Branch of Quality Systems


 

OBSP Data Assessment Tools

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.

All data is provisional and may change if the OBSP deems necessary.

A red analyte name is an indication of a permanently estimated compound .

Time Series Charts
False Positive and False Negative Charts
Recovery vs Concentration Charts
Box Plots of Analyte Recovery Over Time
One Graph Box Plot of an Entire Schedule
Analytes in Multiple Schedules
OBSP Products by Analyte

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URL: http://bqs.usgs.gov/index.php
Project Contact Information: stineman@usgs.gov
Project Contact Information: dbeaty@usgs.gov
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Page Last Modified: October 9, 2012