This action promulgates test methods 310 a, b and c, 312 a, b and c, and 313 a and b for the detection of residual amounts of hazardous air pollutants (HAPs) in conjunction with the recently issued National Emission Standards for Hazardous Air Pollutants (NESHAP) for the Manufacture of Major Elastomers, (commonly referred to as Polymers and Resins I). The methods were adapted from industrial methods submitted by the facilities in the polymers and resins industry and were published for public comment as part of the Polymers and Resins I proposed rulemaking action. The methods will be promulgated, in conjunction with the Polymers and Resins I rule, as EPA methods 310 a, b and c, 312 a, b and c, and 313 a and b, and will be codified at 40 CFR Part 63, Appendix A. Methods 310 a, b, and c are applicable for determining the residual amount of solvent (hexane being the most commonly used solvent) and diene monomer in ethylene-propylene terpolymer (EPDM) as produced in the solution polymerization process. Methods 312 a, b, and c are applicable for determining the residual amount of styrene in styrene- butadiene rubber (SBR) as produced in the emulsion polymerization process. Methods 313 a and b are applicable for determining the residual amount of toluene, dimer, and styrene in polybutadiene rubber (PBR) and SBR crumb as produced in the solution polymerization process. All of the methods analyses are through the use of gas chromatography.