Qualitative Use Assessment: Report summarizing the major uses of a pesticide including percentage of crop treated, and amount of pesticide used on a site. 

Quality Assurance/Quality Control: A system of procedures, checks, audits, and corrective actions to ensure that all EPA research design and performance, environmental monitoring and sampling, and other tech- nical and reporting activities are of the highest achievable quality. 

Quench Tank: A water-filled tank used to cool incinerator residues or hot materials during industrial processes.