NATURE OF THE CASE: THE CITY OF HARLINGEN, TEXAS OWNS AND OPERATES TWO TREATMENT PLANTS WHICH DISCHARGE DIRECTLY INTO ARROYO COLORADO OF THE NUECES-RIO GRANDE COASTAL BAS- IN. HARLINGEN'S COMPLIANCE PROBLEMS, WHICH DATE BACK TO 1967, INVOLVE VIOLATIONS OF EFFLUENT LIMITATIONS, PRETREAT MENT PLANS, CONSTRUCTION, O&M AND FAILURE TO COMPLY WITH TWO ADMINISTRATIVE ORDERS. THE CITY HAS RECEIVED CONSTR- UCTION GRANT FUNDS. A CIVIL PENALTY OF $90,000 IS RECOMM- ENDED.