PRECISION. Precision estimates for PILS-IC, based on both propagation of precision for the intrinsic measured parameters and from collocated measurements, have been reported elsewhere (▇▇▇▇▇▇ et al. 2003). In contrast to that relatively short duration study with stable operating conditions, the East St. Louis deployment focused on sustained, routine measurements during which additional sources of imprecision can surface. Numerous factors influencing PILS-IC measurement precision are described by ▇▇▇▇▇▇▇▇▇▇▇ (2005; Chapter 5), which focused on a newer-generation version of PILS compared to the version deployed for the 2001-2002 measurement program. We have not fully assessed how the factors identified by ▇▇▇▇▇▇▇▇▇▇▇ (2005) affect the quantitative precision estimates for the earlier generation measurements and rely upon bias and comparability metrics to document the data quality.
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