Tentative Determination To Approve Site Specific Flexibility for Closure and Monitoring of the Picacho Landfill

The Environmental Protection Agency, Region IX, is making a tentative determination to approve two Site Specific Flexibility Requests (SSFRs) from Imperial County (County or Imperial County) to close and monitor the Picacho Solid Waste Landfill (Picacho Landfill or Landfill). The Picacho Landfill is a commercial municipal solid waste landfill (MSWLF) operated by Imperial County from 1977 to the present on the Quechan Indian Tribe of the Fort Yuma Indian Reservation in California. Imperial County is seeking approval from EPA to use an alternative final cover and to modify the prescribed list of detection-monitoring parameters for ongoing monitoring. The Quechan Indian Tribe (Tribe) reviewed the proposed SSFRs and determined that they met tribal requirements. EPA is now seeking public comment on EPA's tentative determination to approve the SSFRs.