TM96-02 Lower Your Costs--Choose the right volatiles schedule.

Volatiles Schedule 2090 is a schedule that was developed for the determination of 60 known volatile compounds and includes a search for any additional unknown compounds (also referred to as "nontargets" or "tentatively identified compounds"). Volatiles Schedule 2091 is an identical schedule, except that it does NOT include the search for unknown compounds. Presently, Districts involved in field quality control (QC) for Schedules 2090 or 2091 send in an environmental sample, a spiked duplicate environmental sample, and a spiked triplicate environmental sample, spiked with the 60 known volatile compounds. Reports are sent from the NWQL detailing percent recovery of these spiked compounds. When Schedule 2090 is requested on each of these sample types, a report detailing any additional nontarget compounds found is sent for each of the samples (the sample, the spiked duplicate, and the spiked triplicate).