The site is located within the West Salt River Valley sub-basin of the Phoenix Active Management Area. The Salt River Valley is an alluvial filled basin located in the basin and range physiographic province. Based on the boring log for SRP Well 17.0E-8.0N, the site is underlain by silty sand and sandy silt with minor gravel lenses from ground surface to approximately 160 feet bgs. Conglomerate rock is encountered at approximately 160 feet bgs and bedrock is encountered at approximately 215 feet. Based on measurements from monitor wells, groundwater is encountered at approximately 55 feet bgs and groundwater flows to the southwest.