The U.S. Environmental Protection Agency's (USEPA's) Hazardous Waste Engineering Research Laboratory (HWERL) has prepared a Technical Guidance Document, at the request of the Office of Solid Waste (OSW), on construction quality assurance (CQA) for hazardous waste land disposal facilities. The document has recently undergone public comment and is currently being revised in accordance with those comments received. The paper summarizes the contents of the CQA Technical Guidance Document. It describes the elements of a CQA plan that should be addressed when preparing the permit application for a specific site. The CQA Technical Guidance Document will assist permitting agencies, facility owner/operators, design engineers, CQA personnel, and construction contractors in ensuring, with a reasonable degree of certainty, that the completed facility meets or exceeds all design criteria, plans, and specifications.