Posted at 19:58h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']The Upper Arkansas River Basin extends from the river’s headwaters downstream to and including Pueblo Reservoir. The “Eleven-Mile Reach” portion of the basin is the 500-year floodplain area that begins at the confluence of the Arkansas River and California Gulch, near Leadville, Colorado, and extends approximately 11 miles downstream. In 1999, a Memorandum...
Posted at 19:55h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']The Smoky Canyon Mine is an operating phosphate mine and mill operation in southeastern Idaho. Phosphate mining began in 1983 and will continue for the next 10 to 20 years. The primary environmental concern at this site is the potential for mobilization and transport of selenium from overburden waste rock to groundwater and...
Posted at 19:03h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']The Conda/Woodall Mountain site covers an area of approximately 4,600 acres, on both public and private lands, within the Southeast Idaho Phosphate Mining District. Historical phosphate mining involved excavation, handling, and on-site disposal of overburden rock containing trace amounts of selenium. The overburden disposal and reclamation practices used historically at this site have...
Posted at 18:59h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']Formation Environmental personnel have been involved in the Eastern Michaud Flats (EMF) Superfund Site project since 1994, initially assisting with the RI/FS phase and later serving as the technical lead for remedial design to address groundwater conditions.[/vc_column][/vc_row]
Remedial Design/Remedial Action
Formation personnel began leading groundwater remedial design activities for the eastern portion of the site...
Posted at 18:58h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']Formation Environmental designed and implemented a multi-year field and laboratory study to develop a selenium criterion for protection of aquatic life. Field studies characterized the ambient biological, chemical, and physical conditions in local streams. Laboratory toxicity studies assessed the potential of site-specific exposure to selenium to cause effects on trout reproduction.[/vc_column][/vc_row]
Eggs from two...
Posted at 18:21h
in
[vc_row][vc_column width='1/3'][/vc_column][vc_column width='2/3']
Remedial Investigation/Feasibility Study
Formation personnel conducted the Remedial Investigation and Feasibility Study (RI/FS) for the Butte Priority Soils (BPS) Operable Unit of the Silver Bow Creek/Butte Area Superfund site. The BPS Operable Unit is a large, complex mining site with commingled residential and industrial areas and associated human health and ecological risk issues. The...
