Identify a commonly used EPA SW-846 method for volatile organic compounds (VOCs) in soils/groundwater and briefly describe the method principle.

• A. SW-846 Method 8082 (HPLC) for VOCs.
• B. SW-846 Method 8260C (GC-MS); principle: extract VOCs via purge-and-trap or purge-and-trap GC-MS to quantify volatile organics.
• C. Method 5030: Atomic absorption for metals.
• D. Method 9060: Total organic carbon.

Answer: (B)