One of the most common measurements used for quality control of earthfill placement is compacted density. The use of density testing for the control of fill placement and as a key indicator that material placed will meet specified parameters has broad application and a history of more than 50 years. A key to design and construction using RCC is the application of testing procedures for both laboratory and field density that is representative of in-place conditions. Several test methods developed over the last 20 years are described in this publication. Also included is information on soil mechanics and concrete methodology aspects of RCC as well as a discussion on various standard compaction methods.