As part of the West Coast Regional Carbon Sequestration Partnership (WESTCARB), Advanced Resources International, Inc. evaluated the CO2 storage potential of deep coal seams and interbedded sandstone saline aquifers in the Centralia-Chehalis basin of west-central Washington State. These reservoirs could be used for long-term geologic storage of CO2 captured from TransAlta’s 1,404-MW coal-fired steam power plant near Centralia, Washington.