As part of an ongoing effort in a heirarchical scheme to demonstrate the applicability of present U.S. Environmental Protection Agency (USEPA) analysis methods for the Resource Conservation and Recovery Act (RCRA), the suitability of SW-846 Method 3510 for the determination of hazardous, organic compounds was evaluated. The compounds selected for the study included 153 semivolatile organic compounds on Appendix VIII to 40 CFR Part 261 (including the 'Michigan List', Federal Register, December 21, 1984), that is a previous part of the program had shown to be amenable to gas chromatographic/mass spectrometric (GC/MS) analysis. The extraction efficiency from water and seven-day aqueous stability of the compounds were determined to provide in part, basic information for the finalization of a subset of Appendix VIII suitable for groundwater monitoring.