Oak Ridge National Laboratory prepares a report annually as mandated by the Toxic Substances Control Act ('I'SCA) that summarizes records required of owners/operators of facilities where PCBs are in use.. This report provides information on PCB and pCB-contaminated equipment in use or removed from service and PCB wastes generP._ed, stored, and shipped off-site for treatment and disposal during the time period February 6, 1990, through Dec.ember 31, 1990, as required by the revised TSCA regulations described in the December 21, 1989, Fe.clcral :Re_istcr (54 FR 52716). vii ACKNO_G_ TI_ report is largely an update by ]'. K. Cn-ecr, Jr., and R. C. Foley of the PCB Annual Report for 1989 (OR./cL/rM-II665). Special thanks are g/ven to L. C. Wesley, S. R. AfJchaud, and L. Oggs for compiling, maintaining, and validat/ng the Hazardous Waste Tracking System and the PCB Tracking System from which the data were extracted for inclusion in this report. Thanks are also given to the ORNL staff who contributed to the final compilation of this report: V. ]vi. Mayfield and 3. L Reid. ix 1.0 INTRODUCTION Polychlorinated biphenyls (PC'_s) are a family of chlorinated aromatic hydrocarbons used extensively prior to 1979 in electrical equipment,, heat transfer systems, fire retardanu, and plasticiz4:n. PCBs can be detrimental to humans and the environment because of their toxicity, penistence, and tendencyto bioaccumu]ate. Humansexposedto PCBs candeve]opdermato]ogic symptoms, follicular keratitis, excessive eye discharge, swelling of theeyelids, and nervous system symptoms(I.ARC1978). Inaddition, available dataaresufficient tosupponthecarcinogenicity of PCBs in animals but are inadequate to demonstrate their carcinogenicity in humans (IARC 1982). Congress mandated the control of PCBs under the To:dc Substances Control Act (TSCA) of 1976, Public Law 94-469, Section 6(¢).To enforc,¢ TSCA.,theE_vironmental Protection Agency (EPA)promulgated regulations underTitle 40oftheCode ofFeaeral Regulations (CFR), Pan 761. Subpan A of 40 CFR 761 provides general information, including definitions and references. Subpart B outlines requirements forthemanufacture, processing, distribution, and useofPCBs. Subpart C governs marking andlabeling requirements, and Subpart D identifies storage anddisposal requirements. Subpart E regulates commercial exemptions forthemanufacturing, processing, and distribution ofPCBs. Subpart G details requirements forspill cleanup policy. Subpart J contains recordkeeping andreporting requirements for ownersoroperators offacilities using orstoring PCBs, and requires an annualreport to be on file by July I covering the previous calendar year. _ Subpart K requires PCB waste disposal records, manifesting records, and exception reports forPCB wastes whicharenot disposed ofwithin one yearofgeneration. AppendixC contains copies "_f ORNL manifests, certificates ofdestruction, andone exception report for1990. Oak RidgeNational Laboratory (ORNL) isamultipurpose research anddevelopment facility owned and operated by the Department of E...