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<br /> 1974 Annual <br /> Annual Highest Lowest Mean <br /> Mean Monthly Monthly Dissolved 3.0 <br />Dissolved 29.4 36.4 13.5 <br /> (Apr.) (Aug.) <br /> 0.08 0.26 0.01 Suspended 0.07 <br />Suspended <br /> (Apr.) (Aug.) <br /> <br />The following tabulation of pool means gives the mag- <br />nesium hardness as mg/I CaC03 and mg/I Mg: <br />1974 <br />Highest <br />Monthly <br /> <br />Annual <br />Mean <br /> <br />Lowest <br />Monthly <br /> <br />mg/I CaC03 <br /> <br />66 104 32 <br /> (Apr.) (Aug,) <br />16 25 8 <br /> 1975 <br />Annual Highest Lowest <br />Mean Monthly Monthly <br />65 110 28 <br /> (Dec.) (June) <br />16 26 7 <br /> <br />mg/I Mg <br /> <br />mg/I CaC03 <br /> <br />mg/I Mg <br /> <br />The magnesium concentration (mg/l) in the suspended <br />fraction for each of the aforementioned categories in <br />the same order were as follows: <br /> <br />1974 1975 <br />mg/I Mg 0.21 0.37 0.05 0.11 0.34 0.03 <br />(Oct.) (June) (June) (Dec.) <br /> <br />No single month appears to consistently have either <br />highest or lowest means for either fraction. The annual <br />means were the same for the dissolved fraction, but <br />were much greater in the first year of filling (1974-75) <br />for the suspended fraction. The seasonal trend for mag- <br />nesium hardness in the pool closely resembled that for <br />total hardness (fig. 10). Again, no specific recommended <br />concentration maxima for various water uses could be <br />found for either dissolved or suspended magnesium. <br />From table 4 it appears that magnesium enrichment <br />has occurred in the suspended unloading sites of E and <br />F. More statistical study of the data in table 4 would <br />be necessary for verification. <br /> <br />Sodium. - The sodium concentration (mg/l) in the dis- <br />solved and suspended fractions of pool water for each <br />impoundment water year were tabulated as follows: <br /> <br /> 1975 <br /> Annual Highest Lowest <br /> Mean Monthly Monthly <br />Dissolved 22.6 30,6 11.2 <br /> (Feb.) (June) <br />Suspended 0,23 0.42 0.02 <br /> (Oct., Jul.) (June) <br /> <br /> <br />The 1974 data in the aforementioned tabulation are <br />skewed somewhat to higher values since sodium analy- <br />sis was begun in September 1974, and low values for <br />June, July, and August were not available. The monthly <br />changes in dissolved sodium for the inlet, outlet, and <br />pool are shown in figure 12. The levels of suspended <br />sodium in the reservoir pool were similar to those for <br />two permanent natural ponds on the Pawnee National <br />Grasslands [16]. No specific water qual ity criteria for <br />sodium could be found. The acceptable use levels for <br />sodium are usually considered under conductivity and <br />TDS. Significant sodium changes in the pool sediments <br />were not evident (table 4). <br /> <br />Potassium. - Seasonal fluctuations of dissolved potas- <br />sium were not as pronounced as for sodium, sulfate, <br />chloride, etc. (fig. 13). In fact, a seasonal trend of rel- <br />atively stable dissolved potassium concentrations were <br />especially evident for the reservoir pool. This same <br />condition of relatively uniform potassium concentra- <br />tions on a year-around basis has been reported by Hem <br />[3] and Herrmann [16]. Mean potassium concentra- <br />tions of the dissolved and suspended fractions of pool <br />water for various criteria are listed below: <br /> <br />Annual <br />Mean <br /> <br />Dissolved 3.3 <br /> <br />1974 <br />Highest Lowest <br />Monthly Monthly <br />4,0 2.6 <br />(Apr.) (May) <br />0.26 0,02 <br />(Apr.) (Nov.) <br />1975 <br />Highest Lowest <br />Monthly Monthly <br />3.6 0.9 <br />(Oct.) (June) <br />0.18 0.04 <br />(June) (Sept., Oct., <br /> Feb.) <br /> <br />Suspended <br /> <br />0.09 <br /> <br />25 <br />