An update to the NATCARB Saline 10km grid was completed in May, 2022, and added to this submission. The following submission contains: - Natcarb_Saline_10km_v1502.shp - the original NATCARB saline 10km grid layer as defined in the NATCARB Atlas, 2015. - Natcarb_Saline_10km_Grid_Shapefile_3_31_2022.shp - an updated version of the 10km grid layer. All original columns are preserved, with additional data added in new columns, including lithology, depositional environment, porosity, permeability, depth, and thickness. All additional data added has a column stating the citation for the new information. Please see metadata file for additional information on the update. - ReadMe_Natcarb_EY21_Updated.docx - a read me metadata file that describes what was done for the update and contains all header information for the updated shapefile. - NATCARB_Saline_Poly_v1502.shp - the polygon shapefile for the NATCARB saline reservoirs, as published in the NATCARB Atlas, 2015.

The NATCARB Atlas 10km square grids covers saline basins within all Regional Carbon Sequestration Partnership (RCSP) domains in the US and parts of Canada. Each 10km grid contains information about the saline basin formation below. Attributes associated with each 10km grid are (with (Units, Attribute name) after): Partnership name (PARTNERSHIP) Resource/formation name (RESOURCE_Name) Resource area (square meters, RSC_AREA_C ) CO2 capacity estimate volumes (in metric tons per feature): vol_low (P10), vol_med (P50), and vol_high (P90) (based on Goodman et al. 2011) Depth to top of formation from surface (feet, depth_ft) Formation mean thickness (feet, thickness_) Mean salinity (TDS) (ppm, salinity_t) Mean pressure at top of storage resource (psi, pressure_p) Mean temperature at top of storage resource (degrees F, temperature) Mean porosity (percent, porosity_pct) Mean permeability (mD, permeability_mD) Assessed (1= yes, 0= volume estimates not made)

Layer should be used in ArcGIS to view. All attributes for the layer and units are described above.

Please note: not all grids have been assessed for storage estimates. For the grids that have been assessed, please refer to Goodman et al. 2011 "U.S. DOE methodology for the development of geologic storage potential for carbon dioxide at the national and regional scale" https://doi.org/10.1016/j.ijggc.2011.03.010