PRASA failed to comply with a May 2, 2002 AO requiring Respondent's Arecibo public water system to install and operate continuous monitoring turbidimenters by August 30, 2002. Respondent was to have certified to EPA that compliance with the Enhanced Interim Surface Treatment Rule was achieved by September 16, 2002. On October 28, 2002, EPA issued an Administrative Compliant, Findings of Violation, Notice of Proposed Assessment of a Civil Penalty and Notice of Opportunity to Request a Hearing (the Complaint )>