Classifying drinking water contaminants [[electronic resource] ] : for regulatory consideration / / Committee on Drinking Water Contaminants, Water Science and Technology Board, Board on Environmental Studies and Toxicology, Division on Earth and Life Studies, National Research Council

• Record Nr.: UNINA9910456041803321
• Pubbl/distr/stampa: Washington, D.C., : National Academy Press, 2001
• ISBN: 1-280-18476-0; 9786610184767; 0-309-56534-0
• Descrizione fisica: 1 online resource (255 p.)
• Disciplina: 363.6/1/0973
• Soggetti: Water - Pollution - United States; Drinking water - Contamination - United States; Drinking water - Health aspects - United States; Electronic books.
• Lingua di pubblicazione: Inglese
• Formato: Materiale a stampa
• Livello bibliografico: Monografia
• Note generali: Description based upon print version of record.
• Nota di bibliografia: Includes bibliographical references (p. 186-207).
• Nota di contenuto: ""Classifying Drinking Water Contaminants for Regulatory Consideration""; ""Copyright""; ""Preface""; ""Contents""; ""Executive Summary""; ""RECOMMENDED APPROACH FOR THE DEVELOPMENT OF FUTURE CCLS""; ""Two-Step Approach""; ""Sociopolitical Considerations""; ""Universe to PCCL""; ""PCCL to CCL""; ""Contaminant Attributes""; ""Developing and Implementing a Prototype Classification Approach""; ""IDENTIFYING AND ASSESSING EMERGING WATERBORNE PATHOGENS""; ""Virulence-Factor Activity Relationships""; ""Framework""; ""Feasibility""; ""VFAR Conclusions and Recommendations""; ""1 Drinking Water Contaminant Candidate List: Past, Present, and Future""""INTRODUCTION""; ""DEVELOPMENT OF THE 1998 CCL""; ""IMPLEMENTATION STATUS OF THE 1998 CCL""; ""Research Plan for 1998 CCL""; ""LIMITATIONS OF THE FIRST CCL DEVELOPMENT PROCESS""; ""RELATED SDWA PROGRAMS""; ""National Drinking Water ; Contaminant Occurrence Database""; ""Unregulated Contaminant Monitoring Regulation""; ""IDENTIFYING AND SELECTING CONTAMINANTS FOR FUTURE CCLS""; ""PERSPECTIVE OF THIS REPORT""; ""2 Sociopolitical Considerations for Developing Future CCLs""; ""INTRODUCTION""; ""LIMITATIONS OF THE FIRST CCL DEVELOPMENT PROCESS""""USE OF SOUND SCIENCE IN FUTURE REGULATORY DECISIONS""; ""NATURE OF THE TASK""; ""RISK PERCEPTION""; ""PROTECTION OF VULNERABLE SUBPOPULATIONS""; ""TRANSPARENCY AND PUBLIC PARTICIPATION""; ""Transparency""; ""Public Participation""; ""SUMMARY: CONCLUSIONS AND RECOMMENDATIONS""; ""3 The Universe of Potential Contaminants to the Preliminary CCL""; ""INTRODUCTION""; ""TWO-STEP APPROACH""; ""THE UNIVERSE OF POTENTIAL DRINKING WATER CONTAMINANTS""; ""DISTINGUISHING THE PCCL FROM THE UNIVERSE""; ""GUIDELINES FOR DEVELOPING SCREENING CRITERIA""; ""Criteria for Potential and Demonstrated Health Effects""""Criteria for Potential and Demonstrated Occurrence""; ""FATE OF THE PCCL""; ""SUMMARY: CONCLUSIONS AND RECOMMENDATIONS""; ""4 PCCL to CCL: Attributes of Contaminants""; ""INTRODUCTION""; ""OVERVIEW OF CONTAMINANT ATTRIBUTES""; ""Severity""; ""Potency""; ""Prevalence""; ""Magnitude""; ""Persistence-Mobility""; ""LESSONS LEARNED IN APPLYING THESE CRITERIA""; ""Monitoring Data""; ""Potency Compared to Monitoring Data""; ""Severity""; ""Severity and Potency""; ""SUMMARY: CONCLUSIONS AND RECOMMENDATIONS""; ""5 PCCL to CCL: Classification Algorithm""""INTRODUCTION""; ""OVERVIEW OF CLASSIFICATION SCHEMES""; ""Expert Judgments""; ""Rule-Based Methods""; ""Prototype Classification Methods""; ""Which Strategy to Use?""; ""ILLUSTRATIVE EXAMPLE OF A PROTOTYPE CLASSIFICATION SCHEME FOR CCL CONTAMINANTS""; ""The Training Data Set""; ""Attribute Scoring""; ""Prototype Classification Functions""; ""Classification Results Using a Linear Classifier""; ""Classification Results Using a Neural Network Classifier""; ""DEMONSTRATED USE OF THE TRAINED CLASSIFIER""; ""Examination of Misclassified Contaminants""; ""Validation Test Cases""