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What criteria were used to determine trends in groundwater?

criteria determine groundwater trends Used
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What criteria were used to determine trends in groundwater?

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This NAWQA study evaluated decadal-scale changes of nitrate concentrations in ground water samples collected from 495 wells in 24 ground studies across the Nation in predominantly agricultural areas. Each well network was sampled once during 1988–1995 and re-sampled once during 2000–2004.

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