The Branch of Quality Systems (BQS) operates an Organic Blind Sample Project (OBSP).
One of the goals of the project is to document bias and variability for the National
Water Quality Laboratory (NWQL) through the use of blind quality assurance (QA) samples. From these summaries, districts can be informed of the NWQL's performance on QA
samples that parallel their own environmental samples.
The time series charts provide OBSP recovery inforamtion for every analyte at different concentrations for every method
OBSP assesses since January 1999. The charts exhibit a Locally Weighted Scatterplot Smoothing (LOWESS) line.
This line is used to help observe patterns and trends of the data over time. The time series charts also show bias
and variablility of the OSBP data. The most current time series charts in the table below will be overwritten quarterly and will contain data that is currently being reviewed.
All data is provisional and may change if the OBSP deems necessary.
Note: The OBSP reports may add to the interpretation of the data seen in the time series charts.
A red analyte name is an indication of a permanently estimated compound .
NOTE: Charts are presented as graphical images.
Use the back button on your browser to return to analyte choices or
use the links above the "Organic Blind Sample Project" tab.
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