Methods for Measuring Indicators of Intrinsic Bioremediation: Guidance Manual Intended to be a resource for practi tioners of intrinsic bioremediation in allowing selection of sampling and analytical methods that meet project - specific and site - specifi c needs in scoping field investigations, providing procedures that will improve the represen tative quality of the collected data, and considering potential biases intro duced into data through the sampling and analytical techniques employed in the site investigation