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<br />Mr. Marcus Middleton -3- <br /> <br />September 10, 1991 <br />Alluvial Wells <br />Fish Creek <br />Again, there is some evidence of <br />the drainage. Seepage from the <br />of elevated dissolved solids and <br />dai-.a is limited, I would suggest <br />impact from mining, however, at <br />to be significant. <br />Foidel Creek <br />Inspection of Figure 14 indicates an event <br />1986 which has caused the conductivity of <br />wells to increase approximately 507. since <br />anomaly is also evident in the surface wat <br />(Figure 34). Please attempt to identify t <br />spring, initiation of mine discharge or sc <br />help explain this phenomenon. Other than <br />iron and manganese, the overall quality is <br />increasing trends are apparent. <br />overall better quality higher in <br />Mine 2 spoils is the probable cause <br />sulfate in 006-AW-Z. Although the <br />that there is some evidence of <br />the present time it does not appear <br />taking place in July of <br />all Foidel Creek alluvial <br />that time. This apparent <br />er quality of site 8 <br />he development of a spoil <br />me other event that would <br />some high Fall values for <br />reasonable, and no <br />Spoil Wells <br />The spoil wells south of Foidel Creek exhibit elevated TDS, EC and <br />sulfate values beginning in the summer of 1986. These data indicate <br />the spoil aquifer as the possible source of dissolved solids in the <br />Foidel Creek alluvial wells. No definitive trend can be identified, <br />however, future monitoring may help define any increasing trend. <br />Spring and Fa11 testing may help to identify high manganese and iron <br />to be a seasonal phenomenon. <br />Surface Water <br />Sites 14, 800, 8, and 900 show somewhat elevated values with regard to <br />conductivity and/or dissolved solids and/or sulfate. Sites 700 and <br />301 are good quality sites, both of which receive little or no runoff <br />from CYCC mining activities. Site 1002 on Fish Creek and Site 69 on <br />Trout Creek are downstream of all CYCC Twentymile Park Mining <br />activities and, at this time, neither show emerging trends or elevated <br />readings leading toward material damage. <br />Spoil Springs <br />1. Cadmium and mercury values are mi;;ing for the September 1990 <br />sample. Please explain. <br />Spoil Spring C1 flowed 170 gpm in May, yet did not get a full suite <br />analysis. Please explain this discrepancy. <br />As expected, EC and dissolved solid values are high in many of the <br />spoil springs. Spring 114 historically is of poor quality but no <br />increasing trend is evident since its development. <br />