NYC-WTC_000233682

NYC 9/11 Public Portal Document

response guidelines

• Identify sites and initiate site • Estimate affected area and isolate • Characterize affected area. characterization. if possible. • Revise public health protection 1 • Begin analysis of available • Implement appropriate public measures as necessary. water quality data. health protection measures. • Provide alternate water supply. s • Investigate unusual • Plan for alternate water supply. • Plan remediation activities. p consumer complaints. • Analyze samples. o • Consult external information • Perform site characterization at sources. additional investigation sites. s

Consumer Complaint

THREAT EVALUATION STAGE Possible ________ Credible_______ Confirmatory I • Compilation of consumer • Results of site characterization at • Results of sample analysis. n complaints, including selected investigation sites. • Contaminant information. geographic distribution. • Summary of historic consumer • Results of site characterization f • Recent water quality data complaints. at other investigation sites. Bl that may be associated with • Results of consumer interviews. • Input from primacy agency r complaints. • Contaminant information. and public health agency. o • Operational information coiTesponding to the time of Bl the unusual complaints. t i o ■ • Are the complaints unusual? • Do site characterization results • Were unusual contaminants reveal signs of contamination? detected during analysis? Do i • Could operational changes be the cause? • Are other consumers in the area they pose a risk to the public? • Could changes in source experiencing similar water • Do site characterization results water quality be the cause? quality? reveal signs of contamination? 1 • Are the complaints clustered • Are the unusual complaints • Is contamination indicated by a in a specific area? significantly different from “preponderance of evidence?” • Are complaints from typical complaints? habitual complainers? • Are the complaints indicative of a specific contaminant? i • Is there anything unusual about the water quality in the area? IB

75 Interim Final - August 2004

CITY_21MC100_004992414

NYC-WTC_000233757