Previously, a cultural resource assessment of the east half of Block 2, Ninian Edwards Addition to the City of Springfield was conducted by Fever River Research to assess the impact of the proposed construction of the Abraham Lincoln Presidential Library’s parking garage on potential subsurface archaeological resources (Mansberger 2003).  The original plans called for the construction of the parking garage on the east half of the block, but subsequent plans were developed for the expansion of the parking garage on the adjacent west half of the block.  In compliance with both Section 106 of the National Historic Preservation Act and Section 707 of the Illinois State Agency Historic Resources Preservation Act, it was the responsibility of the Illinois Historic Preservation Agency to assess the impact of the proposed construction activity associated with the Lincoln Presidential Library’s parking garage on historic resources.  As the project area was located within an urban environment—and completely encapsulated by the built environment (buildings and pavements), a traditional Phase I archaeological survey was not possible.  In an effort to assess the proposed construction activity on the potential belowground subsurface resources within the project area, the IHPA contracted with Fever River Research to conduct a literature search to identify potential archaeological resources that might be expected within the project area.  This report summarizes the results of the literature search as well as presents a predictive model for potential archaeological sites within the half-block project area.  Subsurface archaeological investigations (consisting of a hybrid Phase I survey and Phase II testing strategy) were recommended and carried out during a two-week period in March and early April 2004.  Upon removal of asphalt and gravel parking lot overburden, a relatively thin historic midden overlying an intact nineteenth century ground surface was encountered throughout almost the entire area investigated.  Additionally, several subsurface features (including at least 33 privy pits, one cistern, several trash pits, and the brick foundation walls of an early nineteenth century dwelling) were documented.  Based on the Phase II testing, several of these features appeared to date from the 1830s to 1840s period, and the site was determined eligible for listing on the National Register of Historic Places.  Phase III archaeological mitigation was recommended.