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Tuttle Draw. Site SW-Nt is established in Tuttle Draw upstream of the eastern permit <br />• boundary of the Nucla Mine. Water quality at this site has been monitored since April of <br />1980 (see Appendix 7-7). Table 7-43 presents a statistical summary of historic water <br />quality data collected at Site SW-Nt, Figure 7-24 presents a Schoeller diagram of mean <br />milliequivalent values for the major anions and cations for Doth the irrigation and <br />non-irrigation periods at SW-N1, <br />During both the irrigation and non-irrigation seasons, SW'Nl exhibits a magnesium calcium <br />sulfate water type (see Appendix 7-8). From Figure 7-24, it is evident that although an <br />increase in each ion (milliequivalents) occurs during periods of no irrigation, the <br />percentage of each remains consistent throughout the year, resulting in similar water <br />types during both seasons. <br />pH values at SW-Nt average 8.06 and 8.09 units during the irrigation and non-irrigation <br />seasons, respectively. pH has not been measured lower than 7.0, and the highest pH <br />recorded at SW-N1 was 8.9 units during the period of no irrigation. <br />TDS generally averages almost double during periods of no irrigation at Site SW-N1 (1535 <br />mg/1 versus B91 mg/1 during the irrigation period). TDS ranges between 360 and 1992 mg/1 <br />from about mid-April through mid-October, and ranges from 865 to 2336 mg/1 during the <br />non irrigation period. This logically results from the higher level s of the major ions <br />during periods of no irrigation as depicted on Figure 7-24. <br />Total suspended solids (TSS), total iron (FeT) and dissolved iron (Fe0) all average lower <br />concentrations during the non-irrigation period, TSS, FeT and FeD average concentrations <br />of 46,5 mg/1, ,78 mg/1 and ,07 mg/1, respectively, during the summer months (irrigation <br />period). From mid-October through mid-April, TSS, FeT and FeD average 21.7 mg/1, .84 mg/1 <br />and .04 mg/1, respectively. <br />Analyses for total manganese (MnT) show that, during the irrigation season, MnT averages <br />.19 mg/1. The average value of MnT is more than double at SW-N1 during periods of no <br />irrigation (,44 mg/1), <br />Site SW-N3 is situated on Tuttle Draw downstream of the Nucia Mine permit boundary, Water <br />quality has Deen monitored at this site since April of t980. Table 7-44 presents a <br />• statistical summary of historic water quality data collected at Site SW-N3. Figure 7-25 <br />7-123 Revised 04/11/88 <br />