[en] The objectives of the verification activities were to provide independent document and field data reviews in evaluating the adequacy and accuracy of the contractor's procedures and FSS results. The onsite verification survey was performed in order to generate independent radiological scan data and sample data (if necessary) for use by the DOE to verify that remedial actions were effective in reaching background levels. ORISE performed onsite verification survey activities of the Building 301 footprint area at ANL on September 14, 2009. The onsite activities included collecting independent gamma scan measurements. The survey results did not identify any locations of elevated radiation levels exceeding twice background within the footprint area. Following onsite activities, ORISE was provided a partial FSS laboratory data package to review. Upon identifying several technical issues with the analyses and reporting, ORISE was informed that those FSS samples were being re-analyzed; however, DOE approved the backfill of the area on September 16, 2009 prior to receiving the re-analyzed results. The subsequent laboratory report for the samples that were re-analyzed was provided to ORISE on November 2, 2009 and although the Building 301 footprint area was already backfilled, the review determined the analytical results were acceptable.