One of the most important responsibilities of the Love Canal prime contractor was the institution and maintenance of a quality assurance program. An important objective of the quality assurance program was to alert the subcontractors to the importance of high quality work on their part and to demonstrate continuing concern for quality throughout the program. Measures taken to accomplish this included the provision of: general QA/QC requirements in the Requests for Proposal (RFP) for all technical work to be subcontracted; EPA's specific internal QC requirements in each analytical subcontract document; the requirement for subcontractor QA Plans; QC Coordinators with expertise in each technical area; written sampling and analysis procedures including QC requirements and planned corrective actions; Performance Evaluation and QC check samples for analytical work and, perhaps most important, continuing communication between GCA and its subcontractors. This document describes the quality assurance effort by the prime contractor. Also included are examples of problems during the study and their resolutions.