PERMFILE67693 - Laserfiche WebLink

Home Browse Search

• TABLE 2.05.6.(3)-4 Flow Rates vs. TDS for Spoil Waters and Receiving Streams • Irrigation - Sept/Oct No Irrigation- March/April #1 Mine Spoil Water (001 Discharge) TDS 1967 2885 #1 Mine Spoil Water (001 Discharge) Flow CFS .376 .041 Tuttle Draw #1 Mine Pre-Mix Point (SW-N3) TDS 1680 2094 Tuttle Draw #1 Mine Pre-Mix Point (SW-N3) Flow CFS 2.3 0.8 Tuttle Draw #1 Mine Post-Mix Point TDS(calculated) 1720 2133 Tuttle Draw #1 Mine Post-Mix Point Flow CFS (calculated) 2.676 0.841 #2 Mine Spoil Water TDS (4% above #1 Mine Levels) 2045 3000 #2 Mine Spoil Water Flow CFS (as estimated earlier) .570 .062 Tuttle Draw #2 Mine Pre-Mix Point TDS (same as #1 Mine Post-Mix) 1777 2192 Tuttle Draw #2 Mine Pre-Mix Point Flow CFS (same as #1 Mine Post-Mix) 3.246 0.903 Tuttle Draw #2 Mine Post-Mix Point TDS (calculated) 1817 2244 Tuttle Draw #2 Mine Post-Mix Point Flow CFS (calculated) 3.816 0.965 San Miguel River Pre-Mix Point TDS (Peabody Tab 17) 620 450 San Miguel River Pre-Mix Point Flow CFS (Peabody Tab 17) 141 817 San Miguel River Post-Mix Point TDS (calculated) 652 452 San Miguel River Post-Mix Point Flow CFS (calculated) 144.82 817.97 The values for the 001 Discharge and SW-N3 are averaged from measurements made from 1993 to present. Table 2.05.6(3)-3 shows this information for these as welt as other sample points. As is seen from the table, the spoil water inflows from both mine areas influence the quality of Tuttle Draw to a minor degree. However, within 4500 feet, this flow enters the San Miguel River where the flow is so much larger than the Tuttle Draw flow that the impact is negligible. During periods of irrigation, Tuttle Draw is flowing at a higher rate while the River is running low, which is the time of maximum impact of the flows. at this time, the increase in TDS of the River is from 620 to 652 ppm, or an increase of 5.1%. It should be noted that Tuttle Draw flows are always higher • REVISED MARCH 2006 2.05.6(3)-38