Manual ambient air sampling for VOCs was performed in accordance with EPA Method TO-15 by introducing air into a specially-prepared stainless steel canister. The evacuated canisters were supplied by EPA and were deployed using EPA's mechanical flow controllers. Flow controllers were cleaned using zero-air and their flow rates verified prior to the study. All of the canisters and mechanical flow controllers were cleaned before use. Flow rates thru the flow controllers were verified using a low-flow mass flow meter.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.