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Parameter Number of Sites <br />pH (CDOH, GW, irrigation) 5 • <br />manganese (CDOH, SN, irrigation) 3 <br />dissolved solids (USEPA, irrigation) 4 <br />sulfate (California, irrigation) 6 <br />Review of this table indicates that only one CDOA surface water agricultural use <br />standard was exceedefl. The manganese standard was exceeded at three sites. <br />However, as noted previously is the ground water discussion, the relatively loa <br />CDOH standard of 0.2 mg/1, according to the EPA, applies to plants grown in <br />acidic soils. in alkaline soils, ae ere £ouad is the Yoast region, a more <br />appropriate (EPA) standard woulfl be 10 mg/1. The maximum maagnaeae valve <br />observed this year was only 0.371 mg/1. It should also be noted that these <br />sites, prior to mining, had experienced exceedences of the 0.2 mg/1 standard. <br />Finally, no exceedeacee of NPDES effluent criteria (Permit No. CO-0000221) <br />occurred this year. <br />Surface Nester Summary • <br />The Yoeet Mine PHC (PAP Tab 17, Attachment 17-5) predicts TDS increases to be <br />observed at various stream sites during the irrigation season (June-September). <br />The following table outlines those preflictioae along with Chia year's observed <br />averages. This table indicates that no TDS preflictioae were exceeded this year. <br />Stream 31te Predicted TDS values (mg/1) This years average TDS (mg/1) <br />YSGFS 1337 890 <br />NPDESI0 3938 1350 <br />NPDESI2 4291 925 <br />wSSF3 (Seneca II-N Bite) 2118 685 <br />Nester discharged from the Yoaet Niae ie not used directly for irrigation. • <br />Indirectly, although, water discharged from the mine ie significantly dilutefl by <br />12 <br />