THE YORK POTW SERVES 7 COMMUNITIES (ALL OF THE CITY YORK PLUS PART OF NORTH YORK BORO, WEST YORK BORO, SPRING GARDEN TWP, MANCHESTER TWP, WEST MANCHESTER TWP & YORK TWP) W/A COMBINED POPULATION OF APROX 100,000. APPROX 8% OF THE PLANT'S INFLUENT FLOW IS CONTRIBUTED BY INDUSTRIAL DISCHAR- GES METERED BY THE CITY OF YORK. THE YORK FACILITY HAS 2 PARALLEL TREATMENT TRAINS, A PURE OXYGEN ACTIVATED SLUDGE SYSTEM & A CONTACT STABILIZATION SYSTEM. TOTAL DESIGN FLOW FOR BOTH SYSTEMS IS 26 MGD. YORK HAS 2 PERMITTED DISCHARGES, ONE FOR EACH TREATMENT TRAIN. THE PLANT HAS A LONG HISTORY OF VIOLATING THE REQUIRED EF- FLUENT LIMITATIONS FOR PHOSPHORUS, AMMONIA, BOD, & TSS AT BOTH DISCHARGE OUTFALLS. THE 1ST NPDES PERMIT FOR THIS PLANT WAS ISSUED BY EPA ON 11/18/74. THE 2ND NPDES PERMIT WAS ISSUED BY THE PA DER ON 7/21/81. THIS PERMIT WILL EXPIRE ON 7/21/86. ON 9/21/81 EPA ISSUED AN ADMINISTRATIVE ORDER DUE TO YORK'S INABILITY TO COMPLY W/THE PERMIT LIMITATIONS FOR BOD, AMMONIA, TSS & PHOSPHORUS. THE PLANT WAS NOT DESIGNED TO MEET THE PERMIT LIMITATIONS FOR BOD & AMMONIA. THE ORDER REQUIRED THAT YORK MEET LESS STRINGENT LIMITS FOR BOD. NO EFFLUENT LIMITS OR MONITORING REQUIREMENT WERE SET FOR AMMONIA. THE LIMITA- TIONS FOR TSS & PHOSPHORUS WERE THE SAME AS THOSE IN THE PERMIT. THE DEF WAS ORDERED TO SUBMIT A FACI