 As part of this restoration, CalTrans built the bird-refuge shell islands visible in the ecologically important Albany Mud Flats between Point Isabel and the Albany Bulb.East Bay Regional Municipal Utility District has a wet-weather sewage-treatment plant on the west end of the peninsula, but as of 2010 it is under state orders to close.A large Costco wholesale retail big-box store, the United States Postal Service Bulk Mail Center for San Francisco , and other businesses and stores are other occupants.