The 8000-series methods contain a lot of references, and usually don't have all the details of the extraction process and quality control requirements in them, but they do have references to the guidance methods that do contain the relevant information.
From 8310:
7.1 Extraction:
7.1.1 Refer to Chapter Two for guidance on choosing the appropriate extraction procedure. In general, water samples are extracted at a neutral pH with methylene chloride, using either Method 3510 or 3520. Solid samples are extracted using either Method 3540 or 3550. To achieve maximum sensitivity with this method, the extract must be concentrated to 1 mL.
From 3520C:
8.0 QUALITY CONTROL
8.2 Refer to Chapter One for specific quality control procedures and Method 3500 for extraction and sample-preparation procedures.
From 3500C:
8.0 SAMPLE COLLECTION, PRESERVATION, AND STORAGE
See the introductory material to Chapter Four, "Organic Analytes," and the specific methods to be employed.
And finally, in SW-846, Chapter Four, "Organic Analytes", see Table 4-1.
http://www.epa.gov/osw/hazard/testmetho ... /chap4.pdf
That table shows the standard 7/40 holding times.
Please, anyone out there, correct me if I'm wrong.