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<br />ASSESSMENT SHEET <br /> <br />WATER QUALITY LEVELS (Con.) <br /> <br />Description of Area: <br /> <br />Riverside Stream Gage - Surface Flow <br /> <br />Virgin Valley Subevaluation Unit, Arizona, Nevada, Utah <br /> <br />Future Conditiona <br />P1cminll: Alternatives <br />Present Future I I <br />Conditiona Without 1 2 <br /> <br />(5-year average) <br /> <br />Unit <br /> <br />Parameters <br /> <br />---------- <br /> <br />Physical properties <br /> <br />Discharge - Average Annual cfs 266 266 270 278 <br />pH no. 7.7 7.7 7.7 7.7 <br />Suspended solids mgl1 2,450 2,450 2,450 2,450 <br />Water temperature .C 19.5 19.5 19.5 19.5 <br />Air temperature-July Mean) .C 31.9 31.9 31.9 31.9 <br />Electrical conductance mmho/cm 1,918 1,,918 1,918 1,918 <br /> <br />Chemical properties <br />Major cations <br /> Ca ++ (calcium) .mg/1 171 171 171 171 <br /> Mg++(magnesium) mgl1 60 60 60 60 <br /> Na + (sodium) mgl1 151 151 151 151 <br /> SAR (sodium absorption <br /> ratio) no. 2.5 2.5 2.5 2.5 <br /> ".-. <br />Major anions <br /> C1: (chloride) mg/1 205 205 205 205 <br /> S04 (sulfate) mg/1 578 578 578 578 <br /> HC03(bicarbonate) mg/1 157 157 157 157 <br /> DO (dissolved oxygen) mg/1 10 10 10 10 .-', <br /> ~ <br />Dissolved solids (total) mgl1 1,337 1,337 1,337 1,337 <br />Nitrogen compounds <br /> (nitrate) mg/1 0.3 0.3 0.3 0.3 <br /> (ammonia) mgl1 .08 .08 .08 .08 ~~ <br />Phosphorus (total) mg/1 .17 .17 .17 .17 <br /> (ortho) mg/1 <br />C01iforms. fecal MPN/100ml 712 712 712 712 <br />BOD (biological oxygen <br /> demand) mg/1 1.4 1.4 1.4 1.4 <br />------- -I~----------- (5-year average) <br />Virgin River ~.. Lake Meacr'- Total flow - Surface and ground water <br /> ---------- ---------------- <br /> Discharge - Average Annual cfs 285 285 284 284 <br /> Dissolved solids (totals) mg/1 1,516 1,515 1,467 1,389 <br />1/ From program area. <br /> A-10 <br /> ,,{\r.rE.'l <br /> \..! v l '" v <br />