Historical mining in Lake County, Colorado, resulted in releases of tailings and water with high metals concentrations via California Gulch to the Upper Arkansas River and associated irrigation ditches. These releases created unvegetated mine waste deposits in the floodplain and agricultural land with areas of reduced or no productivity. This case study covers the site conditions and remedial efforts undertaken at the site.You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.
- California Gulch Lake County, Colorado Superfund Case Study (PDF)(8 pp, 4 MB, 2011, 542-F-11-007)