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. The site is underlain by primarily sandy silts and silty sands with interbedded clay layers. The depth to groundwater in the area is approximately 85 feet below ground surface. Groundwater flow in the area of the site is currently to the north-northeast.