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Hold cursor over bolded text below to show well network. Ground-Water Chemistry Ground-water studies focused exclusively on sand and gravel outwash deposits, known as the Buried-Valley Aquifer System, a major source of drinking water aquifer in the study unit. Ground-water studies were designed to measure water-quality in: high-capacity supply wells next to large streams (supply wells); domestic wells screened at various depths in the aquifer (subunit study wells); shallow ground-water in areas overlain by agricultural or urban land use (agricultural and urban land-use wells); shallow parts of the aquifer where induced infiltration can result in transport of certain chemicals from streams to the aquifer; areas undisturbed by human activities (reference wells).

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