ABSTRACT
Abstract ............................................................................................................................................77 4.1 Introduction ............................................................................................................................77 4.2 Overview of Metals and Their Compounds ........................................................................... 78
4.2.1 Overview of Physical Characteristics and Mineral Origins ....................................... 78 4.2.2 Overview of Behavior of As, Cd, Cr, Pb, and Hg ....................................................... 78
4.3 Description of Superfund Soils Contaminated with Metals ...................................................80 4.4 Soil Cleanup Goals and Technologies for Remediation .........................................................80 4.5 Containment ........................................................................................................................... 83
4.5.1 Process Description .................................................................................................... 83 4.5.1.1 Caps.............................................................................................................. 83 4.5.1.2 Vertical Barriers ........................................................................................... 83 4.5.1.3 Horizontal Barriers ......................................................................................84
