Precipitation Chemistry Quality Assurance Project (PCQA) PCQA operates the external quality assurance (QA) programs for the National Atmospheric Deposition Program (NADP). |
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National Field Quality Assurance Project (NFQA) NFQA was created to provide quality-assurance reference samples to field personnel who make water quality field measurements. The project monitors the proficiency of alkalinity, pH, and specific conductance measurements determined by water quality field analysts. |
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National Atmospheric Deposition Program | National Water Quality Laboratory | USGS Precipitation Chemistry Page | |