILITY IN SUN VALLEY, CALIFORNIA WHICH REPAIRS AND MAINTAINS AIRCRAFT LANDING GEAR. AS PART OF THESE OPERATIONS, HAWKER PACIFIC CONDUCTS ELECTROPLATING 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 DESIGNED TO PROTECT THOSE TREATMENT PLANTS. SINCE APRIL 27, 1984, ALL EXISTING JOB SHOP ELECTROPLATERS THAT DISCHARGE TO SEWAGE TREATMENT PLANTS HAVE BEEN REQUIRED TO COMPLY WITH THE PRETREATMENT STANDARDS GOVERNING THE CHARACTER OF THEIR INDUSTRIAL WASTEWATER. HAWKER PACIFIC HAS VIOLATED NUMERICAL CONCENTRATION-BASED LIMITS GOVERNING ITS WASTEWATER QUALITY RESULTING IN AT LEAST 44 DAYS OF VIOLATION.