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contact waters may contain relatively high levels of fluoride, iron, man- <br />~ ganese, selenium, and sulfate. <br />• ~~ <br />~l <br />Figure 4-7 shows locations of groundwater quality monitoring sites. The <br />water quality characteristics for wells a[ each of [he ground-water <br />monitor sites are shown in Appendix D. Wells GA-1, GC-2, and GE-1 are <br />completed in the Upper Williams Fork. Well GD-1 is completed in the <br />Twentymile Sandstone, and Well GC-1 is completed in a high terrace <br />gravel. These wells were selected as representative of the groups of the <br />Trapper ?tine. <br />The standards [hat will be used for comparison in describing the existing <br />National Interim Primary Drinking Ldater Standards, <br />water quality are: <br />National Secondary Drinking [Dater Regulations, and <br />NAS/NAE Recommended Limits for Continuously-Used Irrigation ater. <br />These limits are shown in Table 4. <br />. ~ <br />-38- <br />