This revised final report presents the results of previous investigations as well as the results of the Phase I and Phase II RI sampling and analysis for 11 SWMUs within three operable units at Tooele Army Depot (TEAD). TEAD is a National Priorities List (NPL) site under CERCLA. This requires that a Remedial lnvestigation/Feasibility Study (Rl/FS) must be performed. The Phase I and Phase II RI was designed to (1) fill data gaps identified from previous investigations, (2) determine the nature and extent of contamination, and (3) estimate risks to human health. The estimates of risk to the environment were assessed in a separate document, the TE4D Site-wide Ecological Risk Assessment Report. This report presents the results of the RI studies in four volumes. Volume I is the RI Addendum Report and Volumes 11,111, and IV are appendices of supporting information.