Figure 8. Map of the distribution of water-chemistry sample collection sites (131 wells and springs sampled during this study)

Table D1. Water-chemistry data for selected wells and springs (131 wells and springs sampled during this study)

Table D2. Water-chemistry data for 728 wells and springs sampled during this and previous studies

Explanation of data sources for historical data for wells and springs sampled for water chemistry as part of previous studies

ARSENIC.TIF -- Digital image of Plate 1 from Hinkle, S.R., and Polette, D.P., 1999, Arsenic in Ground Water of the Willamette Basin, Oregon: U.S. Geological Survey Water-Resources Investigation Report 98-4205, 28 p., 1 pl.

The resolution of the image of Plate 1 may be insufficient to reproduce legible maps at larger scales.

ARSENIC.TFW -- File containing GIS information to register arsenic.TIF in ARC/INFO and other GIS software.

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