The Umatilla Chemical Depot (UMCD) is located in northeastern Oregon in the Umatilla and Morrow counties, approximately six miles southwest of the city of Umatilla, Oregon. The UMCD stores chemical agents in projectiles, ton containers, rockets, bombs, spray tanks, and land mines. The Umatilla Chemical Agent Disposal Facility (UMCDF), constructed within the UMCD boundaries, consists of numerous components, some of which are incinerators, brine reduction equipment (flash evaporators and drum dryers), waste storage areas and laboratory and support facilities. The purpose of UMCDF is to destroy the UMCD stockpile of chemical weapons.
The U.S. Army applied for a Hazardous Waste Permit in March 1995. Prior to issuance of the Hazardous Waste Permit, the Oregon Department of Environmental Quality (DEQ) conducted a pre-trial burn risk assessment (pre-RA). The pre-RA indicated the UMCDF would not have a significant adverse effect on human health or the environment (Ecology and Environment, Inc., 1997).
Following an extensive public comment period, the Environmental Quality Commission (EQC) and DEQ issued the permit (I.D. OR6 213 820 917) for the Storage and Treatment of Hazardous Waste (a hazardous waste permit) to the UMCD and the UMCDF on February 12, 1997. As a result of public comment, the EQC required that the UMCD and UMCDF establish a CMP. The purpose of the CMP is to confirm the projections of the pre-risk assessment. The CMP monitors for the presence of chemical warfare agents and other analytes to document that concentrations in soil, air, and biota before, during, and after UMCDF operations remain at or below the concentrations predicated in the pre-risk assessment.
The CMP is divided into three phases: baseline (before operations), operational, and post-operational monitoring. Baseline monitoring began in April, 1999 and concluded when agent operations began on September 7, 2004. Operational monitoring began on that date and will continue until the end of thermal operations. Post-operational monitoring will be conducted for one year following the conclusion of hazardous waste treatment operations at UMCDF. Sampling is conducted within three zones:
Primary activities for the CMP include: