they were not readily searchable or cataloged in an organized fashion for research. To facilitate future exposure-assessment efforts, the committee strongly recommends that a comprehensive, accessible database of water-quality measurements (including data from remedial investigations) be created and maintained. Such a database should include information on sample location, date, analytes measured, laboratory quality-control information (including limits of detection), and other information relevant to exposure assessment that relies on environmental samples collected in the course of investigating water, soil, and air quality at Camp Lejeune.

Because of the sparseness of water-quality data and the insufficient ability of water-quality modeling to make up for the absence of information, most exposure estimates in epidemiologic studies at Camp Lejeune will rely heavily on unverifiable assumptions and projections. Therefore, the most useful exposure assessment will likely be relatively crude and based for the most part on ascertaining the most likely time period and location (water supply system) of contamination, typical locations the study participant spent time on the base (for example, residence, school, daycare, workplace), and crude categorization of personal water-use activities during the exposure period.

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