CWA Methods Support Documents
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Mercury
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Oil and grease
- Analytical Methods for Mercury in National Pollutant Discharge Elimination System (NPDES) Permits; Memorandum (pdf)
- Analytical Method Guidance for EPA Method 1664A Implementation and Use (pdf)
- Preliminary Report of EPA Efforts to Replace Freon For The Determination of Oil and Grease (Rev. 1) (pdf)
- Report of EPA Efforts to Replace Freon for the Determination of Oil and Grease and Total Petroleum Hydrocarbons: Phase II (pdf)
- Modifications to Method 1664A; Memorandum (pdf)