The following sources of information form much of the framework for environmental sample collection and analysis in a variety of matrices -
Approved Clean Water Act Test Methods for Inorganic Non-Metals
Approved Clean Water Act Test Methods for Metals
Approved Clean Water Act Test Methods for Organic Compounds
The SW-846 Compendium consists of over 200 analytical methods for sampling and analyzing waste and other matrices.
Standard Operating Procedures for Field Activities
OSHA Index of Sampling and Analytical Methods
NIOSH Manual of Analytical Methods 4th edition