A series of 34 test burns was conducted between August 1983 and January 1984 in the pilot-scale rotary kiln incineration system at the USEPA Combustion Research Facility (CRF), using chlorinated benzenes as surrogate Principal Organic Hazardous Components (POHCs), over a range of feed compositions, POHC feed rates, rotary kiln temperatures, and afterburner temperatures. The CRF rotary kiln system consistently produced Destruction and Removal Efficiency (DRE) values above 99.99% for the chlorinated benzenes POHCs. DRE values below 99.99% were obtained during several types of failure mode simulations (flame-out in kiln or afterburner). A large number of Products of Incomplete Combustion (PICs) were produced and identified, a number of which are toxic or possibly carcinogenic. Deliberate reduction of excess air levels resulted in significant production of soot and PICs but did not produce higher levels of CO in the combustion gases. Hot-zone sampling just downstream of each of the two combustion chambers provided for the detailed study of PIC formation and will facilitate the future development of models of the incineration process. Helium injection techniques were used to determine combustion gas flow rates and to measure residence time distributions (which directly affect destruction efficiencies). This report was submitted in fulfillment of Contract 68-03-3128 by Versar, Inc. under the Sponsorship of the U.S. Environmental Protection Agency.