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-4- Mean zinc and iron concentrations are fairly high (1154 mg/1 and 1285 mg/1) in 1984. While zinc levels are high they are still below the National Primary Drinking Water Standards. Iron levels significantly exceed these standards, (300 mg/1 ). However, baseline data submitted in Table III-10 (Mine Permit), indicates that zinc and iron levels exceeded secondary Federal Drinking Standards. Middle Sandstone Three wells completed in the middle sandstone (TR-4, TR-7a, and 81-01) are monitored annually for full suite analysis and quarterly for field parameters. Wells 83-01, 83-02 and 83-03 are monitored monthly for field parameters. Mean T.D.S. for wells TR-4, TR-7, and 81-01 in 1984 was 140 mg/1 and in 1983 the mean T.D.S. was 253 mg/1. The mean pH in 1984 was 9.1 and in 1983 it was 9.5. NA and HC03 are the predomina te ions making the water a NAHCO3 chemical type. Minor constituents and trace elements are low Mean iron levels in except for iron and lead and within acceptable limt 1984 wer 2370 m /1 s ~ ~ ' . r r Sta 7 ti D i ki W t d d (300 r J 1-r M n l ad level ~r~ a p , y over una r n ng a e n ar s, - ea e s \ were mg/1 hich are 3 times the acceptable standard, 50 mg/1. Baseline ~ dat a in icates that iron and lead levels exceeded primary and secondary (~ Federal Drinking Standards. Twenty-Mile Sandstone Two wells completed in the Twenty-Mile Sandstone (259 and No. 9) are sampled annually for full suite parameters and quarterly for field parameters. Mean T.D.S. for the above wells in 1984 was 337 mg/1 while in 1983 it was 372. The mean pH in 1984 was 8.2 and in 1983 it was 7.8. The water is chemically a CaHC03 type with Ca and HC03 as the predominate ions. There has been no degradation in water quality from 1983-1984. Minor constituents and trace elements are low and in acc ptable limits All three wells completed in the White Sandstone are sampled on an annual basis for full suite parameters and on a quarterly basis for field parameters. Mean T.D.S. concentration for the above wells in 1984 was 853 mg/1 and in 1983 was 822 mg/1. The mean pH was 9.2 in 1984 and 8.9 in 1983. Chemically, the water is a NaHCOg type with Na and HC03 as the predominate ions. All minor constituents and trace elements are low and within acceptable limits. except for iron. Mean iron levels in 1984 wer 505 mg/1 ch is 15 times the acceptable standard. G ~ ~ Q., White Sandstone ~1~