West Central Phoenix — West Grand Avenue | Site Hydrogeology

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 and gravelly sand zones.

Due principally to the lining of the SRP Grand Canal to the north of the site and the ongoing drought, depth to groundwater has declined considerably in the past several years. In 1992, the depth to groundwater was approximately 98 feet below ground surface (bgs), and by April 2002, it was approximately 124 feet. The most recent depth to groundwater was 151.05 feet bgs. Groundwater flow is to the south-southwest beneath the site.