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• TABLE 2.05.6.(3)-4 <br />Flow Rates vs. TDS for Spoil Waters and Receiving Streams <br /> <br /> Irrigation - <br />Sept/Oct No Irrigation- <br />March/April <br />#1 Mine Spoil Water (001 Discharge) TDS 1967 2885 <br />#1 Mine Spoif Water (001 Discharge) Flow CFS .376 .041 <br />Tuttle Draw #1 Mine Pre-Mix Point (SW-N3) TDS 1680 2094 <br />Tuttle Draw #1 Mine Pre-Mix Point (SW-N3) Flow CFS 2.3 0.8 <br />Tuttle Draw #1 Mine Post-Mix Point TDS(calculated) 1720 2133 <br />Tuttle Draw #1 Mine Post-Mix Point Flow CFS (calculated) 2.676 0.841 <br />#2 Mine Spoil Water TDS (4% above #1 Mine Levels) 2045 3000 <br />#2 Mine Spoil Water Flow CFS (as estimated earlier) .570 .062 <br />Tuttle Draw #2 Mine Pre-Mix Point TDS (same as #1 Mine <br />Post-Mix) 1777 2192 <br />Tuttle Draw #2 Mine Pre-Mix Point Flow CFS (same as #1 <br />Mine Post-Mix) 3.246 0.903 <br />Tuttle Draw #2 Mine Post-Mix Point TDS (calculated) 1817 2244 <br />Tuttle Draw #2 Mine Post-Mix Point Flow CFS (calculated) 3.816 0.965 <br />San Miguel River Pre-Mix Point TDS (Peabody Tab 17) 620 450 <br />San Miguel River Pre-Mix Point Flow CFS (Peabody Tab 17) 141 817 <br />San Miguel River Post-Mix Point TDS {calculated) 652 452 <br />San Miguel River Post-Mix Point Flow CFS (calculated) 144.82 817.97 <br />The values for the 001 Discharge and SW-N3 are averaged from measurements made from 1993 to <br />present. Table 2.05.6(3)-3 shows this information for these as well as other sample points. <br />As is seen from the table, the spoil water inflows from both mine areas influence the quality of Tuttle <br />Draw to a minor degree. However, within 4500 feet, this flow enters the San Miguel River where the <br />flow is so much larger than the Tuttle Draw flow that the impact is negligible. During periods of <br />irrigation, Tuttle Draw is flowing at a higher rate while the River is running low, which is the time of <br />maximum impact of the flows. at this time, the increase in TDS of the River is from 620 to 652 ppm, or <br />an increase of 5.1 %. It should be noted that Tuttle Draw flows are always higher in TDS than the River, <br />regardless of the spoil springs, therefore, the impact from the spoil springs maybe only 2-3% increase <br />• (Revised 6/01) 2.05.6 (3) - 36 <br />