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<br />VII-19 <br /> <br /> <br /> TABLE VI I-G <br /> ALLOWABLE AMMONIA CONCENTRATIONS <br /> Stream Allowable <br /> Temp NH NH <br /> Station (CO) pH (mg/l) (mg/l) <br /> ~ <br />Rio Grande at Thi rty-mi Ie B ri dge 9 7.3 0.13 >2.0 <br />Rio Grande below Willow Creek 15 7.4 0.35 >2.0 <br />Rio Grande approx. 15 miles below Creede 16 7.4 0.07 >2.0 <br />Rio Grande at Gerrard Bri dge 17 7.2 <0.01 >2.0 <br />Rio Grande at Seven Mile Plaza 20 7.8 0.22 0.7 <br />Rio Grande north of Home Lake 12 7.5 2,0 >2.0 <br />Rio Grande below Alamosa Lagoons 23 7.6 0.38 1.2 <br />Rio Grande just above Conejos River 23 7.9 0.73 0.6 <br />, <br />Rio Grande at Lobatos Gaging Station 23 8.3 0.73 0.45 <br /> <br />problems along the Rio Grande with the Possible exception of the <br /> <br />The above tabulation demonstrates that there are no toxicity <br /> <br />area from the confluence with the Conejos River to the State line. <br /> <br />As illustrated in the tabulation, there is one sample at the loba- <br /> <br />indicate a Possible toxicity problem. Additional data should be <br /> <br />tos Gaging Station and one sample just above the Conejos River which <br /> <br />gathered at these locations during the monitoring and surveillance <br /> <br />icity problem should be studied in more detail. <br /> <br />program, which is recommended later in the report. The ammonia tox- <br /> <br />{~,'\ i~ '<' ,"', <br />'v',' (j"..v <br /> <br />~' c:~'..-_ "-::--':",_.;;;",>">\__.,-.~,,,,,~....,," ,_.__ <br /> <br />! <br />