| This paper provides EPA's analysis of the data to determine carbon sequestration rates at three diverse sites that differ in geography/location, weather, soil properties, type of contamination, and age. The first site, located at high elevation in Leadville, Colorado, suffered from contamination due to mining. The site was amended with biosolid cakes, biosolids pellets, biosolid compost, and limestone starting in 1998. The second site, located in Stafford County, Virginia, had highly reduced, high-sulfur soils resulting from construction activities for an airport at the site. When exposed to air, these soils rapidly acidified, causing acid runoff that contaminated local streams. The site was amended with biosolids in 2002. The third site, Sharon Steel, is located at the border of Pennsylvania and Ohio and was contaminated through the application of by-products associated with manufacturing steel. At Sharon Steel, soil amendments were applied as part of a field demonstration project in 2008. |