1 Lower and upper PMSD bounds were determined from the 10th and 90th percentile, respectively, of PMSD data from EPA's WET Interlaboratory Variability Study (USEPA, 2001a; USEPA, 2001b).
The data obtained from the EPA's WET Interlaboratory Variability Study was considered the most reliable and therefore used to establish the upper and lower PMSD bounds.