Landfill Four is coated in plastic to prevent erosion and movement of the pollution from rain. The yellow posts in the background mark a test well that is used to monitor ammonium perchlorate levels in the groundwater.
Camp Bonneville is a decommissioned military installation in Clark County. The US Army used this forested area for target practice, including the firing of missiles. The camp was also used as a munitions landfill. These buried munitions have caused a toxic underground plume of ammonium perchlorate to develop.
