The Nuclear Regulatory Commission (NRC) has received, by letter dated May 12, 2011, a license amendment application from ExxonMobil Corporation (ExxonMobil or Licensee), requesting to amend their existing alternate concentration limits and to extend the NRC Long-Term Surveillance Boundary at its Highland Uranium Mine and Mill site located in Converse County, Wyoming. License No. SUA-1139 authorizes the Licensee to possess byproduct material resulting from past operations of its Highland facility until site reclamation is adequate. The amendment provides a supplemental groundwater point of compliance (POC) well and new point of exposure monitoring locations and updates alternate concentration limits for uranium at some existing POC wells and at the proposed POC well. The amendment also proposes to expand the Long-Term Surveillance Boundary to include the Highland Pit Lake and the Southeast Drainage.