Importance of Particle Size-Fraction Analysis in Suspensions

environmental contamination, including the Barnstable Airport. We agree with Schaider et al. that these exposures may also contribute to the risk of breast cancer, although the earliest data we are aware of show no appreciable levels of volatile halogenated compounds in 1984 BWC water samples (Janik 1987). With only limited historical data available, we cannot be sure of the exact timing and geographic distribution of these other exposures. However, a very tight correlation would be necessary for these confounders to account for the observed associations with the BWPCF plume, and other exposures would have to date back to 1966. Fortunately, groundwater sources of drinking water in this area are subject to more protections today, and we agree that on going monitoring of known and emerging contaminants is important to maintain water quality. The authors declare they have no actual or potential competing financial interests.