Quality Assurance for Environmental Measurements: A Symposium

acceptable accuracy activities addition analysis analytical appropriate assessment ASTM audit average calculated calibration certification changes chemical collection compared complete compounds concentrations conducted constituents containing corrective data quality described determined developed deviation Discharge distribution document effective elements Environmental Protection Agency error established estimates evaluation example facilities field filter flow identified indicated industry inspections International involved known laboratory lead levels limits major mean measurement metals methods monitoring needed NPDES obtained Office operation organic parameters particulate performance period permit permittees pollutants practice precision prepared present problems procedures quality assurance quality assurance program quality control range record reference materials Region relative reported representative Research response sampler samples solutions sources specific SRWS standard statistical studies Table techniques trace types U.S. Environmental Protection validation values waste