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1993 Annual Hydrologic Report <br />Page 4 <br />site since siphoning began. Data pages SO-1&2 presents a full <br />suite analysis performed on samples collected at this site. The <br />sample analyzed in November 1992 was collected at a pool of water <br />nearing the discharge level of outfall 002 to look for potential <br />discharge problems with the water. Water confined in abandoned <br />portions of a mine can be exposed to fresh rock surfaces not <br />normally exposed. This contact may allow the water to dissolve <br />additional solids. As expected, this water had a higher TDS than <br />most of the locations monitored in the mine. Another expectation <br />of discharge from this site was that a reduction in TDS would be <br />manifested over time. In the water analysis shown on the data <br />pages it can be seen that the TDS has dropped 50$ over the year. <br />Substantial decreases were seen in Sodium, Sulfate, Calcium and <br />Chloride. This trend is slowing and expected to stabilize at <br />some TDS level between 1000 and 2000 MG/L. Table 593-5 is a <br />statistical summary of sampling since 1980. Diagrams 593-11 thru <br />13 were prepared to show a Lowess Smooth Plot through pH, TFe and <br />TDS information since 1980. The source of water for this <br />discharge point has varied over time, therefore information prior <br />to December 1992 may not be representative of future trends. <br />Diagram 593-14 is a trilinear representation of sampling this <br />year. The decrease in TDS mimics the decrease in the sulfate <br />proportion in the water. <br />Discharge point 003 was utilized for discharging water pumped out <br />of the old Cameo Mine and has not been used since 1979. There is <br />no new information for this site this year. <br />Discharge point 004 continued to be used all year to discharge <br />from the Cameo No. 1 Mine. Flow information is given in the Mine <br />Water section of this report. A listing of weekly monitoring <br />results is given on data pages SF-11 & 12 and result of the <br />annual full suite analysis is presented on data pages SP-1 & 2. <br />Table 593-6 is a statistical summary of water quality data <br />collected since 1980. Diagrams 593-15 thru 17 show Lowess Smooth <br />Plots through historic data on this site. The pH shows a wide <br />scatter of information but a general decreasing trend. The TFe <br />shows a relatively stable low level. The TSS shows a wide range <br />of values but a genera decreasing trend. The wide variation in <br />values is a function of the source of the water at the time of <br />discharge. The primary sources are the portal ramp underdrain <br />represented by location 1 for the Cameo Mine in the Mine Water <br />section, active area mine inflows and sealed area inflows at <br />location 8. Diagram 593-18 is a trilinear representation of the <br />mine water showing it to be a typical Na HCO3 type of mine water. <br />• New this year is the Whole Effluent Toxicity (WET) tests. This <br />testing was added to our CDPS permit requirements because of the <br />classification of the receiving waters. The acute test involves <br />