Data Recovery, an extensive and intensive archaeological excavation, may be necessary when significant archaeological sites cannot be avoided due to the location of the site within the project area or the nature of the development occurring.

Archaeological Data Recovery generally involves excavation of only a small portion, about 15% or so, of the entire site. This percentage provides us with a good representation of the diversity of artifacts and features that could potentially occur.

At the completion of the Data Recovery the site is considered mitigated. Once the completion memo is approved by the MHC, the project can usually proceed. The time required to conduct the field investigations necessary for a Data Recovery varies with the size and intensity of the site to be investigated and may last up to three months or more .