Respondent violated the TTHM/HAA5 monitoring requirements; TTHM compliance requirements; reporting requirements; notification requirements; and the remediation requirements. The AO requires compliance which will likely entail the installation of treatment. Cost estimate for direct environmental reduction based on the assumption that the system will install a .27 mgd package GAC plant. The preventative costs were calculated based on the cost to mail notification to the 2800 people served.