Groundwater quality in the approximately 860-square-mile Madera and Chowchilla Subbasins (Madera-Chowchilla study unit) of the San Joaquin Valley Basin was investigated as part of the Priority Basin Project of the Groundwater Ambient Monitoring and Assess
Shelton, Jennifer L. jshelton@usgs.gov,Fram, Miranda S. mfram@usgs.gov,Belitz, Kenneth kbelitz@usgs.gov,et al. Status and understanding of groundwater quality in the Madera, Chowchilla Study Unit, 2008: California GAMA Priority Basin Project. 2013-01-01.