Sediment Laboratory Quality Assurance Project Data, 1999 - 2024

This report evaluates laboratory measurements of suspended-sediment concentrations, total sediment mass, grain-size separation, and fine particle-size distributions for performance-testing samples prepared by the USGS Sediment Laboratory Quality Assurance (SLQA) project during 1999 – 2024 (study period). Forty-four different laboratories participated in the SLQA project during the study period (Table 1). Eleven of those laboratories reported particle-size distribution (PSD) results for SLQA samples during 2005 – 2024. Results were communicated by the USGS Quality Systems Branch to the participating laboratories within several months of the completion of each study. Laboratories use the SLQA results to monitor, maintain, and improve performance. There is no intension to rank the participating laboratories or assign laboratory-specific quality ratings to their data.

[
  "010:12"
]

[
  "geospatial"
]