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RULE 2 PERMITS <br /> ru� xc'w^+^n..q��'w�:>w:mam*,�.t •iw>a's.•nt^wo�,•tss€v�iwR a,. �•w� i�6'sa»:•..o^..::r,. <br /> Heavy metals were also analyzed. Predictive capabilities were not as accurate but the mean values <br /> reported showed consistence with other studies. The results were reported as total recoverable <br /> metals in micrograms per liter(ug/1). Lead and cadmium were extremely low and the values were <br /> near or at the detection limits for Atomic Absorption Spectrophotometry. Zinc levels were <br /> moderate, around 10 ug/1, while iron and manganese were higher and more variable. Iron values <br /> for Taylor Creek and Wilson Creek were 40 ug/1 and 27 ug/1, respectively. Manganese levels <br /> were 7 ug/1 for Taylor Creek and 65 ug/1 for Wilson Creek. The reason for the higher manganese <br /> levels in Wilson Creek is not explained. <br /> Mean concentrations and levels of various constituents of concern were calculated along with <br /> corresponding maximums,minimums and standard deviations. Figures 2.04.7-6, 2.04.7-7, 2.04.7- <br /> 8, 2.04.7-9, 2.04.7-10 and 2.04.7-11 present this information for Wilson Creek at two locations <br /> and Taylor Creek at the mouth.These data were a result of calculations with the Statistical Analysis <br /> System (SAS) program on the USGS WRD computer. The data from which these figures were <br /> developed are found in Exhibit 7A. <br /> Figure 2.04.7-6, pH, shows no difference between each of these watersheds. The water is basic <br /> although minimum values near 7.0 reflect the effect of rainstorms in the permit area. Rain often <br /> has pH levels of neutral to acid conditions depending on the cloud and vapor sources. <br /> Figure 2.04.7-7 presents the total dissolved solids(TDS)calculations in mg/1 for these areas. TDS <br /> levels in all drainages are high except that there is a significant difference in the value for Taylor <br /> Creek. Taylor Creek TDS levels are lower than the other two drainages. This is due, in large part, <br /> to the tentative nature of streamflows and lack of a significant groundwater input.TDS is a function <br /> of contact time between the rock/mineral surface and the water molecule. In the Taylor Creek <br /> watershed this contact time is much less, as evidenced by the lack of flows most of the time. (See <br /> the Occurrence of Surface Water Section for a description of Surface Flows). Wilson Creek shows <br /> no appreciable difference from Goodspring Creek. <br /> Total Suspended Solids (TSS) are the most variable constituents of those shown. Figure 2.04.7-8 <br /> presents the results of the TSS calculations for Wilson Creek at two stations and Taylor Creek at <br /> the mouth. Maximum values exceed 10,000 mg/1 and minimum values approach zero. Mean <br /> values are 5000+ mg/1 for Wilson Creek and 1000+ mg/1 for Taylor Creek. Standard deviations <br /> further show the extreme, natural variability in this parameter as a function of precipitation, <br /> streamflow and season. <br /> Figures 2.04.7-9 and 2.04.7-10 present the data for total recoverable and dissolved iron (ug/1), <br /> respectively.Mean total recoverable iron concentrations are similar for all drainages and are within <br /> the range of values presented in earlier reports. The ranges and standard deviations also show the <br /> extreme natural variability of this metal in the mine area. Iron is a ubiquitous soil material and <br /> total recoverable values are pertinent only if highly visible iron deposits are noticed in the stream <br /> bed. Earlier field verification has shown that no such deposits exist. Therefore, iron is not a <br /> problem in the mine area. Dissolved iron values are low and average less than 50 ug/1. Drinking <br /> water and aquatic life standards are not exceeded. Based on the data,it is obvious that the majority <br /> Rule 2 Permits 2.04-28 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />