sentence1: 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) and true is true and true is true and true is true and true is true and true is true .
sentence2: The EPA's WET Interlaboratory Variability Study served as the reference for the upper and lower PMSD numbers.