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• irrigation season) up to .593 (SW-N6, non-irrigation season). <br />• <br />Based on the aforementioned results, it was concluded that discharge (flow) had no relationship <br />with TSS. It should be noted that TSS values were determined by an outside laboratory using a <br />small yet proportionally divided portion of each water sample taken at each site. However, <br />considering the magnitudes of TSS determined for sites at the New Horizon 2 mining area (10 to <br />100 mg/I), the laboratory analyses were well within reason. <br />Discharge probably had some influence (relationship) on TDS concentration, but the regression <br />analyses for all sites during both seasons indicated that the relationship was inconsistent and still <br />inconclusive. Finally, there appeared to be no relationship between TSS and TDS. TSS values <br />have only occasionally exceeded 500 mg/{ at any monitored site, likely resulting in very few <br />instances where the suspended solids in the flow influence TDS by adsorbing ions and reducing <br />the dissolved chemical load. <br />SURFACE WATER SUITABILITY <br />This section discusses the suitability, present use and potential use of surface water monitored at <br />stream sites at the New Horizon 2 mining area. The suitability of surface water is discussed by <br />comparing historical water quality data for each site with the most stringent state or federal <br />standards established for: 1) drinking water; 2) agricultural water; and 3) livestock drinking water. <br />Also, surface water is discussed in relation to receiving stream standards applicable to the San <br />Miguel River as adopted by the Colorado Department of Health (CDOH, 1983 revised, 1986). <br />Surface water use, both present and potential, is described in relation to each water standard <br />category. <br />Surface water at all stream sites, except SW-N104, SW-N105, and SW-N106, was found to be <br />unsuitable for drinking water because of sulfate and manganese excedences. Lead and iron <br />standards were exceeded at four of the sites, while pH and nitrogen-ammonia (NH,) were <br />exceeded at three and one stream monitoring site, respectively. Interestingly, the three sites <br />located on the West Lateral irrigation ditch ail fell within the drinking water standards. Historically <br />and presently, irrigation waterdelivered by the West Lateral has been and currently is used by local <br />• residents as a source of drinking water. Sulfate and manganese are commonly exceeded at all <br />REVISED JULY 2006 2.04.7-40 <br />