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Water Boards adds a "blank water modified" matrix for specific toxicity controls; staff flag inconsistent use of "lab water"
Summary
Staff added a narrowly defined "blank water modified" matrix for toxicity tests that use an alternate control (sample type code CNSL). Participants also questioned how labs use the existing "lab water" matrix and asked staff to update descriptions to reflect laboratory practice.
Staff announced a new matrix specifically to support a toxicity testing control used when an alternate control is required to test whether conductivity or salinity in a sample affects test organisms. Tessa said the sample-type code for that control is CNSL and that the new matrix — described as "blank water modified" — is "specifically for use with the CNSL test type sample sample types." She emphasized the matrix should…
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