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A proposed ground-water-quality monitoring network for Idaho, which focuses on protection of the water in major aquifers, comprises 565 sites 557 are at existing wells and springs; 8 will require new wells to be drilled. Frequencies of sampling assigned are quarterly, semiannual, annual, an4 5 years at the different sites. Selected chemical and physical properties in the ground water will be monitored by using both laboratoryand field-analysis methods. Primary objectives of the network are to (1) enable water managers to keep abreast of the general quality of the State's ground water, and (2) serve as a warning system for undesirable changes in ground-water quality. Data were compiled for hydrogeologic conditions, ground-water quality, cultural elements, and pollution sources. A "hydrologic unit priority index" was calculated from these data to rank 84 areas (hydrologic units) of the State for monitoring according to pollution potential. Emphasis for selection of monitoring sites is on the 15 highest ranked areas. Twenty-seven of the 84 areas are ranked low and are not now considered for monitoring in the proposed network. In anticipation of funding and manpower limitations, three alternative levels of monitoring are proposed: (1) Monitor the 15 highest ranked areas, 426 sites; (2) monitor the 10 highest ranked areas, 350 sites; and (3) monitor the 5 highest ranked areas, 233 sites. Regardless of the level of monitoring adopted, it is suggested that all sites should be monitored at least once every 5 years. Ground-water-quality data were added to the Geological Survey's storage and retrieval system, WATSTORE (National Water Data Storage and Retrieval System), which presently (1919) contains water-quality, data for more than 2,200 wells and springs in Idaho. Potential for pollution is greatest in areas of privately owned agricultural land. Other areas of pollution potential are residential development, mining and its related processes, and hazardous waste disposal.

A proposed ground water quality monitoring network for Idaho