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• Water a[ Site 12 during the 1440 water year was a NaM9C8-504 Cype (see Table 20, Appendix <br />A). A significant increase of TDS from that observed at upper Bond Creek again indicates <br />the alkaline and saline nature of Tuen Symile Park. Stock reservoirs also exist along Bond <br />Creek and cause a further increase in TDS values. TDS values fluctuate from year to year <br />for the same reasons previously discussed for Site 10. <br />1' 11 <br />u <br />Surface Water Site SW-S2-11. This site was instituted in May, 1987, and monitors Fish <br />Creek upstream of its confluence of Cow Camp Creek. It is monitored May through September <br />on a monthly basis. Water at this site is a M9CaN a-HL03504 type (see Table 20, Appendix <br />A). TDS values at this site have inyreased every year, likely due to relatively tower <br />annual precipitation since monitoring began. This site is upstream of mine discharges; <br />therefore, any changes of water chemistry are primarily the result of natural or <br />background conditions. <br />Surface Water Site SW-52-13. This site uas instituted in May 1987 and monitors Fish Creek <br />downstream of its confluence with Bond Creek. It is monitored May through September on a <br />monthly basis. Water at this site is a MgCa-S04 type (see Table 20, Appendix A). <br />Surprisingly, during 1990, the average TDS concentration was lower at this site (502 mg/l) <br />than it was upstream at Site SW-52-11 (547 mg/l), Four out of the five months monitoring <br />was conducted at both sites, the TDS at the lower site (Site 13) uas greater than the TDS <br />at the upper site (Site 11). However, in September, the upper site had a TDS of 896 mg/l, <br />while the lower site had a TDS of only 584 mg/l. Field conductivity values confirm that <br />these TDS values are correct (see Appendix E). During the entire period of record (since <br />May, 1987), TDS values a[ Site 13 were less than at Site 11 for 11 out of 20 samples, but <br />the SiCe 13 TDS values were only 92.4 to 99,7 percent of the Site 11 TOS values, except <br />for 5eptembe r, 1990 when the TDS value at Site 13 was 65.2 percent of the TDS measured at <br />Site 11. During that September sampling, Site 11 had a floe of 4.9 gpm (lowest recorded <br />flow), while Site 13 had a flow of 47.9 gpm. There is apparently an unknown source of <br />water that contributes to Fish Creek between the two monitoring sites [hat has e <br />measurable dilution effect on TDS during bas of low conditions along Fish Creek. The data <br />strongly indicates that the discharges of Bond and Cow Lamp Creeks (and, therefore, the <br />discharges of the Seneca [I Mine) have an insignificant impact on Fish Creek. <br />To summarize water quality in the Fish Creek basin, it appears that the Seneca II Mine has <br />little, if any, impact on Fish Creek. Water discharged from the mine is lost to surface <br />ponds, evapotranspiration and the alluvium as it flows through Twentymi le Perk. Dissolved <br />solids from mine discharges are diluted during the snowmelt runoff in March and April <br />15 <br />