Study Boundary and Grid Cells for the North and South American, Cosumnes, and Mokelumne River Watersheds Shallow Aquifer Study Unit
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The U.S. Geological Survey collected groundwater samples from 67 domestic wells and 1 spring used for domestic supply in Placer, El Dorado, Amador, and Calaveras...
美国地质调查局（U.S. Geological Survey）从普莱瑟、埃尔多拉多、阿马多尔以及卡拉韦拉斯县的67口家用井和1处用于生活供水的泉眼中采集了地下水样本……
