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<br />OJ17oj <br /> <br />Table E shows the results from the low flow samples and compare to the historical data at 250 <br />cfs and 500 cfs for the sample site at the San Juan River above the confluence of the Animas <br />River in river segment 20,6.4.401. <br /> <br />TABLEE <br />Comparison of Water Quality data at San Juan River <br />above the confluence of the Animas River <br /> <br />Parameters San Juan River San Juan River- San Juan River- San Juan River - <br /> above historical low historical data for historical <br /> confluence of flow data (range average 500 cfs maximin data for <br /> Animas River- from 112 to 257 flows (range from 500 cfs flows <br /> low flow test cfs) 460 to 554 cfs) <br /> July 9-15, 2001 <br />average stream flow 219 199 (n=15) 502 (n=19) 554/460 <br />(efs) <br />Conductivity 557 617 (n=15) 638 (n=18) 1800/464 <br />(umhos/cm) <br /> , <br />water temp degrees 22.4 14.6 (n=13) 14.4 (n=17) 24.5/3 <br />Cent. <br />turbidity 40.5 <br />pH 7,82 7.9 (n=13) 7.9 (n=16) 8.4/7,2 <br />HC03 ion (mg/L) 151 132 (n=12) 143 (n=14) 275/118 <br />N03-N diss (mg/L) 0.3 0.4 (n=2) 0.7/0.1 <br />Calcium diss (mg/L) 62.5 56 (n=8) 63 (n=14) 120/52 <br />Magnesium diss 6.6 8,6 (n=8) 8.6 (n=14) 12/5.4 <br />(mg/L) <br />Sodium diss (mg/L) 44.6 44 (n=8) 65 (n=14) 270/35 <br />Potassium diss (mg/L) 2.2 2,3 (n=8) 2.9 (n=lO) 6.3/2 <br />Chloride total (mg/L) 5.0 6.5 (n=14) 5.9 (n=16) 15/3 <br />Sulfate S04 total 162.2 159 (n=8) 204 (n=13) 700/130 <br />(mg/L) <br />Arsenic diss (ug/L) 6,1 <br />Barium diss (ug/L) <br />Boron diss (ug/L) ND 43 (n=7) 57.5 (n=8) 130/30 <br />Cadmium diss (ug/L) <0.1 <br />Chromium diss (ug/L) <1.0 <br />Cobalt diss (ug/L) <br /> <br />Page 12 of 15 <br />