A Phase I survey is designed to identify all potentially significant archaeological or historical resources within a project area. It includes background research on the history and environment of the property, as well as on studies completed in the vicinity of the property. The research is followed by a systematic subsurface survey and surface inspection of the project impact areas. Testing may be stratified to emphasize the areas most likely to contain archaeological or historical resources. Additional testing may be completed to delineate resource boundaries and identify the nature of these resources. Phase I surveys include recording any structures (buildings, roads, canals, railroads, bridges, etc.) over 50 years in age.