Among the provisions of the Hazardous and Solid Waste Amendments of 1984 are minimum technological requirements for hazardous waste landfills, surface impoundments and waste piles. These provisions are found in Sections 3004(o) and 3015 of the Resource Conservation and Recovery Act (RCRA) and further defined in the Part 264 regulation and associated guidance. Any new surface impoundment must install two or more liners and a leachate collection system between such liners. The lower liner must be designed, operated, and constructed to prevent breakthrough of constituents over the period of operation, including any post-closure care period. A computer program, SOILINER, has been developed to assist in the evaluation of these liners. The program is for an IBM PC/XT and IBM PC/AT or compatible personal computer. Software description: The program is written in the Fortran programming language for implementation on IBM-PC-AT or XT or compatible using the DOS 2.1 (or higher) operating system. 256K bytes of core required. Hard disk required; Lotus 1-2-3 recommended for graphic output; Math co-processor chip and graphics board recommended.