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General geology and hydrology
Chemical quality of ground water
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agricultural analyses average boron concentrations Boundary between areas Boundary of Tehama-Colusa calcium bicarbonate Canal Service Area CHEMICAL QUALITY Coast Ranges common area concentration anomalous Creek near Arbuckle Creek near Williams Cretaceous dissected uplands dissolved solids dissolved-solids concentration drinking water E X P L A N A T I O N Environmental Protection Agency exceeded the recommended fluoride ground water high concentrations hills and dissected justify grouping Location of sampled losing streams low alluvial plains magnesium magnesium bicarbonate methemoglobinemia mg/Q milligrams per liter nitrogen northern number of samples º º phytotoxic plains and fans Pleistocene Pliocene recommended limits residual sodium carbonate Sacramento River Sacramento Valley saline springs saline water salinity-low sodium hazard Salt Creek sample indicates Samples or variance sensitive crops SET IW soil southern square kilometers study area sulfate surface water Table Tehama-Colusa Canal Boundary Tehama-Colusa Canal Service U.S. Geological Survey Water Resources water samples