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Well GW-N22 monitored the water quality in the alluvial aquifer along Calamity Draw. This well has <br />been replaced by wells GW-N39 and GW-N40 <br />The alluvial aquifer along Calamity Draw has a calcium magnesium sulfate water type both during <br />periods of irrigation and no irrigation. A slight lowering of TDS occurs during non-irrigation periods. <br />The mean TDS when irrigation is occurring is 3,349 mg/I and the mean TDS during periods of no <br />irrigation is 3,204 mg/I. Calcium and sodium concentrations increase slightly during periods of no <br />irrigation. The pH of the water at Well GW-N22 ranges from 7.2 to 7.7 with the mean value being <br />7.41. <br />A larger water quality data base is necessary to determine if there is any seasonal water quality <br />variability in the alluvial aquifer irrespective of the general irrigation effects. There is a suggestion <br />of chemical trends during periods of irrigation. Calcium and bicarbonate levels are decreasing <br />slightly with time. <br />The alluvial aquifer water exceeds the CWQCC agricultural standard for manganese. The water <br />is acceptable for use as livestock drinking water. Measurable trace element concentrations in the <br />alluvial aquifer include aluminum, boron, fluoride, lithium, manganese, nitrate, vanadium and zinc. <br />Fourwells (GW-N15, GW-N18, GW-N18P1 and GW-N21) monitored the overburden waterquality, <br />in the New Horizon 2 mining area. The well locations are shown on Map 2.04.7-1 <br />The four overburden monitoring wells exhibited two water types during periods of irrigation. Well <br />GW-N15 showed a magnesium sulfate type water and Wells GW-N18 and GW-N21 showed a <br />calcium magnesium sulfate water type. During non-irrigation periods, none of the wells changed <br />in water type. Measurable changes in TDS levels did occur when comparing irrigation versus <br />non-irrigation periods. The TDS at Well GW-N15 decreased, and the TDS at Wells GW=N18 and <br />CW-N21 increased during periods of no irrigation. The greatest change in TDS occured at Well <br />GW-N15 where there was a 1,662 mg/I drop in TDS during non-irrigation periods. Mean TDS <br />levels for the three overburden wells (GW-N 15, GW-N18 and GW-N21) during periods of irrigation <br />and no irrigation were 8,310 and 6,648 mg/I, 2,527 and 2,832 mg/I, 3,154 and 3,450 mg/I, <br />respectively. <br />Revised 25 Jul 2002 2.04.7-13 <br />