[en] The Draft Supplement Environmental Impact Statement (SEIS) for WIPP does not provide adequate justification to support the proposed action of shipping up to 620,000 cubic feet of transuranic (TRU) waste to WIPP before demonstrating compliance with the Environmental Protection Agency's (EPA) Standards for Management and Disposal of Spent Nuclear Fuel, High-Level and Transuranic Radioactive Wastes. The ''alternative action'' of shipping no waste to WIPP prior to demonstrating compliance with the EPA Standards has been dismissed without sufficient discussion and justification. The document contains mistakes in calculations, reflects an erroneous knowledge of the history of the project, presents tables without units, and displays an indifference to the statistical precision of predictions. It also does not adequately address the environmental impacts of the potential failure to complete the demonstration of compliance with the EPA Standards by October 1993. By comparison, DOE plans to complete the demonstration of compliance with the same standards before starting construction of the high-level waste repository in Nevada. These two diametrically opposed approaches by DOE, for WIPP and for the Yucca Mountain repository, need to be addressed